JP2012117497A - Electric blower and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric blower capable of surely preventing an air leakage, restricting the manufacturing cost, and to provide a method of manufacturing the same.SOLUTION: The electric blower includes: a centrifugal fan which has a circular suction opening; a motor which rotates the centrifugal fan; a fan cover which has a circular intake opening to be connected to the suction opening and which is to be fitted to the motor so as to cover the centrifugal fan; and an annular seal member 92 which seals a connection part between the suction opening and the intake opening. The seal member 92 is formed into an annular shape by opening a sheet-like seal raw material 95, which has a slit 97 in a central part thereof and a pair of cut parts 98 in the outside thereof, outward from the slit 97, and by changing an outer peripheral side 95c and an inner peripheral side 95b with each other to deform so that the edge part of the cut part 98 is brought into pressure-contact to seal the cut part 98.

Description

  Embodiments described herein relate generally to an electric blower including an annular seal member that seals a connection portion between a suction port of a centrifugal fan and an intake port of a fan cover, and a manufacturing method thereof.

  Conventionally, for example, an electric blower used for a vacuum cleaner, an electric motor, a centrifugal fan connected to a rotating shaft of the electric motor, a rectifying plate positioned between the electric motor and the centrifugal fan, a centrifugal fan and a rectifying plate And a fan cover attached to the electric motor. A circular suction port is formed at the center of the centrifugal fan, and a circular suction port is formed at the center of the fan cover. An annular seal member that is in sliding contact with the edge of the suction port of the centrifugal fan is fixed around the intake port of the fan cover. This sealing member prevents the air blown from the centrifugal fan in the outer circumferential direction from circulating to the suction port (circulation flow) by airtightly connecting the suction port and the suction port.

JP-A-8-68392 JP 2000-257589 A

  When manufacturing a seal member, for example, as described in Patent Document 1, when a sheet-like seal material is cut out in an annular shape, useless edge material is generated in the seal material, which increases costs.

  Further, as described in Patent Document 1, when both ends of a stick-shaped seal material are combined into an annular shape, depending on the type of the seal material, it is not easy to bond both ends. Leakage may occur.

  In this regard, as described in Patent Document 2, a configuration in which a slit is formed in a seal material formed in a strip shape and opened in an annular shape can be considered, but in such a configuration, the inner diameter and the outer diameter of the seal member In order to absorb the dimensional difference, it is necessary to form a cutout on the outside, and air leakage may occur from the position of the cutout.

  This invention is made | formed in view of such a point, and it aims at providing the electric blower which can prevent an air leak reliably, and its manufacturing method, suppressing manufacturing cost.

  The electric blower of the embodiment has a centrifugal fan having a circular suction port. This electric blower has an electric motor that rotates a centrifugal fan. The electric blower has a circular intake port connected to the intake port, and has a fan cover that covers the centrifugal fan and is attached to the electric motor. Furthermore, this electric blower has an annular seal member that seals the connection portion between the suction port and the suction port. Then, the seal member is formed in a ring shape by opening a sheet-like seal material having a slit at the center and having a pair of cut portions on the outside from the slit, and the outer peripheral side and the inner peripheral side are switched. It is formed by deforming so as to close the cut portion by pressing the edge portion of the cut portion.

It is explanatory drawing which shows the manufacturing method of the sealing member of the electric blower of 1st Embodiment in order of (a) thru | or (e). It is a side view which expands and shows a part of electric blower same as the above. It is a side view which cuts out some electric blowers same as the above. It is explanatory drawing which shows the manufacturing method of the sealing member of the electric blower of 2nd Embodiment in order of (a) thru | or (e).

  The configuration of the first embodiment will be described below with reference to FIGS.

  In FIG. 3, 11 indicates an electric blower, and this electric blower 11 is used for, for example, a vacuum cleaner or a blower. The electric blower 11 includes an electric motor 13, a centrifugal fan 14 connected to the electric motor 13 and rotated, a diffuser 15 that is a rectifying plate positioned between the electric motor 13 and the centrifugal fan 14, and a centrifugal fan 14 and a substantially cylindrical fan cover 16 that covers a part of the diffuser 15, and the operation is controlled by control means (not shown). Hereinafter, for the sake of convenience, the description will be made with the electric motor 13 side as the lower side and the centrifugal fan 14 side (the fan cover 16 side) as the upper side.

  The electric motor 13 includes a motor main body portion 21 that is a main body portion, and a frame 22 as a body case that holds the motor main body portion 21.

  The motor main body 21 is a well-known inner rotor type in which, for example, a rotor 26 is arranged inside a rectangular frame-shaped stator 25, and in this embodiment, a commutator motor using a brush device 27 is used. For example, a brushless motor may be used.

  The stator 25 is also called a stator or a field, and a plurality of fixed magnetic poles are formed in the circumferential direction by a field winding 29.

  The rotor 26 is also called a rotor or an armature, that is, an armature. The rotor 26 has a commutator 32 that is in sliding contact with the brush device 27 on a rotating shaft 31 that is an output shaft serving as a center of rotation, and an electric current connected to the commutator 32. The armature core 33 is integrally formed as a rotor body that is connected to each other to form a rotating magnetic pole.

  The rotary shaft 31 has an upper end portion, which is one end portion in the axial direction, inserted into the diffuser 15, and the centrifugal fan 14 is connected to the upper end portion. The rotating shaft 31 is rotatably held at both ends by bearings 35 and 36, respectively.

  The frame 22 includes a first frame 41 having a substantially bottomed cylindrical shape and a second frame 42 disposed along the radial direction at the upper end of the first frame 41.

  The first frame 41 is formed of, for example, metal or synthetic resin, and holds the stator 25 therein. Further, on the lower end side of the first frame 41, brush attachment holes 44 to which the brush devices 27 are attached are formed at positions facing each other, and a plurality of positions are provided between the brush attachment holes 44. An exhaust port 45 is formed as an opening. Further, a motor head portion 46 that holds the bearing 35 is formed coaxially at the lower end portion of the first frame 41.

  The second frame 42 is formed of, for example, metal or synthetic resin, and both end portions are fixed to the upper end side of the first frame 41 via screws 51 along the radial direction. In addition, a bearing holding portion 52 that holds the bearing 36 on the inner side is formed at the center of the second frame 42 so as to protrude upward, and the outer side of the bearing holding portion 52 fixes the diffuser 15. It is a part to do.

  Each brush device 27 holds a prismatic carbon brush 54 that is electrically connected to a power source (not shown) so as to be movable inside, and the tip end side of the carbon brush 54 is pressed against the commutator 32. Are electrically connected.

  The centrifugal fan 14 rotates integrally with the rotating shaft 31, and is formed of a metal such as aluminum. The centrifugal fan 14 is a disk-shaped lower fan plate 56 that is a single fan plate (shroud), and faces the lower fan plate 56 substantially in parallel with a predetermined gap, and has a suction port 57 in the center. A disk-shaped upper fan plate 58, which is another fan plate (shroud) provided, and a plurality of fans that are spiral blades in plan view, sandwiched and fixed integrally between the fan plates 56, 58 It has wings 59.

  The lower fan plate 56 located on the electric motor 13 side has a round hole 61 formed in the center, and the upper end of the rotating shaft 31 inserted through the hole 61 is provided with washers 63 and 64 and nuts. It is integrally connected to the centrifugal fan 14 via 65. A cylindrical sleeve 67 for holding a gap is in contact with the lower side of the one washer 63.

  Further, the upper fan plate 58 is formed so as to protrude gradually from the peripheral edge portion toward the suction port 57, that is, toward the side away from the lower fan plate 56. That is, the peripheral edge 57a of the suction port 57 is formed in a cylindrical shape that protrudes upward on the fan cover 16 side.

  Further, each fan blade 59 extends from the outside of the suction port 57 so as to be curved in an arc shape over the vicinity of the peripheral edge of each fan plate 56, 58. Further, the fan blades 59 are arranged so that the surface directions thereof are substantially orthogonal to the fan plates 56 and 58, and are fixed integrally to the fan plates 56 and 58 by caulking, for example.

  The diffuser 15 rectifies the air blown from the centrifugal fan 14 to the outer peripheral side and guides it to the electric motor 13 side, and is located between the electric motor 13 and the centrifugal fan 14. Further, the diffuser 15 includes a diffuser body 75 as a rectifying plate body, a plurality of upstream blades 76 protruding upward from an upper surface which is one main surface of the diffuser body 75, and the other main surface of the diffuser body 75. A plurality of downstream blades 77 projecting downward from a certain lower surface are integrally provided. In the diffuser 15, the bearing holding portion 52 of the second frame 42 is inserted from below into a holding hole 78 formed in the center portion of the diffuser main body 75, and the second frame is inserted through a screw 79. It is fixed at 42.

  The fan cover 16 is press-molded with a metal such as a galvanized steel plate, and is press-fitted into the outer peripheral edge of the first frame 41 of the frame 22 of the electric motor 13. The fan cover 16 includes a cylindrical outer plate portion 81, an extension portion 82 that is a rectifying plate facing portion that extends from the upper end portion that is one end portion of the outer plate portion 81 to the center side, and the extension portion 82. The cover protrusion 83 as a stepped portion protruding in a step shape from the center side to the upper end side, and gradually protrudes upward from the upper end portion, which is one end portion of the cover protrusion 83, toward the center side. It has an inclined portion 84 that is a centrifugal fan facing portion formed so as to be integrated with a flat plate portion 85 as a wall portion that extends from the upper end portion that is one end portion of the inclined portion 84 to the center side, A cylindrical portion 86, which is a cylindrical burring portion, is integrally formed at the central portion of the flat plate portion 85, and an inner side of the cylindrical portion 86 is a round hole-like intake port 87. Note that the extended portion 82, the cover protruding portion 83, the inclined portion 84, and the flat plate portion 85 have a cover portion 88 that is continuous with the outer plate portion 81 and covers the upstream side (upper side) of the centrifugal fan 14 and the diffuser 15 of the fan cover 16. Is formed.

  The outer plate portion 81 constitutes the outermost periphery of the fan cover 16, is located outside the intake port 87, and the lower end portion is press-fitted and fixed to the outer edge portion of the first frame 41 of the frame 22.

  The extending portion 82 is located outside the intake port 87 and is formed in a planar shape along a direction intersecting (orthogonal) with respect to the axial direction of the fan cover 16 (outer plate portion 81), for example, the diffuser 15 The upper end blades 76 are pressed against each other to form a flow path between the upstream blades 76 and 76 adjacent to each other.

  The cover protruding portion 83 is a cylindrical portion formed coaxially with the outer plate portion 81, is located outside the air inlet 87, and has a slightly larger diameter than the centrifugal fan 14. The cover protruding portion 83 protrudes from the extending portion 82 in a direction away from the centrifugal fan 14 so as to avoid interference with the centrifugal fan 14.

  The inclined portion 84 is located outside the intake port 87 and is formed in a curved plate shape that is curved so that the inclination gradually increases from the cover protruding portion 83 side to the flat plate portion 85 side.

  The flat plate portion 85 constitutes the uppermost end of the fan cover 16, that is, is located on the opposite end of the fan cover 16 with respect to the centrifugal fan 14 (the frame 22 of the electric motor 13). And is formed in a planar shape along a direction intersecting (orthogonal) with respect to the axial direction of the fan cover 16.

  The cylindrical portion 86 is formed at the center of the flat plate portion 85 by, for example, burring, and protrudes downward, that is, to the centrifugal fan 14 side. Further, the cylindrical portion 86 is formed coaxially with the outer plate portion 81 and the cover protruding portion 83. Further, an annular seal member 92 is attached between the outer periphery of the cylindrical portion 86 and the flat plate portion 85.

  As shown in FIGS. 2 and 3, the sealing member 92 blocks the circulation flow of the air blown from the centrifugal fan 14 toward the outer peripheral direction to the suction port 57. Further, the seal member 92 is formed of a member that is softer than members constituting the centrifugal fan 14 and the fan cover 16 and has elasticity, heat resistance, and slipperiness (slidability). Specifically, for the seal member 92, for example, a seal material 95 (FIG. 1) formed of a material that does not generate (hardly generate) shavings such as PTFE (Poly-Tetra-Fluoro-Ethylene) is used. Further, the seal member 92 is formed in a quadrangular cross section, the entire inner peripheral surface 92a is in close contact with the outer periphery of the cylindrical portion 86, and is centrifuged on the (one) main surface 92b on the centrifugal fan 14 side (lower side). The fan 14 bites in, and the entire main surface 92c on the opposite side (upper side) (the other side) with respect to the centrifugal fan 14 is in close contact with the flat plate portion 85.

  The seal material 95 shown in FIG. 1 is formed in a strip sheet shape having a longitudinal dimension L1 that is about half the outer diameter of the seal member 92 and a width dimension L2 that is slightly larger than twice the width dimension w of the seal member 92. ing. Further, when the seal material 95 is formed in the seal member 92, a linear slit 97 is formed in the center portion, and a plurality of cut portions 98 are provided on the outer sides of both ends in the longitudinal direction. Formed in pairs.

  The seal material 95 is cut into a rectangular strip from a seal material formed into a larger sheet. Further, the slit 97 and the cut portion 98 may be formed simultaneously when the seal material 95 is cut out from a larger sheet-like seal material.

  The slit 97 is formed along the longitudinal direction of the seal material 95, and both end portions 97a, 97a of the slit 97 are separated from the both end portions 95a, 95a of the seal material 95 by the width dimension w of the seal member 92. The Further, the length of the slit 97 is about half the inner diameter of the seal member 92. Further, the slit 97 has a constant width dimension, and both end portions 97a and 97a are formed in a semicircular arc shape having a diameter of the width dimension to deform the seal material 95 into an annular shape. These end portions 97a, 97a are configured to suppress distortion. For this reason, the width dimension L2 of the seal material 95 is set to be approximately equal to the dimension obtained by adding the width dimension of the slit 97 to twice the width dimension w of the seal member 92.

  Each notch portion 98 is for absorbing distortion when the sealing material 95 is opened from the slit 97 in an annular shape, and the tip side is formed toward both end portions 97a, 97a of the slit 97, and the tip side is formed. It becomes a wedge shape (isosceles triangle shape) gradually becoming narrower. Further, the notches 98 are spaced apart from each other, and the distal end sides are spaced apart from both end portions 97a and 97a of the slit 97. Further, as the cut portion 98, for example, (first and second) side cut portions 98a and 98b located on both sides of both end portions 95a and 95a of the seal material 95, and both end portions 95a of the seal material 95, respectively. , 95a and the end cut portion 98c are set. The width dimension of these cut portions 98 (respective cut portions 98a to 98c) is the outer circumference of the strip seal-like seal material 95 and the outer diameter (outer circumference length) when the seal material 95 is formed into an annular shape. And the dimensional difference between the outer diameter and inner diameter (inner circumferential length) of the seal material 95 when this annular shape is used, in other words, the dimensional difference between the outer circumference and inner circumference of the seal member 92. Are set, and when the seal member 92 is formed, the inner edge portions are pressed against each other at the inner edge portions of the respective cut portions 98 (respective cut portions 98a to 98c), and gaps are formed. The seal member 92 is prevented from being distorted due to the pressing force acting more than necessary without being opened.

  The air inlet 87 of the fan cover 16 is airtightly connected to the air inlet 57 of the centrifugal fan 14 via the seal member 92.

  Next, the manufacturing method of the first embodiment will be described.

  First, a method for manufacturing the seal member 92 will be described. When manufacturing the seal member 92, a linear slit 97 is provided in the center portion along the longitudinal direction, and a plurality of cut portions 98 (respective cut portions 98a to 98c) are provided at both end portions 95a and 95a. A rectangular strip sheet-shaped sealing material 95 (FIG. 1A) is opened outward from the slit 97 to form an annular shape (FIG. 1B). In this state, on the outer periphery of the seal material 95, the notches 98 (the notches 98a to 98c) are opposed to each other, in other words, at two positions symmetrical with respect to the center of the annular seal material 95. The cut portion 98 (each cut portion 98a to 98c) absorbs distortion when the strip-shaped seal material 95 is deformed into an annular shape due to the narrow width of the cut portions. To do.

  Next, as shown in FIG. 1 (c), the entire inner peripheral side 95b (slit 97 side) and outer peripheral side 95c of the annular seal material 95 are flexibly deformed so as to be exchanged (inverted). At this time, as shown in FIG. 1 (d), the notches 98 (the notches 98a to 98c) are located on the inner peripheral side of the seal member 92, and the notches 98 (each notches). 98a to 98c) are opposed to each other by the dimensional difference between the inner diameter and the outer diameter, so that the notches 98 (the notches 98a to 98c) are closed without using an adhesive or the like. It becomes the closed part 99.

  When the electric blower 11 is assembled, the motor main body 21 is accommodated in the first frame 41, the lower end portion of the rotating shaft 31 is inserted and fixed in the bearing 35, and the second frame 42 is fixed to the first frame 41. The upper end side of the rotary shaft 31 is inserted and fixed to the bearing 36, and the brush device 27 is attached to the brush attachment hole 44 of the first frame 41.

  Further, the outer side of the bearing holding portion 52 of the second frame 42 is inserted into the holding hole portion 78 of the diffuser 15, the diffuser 15 is attached to the second frame 42, and fixed with screws 79.

  Further, the sleeve 67, the washer 63, the centrifugal fan 14, and the washer 64 are sequentially attached to the rotating shaft 31 protruding from the bearing holding portion 52, and these are connected and fixed to the rotating shaft 31 by the nut 65.

  On the other hand, a seal member 92 is attached to the outer periphery of the cylindrical portion 86 with respect to the fan cover 16 formed in advance by pressing or the like, and the outer plate portion 81 of the fan cover 16 is press-fitted into the first frame 41 and fixed. As a result, the peripheral edge portion 57a of the suction port 57 of the centrifugal fan 14 is pressed against the main surface 92b of the seal member 92.

  In this state, by rotating the centrifugal fan 14 appropriately, the peripheral portion 57a of the suction port 57 scrapes the seal member 92, and a groove portion 92d that is in close contact with the peripheral portion 57a is formed on the main surface 92b of the seal member 92. The peripheral portion 57a of the port 57 bites into the seal member 92, that is, the upper end portion of the peripheral portion 57a of the suction port 57 of the centrifugal fan 14 and the lower end portion of the intake port 87 (cylinder portion 86) of the fan cover 16 are in the axial direction. (The upper end portion of the peripheral portion 57a of the suction port 57 of the centrifugal fan 14 is located above the lower end portion of the intake port 87 (cylinder portion 86) of the fan cover 16), and the seal member 92 and the centrifugal fan 14 The peripheral edge 57a of the suction port 57 maintains a smooth sliding contact state, and the suction port 57 and the suction port 87 are connected in an airtight manner. Since the sealing member 92 is formed of a member that does not easily generate shavings, the shavings are not generated by the biting of the peripheral edge portion 57a of the centrifugal fan 14, and the groove 92d is not gradually expanded.

  When the electric motor 13 is driven, the centrifugal fan 14 connected to the rotary shaft 31 rotates to generate a negative pressure, and air is sucked into the centrifugal fan 14 through the intake port 87 and the intake port 57. Thereafter, the air guided by the fan blades 59 is blown from the centrifugal fan 14 toward the outer periphery, and flows toward the outer periphery of the diffuser 15 while being rectified by the upstream blade 76 of the diffuser 15. At this time, the peripheral portion 57a of the suction port 57 of the centrifugal fan 14 bites into the main surface 92b of the seal member 92, and the airtightness of the connection portion between the suction port 57 and the suction port 87 is maintained. The air blown toward the outer peripheral direction from the space between the upper fan plate 58 of the centrifugal fan 14 and the fan cover 16 where the pressure is relatively high, to the suction port 57 where the pressure is relatively low. Prevent circulation.

  As described above, according to the first embodiment, the sealing member 92 has a strip-like shape having the linear slit 97 at the center and the notches 98 on the outer sides of both ends 95a and 95a. The sealing material 95 is opened outward from the slit 97 to form an annular shape, and the outer peripheral side 95c and the inner peripheral side 95b are interchanged so that the edge of the cut portion 98 is pressed and deformed so as to close the cut portion 98. By forming in this way, the material removal of the seal material 95 from the larger seal material becomes better, and the manufacturing cost can be further reduced.

  Next, a second embodiment will be described with reference to FIG. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the second embodiment, the sealing member 92 of the first embodiment is formed from a cross-shaped sealing material 101.

  That is, the seal material 101 shown in FIG. 4 is formed in a cross sheet shape in which linear material portions 102, 102, 102, 102 having a longitudinal dimension L5 and a width dimension L6 are continuous with each other. Further, when the seal material 101 is formed on the seal member 92, a cross-shaped slit 103 is formed at the center portion, and a plurality of cut portions 104 are formed on the outside of each material portion 102. Formed.

  The seal material 101 is cut out in a cross shape from a seal material formed into a larger sheet shape. Further, the slit 103 and the cut portion 104 may be formed simultaneously when the seal material 101 is cut out from a larger sheet-like seal material.

  The longitudinal dimension L5 of each material portion 102 is set to about 1/8 of the outer diameter of the seal member 92. Further, the width dimension L6 of each material portion 102 is set to be slightly larger than twice the width dimension w of the seal member 92.

  The slit 103 is formed along the center of each material portion 102, 102, 102, 102 of the seal material 101, and is substantially orthogonal to the center portion of the seal material 101. The end portions 103a, 103a, 103a, 103a of the slit 103 are separated from the tip portions 102a, 102a, 102a, 102a of the material portions 102 of the seal material 101 by the width dimension w of the seal member 92. . Further, the overall length of the slit 103 is about half the inner diameter of the seal member 92. Further, the slit 103 has a constant width dimension L7, and each end 103a, 103a, 103a, 103a is formed in an arc shape having a diameter of the width dimension L7, so that the seal material 101 is formed. It is configured to suppress distortion at these end portions 103a, 103a, 103a, 103a when deformed into an annular shape. Therefore, the width dimension L6 of each material portion 102 of the seal material 101 is set to be approximately equal to the dimension obtained by adding the width dimension of the slit 103 to twice the width dimension w of the seal member 92. Further, in this slit 103, intersecting portions 103b, 103b, 103b, 103b located at the base ends of the respective material portions 102 are formed in a ¼ arc shape. Therefore, the inner sides of the base end portions 102 b, 102 b, 102 b, 102 b of the material portions 102, 102, 102, 102 are bent in a ¼ arc shape that is convex toward the center side of the seal material 101.

  Each notch 104 is for absorbing distortion when the sealing material 101 is opened from the slit 103 in an annular shape, and the front end side is formed toward each end 103a, 103a, 103a, 103a of the slit 103. It has a wedge shape (isosceles triangle shape) that gradually becomes narrower toward the tip side. In addition, the notches 104 are spaced apart from each other, and the distal ends are spaced from the ends 103a, 103a, 103a, 103a of the slit 103. Further, as the cut portion 104, for example, (first and second) sides respectively located on both sides of the respective tip portions 102a, 102a, 102a, 102a of the respective material portions 102, 102, 102, 102 of the seal material 101 A part cut part 104a, 104b and an end part cut part 104c located at each tip part 102a, 102a, 102a, 102a of each material part 102, 102, 102, 102 of the seal material 101 are set. The width dimension of these cut portions 104 (the respective cut portions 104a to 104c) is the outer circumference of the strip seal-like seal material 101 and the outer diameter (outer circumference length) when the seal material 101 is formed into an annular shape. And the dimensional difference between the outer diameter and inner diameter (inner circumferential length) of the sealing material 101 when this annular shape is used, in other words, the dimensional difference between the outer circumference and inner circumference of the seal member 92. Is set.

  Next, the manufacturing method of the said 2nd Embodiment is demonstrated.

  When manufacturing the seal member 92, a cross-shaped slit 103 is provided in the central portion along each material portion 102, and a plurality of notches 104 (each notches 104a to 104c) are provided on each material portion 102. A rectangular strip sheet-like seal material 101 (FIG. 4A) respectively provided at the distal end portion 102a is formed in an annular shape by opening the base end portion 102b of each material portion 102 outward from the slit 103 (FIG. 4B). )). In this state, on the outer periphery of the seal material 101, the cut portions 104 (the respective cut portions 104a to 104c) are located at positions opposed to each other, in other words, at four positions symmetrical with respect to the center of the annular seal material 101. The cut portions 104 (the respective cut portions 104a to 104c) absorb the distortion when the cross-sheet-shaped seal material 101 is deformed into an annular shape because the width dimensions thereof are narrowed. To do.

  Next, as shown in FIG. 4C, the entire inner peripheral side 101a and outer peripheral side 101b of the annular seal material 101 are flexibly deformed so as to be interchanged. At this time, as shown in FIG. 4 (d), the cut portions 104 (the cut portions 104a to 104c) are respectively positioned on the inner peripheral side of the seal member 92, and the cut portions 104 (the cut portions 104). 104a to 104c) are opposed to each other by the dimensional difference between the inner diameter and the outer diameter, so that the incisions 104 (the incisions 104a to 104c) are closed without using an adhesive or the like. It becomes the closed part 105.

  Hereinafter, by assembling the electric blower 11 in the same manner as in the first embodiment, the main surface 92b of the seal member 92 is formed with a groove portion 92d that is in close contact with the peripheral portion 57a, and the peripheral portion 57a of the suction port 57 is the seal member. 92, i.e., the upper end of the peripheral edge 57a of the suction port 57 of the centrifugal fan 14 and the lower end of the suction port 87 (tubular portion 86) of the fan cover 16 are wrapped in the axial direction (suction of the centrifugal fan 14). The upper end portion of the peripheral portion 57a of the port 57 is located above the lower end portion of the intake port 87 (cylinder portion 86) of the fan cover 16), and the peripheral portion 57a of the suction port 57 of the centrifugal fan 14 is The smooth sliding contact state is maintained, and the suction port 57 and the suction port 87 are airtightly connected.

  As described above, according to the second embodiment, the cross member having the sealing member 92, the cross-shaped slit 103 at the center, and the notch 104 on the outside of the front end portion 102a of each material portion 102, respectively. The sealing material 101 is opened outward from the slit 103 to form an annular shape, and the outer peripheral side 101b and the inner peripheral side 101a are interchanged so that the edge of the cut portion 104 is pressed to close the cut portion 104. By forming by deforming, the bent shape inside the base end part 102b of each convex material part 102 toward the center side of the seal material 101 is opened, the seal material 101 is opened from the slit 103 in an annular shape, and the outer periphery By replacing the side 101b and the inner peripheral side 101a, the outer peripheral side of the seal member 92 can be obtained. Therefore, since the portion bent in advance before deforming the seal material 101 is made to correspond to the portion bent in a state where the seal material 101 is deformed to be the seal member 92, the seal material 101 is It is easier to form an annular shape, and distortion when the seal material 101 is deformed to form the seal member 92 can be more effectively suppressed.

  According to each of the embodiments described above, the strip member 92 of the electric blower 11 has a linear slit 97 at the center and a pair of cut portions 98 on both sides 95a and 95a. From the slits 97 and 103, a sheet-shaped seal material 95 or a cross-shaped seal material 101 having a cross-shaped slit 103 at the center and a cut-out portion 104 outside the tip end portion 102a of each material portion 102 is provided. Open to the outside to make an annular shape, and replace the outer peripheral side 95c, 101b with the inner peripheral side 95b, 101a to press the edges of the notches 98, 104 and close the notches 98, 104 To form. For this reason, compared with the case where the seal member is hollowed out from a larger seal material, for example, the material of the seal materials 95 and 101 is better, and wasteful end materials are less likely to be produced. The cost can be reduced, and the notches 98 and 104 are effectively formed by the difference between the outer circumference and the inner circumference by replacing the outer circumference side 95c and 101b of the annular seal material 95 and 101 with the inner circumference side 95b and 101a. Thus, air leakage from the notches 98 and 104 can be reliably prevented.

  In particular, the inner edges of the cut portions 98 and 104 that absorb distortion when the strip-shaped or cross-shaped sealing materials 95 and 101 are made into an annular shape are not bonded due to the difference in dimensions between the outer periphery and the inner periphery. Since these notches 98 and 104 can be closed by pressure contact, it is possible to use PTFE which is not easily bonded as a material constituting the seal material 95 and 101, and the functionality of PTFE makes it airtight and slidable. Therefore, it is possible to configure the seal member 92 with good.

  In each of the above embodiments, the outer sides of both end portions 95a and 95a of the seal material 95 or the outer sides of the tip portions 102a, 102a, 102a and 102a of the respective material portions 102, 102, 102 and 102 of the seal material 101 are provided. Alternatively, it may be formed in a semicircular arc shape so that no protruding portion is formed on the inner peripheral side of the seal member 92 when the seal member 92 is manufactured from the seal materials 95 and 101.

  Moreover, although some embodiment of this invention was described, these embodiment is 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.

11 Electric blower
13 Electric motor
14 Centrifugal fan
16 Fan cover
57 Suction port
87 Air intake
92 Seal material
95, 101 Seal material
97, 103 slit
98, 104 notch

Claims (6)

A centrifugal fan having a circular suction port;
An electric motor that rotates the centrifugal fan;
A fan cover that has a circular inlet connected to the inlet and covers the centrifugal fan and is attached to the motor;
An annular seal member for sealing a connection portion between the suction port and the suction port;
The sealing member is formed in a ring shape by opening a sheet-like sealing material having a slit at the center and having a pair of cut portions on the outside from the slit, and the outer peripheral side and the inner peripheral side are switched. An electric blower characterized in that the electric blower is formed by press-contacting an edge portion of the cut portion so as to close the cut portion. The sealing member has a slit-shaped sealing material having a slit in the center and a cut portion on each outer side of both ends, and is formed in an annular shape by opening outward from the slit, and the outer peripheral side and the inner peripheral side are switched. The electric blower according to claim 1, wherein the electric blower is formed by press-contacting an edge portion of the cut portion so as to close the cut portion. The seal member is formed in a circular shape by opening a cross-sheet-like seal material having a cross-shaped slit in the center and a cut portion on the outside of each end outward from the slit, and has an outer periphery and an inner periphery. The electric blower according to claim 1, wherein the electric blower is formed by changing the sides and bringing the edges of the cut portions into pressure contact so as to close the cut portions. A centrifugal fan having a circular suction port, an electric motor for rotating the centrifugal fan, a circular suction port connected to the suction port, and a fan cover attached to the electric motor so as to cover the centrifugal fan And a manufacturing method of an electric blower comprising a seal member that seals a connection portion between the suction port and the suction port,
A slit is formed in the center of the sheet-like seal material, and a notch that forms a pair on the outside of the seal material is formed.
The sealing material is opened outward from the slit to form an annular shape,
The seal member is formed by changing the outer peripheral side and the inner peripheral side of the seal material so as to press-contact the edge of the cut portion so as to close the cut portion. A method for manufacturing a blower. While forming a slit in the center of the strip-shaped seal material, and forming cuts on the outside of both ends of this seal material,
The sealing material is opened outward from the slit to form an annular shape,
The seal member is formed by changing the outer peripheral side and the inner peripheral side of the sealing material so as to press-contact the edge of the cut portion so as to close the cut portion. Item 5. A method for manufacturing an electric blower according to Item 4. A cross-shaped slit is formed at the center of the cross-sheet-shaped seal material, and a notch is formed outside each end of the seal material,
The sealing material is opened outward from the slit to form an annular shape,
The seal member is formed by changing the outer peripheral side and the inner peripheral side of the sealing material so as to press-contact the edge of the cut portion so as to close the cut portion. Item 5. A method for manufacturing an electric blower according to Item 4.

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