JP6271268B2 - Electric blower and method for manufacturing the same - Google Patents

Description

  Embodiments described herein relate generally to an electric blower including a fan rotated by a rotor rotated by a stator, and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, for example, an electric blower used in a vacuum cleaner includes a rotor having a plurality of pairs of magnetic poles on the outer periphery, and a stator that has a pair of coils facing each other and generates a force for rotating the rotor. It has an electric motor (brushless motor) and a centrifugal fan integrally attached to the rotating shaft of the rotor, and rotates the rotor by switching the direction of the current flowing through the coil in accordance with the rotational position of the rotor.

  In such an electric blower, since the centrifugal fan is rotated at a high speed, it is necessary to firmly prevent the centrifugal fan from rotating with respect to the rotation shaft. At this time, for example, a method of press-fitting the centrifugal fan into the rotating shaft is also conceivable, but in this case, the rotational balance may be deteriorated due to minute deformation of the centrifugal fan, etc. A method of fixing with an adhesive is used.

  However, in this configuration, depending on the material of the rotating shaft and the centrifugal fan, it may be difficult to fix with an adhesive.

Special table 2012-518751 gazette

  The problem to be solved by the present invention is to provide an electric blower that can reliably prevent a fan from rotating about a rotating shaft without lowering the rotational balance, and a method for manufacturing the same.

The electric blower of the embodiment includes a rotor having a metal rotating shaft and an electric motor including a stator that generates a force for rotating the rotor. Furthermore, this electric blower has a resin fan that rotates by rotation of the rotating shaft. This fan includes a cylindrical fan body having an insertion hole that passes through a central portion and through which a rotation shaft is inserted. The fan is provided in the insertion hole along the axial direction of the fan main body, and includes a groove portion that communicates with one end side of the insertion hole and does not communicate with the other end side of the insertion hole. Then, the electric blower is formed of a resin material whose adhesion force to the metal constituting the rotation shaft is larger than the adhesion force to the resin constituting the fan, and is fixed to the outer peripheral surface of the rotation shaft and fitted into the groove portion. There is a rotation preventing portion that prevents the rotation shaft and the fan from rotating in the circumferential direction.

It is sectional drawing which shows a part of manufacturing method of the electric blower of one Embodiment, (a1) and (a2) show the whole rotor, (b1) and (b2) show the part expanded. (a) is sectional drawing which shows the fan of an electric blower same as the above, (b) is a front view which expands and shows a part of fan from the front. It is a disassembled perspective view of an electric blower same as the above. It is a center sectional view of an electric blower same as the above. (a) is a perspective view showing the same electric blower from the front, (b) is a perspective view showing the electric blower from the rear.

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

  4, 5 (a), and 5 (b), 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 is integrally provided with a brushless motor 12 that is an electric motor and a centrifugal fan 13 that is a fan rotated by the brushless motor 12. Hereinafter, for the sake of clarity, the brushless motor 12 side of the electric blower 11 will be described as the rear side (arrow RR side), and the centrifugal fan 13 side will be described as the front side (arrow FR side).

  As shown in FIGS. 3 to 5, the brushless motor 12 includes a rotor (rotor) 21, a stator (stator) 22 that generates a force for rotating the rotor 21, and detection for detecting the rotational position of the rotor 21. Part 23, control part 24 for controlling the force generated by stator 22, fixing member 25 for fixing stator 22 and detection part 23 while positioning, and stator 22 and detection part 23 are fixed via this fixing member 25 And a frame 26 which is a fixed member to be fixed.

  The rotor 21 includes a rotary shaft 28 that is an output shaft (shaft) to which the centrifugal fan 13 is attached on one end side (front end side), and a magnet that is integrally fixed to the other end side (rear end side) of the rotary shaft 28. And a bearing portion 30 that rotatably holds the rotary shaft 28 at a position on one end side (front end side) of the rotor main body 29.

  The rotating shaft 28 is formed in a long and narrow cylindrical shape from a metal such as stainless steel.

  The rotor body 29 is formed in a cylindrical shape, and is bonded and fixed to the rotary shaft 28, for example. A permanent magnet (not shown) is embedded in the rotor body 29, and approximately half of the outer periphery (approximately half of the circumference) is, for example, an N-pole (one) magnetic pole 29a, and the remaining approximately half (approximately half of the circumference) is S-pole ( The other magnetic pole 29b. That is, the rotor body 29 includes a pair of magnetic poles 29a and 29b having substantially the same size and different polarities adjacent to each other in the circumferential direction (rotating direction).

  The bearing portion 30 includes a cylindrical sleeve 32 fixed to the frame 26, and bearings 33 and 33 fixed to positions at both ends in the sleeve 32, and a rotation shaft is provided inside the bearings 33 and 33. 28 is inserted and held by these bearings 33 and 33.

  The stator 22 includes, for example, a stator core 35 formed of a magnetic material such as an electromagnetic steel plate, and an insulator 36 that is a stator insulation formed integrally with the stator core 35. The insulator 36 is a wire rod such as a copper wire. 37 is wound and configured.

  The stator core 35 is formed in a substantially U-shape (substantially C-shape) by connecting one end portions of one and the other core portions 41 and 42 forming a pair separated from each other by a connecting portion 43. One and other core tooth portions 45 and 46, which are one and other magnetic pole portions, are formed so as to be opposed to each other at the other end portion which is the free end portion side of the one and other core portions 41 and 42. Has been.

  These one and other core teeth 45, 46 have one and other magnetic action surfaces 54, 55 that are curved in an arc and face each other, and one and other slot openings 56, 57. Are spaced apart from each other.

  The one and other magnetic action surfaces 54 and 55 are portions for applying magnetism for rotating the rotor 21 to the rotor body 29 (magnetic poles 29a and 29b), and are applied to the outer peripheral surfaces (magnetic poles 29a and 29b) of the rotor body 29. Opposing via a predetermined gap. The one and other magnetic action surfaces 54 and 55 are arranged so that the positions of the arc centers are slightly shifted from each other.

  The insulator 36 is formed of, for example, a synthetic resin having excellent heat resistance, and one and other wound portions 63 and 64 disposed in one and other core portions 41 and 42 of the stator core 35, and an intermediate The holding portion 66 and the holding portion 67 are integrally provided, and an intermediate terminal 75 is attached to the intermediate holding portion 66 and a terminal portion 77 is attached to the holding portion 67. Then, the wire 37 is wound around the one and other wound parts 63 and 64 to constitute one and other coils 78 and 79 which are coils.

  These one and other coils 78 and 79 form electromagnets that generate magnetic poles having different polarities in one and other core teeth 45 and 46 (one and other magnetic action surfaces 54 and 55) of the stator core 35. The wire 37 is wound around one and other wound parts 63 and 64 in the same direction. Therefore, these one and other coils 78 and 79 are electrically connected in parallel between the terminal portion 77 and the intermediate terminal 75, and the winding start of the one coil 78 is the terminal portion 77 side and the other coil 79. The start of winding is the intermediate terminal 75 side.

  The detection unit 23 includes a substrate 81, position detection means 82 and temperature detection means 83 mounted on the substrate 81.

  The position detection means 82 detects the rotation position (rotation angle) of the rotor 21 by detecting the polarities of the magnetic poles 29a and 29b of the rotor body 29 of the rotor 21, and is, for example, a Hall IC. The position detecting means 82 is disposed to face one slot opening 56 of the stator core 35, and the one slot opening 56 faces the outer peripheral surface of the rotor body 29 of the rotor 21.

  The temperature detection means 83 detects the temperature of the stator 22 (one and other coils 78 and 79), and is, for example, a thermistor.

  The control unit 24 is electrically connected to the detection unit 23 and switches current direction and energization time to flow through one and other coils 78 and 79 according to the rotational position of the rotor 21 detected by the position detection means 82. The rotation speed of the rotor 21 is controlled by switching the energization time. In addition, when the temperature of the one and other coils 78 and 79 detected by the temperature detecting means 83 is equal to or higher than the predetermined temperature, the control unit 24 cuts off the current flowing through the one and other coils 78 and 79. Thus, the stator 22 (one and the other coils 78 and 79) has a function of protection means capable of protecting against overheating. The control unit 24 is fixed at a predetermined position other than the frame 26, for example.

  The fixing member 25 positions the detection unit 23 (substrate 81) and holds the stator 22 and detection unit 23 (substrate 81) with respect to the frame 26. It is formed in a long plate shape having substantially the same outline.

  The frame 26 is formed of, for example, synthetic resin, and includes a frame main body 103 that is a columnar fixed member main body, a cylindrical outer wall portion 104 that is positioned around the frame main body 103, and the frame main body. A rectifying unit 105, which is a plurality of rectifying fins, connecting 103 and the outer wall 104 is integrally provided.

  The frame main body 103 has a circular fitting receiving portion 107 into which the centrifugal fan 13 is fitted at one end, which is the front side, and a bearing portion 30 at the center of the fitting receiving portion 107. A holding hole 108 into which the (sleeve 32) is inserted and fixed is provided so as to penetrate between the front and rear ends. In addition, one and other boss portions 109 and 110 serving as one and other screw holes are projected from the other end side which is the rear side of the frame main body 103. These one and other bosses 109 and 110 are provided with screws 111 and 111, which are fixed bodies for fixing the stator 22 and the detection unit 23 (substrate 81) to the frame 26 together with the fixing member 25, from the rear of the shaft of the frame 26. It is inserted along the direction (front-rear direction) and screwed.

  The outer wall portion 104 is spaced from the outer peripheral surface of the frame main body 103 at substantially equal intervals over the entire circumference, and each rectification is performed between the inner peripheral surface of the outer wall portion 104 and the outer peripheral surface of the frame main body 103. A flow passage 113 in which the portion 105 is located is partitioned. The other end, which is the rear side of the flow passage 113, serves as an exhaust port 114 for discharging the air blown from the centrifugal fan 13 to the outside of the electric blower 11 (brushless motor 12).

  Each rectifying unit 105 rectifies air that is blown from the centrifugal fan 13 to the outer peripheral side and passes through the flow passage 113 from one end side to the other end side, and is formed in a rib shape and one end side Inclined along the circumferential direction of the frame 26 from the other end to the other end side.

  On the other hand, the centrifugal fan 13 is integrally fixed to the front end portion of the rotating shaft 28 of the brushless motor 12. The centrifugal fan 13 is formed of a synthetic resin having excellent heat resistance, dimensional stability, and wear resistance, such as PEEK, and is formed in a cylindrical shape that gradually increases in diameter from one end to the other end. The fan body 121 and a plurality of blade portions 122 protruding from the outer peripheral surface of the fan body 121 and spirally curved along the circumferential direction are integrally provided, and the air is centered by rotating in one direction. It is comprised so that it may rectify | straighten from the outer periphery side. The centrifugal fan 13 is covered with a cover portion 123 that is integrally fixed to the frame 26.

  The fan main body 121 is disposed in the fitting receiving portion 107 of the frame 26. Further, an insertion hole 125 through which the rotation shaft 28 is inserted and fixed is provided in the central portion of the fan main body 121. On the inner edge portion of the insertion hole 125, a longitudinal groove 125a that communicates with one end side (front end side) of the insertion hole 125 and does not communicate with the other end side (rear end side) of the fan body 121 (centrifugal fan 13). A plurality are formed along the axial direction and in the circumferential direction so as to be spaced apart from each other at substantially equal intervals (approximately equal angles). In addition, one end side (front end side) of the insertion hole 125 is a diameter-expanded portion 125b that gradually increases in diameter toward one end side.

  Each groove portion 125a is fitted with a rotation preventing portion 126 fixed to the outer peripheral surface of the rotary shaft 28. These anti-rotation portions 126 are formed by curing a fluid resin material 127 such as an epoxy resin, and the centrifugal fan 13 is pivoted with respect to the rotation shaft 28 by fitting into the groove portions 125a. It is designed to prevent slipping in the direction and to prevent rotation in the circumferential direction. In addition, as the resin material 127, a material whose adhesion force to the metal constituting the rotary shaft 28 is larger than the adhesion force to the synthetic resin constituting the fan body 121 (centrifugal fan 13) is used.

  The cover portion 123 is formed in a flat (short axial dimension) substantially cylindrical shape, and a circular suction port 128 is provided through the central portion, and the fan body 121 of the centrifugal fan 13 is provided in the suction port 128. Are inserted and arranged with a gap on the outer periphery. Further, the inner peripheral side of the cover portion 123 has a gap with respect to the outer peripheral side of the fan main body 121 of the centrifugal fan 13, and this gap communicates with the communication passage 129 that connects the suction port 128 and the flow passage 113. It has become.

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

  When manufacturing the electric blower 11, generally, the bearing 21, the rotor body 29, and the rotor 21 with the centrifugal fan 13 attached to the rotating shaft 28 are attached to the frame 26, and the separately assembled stator 22 and the detector 23 are provided. The fixing member 25 is attached to the frame 26, and the cover portion 123 is attached to the frame 26.

  More specifically, when assembling the rotor 21, the bearing portion 30 in which the bearings 33 and 33 are bonded and fixed inside the sleeve 32 is formed, for example, and the rotary shaft 28 is inserted into the bearings 33 and 33 of the bearing portion 30. For example, the rotor body 29 is bonded and fixed to the rear end side of the rotating shaft 28. Thereafter, the centrifugal fan 13 is inserted into the rotating shaft 28 from the front end portion with the insertion hole 125 aligned, and the centrifugal fan 13 is moved to the bearing portion 30 side which is the rear end side from the desired mounting position. For example, it is slid to a position where it abuts against the bearing portion 30 (sleeve 32) (FIGS. 1 (a1) and 1 (b1)), and a fluid resin material 127 is formed on the outer peripheral surface of the front end side of the rotary shaft 28. The centrifugal fan 13 is slid to the front end side of the rotary shaft 28 at a desired mounting position and pulled back (FIG. 1 (a2) and FIG. 1 (b2)) to face the outer peripheral surface of the rotary shaft 28. The resin material 127 enters the groove portions 125a of the fan main body 121 opened only on the front end side of the through-insertion holes 125 through the enlarged diameter portions 125b. In this state, these are attached to a jig (not shown) and held in an upright state, and the resin material 127 is cured, so that the resin material 127 is fixed to the outer peripheral surface of the rotary shaft 28 and each groove portion of the centrifugal fan 13 The anti-rotation portion 126 is fitted into the inner portion 125 a, and the centrifugal fan 13 is fixed to the rotating shaft 28 and fixed to the rotation shaft 28. In other words, this is equivalent to a state in which the centrifugal fan 13 is prevented from rotating by the rotation-preventing portion 126 protruding in the radial direction on the outer peripheral surface of the rotating shaft 28. At this time, the anti-rotation portion 126 may be fixed to each groove portion 125a of the centrifugal fan 13 (fan main body 121). The effect of can be sufficiently obtained.

  Further, when the stator 22 is assembled, the wire rod 37 is sequentially wound around one wound part 63 and the other wound part 64 of the insulator 36 integrally formed with the stator core 35, so that one coil 78 and the other are wound. The coil 79 is formed, the wire rod 37 is held by the intermediate holding part 66 and the holding part 67, and the intermediate terminal 75 and the terminal part 77 are press-fitted into the intermediate holding part 66 and the holding part 67, so that one and other coils The stator 22 is completed by electrically connecting 78 and 79 to the intermediate terminal 75 and the terminal portion 77.

  Thereafter, the completed rotor 21, stator 22 and the like are assembled to the frame 26. The rotor 21 is inserted into the holding hole 108 and bonded and fixed, and the cover 123 is bonded and fixed to the frame 26 so that the fan main body 121 is positioned at the fitting receiving portion 107 of the frame 26 and sucks in. The suction port 128 is connected to the flow passage 113 by the communication passage 129.

  Then, the stator 22 and the detection unit 23 are aligned and overlapped with the fixing member 25, and fixed to the frame 26 by screwing to one of the frame 26 and the other bosses 109, 110 using screws 111, 111. .

  In this state, the outer peripheral surface (magnetic poles 29a, 29b) of the rotor main body 29 of the rotor 21 is interposed between the one and other core teeth 45, 46 (one and the other magnetic action surfaces 54, 55) via a predetermined gap. Positioned so as to face the position detecting means 82.

  The electric blower 11 thus completed is assembled at a predetermined position and electrically connected with lead wires and the like to the intermediate terminal 75, the terminal portion 77, and the like, so that electric power is supplied and the electric blower 11 becomes rotatable.

  In the detection unit 23, the position detection means 82 detects the rotational position of the rotor 21, that is, the rotational position of the magnetic poles 29a and 29b, via the magnetic poles 29a and 29b. By switching the direction of the current flowing in the coils 78 and 79, the magnetic poles generated in the one and other core teeth 45 and 46 (one and the other magnetic action surfaces 54 and 55) are switched, and the rotor 21 is rotated.

  More specifically, the rotational position of the rotor 21 detected by the position detecting means 82 is such that, for example, the magnetic pole 29a faces one core tooth 45 (one magnetic action surface 54), and the magnetic pole 29b moves to the other core tooth 46. When the position is opposite to (the other magnetic acting surface 55), the same polarity (N pole) as that of the magnetic pole 29a is generated in one coil 78, and the same polarity (S pole) as that of the magnetic pole 29b is generated in the other coil 79. When the direction of the current flowing through the wire 37 is set by the control unit 24 so as to occur, between the one core tooth portion 45 (one magnetic acting surface 54) and the magnetic pole 29a, and the other core tooth portion 46 (other A repulsive force is generated between the magnetic acting surface 55) and the magnetic pole 29b, and between one core tooth 45 (one magnetic acting surface 54) and the magnetic pole 29b, and another core tooth 46 (other The attraction force is generated between the magnetic acting surface 55) and the magnetic pole 29a, so that the rotor 21 rotates about a half turn. Next, when the control unit 24 switches the direction of the current to the opposite direction, a magnetic pole opposite to the above is generated in one and the other coils 78 and 79, and the rotor 21 further rotates about a half turn to make a full turn. By repeating this operation, the rotor 21 can be continuously rotated in a certain direction.

  The rotation of the rotor 21 causes the centrifugal fan 13 fixed integrally with the rotation shaft 28 of the rotor 21 to rotate, so that negative pressure is generated and air is sucked from the suction port 128. This air flows from the communication passage 129 to the flow passage 113 while being rectified along each blade 122, and is rectified by each rectification portion 105 when passing through this flow passage 113 and cools the brushless motor 12, The air is exhausted from the exhaust port 114.

  The temperature detecting means 83 detects the temperatures of the one and other coils 78 and 79, that is, the temperature of the stator 22 through the stator core 35. Then, the control unit 24 determines whether or not the temperature is equal to or higher than a predetermined temperature. If the temperature is equal to or higher than the predetermined temperature, one coil 78 and / or another coil 79 is overheated. This control unit 24 reduces the current flowing through one and the other coils 78 and 79, thereby stopping the rotation of the rotor 21 and protecting the electric blower 11 (brushless motor 12).

  According to the embodiment described above, one end (front end) side of the rotary shaft 28 is inserted from the other end (rear end) side of the insertion hole 125 of the centrifugal fan 13 to connect the centrifugal fan 13 to the other end of the rotary shaft 28 ( Slide to the (rear end) side, and apply a curable liquid resin material 127 that adheres to the metal constituting the rotary shaft 28 to the outer peripheral surface of the rotary shaft 28 on one end (front end) side. 13 is slid toward one end (front end) of the rotating shaft 28 to allow the resin material 127 to enter the groove 125a and harden the resin material 127, thereby being fixed to the outer peripheral surface of the rotating shaft 28 and the insertion hole. Non-rotating portion that is fitted in a groove 125a that communicates with one end (front end) side of 125 and does not communicate with the other end (rear end) side of insertion hole 125 to prevent rotation of rotating shaft 28 and centrifugal fan 13 in the circumferential direction. 126 is formed. Accordingly, the centrifugal fan 13 is rotated by the rotation stop portion 126 without reducing the rotational balance by using an operation that may cause the centrifugal fan 13 or the rotary shaft 28 to be deformed, such as press-fitting the centrifugal fan 13 into the rotary shaft 28. It is possible to reliably prevent the shaft 28 from rotating.

  In particular, when the centrifugal fan 13 is formed of a synthetic resin such as PEEK, it is sufficient to be firmly fixed to the metal constituting the rotating shaft 28 and the synthetic resin constituting the centrifugal fan 13 (fan body 121). Since it is not easy to obtain an adhesive capable of obtaining a high detent strength at a low cost, the detent portions 126 that harden the resin material 127 that is firmly fixed to the rotating shaft 28 side and are fitted in the respective grooves 125a. It is made of synthetic resin that is difficult to adhere to metal with an adhesive without using a dedicated adhesive more expensive than necessary, regardless of the member (synthetic resin) constituting the centrifugal fan 13. The centrifugal fan 13 can be reliably and inexpensively prevented from rotating with respect to the rotary shaft 28.

  Moreover, since the electric blower used for the vacuum cleaner rotates at a high speed of about 1000 to 100,000 rpm, the electric blower 11 described above in which the centrifugal fan 13 is firmly prevented from rotating with respect to the rotation shaft 28 can be suitably used.

  In addition, the centrifugal fan 13 can be formed accurately and easily even if it has a complicated shape by molding with a synthetic resin, and the weight can be reduced as compared with the case of using a metal or the like. In particular, by using PEEK as the synthetic resin that constitutes the centrifugal fan 13, sufficient heat resistance is ensured against heat generated by air compression and friction and heat generated from the stator 22 side (coils 78 and 79). In addition, it is possible to manufacture the centrifugal fan 13 that is not easily worn and has good dimensional accuracy.

  Further, by providing the enlarged diameter portion 125b on one end side of the insertion hole 125, when the centrifugal fan 13 (fan main body 121) is slid to the one end side, the resin material 127 passes along the enlarged diameter portion 125b to each groove portion 125a. It is easily guided and easily enters these grooves 125a.

  In the above-described embodiment, the electric blower 11 uses the brushless motor 12 as an electric motor. However, a motor having a brush may be used. In this case, instead of the detection unit 23 and the control unit 24, the rotor is provided with a commutator that is in sliding contact with the coil and the brush, and the direction of the current flowing through the coil by switching is switched to switch the magnetic pole on the rotor side. By doing so, the same operational effects as those of the above-described embodiment can be obtained.

  Although one embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications 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
12 Brushless motor, an electric motor
13 Centrifugal fan
21 Rotor
22 Stator
28 Rotation axis
121 Fan body
125 insertion hole
125a groove
126 Non-rotating part
127 Resin material

Claims (3)

A rotor having a metal rotation shaft, and an electric motor including a stator that generates a force for rotating the rotor;
A cylindrical fan main body having an insertion hole through which the rotation shaft is inserted, and provided in the insertion hole along the axial direction of the fan main body, communicated with one end side of the insertion hole. In addition, a resin fan that includes a groove portion that does not communicate with the other end side of the insertion hole, and rotates by rotation of the rotating shaft;
The rotating shaft is formed by a resin material having a larger adhering force to the metal constituting the rotating shaft than the adhering force to the resin constituting the fan, and is fixed to the outer peripheral surface of the rotating shaft and fitted into the groove. An electric blower comprising: a rotation preventing portion that prevents the shaft and the fan from rotating in the circumferential direction. A plurality of grooves are provided apart from each other in the circumferential direction of the rotating shaft,
The resin material constituting the rotation preventing portion is fixed to the outer peripheral surface of the shaft even at a position between the groove portions, and is interposed between the outer peripheral surface and the insertion hole.
The electric blower according to claim 1, wherein: A rotor having a metal rotation shaft, a motor including a stator that generates a force for rotating the rotor, a cylindrical fan body having an insertion hole that passes through the central portion and through which the rotation shaft is inserted, and A fan that is provided inside the insertion hole, communicates with one end side of the insertion hole and does not communicate with the other end side of the insertion hole, and rotates with the rotation of the rotation shaft; and A method of manufacturing an electric blower comprising a rotation preventing portion that is fixed to an outer peripheral surface and fitted in the groove to prevent the rotation shaft and the fan from rotating at least in the circumferential direction,
Inserting one end side of the rotating shaft from the other end side of the insertion hole of the fan and sliding the fan to the other end side of the rotating shaft;
Applying a curable liquid resin material that adheres to the metal constituting the rotating shaft on the outer peripheral surface on one end side of the rotating shaft,
By sliding the fan to one end side of the rotating shaft, the resin material enters the groove,
The anti-rotation part is formed by curing the resin material. A method for manufacturing an electric blower, wherein:

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