JP2011080427A - Electric blower and vacuum cleaner using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve blasting efficiency by reducing channel loss while maintaining cooling performances of a rotor part, a stator par, and the like. <P>SOLUTION: This electric blower 101 includes an impeller 112 driven and rotated by an electric motor 102 constituted of a bracket 105 covering a rotor part 103 and a stator 104, and a first air guide 115 constructing a plurality of channels 114 around the impeller 112 by a plurality of tongues 113 and a base part 118, and cools the rotor part 103 and the stator part 104 by supplying part of air flowing in through an inlet 126 of a first fan case 122 to the inside of the bracket 105. In the electric blower 101, a plurality of hole parts 128 are provided at an upper surface part of the bracket 105, a second air guide 131 including a plurality of tongues 129 and a bracket inlet 139 provided in a radial direction of the bracket 105 are provided, and bent parts 116, 119, 133, 134 are provided at an outer circumference side of the first and the second air guide 115, 131 and the base part 118, 132 sides. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric blower and a vacuum cleaner.

  Conventionally, as this type of electric blower, as shown in FIG. 7, an electric motor 4 constituted by a rotor portion 1, a stator portion 2 and a bracket 3 covering them, an impeller 5 that is rotationally driven by the electric motor 4, and this Around the impeller 5, a plurality of flow paths 7 are provided by a plurality of tongs 6. By gradually reducing the flow velocity of the air discharged from the impeller 5, the dynamic pressure is made static while suppressing the sudden expansion loss. An air guide 8 for converting and recovering pressure, an air inlet 9 in the center, a fan case 10 containing the impeller 5 and the air guide 8, and air passing through the air guide 8, the stator portion 2 and the bracket 3 is provided with a communication path 11 for smoothly guiding the stator portion 2 and the like, for example, to cool the stator portion 2 (see, for example, Patent Document 1).

  In addition, as shown in FIG. 8, the annular body 24 is provided in contact with and sealed in a gap in the vicinity of the outer periphery of the fan case 21 and the tongue 23 of the air guide 22, and the exhaust gas is exhausted to the outer periphery of the fan case 21. A port 25 is provided, and a part of the air flowing in from the intake port 26 is provided on the upper surface portion 28 of the bracket 27 through the lower portion of the air guide 22 as indicated by air flows A, B, C1, and C2. Some are supplied into the bracket 27 through the communication port 29 to cool the rotor portion 30 and the stator portion 31, and the remaining air is exhausted to the outside through the exhaust port 25 (see, for example, Patent Document 2).

  Further, as shown in FIG. 9, the air guide 41 is a pipe-shaped flow path 42, and the air that flows out of the flow path 42 is provided in the upper surface 44 of the bracket 43 as indicated by the air flow D. Some are supplied to the inside of the bracket 43 through 45 and cool the rotor portion 46 and the stator portion 47 (see, for example, Patent Document 3).

JP-A-62-70697 JP 2006-250016 A JP 2007-278154 A

  However, in the configuration of the conventional electric blower as shown in FIG. 7 above, it is possible to reduce the bending loss due to the air flow bent in a substantially right angle shown by the air flows B, C1, and C2 in FIG. 7, since the length of the flow path 7 of the air guide 8 is short and the flow velocity is not sufficiently slow, the air flows into the communication path 11 having a large flow path cross-sectional area. End up. Also, if the length of the flow path 7 is increased and air is to be supplied to the communication path 11 after the flow velocity is sufficiently slow, the air guide 8 needs to be considerably enlarged in the radial direction. It had the subject that the apparatus which can be limited was restricted.

Further, in the configuration of the conventional electric blower as shown in FIG. 8, the fan case 21 and the tongue 23 of the air guide 22 are abutted and sealed via the annular body 24, so that the flow path 22 a in the air guide 22 is formed. By making them independent of each other, leakage loss due to air flowing back and forth between the flow paths 22a while the flow velocity is high is prevented, and further, the exhaust port 25 prevents cooling of the rotor portion 30 and the stator portion 31. In addition, since it is possible to exhaust an excessive amount of air to the outside as shown by the air flow D, it is possible to reduce a substantially right-angle bending loss in the air flows B, C1, and C2. When used in a device with a different total flow rate of air flowing through the flow path, if the exhaust port 25 is not redesigned, bending loss and wall friction loss in the air flows B, C1, and C2 are increased. Since more performance may be significantly reduced, it has been difficult sharing in various devices.

  Further, since the exhaust port 25 is provided in the straight portion 32 where the annular body 24 ends, the flow exhausted from the exhaust port 25 as shown by the air flow D is bent sharply, so that the loss is reduced. As a result, there was a problem that exhaust could not be performed smoothly and air turbulence occurred.

  Furthermore, the air guide 41 of the conventional electric blower shown in FIG. 9 can greatly reduce sudden expansion loss, bending loss, leakage loss, etc., but in the air flow D when passing through the communication port 45 There was a problem that bending loss occurs and molding is difficult.

  The present invention solves the above-mentioned conventional problems, and while maintaining the cooling performance of the rotor part, the stator part, etc., the electric blower that improves the air blowing efficiency by reducing the flow path loss and the electric device using the same The purpose is to provide a vacuum cleaner.

  In order to solve the above-described conventional problems, an electric blower of the present invention includes a rotor portion, a stator portion, an electric motor configured by a bracket covering them, an impeller that is rotationally driven by the electric motor, a plurality of tongues, and a base portion The first air guide that forms a plurality of flow paths around the impeller, and a first fan case that has an air inlet in the center and that contains the impeller and the first air guide. In the electric blower that cools the rotor portion and the stator portion by supplying at least a part of the air flowing in from the intake port into the bracket, a plurality of holes are formed in the bracket in the axial direction of the bracket. And a second air guide having a plurality of tongues and a base portion, and a second fan case containing the second air guide; A bracket inlet provided in a radial direction of the bracket, and a bent portion is provided on each outer peripheral side and the base portion side of the first air guide and the second air guide; While maintaining sufficient cooling performance for the stator portion, the bending loss can be reduced by reducing the portion of the first air guide and the second air guide where the flow path is bent sharply, and the first air guide and the second air guide can be reduced. Since the flow path length of the two air guides can be increased, it is possible to gradually increase the cross-sectional area of the flow path. Since the flow rate can be sufficiently slowed, the sudden expansion loss can be reduced, and the blowing efficiency of the electric blower can be improved.

  Moreover, the vacuum cleaner of this invention has the electric blower of any one of Claims 1-6, and is very practical thing with high ventilation efficiency and strong suction power.

  The electric blower of the present invention is provided with a plurality of holes on the upper surface of the bracket and a second air guide downstream thereof, and a bent portion on the outer peripheral side and the base side of the first air guide and the second air guide. By providing at least a part of the air flowing in from the intake port to the bracket through the first air guide and cooling the rotor part and the stator part, etc., while maintaining sufficient cooling performance, A vacuum cleaner having excellent suction performance can be provided by reducing bending loss, sudden expansion loss, and the like and having excellent blowing efficiency, and using the electric blower for the vacuum cleaner.

Front view of electric blower in Embodiment 1 of the present invention A perspective view of a first air guide of the electric blower The perspective view of the bracket of the electric blower, the first air guide, and the second air guide Bottom view of the first air guide Half sectional view of electric blower in Embodiment 2 of the present invention Whole structure figure of the vacuum cleaner in Embodiment 3 of this invention Half sectional view of a conventional electric blower Half sectional view of another form of conventional electric blower Half sectional view of another form of conventional electric blower

  According to a first aspect of the present invention, there are provided a plurality of flow paths around the impeller by an electric motor constituted by a rotor part, a stator part and a bracket covering them, an impeller that is rotationally driven by the electric motor, and a plurality of tongues and a base part. And a first fan case having a suction port in the center and containing the impeller and the first air guide, and at least one of the air flowing in from the suction port In the electric blower that cools the rotor portion and the stator portion by supplying a portion into the bracket, a plurality of holes are provided in the upper surface portion of the bracket in the axial direction of the bracket, and a plurality of tongues are provided. A second air guide having a base portion, a second fan case containing the second air guide, and a bra provided in a radial direction of the bracket And a bent portion on the outer peripheral side and the base portion side of each of the first air guide and the second air guide, and sufficient cooling performance for the rotor portion and the stator portion. The bending loss can be reduced by reducing the portion where the flow path bends sharply in the first air guide and the second air guide, while the first air guide and the second air guide are combined. Since the path length can be increased, it is possible to gradually increase the flow path cross-sectional area, so that the air flow rate can be sufficiently slowed without abruptly increasing the flow path cross-sectional area. By being able to do so, the sudden expansion loss can be reduced, and the blowing efficiency of the electric blower can be improved.

  In the second invention, in particular, a straight portion is provided in a part of the second air guide of the first invention. The straight portion is provided in a portion where the flow velocity is high immediately after being discharged from the impeller, and the flow velocity is low. Then, by bending the air flow in the axial direction by the bent portion, it is possible to reduce the bending loss when the air flow is bent in the axial direction, and to improve the blowing efficiency.

  In the third aspect of the invention, the impeller of the first or second aspect of the invention is a mixed flow fan, and is discharged from the impeller toward the axial direction of the motor, so that the air flow is bent in the axial direction. Bending loss can be reduced, and air blowing efficiency can be improved. In addition, since the second air guide is configured to take in air for cooling the rotor portion and the stator portion from the bracket inlet, the length of the electric blower can be suppressed even if a mixed flow fan is used. It is possible to avoid an increase in the size in the axial direction.

  In the fourth invention, in particular, a plurality of vent holes are provided in the base portion of the first air guide of any one of the first to third inventions, and the air that has passed through the vent holes is supplied into the bracket. Thus, the rotor portion and the stator portion are cooled, and the rotor portion and the stator portion can be cooled also from the intake port side, so that the cooling performance can be improved.

  In particular, the fifth invention is the electric blower according to the fourth invention, wherein a plurality of guide blades are provided downstream of the plurality of vents and integrally with the base portion of the first air guide. Immediately after passing through the vent hole of the first air guide, air turbulence due to the rapid expansion of the cross-sectional area of the flow path can be reduced, so that the air blowing efficiency can be improved.

  In the sixth invention, in particular, when the total opening area of the plurality of holes of the fourth or fifth invention is S1, and the total opening area of the plurality of vent holes is S2, the holes are set so that S1> S2. Since the flow rate passing through the intake port side in the bracket having a large pressure loss can be reduced, the air blowing efficiency can be increased. Moreover, since the rotor part and the stator part are cooled by the air that has passed through the second air guide, the cooling performance for the rotor part and the stator part can be sufficiently ensured.

  A vacuum cleaner according to a seventh aspect of the invention has the electric blower according to any one of claims 1 to 6, and obtains an extremely practical vacuum cleaner having high blowing efficiency and strong suction force. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a half sectional view of an electric blower according to Embodiment 1 of the present invention, FIG. 2 is a perspective view of a first air guide of the electric blower, and FIG. 3 is a bracket and first air of the electric blower. FIG. 4 is a perspective view of the guide and the second air guide, and FIG. 4 is a bottom view of the first air guide.

  As shown in FIG. 1, the electric motor 102 is arrange | positioned at the electric blower 101 in this Embodiment. The electric motor 102 is a type of motor called a brush motor, and includes a rotor part 103, a stator part 104, a bracket 105 and a brush part 106 covering them, and the brush part 106 is located below the rotor part 103 and the stator part 104. Is provided. The rotor part 103 is provided with a rotating shaft 107, a commutator part 108, and coil parts 109a and 109b, and the stator part 104 is also provided with coil parts 111a and 111b. The impeller 112 is connected by the rotating shaft 107.

  In addition, around the impeller 112, a first air guide 115 that constitutes a plurality of flow paths 114 by a plurality of tongs 113 as shown in FIG. Further, as shown in FIG. 1, the tongue 113 of the first air guide 115 is provided with a bent portion 116 on the outer peripheral side and a straight portion 117 on the inner peripheral side. The base portion 118 is provided with a bent portion 119 and a straight portion 120. The base portion 118 of the first air guide 115 is provided with a plurality of vent holes 121 and communicates with the back side of the first air guide 115.

  The impeller 112 and the first air guide 115 are contained in the first fan case 122. The first fan case 122 is also provided with a case bent portion 123 and a case straight portion 124 so that the bent portion 116 of the tongue 113 of the first air guide 115 and the straight portion 117 are in contact with each other with almost no gap. Yes. A fan case spacer 125 is molded integrally with the first fan case 122. The fan spacer 125 is sealed against the impeller 112 at the intake port 126 so that the air flowing out of the impeller 112 does not flow into the impeller 112 again from the intake port 126. In this embodiment, the fan case spacer 125 is formed integrally with the first fan case 122. However, a gap through which air leaks between the fan case spacer 125 and the first fan case 122 is used. As long as the structure does not occur, both may be integrally formed by welding or adhesion.

A plurality of holes 128 corresponding to the respective flow paths 114 of the first air guide 115 are provided on the outer peripheral side of the upper surface 127 of the bracket 105, and as shown in FIG. 3 on the downstream side of the holes 128. In addition, a second air guide 131 in which a plurality of flow paths 130 corresponding to the holes 128 provided in the upper surface portion 127 of the bracket 105 is formed by the plurality of tongs 129 is provided. Here, the total opening area of the plurality of holes 128 provided in the upper surface portion 127 of the bracket 105 is S1, and the total opening area of the plurality of vent holes 121 provided in the base portion 118 of the first air guide 115 is S2. The hole 128 and the vent 121 are provided so that S1> S2. Further, bent portions 133 and 134 are provided on the outer peripheral sides of the base portion 132 of the second air guide 131 and the tongue 129 of the second air guide 131, respectively, and as shown in FIG. The flow path is gently bent in the radial direction.

  A second fan case 135 is provided so as to cover the second air guide 131, and the second fan case 135 is provided on the outer peripheral side of the tongue 129 of the second air guide 131. A case bent portion 136 is provided so as to follow the bent portion 134. The second fan case 135 is fixed to the bracket 105 by fastening together with the brush portion 106 with a screw 137.

  The side surface 138 of the bracket 105 downstream of the flow path 130 in the second air guide 131 is configured with a plurality of holes opened in a direction along the flow of the flow path 130 in the second air guide 131. A bracket inlet 139 is provided. Further, a confluence area 140 is provided between the tongue 129 provided in the second air guide 131 and the side surface portion 138 of the bracket 105, and the air that has passed through the respective flow paths 130 once merges here. It has become.

  Further, the bracket inlet 139 is provided in the vicinity of the lower coil 109b of the rotor part 103, the lower coil 111b of the stator part 104, and the brush part 106, and the air flowing in from the bracket inlet 139 The rotor portion 103, the stator portion 104, and the brush portion 106 are cooled by contacting the lower portion coil 109 b of the rotor portion 103, the lower portion coil 111 b of the stator portion 104, and the brush portion 106. .

  The bottom surface portion 141 of the bracket 105 is provided with a bracket exhaust port 142 so that the air flowing into the bracket 105 is exhausted to the outside after the rotor portion 103, the stator portion 104, and the brush portion 106 are cooled. ing. In the present embodiment, the bracket exhaust port 142 is provided on the bottom surface portion 141 of the bracket 105, but may be provided on the side surface portion 138 of the bracket 105 as long as the rotor portion 103 and the like can be cooled.

  Further, a through-hole 143 is provided on the inner peripheral side of the upper surface portion 127 of the bracket 105, and the air that has passed through the vent 121 provided in the base portion 118 of the first air guide 115 is the through-hole 143. It passes through the bracket 105 and passes through.

  About the electric blower in this Embodiment comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the electric blower 101 is activated, the rotor portion 103 of the electric motor 102 is rotated, and accordingly, the rotating shaft 107 and the impeller 112 are rotated. As a result, air is sucked from the intake port 126. Then, the air sucked from the inlet 126 by the impeller 112 flows into the flow path 114 in the first air guide 115. Here, by providing the tongue 113 such that the channel cross-sectional area of the channel 114 gradually increases as it goes downstream, the tongs 113 can be operated while suppressing a sudden expansion loss caused by a sudden increase in the channel cross-sectional area. The pressure recovery to convert the pressure into static pressure is possible.

The air that has flowed into the flow path 114 in the first air guide 115 flows into the bent portion 116 and the base portion 118 provided on the outer periphery of the tongue 113 of the first air guide 115 as indicated by the air flow G. The bent portion 119 is bent in the axial direction. As described above, since the air can be smoothly bent in the direction of the rotating shaft 107 without bending the air suddenly by the bent portions 116 and 119, the bending loss is small and the air blowing efficiency is high.

  Furthermore, since the tongue 113 and the base 118 of the first air guide 115 are provided with the straight portions 117 and 120, the air having a high flow velocity immediately after being discharged from the impeller 112 is bent in the direction of the rotary shaft 107. By not having such a configuration, the bending loss is reduced.

  A part of the air flowing into the flow path 114 in the first air guide 115 passes through the vent 121 provided in the base portion 118 of the first air guide 115 as indicated by the air flow H. As shown by the air flow I, the remaining air flows from the side of the through-hole 143 inside the bracket 105, passes through the hole 128 provided in the upper surface portion 127 of the bracket 105, and enters the second air guide 131. It flows into the flow path 130.

  The air that has passed through the vent 121 provided in the base portion 118 of the first air guide 115 flows into the back side of the first air guide 115 and is provided in the bracket 105 as indicated by the air flow J. By flowing into the bracket 105 through the through-hole 143, the upper coil portions 109a and 111a of the rotor portion 103 and the stator portion 104 are cooled from the upper side, that is, the intake port 126 side.

  Here, as shown in the bottom view of the first air guide 115 shown in FIG. 4, when the plurality of guide blades 144 are provided integrally with the base portion 118 of the first air guide 115, the air passage 121 has passed through. When the air flows into the back side of the first air guide 115, the air turbulence caused by the rapid expansion of the cross-sectional area of the flow path can be reduced, so that the blowing efficiency can be further improved.

  The air that has flowed into the flow path 130 in the second air guide 131 is further pressure-recovered and enters the merge area 140 when the flow velocity is sufficiently slow, and the air that has passed through each flow path 130 once merges. To do. Here, since the second air guide 131 and the second fan case 135 are provided with the bent portions 133 and 134 and the case bent portion 136, as shown by the air flow I, the rotating shaft 107 gently. Since it is possible to change the direction from the direction to the radial direction, it is possible to reduce the turbulence of the flow caused by the sudden bending of the flow path, that is, the bending loss.

  Then, air enters the bracket 105 through the bracket inlet 139 provided in the side surface portion 138 of the bracket 105, and the lower coil portion 109b of the rotor portion 103, and the lower coil portion 111b of the stator portion 104, Each part is cooled by the airflow hitting the brush part 106.

  As described above, the upper coil portions 109a and 111a of the rotor portion 103 and the stator portion 104 are connected to the ventilation port 121 provided in the first air guide 115 and the through-hole 143 provided in the bracket 105. The coil portions 109b and 111b and the brush portion 106 on the lower side of the rotor portion 103 and the stator portion 104 are respectively cooled by the flows H and J, and the hole portion 128 provided in the upper surface portion 127 of the bracket 105 and the second portion Since cooling can be performed by the air flows I and K passing through the flow path 130 in the air guide 131 and the bracket inlet 139 provided in the side surface 138 of the bracket 105, the structure has a high cooling effect. .

Further, the upper coil portions 109a and 1 of the rotor portion 103 and the stator portion 104, respectively.
Since air flows H and J for cooling 11a from above pass through a narrow space such as the gap between the rotor portion 103 and the stator portion 104 and the gap between the stator portion 104 and the bracket 105, pressure loss is reduced. Although large, in the present embodiment, since the hole 128 and the vent 121 are provided so that the relationship between the total opening area S1 of the hole 128 and the total opening area S2 of the vent 121 is S1> S2, Air flows H and J for cooling the upper coil portions 109a and 111a of the rotor portion 103 and the stator portion 104 from above are passed through the vent 121, and the flow rates of the air flow H and J are passed through the hole portion 128 and the rotor portion 103 and stator. By reducing the lower coil portions 109b and 111b of the portion 104 from the air flows I and K for cooling from the side of the bracket 105, the pressure is reduced. Reduce the flow rate of air passing through the large flow path losses, to enhance the blowing efficiency.

  Note that the upper coil portion 109a and the lower coil portion 109b of the rotor portion 103 and the upper coil portion 111a and the lower coil portion 111b of the stator portion 104 are connected to each other, and therefore supplied to the electric blower 101. Even when the flow rate of the air flows H and J for cooling the upper coil portions 109a and 111a of the rotor portion 103 and the stator portion 104 from the upper side is greatly reduced, As long as the air flows I and K for cooling the lower coil portions 109b and 111b of the stator portion 104 from the side of the bracket 105 are sufficiently secured, the rotor portion 103 and the stator portion are transferred by heat transfer. Since the upper coil portions 109a and 111a of the 104 are also cooled, a cooling capacity capable of handling various flow rates is ensured. It can be.

  Here, the bracket air inlet 139 is opened obliquely with respect to the side surface portion 138 of the bracket 105 so as to follow the direction of the air flow through the flow path 130 in the second air guide 131, whereby the second air Since air can be smoothly fed into the bracket 105 from the guide 131, collision loss to the side surface portion 138 of the bracket 105 in the vicinity of the bracket inlet 139 can be reduced.

  Of the coil portions that generate heat when energized, the lower coil portions 109b and 111b are directly blown, or the brush portion 106 that generates heat due to sliding friction with the commutator portion 108 is disposed below the stator portion 104. It is not only for improving the cooling effect that the air is directly applied to the air. That is, since the second air guide 131 can take a length in the direction of the rotation shaft 107, the length of the flow path 130 of the second air guide 131 is increased, and the flow path 130 of the second air guide 131 is increased. Since the cross-sectional area of the flow path 130 can be gradually increased without sufficiently increasing the cross-sectional area of the air flow, the flow velocity of the air can be sufficiently slowed. This is also because the bending loss can be reduced.

  Furthermore, even when the shape and position of the bracket inlet 139 are uneven or the gap inside the bracket 105 is narrow, the air that has passed through each flow path 130 is once merged in the merge area 140. Therefore, wall friction loss due to the occurrence of a place where the flow velocity is fast and a place where the flow velocity is slow can be reduced.

  In the present embodiment, since the total flow path length of the first air guide 115 and the second air guide 131 can be taken long, the air flow through each flow path is sufficiently slow when the flow velocity is sufficiently slow. Since the flows are mixed, the rapid expansion loss due to the rapid expansion of the cross-sectional area of the flow path can be suppressed.

As described above, the electric blower 101 according to the present embodiment ensures the cooling performance for the rotor portion 103 and the stator portion 104 and increases various pressure losses even if the total flow rate of the air flowing from the intake port 126 changes. The flow rate range that can be used is wide,
It can be shared with various devices.

  As described above, in the present embodiment, the plurality of holes 128 and the second air guide 131 are provided downstream of the upper surface portion 127 of the bracket 105, and the first air guide 115 and the second air guide are provided. The bent portions 116 and 119 and the bent portions 133 and 134 are provided on the outer peripheral side and the base portion side of the 131, respectively, and at least a part of the air flowing in from the air inlet 126 passes through the second air guide 131 to the bracket 105. By supplying and cooling the rotor part 103, the stator part 104, etc., it is possible to reduce bending loss and expansion loss while maintaining sufficient cooling performance, and to improve the blowing efficiency of the electric blower .

(Embodiment 2)
FIG. 5 is a half sectional view of the electric blower according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the electric blower in the said Embodiment 1, and the description is abbreviate | omitted.

  The electric blower 200 according to the present embodiment differs from that according to the first embodiment in that the discharge direction M of the impeller 201 is a mixed flow fan that is inclined in the axial direction of the rotating shaft 107, and the first air guide 202. The straight portions 205 and 206 provided on the outer peripheral side of the tongue 203 and the base portion 204 of the first air guide 202 are inclined in the axial direction of the rotary shaft 107 corresponding to the discharge direction M of the impeller 201. Is a point. Others are the same as those in the first embodiment.

  In the present embodiment, since the impeller 201 is a mixed flow fan and the discharge direction M is inclined in the axial direction of the rotating shaft 107, the angle at which the air flowing through the first air guide 202 is bent in the axial direction is Compared to the case of using the centrifugal fan as in the first embodiment described above, it can be made smaller, so it is possible to reduce the bending loss that occurs when the flow direction is changed, and to increase the blowing efficiency. it can.

  Further, as in the conventional electric blower shown in FIG. 8, the rotor portion 30 and the stator portion 31 are cooled only by the air passing through the lower portion of the air guide 22, and even when a mixed flow fan is used, As in the embodiment, it is possible to reduce the bending loss of the bent portion indicated by the air flow A by inclining the air guide 22, but the lower portion of the air guide 22 cannot be sufficiently removed. It is necessary to enlarge the blower in the axial direction. However, in the present embodiment, even if the lower portion of the first air guide 202 and the vent 121 become narrow, the rotor portion 103 and the stator portion 104 are cooled by the flow of air passing through the second air guide 131. Therefore, the cooling performance can be ensured while the electric blower 200 is downsized.

(Embodiment 3)
FIG. 6 shows a vacuum cleaner according to Embodiment 3 of the present invention. In addition, the same code | symbol is provided to the same part as the electric blower in the said embodiment, and the description is abbreviate | omitted.

  In FIG. 6, the vacuum cleaner 301 in this embodiment has a hose 302, an extension pipe 303, and a suction tool 304 that sucks dust by moving on the floor surface. The electric blower 101 (or 200) described in the first and second embodiments is incorporated.

As described in the first and second embodiments, the electric blower 101 (or 200) operates with high blowing efficiency while ensuring the cooling performance for the rotor portion 103 and the stator portion 104. By incorporating the vacuum cleaner body 306 into the vacuum cleaner main body 306, it is possible to provide a vacuum cleaner capable of obtaining a strong suction force while operating with high blowing efficiency, and is extremely practical.

  As described above, the electric blower according to the present invention and the electric vacuum cleaner using the electric blower are provided with the plurality of holes on the bracket upper surface and the second air guide downstream thereof, and the first air guide and the first air guide. Bending portions are provided on the outer peripheral side and the base portion side of the air guide of No. 2, and at least a part of the air flowing in from the intake port is supplied to the bracket through the second air guide to cool the rotor portion, the stator portion, etc. By adopting a configuration, it is possible to reduce bending loss and sudden expansion loss while maintaining sufficient cooling performance, and to improve air blowing efficiency and suction power. It is also applicable to.

101, 200 Electric blower 102 Electric motor 103 Rotor part 104 Stator part 105 Bracket 112, 201 Impeller 113, 129, 203 Tongue 114, 130 Flow path 115, 202 First air guide 116, 119, 133, 134 Bent part 117, 120 , 205, 206 Straight part 118, 132, 204 Base part 121 Vent 122 122 First fan case 126 Air inlet 127 Upper surface part 128 Hole part 131 Second air guide 139 Bracket inlet 140 Confluence area 144 Guide vane

Claims (7)

The rotor portion, the stator portion, and an electric motor constituted by a bracket covering them, an impeller that is rotationally driven by the electric motor, and a plurality of tongues and a base portion constitute a plurality of flow paths around the impeller. An air guide and a first fan case having a suction port in the center and containing the impeller and the first air guide, wherein at least a part of the air flowing from the suction port is placed in the bracket In the electric blower for supplying and cooling the rotor portion and the stator portion, a second hole having a plurality of holes in the upper surface portion of the bracket and a plurality of tongues and a base portion in the axial direction of the bracket. A second fan case containing the second air guide, and a bracket inlet provided in the radial direction of the bracket. For example, the first air guide with the respective outer peripheral side of the electric blower and the bent portion is provided on the base portion side of the second air guide. The electric blower according to claim 1, wherein a linear portion is provided in a part of the second air guide. The electric blower according to claim 1 or 2, wherein the impeller is a mixed flow fan. The rotor part and the stator part are any one of Claims 1-3 which provide a some ventilation hole in the base part of a 1st air guide, supply the air which passed the said ventilation hole in a bracket, and cool a rotor part and a stator part. The electric blower described in the item. The electric blower according to claim 4, wherein the plurality of guide blades are provided downstream of the plurality of vent holes and integrally with a base portion of the first air guide. The said hole and said ventilation hole were provided so that it might become S1> S2 when the total opening area of a some hole is S1 and the total opening area of a some ventilation hole is S2. Electric blower. The vacuum cleaner which has an electric blower of any one of Claims 1-6.