JP2013032711A - Electric blower, and vacuum cleaner using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric blower that blows air with high efficiency and rotates at a high speed, and to provide a vacuum cleaner using the same.SOLUTION: An impeller 120 includes upper and lower parts. An upstream upper impeller 121 is formed of aluminum which is a metal of high thermal conductivity. An uneven surface, such as a groove 173 and a rib 175, is provided on a blade 152 of the upper impeller 121. A downstream lower impeller 122 is formed of resin having high shape flexibility. An inlet port 195 of the impeller 120 and a suction port 194 of a fan case 192 are sealed in a contact manner. As a result, the high blowing efficiency is achieved, while preventing a resin component from being deformed or damaged due to sliding frictional heat in a seal part even at a high rotation speed.

Description

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

  Conventionally, as this type of electric blower, as shown in FIG. 14, an electric motor 2 having a rotating shaft 1, an impeller 4 fixed to the rotating shaft 1 by a nut 3 and driven to rotate by the electric motor 2, and discharged from the impeller 4 There are air guides 5 for converting the energy of the flow velocity of the generated air into energy of pressure, and the fan case 6 containing the impeller 4 and the air guide 5.

  Details of the impeller 4 will be described with reference to FIG. The impeller 4 includes a sheet metal rear shroud 11, a sheet metal front shroud 12 spaced apart from the rear shroud 11, and a plurality of sheet metal blades 13 sandwiched between the pair of shrouds 11 and 12. , And a resin inducer 15 provided corresponding to the air inlet 14 provided in the center of the front shroud 12. The sheet metal blade 13 is attached to the shrouds 11 and 12 by caulking. The resin inducer 15 is composed of a substantially conical hub 16 and a blade portion 17 formed on the hub 16, and in particular, to rectify the air flowing from the intake port 14 to the sheet metal blade 13 side, The shape of the blade portion 17 is a shape having a three-dimensional curved surface.

  FIGS. 16A and 16B show the mold structure of the inducer 15. In order to create the inducer 15 having such a complicated shape, resin molding is performed using a side slide mold 21 that slides radially toward the outer periphery of the inducer blade portion 17. The molding die is composed of the same number of side slide molds 21, cores 22, and cavities 23 as the blade portions 17 (see, for example, Patent Document 1).

  As shown in FIG. 17, an impeller 31 made of a resin material is divided into a rear shroud 32 and a front shroud 33 in units of blades, and a rear blade 34 is provided on the rear shroud 32 and a front side shroud 33 is provided on the front side. There is also a configuration in which the blades 35 are integrated, and the shrouds facing each blade are joined by ultrasonic welding, thereby making it possible to form the entire surface of each blade into a complicated shape that matches the flow of air (for example, Patent Document 2).

  Further, as shown in FIGS. 18A and 18B, the front shroud 41 and the rear shroud 42 made of a metal material are provided with projection holes 43 and 44 and made of a resin material having a three-dimensional curved surface. The blade 45 is provided with projections 46 and 47, and the projections 46 and 47 are press-fitted into the projection holes 43 and 44 so as to be integrated with the front shroud 41 and the rear shroud 42, or the projections 46 and 47 are integrated with the projection holes 43 and 44. There is also a configuration in which the protrusions 46 and 47 protruding from the protrusion holes 43 and 44 are melted and integrated with the front shroud 41 and the rear shroud 42 after being inserted into the protrusion 44 (see, for example, Patent Document 3).

Further, as shown in FIGS. 19 (a) and 19 (b), a plurality of sheets having an inlet 51 in the center, a resin front shroud 52, a resin rear shroud 53, and a three-dimensional curved shape. And a fan case 57 having a suction port 56 at the center and covering the impeller 55, on the suction port 51 side of the front shroud 52. A heat-resistant wear-resistant part 58 such as a metal ring provided at the end and a resin seal part 59 provided at the end on the suction port 56 side of the fan case 57 come into contact with each other. 51 and the suction port 56 of the fan case 57 have a contact-type seal structure, so that the air discharged from the impeller 55 is prevented from returning to the inside of the impeller 55 from the intake port 51 again to increase the blowing efficiency and By forming one of the seal configurations of the type with resin and the other with a material having heat resistance and wear resistance such as metal, the resin front shroud 52 is deformed or damaged by sliding frictional heat of the seal portion. There is also a configuration in which this is not possible (see, for example, Patent Document 4).

JP 2000-45993 A JP-A-11-107990 JP-A-7-127597 JP-A-10-141279

  However, in Patent Document 1, since the blade is made of sheet metal and is attached to the front shroud and the rear shroud by caulking, it is difficult to form a complicated three-dimensional curved surface shape such as a twist shape. Since only the resin-made inducer portion can be configured with a complicated three-dimensional curved surface shape adapted to the flow of the airflow, there is a problem that the shape is largely limited.

  Further, in the conventional configuration shown in FIG. 17, it is possible to make the entire blade surface in a complicated shape according to the flow of the air flow by making all the blades made of resin. When the fan case suction port and the impeller suction port have a contact seal structure as shown in FIG. 19A, the resin front shroud is deformed by sliding frictional heat at the seal portion. Since there is a possibility of breakage or the like, there is a problem that a non-contact type seal configuration is unavoidable, and thus it is not possible to prevent the return loss of air discharged from the impeller from the inlet of the impeller again. It was.

  18 (a) and 18 (b), the blade is made of resin, so that the entire surface of the blade can be made into a complicated shape in accordance with the flow of airflow. By making the shroud metal, the front shroud will not be deformed or damaged by the sliding frictional heat of the seal part even if it is a contact type seal configuration, but the metal front face only by the resin protrusion Since it is held by the shroud and the rear shroud, when used in an electric blower with a high rotational speed, the sliding frictional heat of the seal part increases, and the heat is transmitted through the metal front shroud and melts the resin protrusion. As a result, there has been a problem that the blade is detached from the front shroud.

  Further, in the conventional configuration shown in FIGS. 19 (a) and 19 (b), the blade is made of resin, so that the entire surface of the blade can be made into a complicated shape in accordance with the flow of the airflow, and further, contact By configuring one of the seal configurations of the resin with a material having heat resistance and wear resistance such as a metal, the resin front shroud may be deformed or damaged by the sliding frictional heat of the seal part. However, the air flow does not hit the heat-resistant and wear-resistant part, so when used in an electric blower with a high rotational speed, the sliding frictional heat of the seal part is higher than the heat dissipation at the heat-resistant and wear-resistant part. As a result, the heat resistance of the heat-resistant and wear-resistant part may be exceeded, or the heat of the heat-resistant and wear-resistant part may be transferred to the front shroud, causing the resin front shroud to be deformed or damaged. There is a possibility that We had a problem that.

The present invention solves the above-described conventional problems by enabling the use of a complicated three-dimensional curved blade along the airflow and reducing the return loss at the inlet of the impeller. An object of the present invention is to provide an electric blower that can be used at a high rotational speed by increasing the blowing efficiency and effectively dissipating the sliding frictional heat of the seal portion.

  In order to solve the above-described conventional problems, an electric blower of the present invention and a vacuum cleaner using the electric blower include an electric motor having a rotating shaft, an impeller that is rotationally driven by the electric motor and has an intake port in the center, and the impeller A fan case having a suction port that communicates with the intake port, and the impeller includes an upstream upper impeller made of a highly heat conductive material and a downstream lower impeller made of a resin material. The lower impeller includes a front shroud, a rear shroud spaced apart from the front shroud, and a plurality of blades sandwiched between the pair of shrouds. A plurality of wings having a surface, and a ring part that abuts at least a part of the wings, and the upper impeller and the lower impeller are fitted to each other. And the impeller is configured such that the inner and outer peripheral surfaces of the outer ring portion are connected in series with the inner and outer peripheral surfaces of the front shroud, and the front and back surfaces of the wing portion are connected in series with the front and back surfaces of the blade. The air inlet and the air inlet of the fan case have a contact seal structure.

  This makes it possible to use a complicated three-dimensional curved surface shape along the air flow by using the blade as a resin material, and it is possible to reduce the return loss at the inlet of the impeller. High efficiency, and the airflow directly hits, the uneven surface is provided and the contact area is increased to improve the heat dissipation performance. However, since the sliding frictional heat of the seal portion is effectively dissipated, it is possible to prevent the parts such as the resin blade and the front shroud from being deformed or damaged. And the vacuum cleaner using this electric blower is a very practical thing with high ventilation efficiency and strong suction power.

  The electric blower of the present invention and the electric vacuum cleaner using the electric blower are composed of two parts, the upper and lower impellers, and the upper impeller on the upstream side is made of a material having high thermal conductivity such as metal, and the wings of the upper impeller. With a configuration that provides an uneven surface, the lower impeller on the downstream side is made of a resin material with a high degree of freedom of shape, and the air intake efficiency of the impeller and the suction inlet of the fan case are made a contact-type seal configuration, so that the air blowing efficiency The sliding frictional heat of the seal portion is effectively radiated from the wing portion of the upper impeller even when used at a high rotational speed, so that the resin parts are not deformed or damaged.

Sectional drawing of the electric blower which shows the 1st Embodiment of this invention The perspective view of the impeller of the electric blower The partial sectional view of the lower impeller of the electric blower (A) The top view which shows the metal mold | die structure of the blade of an electric blower, and a rear surface shroud (b) The side view which shows the metal mold structure of the blade of an electric blower, and a rear surface shroud Same as above, rear perspective view of front shroud of electric blower (A) Same as above, perspective view of upper impeller of electric blower (b) Same as above, rear side perspective view of upper impeller of electric blower (A) The top view of the upper impeller of the electric blower (b) The side view showing the mold configuration of the upper impeller of the electric blower. (A) The top view of the upper impeller of the electric blower (b) The WW partial sectional view of the upper impeller of the electric blower (A) Same perspective view of upper impeller of another form of electric blower (b) Same as above, rear perspective view of upper impeller of another form of electric blower (A) The top view of the upper impeller of another form of the electric blower (b) The XX partial sectional view of the upper impeller of the other form of the electric blower. The perspective view of the impeller of the 2nd Embodiment of this invention (A) Top view of the upper impeller of the electric blower (b) YY sectional view of the upper impeller of the electric blower Whole block diagram of the vacuum cleaner which shows the 3rd Embodiment of this invention Partial sectional view of a conventional electric blower Partial sectional view of the impeller of the electric blower (A) The top view which shows the metal mold | die structure of the inducer of an electric blower (b) The side view which shows the metal mold | die structure of the inducer of an electric blower same The perspective view of the impeller of another form of the electric blower (A) Sectional drawing of each component of impeller of another form of electric blower (b) Sectional drawing of impeller of electric blower (A) Partial sectional view of another embodiment of the electric blower (b) Same as above, B part enlarged view of the electric blower

  A first invention includes an electric motor having a rotating shaft, an impeller that is rotationally driven by the electric motor and has a suction port in the center, and a fan case that covers the impeller and has a suction port that communicates with the suction port, The impeller includes an upstream upper impeller made of a material having high thermal conductivity and a downstream lower impeller made of a resin material. The lower impeller is arranged with a front shroud and a distance from the front shroud. And a plurality of blades sandwiched between the pair of shrouds. The upper impeller includes a plurality of wings having an uneven surface and at least a part of these wings. And a fitting portion between the upper impeller and the lower impeller, the inner and outer peripheral surfaces of the outer ring portion and the inner and outer peripheral surfaces of the front shroud. It is connected to a series, and the front and back surfaces of the wings are connected so as to be connected in series with the front and back surfaces of the blade, and the intake port of the impeller and the suction port of the fan case are configured as a contact-type seal configuration. By using a resin material for the blade, it becomes possible to use a complicated three-dimensional curved surface shape along the air flow, and it is possible to reduce the return loss at the inlet of the impeller, so that the blowing efficiency is improved. High, furthermore, the airflow directly hits it, and the wing part and the ring part, which have improved heat dissipation performance by providing an uneven surface, are in thermal contact, so the sliding friction of the seal part even when used at high rotational speeds Since heat is effectively radiated from the wing portion through the ring portion, it is possible to prevent the parts such as the resin blade and the front shroud from being deformed or damaged.

  In a second aspect of the present invention, in particular, in the first aspect, the uneven surface provided on the pressure surface side of the wing portion of the upper impeller flows from the intake port and flows on the pressure surface side surface of the wing portion. By being provided in the direction along the air flow, loss due to the air current colliding with the uneven surface can be reduced on the pressure surface side where the air current easily flows along the wing surface.

  In a third aspect of the invention, particularly in the first or second aspect of the invention, the uneven surface provided on the suction surface side of the wing portion of the upper impeller flows into the suction port and flows into the suction surface side of the wing portion. By providing it in a direction that intersects the flow of air flowing on the surface, large fluid separation can occur by causing small fluid separation by the uneven surface on the suction surface side where airflow is easy to fluid separation on the wing surface. Since it becomes possible to prevent, the peeling loss which arises by the disturbance of the airflow by big fluid peeling can be reduced.

According to a fourth aspect of the present invention, in particular, in any one of the first to third aspects, the length of the wing portion in the axial direction of the upper impeller is configured such that the inner peripheral side is shorter than the outer peripheral side. Since the area on the inner peripheral side of the wings can be reduced, even when the number of blades is large, it is possible to configure the wings so that they do not overlap when viewed from the axial direction. This makes it possible to perform die casting with a simple two-plate mold. Furthermore, since the area of the outer wing portion through which a large amount of airflow flows can be increased, the heat radiation performance can be maintained or improved even if the inner rim side area of the wing portion is reduced.

  The fifth aspect of the invention is an extremely practical electric vacuum cleaner that has high blowing efficiency and strong suction power, in particular, by using the electric vacuum cleaner having the electric blower according to any one of the first to fourth aspects of the invention. Can be obtained.

  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 to 7 show an electric blower according to Embodiment 1 of the present invention.

  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 brushless motor, and includes a rotor 104 having a rotating shaft 103, a stator portion 105, a bracket 106 covering them, and a control device (not shown). The impeller 120 is connected to the rotating shaft 103 by a nut 107.

  As shown in FIG. 2, the impeller 120 includes an upper impeller 121 on the upstream side and a lower impeller 122 on the downstream side.

  As shown in FIG. 3, the lower impeller 122 includes a resin rear shroud 124 having a substantially conical hub portion 123, a resin front shroud 125 opposed thereto, a pair of rear shrouds 124, and a front shroud 125. It is composed of seven resin blades 126 having a three-dimensional curved surface provided therein.

  The blade 126 is formed integrally with the rear shroud 124. As shown in FIGS. 4A and 4B, the mold structure of the blade 126 and the rear surface shroud 124 includes a seven-way slide mold 131 having an angular interval of about 51 degrees, a core 132, and a cavity 133. It is made up of. In this embodiment, the blade 126 and the rear shroud 124 are configured as shown in FIGS. 4A and 4B by configuring the blade 126 so that adjacent blades do not overlap each other when viewed from the core 132 side. With a simple mold structure, it can be injection-molded integrally.

  Further, as shown in FIG. 5, the front shroud 125 is provided with a groove 142 along the contact surface 141 of the blade 126, and after the protrusion 143 of the blade 126 including the contact surface 141 is fitted into the groove 142. Both are fixed by performing a heat welding process.

  As shown in FIGS. 6A and 6B, the upper impeller 121 includes a ring portion 151, a wing portion 152, and a central fitting portion 153, and uses aluminum which is a metal having high thermal conductivity. Are integrally molded. In the present embodiment, as shown in FIG. 7A, the mold structure of the upper impeller 121 is configured such that adjacent wings 152 do not overlap when viewed from the core 161 side and the cavity 162 side. As shown in FIG. 7B, die casting can be integrally performed by a simple two-plate mold having a core 161 and a cavity 162.

Further, as shown in FIGS. 6A and 6B and FIGS. 8A and 8B, the pressure surface 171 side of the wing 152, that is, the front side of the wing 152 with respect to the arrow Z indicating the rotation direction. In the range excluding the vicinity of the tip 172 of the wing 152, a groove 173 is provided in a direction along the air flow P flowing on the pressure surface 171 side surface of the wing 152. Further, on the suction surface 174 side of the wing portion 152, that is, on the back surface side of the wing portion 152 with respect to the rotation direction Z, a rib portion 175 is disposed on the suction surface 174 side surface of the wing portion 152 near the tip 172 of the wing portion 152. It is provided in a direction crossing the flowing air flow Q.

  As shown in FIGS. 3 and 6B, the upper impeller 121 and the lower impeller 122 are provided with a stepped step portion 182 b on the fitting portion 181 b of the blade 126, and the fitting portion 181 a of the wing portion 152 is provided on the fitting portion 181 a. In addition, a stepped step portion 182 a is provided, and a pin 184 and a hole portion 185 are provided in fitting portions 183 a and 183 b between the ring portion 151 and the front shroud 125, respectively, and provided in the hub portion 123 of the lower impeller 122. The cylindrical portion 186 is assembled on the outer peripheral side by inserting the center fitting portion 153 of the upper impeller 121, and an adhesive is applied to fix both.

  The impeller 120 assembled in this way is attached to the rotating shaft 103 by a nut 107. Here, the outer diameter of the nut 107 is larger than the inner diameter of the center fitting portion 153, more preferably equal to the outer diameter of the center fitting portion 153, so that the upper impeller 121 is rotated from the lower impeller 122 to the rotating shaft. 103 can be prevented from being displaced in the axial direction.

  An air guide 191 is provided around the impeller 120. This is to gradually reduce the flow velocity of the air discharged from the impeller 120, thereby converting the energy of the flow velocity into the energy of pressure and improving the blowing efficiency. The impeller 120 and the air guide 191 are enclosed by a metal fan case 192. A fan case spacer 193 made of PTFE is attached to the fan case 192 with an adhesive. Here, by attaching the fan case 192 and the fan case spacer 193 so that the fan case spacer 193 and the ring portion 151 are in contact with each other, the suction port 194 of the fan case 192 and the intake port 195 of the impeller 120 are contact-type sealed. It is configured.

About the electric blower 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 104 of the electric motor 102 rotates, and the rotary shaft 103 rotates accordingly, and the impeller 120 attached to the rotary shaft 103 by the nut 107 is in the direction of arrow Z in FIG. Rotate to.

  As the impeller 120 rotates, air flows from the suction port 194 of the fan case 192 and flows into the impeller 120 through the intake port 195 of the impeller 120. And it discharges from the outer peripheral part of the impeller 120 through the internal flow path of the impeller 120.

  Here, when air passes through the internal flow path of the impeller 120, if a gap is generated between the ring portion 151 and the wing portion 152 of the upper impeller 121 or between the wing portion 152 and the center fitting portion, the air passes through the gap. Leaks and turbulence of the airflow occurs, reducing the air blowing efficiency. However, in the present embodiment, the ring portion 151, the wing portion 152, and the center fitting portion 153 are integrally formed by die casting, so that it can be easily configured so that no gap is generated between the components. Therefore, it is possible to prevent a reduction in blowing efficiency due to the turbulence of the air flow caused by the gap.

Similarly, the rear surface shroud 124 and the blade 126 of the lower impeller 122 are integrally formed by injection molding, and the protruding portion 143 of the blade 126 is fitted into the groove 142 provided in the front surface shroud 125, and then a heat welding process is performed. Accordingly, it is possible to configure not to create a gap not only between the rear shroud 124 and the blade 126 but also between the blade 126 and the front shroud 125. Therefore, these gaps are also formed in the lower impeller 122. It is possible to prevent a reduction in the air blowing efficiency due to the turbulence of the air flow caused by the air.

  Further, since the blade 126 of the lower impeller 122 is made of a resin having a high degree of freedom in shape, the blade 126 can be complicatedly twisted with respect to the rear shroud 124 as shown in FIG. . Therefore, by making the three-dimensional curved surface shape suitable for the airflow flowing through the impeller 120 over the entire blade 126, it is possible to suppress the turbulence of the airflow inside the impeller 120 and improve the blowing efficiency.

The air discharged from the outer periphery of the impeller 120 flows into the air guide 191. Here, when a gap is generated between the air inlet 195 of the impeller 120 and the air inlet 194 of the fan case 192, the air discharged from the impeller 120 passes through the space between the impeller 120 and the fan case 192. ,
The air again flows into the impeller 120 from the intake port 195 of the impeller 120. Since this flow is a flow that does not contribute to the blowing efficiency, it becomes a recirculation loss and reduces the blowing efficiency. However, in this embodiment, since the fan case spacer 183 and the ring portion 151 are configured to contact each other, the suction port 194 of the fan case 192 and the intake port 195 of the impeller 120 have a contact seal structure. Reflux loss does not occur, and air blowing efficiency can be improved.

  At this time, as the impeller 120 rotates, sliding frictional heat is generated between the abutting fan case spacer 193 and the ring portion 151. However, in the present embodiment, the ring portion 151 and the wing portion 152 are made of aluminum having high thermal conductivity, and the ring portion 151 and the wing portion 152 that is directly exposed to the airflow are integrally molded so as not to generate a gap. Therefore, the sliding frictional heat is effectively transmitted from the ring portion 151 to the wing portion 152. The wing portion 152 is provided with an uneven surface, that is, a groove portion 173 on the pressure surface 171 side and a rib portion 175 on the negative pressure surface 174 side. Since the heat is radiated, the resin blade 126, the front shroud 125, and the fan case spacer 193 can be prevented from being deformed or damaged by the sliding frictional heat. This makes it possible to use an electric blower with a high rotational speed, an impeller with a wide intake port, and the like where the contact portion has a high peripheral speed and a large amount of sliding frictional heat.

  Here, in the vicinity of the pressure surface 171, the airflow flows along the pressure surface 171 as shown by the air flow P, but the groove 173 is provided in the direction along the air flow P as shown in FIG. Therefore, loss due to the air current colliding with the step of the groove 173 can be reduced. Further, since the groove 173 is provided in a range excluding the vicinity of the tip 172 of the wing 152, the loss caused by the airflow immediately after entering the wing 152 from the air inlet 195 is disturbed by the groove 173 is reduced. can do. In the present embodiment, the groove 173 is provided with an uneven surface on the pressure surface 171 of the wing 152 so that the surface area in contact with the airflow is increased and the heat dissipation performance is improved, but FIG. 9A and FIG. And ribs 176 may improve the heat dissipation performance, as shown in FIGS. 10 (a) and 10 (b). Even in this case, by providing the uneven surface with the rib portion 176 in the direction along the air flow P, the heat dissipation performance can be enhanced while reducing the loss.

Further, fluid separation is likely to occur on the negative pressure surface 174 side, and loss is likely to occur due to turbulence of the airflow, but in this embodiment, as shown in FIG. 6A, a rib portion 175 is provided on the negative pressure surface 174 side. Since it is provided in a direction intersecting with the air flow Q near the negative pressure surface 174, it is possible to prevent a large fluid separation by causing a small fluid separation at the rib portion 175. The loss due to can be reduced. Further, since fluid separation starts to occur from the vicinity of the tip 172 of the wing portion 152, the fluid separation can be effectively reduced by providing the rib portion 175 in the vicinity of the tip 172 of the wing portion 152.

  In the present embodiment, the rib surface 175 is provided with an uneven surface on the negative pressure surface 174 of the wing portion 152 to increase the surface area in contact with the air flow and improve the heat dissipation performance. However, FIG. As shown in b) and FIGS. 10A and 10B, the heat radiation performance may be improved by the groove 177. Even in this case, by providing the uneven surface with the groove 177 in the direction intersecting with the air flow Q, the heat dissipation performance can be improved while reducing the loss.

  In this embodiment, the PTFE fan case spacer 193 is attached to the fan case 192 with an adhesive. However, the fan case spacer 183 is made of a resin such as PET and is integrally formed with the metal fan case 192. The metal ring part 151 may be assembled by rotating the impeller 120, and the resin fan case spacer 193 may be contacted and sealed. Since the sliding friction heat generated between the fan 151 and the fan case spacer 193 is effectively radiated from the wing 152, the resin fan case spacer 193 is deformed or damaged by the sliding friction heat during use. Can be prevented.

  Furthermore, in this embodiment, since the ring portion 151 is made of metal aluminum, the heat resistance, strength, and wear resistance are superior to general resins. Since it can be prevented from being deformed or damaged by dynamic frictional heat or wear, it can also be used in a high-speed rotation range of 50000 r / min or more.

  Further, when the impeller 120 rotates in the Z direction, the ring portion 151 is applied with a force in a direction opposite to the rotation direction Z due to sliding friction, so that the integrally molded upper impeller 121 is in contact with the lower impeller 122. , It tries to shift in the direction opposite to the rotation direction Z. However, in the present embodiment, the pin 184 provided in the front shroud 125 and the hole 185 provided in the rear shroud 124 are fitted to each other, so that the upper impeller 121 is disposed in the lower direction in the rotation direction Z and the opposite direction. In addition to preventing displacement with respect to the impeller 122, stepped step portions 182 a and 182 b provided in the fitting portions 181 a and 181 b between the wing portion 152 and the blade 126 are replaced with suction surfaces 174 of the blade 126. In other words, the upper impeller 121 is prevented from shifting with respect to the lower impeller 122 in the direction opposite to the rotation direction Z by forming the convex portion on the back side of the blade 126 with respect to the rotation direction Z.

  Here, a force is also applied to the blade 126 in the direction opposite to the rotational direction Z via the stepped portions 182a and 182b, but the blade 126 and the rear shroud 124 are integrally formed by injection molding, and the blade 126 is a front shroud. Since the protrusion 143 is inserted into the groove 142 provided in 125 and then fixed by heat welding, the resin blade is deformed by the force of sliding friction. It is the structure which is not damaged or damaged.

  The air flowing into the air guide 191 flows out from the outer periphery of the air guide 191 and passes through the flow path between the outer periphery of the bracket 106 of the motor 102 and the fan case 192, thereby cooling the motor 102 from the outside. It has become.

As described above, in the present embodiment, the impeller 120 is composed of two upper and lower parts, the upstream upper impeller 121 is composed of aluminum, which is a metal having high thermal conductivity, and the groove portion is formed in the blade portion 152 of the upper impeller 121. 173 and ribs 175 are provided with an uneven surface, the downstream lower impeller is made of a resin material having a high degree of freedom, and the impeller inlet and the fan case inlet are contact-type seal configurations. By doing so, the sliding frictional heat of the seal portion is effectively dissipated from the wing portion 152 of the upper impeller 121 even when used at a high rotational speed, so that the resin parts may be deformed or damaged. An electric blower that does not need to be performed can be realized.

(Embodiment 2)
FIG. 11 shows an impeller 201 of an electric blower in Embodiment 2 of the present invention.

  The present embodiment is different from the first embodiment in that the number of blades 205 of the upper impeller 202 and the lower impeller 204 is eight, and the rotating shaft (not shown) of the blade 203. The upper impeller 202 and the lower impeller 204 are divided so that the length in the direction is shorter on the inner peripheral side than on the outer peripheral side. Others are the same as those of the first embodiment, and the same numbers are assigned and detailed description is omitted.

  Since the length of the wing part 203 in the direction of the rotation axis (not shown) is shorter on the inner peripheral side than on the outer peripheral side, the area on the inner peripheral side of the wing part 203 can be reduced. Even if the number is increased, as shown in FIG. 12A, it is possible to configure each wing 203 so as not to overlap when viewed from the direction of the rotation axis (not shown). Therefore, as in the first embodiment, molding is possible by die casting using a simple two-plate mold having a core and a cavity. Further, since the area of the outer wing portion 203 through which a large amount of airflow flows can be increased, the heat radiation performance can be improved even if the inner peripheral side area of the wing portion 203 is reduced.

(Embodiment 3)
FIG. 13 shows a vacuum cleaner according to Embodiment 3 of the present invention.

  In FIG. 13, the electric vacuum cleaner 301 has a hose 302, an extension pipe 303, and a suction tool 304 that sucks dust by moving on the floor surface. An electric blower 308 having an impeller 307 is incorporated.

  About the vacuum cleaner comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the vacuum cleaner 301 is activated, the electric blower 308 blows air. Since the electric blower 308 is provided with the impeller 307 shown in Embodiment 1 inside, the blower efficiency is high, and even if it is used at a high rotational speed, the resin parts are deformed by the sliding frictional heat of the seal portion. Since it is not damaged, the vacuum cleaner itself has a strong suction force 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 configured by the upper and lower parts of the impeller, and the upstream upper impeller is formed of a material having high thermal conductivity such as metal. The wing part of the upper impeller is provided with a concavo-convex surface, the lower impeller on the downstream side is made of a resin material having a high degree of freedom, and the inlet of the impeller and the suction inlet of the fan case are configured as a contact type seal. By doing so, the sliding frictional heat of the seal part is effectively radiated from the wing part of the upper impeller even when used at a high rotational speed, so that the resin parts may be deformed or damaged Therefore, it can be applied not only to home use but also to business equipment.

DESCRIPTION OF SYMBOLS 101 Electric blower 102 Electric motor 103 Rotating shaft 104 Rotor part 120 Impeller 121 Upper impeller 122 Lower impeller 124 Rear shroud 125 Front shroud 126 Blade 151 Ring part 152 Wing part 171 Pressure surface 173 Groove part (Uneven surface)
174 Suction surface 175 Rib part (concave / convex surface)
176 Rib (Rough surface)
177 Groove (uneven surface)
181a Fitting portion 181b Fitting portion 183a Fitting portion 183b Fitting portion 192 Fan case 194 Suction port 195 Air inlet 201 Impeller 202 Upper impeller 203 Wing portion 204 Lower impeller 205 Blade 301 Vacuum cleaner 307 Impeller 308 Electric blower

Claims (5)

An electric motor having a rotating shaft;
An impeller that is rotationally driven by the electric motor and has an air inlet in the center;
A fan case covering the impeller and having a suction port communicating with the suction port;
The impeller includes an upstream upper impeller made of a material having high thermal conductivity;
It consists of a lower impeller on the downstream side made of resin material,
The lower impeller is
A front shroud,
A rear shroud spaced apart from the front shroud;
It is composed of a plurality of blades sandwiched between this pair of shrouds,
The upper impeller is
A plurality of wings having an uneven surface;
It is composed of a ring part that contacts at least a part of these wing parts,
The fitting portion between the upper impeller and the lower impeller is:
The inner and outer peripheral surfaces of the ring portion are connected in series with the inner and outer peripheral surfaces of the front shroud,
And the electric blower which made it the structure which connected so that the front and back of the said wing | blade part might be connected in series with the front and back of the said blade, and made the suction inlet of the said impeller and the suction inlet of the said fan case contact type seal | sticker structure. The uneven surface provided on the pressure surface side of the wing portion of the upper impeller is:
The electric blower according to claim 1, wherein the electric blower is provided in a direction along an air flow that flows in from the intake port and flows on a pressure surface side surface of the wing portion. The uneven surface provided on the suction surface side of the wing portion of the upper impeller is:
3. The electric blower according to claim 1, wherein the electric blower is provided in a direction intersecting with a flow of air that flows in from the intake port and flows on a suction surface side surface of the wing portion. The axial length of the wing portion of the upper impeller is:
The electric blower according to claim 1, wherein the inner peripheral side is configured to be shorter than the outer peripheral side. The vacuum cleaner which has an electric blower of any one of 1-4.