JP2013060874A - Electric air blower and electric vacuum cleaner using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric air blower for an electric vacuum cleaner having high blowing efficiency and usable at high rotation speed.SOLUTION: An impeller 120 is composed of two upper and lower parts, an impeller A120a at the upstream side is composed of metal with high heat conductivity, an impeller B120b at the downstream side is composed of a resin material, and an air inlet 195 of the impeller 120 and a suction port 194 f a fan case 192 are formed as a contact-type seal composition, so that blowing efficiency is raised, and as sliding frictional heat at a seal part is released from a blade A126a of the impeller A120a even under use at high rotation speed, a resin made component of the impeller B120b is not deformed nor damaged, and further, the impeller A120a is provided with position shift prevention means against the impeller B120b both in a rotary shaft direction and a circumferential direction of the rotary shaft, thus preventing the occurrence of leakage loss and loss due to flow disturbance caused by shifting between the blade A126a and the blade 126b, so that the electric air blower with high blowing efficiency can be achieved.

Description

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

  Conventionally, as this type of electric blower, as shown in FIG. 12, 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 is made of a sheet metal rear shroud 11, a sheet metal front shroud 12 spaced from the rear shroud 11, and a plurality of sheet metal sandwiched between a pair of rear shrouds 11 and the front shroud 12. The blade 13 and a resin inducer 15 provided corresponding to the air inlet 14 provided in the center of the front shroud 12 are configured. The sheet metal blade 13 is attached to each rear shroud 11 and front shroud 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.

  14A and 14B 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).

  Further, as shown in FIG. 15, an impeller 31 made of a resin material is divided into a rear shroud 32 and a front shroud 33 in units of blades. 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. 16A and 16B, the front shroud 41 and the rear shroud 42 made of a metal material are provided with projection holes 43 and 44, and are 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. 17 (a) and 17 (b), a suction port 51 is provided at the center, and a resin front shroud 52, a resin rear shroud 53, and a plurality of three-dimensional curved shapes are provided. An impeller 55 composed of a plurality of resin blades 54, a fan case 57 having a suction port 56 at the center and covering the impeller 55, and the front shroud 52 on the side of the suction port 51 The heat-resistant and wear-resistant part 58 such as a metal ring provided at the end of the fan and the resin seal part 59 provided at the end of the fan case 57 on the suction port 56 side come into contact with each other. Since the mouth 51 and the suction port 56 of the fan case 57 have a contact seal structure, the air discharged from the impeller 55 is prevented from returning to the inside of the impeller 55 from the intake port 51 again, and the blowing efficiency is improved. By configuring one of the tactile seal configurations with resin and the other with a material having heat resistance and wear resistance such as metal, the resin front shroud 52 may be deformed or damaged by sliding frictional heat of the seal portion. There are also configurations that do not (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 at that time, it is difficult to construct a complicated three-dimensional curved surface shape such as a twist shape because the blade is made of sheet metal and is attached to the front shroud and the rear shroud by caulking. For this reason, since only the resin-made inducer portion can be configured with a complicated three-dimensional curved surface shape that matches the flow of the airflow, there is a problem that the restriction on the shape is large.

  Further, in the conventional configuration shown in FIG. 15, it is possible to make the entire blade surface into a complicated shape according to the flow of the air flow by making all the blades made of resin. 17A, when the suction port 56 of the fan case 57 and the suction port 51 of the impeller 55 have a contact-type seal configuration, the resin-made front shroud is caused by the sliding frictional heat at the seal portion. Since 33 may be deformed or damaged, it is unavoidable to have a non-contact type seal configuration, so that it is impossible to prevent the return loss of the air discharged from the impeller from entering the inlet of the impeller again. Had problems.

  In the conventional configuration shown in FIGS. 16 (a) and 16 (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.

  Furthermore, in the conventional configuration shown in FIGS. 17A and 17B, 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. 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-mentioned conventional problems, and makes it possible to use a complicated three-dimensional curved wing portion along the air flow or reduce the return loss at the inlet of the impeller. Therefore, it is possible to increase the blowing efficiency, dissipate the sliding frictional heat of the seal part, and prevent the upstream impeller A from shifting in the direction opposite to the rotational direction due to the sliding friction. It aims at providing the electric blower made possible.

  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 impeller A made of a metal material and a downstream impeller B made of a resin material, and the impeller B Is composed of a front shroud, a rear shroud having a hub portion B, spaced apart from the front shroud, and a plurality of wing portions B sandwiched between the pair of shrouds, and the impeller A Is composed of a plurality of wing parts A, an outer ring part and an inner hub part A that are in contact with at least a part of these wing parts A, and the wing parts A and B. The engaging portion is provided on each mating surface, the hub portion A is inserted into the outer periphery of the hub portion B, and the impeller B is fixed to the rotating shaft by a fastening body from above the hub portion B. The wing part B and the wing part A are connected by the engaging part, and the upper surface part of the hub part A is disposed so as to be in contact with and covered with the lower surface part of the fastening body. The structure is such that the movement in the direction of the rotation axis is restricted, and the intake port of the impeller and the suction port of the fan case are configured as a contact seal.

  This makes it possible to use a complicated three-dimensional curved surface shape along the air flow by using the wing portion B as a resin material, and it is possible to reduce the return loss at the inlet of the impeller. Because the air blowing efficiency is high and the airfoil A directly exposed to the airflow and the ring part are in thermal contact, the sliding frictional heat of the seal part is effectively dissipated even when used at a high rotational speed. Therefore, it is possible to prevent parts such as the resin wing B and the front shroud from being deformed or damaged.

  Also, due to the frictional resistance of the seal portion, a force in the direction opposite to the rotation direction of the impeller is applied to the impeller A. However, the wing portion B and the wing portion A are connected by the engaging portion so that the rotation is achieved. The impeller A is prevented from shifting with respect to the impeller B in the circumferential direction of the shaft. Furthermore, since the impeller A is prevented from shifting with respect to the impeller B by the fastening body also in the rotation axis direction, it is possible to prevent the turbulence of the air flow due to the displacement of the wing B and the wing A. it can.

  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 vacuum cleaner using the electric blower are composed of an impeller having two upper and lower parts, an upstream impeller A is composed of a metal material having high thermal conductivity, and a downstream impeller B is shaped. It is made of a resin material with a high degree of freedom, and the impeller intake port and the fan case intake port have a contact-type seal configuration, so that the air blowing efficiency is high and the seal part slides even when used at high rotational speeds. Since the dynamic frictional heat is radiated from the wing part A of the impeller A, the resin part is not deformed or damaged. Further, since the impeller A is provided with means for preventing the impeller B from moving in both the rotation axis direction and the circumferential direction of the rotation axis, it is possible to avoid the problem caused by the deviation of the wing part B and the wing part A. Is possible.

Sectional drawing of the electric blower which shows the 1st Embodiment of this invention Same perspective view of impeller A and impeller B of electric blower Same partial sectional view of impeller B of electric blower (A) The top view which shows the metal mold | die structure of the wing | blade part B of an electric blower, and a rear surface shroud (b) The side sectional drawing which shows the metal mold | die structure of the wing | blade part B of an electric blower, and a rear surface shroud Same as above, rear perspective view of front shroud of electric blower (A) Upper perspective view of the impeller A of the electric blower (b) Rear perspective view of the impeller A of the electric blower (A) The top view of the impeller A of the electric blower (b) The side sectional view showing the mold configuration of the impeller A of the electric blower (b) (A) The top view of the impeller of the electric blower (b) Same as above, (b) The YY partial cross-sectional view of FIG. 8 (a) showing the wing portion of the impeller of the electric blower The perspective view of the impeller A and the impeller B of the 2nd Embodiment of this invention (A) Upper perspective view of the impeller A of the electric blower (b) Rear perspective view of the impeller A 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 same, The side sectional drawing which shows the metal mold | die structure of the inducer of an electric blower The perspective view of the impeller of another form of the electric blower (A) Sectional drawing of each component of the impeller of another form of the electric blower (b) Side sectional view of the impeller of the electric blower (A) Partial sectional view of another embodiment of the electric blower (b) Same as above, (b) Enlarged view of part B in FIG. 17 (a) 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 impeller A made of a metal material and a downstream impeller B made of a resin material, and the impeller B is disposed at a distance from the front shroud and the front shroud. A rear shroud having B and a plurality of wing parts B sandwiched between the pair of shrouds. The impeller A includes a plurality of wing parts A and at least a part of these wing parts A. The wing portion A and the wing portion B are provided with engaging portions on respective mating surfaces, and the hub portion B. On the outer periphery of the The wing part B and the wing part A are connected by the engaging part by inserting the part A and fixing the impeller B to the rotating shaft by a fastening body from the upper part of the hub part B. The hub portion A is arranged so that the upper surface portion of the hub portion A is in contact with and covered with the lower surface portion of the fastening body, so that the movement in the rotation axis direction is restricted, and the air intake port of the impeller and the fan case A suction-type seal configuration was adopted for the suction port.

  With this configuration, it is possible to use a complicated three-dimensional curved surface shape along the air flow by using the wing part B as a resin material, and it is possible to reduce the return loss at the inlet of the impeller. Therefore, the air blowing efficiency is high and the sliding frictional heat of the seal portion is radiated from the wing portion A of the impeller A even when used at a high rotational speed, so that the resin parts are not deformed or damaged. Further, since the impeller A is provided with means for preventing the impeller B from moving in both the rotation axis direction and the circumferential direction of the rotation axis, it is possible to avoid the problem caused by the deviation of the wing part B and the wing part A. Is possible.

  In the second invention, in particular, in the first invention, the engaging portion is a stepped portion configured such that a convex portion is provided on the suction surface side in the wing portion B. It is possible to prevent the wing part A from moving in the direction opposite to the rotation direction due to the resistance of the air.

  According to a third aspect of the present invention, in the first aspect of the present invention, in the first aspect of the present invention, the engaging portion may be a first stepped portion configured such that a convex portion is provided on the outer pressure side of the wing portion B, and the wing portion B. When the impeller A and the impeller B are assembled, the position is determined by each blade when the second stepped portion is configured such that the convex portion is provided on the pressure surface side on the inner peripheral side. Wings B will not be offset and assembled.

  In a fourth aspect of the invention, in particular, in any one of the first to third aspects of the invention, the engagement surface of the engaging portion in the circumferential direction with respect to the rotation axis is configured to be substantially vertical, so that the circumferential direction Even when a force is applied to the blade, the force is not dispersed in the direction of the rotation axis, so that the wing portion A and the wing portion B can be prevented from being displaced in the direction of the rotation axis.

  According to a fifth invention, in particular, in any one of the first to fourth inventions, an uneven engagement portion having a taper portion is provided on a mating surface in the rotation axis direction of the hub portion A and the hub portion B. Because the upper end surface is higher than the engagement portion provided on the mating surface of the part A and the wing part B, when the inducer A and the inducer B are assembled, the position is likely to be shifted slightly. However, since the taper portion guides to a predetermined position, the assemblability is improved.

  The sixth aspect of the invention is an extremely practical electric vacuum cleaner that has a high blowing efficiency and a strong suction force, particularly by using the electric vacuum cleaner having the electric blower according to any one of the first to fifth 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 8 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 portion 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 upstream impeller A 120a and a downstream impeller B 120b.

  As shown in FIG. 3, the impeller B 120 b is provided in a resin rear shroud 124 having a substantially conical hub portion B 123 b, a resin front shroud 125 opposed to the resin rear shroud 125, and the pair of shrouds 124 and 125. It consists of seven resin wings B126b having a three-dimensional curved surface shape.

  The wing B126b is formed integrally with the rear shroud 124. As shown in FIGS. 4 (a) and 4 (b), the mold structure of the wing B126b and the rear shroud 124 is composed of a seven-way slide mold 131 having an interval of about 51 degrees, a core 132, and a cavity. 133. In the present embodiment, the wing B126b and the rear shroud 124 are configured as shown in FIGS. 4A and 4B by configuring the adjacent wings B126b so as not to overlap each other when viewed from the core 132 side. Simple mold structure that can be injection-molded integrally.

Further, as shown in FIG. 5, the front shroud 125 has a contact surface 141 of the wing B126b.
A groove 142 is provided, and after the protrusion 143 of the wing B126b 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 impeller A 120a includes a ring portion 151, a wing portion A 126a, and a hub portion A 123a. The impeller A 120a is integrally formed of aluminum, which is a metal having high thermal conductivity. Molded. In the present embodiment, as shown in FIG. 7A, the mold structure of the impeller A 120a is configured so that the adjacent wing parts A 126a 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 two-plate mold having a simple core 161 and a cavity 162.

  As shown in FIGS. 3 and 6B, the impeller A 120a and the impeller B 120b are provided with stepped step portions 172a and 172b on the mating surfaces 171a and 171b of the wing portions A 126a and B 126b, respectively. It has been. As shown in FIG. 8, the stepped portions 172a and 172b are configured such that a convex portion 175 is provided on the negative pressure surface 174 side of the wing portion B126b.

  Here, the circumferentially mating surfaces 176a and 176b of the stepped portions 172a and 172b with respect to the rotating shaft 103 are configured so as not to be tapered but to be aligned on a substantially vertical surface. In addition, a pin 177 and a hole 178 are provided on the mating surfaces 173a and 173b of the ring portion 151 and the front shroud 125, respectively.

  Further, the hub portion A123a of the impeller A120a and the hub portion B123b of the impeller B120b are provided with a plurality of engaging portions 182a and 182b having taper portions 181a and 181b on both sides, and the engaging portions 182a and 182b The height in the direction of the rotating shaft 103 is configured to be higher than the heights of the step portions 172a and 172b provided on the wing portion A126a and the wing portion B126b and the pin 177 provided on the ring portion 151.

  The impeller A 120a is assembled by inserting the hub portion A 123a into the outer peripheral side of the cylindrical portion 183 provided in the hub portion B 123b of the impeller B 120b. At this time, even if the position is slightly shifted, the taper portion 181a and the taper portion 181b provided in the engaging portions 182a and 182b lead to a predetermined position, so that the assemblability can be greatly improved.

  Note that if there is a gap between the impeller A 120a and the impeller B 120b, air leaks from the gap and causes a loss. Therefore, it is desirable to fill these gaps with an adhesive or coating.

  The impeller 120 assembled in this way is attached to the rotating shaft 103 by a nut 107. Here, the height of the cylindrical portion 183 and the hub portion A123a is equal so that the nut 107 contacts the hub portion A123a of the impeller A120a, that is, the fastening force of the nut 107 is applied to the hub portion A123a. By configuring the cylindrical portion 183 to be slightly shorter (the lower surface portion 185 of the upper portion of the cylindrical portion 183 is configured to be flush with or slightly lower the upper surface portion 184 of the hub portion A123a), The impeller A 120 a and the impeller B 120 b are pressed so as not to be displaced in the circumferential direction of the rotating shaft 103 and in the direction of the rotating shaft 103. Since the hub portion A123a is made of a metal material, the impeller A120a is prevented from being damaged by the fastening force of the nut 107 even if the axial thickness of the rotating shaft 103 of the impeller A120a is reduced. Can do.

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 rotates as indicated by the arrow in FIG. Rotate in direction Z.

  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 part 151 and the wing part A 126a of the impeller A 120a or between the wing part A 126a and the hub part A 123a, air leaks from the gap. Since the turbulence of the airflow occurs, the air blowing efficiency is lowered. However, in the present embodiment, since the ring portion 151, the wing portion A126a, and the hub portion A123a are integrally formed by die casting, it is possible to easily configure so that no gap is generated between the components. Therefore, it is possible to prevent a reduction in the blowing efficiency due to the turbulence of the air flow caused by the gap.

  Similarly, the rear shroud 124 and impeller B126b of the impeller B120b are integrally molded by injection molding, and the protrusion 143 of the impeller B126b is fitted into the groove 142 provided in the front shroud 125, and then heat welding is performed. As a result, it is possible not to form a gap between the rear surface shroud 124 and the blade portion B 126b but also between the blade portion B 126b and the front surface shroud 125. Therefore, even in the impeller B 120b, It is possible to prevent a reduction in the air blowing efficiency due to the turbulence of the air flow caused by the gap.

  Further, since the wing B126b of the impeller B120b is made of a resin having a high degree of freedom in shape, as shown in FIG. 3, the wing B126b can be formed in a complicated twisted shape with respect to the rear shroud 124. Yes. Therefore, by making the three-dimensional curved surface shape suitable for the airflow flowing through the impeller 120 over the entire surface of the wing B126b, it is possible to suppress the turbulence of the airflow inside the impeller 120 and increase the blowing efficiency. Yes.

  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. Then, the air again flows into the impeller 120 from the air inlet 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 the present embodiment, the fan case spacer 193 and the ring portion 151 are configured to contact each other, whereby the suction port 194 of the fan case 192 is replaced with the intake port 19 of the impeller 120.
5 is a contact-type seal structure, so that no reflux loss occurs and the 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 A 126a are made of aluminum having high thermal conductivity, and the ring portion 151 and the wing portion A 126a 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 part 151 to the wing part A126a and dissipated to the airflow, so that the resinous wing part B126b, the front shroud 125, and the fan case spacer 193 have sliding frictional heat. Therefore, it is possible to prevent deformation and damage. 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.

  In this embodiment, the fan case spacer 193 made of PTFE is attached to the fan case 192 with an adhesive. However, the fan case spacer 193 is made of 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 portion A 126a, 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 subjected to a force in the direction opposite to the rotation direction Z due to sliding frictional resistance, so the impeller A 120a formed integrally with the impeller B 120b It tries to shift in the direction opposite to the rotation direction Z. However, in the present embodiment, the stepped step portions 172a and 172b provided on the mating surfaces 171a and 171b between the wing portion A 126a and the wing portion B 126b are replaced with the suction surface 174 side of the wing portion B 126b, that is, the rotation direction Z. The impeller A 120a is prevented from shifting in the direction opposite to the rotation direction Z with respect to the impeller B 120b.

  Further, since the circumferentially mating surfaces 176a and 176b of the stepped portions 172a and 172b with respect to the rotation shaft 103 are configured so as to be combined with a substantially vertical surface without being tapered, the wing portion A126a is applied in the direction opposite to the rotational direction Z. Since the force is difficult to disperse in the axial direction with respect to the rotating shaft 103, the mating surfaces 171a and 171b are also prevented from being displaced in the axial direction.

  Here, a force is also applied to the wing B126b through the stepped portions 172a and 173a in the direction opposite to the rotation direction Z, but the wing B126b and the rear shroud 124 are integrally formed by injection molding and the wing B126b. Since the protrusion 143 is inserted into the groove 142 provided in the front shroud 125 and then fixed by applying a heat welding process, it has sufficient strength. The blade does not deform or break.

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 bracket 106 outer periphery 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 impeller A 120a is composed of aluminum, which is a metal having high thermal conductivity, and the downstream impeller B 120b is shaped with a degree of freedom of shape. It is made of a high resin material, and the air inlet 195 of the impeller 120 and the air inlet 194 of the fan case 192 have a contact-type seal structure, so that the air blowing efficiency is high and the seal portion can be Since the sliding frictional heat is radiated from the wing A126a of the impeller A120a, the resin parts such as the front shroud 125 are not deformed or damaged.

  Further, since impeller A 120a is provided with means for preventing the position of both impeller B 120b from rotating in the direction of rotating shaft 103 and the circumferential direction of rotating shaft 103, leakage loss due to displacement of blade section B 126b and blade section A 126a. And no loss due to turbulence.

(Embodiment 2)
9 and 10 show the impeller 201 according to the second embodiment.

  This embodiment is different from the first embodiment in that the wing part A202a of the impeller A201a and the mating surfaces 203a and 203b of the wing part B202b of the impeller B201b are on the suction surface 204 side on the outer peripheral side of the wing part B202b. A first stepped portion 206a, 206b configured to be provided with a convex portion 205, and a second stepped portion 209a configured to be provided with a convex portion 208 on the inner circumferential pressure surface 207 side of the wing B202b, The first stepped portion 206a and the first stepped portion 206b are configured such that the radial lengths of the first stepped portions 206a and 206b are longer than the radial lengths of the second stepped portions 209a and 209b. Is a point. Others are the same as those of the first embodiment, and the same numbers are assigned and detailed description is omitted.

  In the present embodiment, the first stepped portions 206a and 206b are provided on the mating surfaces 203a and 203b of the wing portions 202a and 202b, respectively, and the second stepped portions 209a and 209b are provided at the opposite positions. And the impeller B 201b, the first stepped portions 206a and 206b and the second stepped portions 209a and 209b are locked by the respective blade portions 202 so as not to be displaced from each other. And the wing B202b are not displaced and assembled.

  Here, the rotation of the impeller 201 causes the force applied to the pressure surface 207 of the wing portion 202 to be stronger on the outer peripheral side where the peripheral speed is faster, so a convex portion is formed on the negative pressure surface 204 side on the outer peripheral side in the wing portion B 202b. The first stepped portions 206a and 206b are configured to be longer than the second stepped portions 209a and 209b, so that the impeller A 201a is opposite to the rotation direction indicated by the arrow Z with respect to the impeller B 201b. This prevents it from shifting in the direction.

  Therefore, by configuring as described above, it is possible to avoid the problem that the air flow is disturbed due to the deviation of the impeller B 201b and the impeller A 201a and the blowing performance is reduced.

(Embodiment 3)
FIG. 11 shows a vacuum cleaner according to Embodiment 3 of the present invention.
In FIG. 11, the vacuum cleaner 301 has a hose 302, an extension pipe 303, and a suction tool 304 that moves on the floor surface and sucks dust, and the vacuum cleaner main body 306 is shown in the first embodiment. 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, in the electric blower according to the present invention and the vacuum cleaner using the electric blower, the impeller is constituted by two upper and lower parts, the upstream impeller A is constituted by aluminum which is a metal having high thermal conductivity, and the downstream. The impeller B on the side is made of a resin material with a high degree of freedom in shape, and the air intake port of the impeller and the suction port of the fan case are made into a contact-type seal structure, so that the air blowing efficiency is high and used at a high rotational speed. However, since the sliding frictional heat of the seal portion is radiated from the wing portion A of the impeller A, the resin parts such as the front shroud are not deformed or damaged. Further, since the impeller A is provided with means for preventing the position of the impeller B from deviating in both the rotation axis direction and the circumferential direction of the rotation axis, leakage loss and flow due to the deviation of the wing part B and the wing part A are provided. 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 107 Nut (fastening body)
120 impeller 120a impeller A
120b Impeller B
123a Hub A
123b Hub B
124 Rear shroud 125 Front shroud 126a Wing A
126b Wing B
151 Ring part 171a Mating surface 171b Mating surface 172a Step part (engagement part)
172b Step part (engagement part)
173a mating surface 173b mating surface 174 negative pressure surface 175 convex portion 176a mating surface 176b mating surface 181a taper portion 181b taper portion 182a engaging portion 182b engaging portion 184 upper surface portion 185 lower surface portion 192 fan case 194 air inlet 201 195 suction port 195 Impeller A
201b Impeller B
202a Wing A
202b Wing B
203a mating surface 203b mating surface 204 negative pressure surface 205 convex portion 206a first step portion (engagement portion)
206b First step portion (engagement portion)
207 Pressure surface 208 Convex part 209a Second step part (engagement part)
209b Second step portion (engagement portion)
301 Electric vacuum cleaner 307 Impeller 308 Electric blower

Claims (6)

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 impeller A made of a metal material,
It is composed of a downstream impeller B made of a resin material,
The impeller B is
A front shroud,
A rear shroud that is spaced apart from the front shroud and has a hub portion B;
It is composed of a plurality of wings B sandwiched between the pair of shrouds,
The impeller A is
A plurality of wing parts A;
It is composed of an outer peripheral ring portion and an inner peripheral hub portion A that are in contact with at least a part of these wing portions A,
The wing portion A and the wing portion B are provided with engaging portions on respective mating surfaces,
The hub part A is inserted into the outer periphery of the hub part B, and the impeller B is fixed to the rotating shaft from the upper part of the hub part B by a fastening body, whereby the blade part B and the blade part A are engaged with the engagement part. And connected with
The hub portion A is arranged so that the upper surface portion of the hub portion A is in contact with and covered with the lower surface portion of the fastening body so that the movement in the rotation axis direction is restricted, and
An electric blower in which an intake port of the impeller and a suction port of the fan case are configured as a contact seal. The electric blower according to claim 1, wherein the engaging portion is a stepped portion configured such that a convex portion is provided on the suction surface side in the wing portion B. The engaging portion includes a first step portion configured such that a convex portion is provided on the suction surface side on the outer peripheral side in the wing portion B, and a convex portion is provided on the pressure surface side on the inner peripheral side in the wing portion B. The electric blower according to claim 1, wherein the electric blower is a configured second stepped portion. The electric blower according to any one of claims 1 to 3, wherein a mating surface of the engaging portion in a circumferential direction with respect to the rotation shaft is configured to be substantially vertical. An uneven engagement portion having a tapered portion is formed on the mating surface in the rotation axis direction of the hub portion A and the hub portion B, and the upper end surface is higher than the engagement portion provided on the mating surface of the wing portion A and the wing portion B. The electric blower of any one of Claims 1-4 provided so that it might become high. The vacuum cleaner which has an electric blower of any one of Claims 1-5.