JP2010281232A - Electric blower and vacuum cleaner having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric blower miniaturized and having a high air blowing performance and a vacuum cleaner in which the electric blower is used. <P>SOLUTION: This electric blower includes an impeller 2 having a mixed flow blade 2a, an electric motor 6 for driving a rotating shaft 5 to which the impeller 2 is secured, a plurality of first guide vanes 7a for guiding the airstream generated at the impeller 2 to the outer periphery of the motor case 6a of the electric motor 6, a plurality of second guide vanes 7b which are arranged on the outer periphery of the motor case 6a in the circumferential direction and formed integrally with the motor case 6a, and an air guide outer shell 9a which configures, on the outer periphery of the motor case 6a, a plurality of air passages extending from the impeller 2 to the outside of the electric motor 6 by covering the plurality of first guide vanes 7a and the plurality of second guide vanes 7b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric blower that is small and has high blowing performance and can efficiently cool an electric motor, and an electric vacuum cleaner using the electric blower.

  Conventionally, this type of electric blower has been widely used in household vacuum cleaners (see, for example, Patent Document 1). The input power of the vacuum cleaner is limited, and it is necessary to improve the blowing performance of the electric blower in order to obtain a stronger suction force. At the same time, from the viewpoint of easy cleaning, it is desired that the vacuum cleaner body has a small turn, and it is necessary to reduce the size of the electric blower.

  FIG. 10 is a diagram showing a cross-sectional configuration of a conventional electric blower described in Patent Document 1. As shown in FIG. An impeller 28 having a mixed flow type blade 27, an air guide 29 disposed on the downstream side of the impeller 28, an electric motor 30 having the impeller 28 fixed to the shaft end of the rotating shaft 31, and a shaft end of the rotating shaft 31. An electric blower 33 including the hub 32 is disclosed.

JP 2005-307985 A

  However, in the conventional configuration, the air guide 29 is configured by a single component, and the shape and length of the stationary blade that is removed by the mold during resin molding is restricted, and the air path formed by the stationary blade of the air guide 29 It was difficult to ensure a sufficient length.

  However, in order to convert the dynamic pressure of the airflow generated by the impeller 28 into a static pressure, the airway cross-sectional area must be expanded rapidly with a short airway length. However, if it did in that way, the pressure loss will become large and the subject that the ventilation performance of the electric blower 33 will fall occurred.

  This invention solves the said conventional subject, and it aims at providing the electric blower which can cool an electric motor efficiently with a small and high ventilation performance, and a vacuum cleaner using the same. .

  In order to solve the conventional problems, an electric blower of the present invention includes an impeller having a mixed flow type blade, an electric motor that drives a rotating shaft to which the impeller is fixed, and an air flow generated by the impeller. A plurality of first guide vanes guided on the outer periphery of the motor case, a plurality of second guide vanes arranged in a circumferential direction of the outer periphery of the motor case and integrally formed with the motor case; An air guide outer shell that covers the first guide vanes and the plurality of second guide vanes and includes a plurality of air passages that are connected to the outside of the motor from the impeller on the outer periphery of the motor case.

  As a result, the airflow generated by the impeller is smoothly guided to the air guide air passage, and the air guide air passage length of the air guide can be sufficiently secured by connecting the first guide blade and the second guide blade. The dynamic pressure of the airflow can be sufficiently converted to static pressure. Further, since the heat of the electric motor can be radiated by the second guide blade integrally formed with the motor case, it is possible to realize an electric fan that has a small size and high air blowing performance and can efficiently cool the electric motor.

  In addition, since the electric vacuum cleaner of the present invention is equipped with an electric blower that is small and has high air blowing performance, it has a strong suction force and good dust removal, and since the electric blower is lightweight, it is easy to use with a small turn. Is a good vacuum cleaner.

  The electric blower of the present invention can sufficiently convert the dynamic pressure of the airflow into the static pressure by connecting the first guide vane and the second guide vane to ensure a sufficient air path length of the air guide. Small size and high air blowing performance can be obtained. Further, since the heat of the electric motor can be radiated by the second guide blade integrally formed with the motor case, it is possible to realize a small electric fan that has high air blowing performance and can efficiently cool the electric motor.

  Moreover, the vacuum cleaner using such an electric blower has a strong suction force, good dust removal, and a lightweight electric blower, so it is easy to use with a small turn.

The partial cross section figure of the electric blower in the 1st Embodiment of this invention Partial sectional perspective view of the electric blower Partial cross-sectional perspective view of the impeller of the electric blower Schematic diagram showing the meridian shape of the electric blower Exploded perspective view of the electric blower Sectional drawing showing the structure of the vacuum cleaner using the electric blower Partial sectional drawing of the electric blower in the 2nd Embodiment of this invention Partial sectional perspective view of the electric blower Exploded perspective view of the electric blower Cross section of a conventional electric blower

  According to a first aspect of the present invention, there is provided an impeller having a mixed flow type blade, an electric motor that drives a rotating shaft to which the impeller is fixed, and a plurality of first electric guides that guide an airflow generated by the impeller onto a motor case outer periphery of the electric motor. A plurality of second guide vanes arranged in the circumferential direction of the outer periphery of the motor case and integrally formed with the motor case, the plurality of first guide vanes, and the plurality of second The air blower is provided with an air guide outer shell that forms a plurality of air passages that are connected to the outside of the motor from the impeller on the outer periphery of the motor case.

  As a result, the airflow generated by the impeller is smoothly guided to the air guide air passage, and the air guide air passage length of the air guide can be sufficiently secured by connecting the first guide blade and the second guide blade. The dynamic pressure of the airflow can be sufficiently converted to static pressure. Further, since the heat of the electric motor can be radiated by the second guide blade integrally formed with the motor case, it is possible to realize a small electric fan that has high air blowing performance and can efficiently cool the electric motor.

  In the second invention, in particular, the second guide vanes of the first invention are continuously reduced in thickness from the upstream side to the downstream side. The cross-sectional area can be continuously increased from the upstream to the downstream, and a small air guide with high static pressure conversion efficiency can be configured.

In the third aspect of the invention, in particular, the air guide outline of the first or second aspect of the invention is continuously thinned from the upstream side to the downstream side, so that the thickness of the second guide blade is not changed. The air guide cross-sectional area of the air guide can be continuously increased from upstream to downstream,
A small diffuser with high static pressure conversion efficiency can be easily configured, and an electric blower having high blowing performance can be obtained.

  In the fourth aspect of the invention, in particular, the air guide outline of any one of the first to third aspects of the present invention continuously increases the outer diameter from the upstream side to the downstream side. The air guide air passage cross-sectional area can be adjusted according to the outer diameter of the air guide, can be easily configured, and can be an electric blower having high air blowing performance. .

  In the fifth aspect of the invention, in particular, since the plurality of second guide vanes of any one of the first to fourth aspects are spirally arranged on the outer periphery of the motor case, the outer length of the limited air guide is limited. In addition, the air path that can be used as a diffuser can be lengthened, the heat dissipation area can be expanded to improve the cooling performance of the motor, and the sound insulation effect against noise propagating through the air path can be improved. It can be set as the electric blower which has high ventilation performance, aiming at noise reduction.

  In particular, in the sixth invention, in any one of the first to fifth inventions, by providing the contact resistance reducing means on the contact surface between the air guide and the electric motor, the thermal conductivity between the electric motor and the air guide is improved. The heat generated when the motor is improved is conducted to the air guide arranged on the outer periphery of the motor, and the heat dissipation area can be expanded and the motor can be efficiently cooled by the airflow flowing through the air guide air passage. .

  In particular, the seventh aspect of the invention is a vacuum cleaner equipped with any one of the first to sixth electric blowers, so that it has a strong suction force and good dust removal, and the main body size is small, so that it is easy to turn. It becomes a convenient vacuum cleaner.

  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)
FIGS. 1-5 shows the structure of the electric blower in Embodiment 1 of this invention, FIG. 1 is a partial cross section figure of the electric blower, and FIG. 2 is a partial cross section perspective view of the electric blower. 3 is a partial cross-sectional perspective view of an impeller used in the electric blower, FIG. 4 is a schematic view showing a meridional shape of the electric blower, and FIG. 5 is an exploded view of an air guide of the electric blower. FIG. 6 is a cross-sectional view showing a configuration of a vacuum cleaner using the electric blower.

  As shown in FIGS. 1 to 3, the electric blower 1 a includes an impeller 2 having six mixed flow blades 2 a formed in a three-dimensional curved surface, and an electric motor 6 that drives a rotating shaft 5 to which the impeller 2 is fixed. The guide vanes 7a and 7b are provided with guide vanes 7a and 7b that form an air path with the built-in guide vanes 7a and 7b and guide the airflow A generated by the impeller 2 and flow along the outer periphery of the electric motor 6. Is covered with a fan case 13, and the tip of the impeller 2 and the fan case 13 are sealed with a ring 15 of PTFE resin.

  As shown in FIGS. 1 and 2, the electric motor 6 houses the rotor 3 and the stator 4 disposed on the outer periphery of the rotor 3 in a cylindrical motor case 6 a. A part of the rotating shaft 5 connected to the rotor 3 protrudes from the motor case 6a, and the impeller 2 is fixed to that part.

As shown in FIG. 4, the air guide 9 has an inlet surface 12 substantially parallel to a surface 11 obtained by rotating the outlet portion 10 of the impeller 2 on the meridian surface around the rotation axis 5 by 360 degrees. The surface is parallel to the surface of the outlet portion 10 of the impeller 2.

  As shown in FIGS. 1, 2, and 5, the air guide 9 is in contact with the circumferential surface of the cylindrical motor case 6 a and is curved along the outer periphery, and the entire configuration is cylindrical. In the air guide 9, a plurality of air passages 8a and 8b are formed by dividing a space between the air guide outer shell 9a and the motor case 6a by a plurality of guide blades 7a and 7b. 8b functions as a diffuser.

  The first guide vane 7b and the motor case 6a are integrally formed of a heat conductive resin, and the plurality of guide vanes 7b are arranged in the circumferential direction of the motor case 6a so that the longitudinal direction is the axial direction. It has been configured.

  The first guide vane 7a located in front of the air guide 9 is provided between the second guide vane 7b and the impeller 2, and is arranged corresponding to the arrangement of the plurality of guide vanes 7b. An air passage 8a is formed by partitioning a space between the guide outer shell 9a. By covering the plurality of guide vanes 7a and the plurality of guide vanes 7b with the air guide 9, a plurality of air passages 8a and 8b communicating from the inlet surface 12 of the air guide 9 to the outside are smoothly configured. The first guide vanes 7 a are arranged radially on the outer periphery of the impeller 2 and are used to guide the airflow generated by the impeller 2 to the outer periphery of the electric motor 6. Thermally conductive grease is applied to the contact surface 16 between the air guide 9 and the motor case 6a to improve the thermal conductivity by improving the adhesion.

  The second guide vane 7b located at the rear is spirally disposed on the outer periphery of the motor case 6a, and is used to increase the air path length of the air guide 9. Further, the guide vane 7b is configured so that the thickness continuously decreases from the upstream side to the downstream side of the air passage 8b, and the static pressure conversion efficiency is increased by continuously increasing the air passage cross-sectional area of the air guide. It is increasing.

  In FIG. 6, the vacuum cleaner 16 a includes a vacuum cleaner main body 21 having a dust collection chamber 18 communicating with the main body intake port 17 and a blower chamber 20 having a main body exhaust port 19, and a main body intake port 17 in the dust collection chamber 18. A dust bag 22 that is airtightly mounted, an electric blower 1 a installed in the blower chamber 20, a soundproof cover 23 made of a flame-retardant resin that covers the electric blower 1 a, and a sound absorbing material disposed above and below the blower chamber 20. 24. Although not shown, a hose and an extension pipe are sequentially connected to the main body inlet 17, and a nozzle for sucking dust on the floor is attached to the tip of the extension pipe.

  About the electric blower comprised as mentioned above and the vacuum cleaner 16a using the same, the operation | movement and an effect | action are demonstrated below.

  First, the operation of the electric blower will be described. In FIG. 1, when input power is supplied to the motor 6, a magnetic field is generated in the stator 4 and the rotor 3, the rotor 3 is rotated by electromagnetic force, and the impeller 2 fixed to the rotating shaft 5 is rotated. . Due to the centrifugal force generated by the rotation of the impeller 2, the air in the impeller 2 is pushed to the outer periphery of the impeller 2 and rearward, the impeller 2 becomes negative pressure, and an airflow A flowing into the impeller 2 from the front is generated. .

  The airflow A flows in the axial direction from the inlet of the impeller 2, flows along the six mixed flow blades 2 a, and then flows out of the impeller 2 at an intermediate angle between the axial direction and the radial direction. The airflow flowing out from the impeller 2 flows into the inlet surface 12a of the air guide 9, flows through the air passage 8a formed by the guide vanes 7a, is guided to the outer periphery of the electric motor 6, and then the air passage at the rear of the air guide 9 that communicates. It passes through 8b and flows out of the electric blower 1a.

The air guide 9 has an inlet surface 12 that is substantially parallel to a surface 11 obtained by rotating the outlet portion 10 of the impeller 2 on the meridian surface 360 degrees around the rotation axis 5, and between the impeller 2 and the air guide 9. Therefore, the air flow generated by the impeller 2 can smoothly flow into the air guide 9.

  The air passage formed by the second guide vane 7b integrally formed on the outer periphery of the motor case 6a and the air guide outer shell 9a covering the outer peripheral side of the second guide vane 7b is the second guide vane. Since the thickness of 7b continuously decreases from upstream to downstream, the cross-sectional area of the air passage continuously increases toward the downstream, and the airflow flowing into the air guide 9 gradually decreases the flow velocity, Pressure is converted to static pressure.

  By connecting the second guide vane 7b integrally formed with the motor case 6a and the first guide vane 7a to form a long air passage, the flow velocity of the airflow can be sufficiently reduced. In addition, the guide wing 7a and the guide wing 7b are configured to be divided so that they can be easily removed from the mold after resin molding, the curvature limitation of the curved shape that can be manufactured by the mold is reduced, and the static pressure recovery is high. The diffuser can be easily resin-molded.

  Further, in the electric motor 6, heat is generated due to Joule heat of the built-in coil and viscous friction of the rotating shaft 5. Therefore, the rear guide vane 7b and the motor case 6a are integrated so that the heat in the electric motor 6 is easily transmitted to the guide vane 7b. Therefore, the heat of the electric motor 6 is transported to the outside of the electric motor 6 by the airflow passing through the air passage 8b configured by the second guide vanes 7b, and the electric motor 6 is efficiently cooled. That is, the guide vanes 7b integrally formed with the motor case 6a function efficiently as heat radiating fins.

  As the material of the air guide 9, it is preferable to select a material having high heat conductivity. In addition to the heat conductive resin, a metal material such as aluminum or copper excellent in heat conductivity may be used. The heat can be transmitted to the air guide 9 to increase the heat radiation area, and the effect of cooling the motor 6 can be enhanced.

  Thermally conductive resin is a resin with improved thermal conductivity by containing a filler (filler) such as metal or carbon powder or fiber with high thermal conductivity in the resin. Polyphenylene sunfide resin ( PPS), nylon and liquid crystal polymers (LCP) are known. When the blending ratio of the filler is increased, the viscosity at the time of melting is increased and the moldability is lowered. Therefore, the optimum blending ratio may be obtained experimentally.

  Furthermore, by applying thermally conductive grease to the contact surface between the air guide 9 and the electric motor 6, the thermal contact resistance at the contact surface is reduced, and the thermal conductivity from the electric motor 6 to the air guide 9 is improved. To do. That is, the cooling effect of the electric motor 6 can be improved by effectively utilizing the air guide 9 formed on the outer periphery of the electric motor 6 as a radiator.

  When the air flow generated by the impeller 2 flows into the air guide 9, the air flow has a large flow velocity and turbulence, so the effect of removing heat from the air guide 9 is high, and the guide blades integrated with the motor case 6 a The cooling effect of the electric motor 6 can be improved by utilizing not only 7b but the whole air guide 9 as a heat radiator.

  Next, operation | movement of a vacuum cleaner is demonstrated using FIG. In FIG. 6, when the impeller 2 of the electric blower 1 a rotates, the dust collection chamber 18 is in a negative pressure state, and an air flow including dust sucked from a nozzle (not shown) passes through the main body intake port 17 to collect the dust. It flows into the chamber 18. The clean airflow filtered and separated by the dust bag 22 flows into the impeller 2 of the electric blower 1a, passes through the air guide 9, and then flows out from the exhaust port of the soundproof cover 23 to the outside of the cleaner body 21. Released.

  Since the electric vacuum cleaner 16a is equipped with an electric blower 1a that is small and has high blowing performance, it has a strong suction force, good dust removal, and the electric blower 1a has a small main body size and light weight. Easy to use with a small turn. Further, the space in which the sound absorbing material 24 can be arranged in the cleaner body 21 is expanded, and the installation area of the sound absorbing material 24 provided in the cleaner body 21 is increased, so that the electric vacuum cleaner 16a with low operation sound is obtained. It is also possible.

  As described above, in the present embodiment, the air passage of the diffuser is formed by the guide vanes 7a of the air guide 9 and the guide vanes 7b integrated with the motor case 6a, and the outlet portion 10 of the impeller 2 and the air guide 9 are formed. By making the inlet surface 12a substantially parallel, the air flow generated by the impeller 2 can be smoothly guided to the air path formed by the guide vanes 7a of the air guide 9. By configuring the second guide vane 7b in a spiral shape on the outer periphery of the motor case 6a, it is possible to ensure a sufficient air path length and to make the air guide 9 with high static pressure recovery. Further, by forming the air passage of the diffuser with the guide vanes 7b integrated with the motor case 6a and using the air guide 9 as a radiator of the electric motor 6, the electric motor 6 can be efficiently cooled.

  In the present embodiment, the thickness of the guide vane 7a of the air guide 9 is described as being thinned from the upstream side to the downstream side of the air passage 8b. However, the thickness of the air guide outer shell is kept constant while the thickness of the guide vane is kept constant. May be implemented by thinning from upstream to downstream of the air path, and the same effect can be obtained.

  In the above-described embodiment, the air guide outline 9a, the first guide vane 7a, and the inlet guide 14 have been described as being integrally molded with a heat conductive resin. However, the present invention is not limited to this. It may be in the form of a modified example described.

(Modification 1)
The basic configuration of the electric blower according to the first modification of the first embodiment is the same as that of the first embodiment described above, but the component that integrally molds the first guide vane 7a is the first. Different from the embodiment. The inlet guide 14 and the first guide vane 7a are integrally formed of a heat conductive resin, and the first guide vane 7a and the air guide outer shell 9a are divided.

  Specifically, the first part in which the inlet guide 14 and the first guide vane 7a are integrally formed with a heat conductive resin, and the motor case 6a and the second guide vane 7b are integrally formed with a heat conductive resin. After the first component is prepared in advance, the rotor 3 and the stator 4 connected to the rotary shaft 5 are internally provided in the motor case 6a, and the inlet guide 14 and the motor are integrally formed with the first guide vanes 7a. The case 6a is aligned.

  At this time, since the first guide vane 7a and the second guide vane 7b are aligned at the same time, the alignment between the guide vanes 7a and 7b and the alignment between the inlet guide 14 and the motor case 6a can be easily performed. Is called. Thereafter, the impeller 2 is mounted on the shaft tip of the rotating shaft 5 protruding from the inlet guide 14, and the air guide outer shell 9a is mounted on the outer periphery of the first guide blade 7a and the second guide blade 7b. The front portion of the air guide 9 is covered with the fan case 13 to complete the assembly of the electric blower 1a.

  In the first modification, since the electric blower 1a is configured by using a part in which the inlet guide 14 and the first guide vane 7a are integrally formed, the first guide vane 7a and the second guide vane when the electric blower 1a is assembled. 7b and guide blades 7a and 7b can be easily aligned, and can be configured smoothly without causing positional deviation of the plurality of air passages 8a and 8b, with little pressure loss and good blowing performance. A simple electric blower can be manufactured.

(Modification 2)
The basic configuration of the electric blower according to the second modification of the first embodiment is the same as that of the first embodiment described above, but the component that integrally molds the first guide vane 7a is the first. Different from the embodiment. The air guide shell 9a and the first guide vane 7a are integrally formed of a heat conductive resin, and the first guide vane 7a and the inlet guide 14 are divided.

  Specifically, the first part in which the air guide 9a and the first guide vane 7a are integrally formed with a heat conductive resin, and the motor case 6a and the second guide vane 7b are integrally formed with a heat conductive resin. After preparing the second part and the third part in which only the inlet guide 14 is resin-molded, the rotor 3 and the stator 4 connected to the rotary shaft 5 are installed inside the motor case 6a, and the inlet The guide 14 and the motor case 6a are aligned to fix the inlet guide 14 to the motor case 6a.

  Thereafter, the alignment of the air guide shell 9a integrally formed with the first guide vane 7a and the motor case 6a and the alignment of the first guide vane 7a and the second guide vane 7b are simultaneously performed. Since the alignment surfaces of the first guide vane 7a and the second guide vane 7b are provided with alignment irregularities, the guide vanes 7a and 7b can be easily aligned. After that, the impeller 2 is mounted on the shaft tip of the rotating shaft 5 protruding from the inlet guide 14, and the impeller 2 and the front portion of the air guide 9 are covered with the fan case 13 to complete the assembly of the electric blower 1a.

  In the second modification, only the first part in which the air guide outer shell 9a and the first guide vane 7a are integrally molded, the second part in which the motor case 6a and the second guide vane 7b are integrally molded, and the inlet guide 14 only. Since the air guide 9 is configured by assembling the parts divided into the three parts of the resin molded third part, the die cutting when the three parts are resin molded is the above-described first embodiment. It is easy compared. In addition, since the alignment surface is provided with unevenness on the joint surface between the first guide blade 7a and the second guide blade 7b, the air guide 9 can be easily assembled, and the positions of the plurality of air passages 8a and 8b. An electric blower that can be configured smoothly without causing a shift, has little pressure loss, and has good blowing performance can be manufactured.

(Embodiment 2)
7 is a partial cross-sectional view showing the configuration of the electric blower according to Embodiment 2 of the present invention, FIG. 8 is a partial cross-sectional perspective view of the electric blower, and FIG. 9 is an exploded perspective view of the electric blower. It is. The same elements as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In FIG. 7, the electric blower 1b has a third guide blade 7c formed integrally with the motor case 6a, and the third guide blade 7c is formed in a spiral shape on the outer periphery of the motor case 6a. By connecting to the guide vanes 7a, the air passages 8c and 8d of the air guide 26 are formed smoothly. The connecting portion between the first guide vane 7a and the third guide vane 7c is provided with fitting irregularities, and the irregularities are fitted and bonded. Further, the outer shell 26a of the air guide 26 covering the third guide vane 7c has a continuously increasing outer diameter from the upstream side to the downstream side of the air passage 8d.

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

  First, when the electric motor 6 is driven, the impeller 2 fixed to the rotating shaft 5 rotates, and an airflow A flowing into the impeller 2 as indicated by an arrow is generated by centrifugal force. The airflow flowing out of the impeller 2 flows into the air guide 26, flows through the air passage 8c formed by the guide vanes 7b, is guided to the outer periphery of the motor 6, and then is guided by the third guide vanes 7c integrated with the motor case 6a. It passes through the formed air passage 8d and flows out of the electric blower 1b.

The air guide 26 moves the outlet 10 of the impeller 2 on the meridian surface 360 around the rotation axis 5.
It has an inlet surface 12b that is substantially parallel to the surface 11 that has been rotated by a predetermined angle, and is close to the outlet portion 10 of the impeller 2 and the inlet surface 12b, thereby reducing air leakage between the impeller 2 and the air guide shell 26a. At the same time, it can smoothly flow into the air guide 26.

  Further, since the outer diameter of the air guide outline 26a continuously increases from the upstream side to the downstream side of the air passage 8d, the cross-sectional area of the air passage continuously increases from the upstream side to the downstream side. The flow velocity is gradually reduced, and the dynamic pressure of the airflow is converted to static pressure.

  Since the third guide vane 7c integrated with the motor case 6a is formed in a spiral shape on the outer periphery of the motor case 6a, the air passage 8d can be lengthened even in the limited outer length of the air guide 26. The static pressure recovery function as a diffuser can be greatly improved.

  Further, since the air passage of the air guide 26 is divided into a front portion and a rear portion, and the rear air passage 8d is formed by the air guide outline 26a and the third guide blade 7c, the third guide blade 7c. Therefore, it can be manufactured by a method using a mold such as injection molding or die casting.

  Further, in the air passages 8c and 8d formed by the guide blades 7c and 7d and the air guide outer shell 26a covering the outer peripheral side of the guide blades 7c and 7d, the third guide having a spiral shape against the noise propagating through the air. Since the wing 7c serves as a sound insulation wall, noise radiated to the cleaner body 22 is reduced. As a result, since the noise of the electric blower that is the sound source of the vacuum cleaner 16a can be reduced, the operation sound as the vacuum cleaner 16a can be greatly reduced.

  As described above, in this embodiment, the air guide outer wall 26a and the helical guide-shaped third guide blade 7c integral with the motor case 6a form the diffuser air passage 8d. Even with the outer length of 6, the air passage 8d as the diffuser can be lengthened, and the heat radiation area can be expanded to improve the cooling performance of the electric motor 6. Further, by dividing the front air passage 8c and the rear air passage 8d, the diffuser having low noise and high static pressure recovery can be easily formed by resin molding with a mold, and has high air blowing performance. It can be an electric blower.

  Note that the configurations of the first and second embodiments described above are not limited to this, and can be appropriately combined as necessary.

  As described above, the electric blower according to the present invention has a small size by smoothly flowing the airflow generated by the impeller having a mixed flow type blade to the air passage of the air guide constituted by a plurality of divided parts. Since it has high air blowing performance, it can be applied to household vacuum cleaners as well as home appliances.

DESCRIPTION OF SYMBOLS 1a, 1b Electric blower 2 Impeller 2a Blade 5 Rotating shaft 6 Electric motor 6a Motor case 7a, 7b Guide vane 8a, 8b Air passage 9 Air guide 9a Air guide outline 10 Outlet part 12a Inlet surface 13 Fan case 14 Inlet guide 16a Electric vacuum cleaner 26 Air guide 26a Air guide outline

Claims (7)

An impeller having a mixed flow type blade; an electric motor that drives a rotating shaft to which the impeller is fixed; a plurality of first guide vanes that guide an airflow generated by the impeller onto an outer periphery of a motor case of the electric motor; and the motor A plurality of second guide vanes arranged in a circumferential direction of the outer periphery of the case and integrally formed with the motor case, and the plurality of first guide vanes and the plurality of second guide vanes are covered. An electric blower provided with an air guide outer shell constituting a plurality of air passages connected from the impeller to the outside of the motor on the outer periphery of the motor case. The electric blower according to claim 1, wherein the second guide vanes have a thickness that is continuously reduced from upstream to downstream. The electric blower according to claim 1 or 2, wherein the air guide outer shell is made thinner continuously from upstream to downstream. The electric blower according to any one of claims 1 to 3, wherein the air guide outer shell continuously increases in outer diameter from upstream to downstream. The electric blower according to any one of claims 1 to 4, wherein the plurality of second guide vanes are spirally disposed on an outer periphery of the motor case. The electric blower according to any one of claims 1 to 5, wherein the air guide is provided with contact resistance reducing means on a contact surface with the electric motor. The vacuum cleaner carrying the electric blower of any one of Claims 1-6.