JP2010185289A - Electric blower and vacuum cleaner using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric blower inhibiting drop of blasting performances and providing high sound attenuation effect, and a vacuum cleaner using the same. <P>SOLUTION: The electric blower 1a includes an electric motor 4, an impeller 6 fixed on a rotary shaft 5 of the electric motor 4, an air guide 10 including an air duct 8 formed by a stationary blade 7 at an outer circumference part of an impeller 6, a fan case 13 including a discharge port 12 and covering the impeller 6 and the air guide 10, and a sound insulation cover 14 covering the outer circumference surface of the fan case 13. The urethane material 15a having three dimensional skeleton structure and felt 16 are disposed and piled between the fan case 13 and the sound insulation cover 14. Noise of the impeller 6 is largely absorbed by the felt 16 after transmitting in a skeleton structure of the urethane material 15a. The urethane material 15a inhibits expansion loss due to rapid expansion of air current from a discharge port 12 and reduces pressure loss in an exhaust gas channel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric blower having low noise and high blowing performance, and a vacuum cleaner using the electric blower.

  Conventionally, this type of electric blower has been widely used for household vacuum cleaners (see, for example, Patent Document 1). In order to increase the suction force of the vacuum cleaner, it is necessary to improve the blowing performance of the electric blower. On the other hand, it is also required to reduce the noise of the electric blower and improve the usage environment of the vacuum cleaner.

FIG. 8 is a cutaway front view showing a configuration of a conventional electric blower described in Patent Document 1. As shown in FIG. In Patent Document 1, a motor unit 25, a centrifugal fan 26 driven by the motor unit 25, an air guide 27 that rectifies blown air from the centrifugal fan 26 and guides it to the motor unit 25, and a fan that covers the fan unit And an exhaust hole 29 through which a part of the air sent from the centrifugal fan 26 is directly discharged to the outside. A cylindrical soundproof cover is provided at a distance from the exhaust hole 29. An electric blower 32 in which a sound absorbing material 31 is filled in a gap between the soundproof cover 30 and the fan casing 28 is disclosed.
JP 2004-116450 A

  However, in the conventional configuration, since the sound absorbing material 31 has almost no air permeability, a sufficient flow path of the air blown out from the fan casing 28 cannot be secured, and the blowing performance of the electric blower 32 is deteriorated. There was a problem. Further, if a distance is provided between the fan casing 28 and the sound absorbing material 31, the noise of the centrifugal fan 26 easily propagates after exiting the fan casing 28, and the blowing sound generated when blowing out from the exhaust hole 29 on the outer periphery of the fan casing 28. Therefore, it is difficult to realize the electric blower 32 having low noise and high blowing performance.

  This invention solves the said conventional subject, and it aims at providing the electric blower which has high ventilation performance with low noise, and a vacuum cleaner using the same.

  In order to solve the above-described conventional problems, an electric blower of the present invention includes an electric motor, an impeller fixed to a rotating shaft of the electric motor, an air guide that forms a ventilation path on an outer peripheral portion of the impeller, and an exhaust on an outer periphery. A fan case having a mouth and covering the impeller and the air guide; and a soundproof cover for covering an outer peripheral surface of the fan case; and a three-dimensional skeleton structure urethane material and a sound absorbing material, and the fan case and the It is placed between the soundproof cover.

  Thereby, the noise generated by the rotation of the impeller is significantly absorbed by the sound absorbing material after propagating through the skeleton structure of the urethane material. Moreover, since the noise transmitted through the sound absorbing material is sound-insulated by the soundproof cover, a significant silencing effect can be obtained. In addition, the air current discharged from the exhaust port of the fan case can be prevented from rapidly expanding at the exhaust port due to the presence of the urethane material having a three-dimensional skeleton structure. Moreover, since the urethane material having a three-dimensional skeleton structure through which air from the exhaust port passes has a small airflow pressure loss, a significant silencing effect can be obtained without deteriorating the blowing performance of the electric blower.

  Moreover, since the vacuum cleaner of this invention is equipped with the electric blower which has a low noise and high ventilation performance, the driving sound at the time of cleaning is small, and it has a strong suction force and can be used comfortably.

  The electric blower of the present invention stacks a urethane material having a three-dimensional skeleton structure with a sound absorbing material and arranges it between the fan case and the soundproof cover, thereby reducing the ventilation pressure loss and reducing the blowing performance of the electric blower. , Can obtain a significant silencing effect.

  Moreover, since the vacuum cleaner of this invention is equipped with the electric blower which has a low noise and high ventilation performance, the driving sound at the time of cleaning is small, and it has a strong suction force and can be used comfortably.

  The first invention includes an electric motor, an impeller fixed to a rotating shaft of the electric motor, an air guide that forms a ventilation path in an outer peripheral portion of the impeller, an exhaust port on the outer periphery, the impeller and the air guide A fan case that covers the outer peripheral surface of the fan case, and an electric blower that is disposed between the fan case and the soundproof cover by laminating a urethane material having a three-dimensional skeleton structure and a sound absorbing material. It is a thing.

  As a result, the noise generated by the rotation of the impeller is significantly absorbed by the sound absorbing material after propagating through the skeleton structure of the urethane material. Moreover, since the noise transmitted through the sound absorbing material is sound-insulated by the soundproof cover, a significant silencing effect can be obtained. Also, since the airflow that flows out from the exhaust port of the fan case flows into the urethane skeleton structure, sudden expansion of the airflow immediately after the exhaust port is suppressed, expansion loss is reduced, and a skeleton structure with low airflow pressure loss is achieved. Since it passes, the blowing performance of the electric blower does not deteriorate.

  In the second invention, in particular, the urethane material of the three-dimensional skeleton structure according to the first invention covers the outer periphery of the fan case, the sound absorbing material covers the outer periphery of the urethane material, and the urethane material becomes the outer peripheral side. Since the gap in the three-dimensional skeleton structure is increased, the flow path in the skeleton structure of the urethane material is increased stepwise or continuously, so the flow velocity of the airflow discharged from the fan case exhaust port is reduced. The urethane material can serve as a diffuser for converting the dynamic pressure generated by the impeller into a static pressure, and the blowing performance of the electric blower can be improved.

  In the third invention, in particular, the sound absorbing material of the first or second invention has an uneven shape on the surface facing the fan case, thereby increasing the sound absorbing area of the sound absorbing material with a limited size. This makes it possible to improve the sound absorption effect.

  In the fourth invention, in particular, in the first or second invention, the sound absorbing material forms a flow path corresponding to each exhaust port of the fan case, so that the flow path from the exhaust port of the fan case is smooth. At the same time, the sound absorption area can be greatly increased, and the blowing performance of the electric blower can be improved to reduce noise.

  In the fifth aspect of the invention, in particular, by using the electric blower using the electric blower of any one of the first to fourth aspects of the invention, low noise and high blowing performance can be obtained, so that the operation sound during cleaning is small. It has a strong suction force and can be used comfortably.

  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)
FIG. 1 is a cutaway front view showing the configuration of the electric blower according to Embodiment 1 of the present invention.
FIG. 3 is a perspective view in which a part of the electric blower is broken, FIG. 3 is a cross-sectional view showing a configuration of an impeller and an air guide of the electric blower, and FIG. 4 is an electric vacuum cleaner using the electric blower of the present invention. It is sectional drawing which shows a structure.

  As shown in FIGS. 1 to 3, the electric blower 1 a includes an electric motor 4 having a rotor 2 and a stator 3, an impeller 6 fixed to a rotary shaft 5 that is an output shaft of the electric motor 4, and an outer periphery of the impeller 6. An air guide 10 having a ventilation passage 8 and a return passage 9 formed by a stationary blade 7 in the part, a fan case 13 having an intake port 11 in the center and an exhaust port 12 in the outer peripheral portion and covering the impeller 6 and the air guide 10; A soundproof cover 14 that covers the outer peripheral surface of the fan case 13 is provided, and a three-dimensional framework urethane material 15 a and a felt (sound absorbing material) 16 are laminated between the fan case 13 and the soundproof cover 14. .

  As shown in FIG. 4, the vacuum cleaner 17 includes a dust collection chamber 19 that communicates with the main body intake port 18, a vacuum cleaner main body 22 that has a blower chamber 21 that includes a main body exhaust port 20, and a main body in the dust collection chamber 19. A dust bag 23 that is airtightly attached to the intake port 18 and an electric blower 1 a installed in the blower chamber 21 are configured. Although not shown, a hose and an extension pipe are sequentially connected to the main body inlet 18, and a nozzle for sucking dust on the floor surface is attached to the tip of the extension pipe.

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

  First, as shown in FIGS. 1 and 4, when electric power is supplied to the electric blower 1 a, a magnetic field is generated in the stator 3 and the rotor 2, and the rotor 2 is rotated by electromagnetic force. The impeller 6 fixed to the rotating shaft 5 rotates at high speed. When the impeller 6 rotates at a high speed, the dust collection chamber 19 is in a negative pressure state, and an air flow including dust sucked from the floor nozzle passes through the connection pipe, the gripping portion, the hose, and the main body vent 18 and enters the dust collection chamber 19. It flows into the dust bag 23.

  As shown in FIG. 1, the clean airflow filtered and separated by the dust bag 23 flows into the impeller 6 from the air inlet 11 and passes through the ventilation path 8 formed by the stationary blades 7 of the air guide 10. A part of the airflow is discharged from the exhaust port 12 of the fan case 13. The remaining airflow flows into the electric motor 4 from the return passage 9, passes through the electric motor 4, and is then discharged to the outside of the cleaner body 22.

  Most of the noise generated when the electric blower 1a is driven is rotation noise having a protruding sound pressure level due to rotation of the impeller 6 and turbulence noise due to turbulence of the airflow flowing through the structure. A high sound pressure level noise is radiated from the exhaust port 12 provided on the outer periphery of the fan case 13. Therefore, in order to significantly reduce the noise of the electric blower 1a, it is very effective to improve the soundproofing effect on the outer periphery of the fan case 13.

  The urethane material 15a having a three-dimensional skeleton structure removes the foamed film by heat-treating the foamed urethane material, and forms a three-dimensional skeleton structure in which voids exist substantially uniformly. Therefore, the porosity is as large as 80% or more, and the air pressure loss is significantly smaller than that of the sound absorbing material having almost no air permeability. Further, the porosity of the skeleton structure can be adjusted by changing the gap when a foaming agent is injected into urethane.

  Since the airflow flowing out from the exhaust port 12 flows into the skeleton structure of the urethane material 15a, the rapid expansion of the airflow immediately after the exhaust port 12 is suppressed, so that the expansion loss generated at the exhaust port 12 is reduced. Moreover, since the skeleton structure of the urethane material 15a has a small airflow pressure loss, the blowing performance of the electric blower hardly decreases.

In addition, noise radiated from the exhaust port 12 of the fan case 13 interferes with each other inside the skeleton structure of the urethane material 15a, so that sounds whose phases are different in propagation distance and propagation speed cancel each other. Therefore, the urethane material 15a having a three-dimensional skeleton structure can have a silencing effect. Further, the noise transmitted through the urethane material 15 a having a three-dimensional skeleton structure is greatly silenced by the synergistic effect of the sound absorption effect of the felt 16 laminated on the outer periphery of the urethane material 15 a and the sound insulation effect by the soundproof cover 14.

  As described above, in the present embodiment, the blowing performance of the electric blower is substantially reduced by stacking the urethane material 15a having the three-dimensional skeleton structure and the felt 16 and providing the laminate between the fan case 13 and the soundproof cover 14. Without causing the noise, the noise radiated from the exhaust port 12 of the fan case 13 can be greatly silenced.

(Embodiment 2)
FIG. 5 is a perspective view in which a part of the electric blower according to the second embodiment of the present invention is broken, and the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 5, two urethane materials 15b and 15c having a three-dimensional skeleton structure with different porosity from which the foam film has been removed are laminated to cover the outer periphery of the fan case 13, and the urethane material having a low porosity. 15b is arranged on the fan case 13 side, and the void ratio of the urethane material is increased toward the outer peripheral side from the fan case 13 toward the felt 16. For example, the porosity of the urethane material 15b having a three-dimensional skeleton structure is approximately 80%, and the porosity of the urethane material 15c having a three-dimensional skeleton structure is approximately 90%.

  Then, since the airflow from the exhaust port 12 of the fan case 13 flows in the order of the urethane material 15b having a three-dimensional skeleton structure with a low porosity and the urethane material 15c having a three-dimensional skeleton structure with a high porosity, the airflow As the road becomes larger stepwise, the flow velocity becomes smaller, and the urethane materials 15b and 15c having a three-dimensional skeleton structure can serve as a diffuser for converting the dynamic pressure generated by the impeller into a static pressure. The performance can be improved. The urethane material having a three-dimensional skeleton structure is not limited to two, and a plurality of urethane materials may be installed in an allowable space.

(Embodiment 3)
FIG. 6 is a perspective view in which a part of the electric blower in the third embodiment of the present invention is broken, and the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  As shown in FIG. 6, the surface of the urethane sound-absorbing material 24 facing the fan case 13 is profile processed to provide irregularities, and a urethane material 15d having a three-dimensional skeleton structure is disposed so as to fill the irregularities. Thereby, it becomes possible to take a large sound absorption area compared with the case where the surface of the sound absorbing material is flat, and the sound absorbing effect of the sound absorbing material can be improved.

  The uneven shape is not limited to this, and is determined according to the material and processing method of the sound absorbing material and the allowable dimensions.

(Embodiment 4)
FIG. 7 is a perspective view in which a part of the electric blower in the fourth embodiment of the present invention is broken, and the same elements as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

As shown in FIG. 7, the electric blower 1 b covers the outer periphery with a urethane sound absorbing material 24, and further covers the outer periphery with a soundproof cover 14. The urethane sound-absorbing material 24 is formed by foaming, forms a corresponding flow path for each of the plurality of exhaust ports 12 on the outer periphery of the fan case 13, and has a three-dimensional skeleton structure urethane in each flow path. The material 15e is filled. The outer periphery of the urethane sound absorbing material 24 has a circular shape, and the cylindrical soundproof cover 14 is fixed so as to cover the urethane sound absorbing material 24.

  About the electric blower 1b comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. First, when electric power is supplied to the electric blower 1b and driven, the impeller 6 rotates at a high speed and airflow is generated. The airflow flowing out from the exhaust port 12 flows into the flow path formed by the urethane sound absorbing material 24. Since the flow path is filled with a urethane material having a three-dimensional skeleton structure, the flow of air immediately after the exhaust port 12 is suppressed from rapidly expanding, and the expansion loss generated at the exhaust port 12 is reduced.

  Moreover, since each flow path is formed of the urethane sound absorbing material 24, the sound absorbing area where noise enters can be increased, and the sound absorbing effect of the urethane sound absorbing material 24 can be enhanced. And since each flow path is provided corresponding to the exhaust port 12 of the fan case 13, the flow of the exhaust airflow from the exhaust port 12 is made smooth, flow path loss is reduced, and the ventilation performance of an electric blower is improved. can do.

  As described above, in the present embodiment, the urethane sound absorbing material 24 is foam-molded to form a corresponding flow path for each exhaust port 12 on the outer periphery of the fan case 13. The flow of the exhaust air from 12 can be made smooth, and the sound absorption area of the sound absorbing material can be expanded, so that the air blowing performance of the electric blower can be improved and the noise can be reduced.

  In addition, each embodiment described above is not limited to this, It can comprise suitably combining as needed.

  In addition to felt, in addition to felt, those using inorganic fibers such as glass wool and rock wool, porous type sound absorbing materials such as urethane foamed polyurethane, and thin film vibration type sound absorbing materials using thin plates and thin films In addition, there is a resonance type sound-absorbing material that utilizes a noise-reducing effect due to resonance, but a porous sound-absorbing material is very easy to handle because it is easy to process and can be obtained at low cost. In addition, products having various sound absorption characteristics according to the material and fiber diameter are handled on the market, making it easy to select a sound absorbing material corresponding to the frequency to be silenced and facilitating noise reduction design of the electric blower.

  Although sound waves are fluctuations in air pressure, the sound-absorbing material absorbs sound by generating viscous friction of air due to fibers, films, etc. when sound waves are going to propagate inside, and converting sound wave energy into heat energy. In general, many sound absorbing materials have little air permeability. However, depending on the material structure, the sound absorbing effect is exhibited by vibrating the fibers and the film itself.

  As described above, the electric blower according to the present invention can obtain a significant silencing effect without reducing the ventilation pressure loss and reducing the blowing performance of the electric blower. It can be applied to uses such as vacuum cleaners.

The fracture | rupture front view of the electric blower in the 1st Embodiment of this invention The perspective view which fractured a part of the electric blower The top view showing the structure of the impeller and air guide of the electric blower Sectional drawing showing the structure of the vacuum cleaner using the electric blower The perspective view which fractured | ruptured a part of electric blower in the 2nd Embodiment of this invention The perspective view which fractured | ruptured a part of electric blower in the 3rd Embodiment of this invention The perspective view which fractured | ruptured a part of electric blower in the 4th Embodiment of this invention Broken front view of a conventional electric blower

DESCRIPTION OF SYMBOLS 1a, 1b Electric blower 4 Electric motor 5 Rotating shaft 6 Impeller 8 Ventilation path 10 Air guide 12 Exhaust port 13 Fan case 14 Soundproof cover 15a Three-dimensional skeleton structure urethane material 16 Felt (sound absorbing material)
24 Urethane sound absorbing material

Claims (5)

An electric motor, an impeller fixed to the rotating shaft of the electric motor, an air guide that forms a ventilation path on the outer periphery of the impeller, a fan case that has an exhaust port on the outer periphery and covers the impeller and the air guide, An electric blower comprising a soundproof cover that covers an outer peripheral surface of the fan case, and a laminate of a urethane material and a sound absorbing material having a three-dimensional skeleton structure arranged between the fan case and the soundproof cover. The urethane material of the three-dimensional skeleton structure covers the outer periphery of the fan case, the sound absorbing material is configured to cover the outer periphery of the urethane material, and the void of the three-dimensional skeleton structure becomes larger toward the outer peripheral side of the urethane material. Item 4. The electric blower according to Item 1. The electric blower according to claim 1 or 2, wherein the sound absorbing material has an uneven shape on a surface facing the fan case. The electric blower according to claim 1 or 2, wherein the sound absorbing material forms a flow path corresponding to an exhaust port of the fan case. The vacuum cleaner using the electric blower of any one of Claims 1-4.

Images