JP2008180164A - Electric blower and electric vacuum cleaner using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor fan increased in air-flowing efficiency, and capable of preventing airtightness from being degraded by drop out of a fixing part even when large force is applied to a sealing part of a fan case spacer. <P>SOLUTION: This motor fan includes an impeller 5, a fan case 7 pressed in and fixed to a frame 6 of a motor 3 by covering the impeller 5, and the resin fan case spacer 9 arranged in an intake opening of the fan case 7 and having the sealing part 8 projecting in the impeller 5 direction. The fan case spacer 9 is provided, between the sealing part 8 and the fixing part 12 to the fan case 7, with a deformation part 13 allowing the sealing part 8 to be deformed toward an intake upstream side 7b of the fan case 7. Thereby, even when large force is applied to the sealing part 8 in arranging the fan case spacer 9, the deformation part 13 is deformed, large force is prevented from being acted on the fixing part 12 to prevent the fixing part 12 from coming off, vacuum pressure is increased, and air-blowing efficiency can be increased by securing airtightness. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric blower having high blowing efficiency and a vacuum cleaner using the electric blower.

  Conventionally, as this type of electric blower, various methods have been proposed to ensure the airtightness of the fan case and the fan case spacer in order to increase the blowing efficiency.

  That is, the resin fan case spacer is inserted into the sheet metal fan case from the upstream side of the intake air and fixed by welding, and the labyrinth gap between the fan case spacer sealing portion and the impeller suction port is When the case is press-fitted, the sealing portion is abutted against (or in contact with) the inlet of the impeller, and then the abutting sealing portion is cut by the rotation of the impeller (for example, see Patent Document 1) ), Which is fixed between the fan case and the fan case spacer via a highly airtight elastic body or fixed by integral molding (see, for example, Patent Document 2), a small protrusion on the outer periphery of the fan case spacer Installed toward the case side and fixed with improved airtightness with the fan case using the elasticity of the resin (for example, patent documents) 3 reference), and the like are known.

  FIG. 7 shows a configuration referred to Patent Document 1 among the conventional configurations.

  As shown in the figure, the electric blower includes an impeller 31 fixed to the rotating shaft 30 of the electric motor and rotating at a high speed, a sheet metal fan case 32 press-fitted and fixed to the frame of the electric motor so as to cover the impeller 31, and a fan case And a resin-made fan case spacer 34 having a substantially cylindrical sealing portion 33 that is provided in the air intake opening 32a at the center of the 32 and protrudes toward the suction port 36 of the impeller 31. By inserting a plurality of protruding protrusions 35, which are fixed portions 37, into the fan case 32 from the intake upstream side 32b to the intake opening 32a, and the fan case spacer 34 is welded to the central portion of the fan case 32 by heat welding or the like. It is fixed.

Further, the labyrinth gap A between the sealing portion 33 of the fan case spacer 34 and the suction port 36 of the impeller 31 causes the sealing portion 33 to fit into the suction port 36 of the impeller 31 when the fan case 32 is press-fitted into the frame of the motor. After the contact (or while contacting), the sealing portion 33 that is in contact is formed by rotating and cutting the impeller 31. In addition, the contact part to the sealing part 33 in the suction port 36 of the impeller 31 is made of metal.
Japanese Patent Laid-Open No. 5-76153 Japanese Patent Laid-Open No. 5-22697 JP 2000-64993 A

  However, in the conventional configuration with reference to Patent Document 1, when the fan case 32 is press-fitted into the frame of the electric motor, the sealing portion 33 and the suction port 36 of the impeller 31 are brought into contact with each other, and are also press-fitted at this location. A large force is applied to the sealing portion 33. This force is transmitted to the fan case spacer 34 formed integrally with the sealing portion 33 and the fixing portion 37. Therefore, as shown in FIG. 7B, the fixing portion 37 that welds and fixes the fan case spacer 34 is detached from the fan case 32 to create a gap E, and the airtightness between the fan case 32 and the fan case spacer 34 is reduced. The air leakage from the gap E to the outside of the fan case 32 has a problem that the blowing efficiency is lowered.

  Moreover, in the conventional configuration in Patent Documents 2 and 3, even if a highly airtight elastic body is used or a minute protrusion is provided on the outer periphery of the fan case spacer toward the fan case, the fan case spacer 34 is not Since the fan case spacer 34 is entirely lifted from the fan case 32 due to the substantially annular shape, the airtightness may not be sufficiently secured.

  The present invention solves the above-mentioned conventional problems, and the sealing part of the fan case spacer and the suction port of the impeller are pressed into contact with each other, and even if a large force is applied to the sealing part, the fixing part is detached and airtightness is achieved. An object of the present invention is to provide an electric blower with improved ventilation efficiency and a vacuum cleaner using the same without being damaged.

  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, and a fan case that is press-fitted and fixed to a frame of the electric motor so as to cover the impeller. And a fan case spacer made of resin having a cylindrical sealing portion that is provided in the air intake opening at the center of the fan case and protrudes toward the inlet of the impeller, and the fan case spacer is Between the sealing part and the fixing part to the fan case, there is provided a deforming part in which the sealing part can be deformed to the intake upstream side of the fan case when the fan case is press-fitted and fixed to the frame. .

  As a result, the sealing part and the suction port of the impeller are brought into contact and press-fitted, and even if a large force is applied to the sealing part, the deforming part is deformed so that a large force is not applied to the fixing part, so the fixing part does not come off. The vacuum pressure is increased, airtightness can be secured, and the blowing efficiency can be increased.

  The vacuum cleaner using the electric blower of the present invention can realize a vacuum cleaner with high suction performance and reduced energy consumption.

  The electric blower of the present invention and the electric vacuum cleaner using the electric blower can be improved in air blowing efficiency and high suction performance without impairing airtightness.

  The first invention includes an electric motor, an impeller fixed to the rotating shaft of the electric motor, a fan case that is press-fitted and fixed to a frame of the electric motor so as to cover the impeller, and an intake opening at a central portion of the fan case And a resin-made fan case spacer having a cylindrical sealing portion protruding toward the inlet of the impeller, the fan case spacer being between the sealing portion and the fixing portion to the fan case. In addition, when the fan case is press-fitted and fixed to the frame, the electric blower is provided with a deformable portion that can deform the sealing portion toward the intake upstream side of the fan case. As a result, the sealing part and the suction port of the impeller are brought into contact and press-fitted, and even if a large force is applied to the sealing part, the deforming part is deformed so that a large force is not applied to the fixing part, so the fixing part does not come off. The vacuum pressure is increased, airtightness can be ensured, and the air blowing efficiency can be increased.

  According to a second aspect of the present invention, in particular, in the first aspect, the deformation portion is an elastically deformable portion that can be elastically deformed, so that the sealing portion and the impeller suction port are always in pressure contact with the impeller suction port. The labyrinth gap can be reduced, and unlike plastic deformation, the labyrinth gap can be prevented from gradually expanding after assembly and during operation. In particular, when the suction pressure increases during operation, the impeller moves to the intake upstream side, i.e., the sealing portion side, and when the suction pressure decreases, it repeatedly returns to the motor side. The labyrinth gap is automatically minimized, and airtightness can be secured with a simple configuration.

  In the third aspect of the invention, in particular, in the first or second aspect of the invention, the deformable portion can be easily configured by providing an annular slit portion on the impeller side. Moreover, a slit part can also be given by additional cutting etc. after shape | molding the resin fan case spacer, and a deformation | transformation part can also be added easily. And since the slit part was provided in the impeller side, high ventilation efficiency can be maintained, without generating the disorder in the air flow path containing an intake upstream.

  In the fourth aspect of the invention, in particular, in the first or second aspect of the invention, the deformable portion can be easily configured by providing an annular slit portion on the intake upstream portion side. Moreover, a slit part can also be given by additional cutting etc. after shaping | molding resin-made fan cases, and a deformation | transformation part can also be added easily. In particular, after fixing the fan case spacer to the fan case, the slit portion can be easily provided from the outside. And, since the slit portion was provided on the intake upstream side, that is, the side opposite to the impeller, an increase in disk rotation friction loss due to an increase in surface area on the impeller side and an increase in loss due to peeling due to an increase in unevenness were prevented, High ventilation efficiency can be maintained.

  In the fifth aspect of the invention, in particular, in the first or second aspect of the invention, the deformed portion is provided with an annular thin portion, so that damage due to stress concentration can be prevented when the deformed portion is deformed. . It can also be configured with high elasticity.

  In the sixth aspect of the invention, in particular, in the first or second aspect of the invention, the deformed portion is provided with a bent portion so that the actual length from the sealing portion to the fixed portion can be secured long. The force applied to the part can be further attenuated. In addition, it is easy to increase the size of the bent portion as compared with the case where the sealing portion and the fixed portion are formed in close proximity to each other, and high elasticity performance can be configured.

  The seventh aspect of the invention can realize a vacuum cleaner with high suction performance and reduced energy consumption, particularly by using the electric vacuum cleaner having the electric blower of any one of the first to sixth aspects of the invention. it can.

  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 and 2 show an electric blower according to Embodiment 1 of the present invention.

  As shown in the figure, the electric blower 1 according to the present embodiment covers an electric motor 3 having a rotor 2 that rotates at high speed, an impeller 5 that rotates while being fixed to a rotating shaft 4 of the rotor 2, and the impeller 5. A sheet metal fan case 7 that is press-fitted and fixed to the frame 6 of the electric motor 3, and a cylindrical shape that is installed in the air intake opening 7 a at the center of the fan case 7 and protrudes toward the air inlet 5 a of the impeller 5. A resin fan case spacer 9 having a sealing portion 8 is provided.

  When the fan case 7 is press-fitted and fixed to the frame 6 between the sealing part 8 and the fixing part 12 to the fan case 7, the fan case spacer 9 is inserted into the fan case 7. A deformable portion 13 that can be deformed to the upstream side 7b is provided. The fixing part 12 of the fan case spacer 9 has a plurality of protruding protrusions 10 and is fixed by being inserted into the fan case 7 from the intake upstream side 7b into the intake opening 7a and then welded by thermal welding or the like. ing.

  Further, the labyrinth gap A between the sealing portion 8 of the fan case spacer 9 and the suction port 5a of the impeller 5 allows the sealing portion 8 to be inserted into the suction port of the impeller 5 when the fan case 7 is press-fitted into the frame 6 of the electric motor 3. After contacting (or contacting) 5a, the contacting sealing portion 8 is formed by rotating the impeller 5 and cutting. In addition, the contact part to the sealing part 8 in the inlet 5a of the impeller 5 is made of metal.

  The deformable deformable portion 13 is an elastically deformable elastic deformable portion. Thereby, the sealing part 8 always press-contacts with the suction inlet 5a of the impeller 5, the adhesiveness of the sealing part 8 and the suction inlet 5a of the impeller 5 is increased, and the labyrinth gap A is made small. Further, unlike plastic deformation, the labyrinth gap A is prevented from gradually expanding after assembly and during operation. In particular, during operation, when the suction pressure increases, the impeller 5 moves to the intake upstream side 7b, that is, the sealing portion 8 side, and when the suction pressure decreases, the impeller 5 returns to the electric motor 3 side repeatedly. The labyrinth gap A is automatically minimized in the operating state, and airtightness is secured with a simple configuration.

  In the present embodiment, the deformable portion 13 is configured by providing an annular slit portion 14 on the impeller 5 side of the fan case spacer 9. Thereby, the deformation | transformation part 13 can be comprised easily. Moreover, the slit part 14 can also be given by additional cutting etc. after shape | molding the resin-made fan case spacer 9, and the deformation | transformation part 13 can also be added easily. And since the slit part 14 was provided in the impeller 5 side, high ventilation efficiency can be maintained, without generating the disorder in the air flow path containing the intake upstream 7b. Since the fan case spacer 9 including the slit portion 14 is made of resin, the fan case spacer 9 has high elasticity before and after the slit portion 14.

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

  When the fan case 7 is pressed into the frame 6 of the electric motor 3, the sealing portion 8 is brought into contact with the suction port 5 a of the impeller 5. At this time, the sealing portion 8 is also pressed into the suction port 5 a of the impeller 5. It becomes a state. When a force is applied to the sealing portion 8, a force is applied to the entire fan case spacer 9, and a large force tends to be exerted on the fixing portion 12, but the deformation portion 13 is provided between the sealing portion 8 and the fixing portion 12. Since the stress concentrates on the slit portion 14 of the deformable portion 13 and deforms, the force acting on the fixed portion 12 can be relaxed, and as a result, the force applied to the fixed portion 12 can be suppressed.

  After the fan case 7 is attached, the rotor 2 rotates at a high speed when power is applied to the motor 3. Next, when the rotor 2 rotates, the impeller 5 fixed to the rotating shaft 4 rotates. Therefore, when the impeller 5 rotates at high speed, air is sucked from the fan case spacer 9 (arrow B), and is guided to the inside of the electric motor 3 through the inside of the impeller 5 (arrow C). Thereafter, the air guided to the inside of the electric motor 3 is discharged to the outside while cooling the electric motor 3 (arrow D).

  At this time, since the sealing portion 8 is brought into contact with the suction port 5a of the impeller 5, the labyrinth gap A is formed by rotating the impeller 5 and cutting the sealing portion 8 in contact.

  As described above, in the present embodiment, the fan case spacer 9 is press-fitted into the frame 6 of the electric motor 3 between the sealing portion 8 and the fixing portion 12 of the fan case spacer 9 to the fan case 7. When the sealing portion 8 is provided with the deformable portion 13 which can be deformed to the intake upstream side 7b, the sealing portion 8 and the suction port 5a of the impeller 5 are brought into contact with each other and pressed, and a large force is applied to the sealing portion 8. However, since the deformation | transformation part 13 deform | transforms and a big force is not applied to the fixing | fixed part 12, airtightness can be ensured, without the fixing | fixed part 12 removing.

  As a result, the labyrinth gap A between the sealing portion 8 and the inlet 5a of the impeller 5 can be minimized, and at the same time, the airtightness of the fan case 7 and the fan case spacer 9 can be sufficiently secured. The air blowing efficiency can be increased.

  In the present embodiment, the deformable portion 13 is an elastically deformable portion that can be elastically deformed, so that the sealing portion 8 is always in pressure contact with the suction port 5a of the impeller 5 so that the sealing portion 8 and the impeller 5 are sucked. The adhesion to the mouth 5a can be increased, the labyrinth gap A can be reduced, and unlike the plastic deformation, the labyrinth gap A can be prevented from gradually expanding after assembly and during operation. In particular, during operation, the impeller 5 moves to the intake upstream side 7b, that is, the sealing portion 8 side when the suction pressure increases, and repeatedly returns to the motor 3 side when the suction pressure decreases. The labyrinth gap A is automatically minimized in the above operating state, and airtightness can be secured with a simple configuration without requiring an elastic member such as PTFE.

  Moreover, in this Embodiment, the deformation | transformation part 13 can be simply comprised by having set the deformation | transformation part 13 as the structure which provided the cyclic | annular slit part 14 at the impeller 5 side. Moreover, a slit part can also be given by additional cutting etc. after shape | molding the resin-made fan case spacer 9, and the deformation | transformation part 13 can also be added easily. And since the slit part 14 was provided in the impeller 5 side, high ventilation efficiency can be maintained, without generating the disorder in the air flow path containing the intake upstream 7b.

(Embodiment 2)
FIG. 3 shows a main part of the electric blower according to Embodiment 2 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in the figure, in the present embodiment, the deformable portion 13 is configured by providing an annular slit portion 15 on the intake upstream side 7 b of the fan case spacer 9.

  Thereby, the deformation | transformation part 13 can be comprised easily. In addition, after forming the resin fan case spacer 9, slits can be formed by additional cutting or the like, and the deformed portion 13 can be easily added. In particular, after fixing the fan case spacer 9 to the fan case 7, the slit portion 15 can be easily provided from the outside. Since the slit portion 15 is provided on the intake upstream side 7b, that is, on the side opposite to the impeller 5, there is an increase in disk rotational friction loss due to an increase in surface area on the impeller 5 side and loss due to peeling due to an increase in unevenness. Increase can be prevented and high air blowing efficiency can be maintained.

(Embodiment 3)
FIG. 4 shows a main part of the electric blower according to Embodiment 3 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in the figure, in the present embodiment, the deformable portion 13 is configured by providing an annular thin portion 16. The thin portion 16 is configured by scraping the impeller 5 side and / or the intake upstream side 7b of the fan case spacer 9 or one of them.

  Thereby, when the deformation | transformation part 13 deform | transforms, the damage by stress concentration can be prevented. It can also be configured with high elasticity.

  It is possible to prevent breakage due to stress concentration when the deformed portion is deformed. It can also be configured with high elasticity.

  Further, since the gap between the fan case 7 and the fan case spacer 9 is eliminated, it is possible to eliminate the sound of airflow flowing through the gap.

(Embodiment 4)
FIG. 5 shows a main part of the electric blower according to Embodiment 4 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in the figure, in the present embodiment, the deformable portion 13 is constituted by a bent portion 18 that is bent. The bent portion 18 extends between the sealing portion 8 and the fixed portion 12 of the fan case spacer 9 and is bent largely in the vicinity of the outer peripheral end on the fixed portion 12 side.

  Thus, since the deformation | transformation part 13 was comprised by the bent part 18 bent, since the actual length from the sealing part 8 to the fixing | fixed part 12 can be ensured long, the force concerning the fixing | fixed part 12 can be attenuate | damped more. . Further, it is easy to enlarge the bent portion 18 as compared with the case where the sealing portion 8 and the fixing portion 12 are formed substantially close to each other, and high elasticity performance can be configured.

  Further, the bent portion 18 may be provided not in the outer peripheral end of the fan case spacer 9 but in the middle portion in order to reduce the size. Further, by providing a wave-shaped elastically deformable portion between the sealing portion 8 and the bent portion 18, the elasticity performance can be further enhanced.

(Embodiment 5)
FIG. 6 shows a vacuum cleaner according to Embodiment 5 of the present invention.

  As shown in the figure, the vacuum cleaner main body 19 has the electric blower 1 of any one of the first to fourth embodiments, and sucks dust together with the air flow from the suction nozzle 20 through the extension pipe 22 and the hose 23. In addition, dust is stored in the dust collection chamber 21.

  Here, since the electric blower 1 does not impair the airtightness, increases the blowing efficiency, and has a high suction performance, it is possible to realize a vacuum cleaner that has excellent energy consumption.

  As described above, the electric blower according to the present invention and the electric vacuum cleaner using the electric blower do not impair airtightness, increase the air blowing efficiency, and have high suction performance. It can be applied not only to household electrical appliances such as compressors, but also to industrial equipment such as compressors, turbines, and liquid pumps. Moreover, if it is a vacuum cleaner, the practical thing which restrained energy consumption can be provided regardless of household use and business use.

The front view which showed the electric blower in Embodiment 1 of this invention in the half cross section (A) Partial sectional view of the fan case spacer portion of the electric blower (b) Half sectional view showing the relationship between the fan case spacer, the impeller and the fan case (A) Partial sectional view of the fan case spacer portion of the electric blower in Embodiment 2 of the present invention (b) Half sectional view showing the relationship among the fan case spacer, the impeller, and the fan case (A) Partial sectional view of the fan case spacer portion of the electric blower in Embodiment 3 of the present invention (b) Half sectional view showing the relationship among the fan case spacer, the impeller, and the fan case (A) Partial sectional view of the fan case spacer portion of the electric blower in Embodiment 4 of the present invention (b) Half sectional view showing the relationship among the fan case spacer, the impeller and the fan case Sectional drawing of the vacuum cleaner in Embodiment 5 of this invention (A) Partial sectional view of a fan case spacer portion of a conventional electric blower (b) Half sectional view showing the relationship among the fan case spacer, impeller and fan case

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric blower 3 Electric motor 4 Rotating shaft 5 Impeller 6 Frame 7 Fan case 7a Intake opening 7b Intake upstream 8 Sealing part 9 Fan case spacer 12 Fixing part 13 Deformation part 14, 15 Slit part 16 Thin part 18 Bending part

Claims (7)

An electric motor, an impeller fixed to the rotating shaft of the electric motor, a fan case that covers the impeller and is press-fitted and fixed to a frame of the electric motor, and an air intake opening at a central portion of the fan case and the impeller A resin-made fan case spacer having a cylindrical sealing portion projecting toward the suction port, and the fan case spacer includes the fan case between the sealing portion and the fixing portion to the fan case. An electric blower provided with a deformable portion capable of deforming the sealing portion toward the intake upstream side of the fan case when press-fitted and fixed to the frame. The electric blower according to claim 1, wherein the deformable portion is an elastically deformable elastic deformable portion. The electric blower according to claim 1 or 2, wherein the deforming portion has a configuration in which an annular slit portion is provided on the impeller side. The electric blower according to claim 1 or 2, wherein the deforming portion has a configuration in which an annular slit portion is provided on the intake upstream side. The electric blower according to claim 1 or 2, wherein the deforming portion has a configuration in which an annular thin portion is provided. The electric blower according to claim 1, wherein the deformable portion is configured to have a bent portion that is bent. The vacuum cleaner which has an electric blower of any one of Claims 1-6.