JP4867677B2 - Electric blower and electric vacuum cleaner using it - Google Patents

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

  As shown in the figure, the electric blower includes an impeller 21 that is fixed to the rotating shaft 20 of the electric motor and rotates at a high speed, a sheet metal fan case 22 that is press-fitted and fixed to the frame of the electric motor so as to cover the impeller 21, and a fan case And a resin-made fan case spacer 24 having a substantially cylindrical sealing portion 23 that is installed in the air intake opening 22a at the center of the blade 22 and protrudes in the direction of the suction port 26 of the impeller 21. By inserting a plurality of protruding protrusions 25, which are fixed parts 27, into the fan case 22 from the intake upstream side 22b to the intake opening 22a and welding the fan case spacer 24 to the center of the fan case 22 by heat welding or the like. It is fixed.

Further, the labyrinth gap A between the sealing portion 23 of the fan case spacer 24 and the suction port 26 of the impeller 21 causes the sealing portion 23 to enter the suction port 26 of the impeller 21 when the fan case 22 is press-fitted into the frame of the motor. After the contact (or while contacting), the sealing portion 23 that is in contact is formed by rotating and cutting the impeller 21. In addition, the contact part to the sealing part 23 in the suction inlet 26 of the impeller 21 is made of metal.
JP-A-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 22 is press-fitted into the frame of the electric motor, the sealing portion 23 and the suction port 26 of the impeller 21 are brought into contact with each other, and are also press-fitted at this point. A large force is applied to the sealing portion 23. This force is transmitted to the fan case spacer 24 formed integrally with the sealing portion 23 and to the fixing portion 27. Therefore, as shown in FIG. 6B, the fixing portion 27 for welding and fixing the fan case spacer 24 is detached from the fan case 22 to form a gap E, and the airtightness between the fan case 22 and the fan case spacer 24 is lowered. The air leakage from the gap E to the outside of the fan case 22 has a problem that the blowing efficiency is lowered.

  Further, in the conventional configuration in Patent Documents 2 and 3, even if a highly airtight elastic body is used, or even if a minute protrusion is provided on the outer periphery of the fan case spacer toward the fan case side, the fan case spacer 24 is not Since the fan case spacer 24 is entirely lifted from the fan case 22 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, the electric blower according to the present invention has a fan case in which a plurality of small protrusions are provided at a position in contact with the fan case spacer in the intake opening of the fan case, and the fan is in contact with the inlet of the impeller. The small protrusion is press-fitted into the fan case spacer when the sealing portion of the case spacer rotates slightly.

  As a result, even if the sealing part of the fan case spacer and the suction port of the impeller are pressed into contact with each other and a large force is applied to the sealing part, the small protrusions of the fan case are press-fitted into the fan case spacer and fixed. By increasing the force, a large force is not applied to the fixing portion of the fan case spacer, so that the fixing portion does not come off, and airtightness can be ensured, air blowing efficiency can be improved, and suction performance can be improved. In addition, even if there is a gap when the fan case spacer is welded and fixed to the fan case, the gap between the fan case and the fan case spacer can be minimized in the vicinity of the small protrusion. Can be secured.

  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 vacuum cleaner using the electric blower can ensure airtightness, increase the blowing efficiency, and have high suction performance.

  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 fan case spacer having a cylindrical sealing portion projecting toward the inlet of the impeller, and a plurality of air intake openings of the fan case at a position where the fan case spacer comes into contact. The electric blower is configured such that a small protrusion is provided and the sealing portion that is in contact with the inlet of the impeller rotates slightly so that the small protrusion is press-fitted into the fan case spacer. As a result, even if the sealing part of the fan case spacer and the suction port of the impeller are pressed into contact with each other and a large force is applied to the sealing part, the small protrusions of the fan case are press-fitted into the fan case spacer and fixed. By increasing the force, a large force is not applied to the fixing portion of the fan case spacer, so that the fixing portion does not come off, and airtightness can be ensured, air blowing efficiency can be improved, and suction performance can be improved. In addition, even if there is a gap when the fan case spacer is welded and fixed to the fan case, the gap between the fan case and the fan case spacer can be minimized in the vicinity of the small protrusion. Can be secured.

  As a result, the labyrinth gap between the sealing part and the inlet of the impeller can be minimized, and at the same time, the airtightness of the fan case and the fan case spacer can be sufficiently secured, so that the vacuum pressure increases and the blowing efficiency of the electric blower can be improved. It can be done.

  According to a second aspect of the invention, in particular, in the first aspect of the invention, the fan case spacer has a press-fit engagement portion for press-fitting engagement of the small protrusion. The fan case spacer can be press-fitted and engaged, and deformation and cracking of the fan case spacer can be prevented.

  According to a third aspect of the invention, in particular, in the first or second aspect of the invention, the small protrusion is formed in a saw shape, so that it can be securely press-fitted even when the sealing portion has a small rotational force, and smoothly. Since the small protrusions are press-fitted and engaged while tearing the fan case spacer, deformation and cracking of the fan case spacer can also be prevented.

  In a fourth aspect of the invention, in particular, in any one of the first to third aspects of the invention, when the small protrusion is directed to the substantially inner peripheral side of the inlet of the impeller and the fan case spacer rotates slightly. Due to the guide shape twisted in the direction of movement to the impeller side, the fan case spacer integrated with the sealing part also rotates slightly at the same time due to the minute rotation of the sealing part, and the small protrusion is pressed into the fan case spacer. When being combined, the fan case spacer is press-fitted and engaged while moving in the direction in which the small protrusion is twisted, that is, on the impeller side, with the small protrusion serving as a guide. As a result, the close contact between the fan case and the fan case spacer can be increased simultaneously with the press-fitting engagement, and the airtightness can be further improved.

  The fifth aspect of the invention can realize a vacuum cleaner with high suction performance and reduced energy consumption, particularly by using the electric blower having the electric blower of any one of the first to fourth 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 to 3 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 provided in the suction opening 7 a at the center of the fan case 7 and that protrudes toward the suction port 11 of the impeller 5. A resin fan case spacer 9 having a sealing portion 8 is provided.

  The labyrinth gap A between the sealing portion 8 of the fan case spacer 9 and the suction port 11 of the impeller 5 is used when the fan case 7 is press-fitted into the frame 6 of the motor 3. After contacting (or contacting) 11, 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 11 of the impeller 5 is made of metal.

  Further, the fan case spacer 9 has a fixing portion 12 to the fan case 7 on the side opposite to the sealing portion 8, and has a plurality of protruding portions 10, and the fan case 7 has an intake upstream side. It is fixed by being inserted into the intake opening 7a from 7b and then welded by heat welding or the like.

  The intake opening 7 a of the fan case 7 is provided with a plurality of small protrusions 13 at the position (periphery) that contacts the fan case spacer 9, and the sealing portion 8 that contacts the suction port 11 of the impeller 5 rotates slightly. Thus, the small protrusion 13 is press-fitted into the fan case spacer 9.

  Further, in the present embodiment, the small protrusion 13 has a saw-like shape with a sharp tip protruding in the direction opposite to the rotation direction of the impeller 5.

  Further, the fan case spacer 9 is provided with a thick press-fitting engagement portion 14 for press-fitting engagement of the small protrusion 13. In addition, a saw-shaped portion 15 that engages (fits) the small protrusion 13 is provided at a position where the small protrusion 13 of the press-fitting engagement portion 14 is engaged.

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

  When the fan case 7 is attached and pressed into the frame 6 of the electric motor 3, the sealing portion 8 is brought into contact with the suction port 11 of the impeller 5. At this time, the sealing portion 8 is also pressed into the suction port 11 of the impeller 5. It becomes a state.

  After the fan case 7 is attached, when power is applied to the electric motor 3, the rotor 2 rotates at a high speed. Next, as 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 in FIG. 1), 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 in contact with the suction port 11 of the impeller 5, the labyrinth gap A is formed by rotating the impeller 5 and cutting the contacted sealing portion 8.

  Here, when the impeller 5 rotates and begins to cut the sealing portion 8, since the two are initially in pressure contact, the rotational force of the impeller 5 is transmitted to the sealing portion 8, and the sealing portion 8 and the fan integrated therewith The case spacer 9 also receives a rotational force (arrow F in FIG. 2B).

  Although the fan case spacer 9 is fixed to the fan case 7, it can be rotated slightly in the rotation direction when receiving a strong force for fixing by the welding method. The fan case spacer 9 receiving the rotational force of the impeller 5 rotates slightly in the same direction as the impeller 5. At this time, the plurality of small protrusions 13 provided at the contact point of the fan case 7 with the fan case spacer 9 are press-fitted into the press-fit engagement portion 14 of the fan case spacer 9 (saw-shaped portion). 15). Further, the small protrusion 13 has an acute tip projecting in the direction opposite to the impeller 5, and the smaller the protrusion 13 moves to the press-fit engagement portion 14 of the fan case spacer 9 as the fan case spacer 9 rotates. The press-fitting engagement is performed.

  Here, since the rotation direction of the impeller 5 is always constant, if the small protrusion 13 of the fan case 7 and the fan case spacer 9 are first press-fitted and engaged, this press-fitted and engaged force will not be weakened. .

  As described above, in the present embodiment, the plurality of small protrusions 13 are provided at the contact points of the fan case 7 with the fan case spacer 9, and the seal part 8 that is in contact with the suction port 11 of the impeller 5 is minute. Since the small protrusion 13 is press-fitted into the fan case spacer 9 by rotating, the sealing portion 8 and the suction port 11 of the impeller 5 are brought into contact and press-fitted, and a large force is applied to the sealing portion 8. However, since the small protrusion 13 is press-fitted and engaged with the fan case spacer 9 to increase the fixing force, a large force is not applied to the fixing portion 12, and thus the airtightness can be ensured without the fixing portion 12 coming off. Is.

  Further, even if there is a gap when the fan case spacer 9 is welded and fixed to the fan case 7, the gap between the fan case 7 and the fan case spacer 9 can be minimized in the vicinity of the small protrusion 13. Further, airtightness can be secured.

  As a result, the labyrinth gap A between the sealing portion 8 and the inlet 11 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.

  Further, since the fan case spacer 9 is provided with the press-fit engagement portion 14 for the press-fitting engagement of the small protrusion 13, the small protrusion 13 is press-fitted into the fan case spacer 9 sufficiently and reliably. The fan case spacer 9 can be prevented from being deformed or cracked.

  In addition, since the small protrusion 13 has a saw-like shape over the entire circumference, it can be securely press-fitted and engaged even when the sealing portion 8 has a small rotational force, and the small protrusion 13 can smoothly connect the fan case spacer 9. Since the press-fitting engagement is performed while tearing, deformation and cracking of the fan case spacer 9 can be prevented.

  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 2)
FIG. 4 shows a main part of the electric blower according to the second embodiment 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 drawing, in the present embodiment, the small protrusion 13 is directed to the impeller 5 side when the tip is directed to the substantially inner peripheral side of the suction port 11 and the fan case spacer 9 is slightly rotated. The guide shape was twisted.

  As a result, the fan case spacer 9 integrated with the sealing portion 8 is also rotated slightly by the slight rotation of the sealing portion 8 (arrow H in FIG. 4B), and the small protrusion 13 is press-fitted into the fan case spacer 9. At the time of joining, the fan case spacer 9 is press-fitted and engaged as the screw turns while the small protrusion 13 serves as a guide and moves toward the impeller 5 in the direction in which the small protrusion 13 is twisted.

  As a result, the close contact between the fan case 7 and the fan case spacer 9 can be increased simultaneously with the press-fitting engagement, and the airtightness can be further improved.

(Embodiment 3)
FIG. 5 shows a vacuum cleaner according to Embodiment 3 of the present invention.

  As shown in the figure, the vacuum cleaner main body 16 has the electric blower 1 according to any one of the first and second embodiments, and sucks dust together with the air flow from the suction nozzle 17 through the extension pipe and the hose 19, Dust is stored in the dust collection chamber 18.

  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) Half sectional view showing the related configuration of the fan case spacer, impeller and fan case of the electric blower (b) Plan view seen from the motor side showing the mounting state of the fan case spacer (A) The top view seen from the motor side which shows the fan case of the same electric blower (b) The top view seen from the motor side which shows the state before attachment of the same fan case spacer (A) Half sectional view showing the related configuration of the fan case spacer, impeller and fan case of the electric blower in Embodiment 2 of the present invention (b) The configuration of the small protrusion seen from the GG direction of (a) Side view Sectional drawing of the vacuum cleaner in Embodiment 3 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 part 7b Intake upstream side 8 Sealing part 9 Fan case spacer 11 Suction inlet 13 Small protrusion 14 Press-fit engagement part

Claims (5)

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 protruding in the direction of the suction port, and a plurality of small protrusions are provided at locations where the fan case spacer contacts the fan case spacer, The electric blower configured to press-engage the small protrusion into the fan case spacer when the sealing portion in contact with the suction port of the impeller rotates slightly. The electric blower according to claim 1, wherein the fan case spacer has a press-fit engagement portion for press-fitting engagement of the small protrusion. The electric blower according to claim 1 or 2, wherein the small protrusion has a saw shape. The small protrusion has a guide shape in which a tip is directed to a substantially inner peripheral side of the inlet of the impeller and twisted in a direction to move toward the impeller when the fan case spacer rotates slightly. The electric blower of any one of Claims. The vacuum cleaner which has an electric blower of any one of Claims 1-4.