JP2005137064A - Motor driven blower and vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor driven blower in which a motor efficiency can be improved while suppressing effectively the temperature rise of a stator in a frame. <P>SOLUTION: The motor driven blower 3, in which a wind discharging part 34 is provided at the fan cover mounting part 22b bulged from the metal tubular part 22a of the frame 22 of a motor section 3a, the part of the wind discharged from the fan of the blower section 3b is circulated through a wind discharging part 34 and discharged to the outside of the metal tubular part 22a, and the residual wind is circulated to the inside of the frame 22, is premised. A heat sink fin 35, to which the heat of the stator is transferred, is louvered to the tubular part 22a of the frame 22 in which the stator and the rotor are disposed in the interior, and this heat sink fin 35 is exposed with the wind discharged from the wind discharging part 34. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric blower that performs a blowing action by rotating a fan by a rotational force obtained by an electric motor unit, and a vacuum cleaner that is operated by mounting the electric blower.

  Conventionally, a general electric blower includes an electric motor part having a frame having a cylindrical part and a fan part having a fan that is rotated by the electric motor part. To be distributed.

In this type of electric blower, a plurality of exhaust holes are provided in the fan mounting part that integrally projects outward from the cylindrical part, so that the air discharged from the fan does not pass through the cylindrical part and passes through the exhaust hole. What exhausts outside the part is known (see Patent Document 1).
Japanese Patent Laid-Open No. 6-108995 (paragraphs 0008-0009, FIGS. 1 to 5)

  Incidentally, in the electric blower described in Patent Document 1, the entire amount of wind discharged from the fan is discharged to the outside of the frame, but instead of this configuration, a part of the wind discharged from the fan is outside the frame. When exhausting and circulating the remaining wind inside the frame, it is possible to reduce the windage loss around the outer periphery of the fan, and it is arranged in this frame by the wind circulating inside the frame. The stator and rotor etc. which are present can be cooled and the temperature rise thereof can be suppressed.

  However, in this configuration, since the amount of air flowing through the frame is reduced by the amount of air discharged from the fan to the outside of the frame, the cooling performance of the stator that generates heat is not good. Under these circumstances, in order to secure a larger amount of air flowing through the frame, it is necessary to reduce the diameter of the exhaust hole of the fan mounting part and reduce the amount of wind outflow from there. There is no actual situation. Therefore, the windage loss around the outer periphery of the fan becomes large and it is difficult to improve the motor efficiency.

  Problem to be solved by the invention is providing the electric blower which can improve motor efficiency, and a vacuum cleaner provided with the same, suppressing the temperature rise of the stator in a flame | frame effectively.

  A wind discharge part is provided in the fan cover mounting part that protrudes from the metal cylindrical part of the frame of the motor part, and a part of the wind discharged from the fan of the blower part is passed through the wind discharge part to the outside of the cylindrical part. The air blower distributes the remaining wind to the inside of the frame, and the wind is discharged from the wind discharge portion to the cylindrical portion of the frame in which the stator and the rotor are disposed. It is characterized by cutting the exposed heat-dissipating fins outward.

  ADVANTAGE OF THE INVENTION According to this invention, the electric blower which can improve motor efficiency can be provided, suppressing the temperature rise of the stator in a flame | frame effectively.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  A canister type vacuum cleaner 1 illustrated in FIG. 1 includes a vacuum cleaner body 2, an electric blower 3 built in the vacuum cleaner body 2, and dust-containing air sucked from a surface to be cleaned such as a floor surface in the vacuum cleaner body 2. And airflow guide means 4 for guiding the airflow.

  The cleaner body 2 to which the moving wheels are attached has, for example, a dust collecting part 5 composed of a dust collecting chamber and a suction port 6 located on the suction upstream side of the dust collecting part 5. In the cleaner main body 2, an electric blower 3 is arranged on the downstream side of the suction of the dust collecting unit 5, for example, at the rear of the cleaner main body 2.

  The airflow guide means 4 includes, for example, a flexible dust suction hose 7, an extension pipe 8 that is a combination of a plurality of hard pipes that can be expanded and contracted, and a suction port body 9. One end 7 a of the dust suction hose 7 is detachably connected to the suction port 6. The other end of the dust suction hose 7 is formed by a hand operating portion 7b. Various operation switches 10 are attached to the handle 7c of the hand operation unit 7b. One end of the extension tube 8 is detachably connected to the hand operating portion 7b, and the suction port body 9 is detachably connected to the other end of the extension tube 8. The suction port body 9 forming the tip of the airflow guide means 4 has a dust suction port 9a on its lower surface. The suction port body 9 incorporates a rotary cleaning body disposed facing the dust suction port 9a and a cleaning body motor (both not shown) for rotationally driving the cleaning body, but these may be omitted. .

  The electric vacuum cleaner 1 drives the electric blower 3 to form an air flow sucked into the electric blower 3, thereby sucking dust on the surface to be cleaned together with air from the dust suction port 9a and extending it. The dust can be captured by the dust collecting filter 5a formed by a dust collecting bag or the like in the dust collecting portion 5 after being guided to the dust collecting portion 5 of the cleaner body 2 by the pipe 8 and the dust suction hose 7. The dust collection part 5 can also be formed with the dust collection cup which can be attached or detached to the vacuum cleaner main body 2, and can perform cyclone type dust collection in the attachment state. The air that has passed through the dust collecting unit 5 is sucked into the electric blower 3 and discharged from the blower 3, and then discharged to the outside of the cleaner body 2 through an exhaust port (not shown) provided in the cleaner body 2. . Thus, the surface to be cleaned can be cleaned.

  Next, the electric blower 3 will be described with reference to FIGS. The electric blower 3 includes an electric motor part 3a, a blower part 3b, and a blower rectifier 3c.

  The electric motor unit 3a includes, for example, a stator 21, a pair of frames 22, 23, a rotor 24, and a pair of brush devices 28.

  Metal frames 22 and 23 made of, for example, iron form a motor frame MF. The frame 22 includes a cylindrical portion 22a having a cylindrical shape, for example, a bottomed cylindrical shape, and a fan cover mounting portion 22b projecting integrally by forming an annular flange shape radially outward from one end opening edge of the cylindrical portion 22a. have. A plurality of exhaust holes 22c (only one is shown in FIG. 2) are opened in the cylindrical portion 22a toward the closed wall at the other end. As shown in FIG. 3, the other frame 23 traverses one end opening of the frame 22 in the radial direction, and both ends thereof are screwed to the fan cover mounting portion 22b. In addition, the code | symbol 23a in FIG. 3 has shown the circular ventilation hole. As shown in FIG. 2, bearing housing portions 22d and 23d are provided corresponding to the frames 22 and 23, respectively.

  As shown in FIG. 3, a stator 21 for creating a field (field) includes an annular stator core 21a formed of, for example, laminated steel plates, and a pair of stator windings 21b attached to the stator core 21a. It has. The stator core 21a has a substantially quadrangular shape in plan view, and the four corners 21c are chamfered obliquely. The stator 21 is press-fitted into the cylindrical portion 22a of the frame 22 through its one end opening. Thereby, the four corners 21c of the stator core 21a are pressed against the inner peripheral surface of the cylindrical portion 22a, respectively, and heat conduction from the stator core 21a to the frame 22 can be performed.

  As shown in FIG. 3, there are air passages A or B between the four outer peripheral flat surface portions of the stator core 21a housed in the frame 22 and the inner peripheral surface of the cylindrical portion 22a facing each other. Is formed. The frame 23 faces the air passage A but does not face the air passage B, and the end of the stator winding 21b protruding from the stator core 21a on the one end opening side of the frame 22 is It arrange | positions so that the flame | frame 23 may be pinched | interposed.

  As shown in FIG. 2, the rotor 24 includes a rotor shaft 24 a, an armature core 24 b, an armature winding 24 c, bearings 25 and 26, and a commutator 27. Specifically, an armature core 24b is mounted on the rotor shaft 24a, and an armature winding 24c is wound around the core 24b. A commutator 27 is mounted near one end of the rotor shaft 24a. A terminal portion of the armature winding 24c is connected to each commutator piece of the commutator 27. Rolling bearings 25 and 26 are individually attached to both ends of the rotor shaft 24a.

  The rotor 24 is rotatably disposed through the central portion of the stator 21 by housing one bearing 25 in the bearing housing portion 22d and housing the other bearing 26 in the bearing housing portion 23d. ing. The end of the rotor shaft 24a supported at both ends by the motor frame MF in this manner on the bearing 26 side penetrates the bearing 26 and the bearing housing portion 23d and protrudes out of the motor frame MF.

  The pair of brush devices 28 are attached so as to pass through the cylindrical portion 22a of the frame 22 in the radial direction at 180 ° apart from each other. The tips of the carbon brushes 28a of these brush devices 28 are pressed against the peripheral surface of the commutator 27 by the urging force of the coil spring 28b.

  As shown in FIG. 2, the air blower 3b includes a metal centrifugal fan 31 and a fan cover 32 obtained by drawing a metal covering the metal fan, for example, an iron plate. The fan 31 is connected to a shaft end portion that passes through the bearing 26 of the rotor shaft 24a by a nut 33 that is screwed into the shaft end portion and tightened.

  The fan cover 32 has a suction port 32 a that faces the suction port of the fan 31. The fan cover 32 is detachably connected to the frame 22 by fitting the opening edge of the peripheral wall thereof to the fan cover mounting portion 22b.

  The blower rectifier 3c made of synthetic resin has a diffuser air passage for statically guiding the air discharged from the outlet 31b at the outer peripheral portion of the fan 31 and guiding it into the downstream motor frame MF. As shown in FIG. 2, the main part of the blower rectifier 3 c is disposed between the motor frame MF and the fan 31 and is screwed to the frame 23.

  A space G between the peripheral portion of the airflow rectifier 3c and the peripheral portion of the fan cover 32 is a portion where the wind guided into the motor frame MF is easily stagnated and the pressure loss is large. The fan cover mounting portion 22b facing the space G is provided with a plurality of wind discharge portions 34 including through holes as shown in FIG.

  As described above, the fan cover mounting portion 22b protrudes outward in the radial direction from the cylindrical portion 22a of the frame 22. For this reason, the air which distribute | circulates the wind discharge part 34 is discharged | emitted to the exterior of the flame | frame 22, and flows out along the axial direction of this cylindrical part 22a on the outer surface of the cylindrical part 22a. In opening the wind discharge portion 34, it is possible to provide the opening edge so as to be a flange protruding in the air outflow direction. In this case, the wind discharge portion 34 is discharged from the motor frame MF. It is possible to clarify the direction of wind flow.

  As shown in FIG. 4B and the like, a plurality of heat radiating fins 35 are cut out on the cylindrical portion 22a of the frame 22 to the outside. As shown in FIG. 3 and FIG. 4 (A), each radiating fin 35 is provided facing the wind exhaust portion 34 so as to be exposed to the wind exhausted from the wind exhaust portion 34.

  When the electric blower 3 having the above configuration is operated, the following blowing operation is performed. First, the air sucked into the fan 31 from the suction port 32a of the fan cover 32 and discharged from the outlet 31b of the outer peripheral portion of the fan 31 passes through the upstream diffuser air passage D1 of the air flow rectifier 3c, and then the fan The air flows into the motor frame MF through the downstream diffuser air passage D2 of the air flow rectifier 3c while turning the space G along the inner peripheral surface of the cover 32. The wind flowing into the motor frame MF flows through the air passages A and B while cooling the stator 21 and the rotor 24, and further cools the brush device 28, and then passes through the exhaust hole 22c and passes through the frame 22. It is leaked out. On the other hand, part of the wind swirling in the space G flows out of the motor frame MF through the wind discharge portion 34 communicating with the space G. The above-described cleaning is performed by such a blowing operation.

  The stator 21 of the electric blower 3 operated in this way generates heat, but its temperature rise is suppressed as follows. As described above, the stator 21 is exposed to the wind flowing through the motor frame MF, and is cooled by this wind. On the other hand, the heat of the stator core 21 a is thermally conducted to the frame 22 that is thermally coupled to the iron core 21 a and is released from the frame 22 to the surroundings. In this case, since the wind flowing out from the respective wind discharge portions 34 provided at intervals along the circumferential direction of the frame 22 flows along the outer peripheral surface of the frame 22, heat radiation to the outside of the frame 22 is performed. It is good.

  In addition, the plurality of radiating fins 35 integral with the frame 22 are exposed to the wind flowing along the outer periphery of the frame 22. In this case, in particular, since each radiating fin 35 and each wind discharge portion 34 face each other in the axial direction of the frame 22, it can be surely exposed to the wind flowing along the outer periphery of the frame 22. For this reason, the heat radiation to the outside of the frame 22 can be further improved.

  In addition, in the first embodiment, every other heat dissipating fin 35 is provided so as to be continuous with the four corners 21c of the stator core 21a carrying heat transfer to the frame 22 as shown in FIG. For this reason, the heat transfer from the stator core 21a to the other radiating fins 35 is smooth, and can be cooled by the wind flowing along the outer periphery of the frame 22 from the side where the heat is transferred. Note that other heat radiation fins provided between the alternate heat radiation fins 35 may be omitted if necessary.

  Therefore, for these reasons, the heat dissipation performance outside the motor frame MF is improved, so that the temperature of the stator 21 that is arranged in the motor frame MF and generates heat even when the air volume flowing through the motor frame MF is small. The rise can be suppressed.

  For this reason, in order to suppress the temperature rise of the stator 21, it is not necessary to secure a larger amount of air flowing through the motor frame MF. Accordingly, the air volume directly flowing out of the motor frame MF from the space G around the outer periphery of the fan 31 without passing through the motor frame MF is increased, for example, by increasing the hole diameter of the air discharge portion 34 of the fan cover mounting portion 22b. be able to. For this reason, since the pressure rise in the space G is suppressed and the windage loss there falls, motor efficiency can be improved accordingly.

  As described above, the electric blower 3 capable of improving the motor efficiency while effectively suppressing the temperature rise of the stator 21 in the frame 22 can be provided, and the electric vacuum blower 1 is provided with the electric blower 3. As the input to the blower 3 can be increased, the suction power of the vacuum cleaner 1 can be improved.

  Next, second to fourth embodiments of the present invention will be described. Since these embodiments are basically the same as the first embodiment, parts having the same configuration or function as those of the first embodiment are denoted by the same reference numerals as the corresponding parts of the first embodiment, and description thereof is made. The points different from the first embodiment will be described below.

  In the second embodiment shown in FIGS. 5A and 5B, each radiating fin 35 cut and raised from the frame 22 is twisted so as to obliquely intersect the axis of the cylindrical portion 22a.

  Except for this point, the configuration is the same as that of the first embodiment, including configurations not shown in FIGS. For this reason, also in this 2nd Embodiment, the effect | action similar to 1st Embodiment is acquired and the subject of this invention can be solved. In addition, since the air that has flowed out of the wind discharge portion 34 easily hits the twisted heat dissipating fins 35, the heat dissipating from the heat dissipating fins 35 can be further promoted.

  In 3rd Embodiment shown to FIG. 6 (A) (B), each radiation fin 35 is cut and raised from the flame | frame 22 so that it may cross | intersect at right angles with respect to the axis line of the cylindrical part 22a.

  Except for this point, the configuration is the same as that of the first embodiment including the configuration not shown in FIGS. For this reason, also in this 3rd Embodiment, the effect | action similar to 1st Embodiment is acquired, and the subject of this invention can be solved. In addition, as the opposed area of the radiating fins 35 with respect to the wind discharge portion 34 becomes larger than that in the first embodiment, the air flowing out from the wind discharge portion 34 easily hits each radiating fin 35. This is preferable in that heat dissipation from the fins 35 can be promoted.

  In the fourth embodiment shown in FIGS. 7A and 7B, the radiating fins 35 cut and raised from the frame 22 are obliquely intersected at an angle close to a substantially right angle with respect to the axis of the cylindrical portion 22a. Twisted.

  Except for this point, the configuration is the same as that of the first embodiment including configurations not shown in FIGS. For this reason, also in this 4th Embodiment, the effect | action similar to 1st Embodiment is acquired, and the subject of this invention can be solved. In addition, as the opposed area of the radiating fins 35 to the wind discharge portion 34 becomes larger than in the first embodiment, the air that has flowed out of the wind discharge portion 34 easily hits the twisted radiating fins 35. Furthermore, it is preferable in that heat radiation from each radiation fin 35 can be promoted.

The perspective view which shows the vacuum cleaner which concerns on 1st Embodiment of this invention. The side view which cuts and shows a part of electric blower with which the vacuum cleaner of FIG. 1 is provided. The front view which shows the electric motor part of the electric blower of FIG. (A) is a rear view which shows the electric blower of FIG. (B) is a side view which shows the electric blower of FIG. (A) is a rear view which shows the electric blower with which the vacuum cleaner which concerns on 2nd Embodiment of this invention is provided. FIG. 5B is a side view showing the electric blower of FIG. (A) is a rear view which shows the electric blower with which the vacuum cleaner which concerns on 3rd Embodiment of this invention is provided. FIG. 7B is a side view showing the electric blower of FIG. (A) is a rear view which shows the electric blower with which the vacuum cleaner which concerns on 4th Embodiment of this invention is provided. FIG. 7B is a side view showing the electric blower of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric vacuum cleaner 2 ... Vacuum cleaner main body 3 ... Electric blower 3a ... Electric motor part 3b ... Air blower part 4 ... Airflow guide means 6 ... Suction inlet 9a ... Dust inlet 21 ... Stator 21a ... Stator iron core 22 ... Frame (motor frame) MF)
22a ... Cylindrical part 22b ... Fan cover mounting part 23 ... Frame (motor frame MF)
24 ... Rotor 31 ... Fan 32 ... Fan cover 34 ... Wind exhaust part 35 ... Radiation fin G ... Space MF ... Motor frame

Claims (4)

A rotor having a rotor shaft, a stator arranged around the rotor, and a metal cylindrical portion surrounding the stator, and at least an outer surface of the stator on the inner surface of the cylindrical portion An electric motor unit having a frame that is in contact with a part and supporting the stator, a fan that is located outside the frame and connected to the rotor shaft, and a fan cover that covers the fan and is connected to the frame A portion of the wind discharged from the fan is discharged to the outside of the cylindrical portion through a wind discharge portion provided in a fan cover mounting portion that projects outward from the cylindrical portion, In the electric blower that distributes the remaining wind inside the frame,
An electric blower characterized in that radiating fins exposed to the wind discharged from the wind discharge section are cut and raised outward from the tubular section.   The electric blower according to claim 1, wherein the radiating fin is provided to face the wind discharge portion.   3. The electric blower according to claim 1, wherein the heat dissipating fins are cut and raised to intersect the axial direction of the cylindrical portion. A vacuum cleaner body having a dust collecting part;
The electric blower according to any one of claims 1 to 3, wherein the electric blower is located in the downstream side of the dust collecting part and is built in the cleaner body.
An airflow guide means that is located on the upstream side of the dust collecting part and is detachably connected to a suction port provided in the cleaner body, and has a dust suction port at a tip part;
The vacuum cleaner characterized by comprising.

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