JP2007002770A - Motored fan, and electric vacuum cleaner equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the efficiency of a motored fan and an electric vacuum cleaner, by smoothing an air flow from a blade (vane) to a return. <P>SOLUTION: In this motored fan, a diffuser is composed of a diffuser vane body 121 which is integrally formed to an annular supporting body arranged on a fan casing side and has two or more vanes on the end bracket side of the annular supporting body, and a return guide 122 which has two or more return vanes 115d integrally formed with a partition board on the other side of the partition board with one side brought into contact with two or more vanes. The peripheral end diameter of the vane on the annular supporting body side is set larger than the peripheral end diameter of the vane on the partition board side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric blower and a vacuum cleaner including the electric blower, and more particularly to improvement of a diffuser.

  Conventional electric blowers have technologies disclosed in Patent Documents 1 and 2, for example. In Patent Document 1, an annular ring 24 is provided between the upper surface of the diffuser 13 and the fan casing 15 covering the diffuser 13 so as to seal a gap between the fan casing 15 and the upper surface of the diffuser 13 in contact with the fan casing 15. Have been disclosed.

  In Patent Document 2, an annular portion 24 is integrally formed with a diffuser blade 23 (vane), and a lower surface 25 of the blade 23 and a diffuser shroud plate 26 (partition plate) are joined. Technology is disclosed.

Japanese Patent Laid-Open No. 11-182497 JP 2000-73993 A (0027, FIG. 4)

  In a general electric blower, the outer peripheral side of the diffuser is covered with a fan casing, and the air flowing out from the centrifugal fan is guided to the blade (vane) of the diffuser, and the air passing through the blade (vane) is directed toward the outer peripheral direction. leak. The outflowed air hits the fan casing, the direction of the flow is changed, and the air flows to the return guide. The air flowing from the blade (vane) to the return has a large flow loss because the direction of the air flow changes as described above, and smoothing the flow in this portion is effective in improving the efficiency of the electric blower.

  However, in the technique described in Patent Document 1, the air flowing through the air passage formed by the fan casing 15 and the diffuser 13 flows out from the gap between the fan casing 15 and the upper surface of the diffuser 13 to another air passage. Although the electric blower is prevented and the performance of the electric blower is improved, the air flow from the diffuser 13 to the return guide 14 is not considered at all.

  In the technique described in Patent Document 2, as in Patent Document 1, the air flow from the diffuser blade 23 to the return guide 14 is not considered at all.

  The object of the present invention is to solve the above-mentioned problems, to smooth the air flow from the blade (vane) to the return, and to improve the efficiency of the electric blower and the vacuum cleaner.

  In order to achieve the above object, the present invention is characterized by an electric motor having a rotor and a stator, a housing for housing the electric motor, a rotating shaft provided in the rotor, and a bearing for the rotating shaft. Holding an end bracket, a centrifugal fan fixed to the rotating shaft outside the end bracket, a diffuser disposed on the outer peripheral side of the centrifugal fan and outside the end bracket, and A centrifugal fan and a fan casing provided so as to cover the diffuser from the outside, and the diffuser is integrally formed with an annular support provided on the fan casing side, and is disposed on the end bracket side of the annular support. A diffuser vane body having a plurality of vanes, and the partition plate disposed on the other side of the partition plate arranged so that one side is in contact with the plurality of vanes Integrally formed of a return guide having a plurality of return vanes which is molded, the outer peripheral end outer diameter of the vanes of the annular support side, in the electric blower which is greater than the outer peripheral edge outside diameter of the partition plate vane.

  Further, the present invention is characterized in that an electric motor having a rotor and a stator, a housing for housing the electric motor, a rotating shaft provided in the rotor, and an end bracket for holding a bearing of the rotating shaft. A centrifugal fan fixed to the rotating shaft outside the end bracket, a diffuser disposed on the outer peripheral side of the centrifugal fan and outside the end bracket, the centrifugal fan, and the diffuser The diffuser has a plurality of vanes on the end bracket side of the annular support body, and the diffuser is integrally formed with the annular support body provided on the fan casing side. On the other side of the diffuser vane body and the partition plate disposed so that one side is in contact with the plurality of vanes, a composite plate integrally formed with the partition plate is formed. A return guide having a return vane of the plurality of vanes, and the outer peripheral ends of the plurality of vanes are arranged such that the vanes on the partition plate side are positioned upstream of the vanes on the annular support side in terms of air flow. The electric blower is inclined from the annular support side toward the partition plate side.

  Further, the present invention is characterized in that a dust collecting unit for storing dust and a vacuum cleaner body incorporating an electric blower for generating a suction force, and a suction body communicating with the dust collecting unit of the vacuum cleaner body are provided. In the vacuum cleaner, the electric blower includes an electric motor having a rotor and a stator, a housing that houses the electric motor, a rotary shaft that is provided on the rotor, and an end bracket that holds a bearing of the rotary shaft. A centrifugal fan fixed to the rotating shaft outside the end bracket, a diffuser disposed on the outer peripheral side of the centrifugal fan and outside the end bracket, and the centrifugal fan and the diffuser. A fan casing provided so as to cover from the outside, and the diffuser is integrally formed with an annular support provided on the fan casing side. A return having a diffuser vane body having a plurality of vanes on the end bracket side and a plurality of return vanes integrally formed with the partition plate on the other side of the partition plate arranged so that one side is in contact with the plurality of vanes The outer peripheral end outer diameter of the vane on the annular support side is greater than the outer peripheral end outer diameter of the vane on the partition plate side.

  Further, the present invention is characterized in that it includes a dust collecting part for storing dust, a vacuum cleaner body incorporating an electric blower for generating suction force, and a suction body communicating with the dust collecting part of the vacuum cleaner body. In the electric vacuum cleaner, the electric blower includes an electric motor having a rotor and a stator, a housing that houses the electric motor, a rotary shaft that is provided on the rotor, and an end bracket that holds a bearing of the rotary shaft. A centrifugal fan fixed to the rotating shaft outside the end bracket, a diffuser disposed on the outer peripheral side of the centrifugal fan and outside the end bracket, the centrifugal fan, and the diffuser A fan casing provided so as to cover from the outside, and the diffuser is integrally formed on an annular support provided on the fan casing side. A diffuser vane body having a plurality of vanes on the end bracket side of the body, and a plurality of return vanes integrally formed with the partition plate on the other side of the partition plate arranged so that one side is in contact with the plurality of vanes. A plurality of vanes, the outer peripheral ends of the plurality of vanes from the annular support side so that the vanes on the partition plate side are positioned upstream from the vanes on the annular support side in terms of air flow. The vacuum cleaner is inclined toward the partition plate side.

According to the present invention, the direction can be smoothly changed in the curved flow path from the vane to the return vane, the pressure loss can be reduced, and the efficiency of the electric blower and the vacuum cleaner can be improved.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 7 is a schematic view of a vacuum cleaner 200 according to an embodiment of the present invention, and FIG. 8 is a longitudinal sectional view of an electric blower according to an embodiment of the present invention.

  In FIG. 7, 201 is a vacuum cleaner main body, 202 is a dust collecting unit that accommodates dust, 203 is an electric blower that generates a suction force for conveying dust to the dust collecting unit 202, and 704 is a control that controls the electric blower 203. The dust collecting unit 202, the electric blower 203, and the control unit 204 are housed in the cleaner body. The dust collection unit 202 contains a disposable paper pack filter. The dust collection unit 702 may be a cyclone dust collection unit.

  205 is a hand handle portion provided with an operation unit for turning on / off the electric blower, etc. 206 is connected to the vacuum cleaner main body 201 at one end side and communicates with the dust collecting portion 202, and the other end side is one end of the hand handle portion 205. A hose connected to the side, 207 is an extension pipe whose one end is connected to the other end of the hand handle 205, and 208 is a mouthpiece connected to the other end of the extension pipe 207.

  When the user presses the operation unit of the hand handle unit 205, the control unit 204 receives the information and operates the electric blower 203. When the electric blower 203 starts operation, a suction force is generated, and dust is sucked from the suction body 208. The suction body 208 and the dust collecting part 202 communicate with each other, and dust sucked from the suction body 208 is accommodated in the dust collecting part 202 through the extension pipe, the passage of the hand handle part 205, and the hose.

  Next, the configuration of the electric blower will be described with reference to FIG. Reference numeral 101 denotes a rotor, reference numeral 102 denotes a stator disposed on the outer peripheral side of the rotor 101, and reference numeral 103 denotes a commutator, which constitute an electric motor. Reference numeral 104 denotes a rotating shaft fixed to the rotor and the commutator 103, 105 and 106 denote bearings that rotatably hold the rotating shaft 104, 107 denotes a carbon brush that is in sliding contact with the commutator 103, and 108 denotes a carbon brush 107 that connects the commutator 103. A spring 109 serving as an urging means that presses the pin is electrically connected to the carbon brush.

  110 is a housing that houses the motor and holds the bearing 105, 111 is a brush holder that holds the carbon brush 107 and is fixed to the housing 110, and 112 is an end bracket that is provided on the opening side of the housing 110 and holds the bearing 106. is there. Reference numeral 113 denotes a centrifugal fan, which is fixed to the rotating shaft by a nut 114. 115 is a diffuser arranged on the outer peripheral side of the centrifugal fan 113, and 116 is a fan casing arranged so as to cover the centrifugal fan 113 and the diffuser 115 from the outside.

  An opening 116 a for sucking air is formed at the center of the fan casing 116. The centrifugal fan 113 includes a shroud 113a having an opening communicating with the opening 116a of the fan casing 116, a hub 113b fixed to the rotating shaft, and a blade 113c disposed between the shroud 113a and the hub 113b. ing.

  The diffuser 115 includes a plurality of vanes 115a disposed on the outer peripheral side of the centrifugal fan 113, an annular support member 115b provided on the upper side (fan casing) of the vane 115a, and a lower side (end bracket) side of the vane 115a. It comprises a partition plate 115c provided and a return vane 115d provided on the lower side (end bracket) side of the partition plate 115c.

  When the rotor 101 of the electric motor rotates, the centrifugal fan 113 attached via the rotating shaft 104 rotates, and air is sucked from the opening communicating with the opening 116a of the fan casing 116, and air is discharged from the outer peripheral side of the centrifugal fan 113. Leaks. The air exiting from the centrifugal fan 113 flows into the vane 115a and flows out from the outer peripheral side of the vane 115a. Then, the air that has flowed out collides with the fan casing 116, the direction of the flow is changed, the air flows toward the inside of the electric blower, and flows into the return vane 115d. Then, it enters the housing 101 from the opening of the housing 101, cools the electric motor, and is discharged from the openings formed on the side surface and the bottom surface of the housing 101.

  As described above, the air flowing out from the outer peripheral side of the vane 115a collides with the fan casing 116, the flow is changed in direction and flows into the return vane 115d, and thus the loss of the flow occurs and the efficiency of the electric blower is reduced. It was. Smoothly changing the direction greatly contributes to the efficiency of the electric blower.

  Hereinafter, a configuration for smoothly changing the direction will be described with reference to FIGS.

1 is an exploded perspective view of a diffuser 115 according to an embodiment of the present invention, FIG. 2 is a front perspective view of the diffuser 115 according to an embodiment of the present invention, and FIG. 3 is a perspective view of the diffuser 115 according to an embodiment of the present invention. 4 is a side view of the diffuser 115 according to one embodiment of the present invention, FIG. 5 is a diagram showing the dimensional relationship of the diffuser 115 according to one embodiment of the present invention, and FIG. 6 is one embodiment of the present invention. It is the top view which removed the annular support body 115b from the diffuser 115 which concerns.
1 to 5, the annular support member 115b is formed of a ring-shaped member having a large opening at the center where the centrifugal fan 113 is disposed, and a plurality of vanes curved on one surface (lower surface in this embodiment). 115a is provided to constitute the diffuser vane body 121. The plurality of vanes 115a and the annular support 115b are integrally formed by injection molding or the like. In molding, the resin is injected into the upper and lower split molds, and when the resin is hardened, the mold is separated in the vertical direction, and the diffuser vane body 121 is taken out.

  In addition, the partition plate 115c has an opening for passing the rotating shaft 104 for connecting to the centrifugal fan 113 at the center, and a plurality of curved return vanes 115d are provided on one surface (the lower surface in this embodiment). A return guide 122 is configured. The plurality of return vanes 115d and the partition plate 115c are integrally formed by injection molding or the like. In molding, the resin is injected into the upper and lower split molds, and when the resin is solidified, the mold is separated in the vertical direction, and the return guide 122 is taken out.

  The formed diffuser vane body 121 and the return guide 122 constitute the diffuser 115 by bringing the plurality of vanes 115 a of the diffuser vane body 121 into contact with the partition plate 115 c of the return guide 122. In abutting the diffuser vane body 121 with the return guide 122, the positional relationship between the plurality of vanes 115a and the plurality of return vanes 115d is important. In the case where the diffuser vane body 121 and the return guide 122 are independently molded and combined to form the diffuser 115 as in the present embodiment, there is a concern about the positional deviation between the plurality of vanes 115a and the plurality of return vanes 115d. . Therefore, in this embodiment, positioning portions are provided in each of the diffuser vane body 121 and the return guide 122. Reference numeral 123 denotes a plurality of (two in the present embodiment) positioning portions a provided on the outer periphery of the diffuser vane body 121, and the outer periphery of the annular support 115b is recessed toward the inner periphery. Reference numeral 124 denotes a positioning portion b provided on the return guide 122, which is formed so as to penetrate the partition plate 115c.

  When the diffuser vane body 121 and the return guide 122 are brought into contact with each other, the combination device (not shown) is first mounted by overlapping the two. In the combination device, first, a rod-like member comes out toward the return guide 122 and is inserted into the positioning portion b124, and the return guide 122 is rotated in the horizontal direction as indicated by the arrow in FIG. 1 and stopped at a predetermined position. Thus, the return guide 122 is positioned. Next, a claw-like member is hooked on positioning portions a provided at two locations of the annular support member 115b to sandwich the annular support member 115b from the outer peripheral side, and the diffuser vane member 121 is rotated in the horizontal direction and stopped at a predetermined position. Thus, the diffuser vane body 121 is positioned. When the positioning of the diffuser vane body 121 and the return guide 122 is completed, the plurality of vanes 115a and the partition plate 115c are joined by ultrasonic welding, an adhesive, or the like as shown in FIG. After joining, if this joint part is painted, the slight gap produced between the several vane 115a and the partition plate 115c will be filled, and the efficiency of an electric blower will improve more. Further, a seal member 125 is provided on the upper surface (fan casing 116) side of the annular support body 115b so as to be in contact with the inner surface of the fan casing 116 to be airtight when the diffuser 115 is covered with the fan casing 116.

Next, the dimensional relationship of the diffuser 115 will be described with reference to FIG. In FIG. 5, D _4S is the outer peripheral end outer diameter (vane 115a ₁ ) of the vane 115a on the annular support side (the shroud side of the centrifugal fan 113), and D _4h is the outer peripheral end outer diameter of the vane 115a on the partition plate side (vane 115a _2). ), D ₅ is the outer diameter of the outer end of the return vane 115 d, and D ₆ is the inner diameter of the fan casing 116. Each dimension relationship _is a _{D 5 <D 4h <D 4S} <D 6. As can be seen from this relation, the outer peripheral edge outside diameter of the vane 115a ₁ of the annular support 115b side is larger than the outer peripheral edge outside diameter of the vane 115a ₂ of the partition plate 115c side. The shape of view, the outer peripheral end of the vane 115a is, vanes 115a vanes 115a ₂ of the partition plate 115c side is positioned on the upstream side as seen vane 115a ₁ from the air flow manner of the annular support side annular support It inclines toward the partition plate 115c side from the body 115b side.

  Next, the configuration of the partition plate 115c will be described with reference to FIG. In a state where the vane 115a and the partition plate 115c are joined, an air passage 130 is formed between the plurality of vanes 115a. A substantially triangular notch 131 is provided on the outer peripheral side portion of the partition plate 115 c on the air outlet side of the air passage 130. Although the outer peripheral sides of the vane 115a and the partition plate 115c are covered with the fan casing 116, the notch 131 is provided in the outer peripheral portion of the partition plate 115c, so that a large space 132 is provided between the partition plate 115c and the fan casing 116. Is formed.

Hereinafter, the operation | movement in which a direction change is performed smoothly is demonstrated using FIGS. In the present embodiment as described above, the outer peripheral edge outside diameter of the vane 115a ₁ of the annular support 115b side is larger than the outer peripheral edge outside diameter of the vane 115a ₂ of the partition plate 115c side. Comparing the static pressure in the annular support 115b side of the vane 115a ₁ portion and the partition plate 115c side of the vane 115a ₂ parts at the outlet (diffuser 115 outer peripheral side) of the vane 115a, the annular support 115b vane 115a ₁ high pressure near the vane 115a ₂ near the pressure of the partition plate 115c side becomes lower. That is, in the curved flow path from the vane 115a to the return vane 115d, the pressure on the annular support 115b side that is the outer side (outer peripheral side) of the bend is high, and the pressure on the partition plate 115c side that is the inner side (inner peripheral side) of the bend. Lower. For this reason, a pressure gradient is generated from the annular support member 115b side toward the partition plate 115c side, and the flow is bent from the annular support member 115b side toward the partition plate 115c side. In the curved flow path from the vane 115a to the return vane 115d, the direction is smoothly changed, the pressure loss is reduced, and the efficiency of the electric blower can be improved.

  Further, in the present embodiment, the notch 131 is provided in the outer peripheral portion of the partition plate 115c, and a large space is formed between the partition plate 115c and the fan casing 116, so that the bent flow from the vane 115a to the return vane 115d is performed. In the road, the direction can be changed more smoothly, the pressure loss can be reduced, and the efficiency of the electric blower can be greatly improved.

In a diffuser used for a general electric blower, a vane and a return vane are integrally formed on the upper and lower surfaces of the partition plate, respectively. In molding, the mold is divided into two parts on the basis of the partition plate, and after pouring the resin into the mold by injection molding, the mold is separated in the vertical direction when the resin hardens, and the diffuser is configured. . Annular support 115b side of the outer peripheral edge outside diameter of the vane 115a _1, when larger than the outer peripheral edge outside diameter of the vane 115a ₂ of the partition plate 115c side, the inclined portion inclined partition plate 115c is configured as in this embodiment Is undercut with respect to the mold separation direction.

  For this reason, it becomes impossible to mold the mold with a vertically divided structure as in the prior art. Therefore, in this embodiment, the plurality of vanes 115a and the annular support 115b are integrally formed by injection molding or the like, and the plurality of return vanes 115d and the partition plate 115c are integrally formed by injection molding or the like, and both are joined. Therefore, there is no undercut region when forming the diffuser, and it is possible to provide a diffuser that can improve the efficiency of the electric blower with a simple configuration.

It is a disassembled perspective view of the diffuser 115 which concerns on one Example of this invention. It is a front perspective view of the diffuser 115 which concerns on one Example of this invention. It is a back surface perspective view of the diffuser 115 which concerns on one Example of this invention. It is a side view of the diffuser 115 which concerns on one Example of this invention. It is a figure which shows the dimensional relationship of the diffuser 115 which concerns on one Example of this invention. It is the top view which removed the annular support body 115b from the diffuser 115 which concerns on one Example of this invention. It is the schematic of the vacuum cleaner 200 which concerns on one Example of this invention. It is a longitudinal section of an electric blower concerning one example of the present invention.

Explanation of symbols

113 ... Centrifugal fan, 115 ... Diffuser, 115a ... Vane, 115b ... Annular support, 115c ... Partition plate, 115d ... Return vane, 116 ... Fan casing, 121 ... Diffuser vane body, 122 ... Return guide, 131 ... Notch, 132 ... space, 203 ... electric blower.

Claims (7)

An electric motor having a rotor and a stator, a housing for housing the electric motor, a rotating shaft provided in the rotor, an end bracket for holding a bearing of the rotating shaft, and an outer side of the end bracket; A centrifugal fan fixed to the rotating shaft, a diffuser disposed on the outer peripheral side of the centrifugal fan and outside the end bracket, and a fan provided to cover the centrifugal fan and the diffuser from the outside A casing,
The diffuser is integrally formed with an annular support provided on the fan casing side, and has a diffuser vane body having a plurality of vanes on an end bracket side of the annular support, and one side is in contact with the plurality of vanes. A return guide having a plurality of return vanes integrally formed with the partition plate on the other side of the partition plate,
An electric blower characterized in that an outer peripheral end outer diameter of the annular support side vane is larger than an outer peripheral end outer diameter of the partition plate side vane. An electric motor having a rotor and a stator, a housing for housing the electric motor, a rotating shaft provided in the rotor, an end bracket for holding a bearing of the rotating shaft, and an outer side of the end bracket; A centrifugal fan fixed to the rotating shaft, a diffuser disposed on the outer peripheral side of the centrifugal fan and outside the end bracket, and a fan provided to cover the centrifugal fan and the diffuser from the outside A casing,
The diffuser is integrally formed with an annular support provided on the fan casing side, and has a diffuser vane body having a plurality of vanes on an end bracket side of the annular support, and one side is in contact with the plurality of vanes. A return guide having a plurality of return vanes integrally formed with the partition plate on the other side of the partition plate,
The outer peripheral ends of the plurality of vanes are inclined from the annular support side toward the partition plate side so that the vanes on the partition plate side are located upstream from the vanes on the annular support side in terms of air flow. An electric blower characterized by having been made. In claim 1 or 2,
The electric blower, wherein the plurality of vanes and the partition plate are joined by welding or an adhesive. In claim 3,
An electric blower characterized in that each of the diffuser vane body and the return guide is provided with a positioning portion for positioning each other when joining. In claim 3,
An electric blower characterized in that the joined portions are painted. In a vacuum cleaner comprising a dust collecting part for storing dust and a vacuum cleaner body incorporating an electric blower for generating suction, and a suction body communicating with the dust collecting part of the vacuum cleaner body,
The electric blower includes an electric motor having a rotor and a stator, a housing that houses the electric motor, a rotary shaft that is provided on the rotor, an end bracket that holds a bearing of the rotary shaft, and an end bracket A centrifugal fan fixed to the rotating shaft on the outer side, a diffuser disposed on the outer peripheral side of the centrifugal fan and on the outer side of the end bracket, and the centrifugal fan and the diffuser are covered from the outside A fan casing provided in the
The diffuser is integrally formed with an annular support provided on the fan casing side, and a diffuser vane body having a plurality of vanes on the end bracket side of the annular support, and one side is in contact with the plurality of vanes. The other side of the arranged partition plate is composed of a return guide having a plurality of return vanes integrally formed with the partition plate,
The vacuum cleaner characterized in that an outer peripheral end outer diameter of the annular support side vane is larger than an outer peripheral end outer diameter of the partition plate side vane. In a vacuum cleaner comprising a dust collecting part for storing dust and a vacuum cleaner body incorporating an electric blower for generating suction, and a suction body communicating with the dust collecting part of the vacuum cleaner body,
The electric blower includes an electric motor having a rotor and a stator, a housing that houses the electric motor, a rotary shaft that is provided on the rotor, an end bracket that holds a bearing of the rotary shaft, and an end bracket A centrifugal fan fixed to the rotating shaft on the outer side, a diffuser disposed on the outer peripheral side of the centrifugal fan and on the outer side of the end bracket, and the centrifugal fan and the diffuser are covered from the outside A fan casing provided in the
The diffuser is integrally formed with an annular support provided on the fan casing side, and a diffuser vane body having a plurality of vanes on the end bracket side of the annular support, and one side is in contact with the plurality of vanes. The other side of the arranged partition plate is composed of a return guide having a plurality of return vanes integrally formed with the partition plate,
The outer peripheral ends of the plurality of vanes are inclined from the annular support side toward the partition plate side so that the vanes on the partition plate side are located upstream from the vanes on the annular support side in terms of air flow. A vacuum cleaner characterized by having been made.

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