JP5396868B2 - Blower - Google Patents

Description

  The present invention relates to an air blower comprising an electric motor and a blade provided with a boss portion having an engaging groove that engages with the pin and engages with the pin to prevent rotation of the blade. About.

  Conventionally, as a structure for preventing rotation between the rotating shaft and blades of the electric motor of the blower, the same shape that fits the cross-sectional shape of the inner peripheral surface of the rotating shaft and the boss portion is fixed perpendicularly to the rotating shaft. There is one that engages a pin and an engagement groove formed in the boss portion (see, for example, Patent Document 1).

  Hereinafter, the blower will be described with reference to FIGS. 6 and 7.

  As shown in FIG. 6, the rotary shaft 103 of the electric motor 102 having the flat portion 101 on the outer periphery so that the cross section forms a D shape, and the cross section of the rotary shaft 103 has the same shape as the cross section of the rotary shaft 103. The boss 107 of the blade 106 having the shaft hole 105 having the flat portion 104 on the inner periphery constitutes a detent against the rotation shaft 103 of the blade 106.

In addition, as shown in FIG. 7, the rotating shaft 111 of the electric motor 110 to which the pin 109 is fixed orthogonally and the rotating shaft 111 are inserted and engaged with the pin 109 as shown in FIG. The boss 114 of the blade 108 having the shaft hole 113 in which the engagement groove 112 forming the rotation stop is formed constitutes the rotation stop of the blade 108 with respect to the rotating shaft 111.
JP-A-8-247089

  In the configuration of the vane detent in such a conventional blower, in the configuration shown in FIG. 6, when the vane 106 is attached to the electric motor 102, the flat portion 104 of the shaft hole 105 of the boss portion 107 and the flat portion 101 of the rotating shaft 103. Therefore, there is a problem that it takes time to attach and detach the blades when assembling or maintaining the product.

  Further, in the case shown in FIG. 7, when the field of view for attaching and detaching the blade 108 is behind the ceiling or in a dark place, the rotary shaft 111 cannot be inserted well into the shaft hole 113 of the boss 114, and the rotary shaft 111 is mistakenly mistaken. Is fixed while being erroneously inserted into a groove or a hole formed outside the boss 114.

  The present invention solves such a conventional problem, and can easily align the boss portion of the blade with the rotating shaft, and can easily engage with the blade at the position where the blade is prevented from rotating. It is an object to provide a blower that can be easily attached to a fan.

  In order to achieve the above object, the blower of the present invention includes an electric motor and a blade having a boss portion into which the rotation shaft of the electric motor is fitted at the center, and a pin is fixed to the rotation shaft in an orthogonal direction. The boss portion is formed with an engagement groove that engages with the pin to prevent rotation of the blade, and the shaft is inserted into the rotation shaft insertion side end edge of the shaft hole into which the rotation shaft is inserted. A cylindrical guide rib surrounding the hole and notching the pin passage portion leading to the engagement groove is erected, and the guide rib is thick so that the outer diameter is sufficiently larger than the outer diameter of the rotating shaft. The wall has a cylindrical shape.

  Another means is formed by stealing the counter-rotating shaft insertion side of the guide rib.

  Another means is that the end surface of the guide rib on the rotating shaft insertion side is inclined so as to become lower from the outer peripheral side toward the shaft hole.

  Another means is that the inner peripheral side of the end surface on the rotation shaft insertion side of the guide rib has an R shape.

  In another means, a cylindrical guide rib having a thick wall is constituted by a double cylinder of an inner guide rib and an outer guide rib provided at a smaller interval than the outer diameter of the rotating shaft.

  Another means is that the height of the outer guide rib is higher than that of the inner guide rib.

  According to another aspect, the inner guide rib includes a first arc-shaped rib and a second arc-shaped rib which are separated from each other with the engaging groove as a boundary, and the first arc-shaped rib and the second arc-shaped rib are separated from each other. The arc-shaped ribs are obtained by inclining the rotation shaft insertion side end portions in the circumferential direction symmetrically with respect to each other with the center of the shaft hole as a reference point.

  Another means is that a drain hole is provided on the bottom surface between the outer guide rib and the inner guide rib.

  In another means, the rotating shaft is a thermosetting resin, and at least the tip is processed into a smooth surface.

  Another means is that the blades are made of a transparent resin.

  Further, the other means is a centrifugal blower in which the blade is a centrifugal blower blade and rotates and blows inside the fan casing, and a casing opening slightly larger than an outer diameter of the centrifugal blower blade is formed in the fan casing. The blade guide rib extends from the inside of the fan casing to the inside of the fan casing.

  Another means is that the centrifugal blower blade has a boss portion that is a long boss whose counter-rotating shaft insertion side end is located in the vicinity of the blade suction port.

  According to the present invention, the pin passage portion that reaches the engagement groove that surrounds the shaft hole at the rotation shaft insertion side end edge of the shaft hole of the boss portion into which the rotation shaft is fitted and engages with the pin fixed to the rotation shaft. Cylindrical guide ribs are cut up, and the guide ribs are cylindrical with thick walls so that the outer diameter is sufficiently larger than the outer diameter of the rotating shaft. It is possible to provide a blower having an effect of facilitating the alignment with the shaft hole of the part and the engagement of the pin of the rotating shaft and the engagement groove of the boss part and facilitating the attachment of the blade to the electric motor. it can.

  In addition, by stealing the counter-rotating shaft insertion side of the guide rib, the end surface of the guide rib on the rotating shaft insertion side becomes a smooth surface that does not cause sink marks, and the alignment between the rotating shaft and the shaft hole is smooth. Yes.

  In addition, since the end surface on the rotation shaft insertion side of the guide rib is inclined so as to become lower from the outer peripheral side toward the shaft hole, alignment between the rotation shaft and the shaft hole of the boss portion becomes easier.

  In addition, since the inner peripheral side of the end surface on the rotation shaft insertion side of the guide rib has an R shape, the insertion of the rotation shaft into the boss portion can be smoothly performed to the final position.

  In addition, by forming the cylindrical guide rib of the thick wall with the double cylinder of the inner guide rib and the outer guide rib provided at intervals smaller than the outer diameter of the rotating shaft, the guide rib is made into a double cylinder, thereby forming a resin. In addition to improving the workability of molding, it is possible to easily align the rotating shaft and the shaft hole of the boss portion.

  Further, since the height of the outer guide rib is made higher than that of the inner guide rib, it is easier to align the rotation shaft and the shaft hole of the boss portion.

  Further, the inner guide rib is composed of a first arc-shaped rib and a second arc-shaped rib that are separated from each other with the engaging groove as a boundary, and the first arc-shaped rib and the second arc-shaped rib are: Each end of the rotating shaft insertion side is inclined in the circumferential direction symmetrically with respect to the center of the shaft hole as a reference point, thereby facilitating the engagement between the pin of the rotating shaft and the engaging groove of the boss portion. Thus, the attachment of the blade to the rotating shaft is further facilitated.

  In addition, by providing a drain hole on the bottom surface between the outer guide rib and the inner guide rib, it is possible to discharge water droplets such as condensed water between the double cylinders without causing water droplets or shaft rust. Can be prevented.

  In addition, since the rotating shaft is thermosetting resin and at least the tip is processed into a smooth surface, the shaft can be molded by a mirror-finished mold without individual mirror finishing like a metal rotating shaft. A rotating shaft that is smoothly guided in the hole can be obtained.

  Further, since the blades are formed of a transparent resin, it is easier to align and attach the boss portion to the rotation shaft.

  Further, the blade is a centrifugal fan, and the fan is a centrifugal fan that rotates and blows air inside the fan casing. The fan casing has a casing opening that is slightly larger than the outer diameter of the centrifugal fan, and the fan opening extends from the casing opening. By extending the blade guide ribs to the inside, even if the centrifugal blower is inserted into the fan casing and attached to the rotating shaft, the blade can be easily aligned with the rotating shaft and attached.

  In addition, the centrifugal blower blade has a long boss whose end on the side opposite to the rotary shaft is located in the vicinity of the blade suction port, so that the centrifugal blower blade can be fixed even in a centrifugal blower. This facilitates the mounting operation from the alignment and fixing of the blades and the rotation shaft, and reduces the noise caused by the rotational vibration of the centrifugal blower blades.

Feed air blower of the present invention is to secure the pin in the direction perpendicular to the rotation axis, the boss portion, with the engagement groove is formed which forms the detent of the pin engagement with the blade, wherein the rotary shaft is fitted A cylindrical guide rib that surrounds the shaft hole and cuts out the pin passage portion leading to the engagement groove is provided upright at the end of the shaft hole on the rotary shaft insertion side, and the guide rib has an outer diameter of the guide rib. The guide rib is thick when the blade is attached to the electric motor by aligning the tip of the rotary shaft with the shaft hole so that it is sufficiently large relative to the outer diameter of the rotary shaft. Because it is a wall, the tip of the rotating shaft does not come out of the guide rib, making it easy to align with the position of the shaft hole, and if it can be aligned, engage the engaging groove of the pin of the rotating shaft and the boss. Also has the effect of facilitating.

It is intended to form by stealing meat counter rotary shaft insertion side of the gas Idlib, an effect that can be eliminated sink marks occur in the guide rib.

It is intended that the inclined to be lower toward the rotary shaft insertion side end face of the moth Idlib from the outer circumferential side in the axial bore, the distal end portion of the rotary shaft is guided in the shaft hole along the inclined end surface of the guide rib The

Further, the inner peripheral side of the rotary shaft insertion side end face of the moth Idlib is obtained by the R-shape, when the leading end portion of the rotary shaft is inserted into the shaft hole, into the more smoothly.

Further, the double cylinder of the inner guide rib and the outer rib provided with a small spacing than the outer diameter of the rotating shaft, which constituted the cylindrical guide rib Atsuhabakabe, when mounting the blade, the tip of the rotary shaft The portion does not come off the outer guide rib, and it is easy to match the position of the shaft hole inside the inner guide rib.

It is intended that the height of the outer side guide rib higher than the inner guide rib, tip of the rotary shaft is guided from the outer guide ribs inside the guide rib and is guided in the axial bore of the boss portion.

Further, the inner side guide rib, comprises a first arcuate rib and the second circular rib which faces separated engagement grooves the boundary, the first arcuate rib and the second arcuate rib The rotation shaft insertion side end portions are inclined in the circumferential direction symmetrically with respect to each other with respect to the center of the shaft hole as a reference point, and the pin of the rotation shaft includes the first arc-shaped rib and the second When it comes into contact with the arc-shaped rib, it is guided by an inclination from a high position to a low position and guided to the engaging groove.

Also, having thereon a bottom surface drain hole between the outer side guide rib and the inner rib, even if water drops such as dew condensation water to the boss portion, not water droplets accumulate between the double cylinder, It can be reliably discharged from the drain hole.

Further, in the rotating axis thermosetting resin, which is processed into a smooth surface of at least the tip portion, the rotation shaft tip portion is processed into a smooth face on the rotary shaft insertion side end face of the guide ribs, Smoothly guided to the shaft hole.

It is intended to form the blades of a transparent resin, when mounting the blade, can be aligned while watching the rotary shaft and vane boss.

Also, in the blades centrifugal blower blades, in the centrifugal blower for blowing rotating within the fan casing, to form a slightly larger casing opening than the outer diameter of the centrifugal fan blades to the fan casing, the fan casing from the casing opening The blade guide rib is extended to the inside of the fan, and when the centrifugal fan blade is installed, the centrifugal fan blade is tilted by inserting the outer periphery of the fan blade along the blade guide rib of the fan casing into the fan casing. It can be attached in the proper direction without any problems.

Further, centrifugal blower blades, the counter-rotating shaft insertion side end portion of the boss portion is obtained by a Nagasun boss located near the blade inlet, after fitting the rotary shaft to the boss portion, the centrifugal fan blades When fixing, it can be fixed in the vicinity of the blade suction port, and the boss portion becomes long, so that the centrifugal blower blade is attached to the rotating shaft in a stable state.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Embodiment 1)
As shown in FIG. 1, the blower of the first embodiment relates to a centrifugal blower incorporated in a ceiling-embedded ventilation fan.

  A ceiling-embedded ventilation fan is inserted and attached to the back of the ceiling through an opening formed in the ceiling, and a fan casing 5 is installed inside a frame 3 having a frame opening 1 facing the indoor side on the lower surface and a discharge adapter 2 on one side. And a centrifugal blower that is disposed in the fan casing 5 and is made of a resin-made centrifugal blower blade 7 that is fixed to the rotary shaft 8 of the electric motor 6 and is driven to rotate, and covers the frame opening 1 on the lower surface of the frame 3. A louver 9 is detachably attached.

  As shown in FIG. 2, the lower surface of the fan casing 5 has a casing opening 4 having a diameter slightly larger than the outer diameter of the centrifugal blower blade 7, and the blade enters the fan casing 5 from the edge of the casing opening 4. A guide rib 14 is extended. In addition, an engagement piece 12 (FIG. 1) in which an orifice 11 having a suction port 10 having a diameter smaller than the outer diameter of the centrifugal blower blade 7 is provided in the casing opening 4 from below, and an engagement piece. 12 is detachably attached by engaging / disengaging with a locking portion 13 (FIG. 1) provided at the position of the fan casing 5 corresponding to 12. The locking and disengagement between the locking piece 12 and the locking portion 13 is carried out by pushing up the orifice 11 by hand and releasing it with the fingertip.

  As shown in FIG. 3, a pin 15 is fixed to the rotary shaft 8 in an orthogonal direction, and an engagement groove 17 that engages with the pin 15 to prevent rotation is formed on the boss portion 16 of the centrifugal blower blade 7. In addition, a cylindrical guide rib 19 that surrounds the shaft hole 18 and is notched with a pin passage portion 19a leading to the engagement groove 17 is formed on the rotation shaft insertion side edge 18a of the shaft hole 18 into which the rotation shaft 8 is fitted. It is installed.

  As shown in FIG. 4, the guide rib 19 is a cylinder having an outer diameter that is sufficiently larger than the outer diameter of the rotating shaft 8, and stealing the counter-rotating shaft insertion side. Moreover, the rotating shaft insertion side end surface 19b has an inclined shape that decreases from the outer peripheral side toward the shaft hole 18, and the inner peripheral side has an R shape. Furthermore, the centrifugal blower blade 7 is formed of a transparent resin. Further, the boss portion 16 is a long boss portion 16 in which the end on the side opposite to the rotating shaft is extended to the vicinity of the blade suction port 21.

  Further, the rotating shaft 8 is made of a thermosetting resin using a mirror finished mold.

  When the blower having the above-described configuration is installed by inserting the rotary shaft into the centrifugal blower blade 7 that is removed by maintenance after installing the ceiling-embedded ventilation fan on the ceiling, the outer diameter of the rotary shaft 8 is attached to the rotary shaft insertion edge. Since the cylindrical guide rib 19 having a sufficiently large width is provided, the tip end portion of the rotating shaft 8 abuts on the rotating shaft insertion side end surface 19b of the guide rib 19 and is erroneously inserted into a groove or a hole outside the shaft hole 18. In addition, since the centrifugal blower blade 7 is formed of a transparent resin, this process can be visually observed and inserted more accurately, and the pin 15 and the engagement groove 17 can also be visually observed. Can be done easily and accurately.

  The guide rib 19 steals the counter-rotating shaft insertion side, and the rotating shaft insertion-side end surface 19b is inclined downward from the outer peripheral side toward the shaft hole 18, and the inner peripheral side is formed in an R shape. Therefore, the rotating shaft insertion side end surface 19b is a smooth surface that does not break and is inclined toward the shaft hole 18, and the rotating shaft 8 is molded using a mirror-finished mold. Therefore, the surface, in particular, the tip portion is formed in a smooth surface, and the rotation shaft 8 is smoothly guided in the direction of the shaft hole 18 and guided to the shaft hole 18, and the positions of the shaft hole 18 and the rotation shaft 8 are The alignment and insertion can be performed more easily and accurately.

  In addition, the centrifugal fan blade 7 is attached by inserting the centrifugal fan blade 7 into the fan casing 5 while sliding the outer periphery of the fan blade 5 on the blade guide rib 14 extending inward from the casing opening 4 of the fan casing 5. Even if the centrifugal blower blade 7 can be prevented from tilting and the axially long centrifugal blower blade 7 is inserted into the fan casing 5 and the rotary shaft 8 and the shaft hole 18 are aligned, its position Matching is easy.

  In addition, since the boss portion 16 has a length that extends the end on the side opposite to the rotation shaft insertion to the vicinity of the blade suction port 21, even the centrifugal blower blade 7 that is long in the axial direction can be attached and detached near the blade suction port 21, The work becomes easy. In addition, since the contact length between the rotary shaft 8 and the shaft hole 18 is long, the tilt of the centrifugal blower blade 7 is small and rotational vibrations are reduced, and noise is reduced.

  As described above, according to the blower of the first embodiment, when the centrifugal blower blade 7 is attached to the rotating shaft 8 of the electric motor 6, the alignment between the shaft hole 18 of the boss portion 16 and the rotating shaft 8 is easy and accurate. In addition, it is possible to easily align the pin 15 of the rotary shaft 8 and the engaging groove 17 of the boss portion 16 for preventing the centrifugal blower blade 7 from rotating with respect to the rotary shaft 8.

(Embodiment 2)
As shown in FIG. 5, the second embodiment blower is different from the first embodiment in that the configuration of the guide rib 20 of the boss portion 16A is as follows, and the other configurations are the same. The description thereof is omitted.

  As shown in the figure, the guide rib 20 is a double cylinder of an inner guide rib 20a and an outer guide rib 20b provided at a smaller interval than the outer diameter of the rotary shaft 8, and a thick wall is formed by the interval. Further, the outer guide rib 20b is provided higher than the inner guide rib 20a.

  The inner guide rib 20a includes a first arc-shaped rib 22a and a second arc-shaped rib 22b that are separated from each other with the engagement groove 17 as a boundary, and the first arc-shaped rib 22a and the second circle Each of the arc-shaped ribs 22b is inclined in the circumferential direction so as to be symmetrical with respect to each other with the center point of the shaft hole 18 as a reference point. That is, each rotation shaft insertion side end is inclined in the same circumferential direction. Further, a drain hole 23 is provided between the outer guide rib 20b and the inner guide rib 20a.

  When the blower having the above-described configuration is installed by inserting the rotary shaft 8 into the centrifugal blower blade 7 that is removed by maintenance after installing the ceiling-embedded ventilation fan on the ceiling, the outer diameter of the rotary shaft 8 is set on the boss portion 16A. Since the guide rib 20 comprising a double cylinder of the inner guide rib 20a and the outer guide rib 20b is provided at a small interval, the rotating shaft 8 is not erroneously inserted into the groove or hole outside the shaft hole 18, and Since the outer guide rib 20b extends higher than the inner guide rib 20a, when the tip of the rotary shaft 8 comes into contact with the outer guide rib 20b first, the outer guide rib 20b is inclined toward the inner guide rib 20a by the inclination between the outer guide rib 20b and the inner guide rib 20a. The rotation shaft 8 is guided and guided to the shaft hole 18 so that the alignment between the rotation shaft 8 and the shaft hole 18 is easily performed.

  Further, the first arc-shaped rib 22a and the second arc-shaped rib 22b constituting the inner guide rib 20a incline the respective rotary shaft insertion side end portions in the same circumferential direction, so that the pin 15 is Regardless of the position of the first arc-shaped rib 22a and the second arc-shaped rib 22b, the pin 15 is guided while being rotated in the same circumferential inclination and guided to the engaging groove 17.

  Further, since the drain hole 23 is provided between the outer guide rib 20b and the inner guide rib 20a, water does not accumulate even if water enters the guide rib 20 due to condensation or the like. Can be prevented.

  As described above, according to the blower of the second embodiment, the processability of the resin is improved by the double structure, and the shaft hole 18 is not fixed at the erroneous insertion position when the centrifugal blower blade 7 is attached. The rotating shaft 8 can be easily aligned with each other, and the blower provided with the centrifugal blower blade 7 guided to the engagement groove 17 by inserting the centrifugal blower blade 7 regardless of the angular position of the pin 15 is provided. be able to.

  According to the present invention, the rotating shaft of the electric motor with the pin fixed in the orthogonal direction and the boss portion of the blade having the engaging portion that engages with the pin and prevents the rotation of the blade are aligned, and the pin and the engaging groove. As a blower that can be easily engaged with and can be easily attached and detached, it is widely applied to a blower having a pin for stopping rotation of a blade and an engagement groove.

The principal part disassembled perspective view which shows the ceiling embedded type ventilation fan incorporating the air blower of Embodiment 1 of this invention. Cross section of the ceiling-embedded type Perspective view showing centrifugal blower blades and electric motor of the blower Sectional drawing which shows the centrifugal blower blade and electric motor of the blower The perspective view which shows the centrifugal ventilation blade and motor of the air blower of Embodiment 2 of this invention. The perspective view which shows the rotation prevention part with respect to the rotating shaft of the centrifugal ventilation blade of the conventional air blower. Sectional drawing which shows the rotation prevention part with respect to the rotating shaft of the centrifugal blowing blade of the other conventional air blower

4 Casing opening 5 Fan casing 6 Electric motor 7 Centrifugal blower blade 8 Rotating shaft 14 Blade guide rib 15 Pin 16 Boss portion 16A Boss portion 17 Engaging groove 18a Rotating shaft insertion side edge 18 Shaft hole 19 Guide rib 19a Pin passage portion 19b Rotating shaft insertion Side end face 20 Guide rib 20a Inner guide rib 20b Outer guide rib 21 Blade inlet 22a First arc-shaped rib 22b Second arc-shaped rib 23 Drain hole

Claims (3)

An electric motor, and a blade having a boss portion into which the rotating shaft of the electric motor is fitted at the center, a pin fixed to the rotating shaft in an orthogonal direction, and the boss portion is engaged with the pin and the An engagement groove is formed to prevent rotation of the blades, and a pin passage portion that surrounds the shaft hole at the rotation shaft insertion side end edge of the shaft hole into which the rotation shaft is fitted and reaches the engagement groove is provided. A notched cylindrical guide rib is erected, and the guide rib has a cylindrical shape with a thick wall so that the outer diameter is sufficiently larger than the outer diameter of the rotating shaft, and the opposite side of the guide rib on the side opposite to the rotating shaft is inserted. It is formed by stealing, and the end surface of the guide rib on the rotation shaft insertion side is inclined from the outer peripheral side toward the shaft hole, and the engagement groove and the guide rib face the engagement groove. Connected to the inclined surface formed radially inward. Blower, wherein the rotary shaft is R shape is guided while being guided by the shaft hole direction. The blower according to claim 1, wherein the rotating shaft is a thermosetting resin and at least the tip is processed into a smooth surface. The blower according to claim 1, wherein the blades are made of a transparent resin.

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