JP4944752B2 - Impeller of centrifugal multiblade fan and method of handling the impeller - Google Patents

Description

  The present invention relates to an impeller of a centrifugal multiblade fan and a method of handling the impeller.

The impeller of the centrifugal multiblade fan is disposed in the scroll casing and generates an air flow by rotating itself.
Specifically, for example, the impeller of a centrifugal multiblade fan disclosed in Patent Document 1 has a circular end wall when viewed from above, and a motor drive shaft is connected to the center of the end wall. One end of a plurality of blades is fixed to the outer peripheral portion of the end wall, and the other end of the blade is fixed to the shroud ring. The shroud ring is positioned coaxially with the end wall via the blade, and is disposed in the vicinity of the bell mouth of the scroll casing.

The blades are arranged with a gap in the circumferential direction of the outer peripheral portion of the end wall and the shroud ring, and when the impeller rotates, the air sucked from the bell mouth is blown out in a substantially tangential direction of the impeller through the gap between the blades. .
Japanese Patent Laid-Open No. 10-274198

  When transporting the impellers of the above publication together, for example, arrange a plurality of impellers in a case for transporting, then spread an insole board on them, and further spread the impeller on the insole board . Without an insole plate, the positions of the upper and lower impellers in the case shift and the upper impeller tilts, making the arrangement of the impellers in the case messy and difficult to pack the impellers Because.

Further, when an operator tries to carry a plurality of impellers without putting them in the case, the positions of the upper and lower impellers are shifted even if the impellers are stacked. For this reason, it was difficult to carry many impellers simultaneously without using a case.
Alternatively, even when the impellers were simply placed on top of each other, the position of the upper and lower blades shifted with a slight shake and was easily collapsed.

In particular, in an impeller integrally molded using a resin as a raw material, since the surface is smooth and the mass is light, the impeller is easily slipped, and the positions of the impellers are easily displaced.
The present invention has been made based on the above-mentioned circumstances, and an object thereof is to provide an impeller of a centrifugal multiblade fan that is easy to handle and a method of handling the impeller.

  In order to achieve the above object, according to the present invention, a plurality of blades formed integrally with both the outer peripheral portion of the end wall and the shroud ring and arranged in the circumferential direction of the outer peripheral portion of the end wall and the shroud ring are provided. In the impeller of the centrifugal multiblade fan, a centrifugal type is characterized in that one of the end portion of the blade on the end wall side and the shroud ring is formed with a recess corresponding to the other shape. An impeller of a multiblade blower is provided (claim 1).

Preferably, the end wall, the shroud ring, and the blade are made of a resin material.
Moreover, according to this invention, in the handling method of the impeller of the centrifugal multiblade fan of Claim 1 or 2, The said end wall in another impeller with respect to the shroud ring of one said impeller A centrifugal multi-blade characterized in that when the end portion of the blade on the side is brought into contact, the other end is fitted into a recess formed in one of the end portion of the blade on the end wall side and the shroud ring A method for handling an impeller of a blower is provided (claim 3).

  Since the impeller of the centrifugal multiblade fan according to claim 1 of the present invention has a recess at the end of the shroud ring or blade, the end of the blade or the shroud ring is recessed when the two impellers are overlapped. It is inserted in. For this reason, when the impellers are stored or transported in a superposed state, the impellers are not shifted from each other. As a result, the impeller of this centrifugal multiblade fan is easy to handle.

In the impeller of the centrifugal multiblade fan according to claim 2, even if the shroud ring and the blade resin material are made of slippery material, the blade end portion or the shroud ring is fitted into the recess so that the two impellers are It is reliably suppressed that the impellers are displaced when they are superposed.
According to the handling method of the impeller of the centrifugal multiblade fan according to claim 3, when the end of the blade in one impeller and the shroud ring of the other impeller are brought into contact with each other, the end of the blade or the shroud By fitting the ring into the recess, the impellers are not displaced from each other in the contacted state. Therefore, according to this method of handling an impeller, the impellers of a plurality of centrifugal multiblade fans can be easily stored or transported.

FIG. 1 schematically shows a centrifugal multiblade fan. The blower is used, for example, in a blower unit of a vehicle air conditioner. In that case, the blower is disposed between the inside / outside air switching damper 2 and the evaporator 4 in the air flow direction.
More specifically, the blower has a casing (scroll casing) 6 made of, for example, resin, and the scroll casing 6 constitutes a part of a duct (housing) of the blower unit. That is, the scroll casing 6 has a bell mouth 6a as a suction hole, a blowout hole 6b, and an internal flow path.

The blower has an electric motor 8 and is attached to the scroll casing 6 from the side opposite to the bell mouth 6a. An impeller housed in the scroll casing 6 is fixed to the rotating shaft of the electric motor 8.
FIG. 2 shows an impeller of a centrifugal multiblade fan according to an embodiment. The impeller is made of resin such as polypropylene, and is manufactured by integral molding such as injection molding.

The impeller has an end wall 10 that is circular in plan view. A dome-shaped cone portion 12 is formed at the center of the end wall 10, and the cone portion 12 covers the main body of the electric motor 8 protruding into the scroll casing 6. A boss portion 14 is integrally formed at the center of the cone portion 12, and the boss portion 14 is fixed so as to be integrally rotatable with respect to the rotation shaft of the electric motor 8.
The outer peripheral portion 16 of the end wall 10 is integrally connected to the outer peripheral edge of the cone portion 12. The outer peripheral portion 16 has an annular shape, and one end portions of a plurality of blades 18 are integrally connected to the outer peripheral portion 16. These blades 18 are arranged concentrically around the boss portion 14, that is, the rotation axis of the electric motor 8, and each blade 18 extends in parallel with the boss portion 14 of the electric motor 8.

These blades 18 are arranged with a predetermined gap in the circumferential direction of the outer peripheral portion of the end wall 10, and the other end portion of the blade 18 is an annular shroud ring 20 provided coaxially with the end wall 10. It is connected to one.
The shroud ring 20 has, for example, an L-shaped cross-sectional shape, and has a portion (hereinafter referred to as a cylindrical portion 22) that protrudes in the rotation axis direction (axial direction) of the impeller. A plurality of recesses 24 are formed at the tip of the cylindrical portion 22, and these recesses 24 are formed so as to correspond to the shape of one end portion of the blade 18 on the end wall 10 side.

  More specifically, FIG. 3 is a part of a plan view of the impeller viewed from the shroud ring 20 side, and shows a relative positional relationship between the recess 24 and the blade 18. The period of the recess 24 in the circumferential direction of the shroud ring 20 is the same as the period of the blade 18. The shape of the recess 24 is slightly larger than the dotted line portion of the blade 18 that crosses the cylindrical portion 22 of the shroud ring 20 as seen in the plan view of FIG.

In other words, the recess 24 is formed in the region of the tip of the cylindrical portion 22 where the shadow of the blade 18 overlaps when projected in the longitudinal direction of the blade 18.
As is clear from FIG. 3, the inner diameter of the cylindrical portion 22 of the shroud ring 20 is larger than the outer diameter of the end wall 10. The blade 18 extends from the outer peripheral portion of the end wall 10 while being curved obliquely outward in the radial direction beyond the outer peripheral edge of the end wall 10 and the inner peripheral edge of the cylindrical portion 22. Therefore, a part of the blade 18 crosses the cylindrical portion 22 when viewed in FIG.

When viewed in FIG. 3, the two side walls of each recess 24 are spaced apart from each other in the circumferential direction of the shroud ring 20, in other words, in the thickness direction of the blade 18. Approximately equal to the curvature of the portion of the blade 18 that crosses 22. For this reason, the two side walls of each recess 24 extend along the portion of the blade 18 that crosses the cylindrical portion 22.
4 and 5 exemplify a method for handling the impeller of the above-described centrifugal multiblade fan by a plurality of two or more. In this case, one end of the blade 18 in one impeller and the shroud ring 20 of the other impeller are brought into contact with each other, and the one end of the blade 18 is fitted into the recess 24 of the cylindrical portion 22 of the shroud ring 20. As a result, one end of the blade 18 abuts against the bottom surface of the recess 24 and is sandwiched between both side walls of the recess 24.

Thus, according to the impeller of the centrifugal multiblade blower described above, even if a plurality of impellers are stacked and stored or transported by fitting the cylindrical portion 22 of the shroud ring 20 into the recess 24, the impellers can be connected to each other. There is no slippage. As a result, the impeller of this centrifugal multiblade fan is easy to handle.
Moreover, in the impeller of the centrifugal multiblade blower described above, even if the shroud ring 20 and the blade 18 are made of a resin material and are slippery, the cylindrical portion 22 of the shroud ring 20 is fitted into the recess 24, so that 2 When the two impellers are overlapped, the impellers are reliably prevented from shifting.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
For example, the shape of each recess 24 may be a shape that can accept the end portion of the corresponding blade 18 when two impellers are brought into contact with each other.
Moreover, in the impeller mentioned above, although the circumferential direction position of the dent 24 and the braid | blade 18 was the same, if the period (interval) was the same mutually, as shown in FIG. A recess 26 may be formed at the position. In this case, if the two impellers are relatively rotated, the recess 26 receives the corresponding end portion of the blade 18 when the two impellers are brought into contact with each other.

  Further, in the above-described impeller, the recess 24 is formed in the cylindrical portion 22 of the shroud ring 20. However, as shown in FIGS. 7 and 8, the shroud ring is formed at the end of the blade 18 on the end wall 10 side. You may form the dent 28 corresponding to the shape of the 20 cylindrical parts 22, respectively. In this case, when the two impellers are brought into contact with each other, the recess 28 receives the portion of the cylindrical portion 22 of the corresponding shroud ring 20.

The two side walls of the recess 28 are separated from each other in the radial direction of the shroud ring 28, and the curvature of the two side walls of the recess 28 is substantially equal to the curvature of the shroud ring 28. Therefore, the two side walls of the recess 28 extend along the inner peripheral surface or the outer peripheral surface of the shroud ring 28, respectively.
Although the above-described impeller is made of resin, it may be made of metal. However, since the resin impeller is lighter and slippery, the present invention is suitable for the resin impeller.

FIG. 2 is a perspective view schematically showing a centrifugal multiblade fan with a part of its scroll casing cut away. It is a perspective view showing the impeller of one embodiment roughly. It is the top view which looked at a part of impeller of FIG. 2 from the shroud ring side. It is a figure for demonstrating the handling method of the impeller of FIG. It is a figure which expands and shows the area | region where the impellers contact | abut in FIG. 4 from another direction. It is the top view which looked at some impellers of the modification from the shroud ring side. It is the top view which looked at a part of impeller of other modifications from the end wall side. It is a fragmentary perspective view of the impeller of FIG.

Explanation of symbols

10 end wall 16 outer peripheral part 18 blade 20 shroud ring 24 dent

Claims (3)

In an impeller of a centrifugal multiblade fan, which is formed integrally with both the outer peripheral portion of the end wall and the shroud ring, and has a plurality of blades arranged in the circumferential direction of the outer peripheral portion of the end wall and the shroud ring.
One end of the blade on the end wall side and the shroud ring are formed with a recess corresponding to the shape of the other, the impeller of the centrifugal multiblade blower.   The impeller of the centrifugal multiblade fan according to claim 1, wherein the end wall, the shroud ring, and the blade are made of a resin material. In the handling method of the impeller of the centrifugal multiblade fan according to claim 1 or 2,
One of the end portion of the blade on the end wall side and the shroud ring when the end portion of the blade on the end wall side in another impeller is brought into contact with the shroud ring of one impeller A method for handling an impeller of a centrifugal multiblade blower, wherein the other is fitted into a recess formed in the inner wall.

Images