JP4302587B2 - Multi-blade fan - Google Patents

Description

  The present invention relates to a multiblade fan, and more particularly to a multiblade fan suitable for a vehicle air conditioner or the like.

  Conventionally, as shown in FIGS. 11 to 14, a multiblade fan in which a large number of blades are arranged around a rotating shaft and air sucked from the axial direction of the rotating shaft is discharged in a radial direction. Known (for example, Patent Document 1). In the figure, 100 indicates the entire multiblade fan. The multi-blade fan 100 has a multi-blade fan section 102 having a large number of blades 101. A plurality of blades 101 are arranged around the rotation shaft 103. A disc-shaped drive plate 104 is provided at the end of the blade 101 on the side opposite to the air suction side, and is connected to all the blades 101. A boss portion 105 is formed at the center of the drive plate 104. A rotating shaft 103 is mounted in the boss portion 105, and the drive plate 104 and all the blades 101 are moved in the direction of the arrow in FIG. To be rotated. An annular connection ring 106 is provided at the air suction side end of the blade 101, and the connection ring 106 connects all the blades 101 to each other and plays a role of reinforcement.

  The multiblade fan 100 as described above is usually molded as an integrally molded product by injection molding or the like. Further, such a multiblade fan 100 is formed by a mold composed of an upper mold slidable in the arrow direction of FIGS. 12 and 14 and a lower mold. For example, as shown in FIGS. 12 and 14, a mold dividing surface (hereinafter also simply referred to as “PL”) between the mold and the lower mold is provided at the air suction side end of the blade 101. it can.

However, in the multiblade fan 100 as described above, as shown in FIGS. 13 and 14, the connecting portion 108 between the positive pressure surface 107 of the blade 101 and the peripheral edge 109 of the drive plate 104 is formed at an acute angle. When the multiblade fan 100 is rotated in the direction of the arrow in FIG. 11 as described above, a centrifugal force as shown in FIG. 13 acts and stress is concentrated on the connecting portion 108, and cracks or the like are generated in the connecting portion 108. May occur.
Japanese Patent No. 3028108

  SUMMARY OF THE INVENTION An object of the present invention is to provide a multiblade fan that reliably prevents the occurrence of cracks and the like in the connection portion between a blade and a drive plate, and has excellent durability.

  In order to solve the above problems, a multiblade fan according to the present invention is provided with a plurality of blades arranged in a circumferential direction around a rotating shaft, and connected to all blades provided at an end portion on the anti-air suction side of the blade. A disk-shaped drive plate and an annular connecting ring that connects the air suction side ends of the plurality of blades, and sucks air from the radially inner end side between the blades to the radially outer end side. In the centrifugal multiblade fan that discharges air, a gusset is provided at least at a connection portion that connects the positive pressure surface of the blade and the periphery of the drive plate. In such a configuration, since the gusset is provided at the connecting portion and the connecting portion is reinforced, the occurrence of cracks or the like is reliably prevented even when stress is concentrated on the connecting portion as the fan rotates.

  The gusset is preferably arranged such that the inner surface in the axial direction of the multiblade fan of the gusset is flush with the dividing surface of the mold for forming the multiblade fan. If it arrange | positions in this way, a gusset can be integrally shape | molded simultaneously at the time of shaping | molding of a multiblade ventilation fan, without providing a slide mechanism etc. to the metal mold | die for multiblade ventilation fans.

  In order to solve the above-mentioned problem, another multiblade fan according to the present invention is provided with a plurality of blades arranged in a circumferential direction around a rotation axis, and at an anti-air suction side end of the blade. A disk-shaped drive plate connected to all the blades and an annular connection ring connecting the air suction side ends of the plurality of blades, and sucks air from the radially inner end side between the blades. In the centrifugal multiblade fan that discharges air to the radially outer end side, the side surface of the connecting portion that connects the peripheral surface of the positive pressure surface of the blade and the drive plate is formed in a curved surface that is curved inward. Consists of. In such a configuration, since the side surface of the connecting portion that connects the positive pressure surface of the blade and the periphery of the drive plate is formed in a curved surface that is curved inward, the stress caused by the rotation of the fan at the connecting portion is a single point. Distributed without being concentrated. Therefore, concentration of stress is prevented, and generation of cracks and the like is reliably prevented.

  In order to solve the above-described problem, another multiblade fan according to the present invention includes a plurality of blades arranged in a circumferential direction around a rotation axis, and an anti-air suction side end portion of the blades. A disk-shaped drive plate connected to all the blades and an annular connection ring for connecting the air suction side ends of the plurality of blades, and air is supplied from the radially inner end side between the blades. In the centrifugal multiblade fan that sucks and discharges air to the radially outer end side, a gusset is provided at least on the connecting portion connecting the positive pressure surface of the blade and the peripheral edge of the drive plate, and at least on the side surface of the connecting portion It consists of what is characterized by forming a part in a curved surface. In such a configuration, the connecting portion is reinforced, and the stress accompanying the rotation of the fan is dispersed in the connecting portion without being concentrated at one point, so that the occurrence of cracks and the like can be prevented more reliably.

  According to the multiblade fan as described above, since the occurrence of cracks and the like in the connecting portion is reliably prevented, the durability of the multiblade fan can be greatly improved.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1 to 6 show a multiblade fan according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes the entire multiblade fan. The multiblade fan 1 has a multiblade fan section 3 having a large number of blades 2. A plurality of blades 2 are arranged around the rotating shaft 4. A disc-shaped drive plate 5 is provided at the end of the blade 2 on the side opposite to the air suction side, and is connected to all the blades 2. A boss portion 6 is formed at the center of the drive plate 5, and the rotary shaft 4 is mounted in the boss portion 6, and the drive plate 5 and all the blades 2 are moved in the direction of the arrow in FIG. To be rotated. An annular connection ring 7 is provided at the air suction side end of the blade 2, and the connection ring 7 connects all the blades 2 to each other and plays a role of reinforcement.

  Although not shown, a casing that houses the multi-blade fan unit 3 is provided around the multi-blade fan unit 3, and an air suction port and an air discharge port are formed in the casing. The casing can be formed in a scroll shape or a cylindrical shape.

  As shown in FIG. 4, each blade 2 is formed in a streamlined blade shape in which the blade front half 10 from the radially inner end 8 to the peripheral edge 9 of the drive plate decreases after the blade thickness once increases. The blade rear half 12 from the peripheral edge 9 of the drive plate of each blade 2 to the radially outer end 11 is formed in a plate shape having a substantially constant thickness.

  Further, as shown in FIGS. 5 and 6, a gusset 16 is provided at a connection portion 15 between the positive pressure surface 13 of each blade 2 and the peripheral edge 9 of the drive plate. In the present embodiment, the multiblade fan 1 is integrally formed by, for example, injection molding or the like. Further, the inner surface 17 in the axial direction of the multiblade fan of the gusset 16 is arranged so as to be flush with the dividing surface of the mold for forming the multiblade fan. Accordingly, the gusset 16 can be integrally formed at the same time as the multiblade fan 1 is formed without providing a slide mechanism or the like to the mold for forming the multiblade fan. Note that the multi-blade fan forming mold for forming the multi-blade fan 1 as described above can be composed of, for example, two movable molds slidable in the direction of the arrows in FIGS. 2, 3, and 5. Alternatively, one may be a fixed type and the other may be a movable type.

  In the multiblade fan 1 as described above, when the multiblade fan 1 is rotated in the direction of the arrow in FIG. 1, a centrifugal force as shown in FIG. In addition, cracks or the like may occur in the connection portion 15.

  However, in this embodiment, the gusset 16 is provided at the connection portion 15 between the positive pressure surface 13 of the blade 2 and the peripheral edge 9 of the drive plate, and the connection portion 15 is reinforced. Even if the stress is concentrated on 15, the occurrence of cracks or the like is reliably prevented.

  7 and 8 show a multiblade fan according to a second embodiment of the present invention. In this embodiment, the side surface 19 of the connecting portion 18 that connects the positive pressure surface 13 of the blade 2 and the peripheral edge 9 of the drive plate is formed as a curved surface that curves inward.

  In the present embodiment, the side surface 19 of the connecting portion 18 that connects the positive pressure surface 13 of the blade 2 and the peripheral edge 9 of the drive plate is formed in a curved surface curved inward, so that the multiblade fan 1 is shown in FIG. Even if it is rotated in the direction of the arrow, stress is not concentrated on the connecting portion 18 but is dispersed. Therefore, concentration of stress is prevented, and generation of cracks and the like is reliably prevented.

  FIG. 9 shows a multiblade fan according to a third embodiment of the present invention. In the present embodiment, a gusset 21 is provided at the connecting portion 20 between the positive pressure surface 13 of each blade 2 and the peripheral edge 9 of the drive plate, and the side surface 22 of the connecting portion 20 is formed in a curved surface curved inward. Yes. In other words, the embodiment is configured in a structure that combines the first embodiment and the second embodiment. Therefore, also in this embodiment, the occurrence of cracks and the like can be prevented more effectively in accordance with the operation of the first embodiment and the second embodiment, and the durability of the multiblade fan can be improved.

  FIG. 10 shows a multiblade fan according to a fourth embodiment of the present invention. In the present embodiment, a gusset 21 is provided at the connection portion 20 between the positive pressure surface 13 of each blade 2 and the peripheral edge 9 of the drive plate, and the side surfaces 22 of the connection portions 20 on both sides of the gusset 21 are curved inward. It is formed in a curved surface. Also in this embodiment, the occurrence of cracks and the like can be prevented more effectively in accordance with the operation of the first embodiment and the second embodiment, and the durability of the multiblade fan can be improved.

  The present invention can be suitably used for a centrifugal multiblade fan, particularly a multiblade fan used as a blower in an automotive air conditioner.

It is a front view of the multiblade ventilation fan which concerns on the 1st embodiment of this invention. It is a half section display side view of the multiblade ventilation fan of FIG. It is an enlarged view of the A section of the multiblade fan shown in FIG. It is sectional drawing which follows the IV-IV line of the multiblade ventilation fan of FIG. It is an expanded sectional view of the B section of the blade of FIG. It is a perspective view which shows the connection state of the braid | blade and drive plate of the multiblade ventilation fan of FIG. It is a perspective view which shows the connection state of the braid | blade and drive plate of a multiblade ventilation fan which concern on the 2nd embodiment of this invention. It is an expanded sectional view which shows the connection state of the braid | blade and drive plate of a multiblade ventilation fan which concern on the 2nd embodiment of this invention. It is a perspective view which shows the connection state of the braid | blade and drive plate of a multiblade ventilation fan which concern on the 3rd embodiment of this invention. It is a perspective view which shows the connection state of the braid | blade and drive plate of a multiblade ventilation fan which concern on the 4th embodiment of this invention. It is a front view of the conventional multiblade fan. It is a half section display side view of the multiblade ventilation fan of FIG. It is sectional drawing which follows the XII-XII line | wire of the multiblade ventilation fan of FIG. It is a perspective view which shows the connection state of the braid | blade and drive plate of the multiblade ventilation fan of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multiblade ventilation fan 2 Blade 3 Multiblade fan part 4 Rotating shaft 5 Drive plate 6 Boss part 7 Connection ring 8 Radial inner end 9 Periphery of drive plate 10 Blade front half 11 Radial outer end 12 Blade rear part 13 Pressure surface 14 Negative pressure surface 15, 18, 20 Connection portion 16, 21 Gusset 17 Inner surface 19, 22 Side surface

Claims (5)

  A plurality of blades arranged in the circumferential direction around the rotation axis, a disk-like drive plate provided at an end on the anti-air suction side of the blade and connected to all blades, and an air suction side of the plurality of blades A centrifugal multiblade blower fan that includes an annular connection ring that connects ends and sucks air from the radially inner end side between each blade and discharges air to the radially outer end side, at least the pressure surface of the blade A multi-blade blower fan, characterized in that a gusset is provided at a connecting portion that connects the peripheral edge of the drive plate.   2. The multiblade fan according to claim 1, wherein an inner surface in the axial direction of the multi-blade fan of the gusset is disposed flush with a mold dividing surface of a mold for molding a multiblade fan.   A plurality of blades arranged in the circumferential direction around the rotation axis, a disk-like drive plate provided at an end on the anti-air suction side of the blade and connected to all blades, and an air suction side of the plurality of blades A centrifugal multiblade blower fan that includes an annular connecting ring that connects the ends, and sucks air from the radially inner end side between each blade and discharges air to the radially outer end side; A multi-blade blower fan characterized in that a side surface of a connecting portion that connects a peripheral edge of a drive plate is formed into a curved surface.   A plurality of blades arranged in the circumferential direction around the rotation axis, a disk-like drive plate provided at an end on the anti-air suction side of the blade and connected to all blades, and an air suction side of the plurality of blades A centrifugal multiblade blower fan that includes an annular connection ring that connects ends and sucks air from the radially inner end side between each blade and discharges air to the radially outer end side, at least the pressure surface of the blade A multiblade blower fan, characterized in that a gusset is provided at a connection portion that connects the drive plate and the periphery of the drive plate, and at least a part of a side surface of the connection portion is formed into a curved surface. The multiblade fan according to any one of claims 1 to 4, wherein the multiblade fan is an integrally molded product.

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