WO1998053211A1 - Multi-blade centrifugal fan - Google Patents

Multi-blade centrifugal fan Download PDF

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Publication number
WO1998053211A1
WO1998053211A1 PCT/JP1998/002199 JP9802199W WO9853211A1 WO 1998053211 A1 WO1998053211 A1 WO 1998053211A1 JP 9802199 W JP9802199 W JP 9802199W WO 9853211 A1 WO9853211 A1 WO 9853211A1
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WO
WIPO (PCT)
Prior art keywords
centrifugal fan
blade
blades
air
flow path
Prior art date
Application number
PCT/JP1998/002199
Other languages
French (fr)
Japanese (ja)
Inventor
Masao Shiotani
Yuzuru Nakamura
Original Assignee
Toto Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toto Ltd. filed Critical Toto Ltd.
Priority to JP55022898A priority Critical patent/JP4269092B2/en
Publication of WO1998053211A1 publication Critical patent/WO1998053211A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis

Definitions

  • the present invention relates to a multi-blade centrifugal fan, and more particularly to an improved blade structure for increasing wind power.
  • Multi-blade centrifugal fans basically consist of a number of blades (blades) arranged in a ring on a rotating substrate. When this is rotated, outside air is sucked into the inner peripheral side of the annular cascade from the opening on the tip side in the axial direction, and the sucked air is blown out of the cascade through the gap between the blades by centrifugal force.
  • One problem with the multi-blade centrifugal fan that works on such a basic principle is the relationship between the air flow that blows from the tip of the fan to the outer circumference, and the efficiency on the suction side of the fan, that is, the portion near the tip, is compared. The point is that it becomes lower.
  • a multi-blade fan disclosed in Japanese Patent Application Laid-Open No. 7-233798 is equipped with an annular auxiliary wing on the tip side of an annular main cascade on a rotating substrate.
  • the main cascade and the auxiliary cascade are separated from each other by a cylindrical body that curves obliquely concavely from the inner peripheral tip of the auxiliary cascade to the outer peripheral base end.
  • a bell mouth is attached to guide the outside air to the inner peripheral side of the main cascade and to the front end of the auxiliary wing.
  • the multi-blade blower disclosed in Japanese Patent Application Laid-Open No. It replaces the low-efficiency front-end part of the basic structure of a multi-blade centrifugal fan with a mixed-flow fan that draws in air from the front end and diagonally outwards.
  • a mixed flow fan is not very high in principle, so that a remarkable increase in airflow cannot be expected.
  • an object of the present invention is to provide an improved multi-blade centrifugal fan capable of obtaining a larger air flow than the technology. Disclosure of the invention
  • a multi-blade centrifugal fan includes: a first centrifugal fan having a relatively small inner peripheral diameter having a plurality of first blade plates arranged on a rotating board; A second centrifugal fan having a relatively large inner peripheral diameter and having a plurality of second blades arranged on the tip side of the centrifugal fan.
  • a multi-blade centrifugal fan includes a plurality of centrifugal fans having different inner peripheral diameters, and a centrifugal fan having a relatively large inner peripheral diameter is provided at a distal end side of the centrifugal fan having a relatively small internal peripheral diameter. Fans are located.
  • a multi-blade centrifugal fan includes a plurality of first blade plates arranged on a rotating substrate and having a relatively large width in a radial direction, and a tip of a row of the first blade plates. And a plurality of second vanes having a relatively narrow width in the radial direction arranged near the outer periphery on the side.
  • a multi-blade centrifugal fan includes a plurality of blades arranged on a rotating board, wherein each blade has a first portion having a relatively large width in a radial direction. And a second portion having a relatively narrow width in the radial direction, which is disposed near the outer periphery on the distal end side of the first portion.
  • a multi-blade centrifugal fan includes a plurality of blades arranged in a ring on a rotating substrate, and each blade has a relatively small inner peripheral diameter. It has a first portion arranged, and a second portion arranged on the distal end side of the first portion and arranged with a relatively large inner peripheral diameter.
  • a multi-blade centrifugal fan includes a plurality of blades arranged on a rotating board, and the shape of the inner peripheral surface of the row of the blades is changed from a base end to a tip end.
  • the shape is such that the diameter gradually increases toward it.
  • the row of the first blades functions as a centrifugal fan having a small inner peripheral diameter
  • the second blade arranged at the tip end thereof has The row of vanes functions as a centrifugal fan with a large inner diameter (second centrifugal fan).
  • the multi-blade centrifugal fan of the present invention has a structure in which another centrifugal fan having a larger inner peripheral diameter is arranged on the tip side of a centrifugal fan having a certain inner peripheral diameter. be able to.
  • a centrifugal fan with a large inner diameter produces a large air flow instead of the tip portion, which had a small air flow in the basic structure of the conventional multi-blade centrifugal fan described above. Blower volume increases.
  • the centrifugal fan with a large inner peripheral diameter at the front end has a larger air flow rate because it is a centrifugal fan than the mixed flow fan at the front end of JP-A-7-233798. Can be born.
  • the distal end surface of the centrifugal fan having a small inner peripheral diameter on the proximal end is directed from the inner peripheral side to the outer peripheral side with respect to the rotating shaft and is directed from the distal end side to the proximal end side.
  • a large-diameter centrifugal fan blade is disposed near the outer periphery on the inclined front end surface.
  • a particularly inefficient portion of the centrifugal fan on the proximal end is cut off, so that the cut surface forms an inclined distal end surface. It plays a role in smoothing the airflow entering the centrifugal fan. Therefore, the effect of increasing the air volume is further enhanced Good.
  • FIG. 1 is a plan view of a multi-blade centrifugal fan according to an embodiment of the present invention, as viewed from a distal end side having an air suction port.
  • Fig. 2 is a cross-sectional view of the fan taken along the line A-A in Fig. 1.
  • FIG. 3 is a sectional view of a multi-blade centrifugal fan according to a second embodiment of the present invention.
  • FIG. 4 is a sectional view of a multi-blade centrifugal fan according to a third embodiment of the present invention.
  • FIG. 5 is a sectional view of a multi-blade centrifugal fan according to a fourth embodiment of the present invention.
  • FIG. 6 is a sectional view of a multi-blade centrifugal fan according to a fifth embodiment of the present invention.
  • FIG. 5 is a sectional view of a multi-blade centrifugal fan according to a sixth embodiment of the present invention.
  • FIG. 8 is a sectional view of a multi-blade centrifugal fan according to a seventh embodiment of the present invention.
  • FIG. 9 is a sectional view of a multi-blade centrifugal fan according to an eighth embodiment of the present invention.
  • FIG. 10 is a sectional view of a multi-blade centrifugal fan according to a ninth embodiment of the present invention.
  • FIG. 11 is a sectional view of a multi-blade centrifugal fan according to a tenth embodiment of the present invention.
  • FIG. 12 is a cross-sectional view of the multi-blade centrifugal fan according to the first embodiment of the present invention.
  • FIG. 13 is a plan view of the multiblade centrifugal fan according to the first or second embodiment of the present invention, as viewed from the tip side.
  • Fig. 14 is a cross-sectional view of the fan taken along the line D-D in Fig. 13.
  • FIG. 15 is a diagram showing performance test results of the first and second embodiments in comparison with those of the conventional basic structure.
  • FIG. 16 shows the multi-blade centrifugal fan of the present invention shown in Figs. 1 and 2 (where all the first blades 3 have the same width), the conventional sirocco fan and the conventional radial alpha.
  • FIG. 6 is a diagram showing test results of performance at 200 rpm—constant rotation speed for three types of fans.
  • Fig. 17 shows the test results of Fig. 16 by normalizing the air flow Q, the static pressure P s on the vertical axis and the noise level LA to the flow coefficient, pressure coefficient and specific noise, respectively.
  • Fig. 19 shows the total pressure efficiency of the five types of fans shown in Figs. 1 and 2, the conventional fan, the conventional radial fan, the conventional multi-layer disc fan, the conventional sirocco fan, and the conventional turbo fan. The figure which showed the test result of.
  • FIG. 20 is a cross-sectional view of one embodiment of a blower using the fan of the present invention. Best mode for carrying out the invention
  • FIG. 1 is a plan view of a multi-blade centrifugal fan according to an embodiment of the present invention as viewed from the front end side having an air intake port.
  • FIG. 2 is a cross-sectional view of the fan taken along line AA in FIG. You.
  • the “tip side” refers to the side of the air intake port of the multi-blade centrifugal fan
  • the “proximal side” refers to the side of the rotating board 1.
  • first blade plates 3 are erected on a rotating substrate 1 having a circular planar shape in parallel with the rotation axis C. These multiple first blade plates 3 are arranged at a constant pitch along the outer peripheral edge of the rotating substrate 1 in an annular shape around the rotation axis C.
  • the outer peripheral base ends of the annular rows of the first blade plates 3 are connected by a reinforcing ring 4.
  • the annular row of the first blades 3 functions as a “first centrifugal fan”.
  • the annular row of the first blades 3 shows the air flow indicated by the arrow W1 in FIG.
  • outside air is sucked into the inner circumferential space 5 from the front end side opening 7 and acts to blow out the sucked air to the outer circumferential side through the gap between the blade plates 3.
  • the center of the substrate 1, which forms the bottom surface of the inner peripheral space 5 is slightly lifted to the tip end, and It forms a moderate slope from to the surroundings.
  • two types of blades 3L having different widths that is, having different amounts of protrusion to the inner peripheral side
  • the first blade plate 3 has a forward wing whose inner and outer ends are curved so as to form an acute angle with respect to the rotation direction B. It has become a multi-winged "Shiroi Fan". However, it is not always necessary to have such a structure. For example, all of the first blade plates 3 may have the same width (that is, the same amount of protrusion toward the inner peripheral side).
  • the blade 3 may be a flat plate to form a “radial fan”, or the first blade 3 may be a swept wing to form a “turbo fan”.
  • the first blade plate 3 moves a portion of the blade plate 3, which was originally substantially rectangular, on the outer periphery of the distal end from the inner peripheral side to the outer peripheral side from the distal end side to the proximal end side.
  • it has a shape as if it were cut along a line inclined with respect to the rotation axis C. That is, the tip surface of the first blade plate 3 has the inclined surface as described above.
  • An annular air guide plate 9 is joined to the inclined front end surface, and a large number (for example, about 100) of second blade plates 11 are placed on the surface near the outer periphery of the air guide plate 9. Are erected in parallel to the rotation axis C and arranged in an annular shape.
  • the width of these second blades 11 along the radial direction is clearly smaller than that of the first blades 3. Therefore, the annular row of the second blades 11 has a larger inner peripheral diameter than the annular row of the first blades 3, and the inner peripheral side of the first blade 3 A space 13 is formed between the inclined tip surface.
  • the annular row of the second blades 11 functions as a “second centrifugal fan”. That is, when the substrate 1 is rotated, the annular row of the second blades 11 is opened into its inner peripheral space 13 as shown by the arrow W2 in FIG. External air is sucked in from 15 and acts to blow out the sucked air to the outer peripheral side through the gap between the blades 11.
  • the height of the tip 11 a of the second blade 11 is set to the inner tip of the first blade 3. It is slightly higher than the part 3a (that is, it protrudes to the tip side from the first blade 3).
  • the air guide plate 9 forming the bottom surface of the inner peripheral space 13 is As shown in FIG. 2, it is inclined with respect to the rotation axis C and is appropriately curved in a concave arc shape.
  • the second blade 11 is curved like the first blade 3, but it is not always necessary, and the shape and the number of the second blade 11 are different from those of the first blade 3 (for example, FIGS. 13 and 14). Embodiment shown in FIG.
  • the outer periphery of the tip end of the second blade plate 11 is connected by a reinforcing ring 17.
  • the inner / outer diameter ratio (inner diameter / outer diameter) of the annular row of the first blades 3 is, for example, about 60% to 65%
  • the inner / outer diameter ratio of the annular row of the second blades 11 is, for example, 85%. % To about 90%, but it is not necessary to be so, and other values may be used.
  • the multi-blade centrifugal fan having the above configuration can be integrally manufactured by, for example, injection molding using synthetic resin, but it is needless to say that it can be manufactured by other materials such as metal and other methods. .
  • the annular row of the first blades 3 and the annular row of the second blades 11 each function as a “centrifugal fan” as described above.
  • the annular row of the first blades 3 draws outside air into the inner circumferential space 5 from the front-end opening 7, and flows the sucked air toward the outer circumference through the gap between the blades 3. Blow out.
  • the annular row of the second blades 11 sucks outside air into the inner peripheral space 13 from the opening 15 on the tip side, and passes the intake air through the gap between the blades 11. Blow out to the outer side.
  • the place where the centrifugal fan action of the second blade plate 11 mainly works is a portion of the first blade plate 3 on the outer peripheral side of the tip as if it were cut off.
  • this portion has been conventionally regarded as a problem in that the efficiency is relatively low and the air flow rate is small. Part.
  • this problematic part of the “first centrifugal fan” by the first blade plate 3 is cut away, and the “second centrifugal fan” by the second blade plate 11 having the inner circumferential space 13 is removed.
  • the air guide plate 9 forming the bottom surface of the “second centrifugal fan” facilitates the flow of the air drawn into the inner peripheral space 13 to the second blade plate 11 by its inclination and curvature. .
  • the air volume in this problem part is improved, and thus the overall air volume is increased.
  • This effect of increasing the air volume is greater than that using the mixed flow fan as described in the section of the prior art.
  • a large air flow has the advantage of requiring a smaller size to obtain the same air flow.
  • the present invention is not limited to the above-described embodiment, but can be implemented in other various forms. Some representative embodiments are illustrated below, and differences from the embodiments shown in FIGS. 1 and 2 will be described.
  • the height of the tip 3a on the inner circumferential side of the first blade plate 3 is the same as the height of the tip 11a of the second blade plate 11. It is.
  • the tip 3a on the inner circumferential side of the first blade plate 3 is slightly higher than the tip 11a of the second blade plate 11.
  • the heights of the tip portions of the first blade plate 3 and the second blade plate 11 may be the same or slightly different. However, as in the embodiment shown in FIG. When the height of the tip 3 is slightly lower than that of the second blade 11, a more preferable air volume increasing effect can be obtained.
  • the air guide plate 9 (that is, the inclined front end face of the first blade plate) is not curved but linearly inclined.
  • the multi-blade centrifugal fan shown in the sectional view of FIG. 6 has no baffle plate 9 and each first blade plate 3 and each second blade plate 11 are formed as one blade plate. It is.
  • the air guide plate 9 is formed only at the bottom of the inner peripheral space 13 of the second blade plate 11, and the first blade plate 3 and the second The blade 11 is formed as one blade.
  • the air guide plate 9 is formed only at the base end of the second blade plate 11, and the bottom of the inner peripheral space 13 of the second blade plate 11 is formed. Has no baffle plate 9.
  • the air guide plate 9 covers the entire front end surface of the first blade plate 3.
  • the multi-blade centrifugal fan shown in the cross-sectional view of FIG. 10 has a plurality of annular rectifying plates 19 mounted on the outer periphery of the blades 3 and 11 (or one annular rectifying plate 19 is formed in a spiral shape). (Wrapped multiple times).
  • the annular baffle 19 reduces the density of the airflow blown out between the blades 3 and 11, thereby contributing to an increase in air volume and a reduction in noise.
  • the annular current plate 19 is thin and has a narrow width in the radial direction.
  • the cross-sectional shape may be square, triangular, or any other suitable polygon or streamline. Various things can be adopted.
  • the outer peripheral edge of the rotating board 1 extends to the outer peripheral edge of the annular row of the first blades 3, and the base end face 3 of the annular row of the first blades 3. a is completely closed.
  • the base end face of the annular row of the blades 3 is open, the wind can be blown out from the base end face, so that a larger air volume can be obtained.
  • the inner peripheral edge of the reinforcing ring 17 extends to the inner peripheral edge of the annular row of the second blades, and the tip surface of the annular row of the second blades 1 la Is completely obstructed.
  • FIG. 13 is a plan view of a multi-blade centrifugal fan according to still another embodiment as viewed from the front end side
  • FIG. 14 is a cross-sectional view along the line DD.
  • the main feature of this multi-blade centrifugal fan is that the outer diameter of the annular row of the second blades 11 is larger than the outer diameter of the annular row of the first blades 3. Accordingly, the inner peripheral diameter of the annular row of the second blade plate 11 is also larger than that shown in FIGS. 1 to 12, for example, as shown in the drawing, substantially equal to the outer diameter of the first blade plate 3. It is designed to have the same diameter. Therefore, most of the second blade plate 11 protrudes toward the outer peripheral side of the first blade plate 3.
  • the shape and number of the second blades 11 are also designed independently of those of the first blades 3, for example, as shown, the number of the second blades 11 is about 60 And constitutes a “multi-blade sirocco fan” (however, this need not be the case; it may constitute a “radial fan” or a “turbo fan”, and the number of blades may be the same as that of the first blade 3). It may be the same).
  • the base end surface of the portion of the second blade plate 11 that protrudes outward from the first blade plate 3 is covered with the baffle plate 9 as shown in the figure, but is not covered with the baffle plate 9. (In this case, it is desirable to connect the outer periphery of the base end of the second blade 11 with an additional reinforcing ring in order to obtain sufficient strength).
  • the inner space 13 of the “second centrifugal fan” formed by the second blade plate 11 is wide and the outer diameter is large. The increasing effect is even higher.
  • Fig. 15 is a P-Q diagram showing the performance test results of the multi-blade centrifugal fan shown in Figs. 13 and 14 and the conventional multi-blade centrifugal fan with the basic structure (air volume Q on the horizontal axis, static on the vertical axis). Pressure Ps).
  • the two types of fans tested had substantially the same external size.
  • the sample points associated with the straight lines indicate the operating points of the two types of fans having the same rotational speed, and the rotational speeds (rpm) at that time are described beside each sample point.
  • the embodiment of the present invention can provide a higher static pressure range and supply a larger air volume at the same rotation speed as compared with the conventional basic structure.
  • FIGS. 16 and 17 show the multi-blade centrifugal fan of the present invention shown in FIGS. 1 and 2 (however, all the first blades 3 have the same width), the conventional sirocco fan and the conventional radial fan.
  • the results of performance tests at 2000 rpm—constant rotation speed for each type of fan are shown.
  • the horizontal axis represents the airflow Q
  • the vertical axis represents the static pressure Ps and the noise level LA.
  • the air volume Q, the static pressure P s on the vertical axis, and the noise level LA in Fig. 16 are normalized to a flow coefficient, a pressure coefficient, and a specific noise, respectively.
  • the results of the performance test at a conventional sirocco fan at 2280 rpm are shown.
  • the horizontal axis shows the airflow Q
  • the vertical axis shows the static pressure Ps and the noise level LA.
  • the three fans tested had the same external dimensions of 125 mm outside diameter and 55 mm length.
  • the fan of the present invention had 100 curved first blades, had an inner diameter of 92 mm, and had 120 curved second blades, and had an inner diameter of 110 mm.
  • Conventional radial fans have 120 straight blades, Its internal diameter was 95 mm.
  • a conventional sirocco fan had 100 curved blades and an inner diameter of 95 mm.
  • the fan of the present invention has much better P-Q characteristics and quietness than the conventional radial and sirocco fans having the same external size.
  • Fig. 19 shows the total pressure of the five types of fans shown in Figs. 1 and 2, the conventional radial fan, the conventional multilayer disc fan, the conventional sirocco fan, and the conventional evening fan. The efficiency test results are shown. The five fans tested had substantially the same external size.
  • FIG. 20 shows a schematic cross-sectional structure of one embodiment of a blower using the multi-blade fan of the present invention.
  • the blower 100 shown in FIG. 20 is used in, for example, a bathroom clothes dryer, an air conditioner, a ventilation device such as a bathroom, a kitchen or a toilet, a combustion device such as a water heater, a hand dryer, an air curtain device, and the like. Suitable for blower and air supply / exhaust device.
  • the blower 100 can also be used as a blower in a refrigerator, a heating device, an electronic device such as a copying machine or a computer, and a local cleaning device for a toilet.
  • the blower 100 has an outer case 101 having an air inlet 109 and an air outlet 111.
  • a multi-blade fan 107 of the present invention housed in a fan case 105 is arranged in an air flow passage 113 extending from an air inlet 111 to an air outlet 111 in the outer case 101.
  • air conditioners 103 such as heaters, coolers or heat exchangers, for heating, cooling or drying the air, etc., should also be provided in the air passage 113. Be killed.
  • the air conditioner 103 is shown near the air inlet 109 or by a dotted line. It can be located at the air outlet 103 as well as at any other suitable location. As indicated by the arrow, when the fan 107 of the present invention rotates, outside air enters the blower 100 from the air inlet 109 and blows out from the air outlet 103.
  • the multi-blade fan of the present invention can also be configured by partially combining the components of some of the embodiments described above.
  • it can be applied not only to sirocco fans but also to various types of fans such as radial fans and Yuichibo fans.
  • each of the above-described embodiments is constituted by a two-stage centrifugal fan having large and small inner diameters.
  • the principle of the present invention is not limited to these two structures but also to a structure having three or more stages; You can also.

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Abstract

The problem of a low efficiency of a free end portion of a multi-blade centrifugal fan is solved, and a general air supply volume is thereby increased. A plurality of first blades (3) are arranged annularly on a rotary base (1). A row of first blades (3) have free end surfaces which are inclined with respect the axis (C) of rotation as if the outer circumferential end portions of the blades are cut off, and an annular baffle plate (9) is joined to the inclined free end surfaces. A plurality of second blades (11) are arranged annularly on the baffle plate (9). The width of each second blade (11) is apparently smaller than that of the first blade (3), so that clearances (13) exist between the inner circumferential portions of the second blades (11) and the free end surfaces of the first blades (11). A row of second blades (11) function as a centrifugal fan sucking the air from free end openings (15) into the inner circumferential clearances (13) and blowing out the air to the outer circumferential side thereof. The baffle plate (9) may not be provided. A plurality of annular current distributing plates (19) may be fixed to the outer circumferential portions of the blades (3, 11).

Description

明 細 書 多翼遠心ファン 技 術 分 野  Description Multi-blade centrifugal fan technology field
本発明は、 多翼遠心フアンに関わり、 特に風力増大のための翼構造の改良に関す る。 技 術 背 景  The present invention relates to a multi-blade centrifugal fan, and more particularly to an improved blade structure for increasing wind power. Technology background
多翼遠心ファンは、 基本的に、 回転基板上に多数の羽根板 （翼） を円環状 に配列したものである。 これを回転させると、 軸方向先端側の開口から円環 状翼列の内周側へ外気を吸込み、 吸込んだ空気を遠心力により翼間の隙間を 通して翼列の外方へ吹出す。 このような基本原理で働く多翼遠心ファンの一 つの問題は、 ファンの先端側から吸込み外周側へ吹出すという空気の流れの 関係で、 ファンの吸込み側つまり先端に近い部分での効率が比較的に低くな つてしまう点である。  Multi-blade centrifugal fans basically consist of a number of blades (blades) arranged in a ring on a rotating substrate. When this is rotated, outside air is sucked into the inner peripheral side of the annular cascade from the opening on the tip side in the axial direction, and the sucked air is blown out of the cascade through the gap between the blades by centrifugal force. One problem with the multi-blade centrifugal fan that works on such a basic principle is the relationship between the air flow that blows from the tip of the fan to the outer circumference, and the efficiency on the suction side of the fan, that is, the portion near the tip, is compared. The point is that it becomes lower.
この問題を解決するため、 特開昭 7— 2 3 3 7 9 8号に開示された多翼送 風機は、 回転基板上の円環状の主翼列の先端側に、 同様に円環状の補助翼の 列を備えており、 主翼列と補助翼列との間は、 補助翼列の内周側先端から外 周側基端へ向かって斜めに凹弧面状に湾曲した円筒体によって仕切られてい る。 そして、 補助翼列の先端側には、 外気を主翼列の内周側及び補助翼の先 端側にそれそれ吸込むよう案内するためのベルマウスが取付けられている。 この多翼送風機を回転させると、 補助翼列は、 空気を翼列の先端から吸込ん で斜め外方へ流す斜流フアンとして機能する。  In order to solve this problem, a multi-blade fan disclosed in Japanese Patent Application Laid-Open No. 7-233798 is equipped with an annular auxiliary wing on the tip side of an annular main cascade on a rotating substrate. The main cascade and the auxiliary cascade are separated from each other by a cylindrical body that curves obliquely concavely from the inner peripheral tip of the auxiliary cascade to the outer peripheral base end. You. At the front end of the auxiliary cascade, a bell mouth is attached to guide the outside air to the inner peripheral side of the main cascade and to the front end of the auxiliary wing. When this multi-blade blower is rotated, the auxiliary cascade functions as a diagonal fan that draws air from the tip of the cascade and flows obliquely outward.
特開昭 7— 2 3 3 7 9 8号に開示された多翼送風機は、 要するに、 上述し た多翼遠心ファンの基本構造における低効率な先端側部分を、 空気を先端か ら吸込み斜め外方へ出すという斜流ファンに置き換えたものである。しかし、 斜流ファンの性能は、 その原理上あまり高いものではないから、 際立った送 風量増大効果は期待できない。 The multi-blade blower disclosed in Japanese Patent Application Laid-Open No. It replaces the low-efficiency front-end part of the basic structure of a multi-blade centrifugal fan with a mixed-flow fan that draws in air from the front end and diagonally outwards. However, the performance of a mixed flow fan is not very high in principle, so that a remarkable increase in airflow cannot be expected.
従って、 本発明の目的は、 技術よりも大きい送風量が得られる改良された多 翼遠心ファンを することにある。 発 明 の 開 示  Accordingly, an object of the present invention is to provide an improved multi-blade centrifugal fan capable of obtaining a larger air flow than the technology. Disclosure of the invention
本発明の第 1の側面に従う多翼遠心ファンは、 回転基板上に配列された複 数枚の第 1の羽根板を有する比較的小さい内周径をもつ第 1の遠心ファンと、 第 1の遠心ファンの先端側に配列された複数枚の第 2の羽根板を有する比較 的大きい内周径をもつ第 2の遠心ファンとを備える。  A multi-blade centrifugal fan according to a first aspect of the present invention includes: a first centrifugal fan having a relatively small inner peripheral diameter having a plurality of first blade plates arranged on a rotating board; A second centrifugal fan having a relatively large inner peripheral diameter and having a plurality of second blades arranged on the tip side of the centrifugal fan.
本発明の第 2の側面に従う多翼遠心ファンは、 異なる内周径をもつ複数の 遠心ファンを備え、 比較的小さい内周径をもつ遠心ファンの先端側に比較的 大きい内周径をもつ遠心ファンが配置されている。  A multi-blade centrifugal fan according to a second aspect of the present invention includes a plurality of centrifugal fans having different inner peripheral diameters, and a centrifugal fan having a relatively large inner peripheral diameter is provided at a distal end side of the centrifugal fan having a relatively small internal peripheral diameter. Fans are located.
本発明の第 3の側面に従う多翼遠心ファンは、 回転基板上に配列された径 方向に比較的に広い幅をもつ複数枚の第 1の羽根板と、 第 1の羽根板の列の 先端側の外周寄りに配列された径方向に比較的に狭い幅をもつ複数枚の第 2 の羽根板とを備える。  A multi-blade centrifugal fan according to a third aspect of the present invention includes a plurality of first blade plates arranged on a rotating substrate and having a relatively large width in a radial direction, and a tip of a row of the first blade plates. And a plurality of second vanes having a relatively narrow width in the radial direction arranged near the outer periphery on the side.
本発明の第 4の側面に従う多翼遠心ファンは、 回転基板上に配列された複 数枚の羽根板を備え、 各羽根板が、 径方向に比較的に広い幅をもつ第 1の部 分と、 この第 1の部分の先端側外周寄りに配置された径方向に比較的に狭い 幅をもつ第 2の部分とを有する。  A multi-blade centrifugal fan according to a fourth aspect of the present invention includes a plurality of blades arranged on a rotating board, wherein each blade has a first portion having a relatively large width in a radial direction. And a second portion having a relatively narrow width in the radial direction, which is disposed near the outer periphery on the distal end side of the first portion.
本発明の第 5の側面に従う多翼遠心ファンは、 回転基板上に円環状に配列 された複数枚の羽根板を備え、 各羽根板が、 比較的に小さい内周径をもって 配列された第 1の部分と、 この第 1の部分の先端側に配置され比較的に大き い内周径をもって配列された第 2の部分とを有する。 A multi-blade centrifugal fan according to a fifth aspect of the present invention includes a plurality of blades arranged in a ring on a rotating substrate, and each blade has a relatively small inner peripheral diameter. It has a first portion arranged, and a second portion arranged on the distal end side of the first portion and arranged with a relatively large inner peripheral diameter.
本発明の第 6の側面に従う多翼遠心フアンは、 回転基板上に配列された複 数枚の羽根板を備え、 それら羽根板の列の内周面の形状が、 基端側から先端 側に向かって段階的に径が拡大するような形状である。  A multi-blade centrifugal fan according to a sixth aspect of the present invention includes a plurality of blades arranged on a rotating board, and the shape of the inner peripheral surface of the row of the blades is changed from a base end to a tip end. The shape is such that the diameter gradually increases toward it.
以上の本発明に従う多翼遠心ファンでは、 第 1の羽根板 （又は、 羽根板の 第 1の部分） の列が内周径の小さい遠心ファンとして機能し、 その先端側に 配置された第 2の羽根板の列が内周径の大きい遠心フアン （第 2の遠心ファ ン） として機能する。 つまり、 本発明の多翼遠心ファンは、 ある内周径をも つた遠心ファンの先端側に、 より大きい内周径をもった別の遠心ファンが配 置された構造をもったものと説明することができる。 或は、 一つの遠心ファ ンの内周径が、 基端側から先端側に向って段階的に拡大していく構造をもつ たものと説明することもできる。  In the above multi-blade centrifugal fan according to the present invention, the row of the first blades (or the first portion of the blades) functions as a centrifugal fan having a small inner peripheral diameter, and the second blade arranged at the tip end thereof has The row of vanes functions as a centrifugal fan with a large inner diameter (second centrifugal fan). In other words, the multi-blade centrifugal fan of the present invention has a structure in which another centrifugal fan having a larger inner peripheral diameter is arranged on the tip side of a centrifugal fan having a certain inner peripheral diameter. be able to. Alternatively, it can be described as having a structure in which the inner diameter of one centrifugal fan gradually increases from the base end toward the tip end.
このような構造によれば、 前述した従来の多翼遠心ファンの基本的構造で は送風量の小さかった先端部分に代って、 大内周径の遠心ファンが大きい送 風量を生むため、 全体の送風量が増大する。 また、 この先端側の大内周径の 遠心ファンは、 特開昭 7— 2 3 3 7 9 8号の先端側の斜流ファンと比較して も、 遠心ファンであるが故により大きい送風量を生むことができる。  According to such a structure, a centrifugal fan with a large inner diameter produces a large air flow instead of the tip portion, which had a small air flow in the basic structure of the conventional multi-blade centrifugal fan described above. Blower volume increases. In addition, the centrifugal fan with a large inner peripheral diameter at the front end has a larger air flow rate because it is a centrifugal fan than the mixed flow fan at the front end of JP-A-7-233798. Can be born.
本発明の多翼心ファンでは、 望ましくは、 基端側の小内周径の遠心ファン の先端面が、 回転軸に対し内周側から外周側へ向かつて先端側から基端側へ と向かうよう傾斜した面を有していて、 この傾斜した先端面上の外周寄りに 大内径の遠心ファンの羽根板が配置される。 この構造では、 基端側の遠心フ アンの特に効率の悪い部分が切除されて、 その切除面が傾斜した先端面をな していることになり、 かつ、 この傾斜した先端面が、 先端側の遠心ファンへ 入る空気流をスムーズにする役割を果たす。 よって、 風量増大の効果が一層 良好である。 In the multi-blade core fan of the present invention, preferably, the distal end surface of the centrifugal fan having a small inner peripheral diameter on the proximal end is directed from the inner peripheral side to the outer peripheral side with respect to the rotating shaft and is directed from the distal end side to the proximal end side. A large-diameter centrifugal fan blade is disposed near the outer periphery on the inclined front end surface. In this structure, a particularly inefficient portion of the centrifugal fan on the proximal end is cut off, so that the cut surface forms an inclined distal end surface. It plays a role in smoothing the airflow entering the centrifugal fan. Therefore, the effect of increasing the air volume is further enhanced Good.
さらに、 この傾斜した先端面に導 at反を接合すると、 先端側の遠  In addition, when the guide at is joined to this inclined tip surface,
空気流が一層スムーズになる。 図面の簡単な説明 The air flow becomes smoother. BRIEF DESCRIPTION OF THE FIGURES
図 1は、 本発明の一実施形態にかかる多翼遠心フアンを空気吸入口のある 先端側から見た平面図。  FIG. 1 is a plan view of a multi-blade centrifugal fan according to an embodiment of the present invention, as viewed from a distal end side having an air suction port.
図 2は、 図 1の A— A線に沿った同ファンの断面図。  Fig. 2 is a cross-sectional view of the fan taken along the line A-A in Fig. 1.
図 3は、 本発明の第 2の実施形態にかかる多翼遠心ファンの断面図。  FIG. 3 is a sectional view of a multi-blade centrifugal fan according to a second embodiment of the present invention.
図 4は、 本発明の第 3の実施形態にかかる多翼遠心ファンの断面図。  FIG. 4 is a sectional view of a multi-blade centrifugal fan according to a third embodiment of the present invention.
図 5は、 本発明の第 4の実施形態にかかる多翼遠心ファンの断面図。  FIG. 5 is a sectional view of a multi-blade centrifugal fan according to a fourth embodiment of the present invention.
図 6は、 本発明の第 5の実施形態にかかる多翼遠心ファンの断面図。  FIG. 6 is a sectional view of a multi-blade centrifugal fan according to a fifth embodiment of the present invention.
図 Ίは、 本発明の第 6の実施形態にかかる多翼遠心ファンの断面図。  FIG. 5 is a sectional view of a multi-blade centrifugal fan according to a sixth embodiment of the present invention.
図 8は、 本発明の第 7の実施形態にかかる多翼遠心ファンの断面図。  FIG. 8 is a sectional view of a multi-blade centrifugal fan according to a seventh embodiment of the present invention.
図 9は、 本発明の第 8の実施形態にかかる多翼遠心ファンの断面図。  FIG. 9 is a sectional view of a multi-blade centrifugal fan according to an eighth embodiment of the present invention.
図 1 0は、 本発明の第 9の実施形態にかかる多翼遠心ファンの断面図。 図 1 1は、 本発明の第 1 0の実施形態にかかる多翼遠心ファンの断面図。 図 1 2は、 本発明の第 1 1の実施形態にかかる多翼遠心ファンの断面図。 図 1 3は、 本発明の第 1 2の実施形態にかかる多翼遠心ファンを先端側か ら見た平面図。  FIG. 10 is a sectional view of a multi-blade centrifugal fan according to a ninth embodiment of the present invention. FIG. 11 is a sectional view of a multi-blade centrifugal fan according to a tenth embodiment of the present invention. FIG. 12 is a cross-sectional view of the multi-blade centrifugal fan according to the first embodiment of the present invention. FIG. 13 is a plan view of the multiblade centrifugal fan according to the first or second embodiment of the present invention, as viewed from the tip side.
図 1 4は、 図 1 3の D— D線に沿った同ファンの断面図。  Fig. 14 is a cross-sectional view of the fan taken along the line D-D in Fig. 13.
図 1 5は、 第 1 2の実施形態の性能の試験結果を従来の基本構造のそれと 比較して示した図。  FIG. 15 is a diagram showing performance test results of the first and second embodiments in comparison with those of the conventional basic structure.
図 1 6は、 図 1、 2に示した本発明の多翼遠心ファン （但し、 全ての第 1 の羽根板 3が同じ幅をもつ）、 従来のシロッコファン及び従来のラジアルファ ンの 3種類のファンについて、 2 0 0 0 r p m—定の回転数における性能の 試験結果を示した図。 Fig. 16 shows the multi-blade centrifugal fan of the present invention shown in Figs. 1 and 2 (where all the first blades 3 have the same width), the conventional sirocco fan and the conventional radial alpha. FIG. 6 is a diagram showing test results of performance at 200 rpm—constant rotation speed for three types of fans.
図 1 7は、 風量 Q、 縦軸の静圧 P s及び騒音レベル LA を流量係数、 圧量 係数、 比騒音にそれそれ正規化して図 1 6の試験結果を示した図。  Fig. 17 shows the test results of Fig. 16 by normalizing the air flow Q, the static pressure P s on the vertical axis and the noise level LA to the flow coefficient, pressure coefficient and specific noise, respectively.
図 1 8は、 同じ 3種のファンについて、 静圧 P s = 1 O mmAq及び風量 Q = 3 mVmin を達成する回転数 （本発明のファン ： 1 7 1 5 r p m、 従来の ラジアルファン ： 2 7 9 0 r p m、 従来のシロッコファン ： 2 2 8 0 r p m) における性能の試験結果を示した図。  Figure 18 shows the number of rotations that achieve the static pressure P s = 1 O mmAq and the air flow Q = 3 mVmin for the same three types of fans (fan of the present invention: 17 15 rpm, conventional radial fan: 27 The figure which showed the test result of the performance in 90 rpm and the conventional sirocco fan: 228 rpm).
図 1 9は、図 1及び図 2に示した本発明のファン、従来のラジアルファン、 従来の多層円板ファン、 従来のシロッコファン及び従来のターボファンとい う 5種類のファンについて、 全圧効率の試験結果を示した図。  Fig. 19 shows the total pressure efficiency of the five types of fans shown in Figs. 1 and 2, the conventional fan, the conventional radial fan, the conventional multi-layer disc fan, the conventional sirocco fan, and the conventional turbo fan. The figure which showed the test result of.
図 2 0は、 本発明のファンを用いた送風装置の一実施形態の断面図。 発明を実施するための最良の幵態  FIG. 20 is a cross-sectional view of one embodiment of a blower using the fan of the present invention. Best mode for carrying out the invention
図 1は本発明の一実施形態にかかる多翼遠心フアンを空気吸入口のある先 端側から見た平面図、 図 2は図 1の A— A線に沿った同ファンの断面図であ る。 尚、 本明細書で「先端側」 とは多翼遠心ファンの空気吸入口の側を指し、 「基端側」 とは回転基板 1の側を指す。  FIG. 1 is a plan view of a multi-blade centrifugal fan according to an embodiment of the present invention as viewed from the front end side having an air intake port. FIG. 2 is a cross-sectional view of the fan taken along line AA in FIG. You. In this specification, the “tip side” refers to the side of the air intake port of the multi-blade centrifugal fan, and the “proximal side” refers to the side of the rotating board 1.
図示のように、 円形の平面形状をもつ回転基板 1上に、 多数枚 （例えば、 1 0 0枚程度） の第 1羽根板 3が回転軸 Cと平行に立設されている。 これら 多数枚の第 1羽根板 3は、 回転基板 1の外周縁に沿って回転軸 Cを中心とす る円環状に一定ピッチで配列されている。 これら第 1羽根板 3の円環状列の 外周基端部は補強リング 4によって連結されている。 基板 1を矢印 B方向に 回転させると、 第 1羽根板 3の円環状列は 「第 1の遠心ファン」 として機能 する。 つまり、 第 1羽根板 3の円環状列は、 図 2に矢印 W 1で空気の流れを 示すように、 その内周側空間 5内へ先端側開口 7から外気を吸入し、 その吸 入した空気を羽根板 3間の隙間を通して外周側へ吹出すように作用する。 内周側空間 5へ吸入された空気を周囲の羽根板 3側へスムーズに流すため、 内周側空間 5の底面をなす基板 1はその中央部が先端側へ幾分持上がって、 中央部から周囲へ向かって適度なスロープを形成している。 また、 内周側空 間 5内の空気を羽根板 3間の隙間へ取り込み易くするために、幅の異なる（つ まり、 内周側への突出量の異なる） 2種類の羽根板 3 L、 3 Sが第 1羽根板 3として用いられ、 その 2種類の羽根板 3 L、 3 Sが交互に配列されている。 さらに、 これと同目的のために、 第 1羽根板 3は図 1に示すように、 その内 周側及び外周側の端部が回転方向 Bに対して鋭角をなすように湾曲した前進 翼となって多翼の 「シロヅファン」 を構成している。 しかし、 必ずしもこの ようになつている必要はなく、 例えば、 第 1羽根板 3の全てが同じ幅 （つま り、 内周側への突出量が同じ） であってもよいし、 また、 第 1羽根板 3が平 板状で 「ラジアルファン」 を構成していてもよいし、 第 1羽根板 3が後退翼 で 「ターボファン」 を構成していてもよい。 As shown in the figure, a large number (for example, about 100) of first blade plates 3 are erected on a rotating substrate 1 having a circular planar shape in parallel with the rotation axis C. These multiple first blade plates 3 are arranged at a constant pitch along the outer peripheral edge of the rotating substrate 1 in an annular shape around the rotation axis C. The outer peripheral base ends of the annular rows of the first blade plates 3 are connected by a reinforcing ring 4. When the substrate 1 is rotated in the direction of arrow B, the annular row of the first blades 3 functions as a “first centrifugal fan”. In other words, the annular row of the first blades 3 shows the air flow indicated by the arrow W1 in FIG. As shown in the drawing, outside air is sucked into the inner circumferential space 5 from the front end side opening 7 and acts to blow out the sucked air to the outer circumferential side through the gap between the blade plates 3. In order to allow the air sucked into the inner peripheral space 5 to flow smoothly to the surrounding blades 3, the center of the substrate 1, which forms the bottom surface of the inner peripheral space 5, is slightly lifted to the tip end, and It forms a moderate slope from to the surroundings. In addition, in order to make it easier for the air in the inner peripheral space 5 to be taken into the gap between the blades 3, two types of blades 3L having different widths (that is, having different amounts of protrusion to the inner peripheral side) are used. 3 S is used as the first blade 3, and the two types of blades 3 L and 3 S are alternately arranged. Further, for the same purpose, as shown in FIG. 1, the first blade plate 3 has a forward wing whose inner and outer ends are curved so as to form an acute angle with respect to the rotation direction B. It has become a multi-winged "Shiroi Fan". However, it is not always necessary to have such a structure. For example, all of the first blade plates 3 may have the same width (that is, the same amount of protrusion toward the inner peripheral side). The blade 3 may be a flat plate to form a “radial fan”, or the first blade 3 may be a swept wing to form a “turbo fan”.
図 2に示すように、 第 1羽根板 3は、 元々ほぼ長方形であった羽根板 3の 先端外周側の部分を、 内周側から外周側へ向かって先端側から基端側へ向か うように回転軸 Cに対し傾斜したラインに沿つて切除したかの如き形状を有 している。 つまり、 この第 1羽根板 3の先端面は、 上記のように傾斜した面 を有している。そして、 この傾斜した先端面に円環状の導風板 9が接合され、 この導風板 9の外周寄りの表面上に、 多数枚 （例えば、 1 0 0枚程度） の第 2羽根板 1 1が回転軸 Cと平行に立設され円環状に配列されている。  As shown in FIG. 2, the first blade plate 3 moves a portion of the blade plate 3, which was originally substantially rectangular, on the outer periphery of the distal end from the inner peripheral side to the outer peripheral side from the distal end side to the proximal end side. Thus, it has a shape as if it were cut along a line inclined with respect to the rotation axis C. That is, the tip surface of the first blade plate 3 has the inclined surface as described above. An annular air guide plate 9 is joined to the inclined front end surface, and a large number (for example, about 100) of second blade plates 11 are placed on the surface near the outer periphery of the air guide plate 9. Are erected in parallel to the rotation axis C and arranged in an annular shape.
これらの第 2羽根板 1 1は、 径方向に沿ったその幅が第 1羽根板 3よりも 明らかに狭い。 そのため、 第 2羽根板 1 1の円環状列は、 第 1羽根板 3の円 環状列よりも大きい内周径を有していて、 その内周側には、 第 1羽根板 3の 傾斜した先端面との間に空間 1 3が形成されている。 この第 2羽根板 1 1の 円環状列は 「第 2の遠心ファン」 として機能する。 つまり、 基板 1を回転さ せると、 第 2羽根板 1 1の円環状列は、 図 2に矢印 W 2で空気の流れを示す ように、 その内周側空間 1 3内へその先端側開口 1 5から外気を吸入し、 そ の吸入空気を羽根板 1 1間の隙間を通して外周側へ吹出すように作用する。 第 1羽根板 3の内周側空間 5への空気の吸入を良好にするために、 第 2羽 根板 1 1の先端部 1 1 aの高さは第 1羽根板 3の内周側先端部 3 aよりも若 干高くなつている （つまり、 第 1羽根板 3より先端側へ突出している）。 また、 第 2羽根板 1 1の内周側空間 1 3へ吸入された空気を周囲の羽根板 1 1側へ スムーズに導くために、 内周側空間 1 3の底面をなす導風板 9は図 2に示す ように回転軸 Cに対し傾斜し且つ凹弧状に適度に湾曲している。 また、 第 2 羽根板 1 1は第 1羽根板 3と同様に湾曲しているが、 必ずしもそうである必 要はなく、 第 1羽根板 3と異なる形状や枚数 （例えば図 1 3、 1 4に示す実 施形態） であってもよい。 第 2羽根板 1 1の先端外周部は補強リング 1 7に より連結されている。 The width of these second blades 11 along the radial direction is clearly smaller than that of the first blades 3. Therefore, the annular row of the second blades 11 has a larger inner peripheral diameter than the annular row of the first blades 3, and the inner peripheral side of the first blade 3 A space 13 is formed between the inclined tip surface. The annular row of the second blades 11 functions as a “second centrifugal fan”. That is, when the substrate 1 is rotated, the annular row of the second blades 11 is opened into its inner peripheral space 13 as shown by the arrow W2 in FIG. External air is sucked in from 15 and acts to blow out the sucked air to the outer peripheral side through the gap between the blades 11. In order to make air suction into the inner peripheral space 5 of the first blade plate 3 good, the height of the tip 11 a of the second blade 11 is set to the inner tip of the first blade 3. It is slightly higher than the part 3a (that is, it protrudes to the tip side from the first blade 3). In order to smoothly guide the air sucked into the inner peripheral space 13 of the second blade 11 to the surrounding blades 11, the air guide plate 9 forming the bottom surface of the inner peripheral space 13 is As shown in FIG. 2, it is inclined with respect to the rotation axis C and is appropriately curved in a concave arc shape. Further, the second blade 11 is curved like the first blade 3, but it is not always necessary, and the shape and the number of the second blade 11 are different from those of the first blade 3 (for example, FIGS. 13 and 14). Embodiment shown in FIG. The outer periphery of the tip end of the second blade plate 11 is connected by a reinforcing ring 17.
第 1羽根板 3の円環状列の内外径比（内周直径/外周直径）は例えば 6 0 % 〜 6 5 %程度、第 2羽根板 1 1の円環状列の内外径比は例えば 8 5 %〜 9 0 % 程度であるが、 必ずしもそうである必要はなく、 他の値であってもよい。 以上の構成をもつ多翼遠心ファンは、 例えば合成樹脂を用いて射出成形法 などで一体的に製造することができるが、 金属などの他の材料や他の方法に よっても製造できることは言うまでもない。  The inner / outer diameter ratio (inner diameter / outer diameter) of the annular row of the first blades 3 is, for example, about 60% to 65%, and the inner / outer diameter ratio of the annular row of the second blades 11 is, for example, 85%. % To about 90%, but it is not necessary to be so, and other values may be used. The multi-blade centrifugal fan having the above configuration can be integrally manufactured by, for example, injection molding using synthetic resin, but it is needless to say that it can be manufactured by other materials such as metal and other methods. .
この多翼遠心ファンを回転させると、 既に述べたとおり、 第 1羽根板 3の 円環状列も第 2羽根板 1 1の円環状列もそれそれ 「遠心ファン」 として機能 する。 つまり、 第 1羽根板 3の円環状列は、 その内周側空間 5内へ先端側開 口 7から外気を吸入し、 その吸入空気を羽根板 3間の隙間を通して外周側へ 吹出す。 また、 第 2羽根板 1 1の円環状列は、 その内周側空間 1 3内へその 先端側開口 1 5から外気を吸入し、 その吸入空気を羽根板 1 1間の隙間を通 して外周側へ吹出す。 ここで、 第 2羽根板 1 1の遠心ファン作用が主に働く 場所は、 第 1羽根板 3の切除されたが如くになっている先端外周側の部分で ある。 この部分は、 従来技術の欄で既に説明した通り、 もしこの部分にまで 第 1羽根板 3が延在していたとすると、 比較的に効率が悪く送風量が小さい 点で従来から問題視されていた部分である。 本実施形態は、 第 1羽根板 3に よる 「第 1の遠心ファン」 のこの問題部分が切除されて、 内周側空間 1 3を もった第 2羽根板 1 1による 「第 2の遠心ファン」 に置き換えられたものと 説明することができる。また、 「第 2の遠心ファン」の底面をなす導風板 9は、 その傾斜と湾曲によって内周側空間 1 3に吸入された空気を第 2羽根板 1 1 の方へ流れ易くしている。 このような 「第 2の遠心ファン」 の効果として、 この問題部分の風量が向上し、 もって全体の風量が増大する。 この風量増大 効果は、従来技術の欄で説明したような斜流フアンを用いたものに比較して、 より大きいものである。 また、 送風量が大きいということは、 同じ送風量を 得るためにより小型で済むという利点にもなる。 When the multi-blade centrifugal fan is rotated, the annular row of the first blades 3 and the annular row of the second blades 11 each function as a “centrifugal fan” as described above. In other words, the annular row of the first blades 3 draws outside air into the inner circumferential space 5 from the front-end opening 7, and flows the sucked air toward the outer circumference through the gap between the blades 3. Blow out. In addition, the annular row of the second blades 11 sucks outside air into the inner peripheral space 13 from the opening 15 on the tip side, and passes the intake air through the gap between the blades 11. Blow out to the outer side. Here, the place where the centrifugal fan action of the second blade plate 11 mainly works is a portion of the first blade plate 3 on the outer peripheral side of the tip as if it were cut off. As described above in the section of the prior art, if the first blade plate 3 extends to this portion, this portion has been conventionally regarded as a problem in that the efficiency is relatively low and the air flow rate is small. Part. In the present embodiment, this problematic part of the “first centrifugal fan” by the first blade plate 3 is cut away, and the “second centrifugal fan” by the second blade plate 11 having the inner circumferential space 13 is removed. Can be explained as having been replaced by Further, the air guide plate 9 forming the bottom surface of the “second centrifugal fan” facilitates the flow of the air drawn into the inner peripheral space 13 to the second blade plate 11 by its inclination and curvature. . As an effect of such a “second centrifugal fan”, the air volume in this problem part is improved, and thus the overall air volume is increased. This effect of increasing the air volume is greater than that using the mixed flow fan as described in the section of the prior art. In addition, a large air flow has the advantage of requiring a smaller size to obtain the same air flow.
本発明は上述した実施形態のみに限らず、 それ以外の種々の形態でも実施 することができる。 その中の幾つかの代表的な実施形態を以下に例示し、 図 1、 2に示した実施形態との相違を説明する。  The present invention is not limited to the above-described embodiment, but can be implemented in other various forms. Some representative embodiments are illustrated below, and differences from the embodiments shown in FIGS. 1 and 2 will be described.
図 3の断面図に示す多翼遠心フアンは、 第 1羽根板 3の内周側先端部 3 a の高さが、 第 2羽根板 1 1の先端部 1 1 aの高さと同じなつているものであ る。 図 4の断面図に示す多翼遠心ファンは、 第 1羽根板 3の内周側先端部 3 aが、 第 2羽根板 1 1の先端部 1 1 aより若干高くなつているものである。 このように、 第 1羽根板 3と第 2羽根板 1 1の先端部の高さは同一でも多少 異なっていてもよい。 しかし、 図 2に示した実施形態のように、 第 1羽根板 3の先端高さが第 2羽根板 1 1のそれより若干低い方が、 より好ましい風量 増加効果が得られる。 In the multi-blade centrifugal fan shown in the cross-sectional view of FIG. 3, the height of the tip 3a on the inner circumferential side of the first blade plate 3 is the same as the height of the tip 11a of the second blade plate 11. It is. In the multi-blade centrifugal fan shown in the cross-sectional view of FIG. 4, the tip 3a on the inner circumferential side of the first blade plate 3 is slightly higher than the tip 11a of the second blade plate 11. As described above, the heights of the tip portions of the first blade plate 3 and the second blade plate 11 may be the same or slightly different. However, as in the embodiment shown in FIG. When the height of the tip 3 is slightly lower than that of the second blade 11, a more preferable air volume increasing effect can be obtained.
図 5の断面図に示す多翼遠心ファンは、 導風板 9 (つまり、 第 1羽根板の 傾斜した先端面） が湾曲せずに直線的に傾斜しているものである。  In the multi-blade centrifugal fan shown in the cross-sectional view of FIG. 5, the air guide plate 9 (that is, the inclined front end face of the first blade plate) is not curved but linearly inclined.
図 6の断面図に示す多翼遠心ファンは、 導風板 9を全く持たず、 各第 1羽 根板 3と各第 2羽根板 1 1とは 1枚の羽根板として形成されているものであ る。  The multi-blade centrifugal fan shown in the sectional view of FIG. 6 has no baffle plate 9 and each first blade plate 3 and each second blade plate 11 are formed as one blade plate. It is.
図 7の断面図に示す多翼遠心ファンは、 導風板 9が第 2羽根板 1 1の内周 側空間 1 3の底部にだけ形成されており、 各第 1羽根板 3と各第 2羽根板 1 1とは 1枚の羽根板として形成されているものである。  In the multi-blade centrifugal fan shown in the cross-sectional view of FIG. 7, the air guide plate 9 is formed only at the bottom of the inner peripheral space 13 of the second blade plate 11, and the first blade plate 3 and the second The blade 11 is formed as one blade.
図 8の断面図に示す多翼遠心ファンは、 導風板 9が第 2羽根板 1 1の基端 部にだけ形成されており、 第 2羽根板 1 1の内周側空間 1 3の底部には導風 板 9が無いものである。  In the multi-blade centrifugal fan shown in the cross-sectional view of FIG. 8, the air guide plate 9 is formed only at the base end of the second blade plate 11, and the bottom of the inner peripheral space 13 of the second blade plate 11 is formed. Has no baffle plate 9.
図 9の断面図に示す多翼遠心フアンは、 導風板 9が第 1羽根板 3の先端面 の全域を覆っているものである。  In the multi-blade centrifugal fan shown in the cross-sectional view of FIG. 9, the air guide plate 9 covers the entire front end surface of the first blade plate 3.
図 1 0の断面図に示す多翼遠心ファンは、 羽根板 3、 1 1の外周に、 複数 本の環状整流板 1 9を取付けた （又は、 1本の環状整流板 1 9をスパイラル 状に複数回巻き付けた） ものである。 環状整流板 1 9は、 羽根板 3、 1 1の 間から吹出す気流の疎密状態を緩和し、風量の増大や騒音の低減に寄与する。 環状整流板 1 9は厚みが薄くかつ径方向の幅も狭いことがのそましく、また、 その断面形状には、 図示した長方形の他、 正方形、 三角形、 その他の適当な 多角形や流線形など種々のものが採用し得る。  The multi-blade centrifugal fan shown in the cross-sectional view of FIG. 10 has a plurality of annular rectifying plates 19 mounted on the outer periphery of the blades 3 and 11 (or one annular rectifying plate 19 is formed in a spiral shape). (Wrapped multiple times). The annular baffle 19 reduces the density of the airflow blown out between the blades 3 and 11, thereby contributing to an increase in air volume and a reduction in noise. It is preferable that the annular current plate 19 is thin and has a narrow width in the radial direction. In addition to the rectangular shape shown in the drawing, the cross-sectional shape may be square, triangular, or any other suitable polygon or streamline. Various things can be adopted.
図 1 1の断面図に示す多翼遠心ファンは、 回転基板 1の外周縁が第 1羽根 板 3の円環状列の外周縁まで広がっていて第 1羽根板 3の円環状列の基端面 3 aを完全に塞いでいる。 しかし、 図 1〜図 1 0に示したもののように、 第 1羽根板 3の円環状列の基端面が開放されていた方が、 その基端面からも風 が吹出せるので、 より多くの風量が得られる。 In the multi-blade centrifugal fan shown in the cross-sectional view of FIG. 11, the outer peripheral edge of the rotating board 1 extends to the outer peripheral edge of the annular row of the first blades 3, and the base end face 3 of the annular row of the first blades 3. a is completely closed. However, as shown in FIGS. When the base end face of the annular row of the blades 3 is open, the wind can be blown out from the base end face, so that a larger air volume can be obtained.
図 1 2の断面図に示す多翼遠心ファンは、 補強リング 1 7の内周縁が第 2 羽根板の円環状列の内周縁まで伸びていて第 2羽根板の円環状列の先端面 1 l aを完全に塞いでいる。 また、 この形態において、 図 7の形態と同様に第 2羽根板 1 1と第 1羽根板 3との間に導風板 9が無く、 第 2羽根板 1 1と第 1羽根板 3とが 1枚の羽根板として構成されていてもよい。  In the multi-blade centrifugal fan shown in the cross-sectional view of Fig. 12, the inner peripheral edge of the reinforcing ring 17 extends to the inner peripheral edge of the annular row of the second blades, and the tip surface of the annular row of the second blades 1 la Is completely obstructed. Further, in this embodiment, similarly to the embodiment of FIG. 7, there is no air guide plate 9 between the second blade plate 11 and the first blade plate 3, and the second blade plate 11 and the first blade plate 3 It may be configured as one blade plate.
図 1 3は更に別の実施形態にかかる多翼遠心ファンの前端側から見た平面 図であり、 図 1 4はその D— D線に沿った断面図である。 この多翼遠心ファ ンの主たる特徴は、 第 2羽根板 1 1の円環状列の外周径が、 第 1羽根板 3の 円環状列の外周径より大きくなつている点である。 これに伴って、 第 2羽根 板 1 1の円環状列の内周径も、 図 1〜図 1 2に示したものより大きく、 例え ば図示のように第 1羽根板 3の外周径と実質的に同径に設計されている。 従 つて、 第 2羽根板 1 1の大部分は第 1羽根板 3の外周側へ張り出している。 必然的に、 第 2羽根板 1 1の形状や枚数の設計も、 第 1羽根板 3のそれから 独立してなされており、 例えば図示のように第 2羽根板 1 1の枚数は 6 0枚 程度であり 「多翼シロッコファン」 を構成している （しかし、 必ずしもそう である必要はなく、 「ラジアルファン」 や 「ターボファン」 を構成していても よいし、 枚数も第 1羽根板 3と同様であってもよい）。 また、 第 2羽根板 1 1 の第 1羽根板 3より外方へ張り出した部分の基端面は、 図示のように導風板 9で覆われているが、 ここを導風板 9で覆わずに開放してもよい （開放した 場合、 第 2羽根板 1 1の基端外周部を追加の補強リングで結合することが、 十分な強度を得るために望ましい）。  FIG. 13 is a plan view of a multi-blade centrifugal fan according to still another embodiment as viewed from the front end side, and FIG. 14 is a cross-sectional view along the line DD. The main feature of this multi-blade centrifugal fan is that the outer diameter of the annular row of the second blades 11 is larger than the outer diameter of the annular row of the first blades 3. Accordingly, the inner peripheral diameter of the annular row of the second blade plate 11 is also larger than that shown in FIGS. 1 to 12, for example, as shown in the drawing, substantially equal to the outer diameter of the first blade plate 3. It is designed to have the same diameter. Therefore, most of the second blade plate 11 protrudes toward the outer peripheral side of the first blade plate 3. Inevitably, the shape and number of the second blades 11 are also designed independently of those of the first blades 3, for example, as shown, the number of the second blades 11 is about 60 And constitutes a “multi-blade sirocco fan” (however, this need not be the case; it may constitute a “radial fan” or a “turbo fan”, and the number of blades may be the same as that of the first blade 3). It may be the same). In addition, the base end surface of the portion of the second blade plate 11 that protrudes outward from the first blade plate 3 is covered with the baffle plate 9 as shown in the figure, but is not covered with the baffle plate 9. (In this case, it is desirable to connect the outer periphery of the base end of the second blade 11 with an additional reinforcing ring in order to obtain sufficient strength).
この図 1 3、 1 4に示す多翼遠心ファンは、 第 2羽根板 1 1による 「第 2 遠心ファン」 の内周側空間 1 3が広く、 かつその外周径も大きいため、 風量 増大効果が一層高い。 In the multi-blade centrifugal fan shown in FIGS. 13 and 14, the inner space 13 of the “second centrifugal fan” formed by the second blade plate 11 is wide and the outer diameter is large. The increasing effect is even higher.
図 15は、 図 13、 14に示した多翼遠心ファンと、 従来の基本構造の多 翼遠心ファンとの性能の試験結果を示す P— Q線図 （横軸が風量 Q、 縦軸が 静圧 P sを示す） である。 試験した 2種類のファンは実質的に同じ外形サイ ズもっていた。 図 15において、 直線で対応付けられたサンプル点は 2種類 のファンの同じ回転数の動作点を示し、 そのときの回転数 （rpm) は各サ ンプル点の脇に記載されている。  Fig. 15 is a P-Q diagram showing the performance test results of the multi-blade centrifugal fan shown in Figs. 13 and 14 and the conventional multi-blade centrifugal fan with the basic structure (air volume Q on the horizontal axis, static on the vertical axis). Pressure Ps). The two types of fans tested had substantially the same external size. In FIG. 15, the sample points associated with the straight lines indicate the operating points of the two types of fans having the same rotational speed, and the rotational speeds (rpm) at that time are described beside each sample point.
図 15から分かるように、 本発明の実施形態は、 従来の基本構造と比較し て、 同じ回転数において、 より高い静圧域が得られると同時により大きい風 量を供給できることが分かる。  As can be seen from FIG. 15, it can be seen that the embodiment of the present invention can provide a higher static pressure range and supply a larger air volume at the same rotation speed as compared with the conventional basic structure.
図 16及び図 17は、 図 1、 2に示した本発明の多翼遠心ファン （但し、 全ての第 1の羽根板 3が同じ幅をもつ）、 従来のシロッコファン及び従来のラ ジアルファンの 3種類のファンについて、 2000 rpm—定の回転数にお ける性能の試験結果を示す。 図 16では、 横軸が風量 Q、 縦軸が静圧 P s及 び騒音レベル LA を示す。 図 17では、 図 16の風量 Q、 縦軸の静圧 P s及 び騒音レベル L A が流量係数、 圧量係数、 比騒音にそれそれ正規化されてい る。 また、 図 18は、 同じ 3種のファンについて、 静圧 P s= 10mmAq及 び風量 Q= 3m3/minを達成する回転数 （本発明のファン ： 1715 rpm, 従来のラジアルファン ： 2790 r pm、 従来のシロッコファン ： 2280 rpm) における性能の試験結果を示す。 図 18では、 横軸が風量 Q、 縦軸 が静圧 P s及び騒音レベル L A を示す。 試験した 3種類のファンは、 外径が 125 mm, 長さが 55 mmという同じ外形サイズをもっていた。 本発明の ファンは、 100枚の湾曲した第 1の羽根板をもち、 その内径が 92mmで あり、 かつ 120枚の湾曲した第 2の羽根板をもち、 その内径が 1 10mm であった。 従来のラジアルファンは、 120枚の真っ直ぐな羽根板をもち、 その内径は 9 5 mmであった。 従来のシロッコファンは、 1 0 0枚の湾曲し た羽根板をもち、 その内径は 9 5 mmであった。 16 and 17 show the multi-blade centrifugal fan of the present invention shown in FIGS. 1 and 2 (however, all the first blades 3 have the same width), the conventional sirocco fan and the conventional radial fan. The results of performance tests at 2000 rpm—constant rotation speed for each type of fan are shown. In Fig. 16, the horizontal axis represents the airflow Q, and the vertical axis represents the static pressure Ps and the noise level LA. In Fig. 17, the air volume Q, the static pressure P s on the vertical axis, and the noise level LA in Fig. 16 are normalized to a flow coefficient, a pressure coefficient, and a specific noise, respectively. Fig. 18 shows the number of rotations that achieve the static pressure P s = 10 mmAq and the air flow Q = 3 m 3 / min for the same three types of fans (fan of the present invention: 1715 rpm, conventional radial fan: 2790 rpm) The results of the performance test at a conventional sirocco fan at 2280 rpm are shown. In Fig. 18, the horizontal axis shows the airflow Q, and the vertical axis shows the static pressure Ps and the noise level LA. The three fans tested had the same external dimensions of 125 mm outside diameter and 55 mm length. The fan of the present invention had 100 curved first blades, had an inner diameter of 92 mm, and had 120 curved second blades, and had an inner diameter of 110 mm. Conventional radial fans have 120 straight blades, Its internal diameter was 95 mm. A conventional sirocco fan had 100 curved blades and an inner diameter of 95 mm.
図 1 6〜図 1 8から、 本発明のファンは、 同じ外形サイズをもつ従来のラ ジアル及びシロッコフアンに比較して、 格段に優れた P - Q特性と静音性を もつことが分かる。  From FIG. 16 to FIG. 18, it can be seen that the fan of the present invention has much better P-Q characteristics and quietness than the conventional radial and sirocco fans having the same external size.
図 1 9は、図 1及び図 2に示した本発明のファン、従来のラジアルファン、 従来の多層円板ファン、 従来のシロッコファン及び従来の夕一ボファンとい う 5種類のファンについて、 全圧効率の試験結果を示す。 試験した 5種類の ファンは実質的に同じ外形サイズをもっていた。  Fig. 19 shows the total pressure of the five types of fans shown in Figs. 1 and 2, the conventional radial fan, the conventional multilayer disc fan, the conventional sirocco fan, and the conventional evening fan. The efficiency test results are shown. The five fans tested had substantially the same external size.
図 1 9から、 本発明のファンは、 従来の各種のファンに比較して、 特に夕 ーボファンに比較しても、 格段に効率が高いことが分かる。  From FIG. 19, it can be seen that the efficiency of the fan of the present invention is much higher than that of various conventional fans, especially when compared with the evening fan.
図 2 0は、 本発明の多翼ファンを用いた送風装置の一実施形態の概略的な 断面構造を示す。  FIG. 20 shows a schematic cross-sectional structure of one embodiment of a blower using the multi-blade fan of the present invention.
図 2 0に示す送風装置 1 0 0は、 例えば浴室衣類乾燥装置、 空気調和機、 浴室や台所やトイレなどの換気装置、 給湯機のような燃焼機器、 及び手乾燥 装置、 エアカーテン装置などにおける送風装置や給排気装置に適している。 また、 この送風装置 1 0 0は、 冷蔵庫、 暖房装置、 複写機やコンピュータな どの電子機器、 及びトイレの局部洗浄装置などにおける送風装置としても利 用できる。 図 2 0に示すように、 この送風装置 1 0 0は、 空気入り口 1 0 9 と空気出口 1 1 1をもった外ケース 1 0 1を有する。 この外ケース 1 0 1内 の空気入り口 1 1 9から空気出口 1 1 1に至る空気流路 1 1 3中に、 ファン ケース 1 0 5に収まった本発明の多翼ファン 1 0 7が配置されている。 必要 があれば、 空気の加熱、 冷却又は乾燥などを行うための、 例えばヒー夕、 冷 却器又は熱交換器などのような空気調節器 1 0 3も、 空気流路 1 1 3中に設 けられる。 空気調節器 1 0 3は、 空気入り口 1 0 9の近傍か、 又は点線で示 すように空気出口 1 0 3か、 又はその他の適切な場所に配置することができ る。 矢印で示すように、 本発明のファン 1 0 7が回転すると、 外の空気が空 気入り口 1 0 9からこの送風装置 1 0 0内に入り空気出口 1 0 3から外へ吹The blower 100 shown in FIG. 20 is used in, for example, a bathroom clothes dryer, an air conditioner, a ventilation device such as a bathroom, a kitchen or a toilet, a combustion device such as a water heater, a hand dryer, an air curtain device, and the like. Suitable for blower and air supply / exhaust device. The blower 100 can also be used as a blower in a refrigerator, a heating device, an electronic device such as a copying machine or a computer, and a local cleaning device for a toilet. As shown in FIG. 20, the blower 100 has an outer case 101 having an air inlet 109 and an air outlet 111. A multi-blade fan 107 of the present invention housed in a fan case 105 is arranged in an air flow passage 113 extending from an air inlet 111 to an air outlet 111 in the outer case 101. ing. If necessary, air conditioners 103, such as heaters, coolers or heat exchangers, for heating, cooling or drying the air, etc., should also be provided in the air passage 113. Be killed. The air conditioner 103 is shown near the air inlet 109 or by a dotted line. It can be located at the air outlet 103 as well as at any other suitable location. As indicated by the arrow, when the fan 107 of the present invention rotates, outside air enters the blower 100 from the air inlet 109 and blows out from the air outlet 103.
5出され 5 issued
当業者は、 ίした 態以外の種々の態様でも本発明を容易に «すること ができるはずである。例えば、 本発明の多翼ファンは、 上に例示した幾つかの実施 形態の構成要素を部分的に組合せた形態でも^ ¾できる。 また、 既に述べたとおり、 シロッコファンだけでなくラジアルファンや夕一ボファンなど種々のタイプのフ アンにも適用できる。 また、 上述した 態はいずれも、 大小の内周径をもつ 2 段の遠心ファンから構成されているが、 本発明の原理は、 この 2 造のみならず 3段以上の構造にも; itfflすることもできる。  Those skilled in the art should be able to easily refer to the present invention in various embodiments other than the embodiments described above. For example, the multi-blade fan of the present invention can also be configured by partially combining the components of some of the embodiments described above. Also, as already mentioned, it can be applied not only to sirocco fans but also to various types of fans such as radial fans and Yuichibo fans. Further, each of the above-described embodiments is constituted by a two-stage centrifugal fan having large and small inner diameters. However, the principle of the present invention is not limited to these two structures but also to a structure having three or more stages; You can also.

Claims

請 求 の 範 囲 The scope of the claims
1 . 回転基板上に配列された複数枚の第 1の羽根板を有する、 比較的小 さい内周径をもつ第 1の遠心ファンと、  1. a first centrifugal fan having a relatively small inner diameter, having a plurality of first blades arranged on a rotating substrate;
前記第 1の遠心ファンの先端側に配列された複数枚の第 2の羽根板を有す る、比較的大きい内周径をもつ第 2の遠心ファンとを備えた多翼遠心ファン。  A multi-blade centrifugal fan, comprising: a second centrifugal fan having a relatively large inner peripheral diameter, the second centrifugal fan having a plurality of second blades arranged on the tip side of the first centrifugal fan.
2 . 前記第 2の羽根板が、前記第 1の羽根板より径方向に狭い幅を有し、 前記第 1の羽根板の先端側の外周寄りに配置されている請求項 1記載の多翼 遠心ファン。  2. The multi-blade according to claim 1, wherein the second blade has a width smaller in a radial direction than the first blade, and is arranged near an outer periphery on a tip end side of the first blade. Centrifugal fan.
3 . 前記第 1の遠心ファンの先端面が、 回転軸に対し内周側から外周側 へ向かって先端側から基端側へと向かうよう傾斜した面を有しており、 この 傾斜した先端面上の外周寄りに前記第 2の羽根板が配置されている請求項 1 記載の多翼遠心ファン。  3. The distal end surface of the first centrifugal fan has a surface inclined from the inner peripheral side to the outer peripheral side with respect to the rotating shaft from the distal end side to the base end side, and the inclined distal end surface The multi-blade centrifugal fan according to claim 1, wherein the second blade plate is arranged near an upper outer periphery.
4 . 前記第 1の遠心ファンの先端面の少なくとも一部に接合された円環 状の導風板を更に備えた請求項 1記載の多翼遠心ファン。  4. The multi-blade centrifugal fan according to claim 1, further comprising an annular air guide plate joined to at least a part of a front end surface of the first centrifugal fan.
5 . 前記傾斜した先端面が凹弧状に湾曲している請求項 3記載の多翼遠 心ファン。  5. The multi-blade centrifugal fan according to claim 3, wherein the inclined front end surface is curved in a concave arc shape.
6 . 前記第 2の羽根板の先端部が前記第 1羽根板の先端部より高い請求 項 1記載の多翼遠心ファン。  6. The multi-blade centrifugal fan according to claim 1, wherein the tip of the second blade is higher than the tip of the first blade.
7 . 前記第 1の羽根板及び第 2の羽根板の少なくとも一方の外周に、 環 状の整流板が取付けられている請求項 1記載の多翼遠心ファン。  7. The multi-blade centrifugal fan according to claim 1, wherein an annular current plate is attached to at least one outer periphery of the first blade plate and the second blade plate.
8 . 前記第 1羽根板が前記回転基板の外周縁に沿って配列されている請 求項 1記載の多翼円遠心ファン。  8. The multi-blade circular centrifugal fan according to claim 1, wherein the first blade plate is arranged along an outer peripheral edge of the rotating board.
9 . 前記第 2羽根板の列の外周径が前記第 1羽根板の列の外周径ょり大 きい請求項 1記載の多翼遠心ファン。  9. The multi-blade centrifugal fan according to claim 1, wherein the outer diameter of the row of the second blades is greater than the outer diameter of the row of the first blades.
1 0 . 異なる内周径をもつ複数の遠心ファンを備え、 比較的小さい内周径をもつ遠心ファンの先端側に比較的大きい内周径をも つ遠心ファンが配置されている多翼遠心ファン。 10. Equipped with multiple centrifugal fans with different inner circumferences, A multi-blade centrifugal fan in which a centrifugal fan with a relatively large inner diameter is arranged at the tip of a centrifugal fan with a relatively small inner diameter.
1 1 . 前記比較的小さい内周径をもつ遠心ファンの先端面が、 回転軸に 対し内周側から外周側へ向かつて先端側から基端側へと向かうよう傾斜した 面を有しており、 この傾斜した先端面上の外周寄りに前記比較的大きい内周 径をもつ遠心ファンが配置されている請求項 1 0記載の多翼遠心ファン。  1 1. The distal end surface of the centrifugal fan having a relatively small inner peripheral diameter has a surface inclined from the inner peripheral side to the outer peripheral side with respect to the rotating shaft and from the distal end side to the proximal end side. 10. The multi-blade centrifugal fan according to claim 10, wherein a centrifugal fan having the relatively large inner diameter is arranged near an outer circumference on the inclined front end surface.
1 2 . 前記比較的大きい内周径をもつ遠心ファンの外周径が前記比較的 大きい内周径をもつ遠心ファンの外周径より大きい請求項 1 0記載の多翼遠 心ファン。  12. The multi-blade centrifugal fan according to claim 10, wherein the outer diameter of the centrifugal fan having the relatively large inner diameter is larger than the outer diameter of the centrifugal fan having the relatively large inner diameter.
1 3 . 回転基板上に配列された、 径方向に比較的に広い幅をもつ複数枚 の第 1の羽根板と、  13. A plurality of first blades arranged on a rotating substrate and having a relatively large width in a radial direction,
前記第 1の羽根板の列の先端側の外周寄りに配列された、 径方向に比較的 に狭い幅をもつ複数枚の第 2の羽根板と  A plurality of second blades having a relatively narrow width in the radial direction, which are arranged near the outer periphery on the distal end side of the row of the first blades;
を備えた多翼遠心ファン。 Multi-blade centrifugal fan with.
1 4 . 回転基板上に配列された複数枚の羽根板を備え、  1 4. Equipped with a plurality of blades arranged on a rotating substrate,
前記羽根板が、 径方向に比較的に広い幅をもつ第 1の部分と、 この第 1の 部分の先端側外周寄りに配置された径方向に比較的に狭い幅をもつ第 2の部 分とを有する多翼遠心ファン。  A first portion having a relatively wide width in the radial direction, and a second portion having a relatively narrow width in the radial direction disposed near the outer periphery on the distal end side of the first portion. And a multi-blade centrifugal fan.
1 5 . 回転基板上に配列された複数枚の羽根板を備え、  1 5. Equipped with a plurality of blades arranged on a rotating substrate,
前記羽根板が、 比較的に小さい内周径をもって配列された第 1の部分と、 この第 1の部分の先端側に配置され、 比較的に大きい内周径をもって配列さ れた第 2の部分とを有する多翼遠心ファン。  A first portion in which the blades are arranged with a relatively small inner diameter; and a second portion arranged on the tip side of the first portion and arranged with a relatively large inner diameter. And a multi-blade centrifugal fan.
1 6 . 回転基板上に配列された複数枚の羽根板を備え、  1 6. Equipped with a plurality of blades arranged on a rotating substrate,
前記羽根板の列の内周面の形状が、 基端側から先端側に向かつて径が段階 的に拡大するような形状である多翼遠心ファン。 A multi-blade centrifugal fan, wherein the shape of the inner peripheral surface of the row of the blades is such that the diameter gradually increases from the base end toward the tip end.
1 7 . 空気入り口と空気出口と空気流路をもったケ一シングと、 前記空気流路中に配置された多翼遠心ファンと 17. A casing having an air inlet, an air outlet, and an air flow path, and a multi-blade centrifugal fan disposed in the air flow path.
を備え、 前記多翼遠心ファンが、 The multi-blade centrifugal fan comprises:
回転基板上に配列された複数枚の第 1の羽根板を有する、 比較的小さい内 周径をもつ第 1の遠心ファンと、  A first centrifugal fan having a relatively small inner diameter, having a plurality of first blades arranged on a rotating substrate;
前記第 1の遠心ファンの先端側に配列された複数枚の第 2の羽根板を有す る、 比較的大きい内周径をもつ第 2の遠心ファンと  A second centrifugal fan having a relatively large inner diameter, comprising a plurality of second blades arranged on the tip side of the first centrifugal fan;
を有する送風装置。 A blower having:
1 8 . 前記空気流路中に更に空気調節器を備えた請求項 1 7記載の送風装置。 18. The blower according to claim 17, further comprising an air regulator in the air flow path.
1 9 . 空気入り口と空気出口と空気流路をもったケーシングと、 前記空気流路中に配置された多翼遠心ファンと 1 9. A casing having an air inlet, an air outlet, and an air flow path, and a multi-blade centrifugal fan arranged in the air flow path.
を備え、 With
前記多翼遠心ファンが、 異なる内周径をもつ複数の遠心ファン部分を備え、 比較的小さい内周怪をもつ遠心ファン部分の先端側に比較的大きい内周径を もつ遠心ファン部分が配置されて Lゝる送風装置。 The multi-blade centrifugal fan includes a plurality of centrifugal fan portions having different inner peripheral diameters, and a centrifugal fan portion having a relatively large inner peripheral diameter is disposed at a tip side of the centrifugal fan portion having a relatively small inner peripheral diameter. Air blower.
2 0 . 前記空気流路中に更に空気調節器を備えた請求項 1 9記載の送風  20. The blower according to claim 19, further comprising an air regulator in the air passage.
2 1 . 空気入り口と空気出口と空気流路をもったケーシングと、 前記空気流路中に配置された多翼遠心ファンと 2 1. A casing having an air inlet, an air outlet, and an air flow path, and a multi-blade centrifugal fan arranged in the air flow path.
を備え、 前記多翼遠心ファンが、 The multi-blade centrifugal fan comprises:
回転基板上に配列された、 径方向に比較的に広い幅をもつ複数枚  Plural sheets arranged on a rotating substrate and having a relatively large width in the radial direction
の第 1の羽根板と、 A first slat of
前記第 1の羽根板の列の先端側の外周寄りに配列された、 径方向に比較的 に狭い幅をもつ複数枚の第 2の羽根板と  A plurality of second blades having a relatively narrow width in the radial direction, which are arranged near the outer periphery on the distal end side of the row of the first blades;
を有した送風装置。 A blower having a.
2 2 . 前記空気流路中に更に空気調節器を備えた請求項 2 1記載の送風 22. The blower according to claim 21, further comprising an air conditioner in the air passage.
2 3 . 空気入り口と空気出口と空気流路をもったケーシングと、 前記空気流路中に配置された多翼遠心ファンと 23. A casing having an air inlet, an air outlet, and an air flow path, and a multi-blade centrifugal fan arranged in the air flow path.
を備え、 With
前記多翼遠心ファンが、 回転基板上に配列された複数枚の羽根板を備え、 前記羽根板が、 径方向に比較的に広い幅をもつ第 1の部分と、 この第 1の 部分の先端側外周寄りに配置された径方向に比較的に狭い幅をもつ第 2の部 分とを有する送風装置。  The multi-blade centrifugal fan includes a plurality of blades arranged on a rotating board, wherein the blades have a first portion having a relatively large width in a radial direction, and a tip of the first portion. A second portion having a relatively narrow width in the radial direction, disposed near the side outer periphery.
2 4 . 前記空気流路中に更に空気調節器を備えた請求項 2 3記載の送風  24. The blower according to claim 23, further comprising an air regulator in the air passage.
2 5 . 空気入り口と空気出口と空気流路をもったケ一シングと、 前記空気流路中に配置された多翼遠心ファンと 25. A casing having an air inlet, an air outlet, and an air flow path, and a multi-blade centrifugal fan disposed in the air flow path.
を備え、 With
前記多翼遠心ファンが、 回転基板上に配列された複数枚の羽根板を備え、 前記羽根板が、 比較的に小さい内周径をもって配列された第 1の部分と、 この第 1の部分の先端側に配置され、 比較的に大きい内周径をもって配列さ れた第 2の部分とを有する送風装置。  The multi-blade centrifugal fan includes a plurality of blades arranged on a rotating substrate, wherein the blades are arranged in a first portion having a relatively small inner peripheral diameter; A second portion disposed on the distal end side and arranged with a relatively large inner diameter.
2 6 . 前記空気流路中に更に空気調節器を備えた請求項 2 5記載の送風  26. The blower according to claim 25, further comprising an air regulator in the air flow path.
2 7 . 空気入り口と空気出口と空気流路をもったケ一シングと、 前記空気流路中に配置された多翼遠心ファンと 27. A casing having an air inlet, an air outlet, and an air flow path, and a multi-blade centrifugal fan arranged in the air flow path.
を備え、 With
前記多翼遠心ファンが、 回転基板上に配列された複数枚の羽根板を備え、 前記羽根板の列の内周面の形状が、 基端側から先端側に向かって径が段階 的に拡大するような形状である送風装置。 The multi-blade centrifugal fan includes a plurality of blades arranged on a rotating board, and the shape of the inner peripheral surface of the row of the blades has a step size from a base end to a tip end. A blower that is shaped to expand in size.
2 8 . 前記空気流路中に更に空気調節器を備えた請求項 2 7記載の送風  28. The blower according to claim 27, further comprising an air regulator in the air passage.
PCT/JP1998/002199 1997-05-21 1998-05-20 Multi-blade centrifugal fan WO1998053211A1 (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2386927A (en) * 2002-02-20 2003-10-01 Electrolux Professional Spa Radial fan with inclined blades
JP2005536869A (en) * 2002-05-31 2005-12-02 イェー・ファン・デル・ウェルフ・ホールディング・ベスローテン・フェンノートシャップ Improvements in or relating to cooling of electrical and / or electronic components, in particular computer equipment
WO2006087829A1 (en) * 2005-02-18 2006-08-24 Nidec Copal Electronics Corporation Blower
WO2008075467A1 (en) * 2006-12-18 2008-06-26 Ihi Corporation Cascade of axial compressor
JP2009097448A (en) * 2007-10-17 2009-05-07 Rokugo Mfg Co Ltd Radial fan
JP2012107561A (en) * 2010-11-17 2012-06-07 Toshiba Home Technology Corp Fan
EP2781761A1 (en) * 2013-03-20 2014-09-24 Samsung Electronics Co., Ltd. Centrifugal fan and air conditioner having the same
WO2018138808A1 (en) * 2017-01-25 2018-08-02 三菱電機株式会社 Centrifugal blower

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6087397U (en) * 1983-11-22 1985-06-15 カルソニックカンセイ株式会社 multi-blade fan device
JPH04179899A (en) * 1990-11-14 1992-06-26 Matsushita Electric Ind Co Ltd Electric blower
JPH05240190A (en) * 1992-03-03 1993-09-17 Hitachi Ltd Centrifugal fan
JPH05321891A (en) * 1992-05-21 1993-12-07 Matsushita Seiko Co Ltd Multiblade fan
JPH06257595A (en) * 1993-03-05 1994-09-13 Hitachi Ltd Centrifugal fan and manufacture thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3193222B2 (en) * 1994-02-22 2001-07-30 東芝キヤリア株式会社 Multi-wing blower

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6087397U (en) * 1983-11-22 1985-06-15 カルソニックカンセイ株式会社 multi-blade fan device
JPH04179899A (en) * 1990-11-14 1992-06-26 Matsushita Electric Ind Co Ltd Electric blower
JPH05240190A (en) * 1992-03-03 1993-09-17 Hitachi Ltd Centrifugal fan
JPH05321891A (en) * 1992-05-21 1993-12-07 Matsushita Seiko Co Ltd Multiblade fan
JPH06257595A (en) * 1993-03-05 1994-09-13 Hitachi Ltd Centrifugal fan and manufacture thereof

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2386927A (en) * 2002-02-20 2003-10-01 Electrolux Professional Spa Radial fan with inclined blades
JP2005536869A (en) * 2002-05-31 2005-12-02 イェー・ファン・デル・ウェルフ・ホールディング・ベスローテン・フェンノートシャップ Improvements in or relating to cooling of electrical and / or electronic components, in particular computer equipment
WO2006087829A1 (en) * 2005-02-18 2006-08-24 Nidec Copal Electronics Corporation Blower
WO2008075467A1 (en) * 2006-12-18 2008-06-26 Ihi Corporation Cascade of axial compressor
US8251649B2 (en) 2006-12-18 2012-08-28 Ihi Corporation Blade row of axial flow type compressor
JP2009097448A (en) * 2007-10-17 2009-05-07 Rokugo Mfg Co Ltd Radial fan
JP2012107561A (en) * 2010-11-17 2012-06-07 Toshiba Home Technology Corp Fan
EP2781761A1 (en) * 2013-03-20 2014-09-24 Samsung Electronics Co., Ltd. Centrifugal fan and air conditioner having the same
KR20140115192A (en) * 2013-03-20 2014-09-30 삼성전자주식회사 Circular Fan and Air Conditioner Having the Same
US9624932B2 (en) 2013-03-20 2017-04-18 Samsung Electronics Co., Ltd. Centrifugal fan and air conditioner having the same
KR102143389B1 (en) 2013-03-20 2020-08-28 삼성전자주식회사 Circular Fan and Air Conditioner Having the Same
WO2018138808A1 (en) * 2017-01-25 2018-08-02 三菱電機株式会社 Centrifugal blower

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