WO2008059775A1

WO2008059775A1 - Impeller for multi-blade fan

Info

Publication number: WO2008059775A1
Application number: PCT/JP2007/071878
Authority: WO
Inventors: Masahito Higashida
Original assignee: Daikin Industries, Ltd.
Priority date: 2006-11-14
Filing date: 2007-11-12
Publication date: 2008-05-22
Also published as: EP2096318A1; EP2096318B1; JP2008121611A; EP2096318A4

Abstract

An impeller for a multi-blade fan, in which increase in resistance of the flow of air ejected from the inside to the outer peripheral side of the impeller is suppressed as far as possible and that is integrally formed of a resin to realize high speed rotation of the impeller. The impeller (1) is an impeller for a multi-blade fan for sucking gas from the direction of the rotating shaft and ejecting it to the direction crossing the rotating shaft. The impeller (1) has a substantially circular end plate (11) rotating about the rotating shaft (3) and one or more intermediate rings (14). The blades (12) are annularly arranged about the rotating shaft (3), on one side or both sides of the end plate (11), and one end of each blade is on the outer peripheral section of the end plate (11). The intermediate rings (14) are formed such that, at those positions of the blades (12) that are other than ends on the side opposite the end plate (11), they are not superposed on the blades (12) when viewed in the direction of the rotating shaft and that they connect the outer peripheral edges of the blades (12).

Description

Specification

Impeller of multiblade blower

Technical field

TECHNICAL FIELD [0001] The present invention relates to an impeller of a multiblade blower, and more particularly to an impeller of a multiblade blower that sucks gas from a rotation axis direction and blows out gas in a direction crossing the rotation axis.

Background art

In air cleaners, air conditioners, and the like, a multiblade blower that draws gas in the direction of the rotation axis and blows out gas in a direction that intersects the rotation axis is often used in order to blow air. Such an impeller of a multiblade blower is mainly arranged in a substantially circular end plate that rotates about a rotation axis, and is annularly arranged on the end plate with the rotation axis as the center, and each end is disposed on the outer periphery of the main plate. A plurality of wings provided and an end ring connecting the other ends of the plurality of wings are provided.

In addition, in such an impeller of a multiblade blower, there is an impeller further provided with an intermediate ring between the end plate, the end ring, and the rotation axis direction (see Patent Document 1).

Patent Document 1: JP 2000-320490 A

Disclosure of the invention

[0003] In the above-described impeller of a multiblade blower, it is desired to use the impeller while rotating the impeller at high speed in order to realize downsizing of the impeller and improvement of the blowing capability.

However, if the impeller of the former multiblade fan is rotated at a high speed, the centrifugal force applied to the impeller increases, the concentricity of the impeller cannot be maintained, and the amount of uneven balance increases. The impeller may be greatly deformed and damaged.

On the other hand, the latter impeller of the latter multi-blade fan is provided with an intermediate ring, so that the amount of deformation of the impeller due to centrifugal force is larger than that of the former impeller of the multi-blade fan. Becomes smaller and high speed rotation is possible. However, since the intermediate ring provided in this impeller is provided from the outer peripheral edge to the inner peripheral edge of the blade, the ventilation resistance when blowing from the inside of the impeller to the outer peripheral side increases. The problem power. When manufacturing this impeller as a resin product, the intermediate ring Since it is provided from the outer peripheral edge to the inner peripheral edge of the blade, it is difficult to mold the resin integrally, and like the impeller of the cross flow fan, the impeller is positioned in the direction of the rotation axis at the position of the intermediate ring. Since it is necessary to mold the resin by dividing it into a part on the end ring side and a part on the end plate side in the rotation axis direction, and joining these parts by ultrasonic welding, etc. There is a problem that it takes time and effort S

The problem of the present invention is that the impeller of a multiblade blower suppresses an increase in ventilation resistance when blown from the inside of the impeller to the outer peripheral side as much as possible, and can be integrally molded with a high-speed rotation. It is to realize.

[0004] An impeller of a multiblade blower that is the power of the first invention is an impeller of a multiblade blower that sucks gas from the direction of the rotation axis and blows out gas in a direction intersecting the rotation axis. A substantially circular end plate that rotates about the center, a plurality of blades, and one or more intermediate rings. The plurality of blades are annularly arranged on one or both sides of the end plate with the rotation axis as the center, and one end is provided on the outer periphery of the end plate. The intermediate ring is located at a position other than the end on the side opposite to the end plate of the plurality of blades! / And connects the outer peripheral edges of the blades so that they do not overlap with the blades when viewed from the rotation axis direction. It is formed as follows.

In the impeller of this multiblade blower, the intermediate ring force provided at a position other than the end on the side opposite to the end plate side of the plurality of blades so that the blades do not overlap with each other when viewed from the direction of the rotation axis. The outer peripheral edge of the impeller is formed so that the increase in ventilation resistance when blown from the inside of the impeller to the outer peripheral side and the resin impregnation of the entire impeller including the intermediate ring are possible, High speed rotation can be realized.

[0005] The impeller of the multi-blade fan that is powerful in the second invention is the impeller of the multi-blade fan that is powerful in the first invention. At least a part of the intermediate ring is at the end plate side end of the blade. From the position corresponding to 1/4 times the blade length from the end plate side end of the blade to the end plate side end toward the end of the blade opposite to the end plate side. It is formed so as to be included in the range up to the position corresponding to 3/4 times the length!

In the impeller of this multiblade blower, at least a part of the intermediate ring is directed from the end plate side end of the blade toward the end plate side of the blade toward the end end side of the blade from the end plate side of the blade. From the position corresponding to 1/4 times the blade length to the end, the blade length 3 Because it is formed so as to be included in a range up to a position corresponding to / 4 times the length, deformation of the vane wheel can be effectively suppressed.

[0006] The impeller of the multi-blade fan, which is the power of the third invention, is the blade wheel of the multi-blade fan, the power of the second invention, the intermediate ring is the end plate side end of the blade and the anti-end plate Two pitches are formed between the side edges, and the pitch between the intermediate rings is set within the range of 1/4 times the blade length to 3/4 times the blade length. Yes.

In the impeller of this multiblade blower, when an intermediate ring force is provided between the end plate side end and the opposite end plate side end of the blade, the pitch between the intermediate rings is 1 of the blade length.

Since it is set within the range of / 4 times the length to 3/4 times the blade length, the deformation of the impeller can be effectively suppressed.

[0007] The impeller of the multi-blade fan according to the fourth invention is the impeller of the multi-blade fan according to any of the first to third inventions, wherein the cross-sectional shape of the intermediate ring is the rotational axis. The length in the direction is approximately rectangular, which is more than 1/2 the length of protrusion from the outer periphery of the wing.

In the impeller of this multiblade blower, the cross-sectional shape of the intermediate ring is a substantially rectangular shape whose length in the rotation axis direction is 1/2 or more of the protruding length from the outer peripheral edge of the blade, which is sufficient for the intermediate ring. Since it has a thickness in the direction of the rotation axis, deformation of the impeller can be effectively suppressed.

[0008] The impeller of the multiblade fan according to the fifth invention is the impeller of the multiblade fan according to any of the first to third inventions, wherein the cross-sectional shape of the intermediate ring is substantially L It is a letter shape. In the impeller of this multiblade blower, the cross-sectional shape of the intermediate ring is substantially L-shaped, and the intermediate ring has a sufficient thickness in the direction of the rotation axis, which effectively suppresses the deformation of the impeller. S can.

[0009] The impeller of the multiblade fan according to the sixth invention is the impeller of the multiblade fan according to any of the first to third inventions, wherein the cross-sectional shape of the intermediate ring is substantially trapezoidal. Shape. In this impeller of a multiblade blower, the cross-sectional shape of the intermediate ring has a substantially trapezoidal shape, and the intermediate ring has a sufficient thickness in the direction of the rotation axis, so that it can effectively recognize the deformation of the impeller. That power S.

Brief Description of Drawings FIG. 1 is a radial cross-sectional view of an impeller of a multiblade blower that is effective in an embodiment of the present invention.

FIG. 2 is a radial cross-sectional view of an impeller of a multiblade fan and a shape of a mold corresponding to the cross-sectional view.

FIG. 3 is a plan view of an impeller of a multiblade fan and a shape of a mold corresponding to the plan view.

FIG. 4 is a radial sectional view of an impeller of a multiblade fan according to Modification 1.

FIG. 5 is a radial cross-sectional view of an impeller of a multiblade fan according to Modification 2, showing the vicinity of an intermediate ring.

FIG. 6 is a radial cross-sectional view of an impeller of a multiblade fan according to Modification 2, showing the vicinity of an intermediate ring.

FIG. 7 is a radial cross-sectional view of an impeller of a multi-blade blower that focuses on another embodiment.

Explanation of symbols

[0011] 1, 101 Impeller of multi-blade fan

11 End plate

12 wings

14, 15 Intermediate ring

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of an impeller of a multiblade blower according to the present invention will be described based on the drawings.

(1) Configuration of impeller of multiblade fan

FIG. 1 shows an impeller 1 of a multiblade blower according to an embodiment of the present invention. Here, FIG. 1 is a radial sectional view of the impeller 1 of the multiblade fan.

Impeller 1 is an impeller of a double-suction type multi-blade fan that sucks gas from both sides of the rotation axis and blows gas in a direction crossing the rotation axis, and is driven to rotate by motor 2. . Here, OO in the figure is the rotational axis of the impeller 1 and the motor 2. As will be described later, the impeller 1 is a resin product that is integrally molded using a mold, and mainly includes an end plate 11, a plurality of blades 12, a undling ring 13, and one or more intermediate rings 14. It is equipped with. The end plate 11 is a substantially circular portion that rotates about the rotation shaft 3 of the motor 2, and a center hole 11 a to which the rotation shaft 3 is coupled is formed.

The plurality of blades 12 are annularly arranged on both surfaces of the end plate 11 with the rotation shaft 3 as the center, and each end is disposed on the outer periphery of the end plate 11 and extends without twisting toward both sides in the rotation axis direction. /!

The end ring 13 is an annular portion connecting the outer peripheral edges of the opposite end plate 11 side ends of the blades 12 at the position of the other end of the blade (that is, the opposite end plate 11 side end). It is arranged on both sides of the plate 11 in the rotation axis direction. The end ring 13 is formed so as not to overlap the plurality of blades 12 when viewed from the rotation axis direction.

The intermediate ring 14 is connected to the outer peripheral edge of each blade 12 so that it does not overlap with the plurality of blades 12 when viewed from the rotational axis direction at a position other than the end on the side opposite to the end plate 11 of the plurality of blades 12. In the present embodiment, the annular portion is disposed on both sides of the end plate 11 in the rotation axis direction. Further, at least a part of each intermediate ring 14 is directed from the end plate 11 side end of the blade 12 toward the anti-end plate 11 side end of the blade 12 from the end plate 11 side end of the blade 12 as a reference. A position corresponding to a quarter length of the blade length L1 from a position corresponding to a quarter length of the blade length to the side edge (hereinafter referred to as the blade length L1). It is formed to be included in the range up to. Further, the cross-sectional shape of each intermediate ring 14 is a substantially rectangular shape in which the length L2 in the rotation axis direction is 1/2 or more of the protruding length W from the outer peripheral edge of the blade 12. In the present embodiment, each intermediate ring 14 is approximately 1/2 times the blade length L1 from the end 12 side end of the blade 12 toward the opposite end plate 11 side end of the blade 12. The length L 2 in the direction of the rotation axis has a substantially rectangular (that is, substantially square) cross-sectional shape having a length substantially the same as the protruding length W.

[0014] (2) Molding of impeller of multiblade fan

Next, molding of the impeller 1 of the multiblade fan according to the present embodiment will be described with reference to FIGS. Here, FIG. 2 is a diagram showing the radial cross-sectional view of the impeller 1 of the multiblade fan and the shapes of the molds 4, 5, 6, and 7 corresponding to the cross-sectional view. FIG. 3 is a plan view of the bladed wheel 1 of the multiblade fan and the shapes of the molds 4, 6, and 7 corresponding to the plan view. The impeller 1 is formed by integrally molding resin using two pairs of molds 4 and 5 and molds 6 and 7.

When the molds 4 and 5 are aligned in the rotation axis direction, the end plate forming portion 4a of the mold 4 and the end plate forming portion 5a of the mold 5 include the end plate 11 including the center hole 11a (however, the radial direction The outer rim forming portions 4c and 5c of the dies 4 and 5 are formed by forming the wing forming portions 4b and 5b of the dies 4 and 5 into the wing 12 (excluding the outer peripheral edge in the radial direction). However, the illustration of the outer peripheral edge forming portion 5c is omitted) forms the radial inner peripheral edge of the end ring 13 and the radial inner peripheral edge of the intermediate ring 14.

In addition, when the molds 6 and 7 are aligned in a direction orthogonal to the rotation axis O—O (ie, in the radial direction), the outer peripheral edge forming portions 6 a and 7 a are in the radial outer peripheral edge of the end plate 11. And the outer peripheral edge of the blade 12 in the radial direction, the end ring forming parts 6b and 7b form the end ring 13 (excluding the inner peripheral edge of the end ring 13 in the radial direction), and the intermediate ring forming parts 6c and 7c are in the middle Form a ring 14 (except for the radially inner edge of the intermediate ring 14).

Thus, the impeller 1 of the multiblade fan of the present embodiment can be integrally molded with resin by removing the dies 4 and 5 in the rotational axis direction and dies 6 and 7 in the radial direction. is there.

(3) Features of the impeller of the multiblade fan of this embodiment

The impeller 1 of the multiblade fan of the present embodiment has the following characteristics.

(A)

In the impeller 1 of the multiblade blower of the present embodiment, the intermediate ring 14 provided at a position other than the side end of the anti-end plate 11 of the plurality of blades 12 overlaps the plurality of blades 12 when viewed from the rotation axis direction. It is formed so that the outer peripheral edge of each wing 12 is connected. Therefore, when the airflow F (see FIG. 1) flowing into the impeller 1 from the axially opposite end plate 11 side of the impeller 1 is blown out from the inside of the impeller 1 to the outer peripheral side, the conventional intermediate ring In contrast, the intermediate ring 14 can suppress an increase in draft resistance. Moreover, the resin impregnation of the entire impeller 1 including the intermediate ring 14 is possible.

[0016] Thus, in the impeller 1 of the multiblade blower of the present embodiment, the impeller 1 including the suppression of the increase in ventilation resistance when blown from the inside of the impeller 1 to the outer peripheral side and the intermediate ring 14 is included. The entire High-speed rotation can be realized while making the resin integral molding possible.

(B)

In the impeller 1 of the multiblade fan according to the present embodiment, at least a part of the intermediate ring 14 is directed toward the opposite end plate 11 side end of the blade 12 with respect to the end plate 11 side end of the blade 12. From the position corresponding to 1/4 of the blade length L1 from the end plate 11 side end to the end plate 11 side end of the end plate to the position corresponding to 3/4 times the blade length L1 Since it is formed so as to be included in the range, the deformation of the impeller 1 can be effectively suppressed.

(C)

In the impeller 1 of the multiblade blower of the present embodiment, the cross-sectional shape of the intermediate ring 14 is a substantially rectangular shape in which the length L2 in the rotation axis direction is 1/2 or more of the projection length W from the outer peripheral edge of the blade 12. Since the intermediate ring 14 has a sufficient thickness in the rotational axis direction, deformation of the impeller 1 can be effectively suppressed.

(4) Modification 1

In the above-described embodiment, one intermediate ring 14 is formed between the end plate 11 side end of the wing 12 and the opposite end plate 11 side end of the wing 12! /, But a plurality of intermediate rings are formed. In addition, the amount of deformation of the impeller caused by centrifugal force may be further reduced.

For example, as shown in FIG. 4, two intermediate rings 15 can be formed between an end plate 11 side end of the blade 12 and an end plate 11 side end of the blade 12. Further, in this case, for each intermediate ring 15, as in the above-described embodiment, at least a part of the blades 12 of each intermediate ring 15 is provided so that deformation of the impeller 1 can be effectively suppressed. The blade length from the end plate 11 side end of the blade 12 to the anti-end plate 11 side end is 1/4 times longer than the end plate 11 side end of the blade 12 toward the anti-end plate 11 side end of the blade 12 It is desirable to form it within the range from the position corresponding to the height to the position corresponding to 3/4 times the blade length L1. Also, the pitch P between the two intermediate rings 15 formed between the end 12 of the blade 12 on the side of the end plate 11 and the end of the blade 12 on the side of the end plate 11 is 1/4 times the length L1 of the blade. The deformation of the impeller 1 can be more effectively suppressed by setting it within the range of 3/4 times the blade length. [0018] Also, in the impeller 1 of the multiblade blower of this modification, it corresponds to the formation position of the intermediate ring 15 in the molds (molds 6 and 7 shown in FIGS. 2 and 3) that are pulled out in the radial direction. By providing the intermediate ring forming portion in this way, resin impregnation of the entire impeller 1 is possible as in the above-described embodiment.

(5) Modification 2

In the above-described embodiment and Modification 1, the cross-sectional shape of the intermediate rings 14 and 15 is substantially rectangular. However, when the impeller is integrally molded with resin, a mold (the mold shown in FIGS. 2 and 3) is used. If it is difficult to remove the dies 6 and 7) in the radial direction, intermediate rings with various cross-sectional shapes can be used.

For example, as shown in FIG. 5, the cross-sectional shape of the intermediate rings 14 and 15 may be substantially L-shaped so as to have a sufficient thickness in the rotational axis direction. Further, in this case, the intermediate rings 14 and 15 have portions 14a and 15a extending in the rotation axis direction, and portions 14b and 15b projecting toward the outer peripheral side in the radial direction from the portions 14a and 15a. The force that passes through the impeller 1 It is desirable to form the parts 14b and 15b so that they are placed on the end plate 11 side so that the airflow F can flow smoothly.

In addition, as shown in FIG. 6, the cross-sectional shape of the intermediate rings 14 and 15 may be substantially trapezoidal so as to have a sufficient thickness in the direction of the rotation axis. Further, in this case, as shown in FIG. 6, the intermediate rings 14 and 15 are directed to the radially outer peripheral side of the blade 12, and the force formed so that the thickness in the rotational axis direction decreases accordingly. In order to allow the air flow F passing through the impeller 1 to flow smoothly, the surface on the side opposite to the end ring 11 is inclined toward the end ring 11 side as it is directed toward the radially outer peripheral side of the blade 12. It is desirable to form.

(6) Other embodiments

As mentioned above, although embodiment of this invention and its modification were demonstrated based on drawing, specific structure is not restricted to these embodiment and its modification, the range which does not deviate from the summary of invention. Can be changed.

[0020] (A)

In the above-described embodiment and its modifications, the present invention is applied to the impeller of a single-suction type multi-blade fan, which explains an example in which the present invention is applied to the impeller of a double-suction type multi-blade fan The invention may be applied.

For example, as shown in FIG. 7, in an impeller 101 of a multiblade blower that includes an end plate 11, a plurality of blades 12, and an end ring 13, and is driven to rotate by a motor 2, the end plate 11 1 By forming one intermediate ring 14 similar to that of the above-described embodiment between the rotation axis directions of the blade 12 and the end ring 13, the blade 12 can be connected to the blade 12 from the end plate 11 side end similarly to the above-described embodiment. A configuration in which one intermediate ring 14 is formed between the end plate 11 and the end of the end plate 11 is possible.

In addition, in the impeller 101 of the present embodiment, as in the above-described modification 1 in which only one intermediate ring 14 is formed, the end of the blade 12 opposite the end of the blade 12 is counteracted. Two intermediate rings 15 are formed between the end plate 11 and the end plate 11 side end, or in the same manner as in the above-described modified example 2, the blade 12 end plate 11 side end to the blade 12 counter end plate 11 side end In the meantime, it is possible to create a structure in which L-shaped or trapezoidal intermediate rings 14 and 15 are formed.

Furthermore, since one end of the plurality of blades 12 is provided only on one side of the end plate 11, the specific shape of the mold is different from the above-described embodiment and its modifications. In the impeller 101 of the multi-blade fan of the configuration, as in the above-described embodiment and its modified examples, the impeller including the intermediate ring is used by using the die that is extracted in the rotational axis direction and the die that is extracted in the radial direction. The resin 101 can be integrally molded.

[0022] (B)

In the above-described embodiment and its modification, each of the plurality of blades 12 is provided with the end plate 11 and the other end is connected with the end ring 13, and the intermediate rings 14 and 15 are provided. However, the present invention is not limited to this, and the intermediate rings 14 and 15 may be provided in a configuration in which each other end is not connected by the end ring 13.

Industrial applicability

[0023] If the present invention is used, in an impeller of a multiblade blower, an increase in ventilation resistance when blown from the inside of the impeller to the outer peripheral side is suppressed as much as possible, and resin integral molding is possible. High speed rotation can be realized.

Claims

The scope of the claims

An impeller of a multi-blade blower that sucks gas from a rotation axis direction and blows out gas in a direction intersecting the rotation axis,

A substantially circular end plate (11) rotating about the rotation axis;

A plurality of blades (12) disposed on one or both sides of the end plate in an annular shape around the rotation axis, each end being provided on the outer periphery of the end plate;

At a position other than the opposite end plate side edge of the plurality of blades, the outer peripheral edges of the blades are connected so as not to overlap the plurality of blades when viewed from the rotational axis direction. One or more intermediate rings (14, 15) formed as follows:

Multi-blade fan impeller equipped with (1, 101).

At least a part of the intermediate ring (14, 15) is directed toward the opposite end plate side end of the blade (12) with reference to the end plate side end of the blade (12). From a position corresponding to 1/4 times the blade length (L1) from the end plate side edge to the opposite end plate side edge to a position corresponding to 3/4 times the blade length The impeller (1, 101) of the multiblade fan according to claim 1, wherein the impeller (1, 101) is formed to be included in a range.

Yes

Two intermediate rings (14, 15) are formed between the end plate side end and the end plate side end of the wing (12),

The pitch (P) between the intermediate rings is set within a range of 1/4 times the blade length (L1) to 3/4 times the blade length,

The impeller (1, 101) of the multiblade fan according to claim 2.

The cross-sectional shape of the intermediate ring (14, 15) is a substantially rectangular shape in which the length (L2) in the rotation axis direction is 1/2 or more of the protruding length (W) from the outer peripheral edge of the wing (12). The impeller (1, 101) of the multiblade blower according to any one of claims 1 to 3, wherein the impeller (1, 101) is in the shape of a blade.

The impeller (1, 101) of the multiblade blower according to any one of claims 1 to 3, wherein a cross-sectional shape of the intermediate ring (14, 15) is substantially L-shaped.

The impeller (1, 101) of the multiblade fan according to any one of claims 1 to 3, wherein a cross-sectional shape of the intermediate ring (14, 15) is a substantially trapezoidal shape.