WO2015046110A1

WO2015046110A1 - Bladed wheel for fan

Info

Publication number: WO2015046110A1
Application number: PCT/JP2014/075010
Authority: WO
Inventors: 加藤貴久; 永田武司
Original assignee: 日清紡メカトロニクス株式会社
Priority date: 2013-09-30
Filing date: 2014-09-22
Publication date: 2015-04-02
Also published as: CN105793575A; KR20160062076A; JP6431663B2; JP2015068269A

Abstract

The purpose of the present invention is to provide a low noise, inexpensive bladed wheel that removes or reduces blade-passing frequency noise. A bladed wheel for a fan, which is formed by creating a constituent unit by forming a plurality of blade members in a cylinder on a disc-shaped mounting plate and connecting the blade members of the constituent unit to the disc-shaped mounting plate of another constituent unit, is configured so that: fitting grooves into which the blade member tips fit are provided, in a number equal to the number of blade members, on the face opposite the side where the blade members of the disc-shaped mounting plate are formed; the position of the fitting groove is shifted with respect to the position of the blade member on the disk-shaped mounting plate; and each constituent unit is connected by fitting the blade member tip into the fitting groove.

Description

Blower impeller

The present invention relates to an impeller used for a blower such as a cross-flow blower.

Demand for impellers with low noise and vibration has been increasing in order to reduce the weight of impellers and improve the performance of blowers due to recent environmental issues and resource conservation efforts.

First, the configuration of a conventional impeller will be described. As shown in FIG. 11, the conventional impeller 200 includes a plurality of impeller constituent units 202, a boss-side disk-shaped fixing plate 205, a shaft portion 206, and a boss portion 207. The constituent unit 202 includes a disc-like member 203 and a blade 204. The shaft portion 206 is attached to the disk-like member 203 of the constituent unit 202 at one end of the impeller 200. The boss side disk-shaped fixing plate 205 is attached to the blade member side of the constituent unit at the other end of the impeller 200. The boss portion 207 is provided on the boss side disk-shaped fixing plate 205. Hereinafter, this impeller is referred to as a conventional product.

In order to realize the low noise of such a conventional impeller, it is particularly necessary to remove or reduce the Nz sound. The Nz sound is a peak sound generated according to the number of blades and the number of rotations of an impeller for a blower. When the Nz sound is generated, it is easy to catch the ear because it has a specific frequency peak. In order to reduce this Nz noise, the following impeller is proposed in Patent Document 1.

The impeller described in Patent Document 1 will be described. The blades of the impeller 300 have a shape as shown in FIG. 12, and a plurality of blades 304 are arranged in the configuration unit 302 in a cylindrical shape. An impeller in which one end of a blade 304 integrally fixed to a disk-shaped fixing plate 303 of the constituent unit and the other end are integrally formed with a twisted blade, and a plurality of such constituent units are connected. Has been proposed. However, the impeller of Patent Document 1 has a complicated process and mold for molding a constituent unit including the impeller, which increases the cost of the impeller. Hereinafter, this impeller is referred to as an existing product.

JP 08-049889

The present invention has been made in view of the above circumstances, and an object thereof is to provide an inexpensive impeller that is low in noise and that eliminates or reduces Nz noise.

In order to solve the above-described problem, the impeller according to the first invention is formed by forming a plurality of blade members into a disk-shaped member in a cylindrical shape to form a structural unit, and connecting the blade member of the structural unit to the disk member of another structural unit. An impeller of a blower formed by providing the same number of fitting grooves as the blade members on the surface of the disk-shaped fixing plate opposite to the side on which the blade members are formed, The position of the fitting groove is shifted with respect to the position of the blade member on the disk-shaped member, the tip of the blade member is fitted into the fitting groove, and each constituent unit is connected.

According to the impeller of the first invention, the following effects are manifested. A plurality of constituent units are formed, and the same number of fitting grooves as the blade members are provided on the opposite surface of the constituent unit of the disk-like member on which the blade members are formed, and the positions of the fitting grooves Is shifted with respect to the position of the blade member on the disk-shaped member, the blade member tip is fitted into the fitting groove, and the respective constituent units are connected. As a result, the mold for molding the impeller is significantly simpler than the mold for manufacturing the impeller of the existing technology. Therefore, the impeller of the present invention is much cheaper than the impeller of the existing technology.

In the impeller according to the first aspect of the invention, since the fitting groove of the disk-shaped member of the constituent unit is arranged to be shifted with respect to the tip position of the blade member, the tip of the blade member is twisted and inserted. Therefore, the material of the blade member (component unit) may be a material having flexibility that does not generate cracks even if deformation such as torsion is applied. For example, by using a synthetic resin having flexibility and setting the thickness dimension of the blade member to the existing technology level, the Nz sound can be suppressed to the same level as the existing technology.

The impeller of the second invention is the impeller of the first invention, wherein the impeller blade member is made of a composite material of synthetic resin and glass fiber, and the impeller blade member has an average thickness of 0.3 to 0.8 mm. Further, the glass fiber contained in the blade member is oriented in the plane of the surface of the blade member.

In the impeller of the second invention, the material of the blade member is a composite material, and the thickness of the blade member is reduced without causing a decrease in strength. On the other hand, the reduction of the Nz sound was disadvantageous because the thickness of the blade member was reduced. However, since the contents of the first invention are used, the level of the Nz sound can be made equal to the impeller of the existing technology. The mold for molding the impeller has a simple structure. Furthermore, the impeller is inexpensive.

According to the impeller of the second invention, the following effects are also exhibited. In the impeller of the second invention, the material of the blade member is a composite material of a synthetic resin material and glass fiber, and the average thickness of the blade member is reduced to 0.3 to 0.8 mm. For this reason, the glass fiber contained in a blade member is orientated in the surface of the surface of a blade member. By configuring the impeller with such a configuration, the weight can be reduced to half or less compared to the conventional product and the existing product. Even if the blade member is made thinner and lighter, the power for driving the impeller can be reduced without causing a decrease in the performance of the impeller. Further, since the thickness of the blade member is less than half that of the conventional material, the cost of material costs is also less than half. Moreover, the average thickness of the blade member of the present invention is reduced from 0.3 mm to 0.8 mm, and not only the weight reduction but also the glass fiber in the composite material is oriented in the surface of the blade member, and the strength of the blade member Can be further improved. Therefore, in order to express the effect of the present invention, even if the tip of the blade member is twisted into the fitting groove and fitted, there is no problem that the blade member is broken.

The impeller of the third invention is the resin composite material according to the second invention, wherein the material of the blade member is a composite material of synthetic resin material and glass fiber, and the glass fiber content is 10% to 40% by weight. It is characterized by that.

The impeller of the third invention is a composite material of synthetic resin material and glass fiber, and a resin composite material in which the glass fiber content is 10% to 40% by weight. Therefore, the effects of the second invention can be exhibited, and the following effects are exhibited. Even if the average thickness of the blade member of the impeller is reduced from 0.3 mm to 0.8 mm, the glass fiber can be arranged in the plane of the blade member, so that the strength of the blade member can be improved. .

In the impeller of the fourth invention according to the second or third invention, the material of the blade member is a composite material of a synthetic resin material and glass fiber, and the elastic modulus (E ′) in the surface direction of the blade member is 2. It is characterized by being 5 × 10 ⁹ Pa to 1.2 × 10 ¹⁰ Pa.

In the impeller of the fourth invention, the material of the blade member is a composite material of a synthetic resin material and glass fiber, and the elastic coefficient (E ′) in the surface surface direction of the blade member is 2.5 × 10 ⁹ Pa to 1.. A composite material of 2 × 10 ¹⁰ Pa resin material and glass fiber is used. Therefore, the effects of the second invention can be exhibited, and the following effects are exhibited. That is, the impeller of the present invention can be made into an impeller having a high elastic coefficient and easy to return (restorability) characteristics by thinning the blade member as compared with a case where the same composite material is thick. it can.

It is a front view of the impeller of the present invention. It is explanatory drawing of the structural unit and fitting groove | channel of the impeller of this invention. It is explanatory drawing of Embodiment 1 of the fitting groove of a structure unit. It is explanatory drawing of Embodiment 2 of the fitting groove of a structure unit. It is explanatory drawing of Embodiment 3 of the fitting groove of a structure unit. It is a comparison figure of the ventilation efficiency of the impeller of this invention, a conventional product, and the existing product. It is a comparison figure of the noise characteristic of the impeller of this invention, a conventional product, and the existing product. It is a noise spectrum figure of a conventional product. It is a noise spectrum figure of the impeller of this invention. FIG. 9 is a spectrum diagram in which the high spectrum portion of the conventional Nz sound of FIG. 8 is superimposed on FIG. 9. It is explanatory drawing of a conventional product. It is explanatory drawing of the existing goods (impeller of patent document 1).

An embodiment of the present invention will be described with reference to the drawings.
1 is a front view of an impeller of the present invention, FIG. 2 is an explanatory view of a constituent unit and a fitting groove of the impeller of the present invention, FIG. 3 is an explanatory view of Embodiment 1 of a fitting groove of the constituent unit, FIG. FIG. 5 is an explanatory diagram of the fitting groove of the constituent unit according to the second embodiment, FIG. 5 is an explanatory diagram of the fitting groove of the constituent unit according to the third embodiment, and FIG. FIG. 7 is a comparison diagram of noise characteristics of the impeller of the present invention, the conventional product and the existing product, FIG. 8 is a noise spectrum diagram of the conventional product, FIG. 9 is a noise spectrum diagram of the impeller of the present invention, and FIG. FIG. 9 is a spectrum diagram in which the high spectrum portion of the conventional Nz sound of FIG. 8 is superimposed, FIG. 11 is an explanatory diagram of a conventional product, and FIG. 12 is an explanatory diagram of an existing product (impeller of Patent Document 1).

<1> Structure of Impeller of the Present Invention The impeller 1 of FIG. 1 according to the present invention includes a plurality of impeller constituent units 2, a boss-side disk-shaped fixing plate 5, a shaft 6 and a boss 7. It is configured. The shaft portion 6 is attached to the disk-like member 3 of the constituent unit 2 at the end portion on one side of the impeller 1. The boss side disk-shaped fixing plate 5 is attached to the blade member side of the constituent unit at the other end of the impeller 1. The boss portion 7 is provided on the boss side disk-shaped fixing plate 5.

<2> Structure of Blade Member (Configuration Unit 2) The configuration unit 2 of the impeller 1 includes a disk-shaped member 3 and a blade member 4. As the material, AS resin, ABS resin or PP resin is used. It is also possible to use a composite material of these resins and glass fibers. The resins and the like described here are only examples, and any synthetic resin that provides a certain strength to a molded product as a commonly used synthetic resin can be used sufficiently. A composite material of the synthetic resin and glass fiber can also be used. The disk-shaped member 3 and the blade member 4 are integrally formed by injection molding, a pressing method, an extrusion method, or the like. Each component unit 2 can be connected by an adhesion method such as an ultrasonic welding method. The boss side disk-shaped fixing plate 5 can be joined to the blade member 4 of the constituent unit 2 at the boss side end of the impeller 1 by an adhesion method such as an ultrasonic welding method.

In the present invention, unlike the blade member of the component unit of the current product (FIG. 12), a plurality of component units having the shape of FIG. 2 are formed. That is, unlike the existing product in FIG. 12, the blade member 4 is straight with no twist or the like in the length direction. They are joined by an adhesion method such as ultrasonic welding as described above to form an impeller.

The blade member 4 of the component unit 2 of the impeller 1 is provided with a draft angle for molding. The thickness of the blade member 4 is 0.3 to 1.5 mm in average thickness. The thickness is preferably 0.3 to 0.8 mm, and more preferably 0.4 to 0.6 mm. If the average thickness of the blade member is less than 0.3 mm, the moldability by the molding method is deteriorated and there is a risk that a molding defect may occur on the tip side of the blade member. If the average thickness of the blade member is greater than 1.5 mm, the rigidity of the blade member increases, so that a large force is required to deform the blade member, and twisting or the like is applied to the fitting groove provided in the disk-like member described later. It may be difficult to fit.

<3> Material of Blade Member (Component Unit 2) The material of the component unit 2 of the impeller 1 and the boss side disk-shaped fixing plate 5 will be described. As a material, synthetic resin such as AS resin, ABS resin, or PP resin can be used. In the present invention, as will be described later, in order to deform and fit the tip of the blade member into the fitting groove provided in the disk-shaped fixing plate, it is necessary that the tip of the blade member has an average thickness with flexibility. is there.

Also, composite materials of these synthetic resins and glass fibers can be used. In this case, the average thickness of the blade member is preferably 0.3 to 0.8 mm, and more preferably 0.4 to 0.6 mm. If the average thickness of the blade member is less than 0.3 mm, the moldability by the molding method is deteriorated and there is a risk that a molding defect may occur on the tip side of the blade member. If the average thickness of the blade member is greater than 0.8 mm, the glass fiber in the blade member may not be oriented in the surface of the blade member and the elastic coefficient (E ′) of the blade member may be reduced. The elastic modulus (E ′) will be described later. When the composite material is used, the glass fiber content is preferably 10% to 40% by weight, and more preferably 10% to 30%. If the weight ratio of the glass fiber content exceeds 40% of the total, there is a risk that defective molding of the blade member of the constituent unit may occur. Moreover, if it is less than 10%, the strength of the blade member may be reduced.

In the impeller of the impeller of the present invention, the material of the impeller is a composite material of a resin material and glass fiber, and the elastic modulus (E ′) of the composite material is 2.5 × 10 ⁹ Pa to 1.2 ×. A composite material of 10 ¹⁰ Pa can be used. If the elastic modulus (E ′) of the composite material is less than 2.5 × 10 ⁹ Pa, there is a possibility that the effect of the low elastic modulus and easy return property (restorability) may not appear at all, and 1.2 × 10 ¹⁰ If it exceeds Pa, there is a risk that defective formation of the blade member of the constituent unit will occur and the product cannot be produced.
The elastic modulus (E ′) was measured with a viscoelasticity measuring instrument (RSA3 manufactured by TA Instruments) after preparing a test piece having a predetermined size from the molded blade member. The elastic modulus was measured at a heating rate of 7.2 ° C./min and a measurement frequency of 1 Hz. The elastic modulus was a measured value at 20 ° C.

The elastic modulus (E ′) of the composite material of the resin material and glass fiber used for the blade member of the impeller of the present invention is increased when the thickness of the blade member shown in FIG. 2 is reduced, and the thickness of the blade member is increased. When it is thicker, it tends to be lower. When the wall thickness is increased from 0.5 mm to 2 mm, the elastic modulus (E ′) is approximately halved.
Further, when the glass fiber content is increased, the elastic modulus (E ′) also tends to increase. Increasing the glass fiber content from 10% to 40% by weight increases the elastic modulus (E ′) by about 3 times.

<4> Configuration Unit Connection Method Next, a configuration unit connection method will be described. When connecting the constituent units shown in FIG. 2, a fitting groove 8 for fitting the tip of the blade member is formed on the side of the disk-like member where the blade member is not formed, corresponding to the blade member of the constituent unit to be connected. Provided. The tip of the blade member is fitted into the fitting groove and connected by an adhesive method such as ultrasonic welding to form an impeller. In the present invention, in order to improve the noise performance of the impeller, the shape of the fitting groove into which the blade member is fitted is devised. Hereinafter, an embodiment of the fitting groove 8 will be described with reference to FIGS. 3 to 5. As shown in FIG. 2 (c), a plurality of fitting grooves 8 are provided in the disk-like member 3 of the component unit 2, and one of them (M portion in the figure) will be described in detail. .

[Embodiment 1]
Embodiment 1 of the fitting groove will be described with reference to FIG. The fitting groove 8 in FIG. 3 has the same shape as the tip of the blade member 4 of the constituent unit, and the position of the tip of the blade member of the constituent unit is projected onto the disc-like member 3 at the position to be arranged on the disc-like member 3. The phase is shifted with respect to the position and shape. The way of shifting is as shown in FIGS. 3 (a) and 3 (b). In FIG. 3A and FIG. 3B, the broken line is a shape obtained by projecting the shape of the tip of the above-described blade member onto a disk-shaped member. The intersections of the broken blade shape and its center line are P1 and P2 in FIG. In FIG. 3B, it is set as Q1 and Q2. FIG. 3A shows a shape in which the fitting groove is shifted from the center line P1-P2 by the rotation angle θ in the right direction and the left direction (arrow direction) with P1 as the base point. The center line of the fitting groove shifted to the left is P1-P3, and the center line of the fitting groove shifted to the right is P1-P4. FIG. 3B shows a shape in which the fitting groove is shifted from the center line Q1-Q2 by the rotation angle θ in the right direction and the left direction (arrow direction) with Q1 as a base point. The center line of the fitting groove shifted to the left is Q1-Q3, and the center line of the fitting groove shifted to the right is Q1-Q4. The rotation angle θ is 1 to 15 degrees. Such a blade member 4 is fitted in the fitting groove 8 in a twisted state. Then, it joins by ultrasonic welding etc.

Here, if the rotation angle θ is less than 1 degree, there is a possibility that the effect of reducing the removal of Nz noise may be lost, and if it exceeds 15 degrees, the blade member may be excessively deformed and the impeller may not be molded.

[Embodiment 2]
Embodiment 2 of the fitting groove will be described with reference to FIG. The fitting groove 8 in FIG. 4 has the same shape as the tip of the blade member 4 of the constituent unit, and the position at which the fitting groove 8 is arranged on the disc-like member is the position where the shape of the tip of the blade member of the constituent unit is projected onto the disc-like member 3. And slightly shifted inward in the radial direction with respect to the shape. The way of shifting is as shown in FIG. In FIG. 4, the broken line is a shape obtained by projecting the shape of the tip of the blade member described above onto the disk-shaped fixing plate. The intersections of the broken vane-shaped center lines are R1 and R2. FIG. 4 shows a shape in which the fitting groove is shifted radially inward with respect to the center line R1-R2. The center line of the fitting groove is R3-R4. The amount of displacement of the fitting groove inward in the radial direction is 0.5 mm to 2 mm. Such a blade member is fitted into the fitting groove while being bent slightly in the radial direction. Then, it joins by ultrasonic welding etc.

Here, if the amount of shift is less than 0.5 mm, the effect of reducing the removal of Nz sound may be lost, and if it exceeds 2 mm, the blade member may be excessively deformed and the impeller may not be molded.

[Embodiment 3]
Embodiment 3 of the fitting groove will be described with reference to FIG. The fitting groove 8 in FIG. 5 has the same shape as the tip of the blade member 4 of the constituent unit, and the position at which the fitting groove 8 is arranged on the disc-like member is the position where the shape of the tip of the blade member of the constituent unit is projected onto the disc-like member 3. The shape is shifted in the direction of the center line of the shape projected onto the disk-shaped member 3 at the tip of the blade member with respect to the shape. The way of shifting is as shown in FIGS. 5 (a) and 5 (b). 5A and 5B, the broken line is a shape obtained by projecting the shape of the tip portion of the above-described blade member onto the disk-shaped member. The intersections of the broken blade shape and its center line are denoted by S1 and S2 in FIG. In FIG. 5B, T1 and T2. In FIG. 5A, the fitting groove is shifted in the outer peripheral direction of the impeller along the broken vane-shaped center line S1-S2. The center line of the fitting groove shifted in this direction is S3-S4, which is the same as S1-S2. In FIG. 5B, the fitting groove is shifted in the inner circumferential direction of the impeller along a broken vane-shaped center line T1-T2. The center line of the fitting groove shifted in this direction is T3-T4, which is the same as T1-T2. The shift amount of the fitting groove in the outer circumferential direction or inner circumferential direction of the blade member is 0.5 mm to 2 mm. Therefore, the blade member is fitted in the fitting groove in a state bent slightly along the center line of the shape obtained by projecting the shape of the tip of the blade member onto the disk-shaped member 3. Then, it joins by ultrasonic welding etc.

[Embodiment 4]
Embodiment 4 of the fitting groove 8 will be described. Although this embodiment is not shown, the fitting grooves of the first to third embodiments can be combined and used in combination.

<5> Examples of Impeller of the Present Invention Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to the following examples.

[Example 1]
In this example, the constituent unit and the boss-side disk-shaped fixing plate were made of a composite material of AS resin in which the glass fiber content was 20% by weight. The blade member of the constituent unit has the form shown in FIG. 2, the average thickness is 0.4 mm, the length is 79 mm, and the number is 35. The diameter of the constituent unit was 106 mm at the outermost part of the blade member 4. Such a structural unit was formed by injection molding using the above-mentioned material. Further, eight such constituent units and the boss side disk-shaped fixing plate 5 made of the same material as the constituent unit 2 were joined by an ultrasonic welding method to produce the impeller of FIG. The produced impeller had a total length of 635 mm, a diameter of 106 mm, and a total weight of 385 gr.

Further, the fitting groove 8 provided in the disk-shaped member in this example is the same as that in FIG. The rotation angle θ of the fitting groove with respect to the blade member of the disk-shaped member was 5 degrees.

[Example 2]
In this example, the fitting groove 8 provided in the disk-shaped member is the second embodiment, and the fitting groove of the disk-shaped member with respect to the blade member is disposed 1 mm inward in the radial direction. Otherwise, the impeller was manufactured in the same manner as in Example 1.

[Example 3]
In this example, the fitting groove provided in the disk-shaped member is the third embodiment, and the fitting groove with respect to the blade member of the disk-shaped fixing plate is the center of the broken blade shape according to FIG. It was shifted by 1 mm in the inner circumferential direction of the impeller along the line S1-S2. Otherwise, the impeller was manufactured in the same manner as in Example 1.

[Comparative Example 1]
The impeller of this comparative example is a conventional product (FIG. 11). The material is AS resin and the average thickness of the blades is about 1.8 mm. The wing member is not twisted with the fitting groove on the disk-shaped fixing plate, that is, the wing member 204 of the constituent unit 200 is not twisted and is inserted into the fitting groove and connected. Other than that produced the impeller of FIG. 11 like Example 1. FIG. The weight of the obtained impeller was 733 gr.

[Comparative Example 2]
The impeller of this comparative example is an existing product (FIG. 12). The blade member 304 of the constituent unit 302 shown in FIG. 12A was simulated to have the shape shown in FIG. Each blade was fixedly joined to the disk-shaped fixing plate using a jig so that the tip of each blade was twisted by 5 degrees with respect to the root of the disk-shaped fixing plate. The blade member 304 was connected and fixed to the disk-shaped fixing plate 303 in a state where it was twisted 5 degrees in the directions a and b in FIG. In FIG. 12C, the broken blade member indicates the blade member 204 in FIG. 11 (or the blade member 4 in FIG. 2). The material was AS resin, and the average thickness of the blades was about 1.8 mm. Other than that produced the impeller of FIG. 12 like the Example. The weight of the obtained impeller was 733 gr.

The following was tested and compared about the impeller produced in Example 1 to Example 3 and Comparative Example 1 to Comparative Example 2.
[1] Blowing efficiency About the impeller obtained in Example 1 to Example 3 and Comparative Example 1 to Comparative Example 2, the blowing efficiency was evaluated as follows. The impeller produced by the above method was incorporated into an air conditioner indoor unit, and the actual air conditioner was installed in the air flow measuring device, and the air flow rate and the power consumption required to drive the impeller were measured.
[2] Noise characteristics The noise characteristics of the impellers obtained in Examples 1 to 3 and Comparative Examples 1 to 2 were evaluated as follows. The impeller produced by the above method was incorporated into an air conditioner indoor unit, the actual air conditioner was installed in an air flow measuring device, and the air flow rate and the rotation speed of the impeller were measured. In addition, the actual air conditioner was installed in the noise measurement room in a wall-mounted state, and the noise level and the rotation speed of the impeller were measured. The relationship between the air flow rate at the same rotation speed and the noise value was graphed.
[3] Nz sound When measuring the noise characteristics of [2] above, the level of the Nz sound in the noise spectrum diagram was compared and evaluated.

<6> Performance Evaluation of Examples and Comparative Examples FIG. 6 shows the evaluation results of the blowing efficiency (power consumption). FIG. 6 compares the relationship between the air volume (m ³ / min) and the power consumption (W) for the impellers of the example and the comparative example. As shown in FIG. 6, the power consumption of the impeller of the present invention is reduced by about 5 to 6% when the air volume is 12 m ³ / min.

The evaluation results of the noise characteristics are shown in FIG. FIG. 7 compares the relationship between the air volume (m ³ / min) and the noise value (dB (A)) for the impellers of the example and the comparative example. From FIG. 7, it can be confirmed that the product of the present invention has the same performance as the conventional product and the existing product.

It was confirmed that the degree of Nz noise reduction was equivalent to the impeller of the present invention product and the existing product (FIG. 12). The degree of Nz noise reduction was compared with the impeller of the present invention product and the conventional product (FIG. 11).

FIG. 8 is a noise spectrum diagram of a conventional impeller. The portions indicated as “Nz sound” and “2Nz” in the figure indicate the strength (level) as the Nz sound. FIG. 9 is a noise spectrum diagram of the invention. The portions indicated as “Nz sound” and “2Nz” in the figure indicate the strength (level) as the Nz sound. FIG. 10 shows a noise spectrum diagram of the present invention product (FIG. 9) at a frequency of 194 Hz to 6100 Hz of FIG. 8 and FIG. A portion having a high level (level) is displayed with an x mark superimposed thereon. From FIG. 10, it was found that the product of the present invention has the Nz sound removed and reduced significantly compared to the conventional product.

1 impeller (product of the present invention)
2 Component unit of impeller 3 Disk-shaped member 4 Blade member 5 Boss side disk-shaped fixing plate 6 Shaft portion 7 Boss portion 8 Fitting groove 200 Conventional impeller (conventional product)
300 Impeller of current technology (current product)

Claims

A blade impeller of a blower formed by forming a plurality of blade members into a disk-shaped member in a cylindrical shape to form a structural unit, and connecting the blade member of the structural unit to the disk-shaped member of another structural unit,
On the surface opposite to the side on which the blade member of the disk-shaped member is formed, the same number of fitting grooves as the blade member are fitted to fit the blade member tip,
Shifting the position of the fitting groove with respect to the position of the blade member on the disk-shaped member,
The impeller characterized in that the tip of the blade member is fitted into the fitting groove, and each component unit is connected.
The material of the impeller blade member is a composite material of synthetic resin and glass fiber, and the average thickness of the impeller blade member is in the range of 0.3 to 0.8 mm, and the glass contained in the blade member 2. The impeller according to claim 1, wherein the fibers are oriented in the plane of the surface of the blade member.
3. The blade according to claim 2, wherein the material of the blade member is a composite material of a synthetic resin material and a glass fiber, and a resin composite material having a glass fiber content of 10% to 40% by weight. car.
The blade member is made of a composite material of synthetic resin and glass fiber, and the elastic modulus (E ′) in the surface direction of the blade member is 2.5 × 10 9 Pa to 1.2 × 10 10 Pa. The impeller according to claim 2 or claim 3, characterized by the above.