CN110500316B - Impeller for fan - Google Patents

Abstract

The invention aims to provide an impeller which can prolong the service life of a molding die of the impeller for a fan. An impeller in which a plurality of blade members are formed in a cylindrical shape at random intervals on a disc-shaped member, wherein the width of a reference blade as a reference is narrowed in the blade members of the assembly, fitting grooves for fitting the tips of the blade members are formed in the same number as the number of the blade members on the surface opposite to the side on which the blade members of the disc-shaped member are formed, and the fitting grooves for fitting the reference blade have the same length as the width of the reference blade, thereby preventing the insertion of other blades.

Description

Impeller for fan

Technical Field

The present invention relates to an impeller used in a cross flow fan (cross flow fan) or the like.

Background

The impeller for a crossflow fan includes a plurality of blades (blade members) provided around the same axis line with a certain gap therebetween, and rotates around the rotation axis, thereby quietly supplying laminar air over a wide range. And is used in various devices such as an air supply system (or an air supply portion) of an air conditioner.

The blade member of the fan impeller is a member (hereinafter referred to as "assembly") formed integrally by arranging the blade members in a cylindrical shape at equal intervals on a disc-shaped member, and is manufactured by connecting a plurality of members by ultrasonic welding or the like. However, in order to reduce noise during operation, a random arrangement of the blade members at unequal intervals is used. In this case, the disk-shaped member is provided with the same number of fitting grooves for connecting the other modules on the side opposite to the side where the blade member is not formed. The fitting grooves are formed at the same pitch as the blade members.

The following describes the conventional art and the problems associated therewith with reference to fig. 8 to 9. Fig. 8 is an explanatory view of a reference blade of a related art assembly, and fig. 9 is an explanatory view of a portion of a mold for molding the related art assembly, in which the reference blade is molded.

When the components are connected by ultrasonic welding, the components do not need to be accurately connected. Therefore, in order to prevent erroneous assembly (erroneous welding), the reference blade 499 is provided with a notch K at the tip end thereof. The length of the fitting groove 899 of the fitting reference blade 499 is the length of the front end portion of the notch. It is a common technique for those skilled in the art to provide notches at the leading end of the reference blade when the blade members are provided at random intervals in order to reduce noise.

When the blade members 49, 499 are thus provided at random intervals, it is necessary to recognize the position of the reference blade 499 in order to prevent erroneous assembly. Therefore, when the notch K is provided at the tip end of the reference blade 499, the mold needs to be provided with the protrusion T to form the notch K. When a plurality of components are molded, burrs B (attachments) are formed on the projections T for forming the notches K, the mold is gradually worn, and stripes L and the like are formed on the surface of the blade member 499. Such a phenomenon becomes more serious by reducing the average thickness of the blade members in order to achieve weight reduction of the impeller. If such a phenomenon occurs in the reference blade, the mold needs to be repaired.

Disclosure of Invention

The present invention has been made to overcome the disadvantages of the prior art and an object of the present invention is to provide an impeller for a fan having a reference blade shape that improves the life of a mold for molding the impeller for a fan.

Means for solving the problems

In order to achieve the above object, a fan impeller according to a first aspect of the present invention has the following features.

An impeller for a fan, wherein a plurality of blades are formed in a cylindrical shape at random intervals on a disc-shaped member to form a module, and the blade members of the module are joined to the disc-shaped member of another module;

in the blade member of the above assembly, the reference blade as a reference is narrower in width than the other blade members;

a fitting groove for fitting the tip of the blade member is formed in the same number as the number of the blade members on the surface of the disc-shaped member opposite to the side on which the blade member is formed;

the fitting groove into which the reference blade is fitted has the same shape as the cross section of the reference blade, and prevents the insertion of other blade members.

In the fan impeller according to the first aspect of the present invention, the reference blades of the assembly have a linear shape having a width smaller than the width of the other blade members. In the prior art, the reference blade has a notch at its tip, and the forming mold also has a projection corresponding to the notch. When the module is molded a plurality of times, the adhered matter adheres to the edge of the protrusion to form a burr state. This burr causes a streak-shaped scratch on the surface of the reference blade. If the scratch becomes conspicuous, the performance of the fan impeller is affected. The fan impeller according to the first aspect of the present invention can solve the above problems.

The fan impeller according to the second aspect of the present invention is the fan impeller according to the first aspect of the present invention, and has the following features.

The width of the reference blade is narrowed by moving the position of the end of the fan impeller on the side of the rotation axis toward the outer periphery of the fan impeller.

According to the second aspect of the present invention, the width of the reference blade is reduced by changing the position of the rotation axis side while the position of the outer peripheral side of the fan impeller is kept constant, thereby achieving the effect of the first aspect of the present invention without reducing the air blowing performance (air volume) of the fan impeller.

The fan impeller according to the third aspect of the present invention is the fan impeller according to the first aspect of the present invention, and has the following features.

The width of the reference blade is increased by moving the position of the tip of the impeller on the rotation axis side toward the rotation axis side.

According to the third invention, the effects of the first and second inventions can be achieved.

The fan impeller according to a fourth aspect of the present invention is the fan impeller according to any of the first through third aspects of the present invention, and has the following features.

The reference blade is made to have the same width as that of the blade member other than the reference blade, and the blade member having a section thicker on the outer circumference side and/or the rotating shaft side of the impeller than that of the blade member other than the reference blade;

the fitting groove for fitting the reference blade has the same shape as the cross section of the reference blade, and prevents the insertion of other blade members.

According to the fourth invention, the effects of the first to third inventions can be achieved.

The fan impeller according to a fifth aspect of the present invention is the fan impeller according to any of the first through fourth aspects of the present invention, and has the following features.

The reference blade is made to have the same width as that of the blade members other than the reference blade, and the blade members of the cross section are made thinner on the outer peripheral side and/or the rotating shaft side of the impeller than the blade members other than the reference blade;

the fitting groove for fitting the reference blade has the same shape as the cross section of the reference blade, and prevents the insertion of other blade members.

According to the fifth invention, the effects of the first to third inventions can be achieved.

The fan impeller according to a sixth aspect of the present invention is the fan impeller according to any of the first through fifth aspects of the present invention, and has the following features.

Identification marks are provided on both sides of a fitting groove into which the reference blade is fitted.

According to the fan impeller of the sixth aspect of the invention, since the identification marks are provided on both sides of the fitting groove into which the reference blade is fitted, the fitting groove into which the reference blade is to be fitted can be easily identified. Therefore, the assembly work is easy, and the fan impeller manufacturing efficiency is improved.

Drawings

Fig. 1 is an explanatory view of an impeller for a fan of the present invention;

fig. 2(a) to 2(c) are explanatory views of components of an impeller for a fan according to the present invention;

fig. 3 is an explanatory view of a fitting groove of a reference blade in embodiment 1 of the present invention;

fig. 4 is an explanatory view of a fitting groove of a reference blade in example 2 of the present invention;

fig. 5 is an explanatory view of a fitting groove of a reference blade according to embodiment 3 of the present invention;

fig. 6 is an explanatory view of a fitting groove of a reference blade according to embodiment 4 of the present invention;

FIG. 7 is an explanatory diagram of an identification mark provided to a reference blade according to an embodiment of the present invention;

FIG. 8 is an illustration of a reference blade of a prior art assembly;

fig. 9 is an explanatory view of a portion of a forming reference blade of a forming die of a related-art assembly.

Description of the reference numerals

1: impeller wheel

2: assembly of impellers

3: disc-shaped member

4: blade component (blade)

41: blade member (embodiment 1)

42: blade member (embodiment 2)

43: blade member (embodiment 3)

44: blade member (embodiment 4)

411: reference blade (embodiment 1)

421: reference vane (embodiment 2)

431: reference blade (embodiment 3)

441: reference blade (embodiment 4)

5: end plate (hub side disc shape fixed disk)

6: shaft part

7: hub portion

8: tabling groove

81: embedding groove (embodiment 1)

82: embedding groove (embodiment 2)

83: embedding groove (embodiment 3)

84: embedding groove (embodiment 4)

811: reference blade fitting groove (example 1)

821: reference blade fitting groove (example 2)

831: reference vane fitting groove (example 3)

841: reference vane fitting groove (example 4)

C: hollow (reference blade forming part)

K: gap(s)

L: stripe

M: mold part

S: identification mark

T: die projection

B: burr (burr)

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the present embodiment, the "impeller" refers to a "fan impeller".

Fig. 1 is an explanatory view of an impeller for a fan of the present invention; fig. 2(a) to 2(c) are explanatory views of components of the fan impeller according to the present invention; fig. 3 is an explanatory view of a fitting groove of a reference vane according to embodiment 1 of the present invention; fig. 4 is an explanatory view of a fitting groove of a reference blade in example 2 of the present invention; fig. 5 is an explanatory view of a fitting groove of a reference vane according to embodiment 3 of the present invention; fig. 6 is an explanatory view of a fitting groove of a reference vane according to embodiment 4 of the present invention; fig. 7 is an explanatory diagram of the identification mark provided on the reference blade according to the embodiment of the present invention.

< example >

<1> impeller structure of the present invention

As shown in fig. 1, an impeller 1 of example 1 is composed of a plurality of impeller assemblies 2 shown in fig. 2 a to 2 c, an end plate (hub-side disk-shaped fixed plate) 5, a shaft portion 6, and a hub portion 7. The shaft portion 6 is attached to the disc-shaped member 3 of the unit 2 at one end of the impeller 1. An end plate (hub-side disk-shaped fixed plate) 5 is attached to the blade 4 side of the assembly at the hub-side end of the impeller 1. The boss portion 7 is provided on the end plate 5.

<2> Structure of blade Member (Assembly 2)

As shown in fig. 2(a) to 2(c), the assembly 2 of the impeller 1 is composed of a disc-shaped member 3 and a blade member 4. The material can be synthetic resin such AS AS resin, ABS resin, PS resin and PP resin. The resin described here is an example, and any synthetic resin that can impart a certain strength to a molded article may be used as long as it is a synthetic resin that is generally used. In addition, the end plate 5 may be formed of the same material. The module 2, the end plate 5, and the shaft-side disk-shaped fixed disk 3 are each formed by extrusion molding, pressing, extrusion, or the like. The components 2 can be bonded by an adhesive method such as ultrasonic welding.

To reduce noise, the blade members of the assembly 2 are not equally spaced, but are arranged at random intervals on the disc-shaped member 3. In order to connect the components by ultrasonic welding or the like, fitting grooves 8 for fitting the tips of the blade members are formed in the same number as the blade members on the side opposite to the side where the blade members of the disc-shaped member 3 are formed. Since the blade members are arranged at random intervals, the fitting grooves may be arranged at the same intervals as the blade members. Although the blade members are arranged at random pitches, if the difference in the intervals is too small, the blade members may be deformed and fitted to each other because the average thickness of the blade members is about 0.6mm to reduce the weight. If this occurs, the blade member is not positioned at the correct position, and therefore, the blade is damaged during ultrasonic welding, which may affect the noise characteristics of the fan. Therefore, the reference blade is provided for accurate assembly of the blade member. Embodiments of the reference blade will be described in detail below, and it is desirable to prevent erroneous assembly by the reference blade (411 to 441 of fig. 3 to 7) and changing the shapes of other blade parts. Therefore, the fitting groove is also the same as the fitting groove (811 to 841 in fig. 3 to 7) in which the reference blade is fitted, but need only be changed.

In the conventional technique, the blade member has a notch at its tip end to distinguish it from other blade members. However, since the provision of the notch at the tip end of the reference blade reduces the life of the molding die, in the present invention, the tip end portion of the reference blade has a linear shape instead of the notch for identification.

<3> specific examples

Next, a method of preventing erroneous assembly by the reference blade according to the present embodiment will be described, but the present invention is not limited to the following embodiments.

<3-1> example 1

Fig. 3 is an explanatory view of the shapes of the reference blade and the fitting groove in embodiment 1. As shown in the figure, the reference blade 411 is only narrowed in width (length) as compared with the other blade members 41. The fitting groove 811 fitted into the dummy blade 411 has the same shape as the cross-sectional shape of the reference blade 411. Thereby preventing erroneous assembly. The reference vane 411 has the same width as the outer peripheral positions of the other plural vanes 41, and is narrowed by moving the position on the rotation axis side of the impeller 1 toward the outer peripheral side. Therefore, even if the width (length) of the reference blade is reduced, the blowing performance (air volume) of the fan is not reduced.

The width (length) of the reference blade 411 in the present embodiment is narrower than the other blade members 41, but if the width is too narrow, the strength of the reference blade 411 is lowered, which is not preferable. Therefore, as shown in fig. 7, in order to identify the fitting groove 811 fitted to the reference blade 411, identification recesses S and the like are provided on both sides of the fitting groove 811. In order to easily recognize the position of the fitting groove 811 of the fitting reference vane 411, a concave portion S for recognition is provided, and the like, so that it is easy to distinguish from other fitting grooves 81 during the assembly work, thereby achieving an effect of improving the manufacturing efficiency of the impeller 1.

<3-2> example 2

Fig. 4 is an explanatory view of the shapes of the reference vane and the fitting groove in embodiment 2. As shown in the figure, the reference blade 421 is longer in width (length) toward the rotation axis than the other blade members 42. The fitting groove 821 into which the reference blade 421 is fitted has the same shape as the cross section of the reference blade, and prevents erroneous assembly. In this case, the cross-sectional thickness of the reference blade 421 may be increased on the rotation axis side as shown in fig. 4 or may be the same as that of the other blade members 42. In the present embodiment, in order to distinguish the fitting groove 821 to be fitted to the reference blade 421 from the other fitting grooves 82, it is preferable to provide identification recesses S on both sides of the fitting groove.

<3-3> example 3

Fig. 5 is an explanatory view of the shapes of the reference blade and the fitting groove in embodiment 3. As shown in the figure, the width (length) of the reference vane 431 is the same as that of the other vane members 43, and the thickness of the impeller 1 on the side of the rotation axis is increased in the sectional shape. The fitting groove 831 into which the reference vane 431 is fitted has the same shape as the cross section of the reference vane. This prevents erroneous assembly of the reference vane 431 into the fitting groove 83 of the other vane member 43. In this embodiment, the thickness of the reference vane 431 on the outer peripheral side of the impeller 1 in cross section may be increased, or both the outer peripheral side and the rotation axis side of the impeller 1 may be increased. In the present embodiment, in order to identify the fitting groove 831 fitted to the reference vane 431, it is preferable to provide identification recesses S on both sides of the fitting groove.

<3-4> example 4

Fig. 6 is an explanatory diagram of the shapes of the reference blade 441 and the fitting groove 84 in example 4. As shown in the figure, the reference blade 441 has the same width (length) as the other blade members 4, and the outer peripheral side and the rotation axis side are thinned in the sectional shape. In addition, the thickness of the cross section of the reference vane may be reduced to either the outer peripheral side of the impeller or the rotation shaft side. The fitting groove 841 into which the reference blade 441 is fitted has the same shape as the reference blade. This prevents erroneous assembly of the reference blade 441 into the fitting groove 84 of the other blade member 4. In the present embodiment, in order to identify the fitting groove 841 to be fitted to the reference blade 441, it is preferable to provide identification recesses S on both sides of the fitting groove.

Claims (8)

1. An impeller for a fan, comprising a disk-shaped member, a plurality of blades formed in a cylindrical shape at random intervals to form a unit, and the blade members of the unit being joined to the disk-shaped member of another unit, wherein:

in the blade member of the above assembly, the reference blade as a reference has a width or thickness different from that of the other blade members;

forming a plurality of fitting grooves for fitting the tips of the blade members, the number of the fitting grooves being equal to the number of the blade members, on the surface of the disc-shaped member opposite to the surface on which the blade members are formed;

the fitting groove into which the reference blade is fitted has the same shape as the cross section of the reference blade, and prevents the insertion of other blade members.

2. The impeller for the fan as claimed in claim 1, wherein:

the reference blade is narrowed in width by moving the position of the end of the impeller on the rotation axis side toward the outer periphery side of the impeller.

3. The impeller for the fan as claimed in claim 1, wherein:

the reference blade is formed to have a width that is increased by moving the position of the end of the impeller on the rotation axis side toward the rotation axis side of the impeller.

4. The impeller for the fan as claimed in any one of claims 1 to 3, wherein:

the reference blade is made to have the same width as that of the blade members other than the reference blade, and the blade members of the cross section are made thicker on the outer circumference side and/or the rotating shaft side of the impeller than the blade members other than the reference blade;

the fitting groove for fitting the reference blade has the same shape as the cross section of the reference blade, and prevents the insertion of other blade members.

5. The impeller for the fan as claimed in claim 1 or 2, wherein:

the reference blade is made to have the same width as that of the blade member other than the reference blade, and the blade member having a cross section thinner on the outer peripheral side and/or the rotating shaft side of the impeller than the blade member other than the reference blade;

the fitting groove for fitting the reference blade has the same shape as the cross section of the reference blade, and prevents the insertion of other blade members.

6. The impeller for the fan according to any one of claims 1 to 3, wherein:

identification marks are provided on both sides of a fitting groove into which the reference blade is fitted.

7. The impeller for the fan according to claim 4, wherein:

identification marks are provided on both sides of a fitting groove into which the reference blade is fitted.

8. The impeller for the fan as claimed in claim 5, wherein:

identification marks are provided on both sides of a fitting groove into which the reference blade is fitted.

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