JP7359575B2 - Mixed flow impeller - Google Patents

Description

The present invention relates to a mixed flow impeller.

BACKGROUND ART A mixed flow impeller including an annular base and a plurality of blades provided on the base is conventionally known (see Patent Document 1).

In such a mixed flow type impeller, the balance of the mixed flow type impeller is adjusted by measuring the balance, and if the balance is unbalanced, a recess is formed in the outer peripheral part of the base.

Japanese Patent Application Publication No. 2009-133267

In the mixed flow type impeller as described above, markings for detecting the rotational phase may be made on the outer periphery of the base, and no recesses can be formed on the marked outer periphery of the base. Therefore, it was sometimes difficult to adjust the balance of the mixed flow impeller.

An example of an object of the present invention is to provide a mixed flow impeller that allows easy balance adjustment.

The above-mentioned problem is solved by the following present invention. That is, the mixed flow type impeller of the present invention includes a base having an annular inclined surface inclined with respect to the rotation axis, and a first outer circumferential part and a second outer circumferential part surrounding the outer circumferential side of the inclined surface; a plurality of blades provided on the inclined surface, the first outer circumferential portion and the second outer circumferential portion have different outer shapes, and the first outer circumferential portion and the second outer circumferential portion have different outer shapes. A recessed portion is provided in one of the outer peripheral portions.

In the mixed flow impeller of the present invention, markings may be made on the other of the first outer circumference and the second outer circumference.
Further, in the mixed flow impeller of the present invention, the first outer circumferential portion is provided inside the second outer circumferential portion in the radial direction, and the first outer circumferential portion is marked. A concave portion may be provided on the outer circumferential portion of 2.
Furthermore, in the mixed flow type impeller of the present invention, the first outer circumferential portion may be provided between the inclined surface and the second outer circumferential portion in the direction of the rotation axis.

In the mixed flow type impeller of the present invention, it is preferable that the impeller is made of a resin member.

1 is a top view of a mixed flow impeller according to an embodiment of the present invention; FIG. FIG. 1 is a side view of a mixed flow impeller according to an embodiment that is an example of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a diagonal flow impeller according to an embodiment of the present invention, as seen diagonally from above. FIG. 4 is a partially enlarged perspective view of a portion of the diagonal flow impeller shown in FIG. 3; It is a top view of the mixed flow type impeller concerning the modification which is an example of this invention. FIG. 2 is a perspective view of a diagonal flow type impeller according to a modified example of the present invention, as seen diagonally from above. It is a perspective view for explaining the notched part of the mixed flow type impeller according to the modification which is an example of the present invention.

Hereinafter, a mixed flow impeller according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a top view of a mixed flow impeller 1 according to an embodiment of the present invention, and FIG. 2 is a side view of the mixed flow impeller 1. 3 is a perspective view of the diagonal flow type impeller 1 seen diagonally from above, and FIG. 4 is a partially enlarged perspective view of a portion of the diagonal flow type impeller 1 shown in FIG. 3.

In the description of this embodiment, the direction of the arrow a in the direction of the rotation axis x is referred to as an upper side a, and the direction of an arrow b is referred to as a lower side b. In addition, in the direction perpendicular to the rotation axis x (hereinafter also referred to as "radial direction"), the direction away from the rotation axis x (direction of arrow c) is defined as the outer peripheral side c, and the direction toward the rotation axis x (direction of arrow d) is the inner peripheral side d. The circumferential direction (direction of arrows e and f) centered on the rotation axis x is the circumferential direction e (hereinafter also referred to as "clockwise") and the circumferential direction f (hereinafter also referred to as "counterclockwise"). shall be.

As shown in FIGS. 1 to 3, the mixed flow impeller 1 of this embodiment includes a base 12 and a plurality of blades 13 provided on the base 12. The mixed flow type impeller 1 is formed of a resin member.

The base 12 includes an inclined part 20 having an annular inclined surface 20s inclined with respect to the rotation axis x, and a first outer peripheral part 21 and a second outer peripheral part 22 that surround the outer peripheral side c of the inclined part 20 in the radial direction. , and a cylindrical tube portion 23 provided on the upper side a in the direction of the rotation axis x.
The base 12 is fixed to a shaft (not shown) and rotates as the shaft rotates.

The inclined surface 20s of the inclined portion 20 is inclined downward from the inner circumferential side d toward the outer circumferential side c. A plurality of blades 13 are provided on the inclined surface 20s.

The first outer peripheral part 21 and the second outer peripheral part 22 have different external shapes. That is, as shown in FIG. 1, in this embodiment, the diameter dimension A, which is the dimension in the radial direction of the first outer circumferential portion 21, is smaller than the diameter dimension B, which is the dimension in the radial direction of the second outer circumferential portion 22. Therefore, it becomes smaller (A<B).
In addition, as shown in FIG. 2, the height dimension C, which is the dimension of the first outer peripheral part 21 in the rotation axis x direction, is the same as the height dimension D, which is the dimension of the second outer peripheral part 22 in the rotation axis x direction. They are equal (C=D).

As shown in FIG. 3, the first outer peripheral part 21 is provided between the inclined surface 20s and the second outer peripheral part 22 in the rotation axis x direction. That is, the inclined surface 20s, the first outer peripheral part 21, and the second outer peripheral part 22 are provided in this order from the upper side a to the lower side b in the direction of the rotation axis x.
Further, the side surface 21c of the first outer circumferential portion 21 is provided on the inner circumferential side d from the side surface 22c of the second outer circumferential portion 22 in the radial direction.

As shown in FIG. 4, the first outer circumferential portion 21 is provided continuously from the outer circumferential side c of the inclined surface 20s, and the side surface 21c facing the outer circumferential side c is marked with a mark 24.
The mark 24 is a display that serves as an indicator when detecting the rotation phase such as the rotation angle, rotation speed, rotation speed, etc. in the circumferential direction e of the mixed flow type impeller 1.
This mark 24 is, for example, a rectangular or linear tape or sticker pasted on the side surface 21c, or a display drawn with a pen on the side surface 21c, and has a height that does not exceed the height dimension C of the first outer peripheral portion 21. It is provided in area S1 of.
Note that a plurality of marks 24 may be provided on the side surface 21c of the first outer peripheral portion 21.

As shown in FIG. 4, the second outer peripheral part 22 has an upper surface 22a facing the upper side a that is continuous from the lower side b of the side surface 21c of the first outer peripheral part 21, and is continuous from the outer peripheral side c of the upper surface 22a. A recess 25 is provided on the side surface 22c facing the outer peripheral side c.
The recess 25 is one or more holes 26 recessed from the outer circumferential side c to the inner circumferential side d. This recess 25 is formed in order to adjust the rotational balance by forming one or more holes 26 with a tool when the rotational balance of the mixed flow impeller 1 is unbalanced. For example, if the center of gravity of the mixed flow impeller 1 does not coincide with the rotation axis Adjust the center of gravity so that it coincides with the rotation axis x.
The one or more holes 26 are formed in a region S2 having a height not exceeding the height dimension D on the side surface 22c of the second outer peripheral portion 22.
Note that a plurality of recesses 25 may be provided on the side surface 22c of the second outer peripheral portion 22.

The cylindrical portion 23 has a cylindrical shape centered on the rotation axis x, and has a shaft (not shown) held therein. A circular opening 27 is provided in the upper side a of the cylindrical part 23, and a shaft (not shown) can be pulled out from the inside of the cylindrical part 23 to the outside.

The plurality of blades 13 are attached at equal intervals in the circumferential direction e on the inclined surface 20s. The plurality of wings 13 have a fixed part 31 fixed to the inclined surface 20s, an upper end part 32 provided on the upper side a, a lower end part 33 provided on the lower side b, and an upper end part 32 and a lower end part 33. It has a curved portion 34 provided between the fixing portion 31 and the upper end portion 32 and facing toward the outer peripheral side c, and an inclined surface 35 inclined between the fixing portion 31 and the upper end portion 32.
The wing 13 is configured such that an airflow is generated from the upper side a to the lower side b by the counterclockwise rotation f of the base 12.

The fixing portion 31 is fixed to the inclined surface 20s from the upper side a to the lower side b.
The upper end portion 32 is curved so that the e side is convex in the clockwise direction from the outer circumferential side c to the inner circumferential side d of the inclined surface 20s, and the lower end portion 33 is curved in a straight line from the upper side a to the lower side b. ing.
The lower end portion 33 is provided flush with the side surface 21c of the first outer peripheral portion 21 in the direction of the rotation axis x.
The curved portion 34 has the thickest thickness at an intermediate portion between the upper end portion 32 and the lower end portion 33, and is curved so that the counterclockwise f side is convex from the upper side a toward the lower side b.
The inclined surface 35 faces the outer peripheral side c and the inner peripheral side d, and slopes downward from the upper side a to the lower side b.

In the mixed flow impeller 1 according to the present embodiment, the first outer circumferential portion 21 and the second outer circumferential portion 22 have different external shapes. That is, as shown in FIG. 1, the diameter dimension A, which is the radial dimension of the first outer peripheral portion 21, is smaller than the diameter dimension B, which is the radial dimension of the second outer peripheral portion 22. There is (A<B). Therefore, a mark 24 for detecting the rotational phase of the mixed flow impeller 1 is provided on the first outer circumference 21, and a recess 25 for adjusting the rotational balance of the mixed flow impeller 1 is provided on the second outer circumference 22. Each can be provided.

In conventional mixed-flow impellers with one outer periphery of the base, when adjusting the balance after markings are made on the outer periphery to detect the rotational phase, a recess is formed in the marked outer periphery to adjust the balance. The markings will disappear when adjusted.
In addition, forming recesses in the air flow path such as slopes or blades may affect the wind flow and noise, and it may be difficult to adjust the balance of mixed flow impellers. .

However, with the configuration of the present invention, it is possible to provide the concave portion 25 for adjusting the balance without any restriction over the entire circumference of the second outer peripheral portion 22 without the mark 24 for detecting the rotational phase disappearing. Therefore, the balance of the mixed flow impeller 1 can be easily adjusted.

Further, in the mixed flow impeller 1 according to the present embodiment, the first outer circumferential portion 21 is provided inside the second outer circumferential portion 22 in the radial direction, and the recess 25 is provided in the second outer circumferential portion 22. It is being The first outer peripheral part 21 is provided between the inclined surface 20s and the second outer peripheral part 22 in the direction of the rotation axis x. Therefore, when forming the hole 26 in the recess 25 of the second outer peripheral part 22 with a tool or the like, it is possible to prevent the tool from hitting the first outer peripheral part 21, the inclined surface 20s, and the blade 13. Therefore, damage to the mixed flow type impeller 1 can be prevented and balance adjustment can be easily performed.

Furthermore, since the mixed flow impeller 1 according to this embodiment is formed of a resin member, it can be made lighter.
As described above, the mixed flow impeller 1 according to this embodiment can easily perform balance adjustment.

Next, a mixed flow impeller 100 according to a modification of the present invention will be described with reference to the drawings.
FIG. 5 is a top view of a mixed-flow impeller 100 according to a modified example of the present invention, and FIG. 6 is a perspective view of the mixed-flow impeller 100 viewed diagonally from above. Further, FIG. 7 is a diagram for explaining a cutout portion P of the mixed flow type impeller 100. In the description of this modification, the same reference numerals as in the above embodiment are given to the members or parts having the same function and structure as in the above embodiment in FIGS. 5 to 7, and the detailed explanation thereof will be omitted. (However, this does not apply if a special explanation is added.)

In this modification, the configurations of the first outer circumferential portion 121 and the second outer circumferential portion 122 are different from the first outer circumferential portion 21 and the second outer circumferential portion 22 of the above embodiment.
As shown in FIGS. 5 to 7, the second outer peripheral part 122 in this modification is provided only in a part of the outer peripheral part 120 of the mixed flow impeller 100.

The outer peripheral part 120 of the base 112 includes a first outer peripheral part 121 that surrounds the outer peripheral side c of the inclined part 20 in the radial direction, and a second outer peripheral part 122 that is provided only in a part of the outer peripheral part 120. include.
Further, as shown in FIG. 6, the height dimension E, which is the dimension in the rotation axis x direction of the first outer circumferential part 121 of the area where the second outer circumferential part 122 is not formed in the outer circumferential part 120 of the base 112, is , is larger (E>F) than the height F, which is the dimension of the second outer peripheral portion 122 in the direction of the rotation axis x.

As shown in FIG. 7, the first outer circumferential portion 121 in the region where the second outer circumferential portion 122 is not formed is provided continuously from the outer circumferential side c of the inclined surface 20s. A side surface 121c facing the outer circumferential side c of the first outer circumferential portion 121 is marked with a mark 124.
The second outer circumferential portion 122 is formed by cutting out a portion of the inclined surface 20s and a portion P that is a portion of the outer circumferential portion 120 of the base 112. By cutting out the portion P, the second outer peripheral portion 122 is formed with a side surface 122c facing the outer peripheral side c. Further, the outer peripheral portion 120 of the base 112 is formed with an upper surface 120a facing in the rotation axis x direction and a peripheral surface 120e facing in the circumferential direction e.

Part P is a part where, when the rotational balance of the mixed flow type impeller 1 is biased, the rotational balance is adjusted by cutting out a part of the inclined surface 20s and a part of the outer peripheral part 120 of the base 112 with a tool. . For example, if the center of gravity of the mixed flow impeller 100 does not coincide with the rotation axis x, it is assumed that the rotational balance of the mixed flow impeller 100 is biased, and by cutting out the portion P, the mass of the cut out portion is reduced. Adjust so that the center of gravity matches the rotation axis x.
Note that before the part P is cut out, the outer peripheral part 120 of the base 112 is marked with a mark 124, and when the part P on which the mark 124 is formed is cut out to adjust the rotational balance, the mark 124 is marked. A portion remains on the side surface 121c of the first outer peripheral portion 121.

Although the range of the portion P varies depending on the amount by which the rotational balance of the mixed flow impeller 100 is adjusted, the maximum range of the portion P in the radial direction is a range from the lower end portion 33 of the blade 13 to the outer circumferential side c. That is, the maximum range of the portion P in the radial direction is a range in which the blade 13 is not cut out.
Further, the maximum range of the portion P in the direction of the rotation axis x is the range a above the height dimension E of the first outer peripheral portion 121. That is, the maximum range of the portion P in the rotation axis x direction is a range smaller than the height dimension E of the first outer peripheral portion 121. Note that the maximum range of the portion P in the circumferential direction e is the entire circumference of the outer circumferential side c of the outer circumferential portion 120 of the base 112.

A side surface 122c of the second outer circumferential portion 122 formed by cutting out the portion P is provided continuously from the outer circumferential side c of the inclined surface 20s, and an upper surface 120a of the outer circumferential portion 120 of the base 112 is connected to the side surface 122c. It is provided continuously from the lower side b.

In this modification, as shown in FIG. 7, the second outer circumferential portion 122 is formed by cutting out the portion P, and as in the above embodiment, balance adjustment can be easily performed. That is, the mark 124 for detecting the rotational phase of the mixed flow impeller 100 is provided on the outer peripheral portion 120 of the base 112, and the portion P is cut out to form the second outer peripheral portion 122. Adjust the balance. Therefore, even if the position where the mark 124 for detecting the rotational phase is formed is the portion P, the mark 124 remains on the side surface 121c of the first outer peripheral portion 121 and does not disappear. Therefore, the position where the portion P for adjusting the balance is cut out can be selected over the entire circumference of the outer peripheral portion 120 of the base 112, and the balance of the mixed flow impeller 100 can be easily adjusted.

Further, in this modification, the maximum range of the portion P is within a range in which the blade 13 is not cut out in the radial direction. Therefore, it is possible to suppress the influence on the wind flow and noise caused by cutting out the path through which the air flows, such as the blade.

Furthermore, in this modification, in order to adjust the rotational balance of the mixed flow impeller 1, even if it is necessary to cut out the portion P including the mark 124 provided on the outer peripheral portion 120 of the base 112, The maximum range of the portion P is within a range smaller than the height dimension E of the first outer peripheral portion 121 in the rotation axis x direction. Therefore, the portion P can be cut out without the mark 124 for detecting the rotational phase disappearing, and the balance of the mixed flow impeller 100 can be easily adjusted.

In this modification, the maximum range of the portion P in the circumferential direction e is the entire circumference of the outer peripheral portion 120 of the base 112. Therefore, by cutting out the portion P in a different range in the circumferential direction e depending on the amount by which the rotational balance of the mixed flow impeller 100 is adjusted, the mark 124 can be cut out while suppressing the influence on the wind flow and noise. You can easily adjust the balance without disappearing.

Although the mixed flow type impeller of the present invention has been described above with reference to preferred embodiments, the mixed flow type impeller of the present invention is not limited to the configurations of the above embodiments and modifications. For example, in the mixed flow type impeller of the above embodiment, markings 124 are made on the side surface 21c of the first outer circumferential portion 21, and a recess 25 is formed on the side surface 22c of the second outer circumferential portion 22. Although the description has been given as an example, the recess 25 may be formed on the side surface 21c of the first outer circumferential portion 21, and the marking with the mark 24 may be made on the side surface 22c of the second outer circumferential portion 22.

Further, in the mixed flow impeller 1 of the above embodiment, the recess 25 is provided on the side surface 22c of the second outer circumferential portion 22, but the recess is provided on the upper surface 22a facing the upper side a. 25 may be provided.

Furthermore, in the mixed flow impeller 1 of the above embodiment, the height dimension C of the first outer peripheral part 21 and the height dimension D of the second outer peripheral part 22 are explained as an example. However, the height dimension C of the first outer peripheral part 21 may be smaller or larger than the height dimension D of the second outer peripheral part 22.

In addition, those skilled in the art can appropriately modify the mixed flow impeller of the present invention based on conventionally known knowledge. As long as such modifications still have the structure of the present invention, they are, of course, included within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1,100...Mixed flow type impeller, 12,112...Base, 13...Blade, 20...Slope part, 20s...Slope surface, 21,121...First outer peripheral part, 21c, 121c...Side surface, 22,122...th 2 outer peripheral part, 22a, 120a...upper surface, 22c, 122c...side surface, 23...cylindrical part, 24, 124...mark, 25...recessed part, 26...hole, 27...opening, 31...fixing part, 32...upper end part, 33...Lower end part, 34...Curved part, 35...Slanted surface, 120...Outer peripheral part, 120e...Surrounding surface

Claims (5)

A base having a cylindrical part extending in the direction of the rotation axis, an annular inclined surface inclined with respect to the rotation axis, and a first outer peripheral part and a second outer peripheral part surrounding the outer peripheral side of the inclined surface. ,
a plurality of wings provided on the inclined surface,
In the radial direction, the first outer circumference is between the annular inclined surface and the second outer circumference,
The plurality of wings extend from the cylindrical portion to the first outer peripheral portion,
A path through which air flows is formed between the plurality of blades,
In the direction of the rotation axis, the path is open toward the opposite side to the base,
The first outer peripheral part and the second outer peripheral part have different external shapes,
A mixed flow impeller, wherein a concave portion is provided in one of the first outer circumferential portion and the second outer circumferential portion. The mixed flow impeller according to claim 1, wherein the other of the first outer circumferential portion and the second outer circumferential portion is marked. The first outer circumferential portion is provided inside the second outer circumferential portion in the radial direction,
Marking is made on the first outer peripheral portion,
The mixed flow impeller according to claim 1 or 2, wherein the second outer peripheral portion is provided with a recess. The mixed flow impeller according to any one of claims 1 to 3, wherein the first outer circumferential portion is provided between the inclined surface and the second outer circumferential portion in the direction of the rotation axis. The mixed flow impeller according to any one of claims 1 to 4, which is formed of a resin member.

Images