JP2003144886A - Impeller for agitation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impeller for agitation which has a plurality of blades each formable easily and quickly without spending time and effort and can be driven with significantly reduced driving power. SOLUTION: In each of a plurality of blades 20, a side edge 24 in one longitudinal direction of a band plate 22 is cut in an obliquely linear shape to the inner side of the band plate 22 from the middle part toward the tip part of the edge 24. Bordering on an obliquely linear bending line 28 set toward the middle part of the side edge 24 in the one longitudinal direction of the band plate cut in the obliquely linear shape from the middle part of the side edge 26 in the other longitudinal direction of the band plate located at the opposite side of the cut start point 25 of the middle part of the side edge in the one longitudinal direction of the band plate, the tip part 27 of the band plate is folded obliquely downward to the hinder part 29 of the band plate to form each blade 20 having the same shape. Each of a plurality of blades 20 is extended by radially be arranged around a hub 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirring impeller for stirring various objects to be stirred contained in a stirring tank.

[0002]

2. Description of the Related Art U.S. Pat.
S. Pat. 5,297,938, U.S.P. S. Pat.
There are impellers associated with 4,468,130. According to these stirring impellers, the discharge amount (the axial flow rate of the agitated fluid or the like with respect to the rotating impeller) is slightly 90% as compared with the conventional general-purpose paddle type impeller. Although it decreases, the driving power for rotating the impeller is almost the same performance (discharging amount is almost the same) as compared with the conventional general-purpose paddle type impeller, and it is drastically reduced by more than 50%. Can be made. Then, running costs such as power consumption of the impeller can be significantly reduced. In addition, U.S.S. S. Pa
t. According to the impeller according to 5,297,938, since the axial flow rate of the impeller is larger than that of the conventional general-purpose paddle type impeller, the agitated object located at the bottom of the agitation tank is included. Therefore, the object to be stirred in the entire stirring tank can be evenly and efficiently stirred. At the same time, since the blade balance is improved, it is possible to miniaturize the driving means including a rotating shaft that supports and rotates the impeller, an electric motor that rotates the shaft, a reduction gear, and the like. And the cost such as the equipment cost can be significantly reduced. Therefore, these impellers may be widely used as impellers for energy saving and resource saving in recent years. Here, a paddle-type impeller has a plurality of flat strip-shaped blades fitted around the rotating shaft and rotating around the hub around the hub. An impeller formed by inclining at a substantially uniform angle such as 45 degrees with respect to a plane that intersects with each other and extending radially in a direction substantially perpendicular to the axis of the hub.

[0003]

However, the above U.S. Pat. S. Pat. Impellers such as 5,297,938
A plurality of blades radially extending around the hub had a complicated arcuate shape, and a great deal of labor and labor was required to form the blades. Therefore, the present inventor, after earnest research, in order to facilitate the work of forming the blades in the above-mentioned impeller, a flat plate having a shape close to a strip plate is used.
It has been conceived that it would be better if the blade is shaped like a blade of the above-mentioned impeller by bending it into a plane shape instead of an arc shape. Then, the above-mentioned U. S. Pat. 5,297,9
A blade formed by bending a predetermined portion of a flat plate having a shape similar to the strip plate in a shape similar to that of the impeller of 38,
A plurality of sheets were formed. Then, an impeller having a plurality of blades extending radially around the hub was prototyped. Then, using the prototype impeller, a stirring test of the fluid contained in the stirring tank was conducted. Then, the stirring impeller has the above U. S. Pat. It has been found that it has almost the same performance as the impeller of 5,297,938. That is, it has been found that the drive power of the prototype impeller has substantially the same performance as that of the conventional general-purpose paddle type impeller and can be significantly reduced by about 50% or more. In addition, according to the prototype impeller, the flow rate in the axial direction is increased, and compared with the conventional general-purpose paddle-type impeller,
Including the object to be stirred located at the bottom of the stirring tank, it is possible to efficiently and efficiently stir the object to be stirred in the entire stirring tank.
found. At the same time, it has been found that the blade balance is improved, and the drive means including the rotating shaft for supporting the prototype impeller, the electric motor for rotating the shaft, the reduction gear, and the like can be significantly downsized. Then, based on such a test result, a plurality of blades having a simple shape obtained by bending a predetermined portion of a flat plate having a shape close to the strip plate into a flat shape are radially extended around the hub. We have developed a stirring impeller that can significantly reduce the mixing efficiency and significantly improve the stirring efficiency.

That is, according to the present invention, a plurality of blades having a simple shape obtained by bending a predetermined portion of a flat plate having a shape close to a strip plate in a plane shape are radially extended around the hub, and drive power is greatly increased. An object of the present invention is to provide an impeller for stirring, which can reduce the stirring efficiency and can significantly improve the stirring efficiency.

[0005]

For this purpose, the stirring impeller of the present invention has a hub attached to a rotating shaft and rotating together with the rotating shaft, and extending radially around the hub. Each of the plurality of blades is formed such that one longitudinal side edge of the strip is cut diagonally linearly inward from the midpoint to the tip of the strip. , One of the strips that has been cut in a straight line from the side edge midway portion in the other longitudinal direction of the strip located on the opposite side of the cut start point of the side edge midway portion in the one longitudinal direction of the strip The front of the strip is bent diagonally downward with respect to the rear of the strip, and the strip is formed from the strip at the front of the strip, with the folding line of the diagonal straight line set to the middle of the side edge in the longitudinal direction as a boundary. The rear part of each of the formed plurality of blades,
Attached to the hub with the rear surface of the vane inclined at a substantially uniform angle to a plane perpendicular to the axis of the hub and in a direction substantially perpendicular to the axis of the hub; The inclination angle β of the tip surface of each of the plurality of vanes with respect to a plane perpendicular to the axis of the hub is relative to the plane of the trailing surface of the vane perpendicular to the plane of the hub. It is characterized by being set to a smaller angle than the inclination angle α.

In this stirring impeller, each of the plurality of blades is simply slanted linearly inwardly of the strip from one of the longitudinal side edges of the strip to the end of the strip. One of the strips that is cut in a straight line diagonally from the other half of the longitudinal side edge of the strip located on the opposite side of the cut start point of the other half of the longitudinal side edge of the strip. With the diagonal straight bending line set along the middle of the side edge in the longitudinal direction as a boundary, the front end of the strip is simply bent obliquely downward to the rear of the strip to form a flat surface. It can be easily and quickly formed without hanging.

In the stirring impeller of the present invention, the tip portion is defined by a plane including the axis of the hub substantially perpendicular to the extending direction of the blades extending around the hub and the bending line. The width of the rear portion of the blade formed from the strip is set to about D / 6, where D is the distance from the tip of the blade made of the flat strip before folding. The distance between the plane including the axis of the hub substantially perpendicular to the extending direction of the strip and the start point of the cut in the middle of one side edge of the strip in the longitudinal direction is set to about 0.4D. The width of the tip of the blade is set to about D / 9, and the inclination angle λ of the folding line with respect to the other side edge in the longitudinal direction of the strip is set to about 45 degrees. The bending angle γ of the front part of the strip bent downward with respect to the rear part of the strip is about 1
The inclination angle α with respect to the plane perpendicular to the axis of the hub of the rear surface of the blade attached to the hub, which is set to 5 degrees.
Is set to about 30 to 32 degrees, and the inclination angle β with respect to the plane perpendicular to the axis center of the hub of the tip surface of the blade whose rear part is attached to the hub is set to about 20 to 22 degrees. It is preferable that the structure has a different structure.

In this stirring impeller, the driving power of the impeller is higher than that of a conventional general-purpose paddle type impeller.
It has almost the same performance and can be reduced to less than 50%. Further, the stirring ability can be significantly improved as compared with the conventional general-purpose paddle type impeller.
At the same time, the blade balance can be improved, and the driving means including the rotating shaft supporting the impeller, the electric motor rotating the shaft, the reduction gear, and the like can be made significantly compact.

In the stirring impeller of the present invention, it is preferable that the rear portion of the blade is detachably attached to the hub.

In this stirring impeller, when the blade extending around the hub is damaged or abraded and its performance is deteriorated, the blade is damaged or abraded. The rear part can be easily and quickly removed from the hub. Then, the rear portion of the new blade can be easily and quickly reattached to the hub. Then, the damaged or worn blade can be replaced easily and quickly.

[0011]

1 and 2 show a preferred embodiment of a stirring impeller of the present invention, FIG. 1 is a plan view thereof, and FIG.
Is a front view thereof. The impeller for stirring will be described below.

In this stirring impeller, as shown in FIG. 1, each of a plurality of blades 20 (three in the drawing) radially extending around the hub 10 is provided with a strip 22 of uniform width. One side edge 24 in the longitudinal direction is cut inwardly in a straight line from the midway portion to the tip end 23 thereof, and the cutting of the midway portion of the one side edge 24 in the longitudinal direction of the strip is started. The diagonal linear shape set from the midway portion of the other longitudinal side edge 26 of the strip located on the opposite side of the point 25 to the midway portion of the longitudinal side edge 24 of one of the strips cut in the diagonal linear shape. The front portion 27 of the strip is bent diagonally downward with respect to the rear portion 29 of the strip at the folding line 28 as a boundary to form the same shape.

As shown in FIG. 2, the rear portion 29 of each of a plurality of identically formed blades formed from the strip 22 has a rear surface 29 of the blade which is a plane perpendicular to the axis 12 of the hub. Inclining the hub 1 at a substantially uniform angle and directing the hub 1 toward a direction substantially perpendicular to the axis 12 of the hub.
No. 0 is attached by welding or the like. Then, the hub axis 12 on the surface of the tip end portion 23 of each of the plurality of blades 20
The inclination angle β with respect to the plane 14 perpendicularly crossing is set to be smaller than the inclination angle α with respect to the plane 14 perpendicularly crossing the hub axis 12 of the rear surface 29 of the blade.

The hub 10 has a cylindrical shape and has a rotating shaft 30.
The structure is such that it can be attached to a predetermined portion of the rotating shaft 30 by being fitted around the hub 10 and tightening a screw 40 or the like screwed on the peripheral wall of the hub 10.

In this stirring impeller, each of the plurality of blades 20 is formed by simply cutting the tip of one side edge of the strip plate 22 into the strip plate 22 inwardly in a slanting linear shape. 22 With the diagonal linear bending line 28 set in the middle part, the front end 27 of the strip is simply bent obliquely downward with respect to the rear part 29 of the strip, and the labor and labor are required. It can be easily and quickly formed without hanging.

In the stirring impeller shown in FIGS. 1 and 2, as shown in FIGS. 3, 4 and 5, the impeller 20 extending around the hub 10 is substantially oriented in the extending direction. When the distance between the plane 18 including the axis 12 of the vertical hub and the blade tip portion 23 formed of the flat plate-shaped band plate 22 before folding the tip portion 27 at the folding line 28 is D And the width of the rear portion 29 of the blade formed from the strip 22 is about D /
6, between the plane 18 including the axis 12 of the hub substantially perpendicular to the extending direction of the blades 20 and the cut start point 25 at the midpoint of one longitudinal side edge 24 of the strip 22. Set the distance to about 0.4D and set the width of the tip 23 of the blade to about D
/ 9, the inclination angle λ of the bending line 28 with respect to the other side edge 26 in the longitudinal direction of the strip 22 is set to about 45 degrees, and the bending line 28 is bent downward. A fold angle γ of the front end 27 of the plate with respect to the rear part 29 of the strip is set to about 15 degrees, and a plane 14 perpendicularly crossing the hub axis 12 on the surface of the rear part 29 of the blade attached to the hub 10.
The inclination angle α with respect to is set to about 30 to 32 degrees, and the inclination of the surface of the tip portion 23 of the blade having the rear portion 29 attached to the hub 10 with respect to the plane 14 perpendicular to the axis 12 of the hub. The angle β may be set to about 20 to 22 degrees.

According to the experimental results, in the stirring impeller (I) set in this way, as shown in Table 1 below, the driving power (load power) of the impeller is set to the conventional general-purpose. It was found that, compared with the paddle type impeller (P) of (1), the same performance (having the same discharge amount) can be reduced to about 50% or less. Further, it has been found that the stirring ability can be significantly improved as compared with the conventional general-purpose paddle type impeller. At the same time, it has been found that the blade balance can be improved and the drive means including the rotating shaft supporting the impeller, the electric motor rotating the shaft, the reduction gear, and the like can be made significantly compact.

[0018]

[Table 1]

6 and 7 show another preferred embodiment of the stirring impeller of the present invention, FIG. 6 is a plan view thereof, and FIG. 7 is a front view thereof. The impeller for stirring will be described below.

In this stirring impeller, the rear portion 29 of the blade is
Is detachably attached to the support arm 16 extended to the hub 10 by using a plurality of bolts 18 and the like. Others are the same as those of the stirring impeller shown in FIGS. 1 and 2.

In this impeller for agitation, when the blade 20 extending around the hub 10 is damaged or worn and its performance deteriorates, it is extended to the hub 10. The damaged or worn blade rear portion 29 attached to the support arm 16 by using the bolt 18 or the like can be easily and quickly removed from the hub 10 by loosening the bolt 18. Then, the support arm 16 extended to the hub 10
In addition, the rear portion 29 of the new blade can be easily and quickly reattached by using the plurality of bolts 18 and the like. And
The damaged or worn blade 20 can be replaced easily and quickly.

[0022]

As described above, according to the stirring impeller of the present invention, each of the blades radially extending around the hub of the impeller is provided at the tip of one side edge of the strip in the strip. Simply cut in a straight line diagonally to the side, or at the bending line of the diagonal straight line set in the middle part of the strip plate, the front part of the strip plate is simply flattened diagonally downward with respect to the rear part of the strip plate. It can be easily and promptly formed by simply bending it in a simple manner without labor and effort. And, greatly simplifying the manufacturing process of the impeller for stirring,
It can be facilitated. Further, the driving power of the stirring impeller has substantially the same performance as that of the conventional general-purpose paddle type impeller, and can be significantly reduced by almost 50% or more. Further, compared with the conventional general-purpose paddle type impeller, the object to be stirred in the entire stirring tank, including the object to be stirred located at the bottom of the stirring tank, can be evenly and efficiently stirred. At the same time, the drive means including the rotary shaft that supports the stirring impeller, the electric motor that rotates the shaft, the reduction gear, and the like can be significantly downsized. Further, it is possible to provide an energy-saving type impeller with high stirring efficiency.

[Brief description of drawings]

FIG. 1 is a plan view of a stirring impeller of the present invention.

FIG. 2 is a front view of the stirring impeller of the present invention.

FIG. 3 is a dimensional drawing of the blades of the stirring impeller of the present invention.

FIG. 4 is a view of the blade of the impeller for stirring according to the present invention as seen from the bending line direction.

FIG. 5 is a front view of the impeller of the stirring impeller of the present invention.

FIG. 6 is a plan view of the stirring impeller of the present invention.

FIG. 7 is a front view of the stirring impeller of the present invention.

[Explanation of reference numerals] 10 hub 12 hub axis 14 plane 16 that crosses the axis of the hub perpendicularly 16 support arm 18 plane 20 including the axis of the hub substantially perpendicular to the extending direction of the blade 20 blade 22 strip 23 Blade tip 25 Cutting start point 27 Strip front 28 Bending line 29 Strip rear 30 Rotation axis

Claims (3)

[Claims] 1. A hub, which is attached to a rotating shaft and rotates together with the rotating shaft, and a plurality of blades extending radially around the hub, each of the plurality of blades being a strip plate. One side edge in the longitudinal direction is cut diagonally inward from the midway portion to the tip end of the strip plate, and the side opposite to the cutting start point in the midway portion of the one side edge portion in the longitudinal direction of the strip plate. With the diagonal linear bending line set from the other longitudinal side edge midway portion of the strip located at to the one longitudinal longitudinal side edge midway portion of the diagonal linearly cut strip, The front portion of the strip is formed in the same shape by being bent obliquely downward with respect to the rear portion of the strip, and the rear portion of each of the plurality of blades formed from the strip has the rear surface of the blade on the hub. Inclined at a substantially uniform angle with respect to a plane perpendicular to the axis of Te, toward a direction substantially perpendicular to the axis of the hub, is attached to the hub,
The inclination angle β of the tip surface of each of the plurality of vanes with respect to a plane perpendicular to the axis of the hub is relative to the plane of the trailing surface of the vane perpendicular to the plane of the hub. A stirring impeller characterized by being set to an angle smaller than the inclination angle α. 2. A flat-belt band before the front part is bent with a plane including the axis of the hub substantially perpendicular to the extending direction of the blades extending around the hub and the bending line as a boundary. When the distance between the blade and the tip of the blade is D,
The width of the rear portion of the blade formed from the strip is set to about D / 6, and the plane including the axis of the hub substantially perpendicular to the extending direction of the blade and the longitudinal direction of one of the strips. The distance between the cut start point of the middle portion of the side edge is set to about 0.4D, the width of the tip portion of the blade is set to about D / 9, and the length of the folding line strip in the other longitudinal direction is set. The inclination angle λ with respect to the side edge is set to about 45 degrees, and the bending angle γ with respect to the rear portion of the front strip of the strip bent downward at the folding line is set to about 15 degrees. The inclination angle α of the rear surface of the blade attached to the hub with respect to a plane perpendicular to the axis of the hub is set to about 30 to 32 degrees.
An inclination angle β of a surface of a tip portion of a blade having a rear portion attached to the hub with respect to a plane perpendicular to the axis of the hub is about 20.
The impeller for stirring according to claim 1, wherein the impeller is set to -22 degrees. 3. The impeller for stirring according to claim 1, wherein a rear portion of the blade is detachably attached to the hub.