JP2021146250A - Guide plate for impeller and manufacturing method of guide plate for impeller - Google Patents

Abstract

To provide a guide plate for impeller capable of being produced by simple molding.SOLUTION: A guide plate for impeller is used for an impeller placed in a water channel through which treated water flows, and the guide plate for impeller is characterized by having two or more bends. The guide plate for impeller can be manufactured through a simple operation. This reduces the number of work processes, thereby improving production efficiency.SELECTED DRAWING: Figure 4

Description

The present invention relates to a guide plate for an impeller of an aeration agitator for a biological water treatment facility and a method for manufacturing an impeller guide plate for an aeration agitator.

As a biological treatment facility for biologically treating water to be treated such as sewage and sewage, a method of using an oxidation ditch tank in which a non-terminal circulating water channel is formed is known. Three types of aeration stirring devices in this oxidation ditch tank are known: a vertical axis type, a horizontal axis type, and an oblique axis type.
The vertical axis type aeration agitator performs surface aeration by rotating the impeller with a part of the impeller protruding above the surface of the water to be treated, and forms a stirring flow in the oxidation ditch tank to form microorganisms. It prepares the growing environment of.

Further, in order to agitate the water to be treated in the entire circulation channel, a guide plate is used to join the stirring stream formed in the vertical axis type aeration stirring device with the circulating stream flowing in the circulating channel.
Patent Document 1 describes a vertical axis type aeration stirring device including a guide plate having a shape that is bent in an arc shape along the rotation direction of the impeller.

Japanese Unexamined Patent Publication No. 2019-005728

The guide plate for the impeller used in the conventional vertical axis type aeration agitator is the size of the vertical axis type aeration agitator, the shape and size of the oxidation ditch tank in which the vertical axis type aeration agitator is installed, and the water flow to be generated. The shape of the arc was determined in advance at the time of production according to the direction and momentum of.
However, it is not easy to form an arc-shaped guide plate for an impeller so as to draw a smooth curve because a dedicated machine tool is required and fine adjustments are manually performed. Therefore, there is a problem that the number of work processes increases and the production efficiency is poor.

Therefore, an object of the present invention is to provide a guide plate for an impeller that can be produced by simple molding.

As a result of diligent studies on the above problems, the present inventor has found that the work process can be reduced and the production efficiency can be improved by manufacturing a guide plate for an impeller by bending a plurality of parts of a plate member into a rectangle. Completed. That is, it is the following method for manufacturing an impeller guide plate and an impeller guide plate.

The impeller guide plate of the present invention for solving the above problems is an impeller guide plate used for an impeller arranged in a water channel through which water to be treated flows, and the impeller guide plate is two or more. It is characterized by having a bent portion.
According to the impeller guide plate of the present invention, the impeller guide plate can be manufactured by a simple bending operation of the plate members or a simple connecting operation of the plate members. As a result, the work process can be reduced, and the production efficiency can be improved.
Further, when the guide plate and the wall surface of the water channel are fixed by the support member, it is difficult to attach the bracket to the arc-shaped curved guide plate because the portion to be attached is curved. In addition, the mounting of the bracket became unstable, and the fixing of the support and the guide plate was unstable. On the other hand, according to the present invention, since the guide plate for the impeller is formed of a flat plate member, the support and the guide plate can be easily and firmly attached.

Further, as one embodiment of the impeller guide plate of the present invention, it is arranged between the first guide plate, the second guide plate and the third guide plate, and the first guide plate and the second guide plate. A second bent portion is provided between the first bent portion and the second guide plate and the third guide plate, and the first guide plate is arranged at a position closest to the wall surface of the water channel, and the first is said. The bent portion of the first guide plate is characterized in that it is located on the upstream side of the end portion on the side closer to the wall surface of the first guide plate.
Due to the rotation of the impeller, a stirring flow is formed around the impeller so as to orbit the vertical axis type aeration stirring device. Then, a strong flow toward the guide plate is generated between the impeller and the wall surface. According to the above characteristics, since the first guide plate is installed from the wall surface toward the upstream side of the circulation channel, the stirring flow toward the guide plate between the impeller and the wall surface is applied to the guide plate while maintaining a strong momentum. It flows along. Therefore, a strong stirring flow is generated along the guide plate, and the water to be treated in the circulating water channel can be effectively stirred and circulated.

Further, in one embodiment of the impeller guide plate of the present invention, the distance between the center of the horizontal cross section of the first guide plate and the shaft of the impeller is set to the center of the horizontal cross section of the second guide plate and the shaft of the impeller. It has the characteristic that it is shorter than the distance of.
According to this feature, the second guide plate installed farther from the wall surface is formed so as to be farther from the impeller than the first guide plate. Therefore, the strong stirring flow generated between the first guide plate and the impeller flows into the wide space formed between the second guide plate and the impeller, so that it flows along the guide plate while maintaining a strong momentum. Can be done. Therefore, a strong stirring flow is generated along the guide plate, and the water to be treated in the circulating water channel can be effectively stirred and circulated.

Further, in one embodiment of the impeller guide plate of the present invention, the impeller guide plate includes an end portion arranged in the water channel from the end portion on the side close to the wall surface of the first guide plate, and the end portion. The bent portion of the guide plate having the portion of the guide plate rotates, or the guide plate having the end portion expands and contracts.
According to this feature, the flow direction of the agitated flow generated by the impeller can be finely adjusted.

Further, one embodiment of the impeller guide plate of the present invention is characterized in that the impeller guide plate can be divided into two or more.
According to this feature, the impeller guide plate can be completed by assembling the plate members divided into small pieces at the installation site. Therefore, even when the work space is limited due to the size of the carry-in entrance or the like, the impeller guide plate can be efficiently installed.

The method for manufacturing an impeller guide plate of the present invention for solving the above problems is a method for manufacturing an impeller guide plate used for an impeller arranged in a water channel through which water to be treated flows, and is a method for manufacturing the impeller guide plate. The plate is characterized by forming two or more bends.
According to the method for manufacturing an impeller guide plate of the present invention, the impeller guide plate can be manufactured by a simple bending operation of the plate members or a simple connecting operation of the plate members. As a result, the work process can be reduced, and the production efficiency can be improved.

According to the present invention, it is possible to provide a guide plate for an impeller that can be produced by simple molding.

It is schematic explanatory drawing which shows the structure of the biological treatment equipment of this invention in the case of plan view of an unterminated waterway. It is a schematic explanatory drawing which shows the structure of the vertical axis type aeration agitator of this invention in the cross section of an unterminated water channel. It is a schematic explanatory drawing which shows the method of fixing a guide plate with respect to an endless water channel. It is a schematic explanatory drawing which shows the guide plate for an impeller in the 1st Embodiment of this invention in the case of a plan view of an unterminated water channel. It is a schematic explanatory drawing which shows the stirring flow generated by the guide plate for an impeller in the 1st Embodiment of this invention in the case of a plan view of an unterminated water channel. It is a schematic explanatory drawing which shows the stirring flow generated by the guide plate for an impeller in the 1st Embodiment of this invention in the cross section of an unterminated water channel. It is a schematic explanatory drawing which shows the stirring flow generated by the guide plate for an impeller in the 2nd Embodiment of this invention in the case of a plan view of an unterminated water channel. It is a schematic explanatory drawing which shows the stirring flow generated by the guide plate for an impeller in the 2nd Embodiment of this invention in the cross section of a non-terminal channel. It is a schematic explanatory drawing which shows the guide plate for an impeller in the 3rd Embodiment of this invention in the case where the non-terminal waterway is viewed in a plan view. It is a schematic explanatory drawing which shows the guide plate for an impeller in the 3rd Embodiment of this invention in the case where the non-terminal waterway is viewed in a plan view. It is a schematic explanatory drawing which shows the guide plate for an impeller in the 4th Embodiment of this invention in the case of a plan view of an unterminated water channel.

[First Embodiment]
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic explanatory view showing a configuration of a biological treatment facility 1 when the non-terminal water channel 2 is viewed from a plane. The biological treatment equipment 1 is an impeller arranged on the upstream side of the non-terminal water channel 2 composed of the straight water channel 2a and the circulation water channel 2, the vertical axis type aeration stirring device 3 arranged in the straight water channel 2a, and the vertical axis type aeration stirring device 3. A guide plate 4 for use is provided. The arrows in the figure represent the circulating flow flowing through the non-terminal water channel 2.

(Biological treatment equipment)
The biological treatment equipment 1 in the present invention is used for the oxidation ditch method in which biological treatment is performed while circulating the water to be treated in the non-terminal water channel 2. The water to be treated is not particularly limited, and examples thereof include organic wastewater such as sewage, livestock wastewater, and factory wastewater.

The biological treatment equipment 1 includes an endless water channel 2 formed by a peripheral wall 21 and a partition wall 22, a vertical axis type aeration stirring device 3 installed in the non-terminal water channel 2, and an upstream side of the vertical axis type aeration stirring device 3. The impeller guide plate 4 of the present invention installed in the vicinity is provided.

The non-terminal water channel 2 is composed of two linear water channels 2a extending in parallel and a circulation water channel 2b that connects the straight water channels 2a at both ends of the two straight water channels 2a to form a circulating flow to be treated. In the biological treatment equipment 1 of the first embodiment, the vertical axis type aeration stirring device 3 is installed in the vicinity of the partition wall 22 of the straight water channel 2a. The vertical axis type aeration stirring device 3 may be arranged in the circulation flow path 2b.

(Vertical axis type aeration stirrer)
FIG. 2 is a schematic explanatory view showing the structure of the vertical axis type aeration stirring device 3. As shown in FIG. 2, the vertical axis type aeration stirring device 3 has a shaft 31 installed in the vertical direction, a plurality of impellers 32 radially attached to the shaft 31, and a connecting plate 33 connecting the plurality of impellers 32. And a drive unit 34 for supplying power for rotating the shaft 31. The plurality of impellers 32 are made of plate members fixed to the shaft 31, and the axial direction of the shaft 31 and the surface of the plate member are attached in parallel. The connecting plate 33 is fixed to substantially the center of the surface of the plate member of the impeller 32, and the impeller 32 is formed so as to protrude on the upper surface side and the lower surface side of the connecting plate 33, respectively. The connecting plate 33 connects the impeller 32 at a position separated from the shaft 31, and a water passage hole 34 through which the water to be treated passes is formed between the connecting plate 33 and the shaft 31 (FIG. 6). See 4.). The shaft 31 is connected to the drive unit 34 and is rotationally driven by the drive unit 34.

The vertical axis type aeration stirring device 3 is installed with a part of the impeller 32 exposed on the surface of the water to be treated. When the shaft 31 is rotated in this state, the water to be treated that has passed through the water passage hole 34 is scattered around as droplets by the action of the impeller 32 protruding toward the upper surface side of the connecting plate 33 (see FIG. 2). As a result, surface aeration can be performed and the growth environment for aerobic microorganisms can be adjusted. Further, the droplets of the water to be treated scattered around the vertical axis type aeration stirring device 3 can crush the scum floating on the water surface of the water to be treated.

Further, as shown in FIG. 2, the impeller 32 protruding toward the lower surface side of the connecting plate 33 forms a stirring flow that orbits around the vertical axis type aeration stirring device 3 inside the water to be treated. The agitated flow is rectified by the guide plate 4 described later, and forms a circulating flow in the non-terminal water channel 2.

Further, the vertical axis type aeration stirring device 3 may be provided with an elevating device that rotatably supports the shaft 31 and enables elevating and lowering. Thereby, the position of the impeller 32 with respect to the water to be treated in the non-terminal water channel 2 can be controlled, and the amount of the water to be treated scattered to the surroundings as droplets by the action of the impeller 32 can be made appropriate. Further, by completely submerging the impeller 32 in the water to be treated as needed, the stirring flow can be generated more strongly.

(Guide plate)
FIG. 4 is a schematic explanatory view showing the configuration of the guide plate 4 of the present invention in the first embodiment when the non-terminal water channel 2 is viewed from a plane.
The guide plate 4 is intended to stir and circulate the water to be treated in the non-terminal water channel 2 by guiding the stirring flow generated by the impeller 32 of the vertical axis type aeration stirring device 3.

The guide plate 4 is fixed to the partition wall 22 so as to cover the upstream side of the vertical axis type aeration stirring device 3. As shown in FIG. 2, the height position of the guide plate 4 is such that the upper end is located substantially on the surface of the water to be treated and the lower end is located at the same level as or slightly higher than the lower end of the vertical axis type aeration agitator. By locating the upper end of the guide plate 4 substantially on the water surface, the droplets scattered by the rotation of the impeller 32 land on the surroundings, and the oxygen supply efficiency can be improved. In addition, it is excellent in the action of eliminating floating scum. Further, by installing the lower end of the guide plate 4 in the same manner as the lower end of the vertical axis type aeration stirring device, the stirring flow generated by the rotation of the impeller 32 can be guided to a predetermined position.

Further, as shown in FIG. 3, the fixing between the guide plate 4 and the partition wall 22 is reinforced by the support 46. The support 46 is a member that connects the partition wall 22 and the guide plate 4, and reinforces the fixing of the guide plate 4 to the partition wall 22. The size, installation location, material, etc. of the support 46 are not particularly limited, but specifically, a rod shape made of a corrosion-resistant metal such as stainless steel or a metal subjected to corrosion-resistant processing. It is a member of.
The support 46 and the guide plate 4 are connected via the bracket 45. The bracket 45 is a member for connecting the guide plate 4 and the support 46, and is attached by fixing means such as welding or bolts. The material of the bracket 45 is not particularly limited, but specifically, it is formed of a corrosion-resistant metal such as stainless steel or a metal subjected to corrosion-resistant processing. The shape is, for example, a hinge shape.

According to the guide plate 4 in this embodiment, since the guide plate 4 is formed of a flat plate member, the bracket 45 is stably attached to the guide plate 4. By this. The guide plate 4 can be firmly fixed to the partition wall 22.

The material of the guide plate 4 includes, but is not limited to, resin such as plastic, metal such as iron and aluminum, and wood. For example, a corrosion-resistant metal such as stainless steel, a metal subjected to corrosion-resistant processing, and the like are preferable. As a result, the maintenance cycle can be shortened because it does not corrode even if it is in contact with organic wastewater such as sewage, livestock wastewater, and factory wastewater for a long time and has high strength.

In the first embodiment, as shown in FIG. 4, the first bent portion 41A to the fourth bent portion 41D are provided. Further, the guide plate 4 of the first embodiment includes a first guide plate 42A to a fifth guide plate 42E, and a first guide plate 42A and a second guide plate 42B are located between the first guide plate 42A and the second guide plate 42B. A bent portion 41A is formed, a second bent portion 41B is formed between the second guide plate 42B and the third guide plate 42C, and a second bending portion 41B is formed between the third guide plate 42C and the fourth guide plate 42D. The bent portion 41C of 3 is formed, and the fourth bent portion 41D is formed between the fourth guide plate 42D and the fifth guide plate 42E. The first guide plate 42A is arranged at a position closest to the partition wall 22 which is the wall surface of the water channel, and the end portion (base end portion 43) on the side closer to the partition wall 22 is fixed to the partition wall 22. The terminal portion 44 facing the fourth bent portion 41D of the guide plate 42E of No. 5 is arranged in the non-terminal water channel 2. Then, a vertical axis type aeration stirring device 3 is arranged between the base end portion 43 and the terminal portion 44 of the guide plate 4, the upstream side of the vertical axis type aeration stirring device 3 is covered with the guide plate 4, and the guide plate 4 is on the downstream side. A region through which the water to be treated flows is formed without arranging the plate 4.

The first bent portion 41A to the fourth bent portion 41D are portions where the guide plate 4 is bent into a rectangular shape, and the angle and shape of bending the guide plate 4 are not particularly limited. Further, in the present embodiment, the guide plate 4 is bent at four locations of the first bent portion 41A to the fourth bent portion 41D, but the number of bent portions is not particularly limited.

Further, the first bent portion 41A to the fourth bent portion 41D may be formed by joining a plurality of plate members by welding or the like. In this case, by assembling the plate members divided into small pieces at the site, it is possible to easily perform the installation work at the site when the work space is limited due to the size of the carry-in entrance or the like.

Next, the flow of the stirring flow generated by the rotation of the impeller 32 will be described. FIG. 5A shows a stirring flow generated by the guide plate 4 in the first embodiment when the non-terminal water channel 2 is viewed in a plan view. Further, FIG. 5B shows a stirring flow generated by the guide plate 4 in the first embodiment in the cross section of the non-terminal water channel 2.

As shown in FIG. 5A, the impeller 32 rotates counterclockwise in plan view in FIG. 5A. As a result, the agitated flow generated by the impeller 32 flows along the guide plate 4. Here, in the guide plate 4 of the first embodiment, the end portion 44 of the fifth guide plate 42E is installed from the fourth bent portion 41D toward the partition wall 22. As a result, the agitated flow flowing along the guide plate 4 forms a flow that collides with the partition wall 22. The agitated flow that collides with the partition wall 22 forms a descending flow along the partition wall 22, and the descending agitated flow flows toward the peripheral wall 21 along the bottom of the endless water channel 2. The flow toward the peripheral wall 21 collides with the peripheral wall 21 to form an ascending flow. In this way, the agitation flow generated by the rotation of the impeller 32 by the guide plate 4 becomes a spiral flow toward the downstream of the circulation flow, and the sediment accumulated at the bottom of the unterminated water channel 2 can be raised and agitated. It becomes.

In order to form a strong spiral flow, it is necessary to collide with the partition wall 22 while maintaining the momentum of the stirring flow generated by the impeller 32. From such a viewpoint, it is preferable that the first bent portion 41A is arranged upstream from the proximal end portion 43. As a result, the first guide plate 42A is installed from the base end portion 43 toward the upstream side. A narrow space is formed between the impeller 32 and the partition wall 22, and when the water to be treated in the narrow space is agitated by the impeller 32, a high-speed stirring flow is formed. Since the first guide plate 42A is arranged toward the upstream side, it is possible to form a flow along the guide plate 4 while maintaining the momentum of this high-speed stirring flow. From the viewpoint of maintaining the momentum of the high-speed stirring flow, the angle (obtuse angle side) formed by the partition wall 22 and the first guide plate 42A is preferably 100 ° or more, more preferably 120 ° or more.

Further, as shown in FIG. 4, the distance (d1) between the horizontal cross-sectional central portion X1 of the first guide plate 42A and the shaft 31 of the impeller 32 is the distance (d1) between the horizontal cross-sectional central portion X2 of the second guide plate 42B and the impeller 32. It is preferably shorter than the distance (d2) from the axis 31 of. The central portion of the horizontal cross section is the central position of the horizontal cross section of the guide plate at the height position of the upper end portion of the impeller 32.
Since the second guide plate 42B installed farther from the wall surface is formed so as to be farther from the impeller 32 than the first guide plate 42A, strong stirring generated between the first guide plate 42A and the impeller 32 is generated. Since the flow flows into the wide space formed between the second guide plate 42B and the impeller 32, it can flow along the guide plate 4 while maintaining a strong momentum. Therefore, a strong stirring flow is generated along the guide plate 4, and the water to be treated in the circulating water channel can be effectively stirred and circulated.

Further, it is preferable to install the guide plate so that the distance between the central portion of the horizontal cross section and the axis of the impeller becomes longer in order from the partition wall 22 toward a distance. For example, the distance (d1) between the horizontal cross-section center portion (X1) of the first guide plate 42A and the shaft 31 of the impeller 32, the horizontal cross-section center portion (X2) of the second guide plate 42B, and the shaft 31 of the impeller 32. Distance (d2), distance between the horizontal cross-section center portion (X3) of the third guide plate 42C and the shaft 31 of the impeller 32 (d3), the horizontal cross-section center portion (X4) of the fourth guide plate 42D and the impeller 32. The distance (d4) from the shaft 31 and the distance (d5) between the central portion of the horizontal cross section (X5) of the fifth guide plate 42E and the shaft 31 of the impeller 32 are sequentially increased. Thereby, a strong stirring flow can be formed.

Further, the horizontal length of the first guide plate 42A (distance from the base end portion 43 of the first guide plate 42A to the first bent portion 41A) is set to that of at least one other guide plate 42B to 42E. It is preferably shorter than the horizontal length (between the bent portions of the guide plate or the distance between the bent portion and the end portion). Furthermore, it is preferable that the horizontal length of the first guide plate 42A is shorter than the horizontal length of all the other guide plates 42B to 42E. In particular, it is preferable that the length of each guide plate in the horizontal direction gradually increases from the first guide plate 42A toward the end portion 43. As a result, the region between the other guide plate and the impeller 32 becomes larger than the region between the first guide plate 42A and the impeller 32. That is, since the stirring flow flowing along the first guide plate 42A flows into a wider area than between the first guide plate 42A and the impeller 32, it is possible to maintain a strong stirring flow without weakening the momentum. can.

Further, the angles formed by all the bent portions are preferably obtuse angles. As a result, when the stirring flow is formed along the guide plate 4, a strong stirring flow can be formed without weakening the momentum. The angle formed by all the bent portions is preferably 100 ° or more, more preferably 110 ° or more, and further preferably 120 ° or more.

In the guide plate 4 of the present invention, the number of bent portions and the number of guide plates are not particularly limited. It can be appropriately determined according to the angle of the bent portion and the setting of the area between the impeller 32 and the guide plate. If the number of bent portions and guide plates is increased, the shape becomes closer to an arc, and a strong stirring flow can be formed. By reducing the number of bent parts and guide plates, it is easier to process and productivity is improved. From such a viewpoint, the number of bent portions is preferably 2 or more, more preferably 3 or more, and further preferably 4 or more. The upper limit of the number of bent portions is preferably 10 or less.

The first guide plate 42A to the fifth guide plate 42E may be rotatably formed and fixed by a fixing member. Thereby, when the guide plate 4 is installed at the site, the shape of the guide plate 4 can be determined at the site according to the size of the non-terminal water channel 2 and the flow of the water to be treated.
Further, at least one bent portion of the guide plate 4 may be formed so as to be rotatable and fixed by a fixing member. Thereby, the flow direction of the agitated flow formed by the impeller 32 can be adjusted. Further, the guide plate 4 may be formed so that only the bent portion connecting the guide plates constituting the end portion 44 can be rotatably formed. Since the guide plate forming the terminal portion 44 plays a large role in determining the direction of the agitated flow formed by the impeller 32, the flow direction of the agitated flow formed by the impeller 32 can be finely adjusted.

The first guide plate 42A to the fifth guide plate 42E may be expandable and contractible. Thereby, when the guide plate 4 is installed at the site, the shape of the guide plate 4 can be determined at the site according to the size of the non-terminal water channel 2 and the flow of the water to be treated.
Further, the guide plate 4 may expand and contract only the fifth guide plate 42E constituting the terminal portion 44. Since the guide plate forming the terminal portion 44 plays a large role in determining the direction of the agitated flow formed by the impeller 32, the flow direction of the agitated flow formed by the impeller 32 can be finely adjusted.

The guide plate 4 may be divided into two or more. By making it separable, there is an effect that the volume can be reduced when it is transported to the site. Further, when the size of the carry-in entrance or the like is limited, it is possible to carry in in small pieces.

[Second embodiment]
FIG. 6A shows the configuration of the guide plate 4 and the stirring flow generated by the guide plate 4 in the second embodiment when the non-terminal water channel 2 is viewed in a plan view. Further, FIG. 6B shows a stirring flow generated by the guide plate 4 in the second embodiment in the cross section of the non-terminal water channel 2.

The guide plate 4 of the second embodiment includes a first guide plate 42A, a second guide plate 42B, a third guide plate 42C, a fourth guide plate 42D, a first guide plate 42A and a second guide. A first bent portion 41A formed between the plates 42B, a second bent portion 41B formed between the second guide plate 42B and the third guide plate 42C, a third guide plate 42C and a fourth A third bent portion 41C formed between the guide plates 42D of the above is provided. Then, as shown in FIG. 6A, the fourth guide plate 42D is installed toward the peripheral wall 21 side. As a result, the agitated flow generated by the impeller 32 collides with the peripheral wall 21 facing the partition wall 22. As shown in FIG. 6B, the agitated flow colliding with the peripheral wall 21 forms a descending flow along the peripheral wall 21, and the descending agitated flow is directed toward the partition wall 22 along the bottom of the endless channel 2. It flows. The flow toward the partition wall 22 collides with the partition wall 22 to form an ascending flow. As described above, as in the first embodiment, the agitated flow generated by the rotation of the impeller 32 becomes a spiral flow toward the downstream of the circulating flow by the guide plate 4, and the sediment accumulated at the bottom of the endless water channel 2 is removed. It can be raised and stirred.

[Third Embodiment]
7A and 7B are schematic explanatory views showing a guide plate 5 according to a third embodiment of the present invention when an unterminated water channel is viewed from a plane.
The third embodiment has the same configuration as the first embodiment except for the fourth bent portion and the fifth guide plate.
The fourth bent portion 51D in the third embodiment is rotatable. Further, the fifth guide plate in the third embodiment is characterized in that it can be expanded and contracted.

As shown in FIGS. 7A and 7B, the fourth bent portion in the present embodiment is the last bent portion counted from the base end portion 53 of the guide plate 5.
As shown in FIG. 7A, the fourth bent portion 51D in this embodiment is characterized in that it is rotatable. According to this feature, it is possible to change the angle of the fifth guide plate 52E with respect to the fourth guide plate 52D when the non-terminal water channel 2 is viewed in a plan view.

In addition, as shown in FIG. 7B, the fifth guide plate 52E in this embodiment is characterized in that it can be expanded and contracted. According to this feature, the direction and the flow velocity of the agitated flow generated by the impeller 31 can be appropriately changed.

These features make it possible to appropriately change the direction and flow velocity of the agitated flow generated by the impeller 31. Further, when the guide plate 5 is installed in the non-terminal water channel 2, or after the guide plate 5 is installed, the direction and the flow velocity of the agitated flow generated by the impeller 31 can be easily changed. Therefore, even if the guide plate 5 does not exhibit the predetermined performance when installed in the non-terminal water channel 2 due to inconsistency in dimensions or the like in the process of manufacturing the guide plate 5, it can be easily corrected at the site. No need to reproduce.

Further, in the present embodiment, the fourth bent portion is used as an example of the bendable portion that can be rotated or expanded and contracted, but which of the two or more bent portions of the guide plate of the present invention can be rotated. Alternatively, it may be stretchable. Further, a plurality or all of the bent portions may be rotatable or expandable.

[Fourth Embodiment]
FIG. 8 is a schematic explanatory view showing a guide plate 6 according to a third embodiment of the present invention when the non-terminal water channel is viewed from a plane.
The bent portions 61A to the fourth bent portion 61D in the fourth embodiment have, in principle, the same functions as the bent portions 41A to the fourth bent portion 41D in the first embodiment, but the first Each of the bent portions 61A to the fourth bent portion 61D is not joined. As a result, the first guide plate 62A to the fifth guide plate 62E in the present embodiment constitute the guide plate 6 as independent plate members.
Of the guide plates 6, the base end portion 63 and the end portion 64 are the same as the base end portion 43 and the end portion 44 in the first embodiment or the base end portion 53 and the base end portion 54 in the second embodiment. be.
The description of the same configuration as that of the first embodiment or the second embodiment will be omitted.

The first bent portion 61A to the fourth bent portion 61D in the present embodiment are characterized in that they are not joined. Therefore, each of the first guide plate 62A to the fifth guide plate 62E is installed in the non-terminal water channel 2 as an independent plate member. As a result, when the guide plate 6 is installed in the non-terminal waterway 2, the plate members divided into small pieces are installed at the site, so that the work space is limited due to the size of the carry-in entrance or the like. Construction can be done easily. In addition, installation work is easy because it is not necessary to join each independent plate member by welding or the like at the site.

Further, in the present embodiment, the bent portions that are not joined are taken as examples of all the bent portions of the guide plate 6, but which of the two or more bent portions of the guide plate of the present invention is not joined. You may. Furthermore, the plurality or all bends may not be joined.

The first guide plate 62A to the fifth guide plate 62E in the present embodiment are the same as the first guide plate to the fifth guide plate in the first embodiment or the second embodiment in principle. .. However, since the first bent portion 61A to the fourth bent portion 61D are not joined, the first guide plate 62A to the fifth guide plate 62E in the present embodiment are characterized in that they are independent plate members. do. The first guide plates 62A to the fifth guide plates 62E in the present embodiment may be arranged so as to be in contact with each other, or may be installed apart from each other.

Further, in the present embodiment, as an example of the plate members installed apart from each other, all the plate members constituting the guide plate 6 are used, but one of the plate members constituting the guide plate 6 of the present invention is used. The plate members of the portions may be installed apart from each other.

The above-described embodiment shows an example of an impeller guide plate. The impeller guide plate according to the present invention is not limited to the above-described embodiment, and the impeller guide plate according to the above-described embodiment may be modified without changing the gist of the present invention.

For example, the vertical axis type aeration stirring device 3 in this embodiment may be installed in the circulating water channel 2b instead of the straight water channel 2a. This makes it possible to effectively agitate the water to be treated in the vicinity of the circulating water channel 2b where scum and the like are likely to accumulate.

The impeller guide plate of the present invention can be suitably used for a vertical axis type aeration stirrer for biological water treatment equipment.

1 Biological treatment equipment, 2 Non-terminal waterway, 2a Straight waterway, 2b Circulation waterway, 21 Peripheral wall, 22 Section wall, 3 Vertical axis type aeration stirrer, 31 axis, 32 impeller, 33 connecting plate, 34 water passage hole, 4 , 5,6 Guide plate, 41A, 51A, 61A 1st bent part, 41B, 51B, 61B 2nd bent part, 41C, 51C, 61C 3rd bent part, 41D, 51D, 61D 4th bent part , 42A, 52A, 62A 1st guide plate, 42B, 52B, 62B 2nd guide plate, 42C, 52C, 62C 3rd guide plate, 42D, 52D, 62D 4th guide plate, 42E, 52E, 62E Fifth guide plate, 43,53,63 base end, 44,54,64 end, 45 bracket, 46 support

Claims (6)

An impeller guide plate used for an impeller placed in a water channel through which water to be treated flows.
The impeller guide plate is a guide plate for an impeller, characterized in that it includes two or more bent portions. A first guide plate, a second guide plate and a third guide plate, and a first bent portion, a second guide plate and a third guide plate arranged between the first guide plate and the second guide plate. A second bend is provided between the guide plates of
The first guide plate is arranged at a position closest to the wall surface of the water channel.
The impeller guide plate according to claim 1, wherein the first bent portion is located on the upstream side of the end portion of the first guide plate on the side closer to the wall surface. The second aspect of the present invention, wherein the distance between the central portion of the horizontal cross section of the first guide plate and the shaft of the impeller is shorter than the distance between the central portion of the horizontal cross section of the second guide plate and the shaft of the impeller. Guide plate for impeller. The impeller guide plate includes an end portion arranged in the water channel from an end portion of the first guide plate on the side close to the wall surface, and a bent portion of the guide plate having the end portion rotates. The impeller guide plate according to claim 2 or 3, wherein the guide plate having the end portion expands and contracts. The impeller guide plate according to any one of claims 1 to 4, wherein the impeller guide plate can be divided into two or more. A method for manufacturing an impeller guide plate used for an impeller placed in a water channel through which water to be treated flows.
A method for manufacturing an impeller guide plate, wherein the impeller guide plate forms two or more bent portions.

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