JPS6017275Y2 - Aeration device for oxidation ditch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aeration device for an oxidation ditch.

As a type of aeration device for oxidation ditches, flat blade bodies are fixed to the outer circumferential surface of a rotating shaft along the radial direction in the axial direction of the rotating shaft and at appropriate intervals in the circumferential direction. There is one in which the lower end of the rotation path is set below the water surface of the oxidation ditch, and aeration and stirring are performed by rotation of the blades.

However, in conventional aeration equipment of this type, a large number of blades are arranged in a line along the axial direction of the rotating shaft, so the blades in this row hit the water surface at the same time, causing a large impact on the rotating shaft. As a result, the rotary shaft and its drive mechanism are subject to severe wear and damage, resulting in a short lifespan of the device.

In view of the above points, the present invention aims to provide an aeration device for an oxidation ditch that does not receive a large impact on the rotating shaft.

That is, the present invention is arranged around a rotating shaft at appropriate intervals along a first straight line at twisted positions that form a predetermined angle with respect to the axis of the rotating shaft; A plurality of flat blades whose positions are regulated along the radial direction and along the axial direction of the rotating shaft are connected to one end of the first straight line and another first straight line adjacent to the first straight line. A plurality of sets are provided in the circumferential direction of the rotating shaft so that a second straight line connecting the other end of the straight line is along the axial direction of the rotating shaft, and these blade bodies and the rotating shaft are connected, and the blade is Since the bodies are arranged at appropriate intervals along the straight line of the twist position that forms a predetermined angle to the axis of the rotating shaft, a large number of blade bodies do not hit the water surface at the same time, and therefore there is no large impact on the rotating shaft. This will extend the life of the device.

An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 1 denotes a pipe-shaped rotating shaft rotatably supported by bearings 4 installed on a pair of brackets 3 protruding from the wall surface of a concrete frame 2 constituting the oxidation ditch. A plurality (four in this embodiment) of annular support plates 5a to 5d are externally fitted and fixed to the shaft 1 at appropriate intervals in the axial direction.

A gap 6 formed by these four support plates 5a to 5d
A to 6c are each provided with a support member 7 made of an angle material or the like, and both ends of the support member 7 are connected to the support plates 5a to 5 by means of brackets and bolt nuts (not shown).
It is removably attached to the outer periphery of d.

The support members 7 arranged in each of the gaps 6a to 6C are arranged in a line of three in a set on a straight line at a twisted position forming a predetermined angle with respect to the axis of the rotating shaft 1, One end and the other end of this set of support members 7 are arranged 3 times around the axis of the rotating shaft 1.
A set of three support members 7, which are offset by 0 degrees and form a straight line, are arranged at equal intervals around the axis of the rotating shaft 1 (every 30 degrees in this embodiment) as shown in FIG. It is installed in

That is, a total of 12 sets of 36 support members 7 are provided, and a straight line connecting one end of each set of support members 7 and the other end of the adjacent set of support members 7 is aligned with the axis of the rotating shaft 1. become parallel straight lines.

Flat blade bodies 8 are attached to each of the support members 7 at appropriate intervals in the longitudinal direction.

These blade bodies 8 are substantially along the radial direction of the rotation shaft 1, and each blade body 8 is connected to the rotation axis by a plate 9 fixed to the support member 7, as shown in detail in FIG. It is fixed to both the support member 7 and the plate body 9 by a method such as welding in a state where the position is restricted along the axial direction of the shaft 1.

Further, the attachment positions of these many blade bodies 8 to the support member 7 are adjusted so that their tips are located within one virtual cylindrical surface concentric with the rotation shaft 1.

In addition, in FIG. 1, in order to make the drawing easier to understand, only three sets of support members 7 and blade bodies 8 attached thereto are shown, which are located every 60 degrees around the axis of the rotating shaft 1, and the others are not shown. It is omitted.

10 is an electric motor that drives the rotating shaft 1, and the output of this electric motor 10 is a V-pulley 11, a plurality of belts 12,
It is transmitted to the rotating shaft 1 via a pulley 13, a cyclo reducer 14, a chain link spring 15, a shaft body 16, and a flange joint 17.

In FIG. 1, reference numeral 18 denotes a pair of drainage plates externally fitted and fixed to the rotating shaft 1, 19 a ground bearing, 20 a cover that covers the blade body 8, etc., 21 a bearing cover that covers the bearing 4, and 22 is a building that covers the electric motor 10 and the like.

In the aeration device having the above configuration, when the electric motor 10 is operated, the rotating shaft 1 rotates, the blades 8 strike the water surface, and aeration is performed.

At this time, each set of support members 7 is on a straight line at the twisted position that makes a predetermined angle with respect to the axis of the rotating shaft 1, and one end of the straight line and another straight line adjacent to this straight line are located at one end of the straight line. Since the second straight line connecting the ends is arranged along the axial direction of the rotating shaft 1, the blade bodies 8 successively hit the water surface one by one.

Therefore, no large impact is applied to the rotating shaft 1.

The life of the device can be significantly extended, and the required power is smoothed out, so the electric motor can be downsized and aeration can be carried out efficiently.

In addition, since each blade body 8 is formed into a flat plate shape whose position is regulated along the radial direction of the rotation shaft 1 and parallel to the axial direction of the rotation shaft 1, the blade body 8 is Despite being placed along the straight line of the twist position relative to the axis of 1.

In addition to being able to prevent inconveniences such as the generation of a load in the axial direction of the rotating shaft 1 during aeration, the water in the oxidation ditch can be efficiently circulated, and the circulation flow rate can be maintained at a high level.

Furthermore, by attaching the blade body 8 to the support member 7 as in this embodiment, the blade body 8 can be made shorter and lighter than the conventional blade body which is directly attached to the rotating shaft. In addition, impurities such as dirt will not get entangled with the rotating shaft 1, and the impeller 8 will not be caused by freezing of the water surface.
damage can be prevented.

In the above embodiment, an example was described in which the blade body 8 was coupled to the rotation shaft 1 via the support plates 5a to 5d and the support member 7, but the blade body 8 may be directly attached to the rotation shaft 1.

Further, the support member 7 does not necessarily have a diameter of 30 mm around the axis of the rotating shaft 1.
It is not necessary to provide it at every degree, and it may be set at other angles.

As explained above, according to the aeration device for an oxidation ditch according to the present invention, since the blades continuously hit the water surface one after another over the entire circumference, many blades simultaneously hit the water surface. Since the rotating shaft is not subjected to a large impact, the life of the device can be greatly extended, the required power can be smoothed, the electric motor can be made smaller, and the blade body can be placed at the center of the rotating shaft. Even though it is placed along the straight line of the twist position with respect to
In addition to preventing inconveniences such as the generation of loads in the axial direction of the rotating shaft during aeration, the water in the oxidation ditch can be circulated efficiently and the circulation efficiency can be maintained at a high level, allowing for efficient aeration. can be carried out.

[Brief explanation of drawings]

FIG. 1 is a front view of an aeration device in an embodiment of the present invention;
FIG. 2 is a schematic sectional view of the blade and the rotating shaft portion, and FIG. 3 is an enlarged plan view of the main part of the support member to which the blade is attached. 1...Rotating shaft, 8...Blade body.

Claims (1)

[Scope of utility model registration request] They are arranged around the rotating shaft at appropriate intervals along a first straight line at twisted positions forming a predetermined angle with respect to the axis of the rotating shaft, and are arranged along the radial direction of the rotating shaft. A plurality of flat blades whose positions are regulated parallel to the axial direction of the rotating shaft are connected to one end of the first straight line and the other end of another first straight line adjacent to the first straight line. An aeration device for an oxidation ditch, characterized in that a plurality of sets are provided in the circumferential direction of the rotating shaft so that second straight lines connecting the blades are along the axial direction of the rotating shaft, and these blade bodies and the rotating shaft are connected. .