JP3806412B2 - Elevating device for aeration gas in aeration tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for raising and lowering a diffused gas in an aeration tank.
[0002]
[Prior art]
In general, aerobic treatment in which sludge is biologically treated with aerobic microorganisms is provided with a diffused gas horizontally along the bottom surface of the aeration tank, and bubbles are formed in the aeration tank from the diffused holes of the diffused gas. I try to aerate by blowing air.
[0003]
In an aeration tank that performs this aerobic treatment, clogging or the like may occur in the spout hole of the diffused gas, and smooth aeration may not be performed. For this reason, conventionally, this type of aeration tank has been provided with a lifting device for raising the diffused gas from the tank bottom to the upper surface opening for maintenance.
[0004]
The conventional lifting device generally lifts the diffused gas with a wire. As the lifting mode, the lifted air is changed from a horizontal state to a vertical state and then lifted upward (see Patent Document 1). There is one that lifts while maintaining a horizontal state (see Patent Document 2).
[0005]
[Patent Document 1]
JP 2001-246394 A [Patent Document 2]
Japanese Utility Model Publication No. 1-128900 [0006]
[Problems to be solved by the invention]
The lifting device that lifts the above-mentioned diffused gas from the horizontal state to the vertical state rotates upward with one side of the diffused gas as a fulcrum at the time of transition from the horizontal state to the vertical state. Therefore, it is not easy to adjust the distance from the bottom of the aeration tank. In addition, after lifting the diffused gas, the diffused gas is transported out of the aeration tank to perform maintenance, and the work is complicated and a work space is required.
[0007]
Since the apparatus for lifting the diffused gas in a horizontal state hangs up and down by suspending several points of the center line of the diffused gas with a wire, the horizontal state is difficult to maintain, and the lifting and lowering action is not smooth. In addition, since there is no means to support the upper surface of the aeration tank after the lifting of the diffused gas, even if the diffused gas is transported to a place away from the aeration tank, or if it is performed on the upper surface of the aeration tank, it is supported. It is necessary to provide a means separately. For this reason, the work is complicated and a large work space may be required.
[0008]
It is a first object of the present invention to improve workability such as maintenance of diffused gas and to reduce the work space, and to make it easy to adjust the gap between the diffused gas and the bottom of the aeration tank. A third problem is to smoothly raise and lower the diffused gas in a horizontal state.
[0009]
[Means for Solving the Problems]
In order to achieve the first object, the present invention is such that the diffused gas is provided with a diffuser tube on a stationary frame, and the upper surface opening periphery of the aeration tank can be moved inward and outward from the periphery. A support is provided, and the support is configured to be locked to the lower surface of the stationary frame in a protruding state to prevent the air diffuser from descending.
[0010]
If an aeration tube is provided on the stationary frame, it is only necessary to support the load with the stationary frame, and if the stationary frame is locked with a mechanical strength by a support, an operator is placed on the stationary frame on the upper surface of the aeration tank. Work such as maintenance. For this reason, it is not necessary to secure a work space for maintenance in a space other than the aeration tank, and since the upper surface of the aeration tank becomes a work space, it is possible to shift to the maintenance work with rising (lifting) of the diffused gas. Is good.
[0011]
In order to achieve the second problem, the present invention provides a leg at a required position of the diffused gas, screws the legs vertically into the diffused gas, and adjusts the screwing amount to adjust the screwing amount. The length of the leg in the vertical direction relative to the gas is adjustable.
[0012]
If the leg length is adjustable, the gap between the diffuser pipe and the bottom of the tank (diffused water depth) can be adjusted, so that the level of the diffused water depth at the site construction can be easily set.
[0013]
In order to achieve the third problem, the present invention forms a quadrangular diffused gas provided horizontally along the bottom surface of the aeration tank, attaches wires to the four corners, and connects the wires in the same manner. The diffused gas can be raised and lowered in the horizontal state via a guide by simultaneously pulling up and pulling back the amount.
[0014]
If a rectangular diffused gas is lifted at the four corners by the same amount and at the same time, it can be lifted in a horizontal state, and if guided by a guide, the diffused gas smoothly moves up and down without shaking. At this time, if it is lifted with the stationary frame, the lifting force is borne by the stationary frame, so the header pipe and the diffuser pipe can use synthetic resin pipes such as PVC, and the weight can be reduced.
[0015]
In addition, when air is discharged (supplied) from a single blower to a plurality of aeration tanks, if the balance of the air discharge amount of each tank is lost, it becomes difficult to send air from the blower due to an increase in pressure loss. However, it is possible to prevent the blockage by balancing the air discharge amount by raising and lowering the diffused gas in each tank with a wire and adjusting the diffused water depth.
[0016]
Embodiment
An embodiment is shown in FIGS. 1 to 4, and in this embodiment, the diffused gas 10 is provided in a horizontal state along the bottom surface of the aeration tank 1 having a square shape in plan view. The diffused gas 10 is provided with a header pipe 12 in the longitudinal direction through support legs 13 in the middle in the short direction of the upper surface of the stationary frame 11 made of a grating frame-like grating in plan view, and the diffuser pipes 14 on both sides of the header pipe 12. Is provided. A riser pipe 15 made of a flexible hose is connected to one end of the header pipe 12, and air is sent from the blower (not shown) to the header pipe 12 and the diffuser pipe 14 via the riser pipe 15. The air is sent into the aeration tank 1 and aerated.
[0017]
Legs 20 are provided on the bottom surface of the four corners of the stationary frame 11 and other appropriate positions. As shown in FIG. 4, the leg 20 has a vertical screw rod 22 welded to the upper surface of a pedestal 21, the screw rod 22 is threaded through the stationary frame 11, and a nut 23 is screwed into the vertical surface. Yes, the length (length in the vertical direction) of the leg 20 is adjusted by adjusting the screwing amount of the screw rod 22. By this adjustment, the gap between the diffused gas 10 and the bottom of the aeration tank 1 is adjusted (leveling of the diffused water depth is performed). The screw rod 22 can be inserted into the stationary frame 11 so as to be movable up and down without being threaded, and can be fixed by fastening both nuts 23 and 23 at the required position. For this reason, “screwing” in the claims includes this aspect.
[0018]
Guides 2 fixed to the aeration tank are fitted in the four corners of the air diffuser 10 (stationary frame 11). The guides 2 extend over the entire length of the aeration tank 1 in the vertical direction. Further, wire ropes 3 are tied to the four corners of the stationary frame 11, and the wire ropes 3 are wound around the drums 4 at the four corners of the upper surface of the aeration tank 1 via pulleys 4a. The drums 4 on the same side are connected by a connecting rod 5, a drive unit 6 is connected to one end of one connecting rod 5, and the other ends of both connecting rods 5 are connected by a belt 6a. For this reason, when the driving machine 6 is driven, the four drums 4 are rotated synchronously via the connecting rod 5 and the belt 6a, and the wire ropes 3 are simultaneously pulled up and pulled back, and the air diffuser 10 (stationary frame) 11) moves up and down through the guide 2 while maintaining a horizontal state.
[0019]
As shown in FIG. 3, a support tool 30 that can be moved in and out is provided inside the aeration tank 1 at the four corners of the upper surface opening periphery and at appropriate positions on the periphery. The support 30 is an L-shaped fixing bracket 32 rotatably supported on a pedestal 31 fixed on the periphery of the upper surface of the aeration tank 1. As shown by a chain line in FIG. The diffused gas 10 is lifted by being submerged (retracted) outside the aeration tank 1 and positioned above the upper surface of the aeration tank 1, and the fixing bracket 32 is moved inward as indicated by the solid lines (a) and (b). The air diffuser (stationary frame 11) is placed on the fixture 32. In this state, maintenance or replacement of the diffused gas 10 is performed. When the operation is finished, the fixing fitting 32 is retracted by the reverse action, and the diffused gas 10 is lowered and positioned on the bottom surface of the tank.
[0020]
As shown in FIG. 5, the level of the diffused water depth is obtained by holding the header pipe 12 with a metal fitting 24, providing the metal fitting 24 with a screw rod 22 and a nut 23, and fixing the pedestal 21 to the stationary frame 11. As shown in FIG. 6, in the structure of FIG. 5, the base 21 may pass through the stationary frame 11 and be in contact with the bottom surface of the aeration tank 1. In this case, the header pipe 12 and the stationary frame 11 are always integrated at a separate position.
[0021]
In each said embodiment, it can replace with the wire rope 3 and can employ | adopt a chain (wire), and it can replace with raising / lowering of the wire rope 3 grade | etc., And can also be based on a crane. In addition, the riser pipe 15 may employ a rotary joint described in Japanese Patent Application Laid-Open No. 50-4853, etc., as long as the riser of the diffused gas 10 is absorbed instead of the flexible hose. obtain.
[0022]
Needless to say, the present invention can be applied to various types of aeration tanks such as a full aeration type, a semi-full aeration type, and a swirl flow type.
[0023]
【The invention's effect】
According to the present invention, since the diffused gas can be maintained on the upper surface of the aeration tank as described above, the workability is improved and the work space is not required separately. Further, since the gap between the diffused gas and the bottom of the aeration tank can be adjusted, the level of the diffused water depth can be easily obtained. Furthermore, since the diffused gas can be raised and lowered horizontally with the guide and the four wires, the raising and lowering action becomes smooth.
[Brief description of the drawings]
1A is a plan view of an embodiment, FIG. 1B is a front view of the same, FIG. 1C is a right side view of the same. FIG. 2 is a perspective view of the main part of the embodiment. The main part of embodiment is shown, (a) is a top view, (b) is a cut front view. FIG. 4 is a cut front view of a leg part of the embodiment. FIG. FIG. 6 is a cross-sectional view of the main part of another embodiment.
DESCRIPTION OF SYMBOLS 1 Aeration tank 2 Guide 3 Wire rope 4 Drum 5 Connecting rod 6a Belt 6 Driver 10 Air diffuser 11 Stationary frame 12 Header pipe 14 Air diffuser pipe 15 Riser pipe 20 Leg 21 Base 22 Screw rod 23 Nut 30 Support tool 32 Fixing bracket

Claims (3)

In the apparatus for raising and lowering the diffused gas, the diffused gas 10 is provided in a horizontal state along the bottom surface of the aeration tank 1, and the diffused gas 10 can be moved up and down in the horizontal state via the guide 2.
It is assumed that the diffused gas 10 is provided with a diffuser tube 14 on a stationary frame 11, and a support tool 30 that can be projected and retracted inward from the periphery is provided on the periphery of the upper surface opening of the aeration tank 1. The apparatus for raising and lowering the diffused gas in the aeration tank is characterized in that it is engaged with the lower surface of the stationary frame 11 in a protruding state to prevent the aeration tube 14 from descending. Legs 20 are provided at required positions of the diffused gas 10, the legs 20 are screwed into the diffused gas 10 in the vertical direction, and the screwing amount is adjusted to adjust the length of the legs 20 in the vertical direction with respect to the diffused gas 10. The apparatus for raising and lowering the diffused gas in the aeration tank according to claim 1, wherein the height is adjustable. The air diffuser 10 is formed into a square shape, wires 3 are attached to the four corners thereof, and the air diffuser 10 can be moved up and down in the horizontal state by simultaneously pulling and pulling back the wires 3 in the same amount. The raising / lowering apparatus of the diffused gas in the aeration tank of Claim 1 or 2 characterized by the above-mentioned.

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