JPS638473Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an aeration device, and in particular to an aeration device that is installed in a pit for treating highly concentrated sewage (e.g. household excreta, etc.) to effectively treat a wide area. It is something.

If a mixed liquid of excreta (liquid to be treated) such as household waste is left as it is in an underground treatment tank or an above-ground tank for a long time, transpiration will occur from the surface of the liquid, and a thick layer of dehydrated scum will form on the surface of the liquid. It is formed. The liquid below the surface also has poor fluidity.

For this reason, conventionally, as a sewage treatment device, an aeration device is installed in a pit, air is sucked into the sewage water, and the sewage is purified using oxygen in the air.

Conventionally, a nozzle that opens into the air chamber either directly at the discharge port of the pump or via an upright bent pipe is provided, and an air introduction pipe and a diffuser are connected and installed in the liquid to be treated, allowing the pump to release the air. An aeration charge is provided that produces a jet stream of water. However, in these conventional submersible aeration devices, the pump and ejector are fixedly connected, and in order to change the direction in which air water is ejected from the ejector, the submersible motor pump and ejector must be connected together. Must be. Therefore, in practice, the direction of the air and water fountain in the aeration device installed at the bottom of the sewage treatment tank is fixed, and the entire device must be moved in order to obtain the optimum aeration direction. However, depending on the shape and size of the aeration tank, it is not possible to orient the underwater aeration device in any direction. In this way, in conventional aeration equipment, the aeration jet direction is constant, so the scum generated in the aeration tank remains in the liquid with poor fluidity, and it takes a long time to process the parts that are less affected by aeration. In extreme cases, untreated liquid may remain permanently in a part of the aeration tank.

This idea has been developed by installing piping between the submersible motor pump and the ejector so that the nozzle jet direction can be freely controlled, thereby making it possible to aerate the liquid to be treated, which has a high concentration of scum and has a low water content. The purpose is to provide a device.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view of the aeration device, and FIG. 5 is a plan view of FIG. 1.

A submersible motor pump, which is installed at the bottom of a pit tank for treating liquids such as sewage, and is shown as a whole by 1, has a motor 2 at the top and an intermediate casing 4 fixed to a lower bracket 3 of the motor 2 below. is provided with a shaft sealing device (not shown), and a semi-open impeller 6 is fixed to the end of the main shaft 5 through which the shaft sealing device is inserted, and the impeller 6 is housed in a casing 7 fixed to the intermediate casing 4. A suction port 9 is provided in the casing 7 at a space 8 from the front surface of the open side of the impeller 6. Legs 11 are integrally provided in the casing 7 to support the submersible motor pump 1 and to form a flow path in front of the suction port 9. The space 8 and its outer periphery serve as a vortex chamber, and the vortex chamber is connected to the discharge port 12. A pump configured in this manner is called a vortex pump.

A flange 13d at one end of a bent pipe 13, which is an integrated horizontal pipe 13a and a vertical pipe 13b connected at a bent portion 13c, is fixed to the discharge port 12 of the pump casing in contact with the discharge port 12. A short bent pipe 14 is connected to the other end of the bent pipe 13, and the bent pipe 13 and the short bent pipe 14 are connected by a rotatable connecting part 15 so that the outlet side of the short bent pipe 14 facing in the horizontal direction is vertically connected to the bent pipe 13. It is attached with the center of the direction tube 13a as the center of rotation.

FIG. 2 is an enlarged view of the connecting portion 15. The end of the vertical tube 13b is provided with a flange 13e, and the cylindrical convex portion 14b of the flange 14a at one end of the short tube 14 is fitted into the cylindrical concave portion 13f provided on the flange 13e, so that the flange 13e is rotatably fitted. 13e,
14a has eight common bolt holes 16 equally spaced on a common circumference, as shown in FIG. 3 of the plan view of FIG. 2, and bolt nuts 17 are inserted through the bolt holes 16. The bent pipe 13 and the short bent pipe 14 can be fastened together at the flanges 13e and 14a. Therefore, in the case where there are eight bolt holes 16 in the above example, the liquid outlet side of the short bent pipe 14 can be installed with the direction rotated by 45 degrees. Then, the short bent pipe 1 is connected to the direction D of the horizontal pipe 13a.
The outlet 18 of No. 4 can take a position forming an angle of θ=8 degrees as indicated by arrow E. The meaning of this angle θ will be described later. Arrow E
In the direction of , the adjacent bolt holes 16
e, is on the bisector of the angle extending to the center o of 14a.

FIG. 4 is a plan view of FIG. 2, showing the bolt holes 16.
This is another example of the arrangement of the bolt holes 16. In this embodiment, the circumference is divided into 24 equal parts, and the angle θ between the direction D indicated by the arrow of the horizontal tube 13a and the arrow E indicating the direction of the outlet 18 of the short bent tube 14 is 7.5 degrees, and the angle θ is 7.5 degrees. is on the bisector of the angle between the adjacent bolt holes 16 and the aforementioned center o. Reference numeral 19 is a leg fixed to the bent portion 13c of the bent pipe 13, and is used to keep the aeration device at the bottom of the tank together with the leg 11 of the pump.

The ejector, generally designated 21, has a nozzle 22 for spouting liquid supplied from the submersible motor pump 1.
Flange 23 and air chamber 31 on the outlet side of the short bent pipe 14
is clamped and fixed to a nozzle casing 24 equipped with
A diffuser 25 is fixed to the nozzle casing 24 so as to extend straight through the nozzle casing 24 and recover the pressure of the velocity energy of the liquid injected from the nozzle 22 .

The tip of the ejector 21 may be fixed to the aeration tank with a fixing device such as a tension wire (not shown). Further, an air introduction pipe 27 through which a gas such as the atmosphere is introduced is fixed to the nozzle casing 24 and opens into the air chamber 31, and the pipe extends upward and opens into the atmosphere. Further, a muffler 29 is provided at the opening in the atmosphere.

When the motor 2 is started, the main shaft 5, and thus the impeller 6, rotates, and the planar shape projected on the page of FIG. 1 inside the impeller 6 is as follows. A vortex A centered on the extension of the main shaft 5 is generated, and the liquid sucked in from the suction port 9 is directed from the volute chamber toward the discharge port 12 while being spirally wound.

The liquid flowing out from the discharge port 12 is directed vertically upward by the curved pipe 13, flows horizontally again through the short curved pipe 14, is injected into the air chamber 31 by the nozzle 22, and is then blown into the straight section of the diffuser 25. It contacts the inner wall 25' of the tube. As a result, air is sucked through the air introduction pipe 27 and comes into contact with the surface of the injected liquid, gradually narrowing the air passage 31', tangentially bringing the inner wall and liquid together, and then the velocity energy is recovered to pressure. It flows out from the differential user 25. At this time, as a result of the action of the vortex pump, the liquid flowing out from the discharge port 12 crosses or intersects the extension of the main shaft 5; The water flow is given a twist as it rotates around the center. Therefore, the nozzle 22, the air chamber 3
1. As a result of twisting the water flow with the diff user 25 and giving a gentle swirling flow, the nozzle 2
The liquid injected from the diffuser 2 contacts the inner wall 25' of the straight pipe of the diffuser 25 while swirling.
Since the contact area with the air is increased and the straight pipe section of the diff user 25 is also swirled, the same effect as when the straight pipe section is made longer is obtained, and the amount of air taken in is reduced accordingly. The increased and inhaled air moves toward the center of the pipe, and the journey for the air bubbles to become finer becomes longer, resulting in a large amount of finer air bubbles, which is favorable for the purification effect of sewage. .

In this way, aeration is performed in the aeration tank, and the bolts and nuts 1 of the connecting portion 15 between the curved pipe 13 and the short curved pipe 14 are
7 is removed, the ejector 21 is rotated around the vertical pipe 13b of the bent pipe 13 to determine the direction, and the bent pipe 13 and the short bent pipe 14 are fastened with the bolts and nuts 17.

As shown by the solid line in FIG. 5, the ejector 21 can take a position facing near the outer circumferential direction of the motor 2. That is, if the angle between the horizontal pipe 13a and the ejector 21 is θ from the common bolt hole of the flanges 13e and 14a of the connecting portion 15, which have already been explained, the jet of air water coming out of the differential user 25 will pass near the outer periphery of the motor 2. ing. As a result, the filth in the wastewater that tends to adhere to the outer periphery of the motor 2 is washed away.

In the case of the arrangement of the bolts 16 of the connection part 15 as shown in FIG. The direction is changed each time, and aeration can be performed by directing the diff user 25 to a determined position over all 360 degrees. In the above embodiment, the direction of the ejector 21 can be rotated at intervals of the angle α, but if the ejector 21 can be rotated continuously, the adjustment can be made more finely, and the direction can also be changed from the top of the tank while it is installed at the bottom of the tank. It is preferable to do this.

FIG. 6 shows another embodiment of the connecting portion 15. A ball 32 is welded to the end of the vertical tube 13b, and the ball 32 is connected to a socket 34 having a cylindrical inner circumference 34a, which is welded to the end of the short bent tube 14 through a packing 33.
to be inserted into. The portion of the ball 32 that is in contact with the gasket 33 is a spherical surface. A retainer flange 35 is fitted into the socket 34, and the retainer flange 35
Insert the common bolt hole of the flange of the socket 34 and tighten the bolt nut 36 to tighten the gasket 33.
The ball 32 and socket 34 are fixed by pressing. This connection part is bolt nut 3
6, the short bent pipe 14 can not only be rotated 360 degrees in the horizontal plane, but also slightly adjustable in the vertical direction, allowing for even more effective aeration.

FIG. 7 is a longitudinal sectional view of still another embodiment of the connecting portion 15, and FIG. 8 is a sectional view taken along the line CC in FIG. A vertical tube portion 14c provided integrally with the short bent tube 14 rotatably slides into the vertical tube 13b.
A worm wheel 37 is fixed to the worm wheel 37, and the worm wheel 37 is housed in a gear box 38 fixed to the end of the vertical tube 13b. The worm 39 that meshes with the worm wheel 37 connects one end of the shaft neck to the gear box 38.
The worm 39
A square joint 43 fixed to the end of the center core 42 of the flexible shaft 40 is fitted into the square hole at the shaft end. The metal fitting 45 fixed to the tube 44 containing the core 42 of the flexible shaft 40 is secured to the cap nut 4.
6 into the screw at the end of the bearing 41, one end of the flexible shaft 40 is attached to the connecting portion 15, and the other end of the flexible shaft 40 is similarly attached to the case 47 of the ground operating device shown in the plan view in FIG. . In the case 47, a worm 48 is supported by the case 47 and the bearing 41.
is connected to the center core 41. A worm wheel 50, which is fixed to a shaft 49 supported by the case 47 and housed within the case 47, is engaged with the worm 48. The shaft 49 passes through the case 47, and a disk 52 having a pointer 51 attached to the outer end thereof is fixed thereto. A handle 53 is fixed to the worm 48.

A cover 54 is fitted into the short bent pipe 14 via a sealing ring 55 and is attached to the gear box 38 with machine screws 56.

The reduction ratio of the worm 39 and the worm wheel 37 is equal to the reduction ratio of the worm 48 and the worm wheel 50.

When the handle 53 is rotated, the worm 48 rotates, the central core 42 of the connected flexible shaft rotates, the worm 39 is further rotated, and the worm wheel 37 rotates to rotate the vertical tube portion 14c of the short bent tube 14. The short bent tube 14 rotates around the center to change the direction of the ejector 21. If the direction of the ejector 21 and the pointer 51 of the disc 52 are made to coincide, the worm wheel 50 rotates at the same angle as the worm wheel 37, so that the pointer 51 always indicates the direction of the ejector 21. Therefore, by fixing the case 47 on the ground, the direction of the ejector 21 can be changed without draining the feces from the aeration tank and disassembling the connecting portion 15. The handle 53 may be replaced with an electric motor, and the electric motor may be program-controlled.

In environments with highly scum and low moisture content, an aeration device that blows out forcefully in only one direction will waste time crushing the scum, making it impossible to achieve the goal of efficient (energy-saving) manure treatment. In this invention, since the ejector can be directed in any direction, excrement treatment can be suitably carried out in an underground treatment tank or an above-ground tank where a thick scum tank is formed on the surface.

In addition, if the liquid to be treated has a high concentration and convection on the outside of the submersible motor is insufficient, excrement adheres to and accumulates on the outer wall of the motor, obstructing the motor's heat dissipation, and conversely acting as a heat insulating material inside the motor. Heat accumulation may progress and cause motor failure (burnout), in which case U
If the direction of the ejector is set at a position where the ejector intersects the outer wall of the motor in a tangential direction in a turn shape, it will perform a cooling function for the motor and contribute to the safety of the equipment.

If the joint between the bent pipe and the short bent pipe is made into a swivel joint so that it can be driven from the ground, the ejector can be rotated while the aeration device is aerating at the bottom of the tank, making the operation easier. Furthermore, by automatically driving the connecting part from the ground, the ejector can be rotated continuously or intermittently, and aeration air can be sent throughout the liquid to be treated in the aeration tank, making scum crushing extremely effective. Manure can be disposed of efficiently.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of an embodiment of this invention, Figure 2 is a partially enlarged view of Figure 1, Figures 3 and 4 are plan views of Figure 2, and Figure 5 is a view of Figure 1. Plan of Figure 6
The figure is a longitudinal cross-sectional view showing another embodiment of the connecting portion, and FIGS. 7 to 9 are views showing other embodiments of the ejector rotation device. FIG. C- in the diagram
C sectional view and FIG. 9 are plan views showing a partial cross section of the ground operating device. 1... Submersible motor pump, 2... Motor, 3...
...Lower bracket, 4...Middle casing, 5...
...Main shaft, 6... Impeller, 7... Casing, 8...
... Space, 9 ... Suction port, 11 ... Leg, 12 ... Discharge port, 13 ... Bent pipe, 13a ... Horizontal pipe,
13b...Vertical tube, 13c...Bent part, 13
d...Flange, 13e...Flange, 13f...
...Cylindrical concave part, 14...Short bent pipe, 14a...Flange, 14b...Cylindrical convex part, 14c...Vertical pipe part, 15...Connecting part, 16...Bolt hole, 17...
...Boltnut, 18...Exit, 19...Legs, 2
1... Ejector, o... Center, D... Direction, E...
...Arrow, 22...Nozzle, 23...Flange, 2
4...Nozzle casing, 25...Diffusion user, 25'...Inner wall, 27...Air introduction pipe, 28
...gate valve, 29...muffler, 31...air chamber,
31'... Passage, 32... Ball, 33... Packing, 34... Socket, 35... Retainer flange, 36... Bolt nut, 37... Worm foil, 38... Gear box, 39... Worm, 4
0... Flexible shaft, 41... Bearing, 4
2... Core, 43... Square joint, 44... Tube, 45... Metal fitting, 46... Cap nut, 47...
Case, 48...Worm, 49...Shaft, 50...
... Worm foil, 51 ... Pointer, 52 ... Disc, 53 ... Handle, 54 ... Cover, 55 ...
...Sealing ring, 56...Machine screw.

Claims (1)

[Scope of utility model registration request] In the liquid to be treated, it consists of a pump to be driven and an ejector connected to the pump, the ejector being formed to cover a nozzle to which the liquid from the pump is supplied and the nozzle to emit gas. A nozzle is constructed of a nozzle casing having an air chamber with an air introduction pipe opened therein, and a diffuser through which the liquid ejected from the nozzle passes, and the nozzle ejects between the pump discharge port and the nozzle casing. A submersible aeration system in which a nozzle is rotatably adjusted around a vertical pipe in a direction perpendicular to the direction, and piping including the vertical pipe is connected so that the nozzle jet direction can be freely changed.