JPH0312393Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is used in the technical field of sewage treatment equipment.
In particular, the present invention relates to an underwater aeration device for purifying stored sewage.

(Prior art) Aeration equipment that supplies air into wastewater stored in a wastewater tank, stirs it, and purifies the wastewater through contact with oxygen in the air has been widely used in the past, and its predecessors As for the technology, multiple ejector mechanisms are provided radially at the discharge port of a submersible pump (for example, see Japanese Utility Model Publication No. 58-26079). (for example, see Utility Model Publication No. 60-17276), and a guide pipe for changing the direction of the water flow is placed in the wastewater, and an impeller, which is a water flow generator, is placed in the center of the guide pipe. There are also known devices (see, for example, Japanese Utility Model Application Publication No. 61-93896).

Each of the above aeration devices introduces air using negative pressure created by an ejector mechanism or a water flow generator, brings this air into contact with wastewater to aerate it, and uses the water flow to agitate the wastewater inside the sewage tank. It promotes aeration.

(Problem to be solved by the invention) However, all of the above submersible pumps have a vertical structure, and in order to cool these submersible pumps with waste water, the level of waste water in the sewage tank must be must be higher than the upper edge of the submersible pump. However, the higher the level of sewage water in a sewage tank, the more the amount and time of sewage retention increases, the more the sewage decomposes, and the more odor it generates.

On the other hand, the above-mentioned water flow generator housed in the center of the guide tube has a vertically long arrangement structure in which the prime mover is provided above the water flow generator at a distance, and the water flow direction is The guiding tube has a fixed depth and direction.

Therefore, in order to make the submersible pump smaller and to divert the water flow in a desired direction, there are still problems that need to be improved.

The present invention has been developed in consideration of the above-mentioned problems of the conventional technology.
Submersible pumps have a structure that allows them to operate even when the sewage water level in the sewage tank is kept low.In addition to introducing air into the sewage at a low water level, the submersible pump is equipped with a submersible aeration device that can change the direction of water flow up and down or back and forth. It is on offer.

(Means for solving the problems) Means for solving the above problems of the present invention are as follows:
The submersible pump is composed of a submersible pump and an ejector mechanism connected to the submersible pump, and the submersible pump has a pump body and a prime mover directly connected to the pump body, which are fixedly installed on a floor plate with the rotation axis oriented laterally, and The casing of the pump body is provided with an inlet on one side in the axial direction of the rotating shaft and at least one outlet in the lateral direction of the outer circumference, and the ejector mechanism includes a nozzle and an intake pipe. A diff user is connected to the air introducing body, and between the air introducing body and the discharge port, there is a curved pipe that makes the discharge direction of the diff user parallel to the longitudinal direction of the rotating shaft. The submersible pump and ejector mechanism are provided with adjustment means, and the submersible pump and ejector mechanism are fixed together with the floor plate at the deepest position of the tank body or the like.

(Function) The effect of the above means is that when the pressure water sent out from the discharge port of the submersible pump mixes with the atmosphere in the air introducing body and is ejected from the diffuser into the waste water, the waste water for cooling the submersible pump is Even if the water level is kept low, the stored sewage will be stirred parallel to the axial direction of the submersible pump.If the sewage water level is kept high, adjust the diff user to an appropriate elevation angle. It is possible to stir from the tank bottom to the water surface, and the volumetric sludge and the like at the tank bottom can be stirred by adjusting the diffuser to an appropriate depression angle, so aeration treatment over a wide range is promoted.

Furthermore, when the pump is provided with two discharge ports, more effective aeration processing can be performed by directing the discharge directions of the diffusers to opposite sides.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

The underwater aeration device 1 shown in FIGS. 1 to 3 is
It consists of a submersible pump 2 and a pair of ejector mechanisms 3a and 3b connected to the submersible pump.

The submersible pump 2 is horizontally formed,
A pump body 4 and a prime mover 5 such as a submersible motor directly connected to the pump body are fixed on a floor plate 7 via brackets 8 and 9 with the rotating shaft 6 facing in the horizontal direction.
In addition, the casing 10 of the pump body 4 has an inlet port 11 on one side in the axial direction of the rotating shaft 6, and discharge holes 12, 12 on opposite sides in the lateral direction of the outer circumference.
An impeller 13 is provided at the end of the rotating shaft 6 that projects into the casing 10. Reference numerals 14 and 15 indicate lifting fittings on which wire ropes, chains, etc. are hung when the underwater aerator 1 is transported.

The ejector mechanisms 3a and 3b are both formed in the same shape, and are provided with a nozzle 16 and an intake pipe 17, and a differential user 20 is connected to an air introduction body 19 in which a gas suction chamber 18 is formed. Between the air introducing body 19 and the discharge port 12, there are curved pipes 21 that direct the discharge directions of the differential users 20 to opposite sides and parallel to the axial direction of the rotating shaft 6, and are inclined toward the discharge port 12 side. An angle adjusting means 22 is provided.

The elevation angle adjusting means is the wide flange portions 23a, 23 of the irregularly shaped flange 23 provided on the discharge port 12 side of the bent pipe 21.
A plurality of through holes 24 are bored at equally spaced positions on the circumference centering on the discharge port 12 of a, while each through hole 24
A screw hole (not shown) is formed in the end of the pump body 4 corresponding to the center of the bolt 2, and one of the through holes 24 is fitted into the screw hole and fastened.
5.

The intervals between the through holes 24 are bored so that the differential user 20 can adjust the elevation angle in increments of, for example, 15 degrees, and the through holes 24 may be formed into arcuate long holes if necessary to adjust the elevation angle. It is also possible to make stepless adjustments.

The intake pipe 17 has intake ports 26 formed at the upper ends of the air introduction bodies 19, 19, respectively, and a large-diameter intake pipe 27 arranged above the level of the sewage water. connected to the rotating shaft 6
It is constructed by connecting a horizontal connecting pipe 28 disposed in a direction intersecting with the vertical connecting pipe 28 and a vertical connecting pipe 29 made of a flexible tube or the like installed upright in the middle of the horizontal connecting pipe. Further, the large-diameter intake pipe 27 can be located near a sewage water level, if necessary, to suck in scum floating on the water surface.

The above submersible pump 2 and ejector mechanism 3a,
3b is fixed together with the floor plate 7 to the deepest position of the bottom floor F of the tank body with bolts (not shown) or the like.

Note that the underwater aeration device 1 of this example has an ejector mechanism 3.
Although the differential users 20 a and 3b have their discharge directions facing opposite to each other, if necessary, the discharge directions of the differential users 20 may be parallel to each other and directed toward the same side.

Next, the operation of the above embodiment will be explained.

When the prime mover 5 is started and the sewage in the tank pressurized by the rotation of the impeller 13 is sent out from the discharge port 12 of the submersible pump 2, this pressurized sewage is compressed by the throttling action of the nozzle 16 of the air introduction body 19. Negative pressure is generated in the gas suction chamber 18, atmospheric air is sucked through the large-diameter intake pipe 27 by this negative pressure, and oxygen in the atmosphere is mixed with waste water and discharged from the diffuser 20. The accumulated sewage in the tank is agitated by the sewage discharged from the diffuser 20 in parallel to the axial direction of the submersible pump 2, thereby promoting aeration processing. At this time, since the submersible pump 2 is installed at a low height, a complete cooling effect can be performed even if the sewage water level is lowered to about 1/3 of the conventional level.

In addition, if the sewage water level is kept high, by adjusting the elevation angle of one differential user 20 and the depression angle of the other differential user 20, the aeration process can be performed vigorously over a wide range from the bottom of the tank to the water surface. It can be done.

(Effects of the invention) Due to the above-mentioned structure of the invention, the submersible pump is installed at a low height, so even if the water level of the sewage stored in the tank body is kept low during continuous operation, the cooling effect of the submersible pump is still low. Moreover, since the discharge direction of the diffuser is made parallel to the axial direction of the submersible pump and can be adjusted to the desired elevation angle, effective stirring action is carried out over a wide range from the bottom of the tank to the water surface. This method not only suppresses the generation of odor inside the tank, but also has the advantage of being simple in structure and easy to handle.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a front view of an underwater aeration device showing a part of the ejector mechanism in cross section, FIG. 2 is a plan view of the same, and FIG. 3 is an elevation view of one ejector mechanism. FIG. 2 is a side view of the underwater aeration device showing angle adjustment. 1... Submersible aeration device, 2... Submersible pump, 3
a, 3b...Ejector mechanism, 4...Pump body,
5... Prime mover, 6... Rotating shaft, 7... Floor plate, 10
...Casing, 11...Intake port, 12...Discharge port, 16...Nozzle, 17...Intake pipe, 19...
Air introducing body, 20... Diff user, 21... Bent pipe, 22... Elevation angle adjusting means, 23... Irregular flange, 23a... Wide flange, 24... Through hole, 25...
...Bolt, F...Bottom floor of the tank body.

Claims (1)

[Scope of utility model registration request] The submersible pump is composed of a submersible pump and an ejector mechanism connected to the submersible pump, and the submersible pump has a pump body and a prime mover directly connected to the pump body, which are fixedly installed on a floor plate with the rotation axis oriented laterally, and The casing of the pump body has an inlet on one side in the axial direction of the rotating shaft, and at least one inlet in the lateral direction of the outer circumference.
In the ejector mechanism, a diff user is connected to an air introduction body having a nozzle and an intake pipe, and between the air introduction body and the discharge port, a discharge direction of the diff user is arranged. A bent pipe parallel to the longitudinal direction of the rotating shaft is provided with an elevation adjustment means on the discharge port side, and the submersible pump and ejector mechanism are fixed together with the floor plate at the deepest position of the tank body or the like. An underwater aeration device characterized by: