JPH0742557Y2 - Air lift pump for septic tank - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an air lift pump for a sewage purification tank, and more particularly to an improvement of an air lift pump for advancing sewage.

[Conventional technology]

Usually, household wastewater purification tanks are combined with various treatment tanks such as a sedimentation separation tank for precipitating wastewater, an anaerobic treatment tank for treating wastewater with anaerobic microorganisms, and an aerobic treatment tank for treating with aerobic microorganisms. In that case, in order to enhance the denitrification effect, the treated water in the aerobic treatment tank is transferred to the next sewage treatment tank by using an air lift pump. It will be returned. This air lift pump pumps sewage into the target sewage treatment tank by the force of the air supplied into the pumping pipe, but in the past, to adjust the transfer rate at that time, the amount of air supplied was conventionally. Was adjusted, or it was adjusted by overflowing with a weighing box.

[Problems of conventional technology]

However, when adjusting the air supply rate, it is necessary to have a highly skilled technique for finely adjusting the transfer rate, and if the air supply rate increases for some reason, the transfer rate becomes excessive, which is an undesirable state. when,
Although it is easy to make fine adjustments, there are drawbacks such as installation restrictions due to the large weighing box.

[Problems to be solved by the device]

The present invention has been made in view of the above problems, and an object thereof is to provide an air lift pump for a sewage purification tank capable of adjusting the transfer rate of sewage with a simple and compact structure.

[Technology for solving problems]

That is, the air lift pump of the sewage purification tank of the present invention is an air lift pump that transfers sewage over the sewage treatment tank provided inside the sewage purification tank, and the top of the sewage treatment tank is higher than the water level in the sewage treatment tank. It has a pumping pipe that is exposed above and a horizontal pipe that is connected to the top part of this pumping pipe and is arranged toward the sewage treatment tank at the advection destination. A hollow body is provided on the top of the pumping pipe. In addition, a flow rate adjuster having a discharge port opened to the side surface and communicating with the horizontal pipe is screwed, and a scale for adjusting the screwing amount is provided on the pumping pipe. .

〔Example〕

 Next, an embodiment of this invention will be described.

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the embodiment, FIG. 3 is a front view of a flow rate regulator used in the embodiment, and FIG. 4 is a vertical sectional view of FIG. It is a figure.

The air lift pump 1 of the present invention is used, for example, in a small combined septic tank 2 as shown in FIG. 1, and this small combined septic tank 2 is allowed to settle and separate by allowing sewage to stand and to be treated with anaerobic microorganisms. Anaerobic filter tank first chamber 2A for performing, anaerobic filter tank second chamber 2B, contact aeration tank 2C for treating with aerobic microorganisms, and finally a sedimentation tank 2D for precipitating suspended sludge, and discharge It is equipped with a disinfection tank 2E for disinfecting the liquid, and the contact aeration tank 2C is equipped with an air lift pump 1, and this pump 1 transfers the wastewater treated in the contact aeration tank 2C to the anaerobic filter bed first chamber 2A. By doing so, the sewage is circulated in the small combined septic tank 2.

The air lift pump 1 is provided with a pumping pipe 1a provided with its top exposed above the water level in the contact aeration tank 2C, and an anaerobic filter tank at the advection destination connected to the top of the pumping pipe 1a. Horizontal pipe 1b arranged toward the first chamber 2A
And a scale for adjusting a screwing amount of a flow rate adjuster 4 having a hollow body at the top of the pumping pipe 1a and having a discharge port 3 communicating with the lateral pipe 1b on its side surface. 5 is provided in the pumping pipe 1a.

The flow rate controller 4 is made of a material having a high coefficient of friction such as rubber or resin, and the amount of screwing is adjusted by rotating the handle 6, so that the degree of overlap between the horizontal pipe 1b and the discharge port 3 (the discharge port is opened). The degree is changed. Therefore, the handle shaft
The rotation of 6A causes the flow rate regulator 4 to move up and down according to the pitch of the screw thread provided on the outer periphery, and the discharge port 3 is moved to the horizontal pipe 1b.
By stopping at the rotational position opened at, the flow rate can be adjusted according to the degree of overlap.

The degree of overlap is read on the scale 5. Further, the scale 5 is provided on the handle shaft 6A as shown in FIGS. 3 and 4, and is adjusted by the amount of insertion and withdrawal of the handle shaft 6A, and as shown in FIG. The configuration may be adjusted by the rotation angle of the handle 6.

[Action]

According to the above structure, when the flow rate adjuster 4 is rotated to change the screwing amount, the degree of overlap between the horizontal pipe 1b and the discharge port 3 is changed for each rotation of the handle shaft 6A, and the horizontal pipe 1b is overlapped. The opening degree of the discharge port 3 is adjusted, and the amount of sewage (transfer rate) that flows into the horizontal pipe 1b from the pumping pipe 1a via the flow rate adjuster 4 changes. Therefore, the flow rate can be adjusted to the target flow rate by rotating the flow rate regulator 4 while watching the scale 5 and selecting the opening degree.

In that case, since the flow rate is adjusted and limited by the opening degree of the discharge port 3 of the flow rate regulator, even if the air supply amount to the air lift pump 1 becomes excessive, the amount of dirty water flowing into the horizontal pipe 1b increases. There is nothing to do.

Further, by removing the flow rate regulator 4 from the pumping pipe 1a, the air lift pump 1 can be used as a sludge returning pump during backwashing.

〔effect〕

As described above, according to the present invention, by rotating the flow rate regulator screwed into the pumping pipe and adjusting the opening of the discharge port provided in this flow rate regulator, the transfer rate of sewage can be adjusted. Since it is controlled, the flow rate can be easily adjusted, and the structure is simple and compact. In addition, even if the amount of air supplied to the air lift pump increases, the transfer flow rate does not become excessive, and the pump can be utilized as a sludge return pump during backwashing, which is a practical effect.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the embodiment, FIG. 3 is a front view of a flow rate regulator used in the embodiment, and FIG. 4 is a vertical sectional view of FIG. FIG. 5 is a plan view of another embodiment. 1 ... Air lift pump, 1a ... Pumping pipe, 1b ... Horizontal pipe, 3 ... Sewage purification tank, 3 ... Discharge port, 4 ... Flow rate controller, 5 ... Scale

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Dai Harada, 2 Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture 1 Kubota Shiga factory (72) Creator Kazuyuki Honda 1 of 2 Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture Stock company Kubota Shiga Factory (56) References Actual Development Sho 58-156591 (JP, U) Actual Public Sho 34-10310 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. An air lift pump for advancing sewage over a sewage treatment tank provided inside a sewage treatment tank, wherein the top is exposed above the water level in the sewage treatment tank. Pumping pipe and a horizontal pipe connected to the top part of the pumping pipe and arranged toward the sewage treatment tank at the advection destination, with a hollow body on the top of the pumping pipe and a horizontal pipe on the side. An air lift pump for a sewage purification tank, wherein a flow rate controller having a discharge port communicating with is screwed in and a scale for adjusting the screwing amount is provided in a pumping pipe.