JPS641036Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a scum removal device in a septic tank for removing scum generated in a settling chamber or the like.

[Background technology]

Conventionally, as shown in FIG. 1, a scum suction port 3 is provided at the upper end of one vertical pipe section 1 of a pipe bent in a U-shape to suck in scum floating on the waste water surface 2. Scum removal devices whose upper part is connected to a scum delivery pipe 5 are known. As shown in FIG.
Due to the pump action (so-called air lift pump action) caused by the rise of air,
The scum is sucked in from a scum suction port 3 located on the sewage surface 2 and sent out to a scum delivery pipe 5. In FIG. 1, the scum delivery pipe 5 is connected to a sludge return pipe 8, so that the scum generated in the settling chamber 9 is returned to the settling chamber 10 through the sludge return pipe 8. In Figure 1, 11 is an aeration room, 12 is a discharge pump room, and 13
is the disinfection room. By the way, in the conventional scum removal device, the U-shaped bent pipe is subjected to buoyancy during the water filling inspection process until the water level reaches the scum suction port 3, and a large moment acts on the X portion shown in Figure 2. In addition, after the water in the tank is removed for water filling inspection, water remains in the U-shaped bent pipe, and this also causes a large moment to act on the X part shown in Figure 2, making it susceptible to damage. It is something. Therefore, the strength of the portion X in FIG. 2 had to be made stronger than necessary, which also caused deformation and damage to the tank body itself. Another problem was that it took time and effort to drain the water remaining in the U-shaped pipe after the water filling test.

[Purpose of invention]

The present invention was devised in view of the above points, and its purpose is to prevent unnecessary moment from acting on the scum removal device during water filling inspection and when water is drained, and to simplify the structure of the mounting part. To provide a scum removal device for a septic tank, which can reduce the amount of water in a pipe and eliminate the trouble of draining water in a pipe during a water filling test.

[Disclosure of invention]

In the present invention, a scum suction port 3 is provided at the upper end of one vertical pipe section 1 of a pipe bent in a U-shape for sucking in scum floating on the wastewater surface 2, and the upper end of the other vertical pipe section 4 is provided with a scum suction port 3 for sucking scum floating on the waste water surface 2. A scum removing device connected to the pipe 5 and supplying air to the other vertical pipe part 4, sucking scum from the scum suction port 3 and sending it out to the scum delivery pipe 5 by a pumping action due to the rise of the air, A small hole 6 is bored in the bottom of a U-shaped tube, and with this configuration, the problems of the prior art are solved and the object of the present invention is achieved.

The present invention will be explained in detail below with reference to Examples. At the upper end of one of the vertical pipe parts 1 of the U-shaped bent pipe, there is provided a scum suction port 3 in the shape of a scum, and this scum suction port 3 is arranged so as to be approximately at the same level as the sewage surface 2. It is something that The upper part of the other vertical pipe part 4 is connected to a scum delivery pipe 5, and the lower part of the other vertical pipe part 4 is connected to an air pipe 7, forming a so-called air lift pump. A small hole 6 is bored in the bottom of the U-shaped tube.
This small hole 6 is, for example, about φ5, and the scum suction port 3
It is very small compared to the air lift pump, so it has almost no effect on the suction and delivery of scum by the air lift pump. The small hole 6 can be placed anywhere as long as it is at the bottom of the U-shaped bent tube, but the scum is removed if it is located farther away from the air outlet of the air tube 7 (that is, at the bottom on one side of the vertical tube 1). This is more preferable because the influence on However, when filling the tank with water for a water filling test, the water enters the U-shaped tube through the small hole 6, so it is not affected by buoyancy, and when the water is drained after the water filling test, water flows out from the small hole 6. Since it is pulled out, no extra gravity acts on it.

[Effect of idea]

As described above, in this invention, a small hole is drilled at the bottom of the U-shaped tube, so the small hole is drilled through the U-shaped tube during water filling inspection.
Water enters the U-shaped tube and buoyancy does not act on it, and when water is drained, the water in the U-shaped tube escapes through the small hole, so no extra gravity acts on the other side of the U-shaped tube. A large moment does not act on the upper part of the vertical pipe or the attachment part to the tank body, there is no need to reinforce the strength of this part more than necessary as in the past, and the tank body does not deform or break. It is something.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional septic tank (combined treatment septic tank), Fig. 2 is a perspective view of the same scum removal device as above, Fig. 3 is a sectional view of the bottom part of the scum removal device of the present invention, and Fig. 4 The figure is a perspective view of the same scum removal device as above, where 1 is the vertical pipe section, 2 is the sewage surface, and 3 is the vertical pipe section.
4 is a scum suction port, 4 is a vertical pipe portion, 5 is a scum delivery pipe, and 6 is a small hole.

Claims (1)

[Scope of utility model registration request] A scum suction port for sucking scum floating on the surface of the waste water is provided at the upper end of one vertical pipe part of the pipe bent in a U-shape, and the upper part of the other vertical pipe part is connected to the scum delivery pipe. This is a scum removal device that supplies air to the vertical pipe section and uses the pumping action of the rising air to suck in scum from the scum suction port and send it out to the scum delivery pipe.A small hole is bored in the bottom of the U-shaped pipe. A scum removal device for septic tanks consisting of