JPH0569598B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides for a submersible pump installed in a tank body to remove a barrier around the suction port of the submersible pump before discharging supernatant wastewater from the tank body. The present invention relates to a sewage purification device that first discharges the accumulated sludge on the flow plate and then discharges the supernatant sewage.

[Prior Art] As shown in Fig. 6, a conventional sewage purification device of this kind has a submersible pump C installed on a pedestal B provided on the inner bottom surface of a tank body A, and a submersible pump C installed around the suction port of the submersible pump C. It is known that the baffle plate 2 is formed in a curved shape so that the top surface of the baffle plate 2 faces the distal end outlet of the air lift.

[Problems to be Solved by the Invention] In order to drain sewage using the conventional device described above, first, only the air lift is operated for a short period of time to completely discharge the sludge that has accumulated on the baffle plate. After that, the pump is operated to discharge the supernatant wastewater. In other words, the air lift and the pump are used together, which has the drawback of making the device complicated and increasing the cost.

Therefore, the object of the present invention is to discharge the accumulated sludge on the baffle plate and the supernatant sewage inside the tank using only a pump, thereby simplifying the device and reducing the cost. be.

[Means for Solving the Problems] The present invention for achieving the above object includes a submersible pump that is inserted into a tank body and discharges supernatant wastewater from the tank body to a post-treatment tank, and a suction pump for the submersible pump. a baffle plate formed around the mouth to prevent sludge settling at the bottom of the tank from flowing into the suction port;
In a purification device comprising a return means for returning the sludge accumulated on the baffle plate to the front treatment chamber, the submersible pump serves both the return means and the function of discharging supernatant sewage. In order to achieve this, the pump's drainage system is provided with a switching valve for discharging the sludge to the front treatment chamber and the supernatant sewage to the rear treatment chamber.

[Example] In Fig. 1, reference numeral 1 denotes a tank body constituting a wastewater purification treatment device, and this tank body 1 is composed of a large number of treatment chambers 2 that communicate with each other from the front end inlet side to the rear end outlet side. A submersible pump 4 supported by an elongated cylindrical pump holder 3 is inserted into a predetermined processing chamber 2.

At the upper end of the discharge pipe 5 that communicates with the submersible pump 4, there is a pipe 6 for returning sludge, one end of which communicates with the front processing chamber of the processing chamber where the pump 4 is located, and a rear part of the processing chamber where the submersible pump 4 is located. A pipe 7 for supernatant wastewater, one end of which communicates with the treatment chamber, is connected to a three-way switching valve (electromagnetic type).
They are connected to each other via 8.

A large number of water holes 3a are provided on the outer periphery of the lower end of the pump holder 3, and a baffle plate 3b is formed around the water holes 3a and the suction port of the pump 4.

[Operation] First, the switching valve 8 is switched to the pipe 6 side for a short time, and when the pump 4 is driven in this state,
The sludge remaining on the baffle plate 3b is sucked in, and this sludge is returned to the front treatment chamber for reprocessing through the pipe 6. After that, the switching valve 8 is switched to the pipe 7 side at an appropriate time. is switched, which in turn causes
The supernatant wastewater is discharged through a pipe 7 to a rear treatment room such as a disinfection room.

Therefore, the pump holder 3 in this embodiment
is supported by the tank body 1 as follows. That is, the upper wall of the processing chamber 2, in this example, the manhole 9
A support wall 10 is horizontally extended on one side of the inside of the
A pump holder 3 is supported in a notch 11 provided in the support wall 10 by a fixing means 12 that can be operated to adjust its vertical position, and a pump 4 is fixedly supported on the bottom plate of the pump holder 3.

In this example, the fixing means 12 includes a flange plate 13 wider than the notch 11 in the pump holder 3.
Insert and tighten with screws 14, and this collar plate 13
is brought into contact with the upper surface of the support wall 10 in the form of a stopper, but the structure is not limited to this.

With the above configuration, the vertical position of the pump can be adjusted by vertically operating the pump holder 3 from outside the tank.

[Effects of the Invention] As described above, according to the present invention, the drainage system of the submersible pump switches and discharges the accumulated sludge on the baffle plate to the front treatment chamber and the supernatant sewage to the rear treatment chamber. Since a switching valve is provided, the sludge and supernatant sewage can be discharged by the switching operation of the switching valve.Therefore, there is no need to use an air lift as in the past. It requires only one submersible pump, making it possible to simplify the equipment and reduce costs, which is an extremely significant feature.

[Brief explanation of the drawing]

Figure 1 is a front view of the purifier, Figure 2 is a vertical cross-sectional view of the main parts of the same, Figure 3 is a plan view of the same, Figure 4 is a front view of the baffle plate, and Figure 5 is a view of the pump holder. FIG. 6, a longitudinal sectional front view of a portion of the fixing means, is an explanatory diagram of a conventional example. DESCRIPTION OF SYMBOLS 1...tank body, 3b... baffle plate, 4... submersible pump, 5, 6... return means, 8... switching valve.

Claims (1)

[Scope of Claims] 1. A submersible pump that is inserted into a tank body and discharges supernatant sewage from the tank body to a post-treatment tank; A purifier comprising: a baffle plate that prevents sludge from flowing into the suction port; and a return means that returns the sludge remaining on the baffle plate to the front treatment chamber. In order to use the submersible pump as both the return means and the discharge function of the supernatant sewage, the drainage system of the pump is switched to discharge the sludge to the front treatment chamber and the supernatant sewage to the rear treatment chamber. A sewage purification device characterized by being equipped with a switching valve.