JPH075280Y2 - Clear water discharge pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a supernatant water discharge pump used in a batch type wastewater treatment tank.

[Prior art and its problems] Conventionally, the discharge of the supernatant water after the aeration / precipitation process in the batch-type sewage treatment tank has been performed by a natural flow-down method using a water collection trough, so that it takes a long time to complete the discharge. Is very inefficient.

It is also practiced to use a floating material suction pump to discharge the supernatant water, but at the end of the discharge, the lower part of the water intake port is likely to entrain sedimented sludge near the interface, and clear supernatant water may be discharged. It was considered difficult.

[Object of the Invention] An object of the present invention is to provide a supernatant water discharge device in which supernatant water is discharged by forced discharge in a short time and sludge is unlikely to be mixed in at the end of discharge.

[Structure of the Invention] In the supernatant water discharge pump according to the present invention, a vertical water passage is provided above a cylindrical float chamber that is erected so as to communicate with the side-opening pump suction port in an orthogonal manner. A water inlet having a narrow upper and lower width is opened in the circumferential direction from the vertical hole-like water inlet,
The water intake port is opened below the water surface in the batch type waste water treatment tank above the sludge interface, and the float chamber accommodates a float so that the float chamber can be separated from and contact with the lower edge of the vertical water passage port. However, when the pump is in operation, the suction force causes the float to separate from the lower edge of the vertical water passage opening the water passage from the water intake port to the pump suction port, and when the pump is stopped, the float floats up due to its buoyancy and the vertical hole passage. The water passage is configured to be closed by contacting the lower edge of the water passage.

[Embodiment] In the drawings of the embodiment, 1 is a side opening type pump suction port, 2
Is a cylindrical float chamber standing upright so as to communicate with the pump suction port 1 at right angles, 2h is a vertical water passage hole drilled above the float chamber 2, and 3a is an extension of the vertical water passage port 2h. A collar body 3b is provided on the collar body 3a, and a lid body is horizontally attached to the collar body 3a with a slight distance between the collar body 3a and the lid body 3b. The narrow water inlets 5 are spherical floats accommodated in the float chamber 2 so that they can be separated from and contact with the lower edge of the vertical water passage 2h by the lifting operation.

When the pump of the present invention is installed in the sewage treatment tank, it is adjusted so that the water inlet 4 opened below the water surface is located above the sludge interface 6 formed between the settled sludge and the supernatant water. It should be, for example, a floating system by the float 7 or the like is suitable.

When the pump is in operation, the suction force of the float 5 separates the float 5 in the float chamber 2 from the lower edge of the vertical water passage 2h to form a water passage 8 from the water suction port 4 to the pump suction port 1. The supernatant water sucked from the narrow water suction port 4 is discharged from the water discharge passage 8 through the pump swirl chamber 9 to the outside through the pump discharge port 10. Further, when the pump is stopped, the float 5 in the float chamber 2 floats by its buoyancy and contacts the lower edge of the vertical water passage 2h, so that the water passage 8 leading to the pump suction port 1 is closed and the backflow prevention function is achieved. Will work.

[Effect of the Invention] By using the pump of the present invention, the supernatant water after the aeration / precipitation step in the batch type sewage treatment tank is carried out in a short time by forced discharge. Further, the water intake 4 in the pump of the present invention has a narrow upper and lower width between the facing surfaces of the collar body 3a and the lid body 3b. Has the advantage that it can be continuously discharged.

[Brief description of drawings]

1 is a vertical sectional side view of a main part of a supernatant water discharge pump according to the present invention. FIG. 1 shows a state in which a float is lowered by driving the pump, and FIG. 2 shows a state in which the float is raised by stopping the pump. 1 ... Pump suction port, 2 ... Float chamber, 2h ... Vertical water inlet, 4 ... Water inlet, 5 ... Float, 6 ... Sludge interface, 8 ... Water passage.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-53-122247 (JP, A) Actually opened 60-35971 (JP, U) Actually opened 52-72903 (JP, U) JP-B 56- 47804 (JP, B2) Actual public 51-36247 (JP, Y2) Actual public 57-6791 (JP, Y2) Actual public 61-19769 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A vertical water passage (2h) is bored above a cylindrical float chamber (2) standing upright so as to communicate with the side-opening pump suction port (1) at a right angle, and the vertical hole is formed. The water suction port (2) is formed in the circumferential direction so as to have a narrower vertical width than the water flow port (2h), and the water suction port (4) is below the water surface in the batch type waste water treatment tank rather than the sludge interface (6). The float (5) is housed in the float chamber (2) so that the float chamber (2) can be separated from and contact with the lower edge of the vertical water passage (2h) by the raising and lowering operation. The float (5) is separated from the lower edge of the vertical water inlet (2h) to open the water passage (8) from the water inlet (4) to the pump inlet (1), and when the pump is stopped, the float (5) is opened. Is floated by its buoyancy and comes into contact with the lower edge of the vertical water passage (2h), so that the water passage (8) is A supernatant water discharge pump characterized by being configured to be closed.