JPH057888A - Aerating and agitating device - Google Patents

Abstract

PURPOSE:To improve the efficiency of the aerating and agitating device by using the device for aerobic and anaerobic operations, prolonging the service life of the sealing part and reducing the power. CONSTITUTION:A hollow shaft 2 with a screw 3 arranged at its lower end is directly connected to a hollow motor shaft 11. A control valve 5 for adjusting the air passage is furnished on the unloaded side of the motor shaft 11. A V-shaped seal is provided on the end face of the motor shaft 11 on the unloaded side to prevent the leakage between the shaft and the fixing-side member such as a motor casing. Further, a lip support also used for preventing the displacement of the seal is furnished on the motor shaft 11 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aeration and agitation device which effectively carries out low load operation and removal of nitrogen in wastewater at the start of aerobic and anaerobic service.

[0002]

2. Description of the Related Art At the time of aeration operation, the control valve is fully closed or close to fully closed to narrow down the ventilation amount.
An oil seal or the like is used between the motor shaft and the fixed parts such as the motor casing to prevent air from leaking.

[0003]

However, when the control valve is narrowed down, a negative pressure is generated in the hollow shaft, the surface pressure of the oil seal is increased, the wear of the shaft and the seal itself is promoted, and the power of the motor is increased. It was In the present invention, a V-seal is used, and by providing a protrusion on the outer circumference of the shaft on the seal lip side, it is possible to prevent the seal from being displaced in the axial direction by the negative pressure in the hollow shaft and to prevent the lip from being deformed to increase the contact area. The wear of the seal and the target parts has been reduced, and it has become possible to stop at a fixed amount, further reducing power consumption.

The present invention is a single self-priming aerator,
It is an object of the present invention to provide an aeration and agitation device which is commonly used for both anaerobic operation and has a long service life of a seal portion and reduced power, which is efficient and has excellent maintainability.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. A hollow motor shaft is directly connected to a hollow shaft having a screw at its lower end, and the motor shaft has an anti-load. In the aerator equipped with a control valve for adjusting the air flow rate on the side, a V-shaped seal is used as the seal between the motor shaft and the fixed portion, and further, there is an axial deviation on the outer circumference of the seal lip side, The gist is that a protrusion for holding the position is provided.

[0006]

When the control valve is throttled in the screw type self-priming aerator, even if the negative pressure generated in the hollow shaft is used, the V seal is used and a proper protrusion is provided on the outer circumference of the shaft, so that the V seal is attracted to the seal surface. Since it is possible to prevent the lip from being deformed and the sealing surface becoming large, the wear of the seal can be reduced and the wear can be stopped at a certain position. As a result, the life of the seal can be extended and the power can be reduced, and the aeration and agitation device is excellent in terms of maintenance management and running cost.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiments. As shown in FIG. 1, a screw type self-priming aerator A used for treating sewage such as sewage and industrial wastewater is a motor 1 and a hollow of a required length directly connected to a hollow motor shaft 11 of the motor 1. It is composed of a shaft 2, a screw 3 provided at the tip of the hollow shaft 2, a V-seal 4 provided on the opposite side of the motor shaft 11 and a control valve 5 for controlling the ventilation amount. Further, the outer periphery of the V-seal 4 of the motor shaft 11 on the lip side is provided with an appropriate protrusion for holding the axial displacement of the V-seal and the position of the seal lip.

The hollow shaft 2 has a required length and strength, and when the aeration device A is arranged in an aeration tank or a water channel so as to have a required penetration angle with respect to the sewage surface, a predetermined depth from the water surface. The length is appropriately determined so as to reach, and the screw 3 is fixed to the tip.

A motor shaft 11 of the motor 1 is connected to the base end side of the hollow shaft 2 via a shaft joint 6, and the screw 3 is rotated by the drive of the motor 1 via the hollow shaft 2 to remove waste water. so,
In addition, a negative pressure is generated in the water area at the tip of the screw, and this negative pressure is used to supply air as fine bubbles to the water area at the tip of the screw through the hollow motor shaft 11 and the hollow shaft 2. In this case, although not shown in the drawings, an electric control circuit may be provided in the motor 1 so that the rotation speed of the motor is controlled to adjust the rotation speed of the screw so that aeration and stirring can be adjusted.

The motor shaft 11 is rotatably supported by a casing 12 of the motor 1 via bearings 13, 13 and a ventilation pipe 7 is attached to the casing 12 by a seal ring 8.
And connect it to the outer circumference of the motor shaft 11 with V
A seal 4 is provided. Further, the outer periphery of the V-seal 4 of the motor shaft 11 on the lip side is provided with a protrusion for preventing the V-seal from being displaced in the axial direction and for holding the position of the seal lip. Further, a control valve 5 is provided on the ventilation pipe 7, and the control valve 5 is electrically operated to open and close to adjust the ventilation amount. The control valve 5 is set to have the ventilation amount set during the aerobic operation set at the previous time and can be adjusted according to the load, and is fully closed or close to the fully closed state during the anaerobic operation.

Therefore, in the apparatus constructed as described above, when the screw 3 at the tip of the rotating hollow shaft 2 driven by the motor 1 is submerged in water, it is directly connected to the hollow shaft by the negative pressure generated by the propelling force of the screw. Air is sucked in from the side opposite to the output shaft side of the hollow shaft of the motor and sent out into the water. The amount of air is adjusted by opening / closing the control valve 5 such as an electric ball valve provided on the intake side. At this time, the valve to be used may be manual, electric, or any model, and the aeration amount can be adjusted by adjusting the time schedule of the opening time and the closing time for a valve such as a solenoid valve whose intermediate opening and closing adjustment is difficult. Even when the valve is fully closed, the negative pressure in the hollow shaft can hold the position of the lip without shifting the V-seal, so that wear can be reduced. Further, the motor power can be suppressed.

[0012]

[Effects of the Invention] Even when the control valve is fully closed during anaerobic operation, the V seal can be prevented from shifting and the lip can be prevented from being deformed.
It is excellent in terms of maintenance and running costs.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an aeration and agitation device of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part.

[Explanation of symbols]

 1 Motor 11 Motor Shaft 2 Hollow Shaft 3 Screw 4 Micro Hole 5 Control Valve

Claims (1)

Claim: What is claimed is: 1. A hollow motor shaft is directly connected to a hollow shaft having a screw at a lower end thereof, and a control valve for adjusting an air flow rate is provided on an anti-load side of the motor shaft. In the aeration and agitation device, a V-seal is provided on the end face of the motor shaft on the side opposite to the load to prevent leakage between the shaft and fixed-side components such as the motor casing. An aeration agitator characterized by being provided.