JPH056191U - Screen pump - Google Patents

Abstract

(57) [Summary] [Purpose] A screw pump that is effective for the transfer of a solution in which solids and fibrous impurities are mixed, and it can be configured with a small diameter to occupy a small area in the septic tank. To provide a screw pump suitable for transferring wastewater in a small combined treatment septic tank. [Structure] A suction port 2 is provided at the lower end and a discharge port 3 is provided at the upper end.
A rotary shaft 5 driven by a prime mover 4 is inserted into a cylindrical casing 1 having a screw blade 6 made of an elastic material such as rubber on the outer periphery thereof, and an outer edge of the screw blade 6 is provided. The part is configured to be in watertight contact with the inner peripheral surface of the cylindrical casing 1. By driving the prime mover 4, the outer peripheral edge of the screw blade 6 is rotated by its elasticity while maintaining a close contact with the inner peripheral surface of the cylindrical casing 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an extremely small screw pump used for transferring wastewater in a small combined treatment septic tank or the like.

[0002]

[Prior Art]

 Conventionally, in large septic tanks and sewage treatment facilities, centrifugal pumps are often used to transfer sewage from one tank to another tank that moves to the next process.

It is well known that a screw pump is generally suitable for transferring a slurry solution containing a mixture of solids and a liquid having a relatively high viscosity. However, in the conventional screw pump, as shown in FIG. 3, a slight gap g is formed between the outer edge portion of the metal screw blade 6'and the inner peripheral surface of the cylindrical casing 1 ', and thus the watertightness is improved. Since it is not held, a loss is generated and a sufficient liquid transfer capacity cannot be ensured. To compensate for this loss, the blade diameter of the screw blade 6'and the cylindrical diameter of the cylindrical casing 1'must be increased. However, the area occupied by the screw pump in the tank increases, resulting in a reduction in the effective volume in the tank. In addition, a large motor is required as the prime mover, which increases equipment costs and running costs. For that reason, the centrifugal pump is frequently used as described above.

[0004]

[Problems to be solved by the device]

 Recently, attention has been paid to a very small combined treatment septic tank having 5 to 10 person tanks, but a transfer amount of about 1 to 3 l / min is appropriate for such a very small septic tank.

As described above, the amount of sewage transferred from one tank to another tank in the next step must be commensurate with the treatment capacity of the next step in the other tank. Therefore, if a centrifugal pump is used, it must be a very small one, but solid substances and fibrous impurities are mixed in the septic tank. Originally, the centrifugal pump is apt to be clogged with solid substances and fibrous impurities due to its structure, and if it is small, it is more likely to be clogged.Therefore, a small centrifugal pump can be used to transfer a slurry solution containing these impurities. Is not appropriate to use. Moreover, it is not appropriate to mount a conventional screw pump, which requires a large occupied area, in a small septic tank.

The object of the present invention is effective for transferring a solution in which solid substances and fibrous impurities are mixed, and can be configured to have a small diameter to occupy a small area in a septic tank, thus providing a compact combined treatment. An object of the present invention is to provide a screw pump suitable for transferring dirty water in a septic tank.

[0007]

[Means for solving the problem]

 In the screw pump according to the present invention, the suction port is opened in the lower end direction of the cylindrical casing, and the discharge port is opened in the upper end direction, and the rotary shaft driven by the prime mover is inserted into the cylindrical casing and the outer periphery thereof is inserted. In a screw pump in which screw blades are screwed in, the screw blades are made of an elastic material such as rubber so that the outer edge portion thereof is in watertight contact with the inner peripheral surface of the cylindrical casing.

[0008]

[Action]

 When the screw pump of the present invention is used, the prime mover is driven with the suction port opened to the lower part in one tank and the discharge port opened to the upper part in the other tank. When the prime mover is driven, the rotating shaft rotates, and the outer peripheral edge of the screw blade rotates due to its elasticity while maintaining close contact with the inner peripheral surface of the cylindrical casing, mixing the liquid in one tank. Along with the contaminants, it sucks from the suction port in the lower end direction, lifts the liquid, and transfers it from the discharge port in the upper end direction into another tank.

[0009]

【Example】

 Hereinafter, description will be given with reference to the drawings of the embodiments.

Reference numeral 1 is a cylindrical casing made of synthetic resin or metal, 2 is a suction port opened in the lower end direction of the cylindrical casing 1, and 3 is a discharge port opened in the lower end direction. 4 is a prime mover such as a gear motor, 5 is a rotating shaft inserted in the cylindrical casing 1, 6 is a screw blade screwed around the outer periphery of the rotating shaft 5, the outer edge of which is the cylindrical casing 1. It is made of an elastic material such as rubber so that it slides in watertight contact with the inner surface. Reference numeral 7 is a support structure for adjusting the holding angle of the cylindrical casing 1 to an arbitrary angle.

When installing the screw pump in the small-sized combined treatment septic tank in the above embodiment, the installation angle of the cylindrical casing 1 in one tank 8a is arbitrarily adjusted by the support structure 7, and the suction port 2 is When the prime mover 4 is driven with the discharge port 3 opened in the lower part of one tank 8a and the discharge port 3 opened in the upper part of the other tank 8b, the rotating shaft 5 is rotated and the outer peripheral edge of the screw blade 6 is rotated. Due to its elasticity, it rotates while maintaining a close contact with the inner peripheral surface of the cylindrical casing 1. Therefore, an action is performed in which the undiluted sewage liquid in one tank 8a is sucked together with impurities from the suction port to be pumped up, and is discharged from the discharge port 3 and transferred into the other tank 8b for performing the next step such as aeration treatment. . Since the inner peripheral surface of the cylindrical casing 1 and the outer peripheral surface of the screw blade 6 are kept in close contact with each other, no liquid loss occurs and liquid delivery efficiency is extremely good. Further, by changing the holding angle of the casing 1, it is possible to adjust the transfer amount of the dirty water from the one tank 8a to a value corresponding to the processing capacity of the next step in the other tank 8b.

[0012]

[Effect of the device]

 The centrifugal pump of the present invention is different from the generally used centrifugal pump and is effective for transferring a solution containing a mixture of solid matter and fibrous impurities, and the outer peripheral edge of the screw blade 6 is inside the cylindrical casing 1. Since it is in watertight contact with the surrounding surface, it does not cause loss, and it can be constructed with a smaller diameter than conventional screw pumps, so the area occupied in the septic tank is small and the wastewater transfer in a small combined treatment septic tank Suitable for In addition, the motor used as the prime mover 4 needs to be small in size because it can be configured to have a smaller diameter than the conventional screw pump, and there is an advantage that the equipment cost and running cost can be kept low.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a main part of a screw pump according to the present invention.

FIG. 2 is an explanatory view illustrating a usage state of the screw pump of the present invention.

FIG. 3 is a vertical sectional side view of a main part of a conventional screw pump.

[Explanation of symbols]

 1 Cylindrical casing 2 Suction port 3 Discharge port 4 Motor 5 Rotating shaft 6 Screw blade

Claims (1)

[Claims for utility model registration] A suction port (2) is opened in the lower end direction of the cylindrical casing (1), a discharge port (3) is opened in the upper end direction, and a rotary shaft (5) driven by a prime mover (4) ) Is inserted into the cylindrical casing (1) and screw blades (6) are provided on the outer periphery thereof.
In a screw pump in which the screw is installed, the screw blade (6) is made of an elastic material such as rubber, and its outer edge portion is in watertight contact with the inner peripheral surface of the cylindrical casing (1). Characteristic screw pump.