JPH0599185A - Submerged pump with cutter for sewage pipe - Google Patents

Abstract

PURPOSE:To relieve an operation load by sucking a fibrous solid, mixed in a pump, as it is rolled in from the tip of an impeller and finely cutting the solid by a cutter blade in cooperation with an impeller to the front edge of which a cutting edge is formed, and an inner blade and a vortex-form blade positioned to a suction cover. CONSTITUTION:A horizontal type submerged pump for conveying sewage and sludge is formed such that an impeller 8 is mounted on a drive shaft 4 coupled directly to a motor in an outer box. Through rotation of the impeller, fluid sucked through a suction port 7 formed in the central part of the front of a casing 5 is discharged through a delivery port 9. In this case, a suction cover 6 at the front of the casing 5 has an inner surface positioned facing the impeller 8 and forming a conical surface 10 and an inner blade 14 having W-shaped arcuate notches 13 formed in spots in the inner periphery of the central part of the conical surface is formed. Vortex-form blades 16 are formed such that vortex-form recessed parts 15 spread in a comma-shaped from the inside toward the outside and recessed grooves 15a extending along the peripheries of the respective recessed parts are formed to form a vortex-form blade 16 in the three ways of the conical surface 10. Meanwhile, the impeller 8 is formed such that a cutting impeller having a cutting edge 22 and a helical vane 21 is integrally formed on the front edge of an pumping impeller 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a horizontal single-suction submersible pump for transporting sewage and filth mixed with fibrous foreign matter.

[0002]

2. Description of the Related Art Conventionally, submersible pumps have been used by submerging the entire pump together with the liquid in the liquid. It is used for sending and draining muddy water, sand, and gravel-containing water that is generated at civil engineering construction sites, and drainage in sewer pipes. A horizontal axis single-suction submersible pump is used for this purpose.

[0003]

However, such a horizontal shaft single-suction submersible pump is used at a place of use such as sewage in a sewage pipe or a sewage treatment plant where fibrous foreign matter is mixed into the treated water.
When used for transporting waste, fibrous solids, such as gloves, cloth, and underwear, are often mixed in the wastewater, and these are clogged in the pump, bitten into the impeller, and smooth discharge and In addition to hindering rotation, there are many cases in which expensive pumps cannot be used, such as pump rotation failure or damage due to increased resistance, motor burn-in, etc. There are also problems in terms of maintenance and work handling,
In addition, there is a problem that a good operating condition cannot be maintained for a long time.

In order to solve these problems, the present invention has a large passage cross-sectional area so that the fibrous solid matter can easily pass through when filthy water and dirt that are mixed with fibrous foreign matter are sucked in. The sewage treatment plant where the fibrous solid matter is cut and can be smoothly sent and drained, and foreign matter is mixed in,
It is an object of the present invention to provide a submersible pump for a sewer pipe with a cutter, which is suitable for transferring sewage and sewage in a human waste treatment plant or the like.

[0005]

To achieve the above object, a submersible pump for sewage pipe with a cutter according to the present invention has a motor 2 built in an outer case 1 and a drive shaft which is directly connected to the motor 2 for rotation. In a horizontal shaft single-suction submersible pump that suctions from a suction port 7 in the center of the front surface of the casing 5 by an impeller 8 attached to the casing 5, and sends and discharges water from a discharge port 9 through a drain pipe, the suction cover 6 on the front surface of the casing 5 is An inner surface facing toward the suction port side 7 is a conical surface 10, and an inner blade 14 is formed on all inner edges of a suction hole 11 having a W-shaped arc-shaped notch 13 at several central inner circumferences thereof. At the same time, on the three sides of the conical surface 10 around the conical surface, a vortex-shaped vortex recess 15 that extends from the inside to the outside and a groove 15a is formed along the periphery of the recess 15 in the inner periphery of the vortex. Forming blade 16 and impeller 8
Is a disc 25 at the rear of the boss 18 attached to the drive shaft 4,
A plurality of pumping impellers 20 curved in a spiral shape having a side edge blade 19 at a front edge contacting the conical surface 10 from a boss 18 on the front surface of the disk, and a boss from the center of the front edge of each pumping impeller 20. A cutting blade 22 that is inserted into the suction hole 11 toward the inside and is rotated by the inner blade 14, and a cutting impeller 23 having a spiral blade 21 are integrally provided, and the tip end outer peripheral portion of the boss 18 has an axial direction. A stirring blade 28 having irregularities is formed along the edges. The impeller 8 is divided into two or three pumping impellers 20 equally divided around the boss 18, and a cutting edge 22 is provided on the outer peripheral portion forming the step edge 21a from the front edge of each pumping impeller 20. The spiral blade 21 is formed toward the boss 18.

[0006]

This submersible pump is used for cleaning the inside of a sewer pipe, substituting it for replacement, and submerging it in the wastewater at a sewage treatment plant to generate a motor 2
When the impeller 8 is driven, the sewage is rotated by the impeller 8 including the cutting impeller 23 and the pumping impeller 20 that are integrally configured, and the casing 5 having a large passage cross-sectional area from the suction port is driven.
The air is sucked into the vortex chamber 12 inside, and is rotated by the impeller 8 to pass through the periphery of the vortex chamber 12 to be discharged and delivered to a predetermined position from a discharge port 9 through a drain pipe appropriately connected to the discharge port 9. When the solid matter and the foreign matter are mixed, the fibrous solid matter is sucked while being wound from the tip by the spiral blade 21 of the cutting impeller 23. At this time, the fibrous solid matter is provided in the suction hole 11. In the W-shaped arc-shaped notch 13, even a large solid matter is sandwiched and cut by the cutting blade 22 of the cutting impeller 23 on the front side of the impeller 8 which rotates and the suction hole 11 and the inner blade 14 of all inner edges of the notch 13. In addition, the conical surface 10 on the inner surface of the suction cover 6 has a tongue-shaped recess 15
Since the spiral blades 16 formed at the corners from the head side along the inner peripheral edge of the concave groove 15a are provided in a streamline shape with the diameter gradually increasing from the inner side to the outer side, the conical surface 10 is rotated. By meshing with the side edge blade 19 on the front side of the pumping impeller 20, the fibrous solid matter and impurities can be further finely cut and discharged together with the sewage to the discharge port 9. Further, the suction cover 6 has a conical surface 10 shape on the inner surface, and the impeller 8 is formed in a spiral shape by adding a step edge 21a to the front side edge of the pumping impeller 20 and a cutting impeller having a cutting edge 22 on its outer peripheral portion. In order to provide 23, a fibrous solid substance is also wound by the irregularities around the tip and spiral to facilitate the suction, and at the same time, the inner blade 14, the spiral blade 16 on the inner surface of the suction cover 6, and the impeller The eddy chamber 1 having a large passage cross-sectional area due to the inner surface shape of the suction cover
2 can be configured, so that the discharge can be facilitated without clogging.

[0007]

EXAMPLES Examples will be described with reference to the drawings.

In FIG. 1, 1 is an outer box containing a motor 2 in a single suction horizontal type submersible pump, 3 is a mechanical seal loading chamber having a shaft sealing portion 3a, 4 is a drive shaft directly connected to the motor shaft, and 5 is a drive shaft. A casing of the submersible pump, 6 is a suction cover connected to a suction port 7 attached to the front surface of the casing 5, 8 is an impeller attached to the drive shaft 4, 9 is a discharge port of the casing 5, and 12 is a swirl chamber. Reference numeral 27 denotes a negative pressure impeller attached to the drive shaft 4 between the mechanical seal loading chamber 3 and the rear end of the impeller 8 and having vanes toward the shaft water sealing mechanism, which prevents shaft leakage to the shaft water sealing mechanism side. It is a deterrent.

The discharge port 9 has a pipe mounting port 2
8 is provided, and an appropriate discharge pipe 29 is provided in parallel with the motor shaft.
Is connected to send and discharge sewage and waste to a required place. 30 is a caster for movement mounted on both sides of the outer circumference of the outer box 1 with a built-in motor and the mechanical seal loading chamber 3, and is mounted at an angle so as to match the inner diameter of the pipe so that movement in a narrow pipe can be performed smoothly. Set up.

2 to 3, the suction cover 6 has an inner surface facing the impeller 8 which is a conical surface 10 having a recessed central portion toward the suction port 7 side, and is mixed with sewage and dirt at the center thereof. A suction hole 11 having a relatively large diameter through which the fibrous solid material passes is provided, and the suction cover 6 is provided.
The vortex chamber 12 having a large cross-sectional area for facilitating passage of sewage and fibrous solids mixed in filth is formed in combination with the shape of the above. Semicircular W-shaped notches 13 are provided at several points on the inner edge of the suction hole 11, and corners along the entire inner edges of the suction hole 11 and the notch 13 are formed on the inner blade 14, and the conical surface around the notch 13 is formed. In FIG. 10, a streamlined recess 15 having a tongue-like shape extending from the inside to the outside in three directions and a thin groove 15a bored along the inner peripheral portion of the recess are used to form a spiral blade having an acute angle around the periphery. 16
To form. The suction cover 6 has a mounting bolt hole 17 for the suction port 7 mounted on the front surface thereof.

In FIGS. 4, 5 and 6, the impeller 8 is a disc 25 integrated with a boss 18 attached to the drive shaft 4.
A plurality of pumping impellers 20 that are curved in a spiral shape and have side edge blades 19 that are in contact with the conical surface 10 from the periphery of the boss 18, and from the center of the leading edge of each pumping impeller 20 to the boss 18. A spiral blade 21 rotatably fitted into the suction hole 11 through a step 21a, and the suction hole hole 1
1. A cutting impeller 23 integrally formed by providing a cutting blade 22 on the outer peripheral portion that rotates in close contact with 1 is mixed with dirty water and dirt by the inner blade 14 and the cutting blade 22 around the suction hole 11 and is sucked. The fibrous solid material is cut and cut.
Around the tip of the boss 18, a concavo-convex portion is formed in the axial direction to provide a stirring blade 24 so that the foreign matter can be hooked and stirred to be easily pulled in. On the back surface of the disk 25, thin blades 26 are formed around the boss 18 in three directions from the center.

In this submersible pump, a cooling box for water and liquid (bentonite, etc.) for cooling the motor 2 by connecting to a water pipe provided inside the pipe is installed diagonally above the outer box 1 with a built-in motor. It is possible to employ a motor cooling system that cools by water supply, liquid supply. By doing so, it is possible to downsize the submersible pump provided with the motor cooling mechanism that works while appropriately moving in the sewer pipe.

[0013]

Since the present invention is constructed as described above, it has the following effects.

In the submersible pump of the present invention, the fibrous solid matter mixed in the pump is sucked in while being wound from the tip of the impeller, and the impeller having a sharp and excellent durability and the suction hole surrounding the suction cover are formed. The solid matter can be finely cut with a cutter blade including a blade and a spiral blade to reliably and easily prevent blockage in the pump and the pipe.

Furthermore, the vortex chamber has a large passage cross-sectional area so that solids can easily pass through, and filthy water and fibrous foreign matter mixed in the filth can be easily and easily cut off, so that the operation of the pump and the motor can be performed. Since the load can be significantly reduced and the water can be discharged smoothly, it is possible to provide a tough submersible pump with high efficiency and durability with less clogging and failure in the pump and piping, and sewage treatment plant, night soil treatment plant sewage, It can be widely used for transferring filth, discharging and transferring livestock urine, and other similar applications.It is most suitable as a large water type submersible pump for transferring sewage and filth containing fibrous foreign matter, and is an expensive pump. Compared to the main body, the impeller and the suction cover can be easily removed and replaced, so that maintenance is easy.

The submersible pump is not limited to the above-mentioned use, but it can be used as a submersible or on-ground pump which can be used even at a submerged site due to an abnormal increase of water in a river during a typhoon or flooding.

[Brief description of drawings]

FIG. 1 is a front view showing an entire submersible pump for a sewer pipe with a cutter according to the present invention, with a part cut away.

FIG. 2 is a side view seen from the inside of the suction cover used in the present invention.

FIG. 3 is the same cross-sectional view of FIG.

FIG. 4 is a perspective view of an impeller used in the present invention.

FIG. 5 is a side view of the impeller.

FIG. 6 is a front view of the inhaler. 2 Motor 4 Drive Shaft 5 Casing 6 Suction Cover 7 Suction Port 8 Impeller 9 Discharge Port 10 Conical Surface 11 Suction Hole 12 Vortex Chamber 13 Notch 14 Inner Blade 15 Saw-Shaped Recess 15 Narrow Groove 16 Vortex Blade 18 Boss 19 Side edge blade 20 Pumping impeller 21 Spiral blade 22 Cutting edge 23 Cutting impeller. 24 Stirring blade 25 Disc

Claims (1)

[Claims] 1. In a horizontal shaft single-suction submersible pump with a built-in motor, the inner surface of the front surface of the casing facing the impeller is a conical surface facing the suction port side, and the inner surface of the suction hole is located at several points on the inner circumference. A notch is provided to form an inner blade on the entire inner edge, and a tongue-shaped recess extending from the inside to the outside and a groove along the inner circumference of the recess are formed on three sides of the conical surface around the notch. To form a spiral blade, and the impeller has a disk at the rear of the boss attached to the drive shaft, and a plurality of pumping impellers curved in a spiral shape having a side edge blade in contact with the conical surface on the front surface of the disk. A submersible pump for a sewer having a cutter integrally provided with a cutting impeller having a spiral blade and a cutting blade that is inserted into the suction hole and is rotated at the front edge of each pumping impeller to be cut by the inner blade.