JP2001040695A - Casing structure for underwater pump for sand collecting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce abrasion on a sediment suction casing and facilitate replacement for worn portions. SOLUTION: A casing structure for an underwater pump used for dredging the bottom of water such as the sea comprises a ring-shaped casing 13 with a U-shaped cross section covering the outer periphery of an impeller 12 sucking up and discharging sediment or the like, a cylindrical front liner 15 concentric with the impeller 12 screwed to a sucking-up opening 13a of the casing 13 and a front cover 16. The liner 15 comprises an anti-abrasive material, and the outer edge of the flange 15a comes to an abrasive portion near R-portion 13 on the inner surface of the outer peripheral wall of the casing 13. If it is worn, it must be replaced with a new one. A casing portion worn relatively little can be repaired with high manganese steel by welding at a low cost and its life can be extended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing structure of a hydraulic or electric submersible pump used for dredging of earth and sand for sucking up earth and sand at the bottom of the sea such as a sea, a river, a lake and a dam.

[0002]

2. Description of the Related Art As a facility for dredging this kind of earth and sand, for example, in the sea, as shown in FIGS. , Leading the end of the pipe P to the seabed G corresponding to the water depth,
It is common to suck up earth and sand onto a ship by suction. The suction operation is performed by a pump in the ship S or by a submersible pump A as shown in the figure.

The submersible pump A in this equipment is provided with a wrapper tube 2 at the tip of a suction port tube 1 and sprays water from a nozzle 3 around the tube to suck the loosened earth and sand while loosening the sand on the seabed G. (See Japanese Patent Application Laid-Open No. 10-82271). For sucking and sending out the earth and sand, the earth and sand is sucked in from the opening of the casing by the rotation of the impeller and sent out to the suction pipe P from the discharge port on the outer periphery of the casing (see the embodiment).

[0004]

In the submersible pump A, since the specific gravity of the earth and sand is large, it is sent so as to rub the inner surface of the casing between the opening of the casing and the discharge port. In the vicinity of the radius part, the wear is severe.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to reduce the wear of the casing and facilitate replacement of the worn portion.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a wear-resistant liner capable of replacing a portion of the casing near the opening which is easily worn away.

If it can be replaced, it can be replaced with a new one if it becomes worn. The casing part with relatively little wear can be repaired by welding, for example, a high manganese steel can be used, and it becomes inexpensive. At the same time, the life of the casing can be extended.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention include:
Pumping up sediment from the seabed, rivers, lakes, dams, etc.
A casing structure of a submersible pump used for dredging of earth and sand, wherein an annular casing body having a U-shaped cross section covering the outer periphery of an impeller for sucking and discharging the earth and sand, and a suction opening of the casing body. The front liner and the front cover are each formed of a cylindrical body concentric with the impeller having a flange at one end, and the front cover is covered on the outer surface of the front liner. Is screwed to the opening of the casing body via the flange, and the front liner is made of a wear-resistant material, and the outer edge of the flange is near the radius of the inner surface of the outer peripheral wall of the casing. It may be configured to reach a part that is easily worn.

[0009]

FIG. 3 shows an embodiment of the submersible pump A of FIG. 2 in the dredging equipment of FIG.
The motor 11 in the motor casing 10 is provided with an impeller 12, and the impeller 12 is covered with a casing 13, and the casing 13 is bolted to the motor casing 10.

The casing 13 is an annular body having a U-shaped cross section. One side opening 13a of the casing 13 is connected to the suction port tube 1, and the rotation of the impeller 12 allows the earth and sand to be sucked in from the opening 13a as shown by an arrow. . A discharge port 14 is provided around the outer periphery of the casing 13, and a suction pipe P is connected to the discharge port 14, and the sediment sucked into the casing 13 is sent out from the discharge port 14 to the suction pipe P.

In the opening 13a of the casing 13, a cylindrical front liner 15 and a front cover 16 concentric with the impeller 12 are provided with respective flanges 15a, 16a.
a, and is screw-connected to the suction port cylinder 1 via the cover 16. The outer edge of the flange 15a of the front liner 15 reaches an easily wearable portion near the round portion 13b on the inner surface of the outer peripheral wall of the casing 13. The position of the outer edge of the flange is appropriately set in consideration of the degree of wear in actual operation and experiments. The front cover 16 is put on the front liner 15, and the cover 16 is screwed to the casing 13 so that the liner 15 is sandwiched between the cover 16 and the casing 13 to be supported.

The casing 13 is made of a material which can be repaired by welding, such as high manganese steel, and the front liner 15 is made of a wear resistant material such as high chromium cast iron. In the figure, reference numeral 18 denotes a back liner.

[0013] In the casing structure having this structure, the portion of the casing 13 where the casing 13 is easily worn is a liner 1 made of a wear-resistant material.
The liner 15 is screwed and easily replaced, so that the entire casing has a long life. In addition, since the casing 13 can be repaired by welding, even if the casing 13 is suddenly damaged due to some circumstances, the repair can be performed, and inconveniences such as stoppage of the work hardly occur.

[0014]

According to the present invention, since the wear portion is formed by the wear-resistant liner as described above, the degree of wear is reduced, and if the wear occurs, the liner may be replaced.
The life of the entire casing can be extended.

[Brief description of the drawings]

Fig. 1 Illustration of sediment collection

FIG. 2 is a front view of a submersible pump.

FIG. 3 is a cutaway view of a main part of one embodiment.

[Explanation of symbols]

 A Submersible pump 10 Motor casing 11 Motor 12 Impeller 13 Casing 14 Discharge port 15 Front liner 15a Front liner flange 16 Front cover 16a Front cover flange

Claims (1)

[Claims] 1. A casing structure of a submersible pump A used for sediment dredging for sucking up sediment and the like at the bottom of a sea, a river, a lake, a marsh, a dam, and the like. An annular casing 13 having a U-shaped cross section covering the periphery thereof, and a front liner 15 and a front cover 16 screwed to a suction opening 13a of the casing 13, each of the front liner 15 and the front cover 16 having one end The front liner 15 is formed of a cylindrical body concentric with the impeller 12 having flanges 15a and 16a.
5 and 16 are screwed to the opening 13a of the casing 13 via the flanges 15a and 16a, and the front liner 15 is made of a wear-resistant material. Casing 1
3. A casing structure of a submersible pump, wherein the casing structure extends to a portion that is easily worn near the round portion 13b on the inner surface of the outer peripheral wall of No. 3.