JP2780229B2 - underwater pump - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper casing made of an elastic material, a lower casing made of an elastic material and covered with a lower casing cover, and an upper casing. And a strainer that covers the lower casing. 2. Description of the Related Art FIG. 3 shows a conventional submersible pump of this type, in which a motor casing MC containing a motor M is provided with a flow path F, and a pump casing PC is provided below the motor casing MC. It is installed. [0003] When the handling liquid contains soil and the like, such as a civil engineering pump, the pump casing PC is worn. The pump casing PC is made of an elastic material such as rubber and is resistant to wear. In addition, it can be replaced when worn out. In the pump casing PC, an upper casing 4 made of an elastic material and defining a volute chamber 2 accommodating the impeller 1 and a lower casing 5 covered with a lower casing cover 6 made of an elastic material and metal are combined with each other. The upper casing 4 and the lower casing 5 made of an elastic material are sealed together by being fastened and fixed to the intermediate casing 3 with a plurality of double screw bolts 8 and nuts 9. Also, a strainer 7 having a large number of holes H formed on the side surface and provided so as to cover both casings 4 and 5 has:
It is fastened and fixed to the intermediate casing 3 by the two screw bolts 8 and another nut 10. In the above-described submersible pump, when the strainer 7, the lower casing 5, and the upper casing 4 are removed for inspection and repair of the pump, bolts of the casings 4, 5 are removed. There is a drawback that the hole is hard to be caught on the screw thread of the double screw bolt 8, and mud and sand enter the screw groove of the double screw bolt 8 inside and outside the strainer 7,
Therefore, there is a drawback that it is difficult to remove the nuts 9 and 10, and the inspection and repair of the pump section of the submersible pump are troublesome. The present invention has been proposed in view of the above-described problems of the conventional submersible pump, and allows the upper casing and the lower casing made of an elastic material to be easily removed when inspecting or repairing the pump. It is an object of the present invention to provide a submersible pump that can easily disassemble the pump section. According to the present invention, an upper casing made of an elastic material, a lower casing covered with a lower casing cover made of an elastic material, an upper casing and a lower casing are provided in the intermediate casing. In the submersible pump having a strainer covering the lower casing cover, the lower casing cover is integrally formed with a plurality of projecting portions projecting downward, the projecting portions engaging with the strainer, and the lower portion except at the projecting portion. The bottom surface of the casing cover is separated from the strainer, and bolts penetrate through the strainer, the projection of the lower casing cover, the lower casing, and the upper casing and screw into the intermediate casing, and the strainer, the lower casing cover, the lower casing, and the upper casing. Are jointly fixed to the intermediate casing by a plurality of bolts. According to the submersible pump of the present invention having the above-described structure, when the bolt is removed from the intermediate casing, the strainer, the lower casing cover, the lower casing, and the upper casing fixed together with the intermediate casing are fixed. The pump can be easily disassembled. [0008] At this time, the bolt only needs to be threaded only at the tip portion which is screwed into the intermediate casing. Therefore, the bolt insertion hole of the lower casing and the upper casing and the screw thread of the bolt are caught off. It won't be difficult. In addition, the bolts are covered by the protrusions of the lower casing cover, and the threaded portions are located in the intermediate casing and the upper casing, so that mud or sand does not enter the thread grooves, and therefore, the bolts are unlikely to come off. There is no. Further, the bolt is screwed to the intermediate casing via a projection of the lower casing cover,
Therefore, even if the strainer is made of a thin metal plate,
The bolts can be strongly tightened, so that the joint surface between the upper casing and the lower casing made of an elastic body is reliably sealed. An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In FIGS. 1 and 2, portions corresponding to FIG. 3 described above are denoted by the same reference numerals, and redundant description will be omitted. In FIGS. 1 and 2, the lower casing cover 6a is integrally formed with a plurality of projections 14 projecting downward, and the strainer 7 is formed with a plurality of concave seats 11. The protruding portion 14 of the lower casing cover 6a is in contact with the inside. Therefore, the bottom surface 16 of the lower casing cover is located on the bottom surface 18 of the strainer except for the projections 14.
It is provided away from. A bolt 13 passes through the strainer 7, the projecting portion 14 of the lower casing cover 6a, the lower casing 5, and the upper casing 4, and is screwed into the intermediate casing 3, and the strainer 7, the lower casing cover 6a, and the lower casing 5 and the upper casing 4 are composed of a plurality of bolts 13
To the intermediate casing 3. By tightening the bolts 13, the pump section is assembled, and at this time, the concave seat 11 of the strainer 7 is assembled.
Presses the protruding portion 14 of the lower casing cover 6a, and the joint surfaces of the upper casing 4 and the lower casing 5 both made of an elastic body are pressed against each other to seal between the casings 4 and 5. With such a construction, the bolt 13
Simply remove the intermediate casing 3 from the intermediate casing 3.
The strainer 7, the lower casing cover 6a, the lower casing 5 and the upper casing 4, which are fixed together, can be easily disassembled and the pump can be inspected and repaired easily and quickly. At this time, the bolt 13 only needs to be threaded at only the tip end portion screwed to the intermediate casing 3. Therefore, the bolt insertion hole of the lower casing 5 and the upper casing 4 and the thread of the bolt 13 It is not difficult to get caught off. Further, the bolt 13 is covered with a protrusion 14 of the lower casing cover 6a, and its screw portion is located in the intermediate casing 3 and the upper casing 4, so that mud or sand does not enter into the screw groove. Is not difficult to remove. The present invention has the following excellent effects. (B) Just by removing the bolts from the intermediate casing, the strainer, lower casing cover, lower casing, and upper casing fixed together with the intermediate casing are released, and the pump section can be easily disassembled. Inspection and repair can be performed easily and quickly. (B) The bolt only needs to be threaded at the tip end portion screwed into the intermediate casing. Therefore, the bolt insertion hole of the lower casing and the upper casing and the screw thread of the bolt are caught off. It does not cause the inconvenience of becoming difficult. (C) The bolt is covered with a projecting portion of the lower casing cover, and its screw portion is located in the intermediate casing and the upper casing, so that mud and sand do not enter into the thread groove, so that the bolt comes off. It does not cause the inconvenience of becoming difficult. (D) The bolt is screwed to the intermediate casing via the projection of the lower casing cover. Therefore, even if the strainer is made of a thin metal plate, the bolt can be strongly tightened. As a result, the sealing at the joint surface between the upper casing and the lower casing made of the elastic body is reliably performed. (E) The projection serving as a distance body between the strainer and the lower casing cover is formed integrally with the lower casing cover. Therefore, another member is prepared as the distance body, and the strainer and the lower casing cover are provided. There is no need for the trouble of installation between them, and the protrusion can be easily formed by drawing a metal plate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a pump section of a submersible pump according to an embodiment of the present invention. FIG. 2 is an enlarged sectional view of a main part. FIG. 3 is a sectional view of a conventional submersible pump. [Description of Signs] 3 ... Intermediate casing 4 ... Upper casing 5 ... Lower casing 6a ... Lower casing cover 7 ... Strainer 13 ... Bolt 14 ... Projection of lower casing cover

   ────────────────────────────────────────────────── ─── Continuation of front page       (56) References Japanese Utility Model Showa 59-49792 (JP, U)                 Actual opening 1979-103606 (JP, U)                 Shokai Sho 56-161962 (JP, U)                 Jiko 57-41424 (JP, Y2)

Claims (1)

(57) [Claims] In the intermediate casing, an upper casing made of elastic material,
In a submersible pump provided with a lower casing made of an elastic material and covered with a lower casing cover, and a strainer covering the upper casing and the lower casing, the lower casing cover is integrally formed with a plurality of projecting portions projecting downward. The protrusion engages with the strainer, and the bottom surface of the lower casing cover is separated from the strainer except at the protrusion, and the bolt penetrates through the strainer, the protrusion of the lower casing cover, the lower casing, and the upper casing. Wherein the strainer, the lower casing cover, the lower casing, and the upper casing are fixedly fastened to the intermediate casing by a plurality of bolts.