JPH0248719Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention consists of a pump shaft having an impeller, a protection pipe surrounding the pump shaft, and a hanging pipe surrounding the protection pipe. This invention relates to vertical shaft pumps or oblique shaft pumps.

BACKGROUND OF THE INVENTION A conventional pump, for example a vertical shaft pump, is shown in FIG. This vertical shaft pump P has a pump shaft 1
, a protection tube 20 , and a hanging tube 30 . This pump shaft 1 is composed of a plurality of short shafts,
Their short axes are joined by a joint 2 to form a long axis, and an impeller 3 is attached to the tip of the long axis with a key 4 and a nut 5.
The upper end of the pump shaft 1 is connected to the output shaft 7 of the motor 6 by a coupling 8. Further, the pump shaft 1 is supported by a plurality of underwater bearings 9a, 9b, and 10 as described later.

The underwater bearing 9 has a bracket 11, the radially outer end of which is fixed to the inner peripheral surface of the suspension tube 30, and the bearing portion at the radially inner end thereof has an annular projection extending in the axial direction. 12 are provided, and protective tubes 20 are inserted into these protrusions 12 at predetermined intervals so as to surround the pump shaft 1. The lower part of the protective tube 20 is connected to the holding frame 1 of the underwater bearing 10.
The upper part extends to the insertion part 14 of the discharge elbow 3.
It is inserted into the protruding part of the packing box 15 arranged at the curved part 1. The lubricating fluid is injected from the opening 16 of the upper packing box 15, flows downward through the space between the pump shaft 1 and the protective tube 20, lubricates the underwater bearings 9a, 9b, and 10, and then flows from the back side of the impeller 3. be discharged.

The hanging pipe 30 has flanges 32 at every fixed length, and just as the pump shaft 1 and the protection pipe 20 are joined together, the hanging pipe 30 is also connected by the flanges 32 to form a desired length. It's becoming like that. A discharge passage 33 is formed between the hanging pipe 30 and the protection pipe 20. Therefore, hanging pipe 3
0 is connected to a flap-shaped suction port 35 via a ball 34 that accommodates the impeller 3, and its upper end is connected to a discharge elbow 31.

Therefore, when the motor 6 is started and the pump shaft 1 is rotationally driven, the vertical shaft pump P sucks the liquid to be processed through the suction port 35 and discharges it from the end of the discharge elbow 31.

By the way, when manufacturing the vertical shaft pump as described above, it is usually assembled in a horizontal position as shown in FIG. That is, the bases 50, 50
At this time, the suspension pipe 30 is placed on the base, and the pump shaft 1 is attached to a suspended wire 52 of a crane, for example. , and when assembling and fixing the underwater bearing 9 to the end of the suspension tube 30, the end of the protection tube 20 is inserted into the protrusion 12, but the protection tube 20 is bent downward as shown in the figure. This assembly work is difficult, and in the case of relatively large-diameter pumps, the protective tube itself is large and heavy, so inserting and assembling the protective tube requires additional lifting means such as jacks, making the assembly process complicated. It has become a thing. Also, protection tube 20
is simply inserted into the protrusion of the underwater bearing,
Since no separate fixing means is provided, there is a risk that the pump shaft or hanging pipe may be damaged due to movement due to vibrations or water flow during pump operation. The above-mentioned situation is applicable only to vertical shaft pumps, and the same applies to oblique shaft pumps.

For example, in the vertical shaft pump disclosed in Japanese Utility Model Application Publication No. 56-20097, the bearing of the pump shaft is attached to the hanging pipe via a rib, similar to the conventional example shown in FIG. Therefore, even with such known technology, assembly work is complicated and reliability during operation is low.

[Problems to be Solved] Therefore, it is an object of the present invention to provide a vertical shaft or oblique shaft pump that eliminates the above-mentioned drawbacks, is easy to assemble, and has high reliability during operation.

[Means for Solving the Problems] According to the present invention, a vertical shaft or oblique shaft pump is arranged with a pump shaft having an impeller at its tip and a predetermined interval surrounding the shaft. and a hanging tube arranged to surround the protective tube and forming a discharge path between the protective tube and the hanging tube, and the protective tube and the hanging tube are fixed together by ribs. It has been done.

[Function] Therefore, since the protective tube is integrally fixed to the hanging tube by the ribs, the protective tube will not bend like in the past even if it is assembled horizontally. Therefore, assembly work can be performed efficiently. Furthermore, even if vibrations, drastic changes in water flow, etc. occur during pump operation, the integrated rib prevents the protective tube from separating from the protrusion of the bearing, unlike in the conventional case.
Therefore, operational reliability is high. Also, since the protection tube is integrally fixed to the suspension tube, it is possible to configure the end of the protection tube to simply abut against the protrusion of the bearing, without having to insert it into the protrusion as in the conventional case. be. In this case, it is convenient if the bearing part or the end of the protective tube is made of an elastic material such as rubber.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. 3, taking a vertical shaft pump as an example. Components that are the same as those in the conventional example shown in FIG. 1 are given the same reference numerals and repeated explanations will be omitted. In FIG. 3, the protective tube 20
and the hanging pipe 30 are fixed together with ribs 40. Since the hanging tube 30 is long, a plurality of hanging tube sections are connected by flanges, and one or a pair of ribs 40 are used for one hanging tube section. The protection tube 20 is integrally fixed to the hanging tube 30 by means such as welding. Therefore, the upper end of the protective tube 20 is inserted into the annular projection 12 of the underwater bearing 9, and at the lower end, the protective tube 20 and the suspension tube are connected by a rib 40.

[Effects of the invention] As detailed above, according to the invention, the protective tube and the suspension tube are integrally fixed through the ribs, which makes the pump easy to assemble and highly reliable in operation. is obtained. Furthermore, since the protective tube can be assembled without special need for a jack or the like to support the protective tube as in the conventional case, there is also an advantage that the number of assembled parts can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a conventional vertical shaft pump, Fig. 2 is a partially sectional front view showing a method of assembling a conventional vertical shaft pump, and Fig. 3 is a sectional view of a vertical shaft pump implementing the present invention. . DESCRIPTION OF SYMBOLS 1... Pump shaft, 20... Protection tube, 30... Suspension pipe, 33... Discharge path, 40... Rib.

Claims (1)

[Scope of utility model registration request] a pump shaft having an impeller at its tip; a protection tube surrounding the shaft and placed at a predetermined distance from the shaft; and a protection tube surrounding the protection tube. A vertical shaft or oblique shaft pump comprising a hanging pipe forming a discharge path between the pipe and the hanging pipe, wherein the protection pipe and the hanging pipe are integrally fixed by ribs. .