JPH0452477Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for fixing the casing of a submersible pump used for pumping water from deep wells.

[Conventional technology]

Submersible pumps are used by being submerged in water, such as deep wells, and are equipped with a plurality of impellers to obtain a high pumping head. Therefore, a pump casing generally has a plurality of intermediate casings stacked on top of each other depending on the number of impellers between an upper casing and a lower casing, and these upper casings and lower casings are fixed together by tightening them together. .

Conventionally, as shown in FIG. 3, fixing bolts 2, 2 are integrally joined to both ends of a tightening band 1 in parallel to the axial direction of the band 1, and these There is one in which the bolts 2, 2 are inserted into bolt insertion holes 5, 5 provided in the upper and lower casings 3, 4, and tightened with nuts 6, 6.

[Problem that the invention attempts to solve]

However, according to this structure, since the fixing bolts 2, 2 are provided parallel to the axial direction of the tightening band 1, a force in the circumferential direction is applied to the tightening band 1 when tightening the nuts 6, 6. Therefore, there is a problem that the tightening band 1 is twisted. If the tightening band 1 is twisted in this way, the bolts 2, 2 cannot be tightened reliably, resulting in insufficient tightening of the casing, and the tightening band 1 protrudes from the casing, increasing the maximum outer diameter of the pump. occurs.

The present invention was developed under the above circumstances, and an object of the present invention is to provide a submersible pump casing fixing device that can prevent the tightening band from twisting.

[Means for solving problems]

In this invention, a fixing bolt is integrally joined to the end of the tightening band, the bolt is bent, the bent part is inserted into a bolt insertion part provided in the upper or lower casing, and the bolt is tightened with a nut. It is characterized by being fastened to the casing.

[Effect]

According to the configuration of the present invention, the fixing bolt is bent and the bent part is inserted into the bolt insertion part, so when the bolt is tightened with the nut,
The bent portion and the inner wall of the bolt insertion portion interfere with each other to prevent rotation of the bolt, and the tightening band will not be twisted.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, 10 indicates a casing of a submersible pump. This casing 10 is an upper casing 1
1, a lower casing 12, and a plurality of intermediate casings 13. Within the intermediate casing 13, multiple stages of impellers 14 are attached to a vertical shaft (not shown). And this casing 1
0 is integrally fixed with a tightening band 15 between an upper casing 11 and a lower casing 12 with an intermediate casing 13 interposed therebetween.

The tightening bands 15 are formed into a band shape from a metal material such as stainless steel, and are provided at, for example, four locations at equal intervals in the circumferential direction of the casing 10. One fixing bolt 16 is integrally provided at the lower end of this tightening band 15 by fixing means such as welding. This one bolt 16
is bent halfway toward the center of the casing 10 with respect to the axial direction of the tightening band 15. One of the bolts 16 is fitted into a bolt insertion portion 17 provided in the lower casing 12, and is tightened to the lower casing 12 with a nut 18.

One bolt 16 is inserted into the bolt insertion portion 17.
An inclined wall 17a is formed which is inclined in accordance with the inclination of the bent portion 16a. Therefore,
The bent portion 16a of one of the bolts 16 and the inner wall of the bolt insertion portion 17 are adapted to engage with each other.

On the other hand, the other fixing bolt 1 is attached to the upper end of the tightening band 15 in parallel to the axial direction of the band 15.
9 is integrally provided. The other bolt 19 is inserted into a bolt insertion hole 20 provided in the upper casing 11 and tightened with a nut 18.

In the submersible pump casing 10 configured as described above, the other bolt 19 is first inserted into the bolt insertion hole 2.
0 and nut 1 to this other bolt 19.
8 fixes the upper end of the tightening band 15 to the upper casing 11. Next, one bolt 16 is inserted into the bolt insertion portion 17, and this one bolt 16 is tightened with a nut 18.
Thereby, the intermediate casing 13 can be sandwiched between the upper casing 11 and the lower casing 12, and the casing 10 can be integrally fixed.

When one bolt 16 is tightened with the nut 18, the bent portion 16 of this one bolt 16
Since a and the inner wall of the bolt insertion portion 17 are engaged with each other, rotation of one of the bolts 16 due to the screwing of the nut 18 is prevented, so that the tightening band 15 is not twisted. This makes it possible to reliably tighten one of the bolts 16, thereby preventing insufficient tightening of the casing 10.
At the same time, since the tightening band 15 can be prevented from protruding from the casing 10 by twisting, the maximum outer diameter of the pump does not increase.

Note that the present invention is not limited to the above-mentioned embodiment. That is, in the above embodiment, only the bolt provided at the lower end of the tightening band was bent.
The bolt at the top end may be bent, or both bolts may be bent.

Further, in the above embodiment, both ends of the tightening band are fixed with bolts and nuts, but one end of the tightening band may be bent into a U-shape to engage the casing, and only the other end is fixed with bolts and nuts. You can do it like this.

[Effects of the Invention] According to the invention described in detail above, it is possible to prevent the tightening band from twisting, thereby preventing insufficient tightening of the casing and an increase in the maximum outer diameter of the pump.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, with FIG. 1 being a sectional view of the main part, and FIG. 2 being a bottom view of the main part taken along the line - in FIG. FIG. 3 is a sectional view showing a conventional example corresponding to FIG. 1. 10...Casing, 11...Upper casing, 12...Lower casing, 13...Intermediate casing, 15...Tightening band, 16...Fixing bolt, 16a...Bending portion, 17...Bolt insertion portion, 18 ...Natsuto.

Claims (1)

[Scope of utility model registration request] A casing fixing device for a submersible pump in which a plurality of intermediate casings are stacked between an upper casing and a lower casing, and the upper casing and lower casing are tightened with a plurality of tightening bands to integrally fix these casings,
A fixing bolt is integrally joined to the end of the tightening band, the bolt is bent, the bent part is inserted into the bolt insertion part provided in the upper or lower casing, and the bolt is attached to the casing with a nut. A submersible pump casing fixing device characterized by tightening.