JPH1137082A - Upper structure of vertical pump and assembling method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a ceramics bearing from breaking down at assembly by making detachable a bearing fixing metal fitting capable of once temporarily fixing the ceramics bearing on the upper face of a lower side pipe. SOLUTION: An upper shaft protecting pipe is divided into two an upper part and a lower part, and divided into the lower side pipe 3 of the upper shaft protecting pipe and the upper side pipe 4 of the upper shaft protecting pipe concentrically piled on the outer circumference of the lower side pipe. Further, a shoulder part 3A is steppedly provided on the lower side pipe 3, and an engaging part 4A engaging with the shoulder part 3A is provided on the upper side pipe 4, so that a detachable bearing fixing metal fitting 9 can be fitted to the upper end face of the lower side pipe 3. A half-divided stop ring 5 is mounted in the groove of the lower side pipe 3, a fixing ring 6 movable up and down is provided on the upper side pipe 4, and the stop ring 5 mounted on the groove of the lower side pipe 3 is fixed by the fixing ring. Hereby, a ceramics bearing 1 at assembling can be prevented from breaking down.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper structure of a vertical pump and an assembling method thereof.

[0002]

2. Description of the Related Art FIG. 8 is a longitudinal sectional view of a conventional vertical pump. This is a common river water pump. In the figure,
12 is an upper discharge pipe, 13 is a lower discharge pipe, 14 is a guide blade assembly, 15 is a suction port, 16 is an impeller, 17 is an intermediate bearing provided between the upper discharge pipe 12 and the lower discharge pipe 13, 8 is a discharge curved pipe attached on the upper discharge pipe, 8A is a main shaft insertion portion provided on the discharge curved pipe, 7
Is a main shaft that penetrates through the main shaft insertion portion 8A of the discharge curved tube 8, the intermediate bearing 17, and the guide blade assembly 14 and is connected to the impeller 16, an upper shaft protection tube 18 for protecting the main shaft, 19
Is a lower shaft protection tube.

FIG. 9 is an enlarged view of a portion IX of FIG. The main shaft 7, the curved discharge tube 8, the main shaft insertion portion 8A, and the upper shaft protection tube 18 are the same as those described in FIG. Reference numeral 2 denotes a bearing sleeve attached to the main shaft 7, and 1 denotes a main shaft insertion portion 8A between the sleeve and the lower portion of the main shaft insertion portion 8A of the discharge curved tube 8.
Ceramic bearings incorporated in

[0004] The vertical pump of a general river water pump is provided with a shaft protection pipe. This protects the shaft between the discharge curved pipe 8 and the intermediate bearing 17 with one pipe (upper shaft protection pipe 18), and connects the shaft between the intermediate bearing 17 and the guide blade assembly 14 with the other one. (The lower shaft protection tube 19).

The procedure for assembling the upper structure including the discharge curved pipe 8, the ceramic bearing 1, and the upper shaft protection pipe 18 is as follows. First, in a state where the lower structure including the upper discharge pipe 12, the portion below the intermediate bearing 17, and the main shaft 7 is assembled, the upper shaft protection tube 18 is put on the main shaft 7 and the intermediate bearing 1 is mounted.
7, while the ceramic bearing 1 is pre-installed in the discharge curved tube 8, the discharge curved tube 8 is put on the main shaft 7, the main shaft 7 is inserted into the main shaft insertion portion 8 </ b> A, and the discharge curved tube 8 is inserted.
Is lowered, and the upper end of the upper shaft protection tube 18 is
A is fitted to the outer periphery of the lower end of A, and the lower flange of the discharge curved pipe 8 is fixed to the upper flange of the upper discharge pipe 12 with bolts.

[0006]

It is well known that ceramic bearings are vulnerable to impact. In the conventional structure, the ceramic bearing is assembled with the main shaft and the shaft protection tube in a state where the ceramic bearing is incorporated in the curved discharge tube. That is, the discharge curved pipe, which is a heavy object, is placed on the main shaft while operating using a crane or a lifting device, and the main shaft penetrates through the main shaft insertion portion 8A of the discharge curved pipe 8.

In the conventional upper structure and the method of assembling the same, since the gap between the ceramic bearing 1 and the main shaft 7 is small,
The ceramic bearing 1 was sometimes damaged by contact.
In addition, there is a drawback that the pump is operated without noticing that the pump is damaged, and an abnormality may be found only at that time.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide an upper structure of a vertical pump and a method of assembling the same without damaging a ceramic bearing.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises a discharge bent pipe having a main shaft insertion portion, a lower flange of which is bolted to an upper flange of an upper discharge pipe, A ceramic bearing mounted between the main shaft insertion portion of the discharge curved pipe and the lower end of the main shaft insertion portion, and an intermediate bearing covering the main shaft and the ceramic bearing mounting portion and having a lower end penetrated by the main shaft; The present invention relates to an upper structure of a vertical pump having the following features and an assembling method thereof.

(1) The shaft protection tube is divided into a lower tube having an upper end at a position below and below the bearing mounting portion and an upper tube concentrically overlapping the outer periphery of the lower tube. An engaging portion for engaging the upper pipe with the lower pipe when the lower pipe is pulled down is provided between the upper pipe and the lower pipe, and a mechanism for supporting the upper pipe when the upper pipe is pulled up is provided on the lower side. An upper structure of a vertical pump, characterized in that a bearing fixture for temporarily placing and fixing a ceramic bearing on the upper surface of the lower tube is detachable.

(2) In the method for assembling the upper structure of the vertical pump according to the above mode (1), the lower structure including the upper discharge pipe and the intermediate bearing, and the main shaft passing through the intermediate bearing are already assembled. A method for assembling the upper structure of a vertical pump, comprising assembling in the following order from a state. The lower tube of the shaft protection tube is fitted to the main shaft, and the lower end thereof is fixed to the holding portion of the intermediate bearing. The upper tube of the shaft protection tube is fitted to the main shaft, and it is engaged with the lower tube and temporarily placed. Attach a bearing fixture to the upper surface of the lower tube. A ceramic bearing is fitted to the main shaft, fixed to the bearing fixture, and temporarily placed. The discharge bending pipe is lowered downward through the main shaft passing portion of the discharge bending pipe, and its lower flange is fastened to the upper flange of the upper discharge pipe. The ceramic bearing is detached from the bearing fixture and lifted and assembled into the inner surface of the lower end of the main shaft insertion part of the discharge curved pipe. Remove the bearing bracket. The temporarily placed upper tube is lifted and its upper end is fitted to the outer periphery of the lower end of the main shaft insertion portion of the discharge curved tube, and the lower end is supported by the lower tube via the above-mentioned support mechanism.

[0012]

FIG. 1 is a vertical sectional view showing the structure of a peripheral part of a ceramic bearing of a vertical pump according to an embodiment of the present invention. This diagram is a diagram corresponding to FIG. 9 (prior art diagram). In the figure, a main shaft 7, a discharge curved tube 8, a main shaft insertion portion 8A of the discharge curved tube, a ceramic bearing 1, and a bearing sleeve 2 are the same as those in the related art. This mode is different from the conventional mode as follows. First, the conventional upper shaft protection tube 18
Is divided into upper and lower parts, and is divided into a lower tube 3 of the upper shaft protection tube and an upper tube 4 of the upper shaft protection tube concentrically overlapping the outer periphery of the lower tube. In the following description, “the upper shaft protection tube” will be omitted, and will be described simply as “the lower tube 3” and “the upper tube 4”. What is different from the conventional embodiment is that a stepped shoulder 3A is provided on the lower tube 3 and the shoulder 3A is provided on the upper tube 4.
And a detachable bearing fixing bracket 9 can be attached to the upper end surface of the lower pipe 3. A half-shaped stop ring 5 is provided in a groove of the lower pipe 3. The upper ring 4 is provided with a fixing ring 6 which can be moved up and down, and the fixing ring fixes the stop ring 5 mounted in the groove of the lower tube 3. The retaining ring 5 supports the upper tube 4 when it is lifted. Parts other than the above are conventional technologies (FIGS. 8 and 9)
Is the same as

FIGS. 2 to 7 are explanatory views of the assembling process of the upper structure of the vertical pump, and show steps 1 to 6. Hereinafter, an assembling procedure will be described along an assembling process. It is assumed that the upper discharge pipe 12, the portion below the intermediate bearing 17, and the main shaft 7 shown in FIG. 8 have been assembled.

FIG. 2 (Step 1): The lower tube 3 is fitted on the main shaft 7 and lowered, and its lower end is fixed to the holding portion of the intermediate bearing 17 as shown in FIG. The upper pipe 4 is fitted on the main shaft 7, lowered downward, hooked to the shoulder 3 </ b> A of the lower pipe 3 by the engaging portion 4 </ b> A, and temporarily placed. A bearing fixing bracket 9 made in a half-split shape is attached so as to surround the main shaft 7,
It is attached to the upper surface of the lower tube 3. Since the gap between the inner periphery of the bearing fixture 9 and the outer periphery of the main shaft 7 is small, the gap between the main shaft 7 and the lower tube 3 is stabilized by attaching the bearing fixture 9. The ceramic bearing 1 is lifted using the bearing lifting bracket 10 to prepare for mounting.

FIG. 3 (Step 2): The ceramic bearing 1 is fitted on the main shaft 7, lowered, placed on the bearing fixing metal 9, and fixed there. The discharge bending pipe 8 is lifted by a crane or the like to prepare for mounting.

FIG. 4 (Step 3): The main shaft insertion portion 8A of the discharge curved tube 8 is fitted to the main shaft 7, and the discharge curved tube 8 is lowered. FIG.
Although not shown, as shown in FIG. 8, the lower flange of the discharge curved pipe 8 is fastened to the upper flange of the upper discharge pipe 12 with bolts. In this state, the ceramic bearing 1
And the spindle insertion portion 8A are separated from each other.

FIG. 5 (Step 4): The ceramic bearing 1 is detached from the bearing fixture 9 and lifted, and is inserted between the bearing sleeve 2 attached to the main shaft 7 and the main shaft insertion portion 8A of the discharge curved tube 8. It is installed inside the lower part of the spindle insertion portion 8A. In this insertion mounting operation, only the ceramic bearing is moved, so that the operation can be easily performed while maintaining the gap as compared with the prior art in which the heavy discharge curved pipe 8 is operated. Therefore, the ceramic bearing is not damaged.

FIG. 6 (Step 5): The bearing fixture 9 is removed from the upper surface of the lower tube 3 and removed. Since the bearing fixture 9 has a half-split shape, it can be separated and removed on both sides of the shaft.

FIG. 7 (Step 6): The upper pipe 4 is lifted, fitted to the outer periphery of the lower part of the main shaft insertion portion 8A of the discharge curved pipe, and held in that state. Loosen the set screw 11 with hexagonal hole of the fixing ring 6 attached to the lower end of the upper pipe 4, and fix the fixing ring 6
Lift and hold. Attach the retaining ring 5 having a half-split shape to the groove of the lower tube 3, lower the fixing ring 6, which has been lifted down, to cover the retaining ring 5 so that it does not fall off, and tighten the hexagon socket set screw 11. The fixing ring 6 is fixed. The lower end of the upper tube 4 is supported by the retaining ring 5 and is prevented from falling downward. As a result, the upper tube 4 is supported and fixed in a raised state.

[0020]

In the upper structure of the vertical pump according to the present invention, the shaft protection tube is concentrically overlapped with the lower tube having an upper end at a position below and below the bearing mounting portion and the outer periphery of the lower tube. An upper tube is divided into an upper tube and an engaging portion for engaging the upper tube with the lower tube when the upper tube is pulled down is provided between the upper tube and the lower tube, and the upper tube is pulled up when the upper tube is pulled up. A mechanism for supporting the pipe is provided on the lower pipe, and a bearing fixture for temporarily placing and fixing a ceramic bearing on the upper face of the lower pipe is detachable. The lower end is fitted to the main shaft and fixed to the holding portion of the intermediate bearing. The upper tube of the shaft protection tube is fitted to the main shaft, and it is engaged with the lower tube and temporarily placed. Attach a bearing fixture to the upper surface of the lower tube. A ceramic bearing is fitted to the main shaft, fixed to the bearing fixture, and temporarily placed. The discharge bending pipe is lowered downward through the main shaft passing portion of the discharge bending pipe, and its lower flange is fastened to the upper flange of the upper discharge pipe. The ceramic bearing is detached from the bearing fixture and lifted and assembled into the inner surface of the lower end of the main shaft insertion part of the discharge curved pipe. Remove the bearing bracket. The temporarily placed upper tube is lifted and its upper end is fitted to the outer periphery of the lower end of the main shaft insertion portion of the discharge curved tube, and the lower end is supported by the lower tube via the above-mentioned support mechanism. Assemble in this order. Since the mounting work of this ceramic bearing is an operation only for the ceramic bearing,
The work can be easily performed while maintaining the clearance between the main shaft and the bearing, as compared with the related art in which the discharge curved pipe which is a heavy object is operated. Therefore, breakage of the ceramic bearing at the time of assembly can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a peripheral portion of a ceramic bearing of a vertical pump according to an embodiment of the present invention.

FIG. 2 is an explanatory view of an assembling step of an upper structure of the vertical pump according to the present invention, and is a view showing a step 1;

FIG. 3 is an explanatory view of an assembling step of an upper structure of the vertical pump according to the present invention, and is a view showing a step 2;

FIG. 4 is an explanatory view of an assembling step of the upper structure of the vertical pump according to the present invention, and is a view showing a step 3;

5 is an explanatory view of an assembling step of an upper structure of the vertical pump according to the present invention, and is a view showing a step 4. FIG.

FIG. 6 is an explanatory view of an assembling step of the upper structure of the vertical pump of the present invention, and is a view showing a step 5;

7 is an explanatory view of an assembling step of the upper structure of the vertical pump according to the present invention, and is a view showing a step 6. FIG.

FIG. 8 is a longitudinal sectional view of a conventional vertical pump.

FIG. 9 is an enlarged view of a portion IX in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceramic bearing 2 Bearing sleeve 3 Lower pipe of upper shaft protection pipe 3A shoulder part 4 Upper pipe of upper shaft protection pipe 4A engaging part 5 Stop ring 6 Fixing ring 7 Main shaft 8 Discharge curved pipe 8A Main shaft insertion part of discharge curved pipe REFERENCE SIGNS LIST 9 Bearing fixing bracket 10 Bearing lifting bracket 11 Hexagon socket screw 12 Upper discharge pipe 13 Lower discharge pipe 14 Guide blade assembly 15 Suction port 16 Impeller 17 Intermediate bearing 18 Upper shaft protection pipe 19 Lower shaft protection pipe

Claims (2)

[Claims] 1. A discharge curved pipe having a main shaft insertion portion, a lower flange of which is bolted to an upper flange of an upper discharge pipe, and a main shaft inserted and mounted between the main shaft and the main shaft insertion portion of the discharge curved pipe. A vertical pump comprising a ceramic bearing incorporated into the inner surface of the lower end portion, and a shaft protection tube covering the main shaft and the ceramic bearing mounting portion and having a lower end fixed to a holding portion of an intermediate bearing through which the main shaft passes. In the upper structure, the shaft protection tube is divided into a lower tube having an upper end at a position below the bearing mounting portion and an upper tube concentrically overlapping the outer periphery of the lower tube, and the upper tube is pulled down. When the upper pipe is engaged with the lower pipe, an engaging portion is provided between the upper pipe and the lower pipe, and a mechanism for supporting the upper pipe when the upper pipe is pulled up is provided on the lower pipe. And a ceramic bearing on the upper surface of the lower tube. An upper structure of a vertical pump, wherein a bearing fixing bracket that can be temporarily temporarily fixed is detachable. 2. The method for assembling an upper structure of a vertical pump according to claim 1, wherein the lower structure including the upper discharge pipe and the intermediate bearing and the main shaft passing through the intermediate bearing are already assembled. A method of assembling a superstructure of a vertical pump, comprising assembling in the following order. The lower tube of the shaft protection tube is fitted to the main shaft, and the lower end thereof is fixed to the holding portion of the intermediate bearing. The upper tube of the shaft protection tube is fitted to the main shaft, and it is engaged with the lower tube and temporarily placed. Attach a bearing fixture to the upper surface of the lower tube. A ceramic bearing is fitted to the main shaft, fixed to the bearing fixture, and temporarily placed. The discharge bending pipe is lowered downward through the main shaft passing portion of the discharge bending pipe, and its lower flange is fastened to the upper flange of the upper discharge pipe. The ceramic bearing is detached from the bearing fixture and lifted and assembled into the inner surface of the lower end of the main shaft insertion part of the discharge curved pipe. Remove the bearing bracket. The temporarily placed upper tube is lifted and its upper end is fitted to the outer periphery of the lower end of the main shaft insertion portion of the discharge curved tube, and the lower end is supported by the lower tube via the above-mentioned support mechanism.