JPH0874797A - Jig for suspend vertical shaft pump - Google Patents

Abstract

PURPOSE: To provide a jig for suspend a vertical shaft pump for more safely easily assembling and installing a pump case and a motor case for the vertical shaft pump with less assembling man-hour. CONSTITUTION: The heads of at least two stud bolts 2a and 2c interposed with spaced intervals in the peripheral direction on the axial end faces of a pump case are provided with guides 3a and 3c having different axial length each other. The inserting position for the stud bolt-inserting hole 11 of the other stud bolt 2 is established by inserting the stud bolts 2a and 2c in the respective stud-bolt inserting holes 11 of a motor case 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly of a vertical axis boiler circulation pump (hereinafter referred to as vertical axis pump) for transferring high temperature and high pressure hot water of a steam turbine generator such as a thermal power plant.
Concerning the structure of the lifting jig that lifts the vertical shaft pump during inspection.

[0002]

2. Description of the Related Art FIG. 4 is a structural view showing a partially broken surface of a vertical shaft pump, FIG. 5 is a structural sectional view of a pump portion, and FIG. 6 is a lifting view of a motor case. Now, the vertical shaft pump of the steam turbine generator has a temperature of 300 to 350 ° C. and a pressure of about 3
It is used in the harsh atmosphere of transferring high temperature and high pressure hot water of 00 kg / cm ² . This vertical shaft pump is shown in FIGS.
As shown in FIG. 6, the pump case 6 that houses the rotating part such as the impeller 5 that rotatably transfers the hot water transferred to the pump suction port 63 of the vertical shaft pump through the boiler downcomer 62 to the pump discharge port 64. And a motor case 1 containing a motor 12 for rotating the rotating portion and a rotary shaft 121. Since this vertical pump requires easy assembly and inspection of the rotating part in the pump case 6 and the motor 12 that drives this rotating part, the pump case 6 and the motor case 1 have a disassembleable structure. Has become.
That is, 20 to 20 in the circumferential direction of the axial end surface of the pump case 6.
The 30 high-strength stud bolts 2 provided are inserted into the stud bolt insertion holes 11 provided in the flange 61 of the motor case 1, and the nuts 9 are used by using an unillustrated hydraulic pump and a tightening jig. The end surface of the pump case 6 and the joint surface A of the flange 61 of the motor case 1 are brought into surface contact with each other to be firmly joined.

By the way, in the above-mentioned inspection of the vertical shaft pump, a bearing provided with an impeller wear ring 7 and a case wear ring 8 for preventing leakage of hot water from the gap between the impeller 5 and the pump case 6 in FIG. The periodical inspection and renewal of the insulation of the parts and the motor 12 are performed. For this purpose, when the vertical shaft pump is disassembled, a part below the flange surface A, including the impeller 5 in the pump case 6 and the rotating part of the rotary shaft,
That is, the motor 12 and the motor case 1 are separated from the pump case by removing the nut 9 that fastens the stud bolt 2, and the lifting ear 15 provided on the outer wall of the motor case 1 shown in FIG. It is hung on the ground below by the wire 14 arranged on the retainer 16.

On the other hand, after the inspection, when the motor 12 and the motor case 1 are lifted and assembled and joined to the pump case 6, first, as in the case of the above-described hanging, as shown in FIG. The wire 14 is lifted up using the hoisting hoist 10 provided on the beam 13, including the impeller 5 inside the pump case 6 and the rotating part of the rotating shaft as described above. Pump case 6 and motor case 1 after hoisting
As described above, the stud bolt insertion hole 11 in the flange 61 portion of the motor case 1 is used for the connection at the flange 61 portion.
Then, the stud bolt 2 provided in the circumferential direction of the axial end surface of the pump case 6 is inserted into the pump case 6, and the nut 9 is tightened.

[0005]

As described above, the pump case 6 and the motor case 1 after the vertical shaft pump is disassembled and inspected.
In assembling the above, 20 to 30 stud bolts 2 provided in the circumferential direction of the end face of the pump case 6 are inserted into the corresponding stud bolt insertion holes 11 and tightened and joined by the nut 9. Since the axial lengths of the stud bolts 2 are all the same, it is necessary to insert all the stud bolts 2 into the stud bolt insertion holes 11 of the flange 61 at the same time. It took time. Moreover,
Vertical shaft pumps for thermal power plants are usually installed at heights of several tens of meters above the ground.At such high places, scaffolding is narrow and work places are limited.Assembling and installation of heavy vertical shaft pumps. Had the problem of being very difficult.

An object of the present invention is to provide a jig for lifting a vertical shaft pump which solves the above-mentioned problems and which can be assembled and installed in a safer and easier manner with less man-hours for assembling.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is designed so that a stud bolt of a pump case can be inserted and guided in a stud bolt insertion hole of a flange portion of a motor case. Guides having different lengths are attached to the heads of at least two stud bolts provided in the circumferential direction of the axial end surface of the pump case.

Further, it is preferable that the guide attached to the stud bolt is provided via an intermediate joint arranged on the head of the stud bolt in the axial direction.

Further, when the attachment of the stud bolt and the guide, the attachment of the stud bolt and the intermediate bolt, and the attachment of the intermediate bolt and the guide are screwed,
It is still preferable.

[0010]

According to the present invention, when connecting the pump case and the motor case, it is possible to simultaneously insert all the stud bolts provided in the pump case into the stud bolt insertion holes of the flange portion of the motor case as in the conventional case. Not necessarily required, in the circumferential direction of the axial end surface of the pump case,
If the positions of the stud bolt insertion holes to be inserted in at least two stud bolts arranged at intervals can be set, the positions of the stud bolt insertion holes to be inserted in the other stud bolts are unique. It focuses on the fact that it will be fixed.

That is, at least two Sudat bolts arranged at intervals in the circumferential direction of the axial end surface of the pump case described above, before the tips of the other stat bolts reach the flange surface A of the motor case. It suffices to insert them into the respective Sudat bolt insertion holes. To this end, the length of the at least two sudat bolts in the axial direction is increased, and a guide of a predetermined length is attached to the head of the sudat bolt so as to serve as a guide to be inserted into the sudat bolt insertion hole. With the structure, the above-mentioned object of the present invention is achieved.

Further, since the length adjustment of the stat bolt to which the above-mentioned guide is attached can be performed by arranging the guide through an intermediate joint arranged on the head of the stud bolt in the axial direction, it is possible to adjust the length of the guide. It is effective when increasing the total length.

Further, the guide attached to the stud bolt, the intermediate joint, and the guide attached to the intermediate joint are respectively screwed to each other so as to be attachable / detachable, so that the attachment and the stud bolt are inserted into the stud bolt insertion holes. There is an advantage that the work for removing the guide can be easily performed.

[0014]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a partial cross-sectional view in which a stud bolt 2 is inserted into a stud bolt insertion hole 11 provided in a motor case 1 using a vertical pump lifting jig according to a first embodiment of the present invention. 2 is a sectional view taken along line II-II of FIG. The drawings correspond to FIGS. 4 to 6 of the related art, respectively, and the same parts as those of the related art are denoted by the same reference numerals and detailed description thereof will be omitted.

The stud bolts 2a, 2b and 2c shown in FIG.
The guides 3a, 3b and 3c provided on the
As shown in FIG. 5, all the stud bolts 2 provided on the axial end surface of the motor case 1 are divided into three equal parts in the circumferential direction, and each axial length L ₁ , L ₂ and L ₃ have different lengths. Also, the stud bolts 2a of the guides 3a, 3b and 3c,
The connecting portion with 2b and 2c is provided with a screw portion 21 on the inner peripheral side so as to be screw-connected with each other. When the motor case 1 is lifted as shown in FIG. 6, the stud bolt 2 is inserted into the stud bolt insertion hole 11 of the flange 61 of the motor case 1, and the motor case 1 and the pump case 6 are assembled and joined together, the stud is first formed. Before the other stud bolt 2 comes into contact with the flange joint surface A (FIG. 4) of the motor case 1, the guide 3a having the longest guide length L ₁ is provided in the axial direction of the head of the bolt 2a. 3a is inserted into the corresponding stud bolt insertion hole 11, and the stud bolt 2
Determine the insertion position of a.

Next, the motor case 1 is gradually lifted around the guide 2a provided with the guide 3a inserted into the stud bolt insertion hole 11 as an axis, and the guide 3c having the second guide length L ₃ is provided. The guide 3c is introduced into the insertion hole 11 corresponding to the stud bolt 2c. Since the positions of the stud bolts 2a and 2c are determined by the above steps,
All other stud bolts 2 can be inserted into the stud bolt insertion holes 11 to be inserted.

Since the guide 3 used in the present invention has the function of the guide inserted into the stud bolt insertion hole 11 as described above, for that purpose, the radius of the tip is small and circular as shown in FIG. It is more effective that the shape of the guide has a shape, and as the material of the guide, it is not necessary to have a particular tightening force, so that a normal steel material can be used.

When the motor case 1 and the pump case 6 are assembled and joined as described above, it is difficult to determine the axial centers of the motor case 1 and the pump case 6 with one stud bolt 2a, so at least the stud. Bolt 2
L with a short guide length that is separated from a by a plurality in the circumferential direction
Second stud bolt 2c provided with _three guides 3c
It becomes necessary to perform positioning on both sides. However, as described above, the motor case 1 to be lifted is operated by the flange 61 when the work is performed at a height of several tens of meters above the ground.
Since it is a heavy object having an impeller 5 on its upper part, the two guides described above have parallelism between the flange surface A of the motor case 1 and the shaft end surface of the pump case 6 corresponding to this joint surface at the time of lifting. Keep all other stud bolts 2
It is a very difficult work to insert the into the insertion hole 11. Therefore, as shown in FIG. 1, by using the stud bolt 2b having the third guide 3b, the work of inserting the guide 2 into the insertion hole 11 at three locations can prevent the axial center deviation, and the more stable work can be achieved. it can.

Now, the stud bolt 2 of the pump case 6
Is inserted into the stud bolt insertion hole 11 of the motor case 1, and after the end surface of the pump case 6 is brought into surface contact with the joint surface A of the flange 61 of the motor case 1, the heads of the stud bolts 2a, 2b and 2c. The guides 3a, 3b and 3c provided on the above are removed, and as shown in FIG. 5, all the stud bolts 2 are tightened and joined by nuts 9 to complete the work.

FIG. 3 shows a sectional view of a jig for lifting a vertical shaft pump according to a second embodiment of the present invention. As shown in FIG. 3, a guide 3 is provided on the head of the stud bolt 2 via an intermediate joint 4. The intermediate joint 4 is effective in increasing the guide length in order to facilitate the insertion work of the guide 2 into the stud bolt insertion hole 11, and by interposing the intermediate joint 4,
The guide portion L ₄ inserted into the stud bolt insertion hole 11 can be set long.

Similar to the guide 3, the intermediate joint 4 is provided with screw portions 41 and 42 so that the outer peripheral portion of the stud bolt 2 and the inner peripheral portion of the guide 3 are screwed together. Similar to the guide 3 of the first embodiment,
The longer the guide 3 is, the easier it is to insert it into the stud bolt insertion hole 11. However, if the guide length is too long,
Since the length is limited by the gap length of the end surface B facing the flange 61 of the motor case 1, the guide 3 may not be removable after the stud bolt 2 is introduced into the stud bolt insertion hole 11. Therefore, as described above, the intermediate joint 4 attached to the stud bolt 2 and the guide 3 attached to the intermediate joint 4 are configured to be screw-joined as described above, and each of the guides 3 has a detachable structure. And intermediate joint 4
Can be easily removed.

[0022]

As described above, in the present invention, the pump case is provided so that the stud bolt of the pump case can be inserted and guided into the stud bolt insertion hole of the flange portion of the motor case of the vertical shaft pump. At least two stud bolts in the circumferential direction are fitted with guides having different axial lengths, and these guides are inserted into the corresponding stud bolt insertion holes, so that the other stud bolts should be inserted. The hole position can be set. This facilitates the assembly work such as determining the position and axial center of the pump case and the motor case of the vertical shaft pump at a height of several tens meters above the ground.

Further, since the apparent length of the stud bolt including the guide can be increased by providing the guide, the wire for lifting the motor case can be lengthened to lower the motor case at a lower position. Since it can be inserted into the stud bolt insertion hole, it is also effective in improving work safety. Thereby, for example, even in the work of installing the impeller wear ring 7 and the case wear ring 8 respectively provided in the impeller 5 and the pump case 6 which are the bearing portions of the impeller described above, with a minute gap being maintained,
Since the motor cases can be hoisted and joined without shifting the position and axis of the pump case, it is possible to prevent the motor cases from coming into contact with each other and damaging them.

Further, when the guide is attached to the stud bolt, the guide length can be set long by arranging the guide through the intermediate joint, which facilitates the work of setting the position of the stud bolt insertion hole. In addition, the joints of the guide and intermediate joint that are attached to the stud bolts have a screw joint structure and are removable so that the guides can be easily removed. It is also possible to obtain the effect of reducing the number of man-hours for joining and tightening.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a vertical shaft lifting jig according to a first embodiment of the present invention, in which a stud bolt is inserted into a stud bolt insertion hole.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view of a stud bolt of a vertical shaft pump lifting jig according to a second embodiment of the present invention.

FIG. 4 is a structural diagram showing a partially broken surface of a conventional vertical shaft pump.

FIG. 5 is a sectional view of the configuration of a vertical pump unit.

FIG. 6 is a hoisting view of a motor case of a vertical shaft pump.

[Explanation of symbols]

 1 Motor case 2 Stud bolt 2a Stud bolt 2b Stud bolt 2c Stud bolt 21 Screw part 3 Guide 3a Guide 3b Guide 3c Guide 4 Intermediate joint 41 Screw part 42 Screw part 5 Impeller 6 Pump case 61 Flange 9 Nut 11 Stud bolt insertion hole

Claims (3)

[Claims] 1. A plurality of stat bolts provided in a circumferential direction of an axial end surface of a pump case are inserted into stud bolt insertion holes of a flange portion of a motor case, and the stud bolts are tightened with nuts in the axial direction of the pump case. In a vertical axis pump lifting jig that axially lifts a vertical axis pump integrally joined with an end surface and a flange surface of a motor case, guides having different axial lengths have at least two or more stud bolt heads. A jig for lifting a vertical shaft pump, wherein the jig is capable of being inserted and guided in the stud bolt insertion hole of the flange portion of the motor case. 2. The vertical shaft hoisting jig according to claim 1, wherein the guide attached to the stud bolt is provided via an intermediate joint arranged on the head of the stud bolt in the axial direction. Vertical shaft lifting jig. 3. The vertical shaft hoisting jig according to claim 1 or 2, wherein the stud bolt, the guide and the intermediate joint are screwed together. .