KR20030056786A - Upper rigid coupling cap screw ejector for reactor coolant pump - Google Patents

Abstract

PURPOSE: An upper rigid coupling cap screw removing apparatus is provided to be capable of assembling and disassembling lower parts of an axial thrust of a nuclear reactor coolant pump. CONSTITUTION: A hexagonal socket(30) and a multiplier(40) are used to remove a cap screw for fixing a rigid coupling(10) hub. A support plate(20) is configured to support various tools. A guide support(60) is configured to prop a rotary force, and a clamp(50) is connected to the guide support at a lower part of the support plate(20). A handle(70) is connected to a lower part of the tool. A washer(90) and a fixing bolt(80) are connected toward the guide support(60) at an upper part of the rigid coupling(10).

Description

Upper rigid coupling cap screw ejector for reactor coolant pump

The present invention relates to an upper rigid couple of a reactor coolant pump for enabling the disassembly and assembly of these lower parts in the inspection of the lower mechanical seals, lower journal bearings, and the like, which are lower parts of the axial thrust protector of the reactor coolant pump in a nuclear power plant. Ring cap screw removal device.

In general, the axial thrust protector installed in the reactor coolant pump of a nuclear power plant has upper and lower thrust bearings that offset axial thrust, upper and lower journal bearings that hold radial thrust, and lubricant in the axial thrust protector. It consists of upper and lower mechanical seals to prevent leakage to the outside.

The axial thrust protector can be divided into upper and lower parts as described above, each part is to be inspected by disassembling every two years, but the current situation is only to check the upper part.

To check the lower parts, the disassembly check shall be carried out by lifting and removing the motor of the reactor coolant pump and lifting the shaft thrust protector separately.

The lifting of the electric motor and the lifting of the axial thrust protector may cause an unnecessary increase in the amount of air. Therefore, a device that can check only the lower parts without lifting the axial thrust protector is needed.

However, in order to overhaul only the lower part, the hub of the rigid coupling connecting the shaft of the axial thrust protector and the pump shaft must be removed.

This rigid coupling hub is securely fastened with nine cap screws on the shaft.

As the coupling hub is located on the upper side, there is a situation that the operator has to support all the tools needed for disassembly from the bottom because the working posture is in the upper position when disassembling the cap screw. Follow the crowd.

In addition, in order to remove and assemble fixed cap screws, tools that increase the tightening force should be used so that they do not sag in the left, right and down directions.

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and the technical problem is to enable the disassembly and assembly of these lower parts in checking the lower mechanical seals, lower journal bearings, etc., which are the lower parts of the axial thrust protector of the reactor coolant pump. An upper rigid coupling cap screw removal device is provided.

1 is a front view of the present invention

※ Explanation of code for main part of drawing

10: rigid coupling 20: support plate

30: hexagon socket 40: multipliers

50: clamp 60: guide support

70: handle 80: fixed bolt

90: washer

The apparatus of the present invention for achieving the above object is shown in FIG.

1 shows the front view of the present invention, and fixes the position of the hexagon socket 30 and the multiplier 40 used for removal of the cap screw for fixing the rigid coupling hub.

The weight of the various tools is formed in such a structure that the tool can be used in close proximity, rather than being supported by the worker.

The weight of the normal tool used in the work is supported by the rigid coupling 10 hub.

When using the tool, support it so that it does not sag left, right and down.

That is, the tool is inserted into nine holes machined in the center of the support plate 20 so that the tool does not shake left and right, and the support plate 20 supports the tool so as not to sag down.

It has durability that can handle the generated rotational force (torque).

At this time, the guide support 60 bears the generated rotational force.

Convenience of movement for easy removal of other cap screws.

The use of the tool is such that no damage is caused to the pump parts.

Minimize the weight of the tool for ease of handling and form it to minimize the number of personnel required.

It is designed to have various compatibility against fluctuations in the air holes used.

In the drawings, reference numeral 50 denotes a clamp, 70 denotes a handle, 80 denotes a fixing bolt, and 90 denotes a washer.

Referring to the operation of the present invention configured as described above are as follows.

First, at the time of initial installation, two guide posts 60 are installed in the rigid coupling 10 hub at 180 ° intervals.

At this time, the guide post 60 is inserted into the hole of the rigid coupling 10 hub, and after the washer 90 is installed, the fixing bolt 80 is fastened.

Thereafter, the support plate 20 is inserted into the guide post 60, and the clamp 50 is inserted and fixed to the end of the guide support so that the support plate does not fall out.

Insert the hexagon socket (30) into the multi-pliers (40).

The hexagon socket inserted into the multiplier is inserted into the hexagonal groove of the cap screw, and then the base plate 20 is adjusted so that the multiplier does not sag.

Install the handle (70) on the multiplier through the through hole in the backing plate. Turn the handle to tighten or loosen the cap screw.

The following describes the procedure for inserting the cap screw.

First, push out the washer 90 tilted under the fixing bolt 80 of the upper portion of the guide support 60, and then move to the top of the fixing bolt to insert.

The guide support 60 and the unit are lowered down so that the hexagon socket 30 comes out of the hexagonal groove of the cap screw.

The hexagon socket 30 and the multiplier 40 are moved to the cap screw for the next operation.

The guide support 60 and the unit are lifted up so that the hexagon socket 30 fits in the hexagonal groove of the cap screw.

Remove the washer 90 fitted to the top of the fixing bolt (80) and insert it back to the bottom.

After installing the handle 70 to the multiplier 40 through the through hole of the support plate 20, turn the handle to tighten or loosen the cap screw.

The present invention described above is possible to perform the inspection of the lower parts of the axial thrust protector in the technical aspect, it is possible to pre-check and replace the wear, damage parts.

Then, the oil leakage factor of the axial thrust protector can be removed.

In addition, economically, the continuous operation and stability of the equipment is secured, thereby maximizing utilization of nuclear power plants, reducing maintenance manpower and capacity, and contributing to increasing convenience of maintenance.

In addition, safety can be ensured by reducing fatigue at the time of protecting and inspecting parts.

Claims (1)

In constructing an apparatus for removing the top rigid coupling 10 cap screw of the reactor coolant pump, A hexagon socket (30) and a multiplier (40) used for removal of the rigid coupling (10) hub fixing cap screw; A support plate 20 for supporting the weight of the various tools; A guide support 60 for supporting the rotational force; A clamp 50 fastened to the guide support 60 at the bottom of the support plate 20; A handle 70 fastened to the bottom of the tool; The upper rigid coupling cap screw removal device of the reactor coolant pump, characterized in that consisting of; washer (90) and fixing bolt (80) fastened toward the guide support (60) from the top of the rigid coupling (10).