KR830001331B1 - Nuclear reactor coolant pump having a tooling boom - Google Patents

Abstract

A pump(12), for nuclear reactor coolant, has a boom(30) used for transferring pump components during maintenance operations. The pump has drive motor(14) & a motor stand(20) with openings in it. An articulated arm(32) is attached to the stand at one end and has another and which can extend so that a gripping mechanism(34) engages pump components. The arm can move so that the components are transferred through the openings in the motor stand. Disconnection of the motor stand from the pump is avoided.

Description

Reactor coolant pump with tooling boom

1 is a partial front view of a reactor coolant pump.

2nd front view of the tooling boom.

3rd plan view of the tooling boom.

4 is taken along the line IV-IV of FIG.

5 is another plan view of the tooling boom.

The present invention relates to a reactor coolant pump, and more particularly, to a reactor coolant pump having a tooling boom for moving a pump component.

In the reactor, the coolant pump circulates the coolant between the reactor and the steam generator.

Reactor coolant pumps generally consist of a pump housing that encloses the pump portion along with an electric motor housing that encloses the motor portion, mounted by a motor stand, perpendicular to the pump housing.

The motor has a vertical drive shaft extending downward, which is coupled with the vertical axis of the pump.

In this way, the electric motor rotates its drive shaft to rotate the pump shaft, thereby circulating the coolant through the reactor apparatus. Regular operation of pump components, such as shaft seals, after operation is usually required. In a coolant pump, in which the motor drive shaft is directly connected to the pump shaft, the motor stand and motor housing are lifted by the crane to the pump housing. It is necessary to separate the drive shaft from the pump shaft and separate the motor stand from the pump housing so that the pump components can be accessed.

In other pumps, commonly known as spool pumps, when the spacers or spools are connected between the motor drive shaft and the pump shaft and thus are separated from the drive shaft and the pump shaft, the spool does not separate the motor stand from the pump housing and It can be removed horizontally through the hole of the motor stand without lifting the motor stand. To remove the spool horizontally, some metal rails are placed horizontally through and supported by the holes in the motor stand. Next, a conventional lifting equipment that can lift the pump component vertically is attached to the horizontal rail. When the pump components are lifted, the rollers attached to the lifting equipment are used to roll the pump components off the horizontal rails and outward through the holes in the motor stand.

While it is possible to use this system to remove pump components from a reactor coolant pump, it may be undesirable under certain circumstances because of the complexity of the location of the coolant pump in the reactor.

This complicated condition hinders the extension of the rail into a position that allows easy access to the pump components. Moreover, the time required to assemble and disassemble such conventional systems makes the reactor downtime very long.

Therefore, the main object of the present invention is to provide a reactor coolant pump in which necessary maintenance work can be carried out more quickly and easily.

In this respect, the present invention provides a motor stand mounted to a pump and having an opening, a motor mounted on the motor stand having a vertical drive shaft connected to the drive shaft of the pump and driving the pump by the pump shaft and the drive shaft. In a vertical pump having a tooling boom, one end is attached to the motor stand 20, the other end which can extend to the vertical pump shaft 26, the components of the pump 12 With articulating arm 32 attached with a grip mechanism 34 for holding and moving the components through the opening 22 of the motor stand 20. Provide a reactor coolant pump.

The present invention will become more apparent from the following description of the embodiments described with reference to the accompanying drawings.

1 shows a reactor coolant pump drive structure 10 disposed between a pump 12 and an electric motor 14.

The pump 12 includes a pump housing 16 that encloses components of the pump 12, such as the vertical pump shaft 18. An electric motor stand 20 having an opening 22 is bolted to the pump housing 16 to support the electric motor 14. The motor 14 is enclosed in a motor housing 24 that is bolted to the motor stand 20. The motor 14 is therefore supported vertically from the pump 12 by the motor stand 20. The electric motor 14 has a vertical drive shaft 26 extending toward the pump shaft 18.

The spool 28 acts as a spacer between the drive shaft 26 and the pump shaft 18. The spacer provides space between the drive shaft 26 and the pump shaft 18 so that the bolt can be dismantled and removed horizontally, thereby allowing access to other parts of the pump 12. When powered, the electric motor 14 rotates the drive shaft 26 and thus rotates the pump shaft 18. Rotation of the pump shaft 18 causes the reactor coolant to circulate between the reactor and the steam generator, all of which can be readily understood by those skilled in the art.

Referring to FIGS. 1, 2, 3, the tooling boom, shown at 30, has articulated arms 32 and grips for removing components, such as spool 28, from the motor stand 20 through openings 22. Grip) mechanism 34. Articulated arm 32 includes a bracket 36 that is bolted to motor stand 20.

1, 2, and 3 illustrate that the bracket 36 is attached to the inside of the motor stand 20, the bracket 36 may be attached to the outside of the motor stand 20. A horizontal rod 38 of a single member or one or more members movably connected is pivotally attached to the bracket 36 by pins 40. A bearing 42 may be disposed in the horizontal rod 38, and the pin 40 may be rotatably disposed in the bearing so that the pin 40 can be rotated in the horizontal plane by the horizontal rod 38.

The grip mechanism 34 has a mounting member 44 attached at the end of the horizontal bar 38 opposite to the bracket 36. The threaded member 46 having a threaded groove over its entire length is free from the first end 48 disposed in the threaded portion of the mounting member 44 and the threaded groove and can slide on another portion of the mounting member 44. It has a second end 50 disposed therein. The first end 48 is provided such that the threaded member 46 advances with respect to the mounting member 44 by screwing and the second end 50 slides with respect to the mounting member 44 when he rotates. It has a screw groove that engages the screw groove of 44). Mounting member 44 carries the weight of threaded member 46 and the components attached thereto. A sleeve 52 is rotatably mounted to the threaded member 46 between the first end 48 and the second end 50. The support 54, which may in fact be a member having a circular curvature, has first and second shoulders 56 and 58, each of which has a hole in which the thread member 46 and the sleeve 52 are disposed. Have The first nut 60 is screwed to the first end 48 such that the lower end of the sleeve 52 is held in place, and the second nut 62 is similarly disposed at the second end 50. The sleeve 52 and the support 54 when the first nut 60 rotates to closely contact the bottom of the sleeve 52 and the second nut 62 similarly rotates to closely contact the top of the sleeve 52. Is firmly fixed to the screw member 46. Also washers are arranged between the first nut 60 and the bottom of the sleeve 52 and between the second nut 62 and the top of the sleeve 52.

Thus, the vertical position of the support 54 relative to the screw member 46 is determined according to the positioning of the first nut 60 and the second nut 62. However, because the sleeve 52 extends through the first shoulder 6 and the second shoulder 58, which are integral with the support 54, the support 54 is formed of the first nut 60 and the second nut ( Even when 62) is firmly fixed in place, it can pivot in the horizontal plane with respect to the threaded member 46. Thus, by positioning the first and second nuts 60 and 62 with respect to the screw member 46, the support 54 can be moved perpendicularly to the screw member while maintaining the horizontal turning capability. Of course, since the first end 48 is screwed to the mounting member 45 as it rotates, the screw member 46 and the support 54 can be moved perpendicular to the horizontal bar (38). The first binding mechanism 64 is attached to the support 54 by the first attachment 66 and the second binding mechanism 68 is attached to the support 54 by the second attachment 70.

Binding mechanisms 64 and 68 may be selected from those well known in the art and may be ratchet buckles manufactured by "Ancra Company, California". The first fastening mechanism 64 has a first strap 72 made of nylon and the strap is attached to the first fastening mechanism 64 in position 74 and turns around the component to be supported by the support 54. Extends toward the second binding mechanism 68 and contacts the first binding mechanism 64 in the ratchet mechanism 76. The ratchet mechanism 76 has a handle 78 connected thereto, and reciprocating the handle causes the first strap 72 to tighten tightly around the component. The second binding mechanism 68, which operates similarly to the first binding mechanism 64, also has a second strap 80 extending at a different height than the first strap 72 around the component to be moved. In addition, a handle 82 may be attached to the handle of the binding mechanisms to provide a good lever for tightening the straps.

In FIGS. 1, 2 and 3, the support 54 is a component to be moved so that the straps 72 and 80 support the weight of the component vertically while stabilizing the component and preventing the component from rotating. It has a notch 84 designed to contact the surface of it. One or more notches 84 may be provided at various locations on the support 54 such that the support 54 can support components of various shapes and sizes vertically. It may also be movably mounted on the support 54 to allow the spacer 86 to be moved in contact with the component. The spacer 86 not only vertically supports the component to be moved, but also stabilizes the component to prevent the component from rotating. The adjustable spacer 86 can support components of various shapes and sizes.

In Figures 1 and 4, the lifting device 90, which is bolted to the motor stand 20 so that two parallel rails 88 extend above the tooling boom 30, can be a chain-sprocket device such as an electric machine. Is attached to the rail 88 in parallel with the pump shaft 18. The lifting device 90 vertically moves the component to be moved so that the component is at the same height as the tooling boom 30 so that the tooling boom 30 moves the component through the opening 22 of the motor stand 20. Gives you the ability to move.

5 shows another embodiment of a tooling boom 30 in which the articulated arm 32 has two movable segments and is attached to the outside of the motor stand 20.

Both embodiments can perform the same function, are interchangeable and can be used together. When used together, the tooling boom mounted inside the motor stand 20 moves a component through the opening 22 where it is delivered to an external tooling boom that continues to move it further. By using both tooling booms, you can work in a larger range of behavior and area.

work

After operation, some components of the pump 12, such as shaft seals (not shown), need to be repaired or replaced. If this is desired, the tooling boom 30 may be mounted to or permanently mounted to the motor stand 20 as described above.

The articulated arm 32 then pivots toward the spool 28 and the grip mechanism 34 is moved near the spool 28. At this time, the notches 84 or spacers 85 are aligned with the appropriate surface of the spool 28 so that they contact each other. The support 54 can then be moved relative to the threaded member 46 by the first nut 60 and the second nut 62. Next, the threaded member 46 is rotated to be advanced perpendicular to the horizontal rod 38.

The support 54 attached to the threaded member 46 is also advanced. Thus, threaded material 46 is advanced until notch 84 or spacer 86 contacts spool 28. Next, the first strap 72 and the second strap 80 extend around the spool 28 and are in contact with the binding mechanism 64 or 68 respectively. Then, using the handles of the binding mechanisms, tighten the first strap 72 and the second strap 80 to be in close contact with the spool 28. The spool 28 is then separated from the drive shaft 26 and the pump shaft 18. The spool 28 can then be moved horizontally through the opening 22 of the motor stand 20 by pivoting the tooling boom 30 as shown in FIG. 28 may be removed from the motor stand 20. In contrast, the spool 28 may be moved to a location between the drive shaft 26 and the pump shaft 18. Other configurations surrounding the pump shaft 18 The parts can similarly be moved by first moving the component vertically by the lifting device 90. The lifting device 90 is roughly aligned with the spool 28 so that the tooling boom 30 can access the components. It acts to vertically move the component to the same height.

Accordingly, the present invention provides a reactor coolant pump integrally with a tooling boom capable of moving pump components through openings in the motor stand so that maintenance can be performed more quickly and easily.

Claims (1)

A vertical pump having a motoring stand mounted to a pump and having an opening, a tooling boom having a vertical drive shaft connected to the drive shaft of the pump and mounted to the motor stand and driving the pump by the pump shaft and the drive shaft, the joint The arm 32 is attached to the motor stand 20 at one end thereof, and the lower end thereof can extend to the vertical pump shaft 26, and at the other end thereof, the same configuration as the spool 28 of the pump 12 is provided. A reactor coolant pump with a tooling boom, characterized in that a grip mechanism 34 is attached to hold the components and move the components through the openings 22 of the motor stand 20.

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