CN211491336U - Core pulling tool for main water feeding pump of nuclear power plant - Google Patents

Abstract

The utility model belongs to the field of machinery, concretely relates to loose core instrument that is used for nuclear power plant owner to feed water pump. The device comprises: the guide rail, the free end pump cover fixing frame, the drawing hand wheel and the driving end disassembly pipe supporting frame. The free end pump cover fixing frame slides on the guide rail, and a bottom plate of the drawing hand wheel is fixedly connected with the inner side of the guide rail. The drawing hand wheel is cylindrical, penetrates through the central through hole of the fixing block, and is fixedly connected with the bottom plate. The free end pump cover fixing frame is semicircular, a transverse bulge is arranged at the intersection of the free end pump cover fixing frame and the circle, and the lower end of the transverse bulge is connected with a longitudinal sliding plate which slides on a sliding rail. The device ensures that the guide rail and the pump core package are drawn out in parallel with the axis of the pump shell, and avoids damage to components. The tool is convenient to erect, the core pulling efficiency is improved, the pump parts are prevented from being rubbed, and the field use effect is excellent.

Description

Core pulling tool for main water feeding pump of nuclear power plant

Technical Field

The utility model belongs to the field of machinery, concretely relates to loose core instrument that is used for nuclear power plant owner to feed water pump.

Background

A pressure-level pump of a main water feeding pump of a square-family mountain nuclear power unit and a front pump thereof belong to a single-stage double-suction barrel shell type centrifugal pump. In the core cladding process of the cylinder pump, if the control is not good, the core cladding is easy to be blocked or parts are easy to be damaged. Not only causing equipment damage, but also seriously delaying the construction period. In order to ensure that the pump core bag can be smoothly drawn out when the pump is disassembled, the core-pulling tool with the guide rail and the roller is designed, so that the guide rail and the pump core bag are kept to be drawn out in parallel with the axis of the pump shell, and the damage to parts is avoided. The tool is convenient to erect, the core pulling efficiency is improved, the pump parts are prevented from being rubbed, and the field use effect is excellent.

Disclosure of Invention

1. The purpose is as follows: the core-pulling tool can enable the core cladding of the main water feed pump to be smoothly drawn out of the cylinder.

2. The technical scheme is as follows:

a be used for nuclear power plant owner to feed water pump instrument of loosing core, includes: the guide rail, the free end pump cover fixing frame, the drawing hand wheel and the driving end disassembly pipe supporting frame. The free end pump cover fixing frame slides on the guide rail, and a bottom plate of the drawing hand wheel is fixedly connected with the inner side of the guide rail.

The drawing hand wheel is cylindrical, penetrates through the central through hole of the fixing block, and is fixedly connected with the bottom plate.

The guide rails are arranged on the left and right sides, are transversely arranged, and are symmetrically provided with 9 evenly distributed holes.

The free end pump cover fixing frame is semicircular, a transverse bulge is arranged at the intersection of the free end pump cover fixing frame and the circle, and the lower end of the transverse bulge is connected with a longitudinal sliding plate which slides on a sliding rail.

The perforation spacing is similarly equal to the length of each stage of the dismounting pipe.

The lower end of the guide rail is longitudinally and fixedly connected with a connecting column.

The whole frame construction that is of drive end dismantlement pipe support frame, top fixed connection supporting roller, the bottom even has the reinforcement strip.

3. The effect is as follows: the core-pulling tool is used for more than ten times on site, the use condition is very good, and core pulling and back installation are smooth.

Drawings

FIG. 1 schematic view of a free end core-pulling guide rail

FIG. 2 drive end dismounting tube support

In the figure: 1. a guide rail; 2. a free end pump cover fixing frame; 3. the hand wheel is drawn out.

Detailed Description

The following detailed description of the patent refers to the accompanying drawings and specific embodiments:

fig. 1 shows a design of a free end core-pulling guide rail, which mainly comprises a guide rail 1, a free end pump cover fixing frame 2, a pulling hand wheel 3 and a driving end dismounting pipe support frame. During core pulling, the tool is fixed on a free end pump shell support by bolts. The guide rails 1 at the two ends are symmetrically provided with 9 evenly distributed holes, and the distance between the holes is similar to the length of each stage of the dismounting pipe. The core pulling device is used for accurately controlling and timely adjusting the core pulling process, and ensures that the pump shell is not jammed and pulled.

Fig. 2 the drive end detaches the tube support bracket for support of the drive end during extraction of the pump core package. According to the extraction progress, 9-level dismounting pipes are sequentially installed on the end cover of the bearing box at the driving end, so that the core package at the driving end is supported on the support, and the pump shaft and the pump shell are ensured to be kept axially parallel in the extraction process.

The specific installation process is as follows:

as shown in fig. 1, when the pump is disassembled, after all accessory devices and pipelines such as the bearing lubricating oil pipeline, the breathing cap, the machine seal cooler pipeline, the pump cooling water jacket pipeline, the instrument, the cable, the coupling and the like are removed, the core-pulling guide rail is assembled on the special adapter plate of the free-end shell support of the pump.

At the drive end of the pump, a pressing plate bolt for fixing the pump cover and the inner shell is taken down, four pressing plates are detached, and an adapter plate is installed on a bearing box cover at the drive end;

and fixing the first-stage dismounting pipe on the bearing end cover adapter plate, and mounting a pump dismounting pipe support frame on the drive end pump shell support.

The heights of the free end core-pulling guide rail 1 and the idler wheel of the support frame of the drive end dismounting pipe are adjusted to ensure that the weight of the pump core package can completely fall on the idler wheel, and the pump shaft is parallel to the central line of the shell.

And screwing down a screw nut in the middle of the first-stage dismounting pipe to enable the inner shell at the driving end to move to be tightly attached to the impeller. Even if the flow channel of the impeller at the driving end is equal to 0, the inner shell at the driving end is tightly attached to the impeller.

Because the gap value of the flow passages at the two ends of the impeller is between 2 and 3mm, and then 5mm self-made steel pads are added in the bearing cover at the free end, the pump core package can move to the free end to reserve a necessary distance. And a pressure plate is arranged on the outer side of the bearing end cover, and a screw rod and a nut are arranged in the center of the pressure plate and connected with a pump shaft. And screwing a central nut of the pressing plate to enable the tightly held drive end inner shell and the impeller to move towards the free end together and to be tightly attached to the free end, and at the moment, the flow channels at the two ends are changed into 0. The whole rotor core package is held tightly and can be drawn out.

At the free end of the pump, a semicircular fixing frame is arranged at the lower part of the pump cover, so that the track base is tightly attached to the pump base, and meanwhile, the support feet at the outer side of the track are well adjusted, the guide rail is leveled, and the guide rail is ensured to be parallel to the pump shaft. The 4 pins were mounted to the first two pairs of holes on the traction rail.

And a free end bearing end cover is provided with a drawing hand wheel, the hand wheel is rotated anticlockwise, and the pump core package is drawn out slowly. Once the movement is initiated, the force of turning the handwheel must be monitored and if the resistance increases, an adjustment must be made. The drive end cylinder support and free end yoke height are adjusted to offset any deflection as the cylinder is extracted.

When the stop plates on two sides of the pump cover semicircular fixing frame are in contact with the first pair of stop pins, the core wrap abuts against the first group of stop pins, and the first-stage dismounting pipe is installed at the driving end of the pump. And repeating the steps, sequentially increasing and connecting the subsequent dismounting pipes according to the extraction progress, and slowly extracting the pump core package along the track. During extraction, the radial clearance between the core package and the barrel needs to be observed to ensure that the barrel is still concentric with the core package. And when the pump core package is completely drawn out of the barrel, lifting lugs and the like can be installed to lift the pump core package out.

Claims (7)

1. A core pulling tool for a main water feeding pump of a nuclear power plant comprises: guide rail (1), free end pump cover mount (2) take out hand wheel (3) and drive end and dismantle pipe support frame, its characterized in that: the free end pump cover fixing frame (2) slides on the guide rail (1), and a bottom plate of the drawing hand wheel (3) is fixedly connected with the inner side of the guide rail (1).

2. The core pulling tool for a main water feeding pump of a nuclear power plant as claimed in claim 1, characterized in that: the drawing-out hand wheel (3) is cylindrical, the drawing-out hand wheel (3) penetrates through the central through hole of the fixing block, and the fixing block is fixedly connected with the bottom plate.

3. The core pulling tool for a main water feeding pump of a nuclear power plant as claimed in claim 1, characterized in that: the guide rails (1) are arranged on the left and right sides in total, are transversely arranged and are symmetrically provided with 9 evenly distributed holes.

4. The core pulling tool for a main water feeding pump of a nuclear power plant as claimed in claim 1, characterized in that: the free end pump cover fixing frame (2) is semicircular, a transverse bulge is arranged at the intersection of the free end pump cover fixing frame and the circle, and the lower end of the transverse bulge is connected with a longitudinal sliding plate which slides on a sliding rail.

5. The core pulling tool for a main water feeding pump of a nuclear power plant as claimed in claim 3, characterized in that: the perforation spacing is similarly equal to the length of each stage of the dismounting pipe.

6. The core pulling tool for a main water feeding pump of a nuclear power plant as claimed in claim 1, characterized in that: the lower bottom surface of the guide rail (1) is longitudinally and fixedly connected with a support column.

7. The core pulling tool for a main water feeding pump of a nuclear power plant as claimed in claim 1, characterized in that: the whole driving end dismounting pipe support frame is of a frame structure, the top of the driving end dismounting pipe support frame is fixedly connected with a support roller, and the bottom of the driving end dismounting pipe support frame is connected with a reinforcing strip.

Images