CN108858057A - Non-integral pouring type generator unit outlet casing tube locknut loads and unloads specific purpose tool - Google Patents

Abstract

The invention discloses a special tool for loading and unloading the outlet bushing lock nut of a non-integral pouring type generator set, comprising: a tool body, an adjusting bolt, and a handle. The tool body is a ring formed by integral turning of No. 45 steel. The height does not exceed the height of the outlet casing lock nut; 8 through holes are evenly arranged on the side wall circumference of the tool body, of which A, B, C, D four holes are screw holes with a diameter of φ16mm, and the remaining four The hole diameter is φ20mm; the handles are four, with a length of 250mm and φ20mm, which are respectively welded in the four holes with a diameter of φ20mm; When the special tool is used to tighten the lock nut, the force is applied evenly, the force on the gasket is uniform, the compression of each part is uniform, and the pressure on the gasket will not exceed the maximum moment of its plastic deformation, achieving a good sealing effect.

Description

Special tools for loading and unloading casing lock nuts of non-integral pouring generator sets

technical field

The invention belongs to the field of equipment used in power plants, specifically a special tool for loading and unloading outlet sleeve lock nuts, and more specifically a special tool for loading and unloading outlet sleeve lock nuts of non-integral pouring generator sets. The stator current is an important component leading from the inside of the generator to the outside of the generator. In addition to being able to withstand a certain hydrogen pressure, it should also be able to withstand high voltage and high current and have good performance of sealing, vibration resistance and moisture resistance.

Background technique

Zhangjiakou Power Plant Units 1 to 8 generator outlet bushings belong to TEPCO’s early products. They adopt a non-integral pouring structure. The bushings rely on gaskets to seal the hydrogen inside the generator from leakage. However, with the increase in operation time, The gasket of the generator outlet bushing is gradually aging due to the influence of high temperature and oil pollution, and hydrogen leakage occurs. Although the gasket is replaced by the opportunity of maintenance or unit shutdown, due to the irregular process of loading and unloading the casing each time, a bent bolt is used to replace the gasket. Insert the lock nut hole, and then hit the bolt with a hammer to tighten or loosen the lock nut. This non-standard loading and unloading process causes repeated hydrogen leakage from the bushing within a short period of time after the gasket is replaced, resulting in waste of resources. A hydrogen explosion will occur, threatening the safety of people and equipment. In response to this defect, we specially customized a casing lock nut loading and unloading tool. After replacing the gasket, the lock nut will be evenly locked, the gasket will be evenly stressed, and the compression of each part will be even. The pressure of the gasket will not exceed its The maximum moment of plastic deformation achieves a good sealing effect.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a simple structure, convenient assembly and disassembly, to avoid the tightness of outlet bushing caused by violent demolition.

A special tool for loading and unloading the lock nut of the outlet bushing of the non-integral pouring generator set with damaged gasket.

In order to achieve the purpose of the above invention, this utility model is realized by adopting the following technical scheme: a special tool for loading and unloading the outlet bushing lock nut of the non-integral pouring generator set, including: a tool body, an adjusting bolt, and a handle. The tool body is used for 45 The ring formed by overall turning of grade steel, the thickness from the inner diameter to the outer diameter is not less than 25mm, the inner diameter is 2mm larger than the outer diameter of the outlet bushing lock nut, and the height does not exceed the height of the outlet bushing lock nut; the tool body There are 8 through holes evenly arranged on the circumference of the side wall, among which the four holes A, B, C, and D are screw holes with a diameter of φ16mm, and the diameter of the remaining four holes is φ20mm; the handles are four, and the length is 250mm. φ20mm, respectively welded in four holes with a diameter of φ20mm; the adjustment bolts are threaded with the screw holes with a diameter of φ16mm; the diameter of the adjustment bolts is smaller than A'B'C'D' on the outlet casing lock nut When removing the lock nut, put the special tool on the outside of the outlet sleeve lock nut, make the four screw holes respectively aligned with the four holes of the outlet sleeve lock nut, and tighten the adjustment bolt with a φ16 bolt, so that the end of the adjustment bolt The parts are clipped into the four A'B'C'D' holes outside the outlet bushing lock nut; at this time, the staff symmetrically grasp the operating lever to tighten or loosen the outlet bushing lock nut. In this way, the staff exerts even force, and when two people operate the lock nut of the outlet sleeve, the compression of the sealing pad just reaches the best sealing effect.

The invention has the advantages of simple structure, convenient assembly and disassembly, and convenient maintenance, and effectively prolongs the service life of the outlet bushing lock nut and gasket.

Description of drawings

Fig. 1 is a structural diagram of a generator outlet bushing and a lock nut of the present invention.

Fig. 2 is a structural diagram of the special tool of the present invention.

Fig. 3 is a combination diagram of disassembling and assembling lock nuts using special tools according to the present invention.

Fig. 4 is a top view of the outlet bushing lock nut of the present invention.

101, outlet casing, 102, sealing gasket, 103, buffer blue plate, 104, sealing ring, 105, outlet casing lock nut, 106, conductive rod, 107, tool body, 108, adjusting bolt, 109, handle.

Detailed ways

The present invention will be further elaborated below in conjunction with the accompanying drawings.

Figures 1 to 4 are the preferred forms of the present invention, which show the special tool for loading and unloading the outlet casing lock nut of the non-integral casted generator set, including: tool body, adjusting bolt, handle, and the tool body is No. 45 The ring formed by integral turning of steel, the thickness from the inner diameter to the outer diameter is not less than 25mm, the inner diameter is 2mm larger than the outer diameter of the outlet bushing lock nut, and the height does not exceed the height of the outlet bushing lock nut; the side of the tool body There are 8 through holes evenly arranged on the circumference of the wall, among which the four holes A, B, C, and D are screw holes with a diameter of φ16mm, and the diameter of the remaining four holes is φ20mm; the handles described are four, the length is 250mm, and the diameter is φ20mm , respectively welded in four holes with a diameter of φ20mm; the adjustment bolts are threaded with the screw holes with a diameter of φ16mm; the diameter of the adjustment bolts is smaller than that of A'B'C'D' on the outlet casing lock nut When disassembling the lock nut, put the special tool outside the lock nut of the outlet bushing, make the four screw holes respectively align with the four holes of the lock nut of the outlet bushing, and tighten the adjusting bolt with a φ16 bolt so that the end of the adjusting bolt Snap into the four A'B'C'D' holes outside the outlet bushing lock nut; at this time, the staff symmetrically grasp the operating lever to tighten or loosen the outlet bushing lock nut. In this way, the staff exerts even force, and when two people operate the lock nut of the outlet sleeve, the compression of the sealing pad just reaches the best sealing effect.

The tool has been fully verified in the inspection and replacement of gaskets (102) for Units 1 to 8 of Zhangjiakou Power Plant, and will not cause hydrogen leakage defects due to poor sealing of gaskets (102) due to irregular construction techniques.

Claims (1)

1. non-integral pouring type generator unit outlet casing tube locknut loads and unloads specific purpose tool, including：Tool body, adjustment bolt, hand Handle, it is characterised in that：The tool body is the annulus made of No. 45 steel entirety turning, and the thickness of internal diameter to outer diameter is not small In 25mm, internal diameter is greater than the outer diameter 2mm of outlet casing tube locknut, is highly no more than the height of outlet casing tube locknut；The tool 8 through-holes are evenly arranged on the side wall circumference of body, wherein tetra- bore dias of A, B, C, D be φ 16mm screw hole, remaining four Bore dia is φ 20mm；The handle is four, length 250mm, φ 20mm, is respectively welded at four that diameter is φ 20mm In a hole；The adjustment bolt is threadedly engaged with the screw hole that diameter is φ 16mm；The diameter of the adjustment bolt is less than The aperture of A ' B ' C ' D ' on thread casing locknut.