CN2116986U

CN2116986U - Insulator drain pipe of generator rotor

Info

Publication number: CN2116986U
Application number: CN 92200628
Authority: CN
Inventors: 左淑兰; 叶文安
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-01-15
Filing date: 1992-01-15
Publication date: 1992-09-23

Abstract

The utility model relates to the insulating drain pipe of the rotor of a generator, which is composed of a pipe joint, a large and small clamp rings, a screw cap, a polytetrafluoroethylene pipe, a metallic liner pipe, and a glass fibre reinforced plastics hoop, wherein, the metallic liner pipe is mainly used for bearing water pumping pressure, and the polytetrafluoroethylene pipe is mainly used for bearing the action of electrical insulation; the seal of the pipe joint, the seal of a plastic pipe, and the seal of the metallic liner pipe are designed on the same part in an overlapped type; under the action of the compression screw cap, the large and small clamp rings generate embedding and wedging actions along the conical surface of a pipe joint body. An experiment proves that the structure which has the advantages of reliable insulating performance, 30 MPa bearing ability, and permanent service life can meet the requirements of the use performance of the insulating drain pipe of the rotor coil of a large scale generator.

Description

Insulator drain pipe of generator rotor

The utility model relates to electric generator rotor coil water cooling insulation aqueduct, and this pipe will have the good insulation performance performance, and heatproof durability energy is wanted to bear the non-leakage performance of 20MPa hydraulic pressure, and this desirable homogenous material does not also have now.

Current useful rubber of generator rotor insulation aqueduct or plastic tube for solving the generator amature high pressure that produces in service, just adopt interlayer braided fiber or wire netting jacket structure to strengthen bearing capacity.But these pipes are appellation " flexible pipe " all, and its weak point is that caliber size can change with bearing the pressure size variation, and unit opens left alone without help machine number of times more than, aqueduct breathing cycle-index is also many, the aging aliquation phenomenon of coming unglued will take place thereupon, cause bearing capacity to descend, seepage will take place.The replacing so be about to begin after the use several years.This is the great quality problems of water cooling generator amature less than the hydrogen-cooled generator rotor.

Polytetrafluoroethylene plastic pipe heatproof is more than 240 ℃ as everybody knows, and ageing-resistant performance is good, and electrical insulation capability is good, and the thick polytetrafluoroethylplastic plastic proof voltage breakdown value of 1mm is more than 30,000 volts, but this pipe can only bear the operating pressure of 1.5MPa.And the pump pressure level of metal tube also is usual thing when 30MPa, but metal tube is an electric conductor.

The design's task is to make a kind ofly to bear very high operating pressure, and can make aqueduct that enough insulation levels are arranged over the ground, and be nonvolatil special insulation aqueduct useful life.

The design adopts metal liner overcoat polytetrafluoroethylplastic plastic tubular construction scheme, the main bearing pump water pressure of metal liner; Teflon tube mainly bears the electric insulation effect.So just can gather pump pressure value height, good insulation preformance the two in one, connect the insulation aqueduct firmly thereby constitute unique liner tube type.

The electrically insulated structures of insulation aqueduct is can not injure in the globality that seals the position plastic tube wall, so sealing position electric insulation is safe.The metal liner insulation against ground is the scheme that adopts lengthening polytetrafluoroethylplastic plastic pipe, utilizes the nipple orifice on the water tank, and insulation distance can accomplish that 60～120mm is long.And don't extension shaft is to installation dimension.

The design's hermetically-sealed construction is such, pipe joint is processed into the smooth garden conical surface, large and small collar is under the thrust of clamp nut, shift to the pipe joint endoporus, so produce the embedding wedging action along the garden conical surface, force large and small collar to do evenly entad garden contraction distortion, firm lock ring is outside the polytetrafluoroethylplastic plastic pipe on the garden; Same teflon tube also produces entad garden contraction distortion under the effect of large and small collar thrust, be pressed on metal liner on sealing garden, position week.Evidence, but more than this hermetically-sealed construction bearing pump pressure testing power 30MPa.

Polytetrafluoroethylplastic plastic is a kind of polymer substance after all, under the double action of temperature and pressure, still can produce micro-creep after 10 years 8 years.So the design is preventing when influencing sealing property, to have adopted embedded crush seal because of creep causes the decline of plastic tube extrusion stress, the termination of large and small collar is that the embedding wedge is among plastic tube body after fastening in other words; And the plastic tube inwall is full in the metal liner sulculus with regard to embedding after being stressed, and such hermetically-sealed construction just can make creep effect disappear, and keeps nonvolatil sealing property.

The design adopts the metal liner structure, and no matter its superiority is the pump water pressure testing or how much opens left alone without help machine several that for metal liner, the variation of caliber size sizes values is always zero.Only this, fundamentally overcome " flexible pipe " structure the intrinsic not high drawback of endurance quality, so just can keep permanent useful life.

Outside the polytetrafluoroethylplastic plastic pipe, also twined the glass stirrup that is coated with epoxide-resin glue on the garden, in order to the mechanical sealing performance of reinforced plastic pipes.Sealing between plastic tube and the bushing pipe also is dual fail-safe like this.

The sealed characteristic of this structure is, the sealing of pipe joint and plastic tube is that the eclipsed form design is on same position, so the small and exquisite economy of insulation aqueduct joint volume facts have proved that axial mounting distance (Decorative drum is to the water tank ring) size also is very easily less than 200mm." flexible pipe " formula structure mounting distance then reaches more than the 400mm.This has not only shortened rotor axial length, and can strengthen the rotor rigidity and improve the rotor resonance frequency, and this point is particularly important on big unit.

Various rubber, the plastics aqueduct of this structure to having moved, undergoing technological transformation also is very easily, only needs change one lower pipe connection 2; And install a transition joint additional in coil-end and just can finish and transformed.This structure also can be used in other similar equipment, as water-cooled generator stator coil Inlet and outlet water insulation aqueduct, only needs in the plastic tube endoporus at two ends water swivel sealing position, and the long metal liner of each suit 20mm just can.And cost is low, just can change assembly work very easily without special tooling.

Below by accompanying drawing the utility model is further specified.

2. 3. metal liner 4. teflon tubes 5. big collar 6. little collar 7. nuts 8. glass fiber bandages of pipe joint (water tank ring end) of 1. pipe joints (coil-end) among the figure

As shown: pipe joint 1 dress is welded on the coil water-in and water-out termination, and pipe joint 2 is contained on the water tank ring.There is sulculus in metal liner 3 outer gardens at the sealing position, are sleeved in polytetrafluoroethylplastic plastic pipe 4 endoporus.Big collar 5, little collar 6, nut 7 is set on the outer garden of plastic tube by direction as shown and position.Outside teflon tube, be wound with the glass fiber bandage 8 that is coated with epoxide-resin glue on the garden.

The design of the positioning end of aqueduct is in pipe joint 1 endoporus in assembling.The aqueduct insulating end should first insertion tube joint 2 holes in, and joint 2 is contained on the water tank ring, aqueduct is pushed away take out positioning end then, and, refill tight insulating end nut 7 successively tight nut 7, last plastic tube outside the garden winding be coated with the glass fiber bandage 8 of epoxide-resin glue.Facts have proved that this hard connection insulation aqueduct is conveniently saved trouble more than " flexible pipe " formula structure in assembly working.

Claims

1, generator rotor insulation aqueduct, form by pipe joint, big or small collar, nut, teflon tube, metal liner, glass stirrup, it is characterized in that: adopt metal liner overcoat polytetrafluoroethylplastic plastic pipe, metal liner mainly bears high hydraulic pressure, plastic tube mainly bears the electric insulation effect, the water resistance length that will insulate, design is in the termination of pressure-bearing metal bushing pipe.

2, generator rotor insulation aqueduct according to claim 1 is characterized in that: adopted large and small collar to carry out crush seal, made the sealing of pipe joint, plastic tube, metal liner, the design that is eclipsed form is on same position.