CN205824177U - A kind of Thermal generation unit hermetic seal oil catch - Google Patents

Abstract

This utility model provides a kind of novel hermetic seal oil catch, position, intermediate oil return chamber is kept off at crude oil, be passed through one be dried, purify, room temperature and the air of constant voltage, one air-tight chamber is formed between twice tooth, pressurized seal is utilized effectively to stop steam outside bearing housing to leak into bearing housing, solve to intake in oil problem, can be effectively sealed in bearing housing by the turbine oil in bearing housing, prevent leaking of steam turbine oil.

Description

A kind of Thermal generation unit hermetic seal oil catch

Technical field

This utility model relates to coal fired power generation machine technology field, especially relates to a kind of Thermal generation unit airtight Oil sealing keeps off.

Background technology

At home in thermal power plant, in order to prevent the outside seepage of lubricating oil and suction in Steam Turbine bearing chamber Water vapour and dust outside bearing chamber mix in bearing indoor oil, are necessary for guaranteeing the sound position of bearing block Tightness.Typically oil catch is all used to seal.Oil catch is made up of inside and outside two groups of oil sealing teeth and oil-recovery tank, often group Oil catch tooth has 2～4 road copper coin bars or aluminium strip to be embedded on oil catch body, in its effect is prevention bearing housing The outside seepage of lubricating oil.The mode that oil catch fitting recess or bolt are fixed is arranged on the end of bearing housing, this Sealing Technology is widely used in active service unit.But owing to self exists design defect, depositing in various degree In leakage (oozing) oil phenomenon, cause bigger harm: one is that leakage (oozing) oil pollutes environment, leaks (oozing) -4 meter faces are flowed to along condenser outer wall after spilling at oil catch；Two is that leakage (oozing) oil chance high-temperature component is easily sent out Light a fire calamity；Three pol loss being the increase in steam turbine oil, exacerbate the pressure of production cost；Four is axle envelope Gas leakage enters in bearing housing, and high pressure cylinder shaft envelope is to prevent high steam from spilling along rotor, end vapour The inside and outside differential pressure that envelope is born is bigger, must have one in order to avoid sound parts generation abrasion at axle envelope simultaneously Fixed gap, will necessarily cause axle envelope to have gas leak phenomenon, causes shaft-packing leakage to cause band in oil to bearing housing Water, oil return globule phenomenon sometimes on existing bearing shell oil return window, cause emulsification of lubricant to cause bearing shell to burn out, lubrication Oil parts get rusty.Very big hidden danger is brought to the safe and stable operation of unit.

Oil catch leakage of oil main cause:

A local oil returning tube layout is unreasonable, causes oil return not smooth, and in bearing chamber, tiny structure is formed and is obstructed, Lubricating oil along gap between axle journal and oil catch to leaking.

B smoke exhaust undercapacity or run unreasonable formation pressure-fired.

C oil catch excesssive gap, it is not enough that bearing chamber forms negative pressure.

D bearing block the most concentric with big axle (Wa Wo center) makes the gap with big axle up and down of oil catch differ Cause.

E is when steam turbine accident and planned shut-down, and cylinder of steam turbine temperature is higher, and rotor is down to bend, in order to Do not make rotor by permanent bend, barring gear rotor must be put into and turned by dish.Just because of rotor has amount of deflection, institute All can wear and tear in various degree with the sound position of rotor, oil catch is worn big position, gap all can leakage of oil.

During f steam turbine operation, the running orbit of axle is elliptical shape.Steam turbine is opened, in stopping process, when Rotating speed is when critical speed, and rotor oscillation amplitude is maximum.In transverse direction, rotor certainly will wear and tear gear piece And making seal clearance become big, then turbine oil drains to outside bearing housing, and gland packing leakage enters bearing housing.

Hazardness:

Oil is thrown to, at high pressure cylinder insulation, be easily caused ignition at insulation.Close on protection and the control line of insulation Road will be burned, and is turned off time serious.

Suction steam and dust main cause in lubricating oil:

A generally has oil catch excesssive gap.Tiny structure in bearing chamber sucks in the steam and air that axle leak sealing goes out Dust.

Asymmetric (cylinder dividing plate deformation displacement during overhaul in Wa Wo center, b oil catch position.Rotor and dividing plate centering Time rotor movement cause).

When c shuts down, rotor has amount of deflection jiggering to cause.

D axle is sealed bad or excesssive gap, and gland packing leakage is big.

It is improper that e axle envelope send vapour to adjust, and axle envelope pump gas ablity is not enough.

Hazardness:

A Water in oil causes at the bottom of the viscosity drop of lubrication.Temperature raises easy bearing liner burnout (oil is destroyed simultaneously).

Containing granularity in b oil more, axle journal tungsten gold is worn, and axle journal is the most easily worn.

C tank bottoms has water (water ratio is great) to cause oxidation rust blocking oil inlet pipe filter screen.

D is general at about 50～60 DEG C because of returning-oil temperature, accelerates Water in oil, accelerates fuel tank inner sleeve face oxygen Change, time serious can oil-break and by forced-stopping machine.

The long-term emulsion type lubricant of the too high lubricating oil of e Water in oil uses the cycle to reduce.

Due to the fault of construction of original copper tooth oil catch, add the abrasion between oil catch and rotor in unit operation, Cause oil catch gap to change, exist and leakage of oil and lubricating oil suck steam and the hidden danger of dust, to steamer The safe and stable operation of unit brings hidden danger.

Utility model content

The purpose of this utility model is to provide a kind of contactless hermetic seal oil catch, solve oil catch leakage of oil, In oil, water inlet problem, can be effectively sealed on the turbine oil in bearing housing in bearing housing, prevent steam turbine oil Leak.

To achieve these goals, this utility model provides a kind of Thermal generation unit hermetic seal oil catch, including Oil catch outer shroud, external tooth, oil catch internal ring, together with described external tooth is bolted to connection with oil catch outer shroud； The downside of described oil catch outer shroud is peripherally disposed several grooves, arranges in oil catch in groove Ring, is provided with yielding spring between described oil catch internal ring and groove；At oil catch internal ring with the bottom of external tooth along round If circumferential direction is inlaid with dry seal tooth；Oil catch outer shroud forms an equal pressure chamber with outer between cog, under equal pressure chamber Side is provided with concentration nozzle；Described oil catch outer shroud and oil catch internal ring are contactless, described oil catch internal ring circumference On be additionally provided with internal ring radial clearance adjustment block.

Further, described sealing tooth is alloy or prepared by brass material.

The beneficial effects of the utility model:

1, simple installation hermetic seal oil catch is made up of inner and outer ring, when outer shroud has big difference for oil catch low-lying area nest, Adjusting, internal ring can be finely adjusted, and is finally reached ideal value.

2, safe and reliable

(1) hermetic seal oil catch is designed to contactless, will not injure big axle, not result in shaft vibration.

(2) traditional fan's formula oil catch exists, during jiggering bottom crown have being worn in various degree, for Prevent bottom to be worn, have been loaded with avoiding device when design.

(3) even if instrument gas breaks down, oil catch is then equivalent to conventional oil catch, its sealability also phase When in conventional oil catch.

3, easy to maintenance

Hermetic seal oil catch is provided with internal ring radial clearance adjustment block, it is ensured that internal ring and big shaft concentricity, adjusts extremely Convenient.

4, seal thoroughly

Can thoroughly solve leakage of oil, oil mixed with water, it is to avoid particulate matter enters bearing housing.

5, can adjust by work seal

If unit occurs abnormal causing to seal copper odontotripsis greatly, seal clearance becomes big, can be by adjusting air inlet Amount realizes the adjustment sealed, it is not necessary to shut down process because gap becomes big.

Accompanying drawing explanation

Fig. 1 is the structural representation of this utility model a kind of Thermal generation unit hermetic seal oil catch；

Description of reference numerals: 1 oil catch outer shroud, 2-external tooth, 3 oil catch internal ring, 4 compression springs,

5 seal tooth, 6 equal pressure chambers.

Detailed description of the invention

Below in conjunction with the accompanying drawings this utility model one Thermal generation unit hermetic seal oil catch is further described: This example is merely to illustrate this utility model rather than limits scope of the present utility model, people in the art Member belongs to what the application claims were limited to the amendment of the various equivalent form of values of the present utility model Scope.

A kind of Thermal generation unit hermetic seal oil catch, including oil catch outer shroud 1, external tooth 2, oil catch internal ring 3, Together with described external tooth 2 is bolted to connection with oil catch outer shroud 1；The downside of described oil catch outer shroud 1 Peripherally disposed have several grooves, arranges oil catch internal ring 3 in groove, described oil catch internal ring 3 with It is provided with compression spring 4 between groove, is along the circumferential direction inlaid with in the bottom of oil catch internal ring 3 with external tooth 2 If dry seal tooth 5；Compression spring 4 is set and can effectively compensate the wear extent sealing tooth 5 in operation, with Time be suitable for the vibration in rotor shutdown process, both can ensure that oil catch internal ring 3 and rotating shaft part under what operating mode in office Between gap be always " zero ", the friction between sealing tooth 5 and rotating shaft can be made again to be minimized, reduce Seal the turnover rate of tooth；Described sealing tooth 5 is prepared for alloy or brass material；

Form an equal pressure chamber 6 between oil catch outer shroud 1 and external tooth 2, be provided with concentration spray in the lower section of equal pressure chamber 6 Mouth 7；In the theoretical basis of active-type sealed oil blocking, introduce compressed gas, make gas along journal surface Form the annular air film that multiple tracks rigidity is powerful, as soft shielding, effectively stop turbine oil to leak outside along axle journal；

Described oil catch outer shroud 1 is contactless with oil catch internal ring 3, will not injure big axle, not result in axle Vibration；Being additionally provided with internal ring radial clearance adjustment block on described oil catch internal ring 3 circumference, internal ring radial clearance adjusts Block, it is ensured that internal ring and big shaft concentricity, it is the most convenient to adjust.

Work process: instrument compressed air is incorporated into automatic steam trap；Gas is adjusted through manual modulation valve Pressure, viewing Pressure gauge；Pressure air enters into the inner upper therapeutic method to keep the adverse QI flowing downwards of oil catch internal ring 3；After compression ring is full of pressure, then Being assigned to the all-round journal surface of oil catch from compression ring, form zone of positive pressure at oil catch with axle journal position, pressure is complete Full the oil catch of seepage outward being prevented leakage in bearing housing, the water vapour that axle envelope leaks out simultaneously is also by oil catch Pressure at crown blocks, and stops and enters in bearing block.During jiggering, gauge pressure is in 0.03～0.05MPa, when When rotor goes up 3000 turns, gauge pressure is 0.3～0.5MPa.Because oil catch crown forms malleation, axle with bearing shell face Oil in bearing is blocked by malleation, it is impossible to external leakage.The dust of gland packing leakage and air does not the most definitely enter axle Hold internal contamination lubricating oil,

Using Contact Tooth and damascene copper tooth inside oil catch, outside uses damascene copper tooth oil catch.In oil return after transformation Two sides, chamber car goes out groove, along the circumferential direction slips into dividing plate, is separated out equal pressure chamber, is in operation, at oil catch Oil back chamber top is passed through air by blowdown pipe and enters equal pressure chamber, and produces pressure between axle journal.Under pressure, Lubricating oil in bearing housing is blown in case, it is impossible to spill；Extraneous steam or impurity by air to case Outer direction blows out, it is impossible to enter in bearing housing, thus reaches bearing housing outwards leakage of oil, extraneous steam, Impurity also cannot be introduced in case.Thoroughly solve to lubricate at bearing housing oil mixed with water, the phenomenon that particle water degree exceeds standard.

Hermetic seal oil catch compressed air, uses from instrument place with gas requirementSteel pipe attracts, and passes throughLatus rectum Gas source triplet is layed under steam turbine platform parallel with oil pipe after filtering, then transferSteel pipe is along bearing housing Oil return pipe arrives at bearing housing oil catch；Have on hermetic seal oil catchShort steel pipes interface and valve and Pressure gauge phase Connect.Debug air pressure again, make hermetic seal oil catch reach the sealing effectiveness of optimum.

Claims (2)

1. a Thermal generation unit hermetic seal oil catch, including oil catch outer shroud (1), external tooth (2), oil catch internal ring (3), together with described external tooth (2) is bolted to connection with oil catch outer shroud (1)；The downside of described oil catch outer shroud (1) is peripherally disposed several grooves, arranges oil catch internal ring (3) in groove, is provided with yielding spring (4) between described oil catch internal ring (3) and groove；At oil catch internal ring (3) and external tooth (2) if bottom be along the circumferential direction inlaid with dry seal tooth (5)；Form an equal pressure chamber (6) between oil catch outer shroud (1) and external tooth (2), be provided with concentration nozzle (7) in the lower section of equal pressure chamber (6)；It is characterized in that, described oil catch outer shroud (1) is contactless with oil catch internal ring (3), and described oil catch internal ring (3) circumference is additionally provided with internal ring radial clearance adjustment block.

A kind of Thermal generation unit hermetic seal oil catch the most according to claim 1, it is characterised in that described sealing tooth (5) is alloy or prepared by brass material.