CN204900312U - LNG low temperature immersed pump bearing - Google Patents

Abstract

The utility model discloses a LNG low temperature immersed pump bearing, including bearing inner race, bearing inner race, bearing ball and bearing retainer, bearing retainer and bearing ball establish between bearing inner race and bearing inner race, bearing ball is located bearing retainer, its characterized in that: bearing inner race and bearing inner race all adopt X105CrMo17 special type stainless steel to make, bearing ball adopts ceramic ball to make, bearing retainer adopts polyimide to make. An object of the utility model is to provide a have better hardness, low temperature resistivity, resist high warm nature, fatigue resistance, thermal diffusivity and the mechanical characteristic that resistance to wears, can normally work in the low temperature operational environment of LNG low temperature immersed pump, guarantee the life's of LNG low temperature immersed pump LNG low temperature immersed pump bearing.

Description

LNG low temperature immersed pump bearing

Technical field

The utility model relates to a kind of LNG low temperature immersed pump parts, and more particularly, it relates to a kind of LNG low temperature immersed pump bearing.

Background technique

LNG Liquefied natural gas (LiquefiedNaturalGas is called for short LNG), has become the new industry of China's energy field fast development.LNG Liquefied natural gas become adjustment Energy Mix, alleviate major action to the dependence of oil supply and pressure, guarantee Chinese energy safety.In the whole industrial chain of LNG, the links such as its output, transhipment, reception, utilization all will use LNG low temperature immersed pump, and this makes LNG low temperature immersed pump in industrial chain, play very important role.China there is no the LNG low temperature immersed pump of independent research at present, and built LNG project all employs external imported product.External LNG low temperature immersed pump cost and Cost of repair and maintenance all higher, be unfavorable for the sound development of China LNG industry.Therefore, understand and progressively research and develop production domesticization LNG low temperature immersed pump and the parts thereof with independent intellectual property right, particularly important to the sound development of China development LNG industry.

Bearing is the important component part of any rotating machinery global design.The operational condition of LNG low temperature immersed pump bearing is very harsh, bear the low temperature of-162 DEG C, and cannot carry out external lubrication.Simultaneously due to working environment and the restriction of maintenance condition, LNG low temperature immersed pump must possess high rotating speed and long-life feature, and the technological requirement thus manufacturing and assemble is higher.Traditional bearing producer major part adopts alloy or combined bearing, and use the LNG low temperature immersed pump of this bearing that comparatively galling and send larger noise can occur after running a period of time, effect is undesirable.Simultaneously under the low-temperature operation condition of-162 DEG C, the metallographic structure of traditional bearing changes, bearing steel ring surface hardness and wear resistance famine, work long hours down, bearing rolls ditch and easily occurs various damage, cause LNG low temperature immersed pump normally to work, normally carrying out of LNG low temperature immersed pump work can not be met.

At present, notification number is the LNG low temperature immersed pump that the Chinese patent of CN203009316U discloses a kind of full-ceramic bearing.The rotation core component of the LNG low temperature immersed pump of this full-ceramic bearing is full-ceramic bearing, and this full-ceramic bearing can be low temperature resistant-200 DEG C.This method to some extent solves traditional bearing and normally cannot to work under the low-temperature operation condition of-162 DEG C this problem, but this patent does not illustrate this core component of full-ceramic bearing, poor to the directive significance of real operation.Simultaneously the bearing inner race of this full-ceramic bearing, bearing outer ring and retainer all use pottery, and in the using process of LNG low temperature immersed pump, hardness is lower, frangible, poor practicability.

Model utility content

For the deficiency that prior art exists, the purpose of this utility model is to provide one to have good hardness, low temperature resistivity, high temperature resistance, fatigue resistance, thermal diffusivity and mechanical property of resistance to wearing, normally can work in the low-temperature working environment of LNG low temperature immersed pump, guarantee the LNG low temperature immersed pump bearing in the working life of LNG low temperature immersed pump.

For achieving the above object, the utility model provides following technological scheme: a kind of LNG low temperature immersed pump bearing, comprise bearing inner race, bearing outer ring, bearing ball and retainer, described retainer and bearing ball are located between bearing inner race and bearing outer ring, described bearing ball is positioned at retainer, it is characterized in that: described bearing inner race and bearing outer ring all adopt X105CrMo17 special stainless steel to make, described bearing ball adopts ceramic ball to make, and described retainer adopts polyimide to make.

Adopt said structure, the bearing inner race be made up of X105CrMo17 special stainless steel and bearing outer ring, can improve the hardness of bearing inner race and bearing outer ring, heat-resisting quantity, lower temperature resistance, passivation.The change of LNG low temperature immersed pump operating temperature does not affect the precision of bearing, thus improves the fatigue resistance of bearing inner race and bearing outer ring, reduces distortion and the damage of bearing inner race and bearing outer ring, increases the working life of LNG low temperature immersed pump.The bearing ball be made up of ceramic ball, its density is the half of steel ball, thus can improve the rotational velocity of bearing.The use of ceramic ball can reduce friction contact load, reduces the degree of heat in collision and running.Ceramic ball uniform in material, can bring up to the best by the fatigue resistance of bearing and bring good seal compression effect.The retainer be made up of polyimide, has splendid mechanical property of resistance to wearing.This kind of LNG low temperature immersed pump bearing has good hardness, fatigue resistance, thermal diffusivity and mechanical property of resistance to wearing, and normally can work, guarantee the working life of LNG low temperature immersed pump in the low-temperature working environment of LNG low temperature immersed pump.

Preferably, containing curing molybdenum layer on the surface in described polyimide.

Adopt said structure, in retainer, be added with molybdenum disulfide, thus there is lower frictional property, reduce the degree of heat in running.Be applicable to low temperature environment, its working environment can be low to moderate 4K simultaneously.

Preferably, containing nonmetallic substance layer on the outer surface of described X105CrMo17 special stainless steel.

Adopt said structure, this bearing inner race and bearing outer ring can guarantee the hardness of minimum 58HRC, thus improve the fatigue resistance of X105CrMo17 special stainless steel, make this bearing inner race and bearing outer ring available under-260 DEG C to 315 DEG C environment.

By adopting technique scheme, there is following beneficial effect:

1. there is good hardness, low temperature resistivity, high temperature resistance, fatigue resistance, thermal diffusivity and mechanical property of resistance to wearing, normally can work in the low-temperature working environment of LNG low temperature immersed pump, guarantee the working life of LNG low temperature immersed pump.

2. friction is less, has good thermal diffusivity.

Accompanying drawing explanation

Fig. 1 is the perspective view of the utility model LNG low temperature immersed pump bearing;

Fig. 2 is the perspective view (removal unit two-part bearing outer ring) of the utility model LNG low temperature immersed pump bearing.

Wherein, 1, bearing inner race; 2, bearing outer ring; 3, bearing ball; 4, retainer.

Embodiment

Referring to figs. 1 through Fig. 2, the utility model LNG low temperature immersed pump bearing is described further.

A kind of LNG low temperature immersed pump bearing, comprises bearing inner race 1, bearing outer ring 2, bearing ball 3 and retainer 4.This bearing ball 3 is positioned at retainer 4, and retainer 4 is located between bearing inner race 1 and bearing outer ring 2.

This bearing inner race 1 and bearing outer ring 2 all adopt X105CrMo17 special stainless steel to make.This X105CrMo17 special stainless steel is by vacuum arc remelting process.First X105CrMo17 special stainless steel is pressed into electrode, then electrode is carried out melting in vacuum electric smelting furnace, make electrode at high temperature melting rapidly, finally the electrode after melting is placed in the water-cooled copper crystallizer being placed with nonmetallic substance and solidifies again, form the X105CrMo17 special stainless steel wrapped up by nonmetallic substance layer.The nonmetallic substance layer be made up of carbon, silicon, the content mass ratio of carbon, silicon is 1:1.X105CrMo17 special stainless steel after vacuum arc remelting process, its steel internal gas component content reduces, and metalloid content increases, and can guarantee the hardness of minimum 58HRC, thus improve the fatigue resistance of metal, to ensure that it is available under-260 DEG C to 315 DEG C environment.Therefore, this LNG low temperature immersed pump bearing normally can work in the low-temperature working environment of LNG low temperature immersed pump, guarantees the working life of LNG low temperature immersed pump.

This bearing ball adopts ceramic ball to make, and its density is the half of steel ball, thus can improve the rotational velocity of bearing.The use of ceramic ball can reduce friction contact load, reduces the degree of heat in collision and running.Ceramic ball uniform in material, can bring up to the best by the fatigue resistance of bearing and bring good seal compression effect.

This retainer adopts polyimide to make.Be added with molybdenum disulfide in this polyimide, molybdenum disulfide is evenly dispersed in polyimide.The retainer be made up of polyimide, has splendid mechanical property of resistance to wearing.With the addition of molybdenum disulfide, thus have lower frictional property, its operating temperature can be low to moderate 4K.

The above is only preferred implementation of the present utility model, protection domain of the present utility model be not only confined to above-described embodiment, and all technological schemes belonged under the utility model thinking all belong to protection domain of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (3)

1. a LNG low temperature immersed pump bearing, comprise bearing inner race, bearing outer ring, bearing ball and retainer, described retainer and bearing ball are located between bearing inner race and bearing outer ring, described bearing ball is positioned at retainer, it is characterized in that: described bearing inner race and bearing outer ring all adopt X105CrMo17 special stainless steel to make, described bearing ball adopts ceramic ball to make, and described retainer adopts polyimide to make.

2. LNG low temperature immersed pump bearing according to claim 1, is characterized in that: containing curing molybdenum layer on the outer surface of described polyimide.

3. LNG low temperature immersed pump bearing according to claim 1 and 2, is characterized in that: containing nonmetallic substance layer on described X105CrMo17 special stainless steel outer surface.