JPS59117997A - Method of lubricating pressure receiving portion of high-speed rotor - Google Patents

Abstract

PURPOSE:To effectively cool and lubricate the pressure receiving portion of a high-speed rotor by using oil emulsion as a lubricant, which has comparatively high viscosity with a base of water which has low viscosity and good specific heat. CONSTITUTION:Water-base emulsion containing oil with comparatively high viscosity is used as a lubricant. Oil is supposed to have viscosity of at least more than 7cSt at 100 deg.F. If it is less than 7cSt, an oil drop in emulsion can not form an oil film having sufficient strength at the pressure receiving surface of a high-speed rotor. If oil is water-base emulsion, 30% (vol.%) of moisture is contained therein to ensure noninflammability in the case where emulsion becomes mist due to the influence of environment, to be used in explosion-proof environment. In order to obtain emulsion, it is necessary to add suitable emulsion such as salt of fatty acid or the like. Though the emulsion form is mainly O/W, W/O may produce the same lubricating and cooling effects.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for lubrication of a pressure receiving portion of a high-speed rotating body (2), more specifically to a method for lubrication of a high peripheral speed rolling bearing, gear tooth surface, etc. (3).

Conventionally, lubrication of bearings of high-speed rotating bodies such as gas turbine shafts, where the In value reaches approximately t00 (λ000 (m-rpm) or higher), is mainly carried out using spray lubrication (oil mist lubrication).
The jet lubrication method is also used in some cases. 1. However, even if a spray lubrication method with an air-cooling effect is used, the temperature of such a high-speed rotating bearing cannot be avoided due to frictional heat generation or heat transfer from the outside.
The temperature may reach as high as 500°C, and even if special synthetic oil is used to lubricate such high-temperature bearings, it is still extremely difficult to maintain proper clearance during the temperature rising process.

In addition, in the case of high-speed rotary bearings used in equipment where there is a high temperature area around the area where oil mist may cause flammable explosions, the spray lubrication method using air as a medium cannot be used, so inert gas is used as the medium. A spray lubrication method must be adopted, which leads to problems in that the lubrication system becomes complicated and equipment and operating costs inevitably increase significantly.

On the other hand, the above-mentioned spray lubrication/lt method or jet lubrication method has been adopted for the lubrication of the tooth surfaces of gears that rotate at high speeds, but they have the same problems as bearings, and in the case of gears in particular, I7 and 1.
As a result, the viscosity of the oil decreases, leading to breakage of the commercial film and localized seizures.As a countermeasure, it was necessary to use extremely high viscosity oil, but high viscosity oil Preheating is essential in cases where it is difficult to create a mist, which creates a domino effect of complicating the equipment.

Therefore, the present inventors have discovered that it is possible to effectively cool and lubricate the pressure-receiving part of a high-speed rotating body by applying a relatively high-viscosity oil emulsion based on water, which has a low viscosity and a high specific heat, as a lubricant. The present invention has been arrived at as a result of various experiments and considerations.

An object of the present invention is to provide a method of lubricating a pressure receiving part of a high-speed rotating body that has explosion-proof performance and excellent cooling performance.

Another object of the present invention is to provide a high-speed rotating body capable of high-speed rotation in all seasons, which suffers from clearance imbalance during temperature rise transients from startup to steady state to +μ rotation, as in conventional lubrication methods. It is located in the cow that provides lubrication for the pressure receiving part.

Still another object of the present invention is to provide a method for sliding a pressure receiving portion of a high-speed rotating body, which uses a lubricant and a low-viscosity emulsion, so that the lubricating device is relatively simple and simple.

The present invention provides ``a method for lubricating a pressure-receiving portion of a descending high-speed rotating body, characterized by using a water-based emulsion containing relatively high viscosity /Ih as a lubricant.''

A detailed explanation of the present invention follows below.

A feature of the invention is the use of water-based emulsions as lubricants. Conventional examples of using water itself as a lubricant can be found in propeller bearings of ships, etc. According to this method, the heat generated in the bearing can be dissipated by water, and an excessive temperature rise on the shaft or supporting surface can be prevented. However, the water film has the disadvantage that it is much more difficult to destroy than the oil film produced by 441 lubrication. In order to prevent this drawback, a mechanism for supplying pressurized water to the bottom of the bearing as seen in Japanese Patent Publication No. 43-82821 has been proposed.

L, No. 17, The marine bearing described in this publication is a type of hydrostatic bearing in the industry, and not only does it require a pump to pump fluid, but it also requires a considerable amount of power. There were drawbacks.

! In these cases, the purpose is to lubricate the main shaft of medium to low speed rotation, which is different from the application of the present invention.

In this respect, the conventional θ) close gear oil bath lubrication method is similar; for example, at medium and low peripheral speeds of 15 m/SCC or more
There are no more than 11 people. Gear θ) Even in lubrication, spray moisture fr
Even if a 1-scale bearing was used, it had the same problems as the high-speed rotating bearings, such as insufficient cooling capacity and an explosion-proof environment.

Therefore, the present invention has been developed based on the knowledge of these prior art.
It was nothing but the result of all the hard work it took to score 74 points.

The constituent elements of the present invention will be described in more detail below.

The first oil is mineral/lt1. A mixture of two or more of synthetic, animal or vegetable oils is used.

Examples of mineral oils include light oil, A acid oil, spindle oil, turbine oil, dynamo oil, and V cylinder oil.

Internal combustion engine oil, machine oil, etc. are used.

Synthetic oil and 1. So, for example, dibasic acid dihair ster.

Phosphoric esters, silicate esters, neopentyl polyol esters, polyglycols, silicones, fluoroesters, poly(117) ethers, etc. are used.

Examples of animal oils include beef tallow, mode, (Liao/11).

Fish oil etc. are used.

Examples of vegetable oils include palm oil, rapeseed oil, sigma oil,
L-Soy sauce oil, cottonseed oil, etc. are used.

The conditions required for implementing the present invention for various pieces of music are at least 100° 1z (tf force i 7c).
St.

It has to be two sides. Q) Reason +-
+ viscosity is 7 cSI; if it is smaller than this, an oil film cannot be formed in the emulsion with sufficient strength Q) on the pressure-receiving surface of the high-speed rotating body.

In addition, molybdenum disulfide, tungsten disulfide, tungsten diselenide, and graphite are included in the oil supply.

Use a solid lubricant such as fluorinated graphite, PTFEC polymer) (-1 lubricant can also be used).

Mainly various types of additives, such as sulfides of animal and vegetable oils.

Sulfur compounds such as terpene sulfide and benzyl disulfide, phosphorus compounds such as tridalesyl phosphate and phosphite, sulfurized resin, metal soaps such as lead, zinc, and calcium chloride, and other sulfur and phosphorus compounds, etc. It can also be added into a song.

Emulsion If the above song is a water-paced emulsion, the water content is 3.
It is important that the content is 0% (volume %, the same shall apply hereinafter) or more.

The reason for this is that the emulsion is guaranteed to be non-flammable when it becomes a mist due to the environment, and it can be used in an explosion-proof environment.

That is, if the water content is less than 30%, the emulsion mist may ignite depending on the environmental conditions. In addition,
To obtain an emulsion, it is necessary to add a suitable emulsifier in addition to water.

Examples of emulsifiers include fatty acid salts, aionic emulsifiers such as Kr&alcohol sulfuric acid salts, alkylaryl sulfonates, cationic emulsifiers such as aliphatic amino salts, quaternary ammonium salts, alkylpyridinium salts, and carboxylic acid salts. , zwitterionic emulsifiers such as sulfate ester salts and sulfonate salts, nonions such as polyoxyethylene sorbitan alkyl esters, sorbitan alkyl esters, polyoxyethylene alkyl esters, polyoxyethylene alkylphenol ethers, and polyoxyethylene alkyl ethers. emulsifiers are used.

Also, although the emulsion form is mainly 0/9V, there is no difference in the lubrication and cooling effects even with Biki.

Nao, prevention of emulsion alteration due to bacterial growth 1F
Therefore, amine-based and other fungicides may be used.

The following effects can be obtained by cities implementing the present invention.

(1) Since the cooling capacity is low, the temperature of the rotating body pressure receiving part can be kept low. Therefore, there is no need to consider the transient clearance imbalance after startup until the steady state is reached. In general, warming up is omitted 7.
Suddenly, a small part that rotates quickly can be created.

(2) When lubricating bearings, gears, etc. around the temperature section, the mist is nonflammable, so it has explosion-proof properties and is safe.

(3) Since the emulsion itself has a low viscosity, it can also be used as a coolant, so it can be used as a cooling lubricant in applications where conventionally the lubricating system and cooling system were separated.
and share it (can be done).

(4) The lubrication equipment can be surface-grained. In other words, a circulation system including a pump with relatively low horsepower is sufficient.

(5) The present invention is a +% speed four-rotator +l 11280
0. (It can be used not only for lubrication of pressure receiving parts of medium and low speed rotating bodies, but also for lubrication of pressure receiving parts of medium and low speed rotating bodies.

Hereinafter, the present invention will be described in detail with reference to Examples.

FIG. 1 is a circulation system diagram of a high-speed rotating disk according to an embodiment of the present invention. This device consists of a disk 1 that rotates at high speed in a horizontal direction, and a rotating shaft 2 that extends vertically and is housed at the bottom of the center of the disk 1.
This rotation f\b27r Supporting rolling t) Bearings (angular → ball bearings in this case) 3 and 4, drive gears (helical gears) 5, 6, motor 7, l Lubricant tongue 8
θ) Lubricant supply to pump 9, piping 10, filter 11.1, each bearing and gear 〇12゜13.14, and oil sump I
) It is composed of 15 and 几. 7 [7] On the −L surface of disk 1, there is a flow of molten metal, salt or ceramic powder, etc., so there is a cooling passage inside to prevent overheating. 2N and 2B are provided. Note that the coolant and t7 share a lubricant, and the lubricant is connected to the pipe 16.
, is supplied to the 1 m path 2A via the seal 17, and is discharged to the oil sump 5 through the +jl path 2B.

The motor 7 is a three-phase AC induction motor (400Hz) with a maximum rated rotation speed of 240 (10r, pom).

輔2(i!rllIdiameter 4 I)r;rm) Since the speed increases slightly, it rotates at about 25 (100r, pl, m. Therefore, the dn value of the bearing is about LOOQQ (10mm,
r, pom, and the dn value of both cities is approximately 1.
．． 800. (1(10va, r, p, m +:
T7).

An emulsion serving as a lubricant was prepared in advance with the following composition and stored in the tank 8.

(1) Moisture 90% (
Vo1% or less) +21 /III min (viscosity 54c
St) ] (11% paraffin mineral song (marine song)
60-70%・Synthetic ester (polyol fat M-r=Ster) 15-25
%・Higher fatty acids (oleic acid, stearic acid?) 1-4%・
Nonionic emulsifier (holioquin ethylene alkyl) 5-7%, viscosity modifier (polybutene) 1-2%, anti-f'f
Agent (alkylamine) 2-3% ・Moldproofing agent (amine type) 0. As a result of implementing this example, all of the above-mentioned effects of the present invention were confirmed.

Despite being used intermittently for several months, there is no corrosion or rust on the rotating parts, the bearings and gears. '? '(
No generation of sura, Vy', etc. was observed in the circulation system of the agent. No separation of the detergent emulsion occurred either.

Note that the rolling bearing in the present invention includes deep groove ball bearings, self-aligning ball bearings, cylindrical roller bearings, tapered roller bearings, spherical roller bearings, thrust ball bearings, gold single-shaped roller bearings, etc. I can do it.

Further, the gear in the present invention includes a spur gear, a toothed gear, a spiral bevel gear, a heavoid gear, a worm gear,
It can be a screw gear, etc.

[Brief explanation of drawings]

FIG. 1 is an emulsion circulation system diagram according to an embodiment of the present invention. 1... Rotating disk, 2... Rotating shaft, 3.4... Rolling bearing, 5, 6...
・Gear, 7...Motor, 8...
...Dunk, 9...Pump, 10.
16...Piping.

Claims (4)

[Claims] (1) A method for moisturizing a pressure-receiving part of a high-speed rotating body, which is characterized by using a lubricant and a water-based emulsion containing relatively high-viscosity oil. (2) The lubrication method according to claim 1, wherein the oil is mineral oil, synthetic oil, animal or vegetable oil [7] or a mixture thereof. (3) The lubrication method according to claims 1 and 2, wherein the high-speed rotating body is a rolling bearing. (4) Claim 1 in which the high-speed rotating body is a gear
The lubrication method according to any one of item 1, item 2, and item 3, item C2.