SU773491A1 - Method of determining evaporation losses of lubricating oils - Google Patents

Description

The goal is achieved by the fact that in the method of determining the loss of lubricating oil from evaporation by introducing a non-evaporating substance into the oil, followed by determining the change in its concentration in the working oil, as a non-evaporating substance, polymethyldichlorosiloxane liquid will be injected in the amount of 0.051% by weight oil.

The mixture of oil and liquid is poured into the machine or mechanism. When the machine operates or the mechanism, oil samples are periodically taken. In the oil samples, the content of polymethyldichlorosiloxane fluid is determined, for example, by the intensity of the characteristic bands of the infrared spectrum of the liquid.

The total oil consumption for evaporation and leakage is measured by the weight method. The amount of evaporated oil is determined from the ratio

C.Vi-Ci.Vi

  H

)

where Q UM

- the amount of evaporated

during the operation of the oil; total oil consumption in the machine or mechanism during the test;

C, C is the concentration of injected fluid in the fresh and worked oil;

v; Vj, the amount of oil before the test, and after the test.

Example 1, The determination of losses due to evaporation of SZp-6 oil is carried out on an IKS-40 unit (GOST 0457-75).

Test conditions: Engine speed, rev / min 1500

Fuel consumption, kg / g0,67

Cylinder temperature, ° C 190 Oil temperature, ° C 120 Oil quantity taken up for testing, g 800 Duration of testing, h 25

The concentration of the injected polymethyldichlorosiloxane liquid in the oil before and after the test is determined by the X-ray method on an IK-20 device.

The test results for five different concentrations of polymethyldichlorosiloxane liquid in fresh oil are given in Table. one.

Table 1

The results of the experiments show that when the concentration of the injected liquid is below 0.05 wt.%, The accuracy of determining the concentration of the liquid in the oil decreases, and when the concentration is higher than 1.0 wt.%, The solubility of the substance worsens, which explains the variation in the results of parallel wholesale of three indicated concentrations. .

Example 2. Under the test conditions of Example 1, the losses from evaporation of oils of different composition were determined. The test duration is 25 hours, the concentration of the injected liquid is 0.25% by weight.

The test results are shown in Table. 2

Table

.one

Lubricating

The amount of evaporated oil, g oil

380 10

160

91

As can be seen from the table. 2, evaporation losses are greater for oils, whose base is easily evaporating fractions, which is consistent with operating data.

Example 3. The determination of losses from evaporation of oil is carried out.

DV-ASZp-10 on the installation Pitter-W proposed method and known.

Test conditions: Engine power, l, s, - 5 l / s Engine speed, rev / min 1500 r / min Table data. 3 testifies to the high accuracy of the proposed method in comparison with the known. The results of parallel experiments to determine the loss of oil from evaporation by the proposed method at a cylinder temperature of 150 ° C were 17, 18, 19%, while using a known method gives a large scatter of results that does not allow a true estimate of the loss. lubricating oil from evaporation. Using the proposed method, compared with the well-known method, it provides high accuracy in determining the loss of oil from evaporation in operating machines and mechanisms, reducing the time spent on testing (from 36 hours to 25 hours per test). The proposed method makes it possible to obtain the absolute value of the loss of oil from evaporation in operating mechanisms, which will allow for more accurate selection of lubricating oils for. various types of machines

Cylinder temperature, "С 100 150 ° С

Oil temperature in crankcase, ° С

IIQOC

The amount of oil taken for

test, 800 g

The test results are given

tab. 3

Claims (1)

Table kanizm and thereby reduce oil consumption, improve the quality of lubricating oils. Claims The method of determining the loss of lubricating oil from evaporation by introducing a non-evaporating substance into the oil, followed by determining the change in its concentration in the working oil, is characterized in that -1% by weight of oil. Sources of information taken into account in examination 1, Place C, F, Gree I.e. Perichemauce Cubicauts for Automotive Engines and Transmissions, London, 1974, p. 308 (prototype).