Device for evaluation of the performance properties of motor oils

 

(57) Abstract:

The invention relates to a device for oxidation of oils in the evaluation of performance properties. Device for evaluation of the performance properties of engine oils includes a working chamber with electrical heating, sprinkler, refrigerator for volatile oxidation products with return condensation and temperature meter. The working chamber is made in the form of a cylindrical removable glass that is installed with the possibility of hermetic fixing, on top of which is placed a removable sleeve, the spray is made in the form of a hollow cone, the top of which has a hole and immersed in the test oil at the base of the spray against the removable sleeve nozzle holes for spraying oil while the sprinkler is placed inside the Cup coaxially him and mounted on a shaft mounted to turn in bearings under the sprinkler installed bubbler tube, is arranged to supply oxidant and sampling oil from a glass for analysis by means of the suction device, refrigerator for volatile oxidation products installed above the working chamber and is made in the form of a hollow cylinder with an input and o is the top directed to the inside of the refrigerator, and the top is sealed with a lid, which with the lower flange connected tightly. This device provides for the determination of the temperature range of operability of the engine oil, the rate of oxidation and corrosion activity depending on time and temperature tests. 3 Il.

The invention relates to a device for oxidation of oils in the evaluation of performance properties.

Known universal machine oxidation (GOST 18136 - 72, S. 2 - 4), including block heater aluminum, inside of which there are six slots pockets for placement of test vessels. The block is heated with electric heaters, maintaining temperature from 40 to 250oWith an accuracy of 0.5oC. the test Vessels made of heat-resistant glass and include a refrigerator, a pipe for supplying a gas, condensate trap, a sleeve with a cut, the transition tube, the suspension hook of the catalyst, the capillary and the tube.

The apparatus provides for the oxidation of the test oil with air or oxygen in the presence of a catalyst or without it, at a given temperature. The stability of the oil against oxidation is characterized by the following indicators: acid cisretinoic losses, bulk electrical resistivity, color and weight of the catalyst, appearance, color and weight of the condensate.

A disadvantage of the known technical solution is that the use of the device does not provide the possibility of determining the temperature of the operational capability of lubricating oils and their oxidation rate depending on the change of temperature test mode.

The closest in technical essence and the achieved result is a device for evaluation of the performance properties of motor oils, comprising a working chamber made in the form of a cylindrical tube with electrical heating, spray, made in the form prescribed angle to the working chamber of the tube with a nozzle for oil supply, team capacity, external bath with electric, refrigerator for volatile oxidation products, the return pipe of the condensate and contact thermometer (ed. St. USSR 179083, G 01 N 33/28, G 01 N 25/14, 1966).

A disadvantage of the known technical solution is that the use of air for atomizing the oil and the quality of the spray depends on its viscosity (or temperature), air flow, and getting into the working chamber decreases in temperature, as about to determine the temperature field of health oils it is almost not oxidized, the oxidation rate used to estimate the service life of oil, and corrosiveness.

The objective of the invention is to provide a device which provides the definition of the temperature range of operability of the engine oil, the rate of oxidation and corrosion activity depending on time and temperature tests.

The problem is solved in that the device for evaluation of the performance properties of motor oils, comprising a working chamber with electrical heating, sprinkler, refrigerator for volatile oxidation products with return condensation and temperature meter according to the invention, the working chamber is made in the form of a cylindrical removable glass that is installed with the possibility of hermetic fixing, on top of which is placed a removable sleeve, the spray is made in the form of a hollow cone, the top of which has a hole and immersed in the test oil at the base of the spray against the removable sleeve nozzle holes for spraying oil, while the sprinkler is placed inside the Cup coaxially him and mounted on a shaft mounted to turn in bearings under RA the oil from the Cup for analysis, by means of the suction device, a refrigerator for volatile oxidation products installed above the working chamber and is made in the form of a hollow cylinder with inlet and outlet fittings for refrigerant and flanges, the bottom of which is made with the formation of the conical surface, the apex directed to the inside of the refrigerator, and the top tightly closed lid, which with the lower flange connected tightly.

Comparative analysis of the prototype and the proposed device has shown that the latter has the following distinctive features.

The implementation of the working chamber in the form of a removable Cup with a built-in, removable sleeve, the supply of the spray device, which turns the oil into a fine dispersed phase, and a bubble tube for supplying oxidizer and a device for sampling the test oil, the installation of the refrigerator above the working chamber, providing a condensate drain in the glass, and the supply unit drainage oxidant - all these design features focused on problem solving - evaluate the performance properties of the engine oil by definition: the temperature range of operability of the engine oil, the rate of oxidation and corrosion activity in the ity indicator of oxidation of the oil temperature; in Fig.3 - dependence of the rate of oxidation from the time of oxidation.

The device contains three blocks, tightly interconnected. In the lower block has a working camera for the studied oils, made in the form of a cylindrical removable Cup 1 mounted coaxially in the housing 2 of the electric heater 3, isolated from the environment by insulation 4 and hermetically fixed gland device 5. On the top of the Cup 1 is fitted with removable sleeve 6, designed to study the tendency of oils lakonagaroobrazovaniyu and corrosiveness. Moreover, to study the paint and the carbonization sleeve 6 is made of aluminum, and to determine the corrosivity of oils and accelerate the oxidation process is made of steel, copper or its alloys.

The Cup 1 is taken out from the housing 2 of the electric heater by means of the handle 7 when the pressing device 5. Inside the Cup 1 coaxially installed the sprinkler 8, made in the form of a hollow cone with an opening 9 at the top, which is immersed in the test oil. At the base of the sprayer 8 holes 10 for spraying oil on the removable sleeve 6. Under the spray of 8, performing the role of agitator, for obseletes (air) and thermocouple 12.

Bubbler tube 11 is connected to the compressor 13 by the flow meter 14, the supply regulator 15 and oxidant device 16 sampling the studied oil during the test.

thermocouple 12 is connected with the block 17 temperature control, comprising: a temperature setter, schema compare, registration and display and connected to the heater 3. Unit 17 provides the discrete setting of required temperature and its automatic maintenance during the testing time of the investigated oils. The middle block of the device is made in the form of a hollow cylinder with 18 holes to enter the bubbler tube 11, a sealed input 19 of thermocouple 12 and tube 20 output air.

Top - fridge, is a hollow cylinder s inlet 22 and outlet 23 fittings for inlet and outlet of the refrigerant (water) and two flanges, the bottom of which 24 are made with a tapered surface 25, the top of which is directed into the cylinder 21. Such constructive execution of the lower flange 24 provides a condensation of vapors of oil and condensate drain into the working chamber 1. The cylindrical sleeve 26 is made integral with the flange 24, a bearing shaft 27 28 spray 8.

The upper flange 29 of the cylinder 21 germ is Oh 33, in which is mounted a bearing 34 of the shaft 28 of the spray device 8. Sleeve 26 and 33 are tightly connected and thereby eliminate the ingress of the refrigerant in the working chamber 1 and provide the normal operating temperature of the bearings 27 and 34.

The device operates as follows.

Due to the fact that the performance properties of lubricants measured by indicators such as: temperature field of health oils, oxidation rate, corrosivity, and the paint and carbonization, the operation of the device will consider taking into account the definitions of these indicators.

To determine the temperature range of operability of the test oil, the tests are carried out in the temperature range from 50 to 180oWith the interval 10-20oWith over two hours for each temperature. Before the test oil photometrate and determine the optical density.

The working chamber 1 is filled with the investigated oil in the amount of 100 g and by means of the handle 7 is installed in the housing 2 of the electric heater 3 and hermetically fixed gland device 5.

Included the supply of the refrigerant (water), which through the inlet fitting 22, the hollow cylinder 21 is supplied to the outlet fitting 23. At the same time wikipaedia desired temperature of the test oil, registered by thermocouple 12. Oil temperature during the test is automatically maintained and recorded analog indicator.

After reaching the set temperature off indicator light heater 3 (led) and the heater, switch on the compressor 13 and through the valve 15 is set to the flow of oxidant through the flow meter 14 and recorded the start time of the test. Simultaneously with the switching on of the compressor 13 is activated, the actuator 32 of rotation of the spray device 8, which during the rotation due to centrifugal force pumps oil from the oxidizer through the hole 9 and the conical surface to the holes 10 for turning it in fine condition.

The oxidant (air) from the compressor 13 through the supply regulator 15, the flow meter 14 enters the bubbler tube 11 and through its holes, immersed in the oil passes through the oil volume in the working chamber 1 and through the layer of fine-dispersed oil phase formed his spray holes 10 comes into contact with cold conical surface 25 of the flange 24 of the refrigerator 21. After condensation of the vapors of oils oxidant through the tube 20 enters the atmosphere, and the condensate flows down the conical surface 25 into the working chamber 1 for food the particular spray 8, with fine dispersed phase and in a thin layer of oil, stecaomega on the surface of the removable sleeve 6, provides increased time of contact of the oxidant with the oil, which increases the rate of its oxidation, and hence the testing time.

After two hours of testing, turn off the compressor 13, closes the valve 15 and through the device 16 (syringe) to select the oil sample and is determined by its optical density. Then set the new temperature value (greater than the previous 10-20oC) switch on the compressor 13, sets the flow rate of the oxidizer and after reaching the set temperature is fixed by the time of the beginning of the test oil at the new temperature conditions.

Testing is carried out until, until at some temperature not there will be a sharp change in optical density of the oil. This temperature is the maximum temperature operability of the studied oils. The results of the tests are built according to changes in the optical density of the oil from the test temperature (Fig.2).

According to these dependencies (Fig.2) temperature in the region of oil performance M-8(and) is limited to a temperature of 150oAnd oil 10 W 30 - 160oC.

the radiated oil, washed the glass is filled with wash liquid and is installed in the chassis 2 heater 3. Then turn on the sprinkler 8 for washing and washed bubbler tube 11 and the device 16 oil sampling.

The operation of the device when determining the rate of oxidation of the oil is similar to that described above with the only difference that the oxidation is carried out at a constant temperature by 5-10oWith higher temperature of the beginning of oxidation, determined by the dependencies of Fig. 2, or at the temperature specified in the technical conditions for the test oil.

After reaching the set temperature switch on the compressor 13, is set to the specified flow rate of oxidizer valve 15 by the flow meter 14 includes the sprayer 8 and is fixed by the time of the beginning of oxidation. Every two hours is selected, the oil sample device 16 for photometric measurements and determine the extent of oxidation. On the obtained values of optical density build dependency (Fig. 3) from the time of oxidation, the angle of which determines the rate of oxidation. The lower the oxidation rate of the oil, the higher its thermal-oxidative stability.

According to the provided data (Fig.3) the lowest oxidation rate has the and, oil M-8-In - 5,6 hours, and the oil 10 W 30 - 16.4 hours, therefore, the greatest resource work has oil 10 W 30.

The apparatus for determining the tendency of the oil to the paint and carbon deposition are similar to those described with the only difference that the oil have in the temperature range from 180 to 350oC. the initial temperature is set to 180oWith and increase its speed value by 10-20oWith, and the testing time is increased to 4 h

Before testing the removable sleeve 6 made of aluminum or its alloys, weighed with an accuracy of 0.002, After every 4 hours of the test glass 1 is taken out from the housing 2 heater 3 is removed with the sleeve 6, degreased, dried, weighed and the amount of deposits depending on the test temperature.

For determining the corrosion activity of the investigated oils removable sleeve 6 use of steel, copper or its alloys and the difference between its weight before and after the test to determine corrosivity. These removable bushings are used as catalysts to increase the rate of oxidation of the oil.

The use of the device allows for testing both clean and working oils, as a catalyst, and without it, sposobnosti, the rate of oxidation, corrosion activity and the propensity for the paint and carbon deposition, which allows for the selection of the best samples of oils and evaluate change their performance characteristics when used in internal combustion engines.

Device for evaluation of the performance properties of motor oils, comprising a working chamber with electrical heating, sprinkler, refrigerator for volatile oxidation products with return condensation and temperature meter, characterized in that the working chamber is in the form of a cylindrical removable glass that is installed with the possibility of hermetic fixing, on top of which is placed a removable sleeve, the spray is made in the form of a hollow cone, the top of which has a hole and immersed in the test oil at the base of the spray against the removable sleeve nozzle holes for spraying oil while the sprinkler is placed inside the Cup coaxially him and mounted on the shaft, prescribed in turn in bearings under the sprinkler installed barbacana tube, is arranged to supply oxidant and sampling oil from a glass for analysis by means of the suction device, Kholodilin and outlet fittings for refrigerant and flanges, the bottom of which is made with the formation of the conical surface, the apex directed into the interior of the refrigerator, and the top is sealed with a lid, which with the lower flange connected tightly.

 

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