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Method for determining high-temperature evaporation loss of lubricating oil

A high-temperature evaporation and evaporation loss technology, applied in the field of measurement, can solve the problems of easy overheating of the aluminum bath temperature, high evaporation loss test results, and difficult control of the air outlet temperature, and achieve the effect of meeting the design requirements

Inactive Publication Date: 2012-07-11
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] ①The temperature of the aluminum bath is easy to overheat
[0006] ②The air outlet temperature is not easy to control
Therefore, the inconsistency between the aluminum bath temperature and the air outlet temperature, the oil sample temperature is higher than the test temperature, resulting in high evaporation loss test results

Method used

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  • Method for determining high-temperature evaporation loss of lubricating oil
  • Method for determining high-temperature evaporation loss of lubricating oil
  • Method for determining high-temperature evaporation loss of lubricating oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Determination of the evaporation loss of m-terphenyl at 205°C.

[0028] See attached Figure 1~2 As shown, the method for measuring the high-temperature evaporation loss of lubricating oil, the steps of the method are:

[0029] (1) Install the cover 4 with the exhaust pipe 3 on the aluminum block heater 5, set the aluminum block heater 5 to the test temperature and then heat it. The test temperature is 205°C, and the temperature control accuracy is ±1°C. 7 Observe that after the temperature reaches the test temperature, the air flow is introduced through the flow meter 6, and the air flow is controlled within the range of 2L / min±15.5mL / min, and the aluminum block heater 5 adopts a pressure-regulating heating and temperature control method;

[0030] (2) After the cover 4 of the exhaust pipe 3 is preheated and kept warm for 0.5h, take it out from the aluminum block heater 5, add 10±0.05g of oil sample to the sample cup 1 and install it on the exhaust pipe 3 to...

Embodiment 2

[0045] Example 2: Determination of the evaporation loss of 4050 aviation lubricating oil at 205°C

[0046] Its test process is identical with embodiment 1, and the calculation result of evaporation loss is:

[0047] X=(S-W) / S×100%=(10.0-9.395)×100%=6.05%

Embodiment 3

[0048] Example 3: Determination of evaporation loss of RC-5 fluorosilicone oil at 250°C

[0049] Its test process is identical with embodiment 1, and wherein, test temperature is 250 ℃, and the calculated result of evaporation loss is:

[0050] X=(S-W) / S×100%=(10.0-9.496)×100%=5.04%

[0051] Compared with the prior art, the method of the present invention is simple and easy to operate, and is not easily affected by heating time and different operators due to the automatic control of the instrument during the test process, so that the repeatability of the test results is good. After many tests, the repeatability error is in the range of 0.24% to 8.73%, which is lower than the regulation of SH / T 0661 method of less than 10%.

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Abstract

The invention relates to a method for determining the high-temperature evaporation loss of lubricating oil. According to the method, an aluminum block heater in accordance with an SH / T 0661 method is adopted, and a ring-shaped heater of an air preheater is closed to determine the evaporation loss of the lubricating oil by adopting a pressure regulation type heating temperature control mode, wherein a sample cup and a cover of an evaporator assembly accord with provisions of a GB / T 7325 method, and an exhaust pipe and a cover of the evaporator assembly accord with provisions of the SH / T 0661 method. The method is characterized by comprising the following determination steps of: thoroughly cleaning all components of the evaporator assembly; setting a test temperature and an air flow rate; keeping the temperature of the aluminum block heater and the air flow rate for at least 0.5 hour; weighing 10+ / -0.05g of a sample; testing for 6.5+ / -0.1 hours; and calculating the evaporation loss X of the lubricating oil. According to the method, the evaporation loss of the lubricating oil at 150 to 250 DEG C can be accurately determined, and design requirements for a novel aircraft engine can be met.

Description

technical field [0001] The invention relates to a method for measuring high-temperature evaporation loss of lubricating oil, which belongs to the field of measurement technology. Background of the invention [0002] As the temperature before the turbine of the aero-engine increases, the temperature of the engine lubrication system also increases, so the requirements for the use temperature of aviation lubricating oil are getting higher and higher. At present, the maximum service temperature of aviation lubricants used in aircraft engines in my country reaches 200°C. The design department proposes a maximum service temperature requirement of 250°C for aviation lubricants for new types of aero-engines. Usually, the evaporation loss that characterizes the performance of aviation lubricating oil needs to be measured at the highest service temperature as the performance index and design parameter of aviation lubricating oil. Therefore, the test temperature with evaporation loss ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
Inventor 姜克娟张旭王彦
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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