Low temperature control method and device for oil temperature and environment temperature under oil injection lubrication

Abstract

The invention discloses a low temperature control method and device for the oil temperature and the environment temperature under oil injection lubrication. The device comprises a shell, a refrigerating system, an electrical system, an oil storage tank, an alcohol tank, an air circulation cooling tank and the like. An oil temperature control method comprises the steps that firstly, the temperature in the alcohol tank is lowered, and lubricating oil in an oil inlet pipe is cooled through low-temperature alcohol in the alcohol tank; meanwhile, a temperature measuring resistor at an oil injection nozzle feeds back the oil temperature to a PID controller, and the electrifying time of an electric heating stick in the alcohol tank is determined through PID operation. An environment temperature control method comprises the steps that firstly, the temperature of air in the air cooling tank is lowered, the cooled air is then conveyed to a lubricated part contact area; meanwhile, a temperature testing resistor in the lubricated part contact area feeds the temperature of the air to the PIC controller, and the rotating speed of a circulating fan is controlled through PID operation. By means of the structure, an oil temperature control system and an environment temperature control system are integrated, and the method through which the oil temperature and the environment temperature under the low temperature can be accurately controlled at the same time is achieved.

Description

technical field [0001] The invention relates to the technical field of low temperature control of lubricating oil, in particular to a low temperature control method and device for oil temperature and ambient temperature under oil injection lubrication. Background technique [0002] In order to study the lubricating performance of aerospace bearings at low temperatures, it is necessary to accurately simulate the low temperature environment where the aerospace bearings are located, that is, the lubricating oil to be tested needs to be cooled, and the ambient temperature of the lubricated specimen must also be kept within the Low temperature state, in order to complete the test of friction and lubrication characteristics of lubricating oil in low temperature environment. [0003] At present, the commonly used lubricating oil friction test machine adopts the oil bath lubrication method, immersing the ball in the lubricating oil to be tested, and bringing the lubricating oil into...

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Problems solved by technology

The disadvantage of this low temperature control method is: oil bath lubrication is suitable for the case where the running speed of the lubricated test pieces is low, that is, the speed of the two lubricated test pieces at the contact point is 12m / s, for the two lubricated test pieces When the speed at the contact point is higher than 12m / s, how to realize the test of the friction and lubrication characteristics of lubricating oil at low temperature has not been seen in the relevant literature

The disadvantage of this method is that the oil mist is a mixture of air and lubricating oil, and the specific heat capacity of the air is much smaller than that of the lubricating oil, so the measured temperature at the nozzle is the temperature of the oil mist, which cannot truly reflect the actual temperature of the lubricating oil. temperature

Moreover, this method has a low rate of collection and secondary utilization of lubricating oil, and the leaked oil mist will cause harm to experimenters.

[0005] For the control of the ambient temperature of the lubricated parts, liquid nitrogen cooling is commonly used, but there are defects in the flow control of low-temperature nitrogen, and the production of low-temperature nitrogen is only controlled by the amount of heat generated by the electric heating core in the Dewar bottle , due to the existence of hysteresis, it is easy to overcool, and another set of high-power heating rods is needed to offset the excessive cooling effect caused by too much low-temperature gas. Its structure is also relatively complicated, and it occupies a relatively large volume

[0006] The currently disclosed oil bath lubrication and oil spray (oil mist) lubrication cannot satisfy the precise control of the oil temperature in the test of low temperature friction and lubrication characteristics of lubricating oil at high speed, especially when the contact point speed of the two lubricated specimens is higher than 12m / s , and there is no relevant literature on the precise control of oil temperature and ambient temperature at low temperature at the same time

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