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- Autors
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Pimonov I. G., Penkina N. P., Yaryzhko O. V., Moschenok V. I., Saliy Y. L.
- Issue
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Hoisting and transport equipment, 2025, №2(70)
- Pages
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57-69
- DOI
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10.15276/pidtt.2.70.2025.06
- Abstract
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The article deals with the topical issue of increasing the productivity of machines and ensuring their reliability. A promising direction is to increase the efficiency of machines by developing a system of thermal control of the working fluid. The design of modern hydraulic actuators requires innovations in designs and locations on the machine. It is necessary to take into account the existing experience of designing and operating similarly designed hydrofied machines. The thermal regime of the hydraulic actuator affects power losses, the durability of its components and the ability of the working fluid to maintain the required parameters. From the temperature (viscosity) corresponding to the pumpability limit, which determines the possibility of winter start-up of the hydraulic actuator, the heating of the working fluid passes through the stage of possible cavitation phenomena and reaches values that allow for long-term operation. Many works have been devoted to the study and optimisation of the thermal regime of hydraulic actuators, but they have not been developed to establish a rational regime for the temperature preparation of the working fluid at the initial stage: from the temperature that corresponds to the pumping limit to the temperature that allows for long-term operation. Therefore, the article establishes dependencies that relate the heating time of the working fluid to the main parameters of the hydraulic actuator, provided that a constant pressure is maintained at the pump inlet throughout the heating period. An analytical dependence relating the time of heating the working fluid to the required temperature interval to the main parameters of the hydraulic drive, provided that a constant pressure at the pump inlet is maintained throughout the heating process. Heating of the working fluid with a constant permissible pressure at the pump inlet, which is achieved by increasing the flow rate as the working fluid warms up, makes it possible to reduce the time of temperature preparation of the hydraulic actuator for operation by 40...60 % and, accordingly, reduce the energy consumption of this process. The degree of influence of the main parameters of the hydraulic actuator on its warm-up time at a constant flow rate decreases in the following sequence: overall efficiency, pressure, mass of working fluid and hydraulic equipment, heat transfer coefficients and heat transfer area.
- Keywords
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hydraulic drive, time of temperature preparation of the hydraulic drive, ensuring constant pressure at the pump inlet.
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