Browsing by Author "Vorobyov, Mykola"

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    Elements of the theory of closed-loop mechanisms formed by rolling bodies without kinematic sliding
    (Видавництво Львівської політехніки, 2019-03-20) Vorobyov, Mykola; Prokopenko, Denis; Ivano-Frankivsk National University of Oil and Gas
    In the modern industry, it is impossible to do without high-tech equipment, for the designing of which the practical experience and experience of scientists are used. The main principles of engineering mechanics are based on the improvement of technical processes that promote creating certain conditions for the development of the manufacturing industry. An innovative approach to solving the problems of designing and creating any equipment makes it possible to combine new technologies and scientific and technical studies. When designing process equipment, there is a need not only to improve the existing types but also to search for new principles for connecting the supporting elements. It is important to create the right conditions for the effective functioning of reliable mechanisms. The main elements of the process equipment are the supporting ones. Among them, the bearings are the most important elements. Their reliable and long-term operation depends on the structural features of the supports. When designing the bearing units, they take into account the purpose of the mechanism, its operating conditions, the magnitude and direction of the loadings applied to the bearings, the required resource, the rotation frequency, the temperature and the state of the environment. In real bearings, there are no two fixed guides, and the separation is ensured by an intermediate element, which is connected by sliding friction. Besides, modern oil and gas equipment also usesradial supports through which a working fluid circulates with impurities of abrasive particles, which quickly destroys this element. Therefore, there is a need to create a scientific basis for the design of fundamentally new modern bearings. The purpose of the work is to find the optimum range of existence of closed-loop mechanisms formed by rolling bodies without kinematic sliding and to obtain the analytical dependences that relate the geometric parameters of the bearings to the separation by the rolling bodies in the absence of sliding. In this case, all three drive types are considered: from the outer or inner clip or the two clips together. To ensure the workability of all types of radial bearings, a range of specific basic conditions should be met. Given the significant advantages of these types of mechanisms, the challenge arises for their further study, with a view to wide implementation and practical application. The results can be useful for designing support elements for equipment used in many manufacturing fields.
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    Hydraulic pump based on the rolamite mechanism
    (Lviv Politechnic Publishing House, 2018-01-29) Vorobyov, Mykola; Prokopenko, Denis; Ivano-Frankivsk National University of Oil and Gas
    When designing pumping equipment the question arises not only of the improvement of the existing types but also the search for a new principle of uniting the supporting elements with the elements of the formation of the working cameras of the pump. The purpose of the work is to provide a substantiation of the possibilities and expediency of designing a de-axial pump based on the Rolomite mechanism. Conditions ensuring the efficiency of the mechanism are considered on the basis of a specific hydraulic pump; the principle of inlet and outlet windows placement is justified. Analytical calculation of camera areas with the help of the created model in SolidWorks is provided and the coefficient of liquid compression is determined. The graphs of changing the areas of large and small cameras are presented. The use of an electromagnet as a drive makes it possible to transfer the rotation into a closed space, which makes it possible to abandon bearings, seals, and also significantly simplifies the technological process of pump elements manufacturing. The flexible tape allows reducing the slip friction and getting a separate camera, which makes it possible to pump two substances at a time. There is also a process of liquid magnetization in the pump, which reduces the corrosion of metal elements of the pump and the pipelines. Considering the benefits of these types of mechanisms, there is the prospect of their further research and implementation.