SYNTHESIS OF A LEVER-CAM MOTION TRANSDUCER FOR A ROTARY VANE PUMP

The article solves problem of synthesizing a lever-cam motion transducer that converts rotary motion of input shaft of a rotary pump into motion of its vanes required for volumetric pumping of gases and liquids. Analytical expressions for theoretical profile of cam of lever-cam transducer of the movement of rotary vane pump are obtained. The cam profile was built according to analytical expressions.

Investigation of the Internal Displacement Chamber Pressure of a Rotary Vane Pump

Low noise emissions of vehicle components are today a quality feature in the automotive sector. In automatic transmissions in particular, the hydraulic pump often contributes significantly to noise, which motivates research to clarify the noise sources and transmission pathways in these components. The subject of the present investigation is the generation of noise by the inherently instationary flow in hydraulic pumps. In order to shed some light on these phenomena, a computational fluid dynamics (CFD) simulation model for flow investigations on rotary vane pumps was set up. In this work, first the influence of different simulation parameters on the numerical results is analyzed. Then the pressure in the internal displacement chambers of the pump is examined, as it can be assumed that this is the essential parameter for noise generation. Different operating conditions such as rotational speeds and delivery pressures are investigated. Furthermore, the simulation results are compared to pressure measurements for validation and are used to find optimization potentials.

Design on Ultrahigh Vacuum System with Titanium Pump

In order to meet the further requirements that study diamond-like carbon (DLC) films as rigid protective coating, a three-stage ultrahigh vacuum system composed of rotary vane pump and diffusion pump in parallel with TSP ( titanium sublimation pump) was designed mainly for getting limiting vacuum of 1.0×10-6Pa within 30 minutes in the vacuum chamber of about 0.23m3. The chamber is a horizontal cylinder supported by a saddle-shaped bracket and it has been proved to satisfy the requirements of strength and stiffness, it can be easy to get ultrahigh vacuum by TSP. Initiation pressure of the TSP was set to 10-3Pa vacuum after optimization analysis and the diffusion pump simultaneously was closed for the proper use. The system can be used as deposition equipment with the assistance of high and low vacuum measuring instruments and other accessories.

Design on UHV System with TSP

A UHV(ultra-high vacuum) system, which used as deposition equipment with the assistance of high and low vacuum measuring instruments and other accessories, was designed in this paper. A CMP (composite molecular pump) in parallel with TSP (titanium sublimation pump) as the main pump and a rotary-vane pump as the backing pump were designed in this system. After a CMP with displacement 2300l/s was chosen as the one of the main pumps, the total flow conductance between the outlet of vacuum chamber and the CMP was 1344l/s. The rough pump-down time was approximate 5 min by using a rotary-vane pump with pumping speeds 15l/s. In order to ensure the normal operation of the main pumps, a water chilling unit was designed in the system, which can achieve limiting vacuum of 5×10-6Pa in the vacuum chamber of 0.2 m3.

Design on High Vacuum System with Molecular Pump

This paper aimed at finishing a two-stage oil-free high-vacuum system using a molecular pump as the main pump and a rotary vane pump as the backing pump. Before the pump’s inlet, there is a molecular sieve. With the assistance of the high and low vacuum measuring instruments and other accessories, the system can achieve limiting vacuum of 5×10-5Pa in the vacuum chamber whose volume is 0.085m3 and provide the high vacuum needed for vacuum coating equipments whose magnitude is 100mm.