Gear pump

About: Gear pump is a research topic. Over the lifetime, 7490 publications have been published within this topic receiving 38837 citations. The topic is also known as: Gear pump.

Feeder for apparatus for ejecting a mixture of a plurality of liquids, with heated hoses

Abstract: A feeder for apparatus for ejecting a mixture of liquids, e.g. urethane foam, comprises a pair of swash plate proportioning pumps one individual to each of the liquids, e.g. resin and isocyanate, each proportioning pump being fed by a gear pump from a supply of the respective liquid. Seepage along the drive shafts of the isocyanate pumps is continuously removed by bathing them in a recirculating stream of flushing agent. The swash plate and gear pumps and flushing agent pump are all driven by a single motor from a common chain drive. The liquids are heated during passage through separate hoses to a common dispensing head or gun, by immersed coil electric resistance heaters extending lengthwise freely within the hoses. A novel control system is provided for the hose heater circuit, the adequacy of the liquid supply and other operating conditions.

Paint spray machine having wet film thickness measurement and feedback control

Abstract: An improved paint spraying device for applying coats of paint to an object in which the machine has a paint spray gun, a gear pump gun that pumps paint to the spray gun from a vessel containing paint, a variable speed electric motor that drives the gear pump, a pump motor controller that controls the electric motor of the gear pump, means for moving the spray gun vertically and horizontally and for controlling the speed and acceleration of the movement of the gun, means for controlling the number of passes made by the gun, the dwell period at the end of each pass and the flash time between coats of paint applied by the gun; wherein the improvement is as follows: a. a wet film measuring device which makes a measurement of paint film thickness of the paint applied to the surface of the object without contacting the object at a multiplicity of predetermined points over the entire painted surface of the object and generates an electrical signal for each film thickness measurement that is proportional to the film thickness and correlates the measurement to point at which the measurement was made; b. a computer which receives the signal from the measuring device and calculates increase or decrease in amount of paint to be applied to the next object being sprayed at each point the film thickness was measured and converts to a signal that is fed to the pump motor controller that controls paint being fed to the spray gun.

Hydraulic performance of a large slanted axial‐flow pump

Abstract: Purpose – The pump of the Taipuhe Pump Station, larger flow discharge, lower head, is one of the largest 15° slanted axial‐flow pumps in the world. However, few studies have been done for the larger slanted axial‐flow pump on safe operation. The purpose of this paper is to analyze the impeller elevation, unsteady flow, hydraulic thrust and the zero‐head flow characteristics of the pump.Design/methodology/approach – The flow field in and through the pump was analyzed numerically during the initial stages of the pump design process, then the entire flow passage through the pump was analyzed to calculate the hydraulic thrust to prevent damage to the bearings and improve the operating stability. The zero‐head pump flow characteristics were analyzed to ensure that the pump will work reliably at much lower heads.Findings – The calculated results are in good agreement with experimental data for the pump elevation effects, the performance curve, pressure oscillations, hydraulic thrust and zero‐head performance.Re...

Hot melt machine

Abstract: A hot melt machine comprises a hopper for granular thermoplastic resin having a bottom outlet across which an electrically heated melting grid extends. A funnel beneath the grid collects molten resin and guides it to fall into a small, open-topped heated reservoir spaced below it. A gear pump, driven by a constant torque motor and having its inlet communicated with a bottom outlet in the reservoir, forces the melt towards points of use. A sensor in the reservoir controls grid energization in accordance with reservoir liquid level. A heat shield between funnel and reservoir, having a hole through which melt falls, prevents reservoir heat from affecting grid operation.

A hybrid propulsion system for a motor vehicle with a double-drum gear control device

Abstract: The hybrid propulsion system (10) comprises a combustion engine (12), a gearbox (16), and an electric machine (20) kinematically connected to the gearbox (16) by means of a first drive transmission mechanism (22) comprising a pinion (74) carried by an output shaft (72) of the electric machine (20), one (44) of the gears of the gearbox (16) and an intermediate gear (76). The gearbox (16) comprises a gear control device (80, 82) and first and second shafts (28, 30) on which are mounted a plurality of idle gears (46, 48, 50, 52, 60, 62, 64) and a plurality of slidable engagement sleeves (54, 56, 68, 70) each of which is associated with one or two idle gears to connect them for rotation with the respective first or second shaft (28, 30). The gear control device (80, 82) comprises a first drum control device (80) associated with the first shaft (28) to control the movement of the slidable engagement sleeves (54, 56) disposed on that shaft, a second drum control device (82) associated with the second shaft (30) to control the movement of the slidable engagement sleeves (68, 70) disposed on that shaft, and an actuation unit (116, 122) which is arranged to bring about rotation of the first and second drum control devices (80, 82) in a synchronized manner. The actuation unit (116, 122) comprises a motor device (116) and a second drive transmission mechanism (122) in turn comprising a first gear (124) associated with the first drum control device (80), a second gear (126) associated with the second drum control device (82), and an intermediate gear (128), the first or second gear (124, 126) meshing with an output pinion (120) of the motor device (116) and the intermediate gear (128) meshing both with the first gear (124) and with the second gear (126). The intermediate gear (128) of the second drive transmission mechanism (122) is coaxial with the intermediate gear (76) of the first drive transmission mechanism (22).