快乐出发（Happy departure）.docVIP

快乐出发（Happy departure） Hydraulic and pneumatic transmission simulation questions 1 answer First, fill in the blanks (1 points per day, a total of 20 points) 1. hydraulic transmission is fluid transmission medium, the use of liquid pressure to convey the movement and power. 2. hydraulic transmission device consists of power components, executive components, control components and auxiliary components of four parts. 3., the flow state of liquid can be divided into laminar and turbulent flow, and can be determined by Reynolds number. 4. the pressure of the hydraulic system depends on the external load. 5. commonly used hydraulic pumps are divided into gear pumps, vane pumps and piston pumps in three categories. 6. the energy loss of fluid flowing through the pipeline can be divided into the pressure loss along the way and the partial pressure loss. 8., in order to eliminate the gear pump oil trapped phenomenon, usually in both sides of the cover plate on the unloading groove, so that the dead volume by large change and oil pressure When the cavity is closed, the dead volume is changed from small to large and communicated with the oil suction cavity. 9. relief valve is stable inlet pressure, pressure relief valve is the stability of the export pressure. Two, they can say the following name symbols represent elements (match each 2 points, a total of 10 points) Pilot relief valve; pilot pressure reducing valve; external control leakage sequence valve; three position four way solenoid valve (median function is M); one-way quantitative pump. Three questions (10 points per day, a total of 20 points) 1. gear pump leakage what are the ways? Which one is the main player? End face leakage, radial leakage; meshing leakage; (2 points each) Among them, the end surface leakage mainly. (4 points) 2.. The rated pressure and rated flow of the hydraulic pump are known. If the loss of pipe and component is ignored, the hydraulic pump outlet under different working conditions shall be show