Bypass and bi-stable type on-way resistance experiment instrument and method thereof

Abstract

The invention discloses a bypass and bi-stable type on-way resistance experiment instrument and a method thereof. The instrument comprises a water storage tank, a high-lift water pump, a water supply pipe, a manual or electric valve, a thin current-limiting bypass throttle pipe, a pressure-stabilizing tank, an experiment pipeline, a flow regulating valve, a funnel, a water return pipe, a measuring instrument and the like. The on-way resistance experiment instrument is required to have dual functions of a laminar flow experiment and a turbulent flow experiment. When all the valves are closed, pressurized water, pumped from the water pump, in front of the valves flows to the experiment pipeline via the bypass pipe, and the bypass pipe can well eliminate fluctuation, caused by the water pump, of pressure of water in front of the valves and play good roles in wave absorbing and pressure stabilizing. The pressure-stabilizing tank performs secondary pressure stabilization, the pressure stabilizing accuracy is within plus / minus 0.5 mm, and the pressure-stabilized water supply requirement for the laminar flow experiment can be met under the condition of direct supply by the water pump. The problem of stabilization of the laminar flow experiment under the condition of direct supply by the water pump is solved. Meanwhile, at the turbulent flow stage, the pressure-stabilizing tank stabilizes the pressure, and the good turbulent flow pressure stabilization effect is realized. The experiment instrument is stable in pressure, high in measuring accuracy, simple in structure and convenient to operate.

Description

technical field [0001] The invention relates to a teaching experiment instrument. In particular, it relates to a bypass type bistable along-path resistance tester and a method thereof. Background technique [0002] In the teaching experiment of fluid mechanics and hydraulics, the along-path resistance experiment is a basic experiment item widely used in colleges and universities. The resistance tester used in it is usually directly supplied by a water pump, which is a self-circulating water supply tester. Due to the pressure fluctuation in the self-circulating pipeline system caused by the water pump, this kind of experimental instrument will seriously affect the accuracy and stability of the experiment. The following is an example of the traditional 7mm experimental pipeline resistance tester along the way to illustrate its technical background. [0003] The resistance test along the course includes laminar flow experiment and turbulent flow experiment. The turbulent ...

AI Technical Summary

Problems solved by technology

This voltage stabilization method has the following two problems: one is that the surge tank must be large and the pressure resistance must be high, the production of the tank body is difficult, and the manufacturing cost is high; Such as the surge tank (5) in the accompanying drawing, the diameter of this surge tank is more than 20 cm, and there is no such tank on the market

Currently, small pressure tanks are used and a diverter device is added, but the pressure stabilization effect is generally poor, and there will still be pressure fluctuations above 4-6 mm water column in the laminar flow state

Experimental instruments with pressure fluctuations greater than 2 mm water column cannot meet the requirements of teaching experiments

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