碩士 / 國立屏東科技大學 / 機械工程系所 / 96 / In recent years, the government has advocated the fishery automation policy (27) to encourage fishermen to use automatable machines when fishing. This school introduced the PV-150 live fish pump (IRAS, Denmark) for fish farm in 1993, and started system improvement and field planning and testing. The power supply of this fish pump mainly uses three-phase 380V, which is different from single-phase 110V and three-phase 220V of Taiwan (8), therefore, an additional transformer is required for operation to increase the voltage to 380V. Furthermore, the level controller of control assembly and the controller for water discharge time are imported parts, they are costly, hard to obtain, and have a high failure rate. As a result, fishermen are not willing to use this fish pump.
This study used (1) improved circuitry, e.g. driving motor armature winding is changed from Y connection to △ connection, the original level controller and controller for water discharge time are replaced by home-made relay, and the fuse reset key is moved to the panel, so as to make the operation smooth; (2) the flow field simulation software FLUENT is used for simulation experiment of pressure and velocity field of water storage bucket and two different fish sucking ports through numerical analysis. The simulation results showed that there is vortex flow below the inlet of water storage bucket which is likely to injure fish, and the concentric circle type fish sucking port has better suction efficiency than the other type. The fish sucking port is developed and improved according to the results of experiment, and the Tilapia and Cobia fish are used for actual operation to verify and compare the suction efficiency of fish pumps for fish. The results are taken as the reference for development and operation of fish pumps.
After the motor armature winding of this fish pump is changed to △ connection, the operation is more timesaving, the rotation speed of motor is increased from 1500rpm to 1792.6rpm, so the overall rotation speed is increased by about 1/5 rotation, and the conveying capacity is increased from 20 m3/hr to 24.61 m3/hr, the suction efficiency is relatively increased; the flow field analysis simulation of water storage bucket and two different suction ports quite matches the result of actual test, this simulation experiment is proven feasible. The Tilapia of the two different species of fish has preferred suction success rate, its injury rate and death rate in three days time are lower. Therefore, this type of fish pump is more suitable for Tilapia, and the concentric circle fish sucking port is better than the other type, the fish breeding density had better be 100~300; it has a high value of popularization.
| Identifer | oai:union.ndltd.org:TW/096NPUS5489021 |
| Date | January 2008 |
| Creators | Shin-Hua Chen, 陳士華 |
| Contributors | Ching-Chen Hsieh, Ching-Lu Hsieh, 謝欽城, 謝清祿 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 102 |
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