| 摘要 |
submersible pumps. SUBSTANCE: invention relates to automatic control devices operating in response to pickups of upper and lower water levels in reservoir. Proposed automatic control device of submersible electric pump has level pickup with upper and lower level contacts, dc relay magnetic starter connecting electric pump to supply circuit, step-down transformer, rectifier bridge and circuit breaker. Control circuit of dc relay is connected to rectifier bridge output. Input of bridge is connected with secondary winding of step-down transformer through supply circuit made in form of parallel-connected branches one of which forms closing contacts of upper level and the other forms series-connected closing contacts of dc relay and opening contacts of lower level relay. Contacts of pickup are parallel plates or concentric tubes. EFFECT: simplified design, improved reliability and repairability of pumps operating in the country. 2 cl, 1 dwg
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