low head pump 中文意思是什麼
low head pump
解釋
低壓頭泵-
It is a vane pump with high head, small flow and low specific speed, which is smaller, flight and simpler in structure than positive displacement pump mulfistage centrifugal pump, and may handle liquid of high gas or steam content
該泵是一種高揚程，低比速的葉片泵，比容積式泵和多級離心泵體積小、重量輕、機構簡單等優點，並可以輸送氣體或蒸氣含量較輕的液體。 -
A new type of very low specific speed pump ? roto - jet pump is presented for low flowrate and high head transportation, which is introduced at the end of the thesis
論文最後主要研究了一種隸屬于極低比轉數離心泵范疇的新型泵? ?旋噴泵，它是一種新型的石油化工用泵，具有流量小、揚程高、流量揚程曲線平緩的特點。 -
The company uses the low pressure casting in producing such as gasoline pump body, cylinder head, moto cylinder head and so on other aluminum alloy casting products, which has yearly capability of 3 million aluminum alloy castings and 200, 000 pcs finished products output, and is continuously evaluated as " advanced unit on quality ", " the excellent supplier ", " the high - quality
公司採用低壓鑄造生產汽車油泵體氣缸蓋摩托氣缸蓋等鋁合金鑄件產品，具有年產300萬件鋁合金鑄件的能力。公司連續多年被主機廠評為「質量先進單位」 「優秀供應商」 「優質服務獎」 。 -
First super - low specific - speed centrifugal pump has a long and narrow flow passage for its high head and low capacity, and the power absorbed by disc friction is too high, so the efficiency is very low ; secondly the diffusion of flow passage is so high, that the reserved flow often emerges at the inlet and outlet of impeller. therefore the h ~ q characteristic curve is often hump - shaped, and at the low - capacity operating condition the instability often occurs ; thirdly the centrifugal pump at high - capacity operating condition is easy to overload because the n ~ q curve appears a rising trend
首先由於它的揚程較高、流量較小，所以它的流道狹長，圓盤摩擦損失較大，效率相對較低；其次由於它的流道擴散較嚴重，易在葉片進口產生迴流和在出口產生脫流，揚程流量特性曲線易出現駝峰，在小流量工況下易產生不穩定現象；第三，由於其功率流量曲線呈現上升趨勢，在大流量區運行時電機易過載。
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