PUMPS AND PUMP-HEAD COMPRISING INTERNAL PRESSURE-ABSORBING MEMBER

PROBLEM TO BE SOLVED: To meet a need for pumps that exhibit reduced pressure pulsatility of the output stream of liquid that has been pumped.SOLUTION: A pump includes a pump housing 28 defining a pump cavity 38, a movable pumping member 34, 36 situated in the pump cavity 38, and at least one pressur...

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Hauptverfasser: GRIMES DAVID J, WARDLE KEITH J
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To meet a need for pumps that exhibit reduced pressure pulsatility of the output stream of liquid that has been pumped.SOLUTION: A pump includes a pump housing 28 defining a pump cavity 38, a movable pumping member 34, 36 situated in the pump cavity 38, and at least one pressure-absorbing member 56 located inside the pump housing 28. The housing 28 also has an inlet and an outlet, and includes at least one interior non-wearing location that contacts liquid in the pump housing 28 when the pump housing 28 is primed with the liquid. The at least one pressure-absorbing member 56 is located inside the pump housing 28 at the non-wearing location and contacts the liquid. The pressure-absorbing member 56 has a compliant property to exhibit a volumetric compression when subjected to a pressure increase in the liquid contacting the pressure-absorbing member 56. The volumetric compression is sufficient to alleviate at least a portion of the pressure increase. 【課題】汲み上げられた液体の出力ストリームの縮小圧力拍動性を示すポンプが求められている。【解決手段】ポンプキャビティ38、ポンプキャビティ38内に位置する可動ポンピング部材34,36、及びポンプハウジング28内に配置される少なくとも一つの圧力吸収部材56、を定義するポンプハウジング28を備える。ハウジングはまた、インレット及びアウトレットを有し、液体によって呼び水がされたとき、ポンプハウジング28の液体に接触する少なくとも一つの内部非磨耗区域を含む。少なくとも一つの圧力吸収部材56は、ポンプハウジング28内の非摩耗区域に配置され、液体に接触する。圧力吸収部材56は、圧力吸収部材56が接触する液体の中の圧力上昇を受けるとき、容量圧縮を示す対応特性を有する。容量圧縮は、圧力上昇の少なくとも一部を緩和するために十分である。【選択図】図1E