211G型單螺桿泵可無(wú)脈動(dòng)地工作 G型單螺桿泵工作時(shí),通過(guò)螺桿轉(zhuǎn)子與泵套的孔壁間形成的一個(gè)個(gè)密封腔,平穩(wěn)地從低壓區(qū)運(yùn)送到高壓區(qū),在整個(gè)運(yùn)送過(guò)程中,介質(zhì)作純軸向運(yùn)動(dòng),可完全做到無(wú)脈動(dòng)地運(yùn)送介質(zhì)。這一點(diǎn)與齒輪泵不同。齒輪泵工作時(shí),在齒輪的轉(zhuǎn)動(dòng)下,介質(zhì)作軸向與徑向及其復(fù)合方向的運(yùn)動(dòng),產(chǎn)生明顯的攪拌現(xiàn)象。其輸出壓力的表現(xiàn)形式:G型單螺桿泵的輸出壓力比較穩(wěn)定,齒輪泵則出口壓力會(huì)有波動(dòng)。這一點(diǎn)在輸送高粘度的介質(zhì)(如重油等)時(shí)比較突出。
E、抽油桿扶正器E, sucker rod cealizer抽油桿扶正器由心軸和扶正筒組成,它接在兩根抽油桿之間,被卡在兩個(gè)抽油桿接箍之間。心軸也就是一要極短的抽油桿短節(jié)。扶正筒是一個(gè)內(nèi)孔比心軸大1MM左右的空心塑料筒,外部有四個(gè)略比油管內(nèi)徑小的扶正翼,采取澆注成型。扶正筒可以圍繞心軸轉(zhuǎn)動(dòng),防止抽油桿旋轉(zhuǎn)時(shí)與內(nèi)壁接觸而磨蝕油管,又可以讓流體通過(guò)。The sucker rod cealizer is coed of the heart shaft and the upright cylinder, which is connected between the two sucker rods and is stuck between the two sucker rod hoops. The axis of the heart is also an extremely short rod short section. The centering cylinder is a hollow plastic tube inner hole Bixin shaft around 1MM, external four slightly smaller than the diameter of the tubing cealizer wing, adopt ting. The cealizer can revolve around the axis to prevent the sucker rod from touching the inner wall when it rotates, and it can also let the fluid pass through.

現(xiàn)將在現(xiàn)場(chǎng)采用同規(guī)格的G型單螺桿泵及齒輪泵在完全相同工況條件下并在輸送出口壓力為1 MPa時(shí)進(jìn)行了簡(jiǎn)單的對(duì)比,測(cè)量了這樣兩組數(shù)據(jù):當(dāng)輸送重油粘度約為75×102-6m2/ s時(shí),齒輪泵出口壓力表的指針跳動(dòng)幅度為±0.16,三螺桿泵出口壓力表的指針跳動(dòng)幅度為±0.05,雙螺桿泵出口壓力表的指針跳動(dòng)的幅度為±0.04 ;而當(dāng)輸送重油粘度約為150×102-6m2/ s時(shí),齒輪泵出口壓力表的指針跳動(dòng)幅度為±0.22,三螺桿泵出口壓力表的指針跳動(dòng)的幅度為±0.06,雙G型單螺桿泵出口壓力表的指針跳動(dòng)的幅度為±0.04。這說(shuō)明,莫諾,G型單螺桿泵在重油的輸送和噴燃過(guò)程中,介質(zhì)的輸送壓力很穩(wěn)定。并且隨著介質(zhì)粘度的加大,G型單螺桿泵(尤其是雙螺桿泵)的無(wú)脈動(dòng)特點(diǎn)相比之下更為明顯。
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