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計量泵技術(shù)
您的當(dāng)前位置：巴特首頁 > 技術(shù)支持 > 計量泵技術(shù) >齒輪計量泵流量減小的原因及措施
來源：巴特計量泵、齒輪泵公司 發(fā)布時間：2013-12-13 17:07:36 瀏覽次數(shù)：次
近搜索引擎我看有人搜索關(guān)于齒輪計量泵流量小問題的原因，所以特別寫了以下關(guān)于齒輪計量泵流量小的原因和措施，希望對你能又說幫助。
?。ㄒ唬X輪計量泵輸出流量不足或減小的原因
?。ㄒ唬X輪計量泵輸出流量不足或減小的原因
①油溫高將使其黏度下降、內(nèi)泄漏增加，使泵輸出流量減小。應(yīng)查明原因采取措施；對于中高壓齒輪泵，須檢查密封圈是否破損。
②選用油的黏度過高或過低，均會造成泵的輸出流量減少，應(yīng)使用黏度合格的油品。
?、跜B-B型齒輪泵一般不可以反轉(zhuǎn)，如泵體裝反，將造成壓油腔與吸油腔局部短接，使其流量減少甚至吸不上油來。此時，應(yīng)查泵的轉(zhuǎn)向。
?、馨l(fā)動機轉(zhuǎn)速不夠，造成流量減小。應(yīng)查明原因并加以排除。
（二）齒輪計量泵的流量
1.理論上帶到排出腔的油液體積應(yīng)等于齒間工作容積。
2.每轉(zhuǎn)的Qt應(yīng)為兩個齒輪全部齒間工作容積之和。
3.可假設(shè)齒間工作容積與齒的有效體積相等。
4.每轉(zhuǎn)Qt
1）是一個齒輪的齒間工作容積與輪齒有效體積的總和
2）近似等于齒的有效部分所掃過的一個徑向?qū)挾葹?m（m為模數(shù)）的環(huán)形體積
?。ㄈ? 用上述計算泵的Qt時，數(shù)值偏小應(yīng)乘上修正系數(shù)K。
平均Qt為： Qt=K· D·2m·B·n×10-6 L/min
平均Qt為： Qt=K· D·2m·B·n×10-6 L/min
式中：D——分度圓直徑，mm；
m——模數(shù)，mm；
B——齒寬，mm；
n——轉(zhuǎn)速，r/min；
K——修正系數(shù)，一般為1．05～1．15。
中、低壓齒輪泵為使流量公式
Qt=6.66zm2Bn·10-6 n L/min (2—4)
高壓齒輪泵的流量公式：
Qt=7zm2Bn·10-6 L/min (2—5)
?。ㄋ模┨岣啐X輪泵理論流量的途徑
增加齒輪的直徑、齒寬、轉(zhuǎn)速n和減少齒數(shù)。
n過高會使輪齒轉(zhuǎn)過吸入腔的時間過短
n和直徑增加使齒輪的圓周速度增加，離心力加大
1.增加吸入困難，齒根處油壓p降低，可能析出氣體，導(dǎo)致Q減小，造成振動和產(chǎn)生噪聲，甚至使泵無法工作
2.故大圓周速度應(yīng)根據(jù)所輸油的粘度而予以限制，
1）大圓周速度不超過5～6m/s，
2)高轉(zhuǎn)速一般在3000r/min左右。
加大齒寬會使徑向力增大，齒面接觸線加長，不易保持良好的密封。
減少齒數(shù)雖可使齒間容積V加大而Q增加，但會使Q的不均勻度加重。
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