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液下泵由于使用了长轴，加之叶轮有不抵消的径向力，整个轴又为悬臂构造，因此旋转时在叶轮端导致了很大的挠度。轴越长，挠度越大。为了化解这一疑问，在轴上安装有滚珠轴承。但由于整根轴为挠性轴，滚珠轴承不停受到单边磨损，磨损量较大，滚珠轴承晃动剧烈，磨损速度加速，因此液下泵损坏频率较高。

液下泵(beng)与潜水(shui)泵(beng)有(you)什么区别？

1、电机(ji)不同：

液(ye)(ye)下(xia)泵：泵体潜(qian)入液(ye)(ye)下(xia)，电机(ji)与支(zhi)架(jia)在液(ye)(ye)上(shang)，电机(ji)属(shu)于干式电机(ji)，不能够潜(qian)入液(ye)(ye)下(xia)；

潜水泵：泵体和电机(ji)(ji)需一(yi)齐(qi)潜入输(shu)送的液体中(zhong)，电机(ji)(ji)密封水(shui)浸式潜水(shui)电机(ji)(ji)。

2、结(jie)构不同

液下泵：只(zhi)能为(wei)(wei)立式(shi)泵型，由于泵体竖起插入液下，因此只(zhi)能为(wei)(wei)立式(shi)构造；

潜水泵：可(ke)(ke)以是(shi)立(li)式构造，也可(ke)(ke)以为(wei)卧式构造，用户可(ke)(ke)以根据实际的工况要求来展开选择(ze)。

3、类型不同

液(ye)下(xia)泵类型：

①传统液下(xia)(xia)泵：这种液下(xia)(xia)泵的(de)轴(zhou)长(zhang)长(zhang)度不能太长(zhang)，比较(jiao)高3米(mi)以内(nei)，也就是液下(xia)(xia)深(shen)度比较(jiao)高是3米(mi)；

②长轴(zhou)液下泵(beng)：这种泵(beng)型是(shi)在传统液下泵(beng)的升级(ji)版，可以(yi)用扬水管(guan)连通增加(jia)液下尺寸。

潜水泵类型(xing)：

①井用(yong)(yong)(yong)(yong)潜水(shui)泵(beng)：包括充(chong)水(shui)式(shi)井用(yong)(yong)(yong)(yong)潜水(shui)电(dian)(dian)(dian)泵(beng)、充(chong)油式(shi)井用(yong)(yong)(yong)(yong)潜水(shui)电(dian)(dian)(dian)泵(beng)、屏(ping)蔽式(shi)井用(yong)(yong)(yong)(yong)潜水(shui)电(dian)(dian)(dian)泵(beng)以及干式(shi)井用(yong)(yong)(yong)(yong)潜水(shui)电(dian)(dian)(dian)泵(beng)等。

②小(xiao)型(xing)(xing)潜(qian)(qian)(qian)(qian)水(shui)(shui)(shui)(shui)(shui)泵(beng)(beng)(beng)：包括河流用潜(qian)(qian)(qian)(qian)水(shui)(shui)(shui)(shui)(shui)电(dian)泵(beng)(beng)(beng)，如(ru)QY型(xing)(xing)充油式(shi)(shi)(shi)(shi)(shi)潜(qian)(qian)(qian)(qian)水(shui)(shui)(shui)(shui)(shui)电(dian)泵(beng)(beng)(beng)、QS型(xing)(xing)充水(shui)(shui)(shui)(shui)(shui)式(shi)(shi)(shi)(shi)(shi)潜(qian)(qian)(qian)(qian)水(shui)(shui)(shui)(shui)(shui)电(dian)泵(beng)(beng)(beng)和(he)Q型(xing)(xing)干(gan)式(shi)(shi)(shi)(shi)(shi)潜(qian)(qian)(qian)(qian)水(shui)(shui)(shui)(shui)(shui)电(dian)泵(beng)(beng)(beng)、QN型(xing)(xing)干(gan)式(shi)(shi)(shi)(shi)(shi)内(nei)装(zhuang)式(shi)(shi)(shi)(shi)(shi)潜(qian)(qian)(qian)(qian)水(shui)(shui)(shui)(shui)(shui)电(dian)泵(beng)(beng)(beng)等(deng)；工程用潜(qian)(qian)(qian)(qian)水(shui)(shui)(shui)(shui)(shui)电(dian)泵(beng)(beng)(beng)，如(ru)QDX型(xing)(xing)单相(xiang)(xiang)干(gan)式(shi)(shi)(shi)(shi)(shi)下泵(beng)(beng)(beng)型(xing)(xing)潜(qian)(qian)(qian)(qian)水(shui)(shui)(shui)(shui)(shui)电(dian)泵(beng)(beng)(beng)、QX型(xing)(xing)三(san)相(xiang)(xiang)干(gan)式(shi)(shi)(shi)(shi)(shi)下泵(beng)(beng)(beng)型(xing)(xing)潜(qian)(qian)(qian)(qian)水(shui)(shui)(shui)(shui)(shui)电(dian)泵(beng)(beng)(beng)、QXN型(xing)(xing)三(san)相(xiang)(xiang)于(yu)式(shi)(shi)(shi)(shi)(shi)下泵(beng)(beng)(beng)内(nei)装(zhuang)式(shi)(shi)(shi)(shi)(shi)潜(qian)(qian)(qian)(qian)水(shui)(shui)(shui)(shui)(shui)电(dian)泵(beng)(beng)(beng)等(deng)。

③污(wu)水排(pai)泄(xie)物(wu)潜水泵(beng)(beng)：包(bao)括污(wu)水用潜水电泵(beng)(beng)、排(pai)泄(xie)物(wu)用潜水电泵(beng)(beng)、纤维(wei)排(pai)泄(xie)物(wu)用潜水电泵(beng)(beng)。

④矿(kuang)用(yong)潜水(shui)泵：包(bao)括矿(kuang)用(yong)隔爆型潜水(shui)电(dian)泵和矿(kuang)用(yong)普通(tong)型潜水(shui)电(dian)泵。

⑤轴流潜水泵。

⑥高压(ya)潜(qian)水(shui)泵(beng)：包括矿、井(jing)用(yong)高压(ya)潜(qian)水(shui)电(dian)泵(beng)和平常用(yong)高压(ya)潜(qian)水(shui)电(dian)泵(beng)。

⑦海水、盐场用潜水泵等。