建水機械密封又叫端面密封，在有關標準中是這樣定義的：由至少一對垂直于旋轉軸線的端面在流體壓力和補償機構彈力的作用以及輔助密封的配合下保持貼合并相對滑動而構成的防止流體泄漏的裝置。帶有平衡罐的自身壓力增壓系統是一種壓力傳遞機構，用于雙端面建水機械密封，以解決現(xian)有(you)的循(xun)(xun)環(huan)水泵(beng)的部分揚(yang)程不(bu)能克服系統的阻力，在循(xun)(xun)環(huan)泵(beng)流量不(bu)變(bian)的情況下，一(yi)旦(dan)循(xun)(xun)環(huan)泵(beng)的揚(yang)程提高，則循(xun)(xun)環(huan)泵(beng)所(suo)配電機功率將大幅提高，設備運行電費也隨之(zhi)增加的問題。

　　自身壓(ya)(ya)力增壓(ya)(ya)系統結構包括(kuo)出(chu)水(shui)(shui)(shui)(shui)(shui)口(kou)、固(gu)(gu)(gu)(gu)定(ding)(ding)(ding)(ding)法蘭、泵(beng)體(ti)、增壓(ya)(ya)裝(zhuang)置(zhi)、電機轉子(zi)、吊環、防護罩(zhao)、水(shui)(shui)(shui)(shui)(shui)泵(beng)、固(gu)(gu)(gu)(gu)定(ding)(ding)(ding)(ding)基(ji)座、底座、加(jia)固(gu)(gu)(gu)(gu)件、控制閥、緊(jin)固(gu)(gu)(gu)(gu)件，所述出(chu)水(shui)(shui)(shui)(shui)(shui)口(kou)與(yu)固(gu)(gu)(gu)(gu)定(ding)(ding)(ding)(ding)法蘭相(xiang)(xiang)(xiang)連(lian)(lian)接，泵(beng)體(ti)與(yu)增壓(ya)(ya)裝(zhuang)置(zhi)相(xiang)(xiang)(xiang)連(lian)(lian)接，增壓(ya)(ya)裝(zhuang)置(zhi)由進水(shui)(shui)(shui)(shui)(shui)口(kou)、水(shui)(shui)(shui)(shui)(shui)管、負(fu)壓(ya)(ya)室、平衡固(gu)(gu)(gu)(gu)定(ding)(ding)(ding)(ding)盤、緊(jin)固(gu)(gu)(gu)(gu)支(zhi)架組成，進水(shui)(shui)(shui)(shui)(shui)口(kou)與(yu)水(shui)(shui)(shui)(shui)(shui)管相(xiang)(xiang)(xiang)連(lian)(lian)接，水(shui)(shui)(shui)(shui)(shui)管與(yu)負(fu)壓(ya)(ya)室相(xiang)(xiang)(xiang)連(lian)(lian)接，負(fu)壓(ya)(ya)室通(tong)過平衡固(gu)(gu)(gu)(gu)定(ding)(ding)(ding)(ding)盤保(bao)持平衡，緊(jin)固(gu)(gu)(gu)(gu)支(zhi)架與(yu)泵(beng)體(ti)固(gu)(gu)(gu)(gu)定(ding)(ding)(ding)(ding)連(lian)(lian)接，防護罩(zhao)與(yu)水(shui)(shui)(shui)(shui)(shui)泵(beng)相(xiang)(xiang)(xiang)連(lian)(lian)接，水(shui)(shui)(shui)(shui)(shui)泵(beng)與(yu)固(gu)(gu)(gu)(gu)定(ding)(ding)(ding)(ding)基(ji)座相(xiang)(xiang)(xiang)連(lian)(lian)接，固(gu)(gu)(gu)(gu)定(ding)(ding)(ding)(ding)基(ji)座與(yu)底座緊(jin)固(gu)(gu)(gu)(gu)連(lian)(lian)接，底座上設有加(jia)固(gu)(gu)(gu)(gu)件，緊(jin)固(gu)(gu)(gu)(gu)件)與(yu)底座固(gu)(gu)(gu)(gu)定(ding)(ding)(ding)(ding)連(lian)(lian)接。

　　由于(yu)(yu)活(huo)(huo)(huo)塞(sai)(sai)體上(shang)端(duan)(duan)的(de)(de)承(cheng)壓(ya)(ya)面(mian)(mian)積比活(huo)(huo)(huo)塞(sai)(sai)體下(xia)端(duan)(duan)的(de)(de)承(cheng)壓(ya)(ya)面(mian)(mian)積減少了一根活(huo)(huo)(huo)塞(sai)(sai)桿的(de)(de)面(mian)(mian)積，因此，密封(feng)(feng)(feng)油壓(ya)(ya)力按(an)兩(liang)端(duan)(duan)承(cheng)壓(ya)(ya)面(mian)(mian)積反比例地(di)增加(jia)，從而保證密封(feng)(feng)(feng)條件(jian)。設計(ji)活(huo)(huo)(huo)塞(sai)(sai)兩(liang)端(duan)(duan)承(cheng)壓(ya)(ya)面(mian)(mian)積之比時(shi)(shi)，應根據所要(yao)(yao)求的(de)(de)密封(feng)(feng)(feng)腔(qiang)與(yu)釜內的(de)(de)壓(ya)(ya)力差來計(ji)算(suan)。活(huo)(huo)(huo)塞(sai)(sai)桿上(shang)裝有彈簧，調節彈簧的(de)(de)壓(ya)(ya)縮量，使(shi)彈簧力正好抵消(xiao)活(huo)(huo)(huo)塞(sai)(sai)上(shang)O形圈對缸壁(bi)的(de)(de)摩擦力，以(yi)減少壓(ya)(ya)差計(ji)算(suan)值(zhi)與(yu)實(shi)際之間的(de)(de)誤差。此外，活(huo)(huo)(huo)塞(sai)(sai)升降還(huan)有指(zhi)示(shi)平(ping)衡(heng)(heng)罐中(zhong)液位(wei)的(de)(de)作用。當密封(feng)(feng)(feng)液漏(lou)泄需要(yao)(yao)補充時(shi)(shi)，可用手動泵加(jia)注(zhu)(zhu)密封(feng)(feng)(feng)液。在使(shi)用時(shi)(shi)需注(zhu)(zhu)意(yi)活(huo)(huo)(huo)塞(sai)(sai)應經常處于(yu)(yu)平(ping)衡(heng)(heng)罐的(de)(de)下(xia)部位(wei)置，使(shi)活(huo)(huo)(huo)塞(sai)(sai)有向(xiang)上(shang)移動的(de)(de)余地(di)。