大型混流泵A沙河大型混流泵300HW-5
However, improper installation, long use time or poor maintenance, but also easy to wear or destroy. Rolling bearings In addition to the individual parts can be replaced with new, generally have to replace the whole parts. The mouth ring is also called a leak reduction or grinding ring. It is one of the most wear-prone parts in the pump. After wear can be repaired or replaced with new. When replacing the new leak reduction ring, its inner diameter should be configured according to the outer diameter of the impeller inlet. If the impeller inlet diameter wear, can be turning processing, in order to eliminate trench marks and ellipses, and then configure the internal diameter reduction of the leakage ring, impeller inlet diameter can generally be turning three times. Filler after a long time will harden and lose elasticity, will make the pump leakage, leakage, generally should replace the new filler. Oil seal is rubber products, easy to wear and aging, generally have to replace new parts. Parameters and properties of water pump (1) The main beters of the pump pump beters are the main technical data of the pump's operating perbance, including flow, lift, speed, efficiency and ratio of the number of revolutions. Flow rate (Q) The flow rate of the pump refers to the amount of liquid discharged during the unit time.
*技術參數(shù)
(2)改變轉(zhuǎn)速的方法:改變皮帶輪外徑或改變齒輪減速器傳動比,也可選用不同轉(zhuǎn)速的動力機。jdhuiquan717
(3)水泵轉(zhuǎn)速改變后,其流量(Q)、揚程(H)和功率(N)的變化關系如下式所示: Q1=Q*n1/n H1=H*(n1/n)2 N1=N*(n1/n)3
式中:Q1、H1、N.分別代表轉(zhuǎn)速改變后的流量、揚程和功率。 Q、H、N分別代表規(guī)定轉(zhuǎn)速下的流量、揚程和功率。
(4)水泵轉(zhuǎn)速提高后,耗用功率增加,吸上真空度降低,壽命縮短。過分提高轉(zhuǎn)速會發(fā)生其它事故,故應慎用。
(5)水泵轉(zhuǎn)速過分降低時,泵的使用效益低,為此,應盡量避免泵在過低轉(zhuǎn)速下運行。用戶應按性能曲線圖選擇使用。
大型混流泵A沙河大型混流泵300HW-5
因此吸水揚程=實際吸水揚程+吸水損失揚程出水揚程=實際出水揚程+出水損失揚程損失揚程=吸水損失揚程+出水損失揚程總揚程=實際揚程+損失揚程由于水泵銘牌上標明的揚程是上述水泵的總揚程。因此不能誤認為銘牌上的揚程是實際揚程數(shù)值,水泵的實際揚程都比水泵銘牌上的揚程數(shù)值小。因此在確定水泵揚程時,這一點要特別注意。否則,如果只按實際揚程來確定水泵的揚程,訂購來的水泵揚程就低了,那可能會降低水泵的效率,甚至打不上水來。損失揚程與管路上的水管和附件種類(低閥、閘閥、逆止閥、直管、彎管)、數(shù)量、水管內(nèi)徑、管長、水管內(nèi)壁粗糙程度以及水泵流量等都有密切關系,這一點在管路設計和選配水管和附件時也應注意。允許吸上真空高度(Hs)允許吸上真空高度是指真空表讀數(shù)吸水揚程。
2、允許吸上真空度[Hs]與必需汽蝕余量[NPSH]r的換算關系:
[Hs]≈10-[HPSH]c
[NPSH]r≈[NPSH]C+0.3
式中:[Hs]-允許吸上真空度 米
[NPSH]C-臨界汽蝕余量 米
[NPSH]r-必需汽蝕余量 米
*特征描述
HW 型蝸殼式混流泵是按國家標準最新系列而設計的高節(jié)能產(chǎn)品。其性能指標均達到國際先進水平,省材節(jié)能效果顯著。延伸搜索:水環(huán)真空泵
(一)用途
HW型混流泵為臥式、單級、單吸、懸臂蝸殼式混流泵,適用于農(nóng)田排灌、工業(yè)、城鎮(zhèn)給排水及船塢、碼頭引水等。延伸搜索:水環(huán)真空泵
(二)特點
體積小、重量輕、流量大、效率高,汽蝕性能好,高效區(qū)范圍寬廣而平坦,結(jié)構(gòu)簡單,使用管理方法,維修容易。延伸搜索:水環(huán)真空泵
(三)型號說明
以250HW—8為例:
250—泵進(出)水口直徑為250毫米。
8—泵總揚長為8米。
(四)水泵的傳動方式
我廠生產(chǎn)的HW型系列混流泵均機(電)兩用,其轉(zhuǎn)動方式視各地區(qū)動力情況而定,訂貨時根據(jù)原動機的型號(功率、轉(zhuǎn)速)確定水泵的傳動方式,以定皮帶輪的大小或聯(lián)軸器的規(guī)格。延伸搜索:水環(huán)真空泵
(五)水泵轉(zhuǎn)向:
從水泵進水口看葉輪為逆時針方向旋轉(zhuǎn)(即箭頭所示的方向旋轉(zhuǎn))。
大型混流泵A沙河大型混流泵300HW-5
不能隨意選擇要根據(jù)實際需求來進行選擇。首選要對電動機接地裝置進行檢查。對于臥式混流泵與電動機共軸的電泵。電動機需要在適合的位置上設有一定數(shù)量的接地螺釘,而且需要在接地螺釘附近設有接地標志;同時臥式混流泵還需要有可靠的接地裝置和接地線,線上需要有較為明顯的接地標志,這種接地標志需要在電機使用期內(nèi)不會被磨掉。這點是臥式混流泵的重要安全指標之一在選購的時候可要多加注意。混流泵的性能與和離心泵比較,揚程低一些,而流量大一些;與軸流泵比較,揚程高一些,流量小一些?;炝鞅玫男阅芮€形狀也是介于離心泵和軸流泵之間,對于高揚程混流泵,其流量與揚程、流量與功率的相互關系變化規(guī)律接近于離心泵,在使用上,可采用關閉閥門啟動。
Instructions for use (i) the HW mixed-flow pump is composed of main parts such as pump body, pump cover, impeller, pump shaft and bearing body. (Ii) The pump cover is a part of the pump connected to the inlet pipe, with a specified axial end gap between the end surface and the impeller (maintaining the specified axial bance after eliminating the axial activity gap of the bearing). The gap is too small to produce friction, too large will lead to the pump pressure water reflux, so that the pump efficiency is reduced, through the increase or decrease adjustment paper pad to meet the required requirements of the gap. Extended search: Water ring Vacuum Pump (iii) The sealing device is composed of a filler letter, a water seal letter, a filler cover and a lead powder (or oil immersion) asbestos root. Its role is: 1, in the tea to prevent air inhalation pump, play a sealing role. 2. When pumping, prevent water from flowing out of the pump too much along the shaft. (Iv) Shaft application to protect the shaft does not make it directly friction with the filler, if long-term use found that the bushing wear too much, can change the bushing. (V) The two supports of the pump shaft are bearings in the bearing body, and the bearing has an appropriate amount of grease in its body to lubricate the bearings. (Vi) The baffle on the shaft prevents water from flowing into the bearing body along the pump, thus protecting the bearing and extending its service life.
用途/應用領域
混流泵混流泵是一種比轉(zhuǎn)速較高的泵型,廣泛應用于農(nóng)田灌溉,防澇排洪,污水處理,電站冷卻系統(tǒng)等領域.在大流量,低揚程的應用場合下,軸流泵揚程,流量變化范圍小,高效區(qū)窄,抗汽蝕性能差,使用混流泵代替軸流泵,能夠在發(fā)揮軸流泵優(yōu)點的基礎上補償這些缺點,從而取得更好的使用效果.
高比轉(zhuǎn)速混流泵的設計方法
軸面流動計算
采用流線迭代法求解軸面流動.流線迭代法基于沿任意準正交線的軸面速度梯度方程和流體運動的連續(xù)方程,根據(jù)各子流道流量相等的原則,迭代求解沿準正交線的軸面速度梯度方程即可得到軸面流網(wǎng).通過流線迭代法,在確定軸面流道輪廓之后,可以通過所需時間很短的迭代計算過程得到精確的軸面流網(wǎng).圖1是流網(wǎng)所對應的軸面速度沿軸面流線的分布圖.
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