泵站設(shè)計(jì)關(guān)鍵ppt課件-wenkub
2023-01-30 00:01:09 本頁面
【正文】 op level must be as close as possible to ? 啟停液位應(yīng)盡可能滿足 ?design the tank size by optimizing the effective volume ?優(yōu)化有效容積 ,設(shè)計(jì) 井筒尺寸 At least at the top of the motor 最小到電機(jī)的頂部 Effective Volume 有效容積 ?2 Start level 啟泵液位 Stop level 停泵液位 ?2 Effective Volume 有效容積 G r u n d f o s F L O W T H I N K I N G8 ? It is very important to get the distance between start and stop right. ? 啟 /停液位之間的距離非常重要 ? The start level and stop level must be as close as possible to ? 啟停液位應(yīng)盡可能滿足 ?design the tank size by optimizing the effective volume ?通過優(yōu)化有效容積設(shè)計(jì)井筒尺寸 At least at the top of the motor 最小到電機(jī)的頂部 Effective Volume 有效容積 ?2 Start level 啟泵液位 Stop level 停泵液位 ?2 Effective Volume 有效容積 G r u n d f o s F L O W T H I N K I N G9 ? The start level and stop level must be as close as possible to ? 啟停液位的距離應(yīng)盡可能小，從而 ?shorten the stay time of the wastewater ?縮短廢水停留時(shí)間 ?Reduce the performance variation Q, H and η ?減少 Q, H and η的變化 At least at the top of the motor 最小到電機(jī)的頂部 Effective Volume 有效容積 ?2 Start level 啟泵液位 Stop level 停泵液位 ?2 Effective Volume 有效容積 G r u n d f o s F L O W T H I N K I N G10 ?2 Effective Volume 有效容積 ? The right distance between start and stop is very important: ? 啟停液位之間的距離非常重要 – To short a distance may cause overload of the motor due to many start and stop. – 距離太近，電機(jī)頻繁啟停導(dǎo)致過載。 principle: principle that states that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid. 阿基米德定律： 浸入液體的物體所受的浮力等于排出液體的重力 ?The force from the uplift (FUplift) is equal to the weight of the displaced water ?浮力 (FUplift)等于排出液體的重力 FUplift Displaced water 排出液體 G r u n d f o s F L O W T H I N K I N G28 Formula for calculating the weight of displaced water 計(jì)算排出液體重量的公式 The uplift must be prevented by making an slightly bigger down force 通過比浮力大向下的力抗浮 Fdown FUplift Putting material around the slab area, will create the Fdown 在底部區(qū)域放置重物能產(chǎn)生向下的力 Density of concrete/gravel : ρwater = 2 2,5 混凝土的比重 Density of water : ρwater = 1 水的比重 Slab area (sa) The trick is to make the pit heavier than the weight of the displaced water 解決方法為讓泵站比排出液體的重量重 What is uplift? 什么是浮力 2u p l if tF = wa te rrH??? ? ?H r FUplift FDown 2do w nF = ( sl a b a r e a ) m ate r ialrH??? ? ?G r u n d f o s F L O W T H I N K I N G29 My pit must be installed in the street?? 泵站需要安裝在街道上 ? The consultants want to install the pit in a area with heavy traffic. ? 客戶需要將泵站安裝在交通繁忙的區(qū)域 ? Which solution
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