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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="bqsuwdf" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shanghaimaihe/637382847503574219/5462410.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="mbtqsuw" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>軟管總成流體技術(shù),流體</p><p><span>***更新：</span>2020-12-23 22:24:53</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="uolnuwy" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海邁頜信息科技有限公司</a></p><p><span>聯(lián)系人：</span>王欽</p><p><span>郵箱: </span>834334323@qq.com</p><p><span>電話: </span>18917232386</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span>http://www.maihetech.com</p><p><span>手機: </span>021-62086881</p><p><span>地址: </span>上海市松江區(qū)九亭鎮(zhèn)九亭中心路1158號21幢708室-2A</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="rqxzg2b" class="page-proshow02"><p class="title">詳細說明</p><div id="wlszmlx" class="box"><p><p style="text-indent:25px">伯努利從經(jīng)典力學的能量守恒出發(fā)，研究供水管道中水的流動，精心地安排了實驗并加以分析，得到了流體定常運動下的流速、壓力、管道高程之間的關(guān)系--伯努利方程。歐拉方程和伯努利方程的建立，是流體動力學作為一個分支學科建立的標志，從此開始了用微分方程和實驗測量進行流體運動定量研究的階段。從18世紀起，位勢流理論有了很大進展，軟管總成流體技術(shù)，軟管總成流體技術(shù)，在水波，軟管總成流體技術(shù)、潮汐、渦旋運動、聲學等方面都闡明了很多規(guī)律。法國拉格朗日對于無旋運動，德國赫爾姆霍茲對于渦旋運動作了不少研究……。在上述的研究中，流體的粘性并不起重要作用，即所考慮的是無粘流體。這種理論當然闡明不了流體中粘性的效應。拉格朗日描述法：通過對各流體質(zhì)點的運動規(guī)律的觀察，確定整個流場的運動規(guī)律。軟管總成流體技術(shù)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="軟管總成流體技術(shù),流體" src="https://tyunfile.71360.com/UploadFile/shanghaimaihe/637382847503574219/5462410.png"></div><p style="text-indent:25px">聯(lián)軸器于各種不同主機產(chǎn)品配套使用: 聯(lián)軸器于各種不同主機產(chǎn)品配套使用，周圍的工作環(huán)境比較復雜，如溫度、濕度、水、蒸汽、粉塵、砂子、油、酸、堿、腐蝕介質(zhì)、鹽水、輻射等狀況，是選擇聯(lián)軸器時必須考慮的重要因素之一。要求聯(lián)軸器具有較高的傳動精度，宜選用非金屬彈性元件的撓性聯(lián)軸器。大轉(zhuǎn)矩和傳遞動力的軸系傳動，對傳動精度沒有要求，高轉(zhuǎn)速時，應避免選用金屬彈性元件彈性聯(lián)軸器和可動元件之間的間隙的撓性聯(lián)軸器，宜選用傳動精度高的膜片聯(lián)軸器。對于高溫、低溫、有油、酸、堿介質(zhì)的工作質(zhì)量，不宜選用以一般橡膠為彈性元件材料的撓性聯(lián)軸器，應選擇金屬彈性元件撓性聯(lián)軸器，例如膜片聯(lián)軸器、蛇形彈簧聯(lián)軸器等。卷管器流體工具生產(chǎn)商單組分氣體、多組分氣體或彼此能溶解的液體都是單相流體。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="軟管總成流體技術(shù),流體" src="https://tyunfile.71360.com/UploadFile/shanghaimaihe/637382847518437500/8034222.png"></div><p style="text-indent:25px">聯(lián)軸器的對中：對中的意義及允許偏差聯(lián)軸器所連接兩軸的對中，也稱找正。軸的準確對中，可使整個傳動系統(tǒng)運行平穩(wěn)，不會產(chǎn)生異常振動、噪聲和異常磨損，也不會產(chǎn)生不正常的附加載荷，這對確保系統(tǒng)安全可靠運行，尤其是對高速回轉(zhuǎn)軸系，具有十分重要的意義。實際安裝時應使兩軸的徑向及角向偏差越銷越好，這主要是考慮到設(shè)備運行過程中不可避免地存在著如基礎(chǔ)下沉、各部件的不均勻熱膨脹、軸的彎曲、零部件的磨損等各種情況，這些都會對軸系的對中產(chǎn)生不利的影響，因此安裝時控制徑向及角向安裝偏差，一般可將其控制在允許偏差的1/8~1/3，這將會為運行過程中產(chǎn)生新的偏移留下一定的補償空間，從而確保運行時兩軸仍能對中良好并安全運行。</p><p style="text-indent:25px">流體性質(zhì)：壓縮性和膨脹性需要指出：在一般情況***體的壓縮系數(shù)和膨脹系數(shù)都很小。對于能夠忽略其壓縮性的流體稱為不可壓縮流體。不可壓縮流體的密度和重度均可看作常數(shù)。反之，對于壓縮系數(shù)和膨脹系數(shù)比較大，不能被忽略，或密度和重度不能看成常數(shù)的流體稱為可壓縮流體。但是，可壓縮流體與不可壓縮流體的劃分并不是確定的。例如，通常把氣體看成可壓縮流體。但是，當氣體的壓力和溫度在整個流動過程中變化很小時(如通風系統(tǒng))，它的重度和密度的變化也很小，可近似地看為常數(shù)。再如，當氣體對于固體的相對速度比在這種氣體中當時溫度下的音速小得多時，氣體密度的變化也可以被忽略，對于能把氣體的密度看成常數(shù)的情況，可按不可壓縮流體來處理。一定體積***體分子數(shù)目少，分子間作用力小，分子的無規(guī)則熱運動強烈，故易流動。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="軟管總成流體技術(shù),流體" src="https://tyunfile.71360.com/UploadFile/shanghaimaihe/637382847479892578/6030473.png"></div><p style="text-indent:25px">當來流速度接近或超過聲速時，會產(chǎn)生激波，帶來額外的激波阻力。本質(zhì)上說，激波阻力也是一種壓差阻力，是由于激波的存在，使物體后半部的壓力恢復不夠而造成的。忽略黏性損失，當沒有激波時，氣流在物體后半部減速對應一個壓升Δp1 ；當存在激波時，氣流經(jīng)過激波時部分損失了部分機械能，同樣的減速對應的壓升Δp2 就會比Δp1 要小。因此，有激波時物體后半部的壓力要低一點，這就是激波阻力的來源。把物體前緣做成尖的可以減小激波錐角，從而減小激波帶來的損失，也就減小了激波阻力。船在水面行進時會產(chǎn)生水面波，也會有波阻力，所以要做成尖頭的，而在水下行進的潛艇則是圓頭的。液體的分子距很小，分子間的引力較大，分子間相互制約，分子可以作無一定周期和頻率的振動。上海電纜卷筒流體工具專賣</p><p style="text-indent:25px">在一定條件下，氣體和液體的分子大小并無明顯差異。軟管總成流體技術(shù)</p><p style="text-indent:25px">聯(lián)軸器可分為剛性聯(lián)軸器和撓性聯(lián)軸器兩大類。剛性聯(lián)軸器不具有緩沖性和補償兩軸線相對位移的能力，要求兩軸嚴格對中，但此類聯(lián)軸器結(jié)構(gòu)簡單，制造成本較低，裝拆．、維護方便，能保證兩軸有較高的對中性，傳遞轉(zhuǎn)矩較大，應用普遍。常用的有凸緣聯(lián)軸器、套筒聯(lián)軸器和夾殼聯(lián)軸器等。撓性聯(lián)軸器又可分為無彈性元件撓性聯(lián)軸器和有彈性元件撓性聯(lián)軸器，前一類只具有補償兩軸線相對位移的能力，但不能緩沖減振，常見的有滑塊聯(lián)軸器、齒式聯(lián)軸器、萬向聯(lián)軸器和鏈條聯(lián)軸器等；后一類因含有彈性元件，除具有補償兩軸線相對位移的能力外，還具有緩沖和減振作用，但傳遞的轉(zhuǎn)矩因受到彈性元件強度的限制，一般不及無彈性元件撓性聯(lián)軸器，常見的有彈性套柱銷聯(lián)軸器、彈性柱銷聯(lián)軸器、梅花形聯(lián)軸器、輪胎式聯(lián)軸器、蛇形彈簧聯(lián)軸器和簧片聯(lián)軸器等。軟管總成流體技術(shù)</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2530584.html</p></div></div></div></div></div><div id="vkhur2d" class="page-right twoColRt"><div id="i8jxnxz" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="vzbta8g" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應" 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