REXROTH插裝式溢流閥DBDS6G1X/200V R900437348，購買進口液壓、氣動、自動化控制工業配件，認準“上海韋米機電設備有限公司”，7年老店，保證產品原廠原裝，價格優惠，售后無憂，歡迎新老客戶咨詢采購！

 

溢流閥是一種液壓壓力控制閥，在液壓設備中主要起定壓溢流作用，穩壓，系統卸荷和安全保護作用。
定壓溢流作用：在定量泵節流調節系統中，定量泵提供的是恒定流量。當系統壓力增大時，會使流量需求減小。此時溢流閥開啟，使多余流量溢回油箱，保證溢流閥進口壓力，即泵出口壓力恒定（閥口常隨壓力波動開啟）。


穩壓作用：溢流閥串聯在回油路上，溢流閥產生背壓，運動部件平穩性增加。
系統卸荷作用：在溢流閥的遙控口串接溢小流量的電磁閥，當電磁鐵通電時，溢流閥的遙控口通油箱，此時液壓泵卸荷。溢流閥此時作為卸荷閥使用。
安全保護作用：系統正常工作時，閥門關閉。只有負載超過規定的極限（系統壓力超過調定壓力）時開啟溢流，進行過載保護，使系統壓力不再增加（通常使溢流閥的調定壓力比系統高工作壓力高10%～20%）。
實際應用中一般有：作卸荷閥用，作遠程調壓閥，作高低壓多級控制閥，作順序閥，用于產生背壓（串在回油路上）。


溢流閥一般有兩種結構：1、直動型溢流閥 。2、先導式溢流閥。
對溢流閥的主要要求：調壓范圍大，調壓偏差小，壓力振擺小，動作靈敏，過載能力大，噪聲小。
先導型溢流閥的導閥部分結構尺寸較小，調壓彈簧不必很強，因此壓力調整比較輕便。但因先導型溢流閥要在先導閥和主閥都動作后才能起控制作用，因此反應不如直動型溢流閥靈敏。
與三節同心結構相比，二節同心結構的特點是：①主閥芯僅與閥套和主閥座有同心度要求，免去了與閥蓋的配合，故結構簡單，加工和裝配方便。②過流面積大，在相同流量的情況下，主閥開啟高度小；或者在相同開啟高度的情況下，其通流能力大，因此，可做得體積小、重量輕。③主閥芯與閥套可以通用化，便于組織批量生產。

    
比例溢流閥的壓力等級要與系統所需要的壓力相適應，以確保較好的分辨率。 系統需要調節的高壓力是180bar，則比例溢流閥的壓力等級應該是210左右 .不應該是315bar等太高的等級。原則是盡量使比例溢流閥的高控制壓力略大于系統所需要的高壓力。
　　先使系統安全閥全開，比例溢流閥輸入電流為零，再起泵。然后保持安全閥為零，給比例閥輸入大電流 .慢慢調節手調安全閥的手柄，使系統壓力逐步上升，將比例閥輸入電流降下來，直到系統需要的高壓力，記錄對應當輸入電流數值。這就是系統要求的高壓力說對應的電流，如果用計算機控制或用信號發生器輸入，將這個電流為輸入電流的限制值。

1）電磁溢流閥原理上，一般是由先導式溢流閥加上一個2位2通電磁閥組成。
2）這個電磁閥實際上由兩部分組成：2位2通的液壓閥部分，加上一個電磁鐵。2位2通閥是開通，還是關閉，是由電磁鐵推動閥芯運動來實現的。有的閥電磁鐵通電時打開，有的閥電磁鐵斷電時打開，蘿目青菜個人各愛（根據系統要求選擇）。也就是說，電磁閥這里有一條通路一頭與先導溢流閥的某個部位相連，另一頭通過油管與油箱相連。通過操作電磁鐵可以讓先導溢流閥的某個部位或者與油箱相通，或者不與油箱相通。
 
3）先導溢流閥的主閥上腔壓力，是由先導閥加于控制的。如果先導閥正常工作，即主閥上腔有先導閥規定的壓力，則整個溢流閥就會在系統壓力到達調定壓力時其主閥口打開一定的開度，一方面能將系統多余流量流回油箱，另一方面又能維持系統的壓力為先導閥的調定值。可見，先導閥主要管壓力，主閥服從先導閥的領導，在先導閥動作時將主閥口開到合適大小，正好將多余流量流出去，又不影響系統壓力。
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一、液壓傳動技術的應用
液壓傳動技術在近代工業制造中的應用
液壓傳動有許多突出的優點，因此它的應用非常廣泛，如一般工業用的塑料加工機械、壓力機械、機床等，行走機械中的工程機械、建筑機械、農業機械、汽車等;鋼鐵工業用的冶金機械、提升裝置、軋輥調整裝置等;土木水利工程用的防洪閘門及堤壩裝置、河床升降裝置、橋梁操縱機構等，發電廠渦輪機調速裝置、發電廠等等。

二、液壓傳動技術的原理與特點
1、液壓傳動的介紹
液壓傳動是用液體作為工作介質來傳遞能量和進行控制的傳動方式。液壓傳動和氣壓傳動并稱為流體傳動，是根據17世紀帕斯卡提出的液體靜壓力傳動原理而發展起來的一門新興技術，是工農業生產中應用廣泛的技術。
2、液壓傳動的優點
(1)體積小、重量輕，因此慣性力較小，當突然過載或停車時，不會發生大的沖擊，
(2)能在給定范圍內平穩的自動調節牽引速度，并可實現無極調速;
(3)換向容易，在不改變電機旋轉方向的情況下，可以較方便地實現工作機構旋轉和直線往復運動的轉換;
(4)液壓泵和液壓馬達之間用油管連接，在空間布置上彼此不受嚴格限制;
(5) 由于采用油液為工作介質，元件相對運動表面間能自行潤滑，磨損小，使用壽命長;
(6)操縱控制簡便，自動化程度高;
(7)容易實現過載保護。
液壓傳動有許多突出的優點，因此它的應用非常廣泛，如一般工業用的塑料加工機械、壓力機械、機床等，行走機械中的工程機械、建筑機械、農業機械、汽車等，鋼鐵工業用的冶金機械、提升裝置、軋輥調整裝置等，土木水利工程用的防洪閘門及堤壩裝置、河床升降裝置、橋粱操縱機構等;發電廠渦輪機調速裝置等等，船舶用的甲板起重機械、船頭門、艙壁閥、船尾推進器等，特殊技術用的控制裝置、測量浮標、升降旋轉舞臺等。
3、液壓傳動的基本原理
液壓傳動的基本原理是在密閉的容器內，利用有壓力的油液作為工作介質來實現能量轉換和傳遞動力的。其中的液體稱為工作介質，一般為礦物油，它的作用和機械傳動中的皮帶、鏈條和齒輪等傳動元件相類似。液壓傳動是利用帕斯卡原理!帕斯卡原理是大概就是:在密閉環境中，向液體施加一個力，這個液體會向各個方向傳遞這個力!力的大小不變!液壓傳動就是利用這個物理性質，向一個物體施加一個力，利用帕斯卡原理使這個力變大!從而起到舉起重物的效果!
液壓傳動在閥門行業也得到很大的應用,如閥門的機床制造加工設備、閥門]液壓試驗設備、閥門的液壓傳動裝置等。

三、液壓傳動系統的組成
1、液壓動力原件
將動力裝置的機械能轉換成為液壓能的裝置，其作用是為液壓傳動系統提供壓力油,是液壓傳動系統的動力源。例如液壓泵。
1.1液壓泵
液壓泵是液壓系統的動力元件，其作用是將原動機的機械能轉換成液體的壓力能,指液壓系統中的油泵，它向整個液壓系統提供動力。液壓泵的結構形式一般有齒輪泵、葉片泵和柱塞泵。
1.2齒輪泵
齒輪泵即依靠密封在個殼體中的兩個或兩個以上齒輪,在相互嚙合過程中所產生的工作空間容積變化來輸送液體的泵。齒輪泵的概念是很簡單的，即它的基本形式就是兩個尺寸相同的齒輪在一個緊密配合的殼體內相互嚙合旋轉，這個殼體的內部類似“8”字形，兩個齒輪裝在里面,齒輪的外徑及兩側與殼體緊密配合。來自于擠出機的物料在吸入口進入兩個齒輪中間，并充滿這一空間，隨著齒的旋轉沿殼體運動，*后在兩齒嚙合時排出。困油現象齒輪泵要平穩工作，齒輪嚙合的重合度必須大于1, 于是總有兩對齒輪同時嚙合, :并有一部分油液被圍困在兩對輪齒所圍成的封閉容腔之間。這個封閉的容腔開始隨著
齒輪的轉動逐漸減小，以后又逐漸加大。封閉腔容積的減小會使被困油液受擠壓而產生很高的壓力，并且從縫隙中擠出，導致油液發熱，并致使機件受到額外的負載，而封閉腔容積的增大又造成局部真空，使油液中溶解的氣體分離，產生氣穴現象。這些都將產生強烈的振動和噪音，這就是齒輪泵的困意現象。
危害：徑向不平衡力很大時能使軸彎曲，齒頂與殼體接觸，同時加速軸承的磨損，降低軸承的壽命。
消除困油現象方法:通常是在兩側蓋板上開卸荷槽，使封閉腔容積誠小時通過左邊的卸荷槽與壓油腔相通，容積增大時通過右邊的卸荷槽與吸油腔相通。
1.3葉片泵
葉片泵即通過葉輪的旋轉，將動力機的機械能轉換為水能(勢能、動能、壓能)的水力機械。
葉片泵轉子旋轉時，葉片在離心力和壓力油的作用下，尖部緊貼在定子內表面上。這樣兩個葉片與轉子和定子內表面所構成的工作容積，先由小到大吸油后再由大到小排油，葉片旋轉一周時，完成兩次吸油與排油。
1.4柱塞泵
柱塞泵即利用柱塞在泵缸體內往復運動，使柱塞與泵壁間形成容積改變，反復吸入和排;出液體并增高其壓力的泵。
柱塞泵是液壓系統的一個重要裝置。它依靠柱塞在缸體中往復運動，使密封工作容腔的容積發生變化來實現吸油、壓油。柱塞泵具有額定壓力高、結構緊湊、效率高和流量調節方便等優點，被廣泛應用于高壓、大流量和流量需要調節的場合，諸如液壓機、工程機械和船舶中。