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DBDS10P18/315 10通徑板式安裝溢流閥 德國(guó)博世力士樂(lè)REXROTH溢流閥 電磁溢流閥
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DBDS10P18/315 10通徑板式安裝溢流閥
溢流閥的性能指標(biāo)
(1)溢流閥靜態(tài)調(diào)壓偏差 閥的調(diào)定壓力與開(kāi)啟壓力之差稱為靜態(tài)調(diào)壓偏差。溢流流量對(duì)系統(tǒng)壓力的影響一般在2~4kgf/cm2左右。調(diào)壓偏差越大,系統(tǒng)的壓力波動(dòng)也越大。
(2)溢流閥壓力振擺它是溢流閥在系統(tǒng)較大額定流量和較大壓力下工作時(shí),所控制的壓力變動(dòng)。一般應(yīng)在±1~±3kgf/cm2左右。
(3)溢流閥卸載壓力當(dāng)系統(tǒng)的全部流量從溢流閥卸荷時(shí),閥的壓力損失為卸載壓力,卸載壓力越小越好。
(4)溢流閥動(dòng)態(tài)指標(biāo)溢流閥調(diào)整好以后,從開(kāi)始工作到穩(wěn)定工作一段的很短的過(guò)渡時(shí)間內(nèi),被控制的油壓首先以衰減振蕩的形式圍繞所調(diào)定的工作壓力值上下波動(dòng),然后才變?yōu)榉(wěn)壓溢流狀態(tài),當(dāng)工作機(jī)構(gòu)受沖擊載荷而系統(tǒng)壓力突然升高時(shí),會(huì)出現(xiàn)壓力峰值。峰值壓力與調(diào)定壓力的差值稱為壓力超調(diào)量。超調(diào)量與調(diào)定壓力之比稱為超調(diào)值。超調(diào)值越小越好,高壓溢流閥超調(diào)值一般小于20%,中、低壓溢流閥一般小于50%,另外,它的振擺次數(shù)和過(guò)渡過(guò)程時(shí)間也愈小愈好。
溢流閥的壓力等級(jí)要與系統(tǒng)所需要的壓力相適應(yīng),以確保較好的分辨率。 系統(tǒng)需要調(diào)節(jié)的較高壓力是180bar,則溢流閥的壓力等級(jí)應(yīng)該是210左右 .不應(yīng)該是315bar等太高的等級(jí)。原則是盡量使溢流閥的較高控制壓力略大于系統(tǒng)所需要的較高壓力。
DBDS10P18/315 10通徑板式安裝溢流閥
DB 型壓力閥是一種先導(dǎo)式溢流閥。用于限制工作壓力。
這些溢流閥 (DB) 主要由帶主閥心 (3) 的主閥 (1) 以及帶壓力調(diào)節(jié)元件的先導(dǎo)控制閥 (2) 組成。
施加在通道 P 中的壓力作用于主閥芯 (3)。同時(shí),該壓力通過(guò)配有噴嘴 (4) 和 (5) 的控制油路 (6) 和 (7) 施加于主閥芯 (3) 的彈簧負(fù)載側(cè)和先導(dǎo)控制閥 (2) 中的滾珠 (8)。如果通道 P 中的壓力超過(guò)彈簧 (9) 上設(shè)定的值,則滾珠 (8) 將背向彈簧 (9) 打開(kāi)。相應(yīng)的信號(hào)通過(guò)控制油路 (10) 和 (6) 從通道 P 由內(nèi)部傳出。此時(shí)主閥芯 (3) 彈簧負(fù)載側(cè)的液壓油通過(guò)控制油路 (7)、噴嘴孔 (11) 和滾珠 (8) 流入彈簧腔 (12)。從此處,液壓油通過(guò)控制油路 (13) 從內(nèi)部流入油箱(對(duì)于型號(hào) DB …),或通過(guò)控制油路 (14) 從外部流入油箱(對(duì)于型號(hào) DB …Y)。噴嘴 (4) 和 (5) 會(huì)導(dǎo)致主閥芯 (3) 出現(xiàn)壓降,從而使通道 P 到通道 T 的連接打開(kāi),F(xiàn)在,液壓油從通道 P 流到通道 T,同時(shí)維持設(shè)定的工作壓力。
溢流閥可通過(guò)油口“X”(15) 卸載或切換為另一壓力(第二個(gè)壓力等級(jí))。
DBDS10P18/315 10通徑板式安裝溢流閥
力士樂(lè)溢流閥DB,力士樂(lè)溢流閥DBW,先導(dǎo)式溢流閥,溢流閥
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博世力士樂(lè)REXROTH溢流閥DBDS10P18/315在液壓傳動(dòng)系統(tǒng)中,控制油液壓力高低的液壓閥稱之為壓力控制閥,簡(jiǎn)稱壓力閥。這類閥的共同點(diǎn)是利用作用在閥芯上的液壓力和彈簧力相平衡的原理工作的。
一、溢流閥的基本結(jié)構(gòu)及其工作原理
溢流閥的主要作用是對(duì)液壓系統(tǒng)定壓或進(jìn)行安全保護(hù)。
(一)溢流閥的作用和性能要求
1.溢流閥的作用
在液壓系統(tǒng)中用來(lái)維持定壓是溢流閥的主要用途。它常用于節(jié)流調(diào)速系統(tǒng)中,和流量控制閥配合使用,調(diào)節(jié)進(jìn)入系統(tǒng)的流量,并保持系統(tǒng)的壓力基本恒定。用于過(guò)載保護(hù)的溢流閥一般稱為安全閥。
2.液壓系統(tǒng)對(duì)溢流閥的性能要求
(1)定壓精度高
(2)靈敏度要高
(3)工作要平穩(wěn)且無(wú)振動(dòng)和噪聲
(4)當(dāng)閥關(guān)閉時(shí)密封要好,泄漏要小。
(二)溢流閥的結(jié)構(gòu)和工作原理
常用的溢流閥按其結(jié)構(gòu)形式和基本動(dòng)作方式可歸結(jié)為直動(dòng)式和先導(dǎo)式兩種。
1.直動(dòng)式溢流閥
直動(dòng)式溢流閥是依靠系統(tǒng)中的壓力油直接作用在閥芯上與彈簧力等相平衡,以控制閥芯的啟閉動(dòng)作,溢流閥是利用被控壓力作為信號(hào)來(lái)改變彈簧的壓縮量,從而改變閥口的通流面積和系統(tǒng)的溢流量來(lái)達(dá)到定壓目的的。當(dāng)系統(tǒng)壓力升高時(shí),閥芯上升,閥口通流面積增加,溢流量加大,進(jìn)而使系統(tǒng)壓力下降。溢流閥內(nèi)部通過(guò)閥芯的平衡和運(yùn)動(dòng)構(gòu)成的這種負(fù)反饋?zhàn)饔檬瞧涠▔鹤饔玫幕驹,也是所有定壓閥的基本工作原理。
2.先導(dǎo)式溢流閥
圖-19所示為先導(dǎo)式溢流閥的結(jié)構(gòu)示意圖,由于先導(dǎo)閥芯一般為錐閥,受壓面積較小,所以用一個(gè)剛度不太大的彈簧即可調(diào)整較高的開(kāi)啟壓力,用螺釘調(diào)節(jié)導(dǎo)閥彈簧的預(yù)緊力,就可調(diào)節(jié)溢流閥的溢流閥壓力。
先導(dǎo)式溢流閥有一個(gè)遠(yuǎn)程控制口K,如果將K口用油管接到另一個(gè)遠(yuǎn)程調(diào)壓閥(遠(yuǎn)程調(diào)壓閥的結(jié)構(gòu)和溢流閥的先導(dǎo)控制部分一樣),調(diào)節(jié)遠(yuǎn)程調(diào)壓閥的彈簧力,即可調(diào)節(jié)溢流閥主閥芯上端的液壓力,從而對(duì)溢流閥的溢流壓力實(shí)現(xiàn)遠(yuǎn)程調(diào)壓。但是,遠(yuǎn)程調(diào)壓閥所能調(diào)節(jié)的較高壓力不得超過(guò)溢流閥本身導(dǎo)閥的調(diào)整壓力。當(dāng)遠(yuǎn)程控制口K通過(guò)二位二通閥接通油箱時(shí),主閥芯上端的壓力接近于零,主閥芯上移到較高位置.閥口開(kāi)得很大。由于主閥彈簧較軟,這時(shí)溢流閥p口處壓力很低,系統(tǒng)的油在低壓下通過(guò)溢流閥流回油箱,實(shí)現(xiàn)卸荷。
(三)溢流閥的性能
溢流閥的性能包括溢流閥的靜態(tài)性能和動(dòng)態(tài)性能。
1.靜態(tài)性能
(1)壓力調(diào)節(jié)范圍
壓力調(diào)節(jié)范圍是指調(diào)壓彈簧在規(guī)定的范圍內(nèi)調(diào)節(jié)時(shí),系統(tǒng)壓力能平穩(wěn)地上升或下降,且壓力無(wú)突跳及遲滯現(xiàn)象時(shí)的較大和較小調(diào)定壓力。溢流閥的較大允許流量為其額定流量,在額定流量下工作時(shí)溢流閥應(yīng)無(wú)噪聲、溢流閥的較小穩(wěn)定流量取決于它的壓力平穩(wěn)性要求,一般規(guī)定為額定流量的15%。
(2)啟閉特性
啟閉特性是指溢流閥在穩(wěn)態(tài)情況下從開(kāi)啟后到閉合的過(guò)程中,被控壓力與通過(guò)溢流閥的溢流量之間的關(guān)系。它是衡量溢流閥定壓精度的一個(gè)重要指標(biāo),一般用溢流閥處于額定流量、調(diào)定壓力ps時(shí),開(kāi)始溢流的開(kāi)啟壓力pk及停止溢流的閉合壓力pB(yǎng)分別與ps的百分比來(lái)衡量,前者稱為開(kāi)啟比,后者稱為閉合比。
(3)卸荷壓力
當(dāng)溢流閥的遠(yuǎn)程控制口及與油箱相連時(shí),額定流量下的壓力損失稱為卸荷壓力。
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R900409898 ZDB6VP2-4X/315V
R900409896 ZDB6VB2-4X/315V
R900409893 ZDB6VA2-4X/315V
R900409889 ZDB6VA2-4X/100V
R900409886 ZDB6VA2-4X/200V
R900409854 ZDB6VB2-4X/200V
R900409847 ZDB6VP2-4X/50V
R900409844 ZDB6VP2-4X/200V
R900406615 ZDB6VA2-4X/50V
811109141 ZDBY6DB2-1X/315V/60
811109137 ZDBY6DA2-1X/315V/60
811109136 ZDBY6DA2-1X/160V/60
811109135 ZDBY6DA2-1X/80V/60
811109133 ZDBY6DP2-1X/315V/60
811109132 ZDBY6DP2-1X/160V/60
811104121 ZDBT-XA2-1X/315
811104119 ZDBT-XA8-1X/315
811104118 ZDBT-XA8-1X/160
811104113 ZDBT-XP2-1X/315
811104112 ZDBT-XP2-1X/160
811104110 ZDBT-XP8-1X/160
博世力士樂(lè)REXROTH溢流閥DBDS10P18/315先導(dǎo)式溢流閥用于調(diào)節(jié)主閥上腔的液壓力。主閥芯在其上腔液壓作用力和彈簧力的共同作用下與下腔液壓作用力相平衡。當(dāng)導(dǎo)閥前腔液壓作用力低于其調(diào)定彈簧力時(shí),導(dǎo)閥和主閥閥口均處于關(guān)閉狀態(tài),溢流口無(wú)液體流出。當(dāng)導(dǎo)閥前腔液壓作用力超過(guò)其調(diào)定彈簧力時(shí),導(dǎo)閥開(kāi)啟,此時(shí)阻尼孔中有液體流動(dòng),主閥上下腔產(chǎn)生壓力差,若此壓差對(duì)主閥芯所產(chǎn)生的作用力小于主閥彈簧力,則主閥口仍處于關(guān)閉狀態(tài);若此壓差對(duì)主閥芯所產(chǎn)生的作用力大于主閥彈簧力,就會(huì)使主閥開(kāi)啟并溢流。主閥彈簧力隨其開(kāi)口量的加大而加大,直至與主閥芯上的液壓作用力相平衡。