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90R100KP其他節(jié)流調(diào)速回路的特點

2022-11-17 閱讀次數(shù):

?調(diào)速閥的節(jié)流調(diào)速回路特點 1 在負載變化較大,v穩(wěn)定性要求較高的場合,則用調(diào)速閥替代節(jié)流閥,當△P>△P min,qV不隨△P而變化,所以速度剛性明顯優(yōu)于節(jié)流閥調(diào)速 2 雖解決了速度穩(wěn)定性問題,但因既有△P溢,又有△P節(jié),還有△P減,所以,△P更大,一般用于P較小,但F變化較大而v穩(wěn)定性要求較高的場合。

容積調(diào)速回路特點 ∵節(jié)流調(diào)速回路效率低、發(fā)熱大,只適用于小功率場合 ∴而容積調(diào)速回路,因無節(jié)流損失或溢流損失 故效率高,發(fā)熱小,一般用于大功率場合 容積調(diào)速回路分類 按油路循環(huán)方式分為 開式和閉式 按所用執(zhí)行元件不同分為泵—缸式 和泵—馬達式 變量泵和定量電機容積調(diào)速回路的工作特點 ①     nM=qP/VM ②∵  VM=定值 ∴  調(diào)節(jié)qP即可改變nM ② 若不計損失,在調(diào)速范圍內(nèi), ∴ 稱恒轉(zhuǎn)矩容積調(diào)速 定量泵-變量電機容積調(diào)速回路的工作特點 nM=qP/VM ∵  qP=定值 ∴  調(diào)節(jié)VM即可改變nM 定量泵 ∵  nM與VM成反比 TM與VM成正比 ∴  VM↑,nM↓,TM↑; VM↓,nM↑,TM↓, 以致帶不動負載,使馬達“自鎖”。

90R100KP其他節(jié)流調(diào)速回路的特點(圖1)

故  這種回路很少單獨使用 變量泵-變量電機容積調(diào)速回路工作原理 第一段:先將VM調(diào)至最大并固定,然后將VP由小→大,分兩段調(diào)節(jié)就,nM從0 ↑nM’(變—定) 第二段:將VP固定至最大,VM由大→小,nM從nM’↑nMmax(定—變) ∴調(diào)速范圍大,λ可達100。

變量泵-變量電機容積調(diào)速回路的特點 ∵ nM低時TM大,nM高時TM小 ∴ 正好符合大部分機械要求 故 多用于機床主運動、紡織機械、礦山機械 容積節(jié)流調(diào)速回路 ∵  容積調(diào)速回路雖然效率高,發(fā)熱小,但仍存在速度負載特性較軟的問題(主要由于泄漏所引起)。

∴ 常用于低速、穩(wěn)定性要求高的場合(如機床進給系統(tǒng)) 特點 1 qP自動與流量閥調(diào)節(jié)相吻合,無△P溢,η高 2 進入執(zhí)行元件的q與F變化無關,且自動補償泄漏,速度穩(wěn)定性好 3 因回路有節(jié)流損失,所以η<η容 4 便于實現(xiàn)快進—工進—快退工作循環(huán) 限壓式變量泵和調(diào)速閥調(diào)速回路工作原理 聯(lián)合調(diào)速,v由調(diào)速閥調(diào)定,qP與q1自動適應。

qP>q1,pP↑,通過反饋,qp↓qP=q1 >v=c q P 0、5Mpa(中低壓) 若△P<過小,v穩(wěn)定性不好 限壓式變量泵和調(diào)速閥調(diào)速回路特點 ∵  本回路的pP為一定值 又∵  若負載變化大時,節(jié)流損失大,低速工作時,泄漏量大,系統(tǒng)效率降低 ∴  用于低速、輕載時間較長且變載的場合時,效率很低。

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