液壓泵是液壓系統(tǒng)的動(dòng)力元件，其功用是給液壓系統(tǒng)提供壓力油，從能量轉(zhuǎn)換角度講，它將是原動(dòng)機(jī)（如發(fā)動(dòng)機(jī)）輸出的機(jī)械能轉(zhuǎn)換為便于輸送的液體的壓力能。液壓馬達(dá)則屬于執(zhí)行元件，它能將輸入液體的壓力能轉(zhuǎn)換為輸出軸轉(zhuǎn)動(dòng)的機(jī)械能，用來拖動(dòng)負(fù)載做功。根據(jù)結(jié)構(gòu)形式，液壓泵與液壓馬達(dá)具體可分為齒輪式、葉片式、柱塞式等類型。
德國HM20-2X/250-H-K35現(xiàn)貨銷售

1.液壓泵壓力

液壓泵工作壓力是指泵（或馬達(dá)）在實(shí)際工作時(shí)輸出（或輸入）油液的壓力，由外負(fù)載決定。

額定壓力是指在正常工作條件下，按試驗(yàn)標(biāo)準(zhǔn)規(guī)定能連續(xù)運(yùn)轉(zhuǎn)的高壓力。其大小受壽命的限制，若超過額定壓力工作，泵（或馬達(dá)）的使用壽命將會(huì)比設(shè)計(jì)的壽命短。當(dāng)工作壓力大于額定壓力時(shí)稱超載。

德國HM20-2X/250-H-K35現(xiàn)貨銷售

2.轉(zhuǎn)速

工作轉(zhuǎn)速是指泵（或馬達(dá)）在工作時(shí)的實(shí)際轉(zhuǎn)動(dòng)速度。

額定轉(zhuǎn)速是指在額定壓力下，能連續(xù)長時(shí)間正常運(yùn)轉(zhuǎn)的高轉(zhuǎn)速。若泵超過額定轉(zhuǎn)速工作將會(huì)造成吸油不足，產(chǎn)生振動(dòng)和大的噪聲，零件會(huì)遭受氣蝕損傷，壽命降低。

低穩(wěn)定轉(zhuǎn)速是指馬達(dá)正常運(yùn)轉(zhuǎn)所允許的低轉(zhuǎn)速。在此轉(zhuǎn)速下，馬達(dá)不出現(xiàn)爬行現(xiàn)象。

3.排量、流量

排量是指泵（或馬達(dá)）每轉(zhuǎn)一周，由密封容腔幾何尺寸變化而得的排出（或輸入）液體的體積，常用單位是ml/r（毫升/轉(zhuǎn)）。排量可以通過調(diào)節(jié)發(fā)生變化的成為變量泵（或變量馬達(dá)），排量不能變化的成為定量泵（或定量馬達(dá)）。

實(shí)際流量是指泵（或馬達(dá)）工作時(shí)出口處（或進(jìn)口處）的流量。由于泵本身存在內(nèi)泄漏，其實(shí)際流量小于理論流量。由于馬達(dá)本身也存在內(nèi)泄漏，要實(shí)現(xiàn)使用轉(zhuǎn)速，為補(bǔ)償泄漏量，其輸入實(shí)際流量大于理論流量。
德國HM20-2X/250-H-K35現(xiàn)貨銷售

4.效率

容積效率，對液壓泵是指其實(shí)際流量與理論流量的比值。對液壓馬達(dá)是指其理論流量與實(shí)際流量的比值。

機(jī)械效率，對液壓泵是指其理論轉(zhuǎn)矩與實(shí)際輸入轉(zhuǎn)矩的比值。對液壓馬達(dá)其實(shí)際輸出的轉(zhuǎn)矩為理論轉(zhuǎn)矩克服摩擦力后的轉(zhuǎn)矩，因此其機(jī)械效率為實(shí)際輸出轉(zhuǎn)矩與理論轉(zhuǎn)矩的比值。

總效率是指泵（或馬達(dá)）的輸出功率與輸入功率的比值?？傂实扔谌莘e效率與機(jī)械效率的乘積。

葉片泵安裝要求

1.泵轉(zhuǎn)向改變，則其吸排方向也改變?nèi)~片泵都有規(guī)定的轉(zhuǎn)向，不允許反。因?yàn)檗D(zhuǎn)子葉槽有傾斜，葉片有倒角，葉片底部與排油腔通，配油盤上的節(jié)流槽和吸、排口是按既定轉(zhuǎn)向設(shè)計(jì)?？赡孓D(zhuǎn)的葉片泵專門設(shè)計(jì)。

2.葉片泵裝配配油盤與定子用定位銷正確定位，葉片、轉(zhuǎn)子、配油盤都不得裝反，定子內(nèi)表面吸入?yún)^(qū)部分易磨損，必要時(shí)可將其翻轉(zhuǎn)安裝，以使原吸入?yún)^(qū)變?yōu)榕懦鰠^(qū)而繼續(xù)使用。

3.拆裝 注意工作表面清潔，工作時(shí)油液應(yīng)很好過濾。

4. 葉片在葉槽中的間隙太大會(huì)使漏泄增加，太小則葉片不能自由伸縮，會(huì)導(dǎo)致工作失常。

5.葉片泵的軸向間隙 對ηv影響很大。

?1)小型泵-0.015～0.03mm

?2)中型泵-0.02～0.045mm

6.油液的溫度和粘度 一般不宜超過55℃，粘度要求在17～37mm2/s之間。粘度太大則吸油困難;粘度太小則漏泄嚴(yán)重。

葉片泵

PV7…A型直接控制變量葉片泵；

PV7…A型液壓泵是直接控制（手動(dòng)）的變量葉片泵。

公稱規(guī)格10到25，1X/2X系列；工作壓力100bar；

規(guī)格排量：10/14/20/25，流量；14.5/20/29/36L/min；

機(jī)型規(guī)格BG06/06/20/20-公稱規(guī)格NS10/14/20/25等于規(guī)格10/14/20/25；

PV7…A型直接控制變量葉片泵：在工作時(shí)擁有很短的控制時(shí)間，運(yùn)行時(shí)候噪聲低，泵的裝配和連接尺寸符合VDMA 24 560/1和ISO 3019/2標(biāo)準(zhǔn)；

PV7葉片泵擁有的工作效率，工作時(shí)效率高，可以長時(shí)間使用的壽命長，是一個(gè)可變排量泵；

PV7…A直接控制葉片泵：PV7…A型帶1X系列BS 06（10到29），和2X系列BS 20（20到29）；

PV7…A型葉片泵用于兩種BG和NS型機(jī)型規(guī)格與公稱規(guī)格；

06-10/06-14/20-20/20-25；

泵從軸端看所適用的旋轉(zhuǎn)方向是向右R順時(shí)針，兩種驅(qū)動(dòng)軸A圓柱形驅(qū)動(dòng)軸和E圓柱形驅(qū)動(dòng)軸帶通軸驅(qū)動(dòng)；油管連接01是進(jìn)，出油的連接；

葉片泵的密封元件用于NBR密封M，和FKM軸封K密封；

三種泵的調(diào)節(jié)元件：0調(diào)節(jié)螺釘標(biāo)準(zhǔn)型，3的一次帶可斷的可鎖旋鈕，3帶鎖的控制器；

PV7型變量葉片泵多種零排量壓力范圍：05/10/04/07/02/05/10/；

變量葉片泵PV7…A型直接控制：泵主要是由泵體，端蓋，轉(zhuǎn)子，葉片，定子環(huán)，壓縮彈簧，調(diào)節(jié)螺釘和配油盤等組成。

德國HM20-2X/250-H-K35現(xiàn)貨銷售兩腳站立位置及手臂姿勢。正常鋸切時(shí)，用右手滿握鋸柄，主要負(fù)責(zé)推拉運(yùn)動(dòng)和掌握方向，左手輕扶鋸弓前端，配合右手將鋸扶正并向下施加一定的壓力。推進(jìn)時(shí)，要對鋸條施加壓力，退出時(shí)，不要對鋸弓施加壓力，鋸身應(yīng)輕輕抬起，盡可能減少鋸齒與被鋸面的接觸，以減少對鋸齒的磨損，速度要比推進(jìn)時(shí)快些。每次推拉運(yùn)動(dòng)身體的動(dòng)作姿勢和幅度。鋸削的速度要均勻、平穩(wěn)、有節(jié)奏，快慢要適度。過快則容易使操作者很疲勞，并造成鋸條過熱，很快損壞。
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