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德國克拉克KRACHT流量計(jì)誤差特性分析解讀
點(diǎn)擊次數(shù):1417 更新時(shí)間:2021-09-09

德國克拉克KRACHT流量計(jì)誤差特性分析解讀

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德國KRACHT齒輪流量計(jì)的應(yīng)用從傳統(tǒng)的液壓油到印刷廠顏料,從齒輪機(jī)構(gòu)油脂到水基油漆,流量計(jì)可以測(cè)量所有這些介質(zhì)。功能強(qiáng)大的KRACHT分析電子裝置處理流量計(jì)提供的信號(hào),并地監(jiān)視、調(diào)節(jié)和控制各過程。例如在過程技術(shù)中用作計(jì)量和混合系統(tǒng)的微控制器或在試驗(yàn)臺(tái)技術(shù)中的不同應(yīng)用場(chǎng)合用作靈活的測(cè)量和記錄電子裝置。德國克拉克齒輪泵術(shù)語描述;SVC螺旋式流量計(jì)/VC齒輪流量計(jì)/TM透平流量計(jì)。

 

德國克拉克KRACHT流量計(jì)誤差特性分析解讀

對(duì)于任何一個(gè)流量測(cè)量值來說,必須包括兩部分內(nèi)容:一是流量測(cè)量值本身;二是它的誤差允許范圍.否則是不完整的.所以,對(duì)于任何一種流量計(jì),都必須了解它的誤差特性。


所謂誤差特性,就是流量計(jì)的誤差值與流量測(cè)量值之間的關(guān)系。討論誤差特性,就是討論和研究測(cè)量誤差值隨流量測(cè)量值變化而變化的趨勢(shì).


容積式流量計(jì)的測(cè)量誤差值E,可由指示值與真值之差與指示值之比表示.設(shè):V為通過流量計(jì)的流體體積真值;I為流量計(jì)指示值,則誤差值E可表示為


E= (I - V) / I (2-5)


將流體體積V與指示值I之間的關(guān)系式(2-3)代入,可得:


E=(1- v) / a (2-6)


容積式流量計(jì)的誤差特性僅與流量計(jì)內(nèi)部的計(jì)量空間體積v、儀表齒輪比常數(shù)a有關(guān).也就是說,從測(cè)量原理的角度來說,容積式流量計(jì)的測(cè)量誤差僅與流量計(jì)的幾何結(jié)構(gòu)有關(guān),而與流體性質(zhì)和流量值無關(guān),我們把這個(gè)誤差特性稱為容積式流量計(jì)的理想誤差特性.畫成曲線,是一條平行于橫軸的水平線、


然而,當(dāng)我們對(duì)容積式流量計(jì)進(jìn)行標(biāo)定,畫出實(shí)際誤差特性曲線時(shí),則較接近曲線2的形式.在小流量時(shí),誤差值急劇地向負(fù)方向傾斜;隨著流量增大,誤差值逐漸由負(fù)方向向正方向移動(dòng),并穩(wěn)定在某一定位上,誤差曲線平行于橫軸.流量繼續(xù)增加,誤差值又將向負(fù)方向偏移.實(shí)際誤差特性曲線所以呈現(xiàn)這種變化趨勢(shì),是因?yàn)樵谟谌莘e式流量計(jì)中存在著不可避免的漏流現(xiàn)象.所謂漏流,就是流體通過轉(zhuǎn)動(dòng)件與外殼之間的間隙直接從入口流向出口,沒有被計(jì)量.以下將討論考慮了漏流現(xiàn)象的誤差特性關(guān)系式.


假設(shè)在單位時(shí)間內(nèi)的流體漏流量用△g表示;通過流量計(jì)的流量為qv;通過流量計(jì)總的流體體積量為V;在這一段時(shí)間內(nèi)總的漏流的體積量為△V.這株△V可表示為


△V= △g * V / qv (2-7)


所以,當(dāng)存在漏流時(shí),轉(zhuǎn)子排出N個(gè)計(jì)量空間流體量時(shí),實(shí)際通過流量計(jì)的流體體積為


V=Nv+△V (2-8)


將式2-2,2-7代入式2-8,可得:


V= I v/ a+△g * V/ q v (2-9)


式(2-9)可整理成:


V= Iv / n (1 - △g / qv ) (2-10)


將式(2-10)代入誤差定義式(2-5),可得:


E=1-v / a (1- △g / qv) (2-11)


分析式2—11可見,由于計(jì)量空間體積v、齒輪比常數(shù)a均為定值,所以誤差E與流量之間的關(guān)系受單位時(shí)間漏流量△g影響.


若假定該容積式流量計(jì)的漏流量 △g是一恒定值,可利用式(2—11)討論其誤差曲線的變化趨勢(shì).


當(dāng)流量很小,在情況下,qr=△g,則式(2—11)中括號(hào)內(nèi)為0,誤差值E趨向負(fù)無窮大.


隨著流量qv增加,式(2—11)中括號(hào)內(nèi)數(shù)值逐漸增大,誤差值E也逐漸向正方向增加。


當(dāng)流量繼續(xù)增加,達(dá)到△g與qv相比顯得非常小,即△g/qv很接近0時(shí),式(2—11)轉(zhuǎn)變成式(2-6),誤差曲線趨向于理想誤差曲線.

 

KRACHT流量計(jì)現(xiàn)貨型號(hào):

 

VC 0,025 G2 P3 R2 SH

VC 0,025 K2 P3 R2 SH

VC 0,04 K1 F1 P2 SH

VC 0,04 K1 F1 P2 HH

VC 0,1 K1 E2 P2 SC

VC 0,1 K1 P1 P2 SH

VC 0,2 K1 F1 P2 SH

VC 0,2 K1 F1 P2 SM

VC 0,4 K1 P1 P2 VH

VC 0,4 K1 P1 P2 XH

VC 1 K1 F1 P2 SH

VC 1 K1 F1 P2 SC

VC 3 K1 P1 P2 SH

VC 3 K1 P1 P2 HH

VC 5 K1 F1 P2 SH

VC 5 K3 F1 P2 SH

VC 12 K1 F1 P4 SK /220

VC 16 K1 F1 P2 SH

VCA 0,04 K4 F3 R1 SH

VCA 0,1 K5 F3 R1 SH

VCA 0,2 U4 F4 R1 SH

VCA 2 M5 F4 R1 VV

VCA 2 M5 F4 R1 S5H /81

VCG 2 M1 F1 P2 SH

VCG 2 M1 F1 P2 XH

VCN 0,04 K2 F3 R1 SH

SVC 4 K3 F1 S2 SH

SVC 10 K3 F1 S2 SH

SVC 40 K1 F1 S2 SH

SVC 100 K1 F1 S2 SH

 

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