孔口和縫隙流量在液壓技術(shù)中占有很重要的地位，它涉及液壓元件的密封性，系統(tǒng)的容積效率，更為重要的是它是設(shè)計(jì)計(jì)算的基礎(chǔ)，因此：小孔雖?。ㄖ睆揭话阍?mm以內(nèi)），縫隙雖窄（寬度一般在0、1mm以下），但其作用卻不可等閑視之。
孔分類：薄壁孔l/d≤0·5,細(xì)長(zhǎng)小孔l/d>4、短孔0.5薄壁小孔流量壓力特性 取孔前通道斷面為1—1斷面，收縮斷面為Ⅱ——Ⅱ斷面，管道中心為基準(zhǔn)面，z1=z2，列伯努利方程如下：p1+ρα1v12/2=p2+ρα2v22/2+△pw∵v1105Cc=0.61∽0.63 Cv=0.97∽0.98 Cq=0.6∽0.62 液壓柱塞泵 結(jié)論：∵q∝√△p，與μ無(wú)關(guān)。
∴流過(guò)薄壁孔的流量不受油溫變化的影響短孔和細(xì)孔的流壓特性 短孔：q=CqAT√2△p/ρ 細(xì)長(zhǎng)孔：q=πd4△p/128μl=πd2△p/32μl=CA△p 結(jié)論：∵q∝△p反比于μ ∴流量受油溫變化影響較大（T↑μ↓q↑） 流量通用方程 ∵薄壁孔：q=CqAT√2△p/ρ=Cq√2/ρAT√△p 短孔：q=CqAT√2△p/ρ=Cq√2/ρAT√△p 細(xì)長(zhǎng)孔：q=πd4△p/128μl=1/32μlπd4/4△p 液壓柱塞泵∴流量通用方程：q=CAT△pф液體流經(jīng)間隙的流量-壓力特性 常見(jiàn)縫隙:平面縫隙、環(huán)狀縫隙 縫隙流動(dòng)狀況：壓差流動(dòng)、剪切流動(dòng) 壓差流固定平板間隙流壓力特性 例：設(shè)縫隙度高為δ，寬度b,度為l,兩端壓力 為p1、p2其壓差為ΔP，從縫隙中取一微小六面體，左右兩端所受壓力為p和p+dp，上下兩側(cè)面所受摩擦切應(yīng)力為τ+dτ和τ，則在水平方向受力平衡方程為： pbdy+(τ+dτ)bdx=(p+dp)bdy+τbdx，整理后得：dτ/dy=dp/dx ∵τ=μ·du/dy ∴液壓柱塞泵d2u/dy2=1/μ·dp/dx 上式對(duì)y兩次積分得：u=dp/dx·y2/2μ+C1y+C2 由邊界條件：當(dāng)y=0,u=0y=δ,u=u0 則有：C1=-δdp/dx/2μ,C2=0 此外，在縫隙液流中，壓力沿x方向變化率dp/dx是一常數(shù)，有:dp/dx=p2-p1/l=-(p1-p2)/l=-△p/l u=(δ-y)y·△p/2μl 故q=∫0hubdy=b∫0h△p·(δ-y)ydy/2μl =bδ3△p/12μl結(jié)論：在壓差的作用下，固定平行平板間隙的流量與間隙高度成正比液壓柱塞泵，說(shuō)明液壓元件中間隙的大小對(duì)其泄漏影響很大。
剪切流動(dòng)時(shí)相對(duì)運(yùn)動(dòng)平板間隙流壓特性：q=vbδ/2 壓差與剪切流動(dòng)時(shí)：q=bδ3△p/12μl±vbδ/2 剪切與壓差流動(dòng)方向一致時(shí)，取正號(hào)；剪切與壓差流動(dòng)方向相反時(shí)，取負(fù)號(hào) 流量壓力特性流經(jīng)環(huán)形縫隙的液體 環(huán)形縫隙：液壓缸缸筒與活，閥芯與閥孔 分類：同心、偏心 同心環(huán)形縫隙流量 例：設(shè)圓柱體直徑為D，縫隙厚度為δ，縫隙長(zhǎng)度為l,若沿圓周展開(kāi)，相當(dāng)于平行平板縫隙，b=πD，所以q=πDδ3△p/12μl±πDδv/2，當(dāng)相對(duì)速度V=0時(shí)，其液壓柱塞泵流量公式為：q=πDδ3·△p/12μl設(shè)偏心距為e,則：q=πDδ3△p(l+1.5ε2)/12μl±πDδv/2ε—相對(duì)偏心率ε=e/δ，當(dāng)內(nèi)外圓表面沒(méi)有相對(duì)運(yùn)動(dòng)時(shí)：q=πDδ3△p(l+1.5ε2)/12μl 結(jié)論：1）ε=1時(shí)q偏=2.5q同 2）ε=0時(shí)即同心圓環(huán)縫隙 3）∵q與ε2成正比，ε↑q↑ ∴應(yīng)盡量做成同心，以減小泄漏量。
90-L-055-KA-1-AB-60-L-3-C6-C-03-GBA-38-38-24 90L055KA1AB60L3C6C03GBA383824 90-L-055-KA-1液壓柱塞泵-AB-60-L-3-S1-D-03-GBA-42-42-24 90L055KA1AB60L3S1D03GBA424224 90-L-055-KA-1-AB-60-P-3-T1-C-03-GBA-35-14-24 90L055KA1AB60P3T1C03GBA351424 90-L-055-KA-1-AB-60-P-4-C6-C-03-GBA-35-35-24 90L055KA1AB60P4C6C03GBA353524 90-L-055-KA-1-AB-60-P-4-S1-C-03-GBA-29-29-24 90L055KA1AB60P4S1C0液壓柱塞泵3GBA292924 90-L-055-KA-1-AB-60-R-3-C6-C-04-GBA-35-35-24 90L055KA1AB60R3C6C04GBA353524 90-L-055-KA-1-AB-60-R-4-C6-D-03-GBA-42-35-24 90L055KA1AB60R4C6D03GBA423524 90-L-055-KA-1-AB-60-R-4-S1-C-03-GBA-29-29-24 90L055KA1AB60R4S1C03GBA292924 90-L-055-KA-1-AB-60-R-4-S1-C-03-液壓柱塞泵GBA-35-35-24 90L055KA1AB60R4S1C03GBA353524 90-L-055-KA-1-AB-60-S-3-S1-C-03-GBA-35-35-24 90L055KA1AB60S3S1C03GBA353524 90-L-055-KA-1-AB-60-S-3-S1-C-03-GBA-42-42-24 90L055KA1AB60S3S1C03GBA424224 90-L-055-KA-1-AB-60-S-3-S1-C-04-GBA-35-35-24 90L055KA1AB60S3S1C04GBA353524 液壓柱塞泵90-L-055-KA-1-AB-80-P-4-S1-B-03-GBA-26-26-24 90L055KA1AB80P4S1B03GBA262624 90-L-055-KA-1-BB-60-L-3-S1-C-03-GBA-42-42-24 90L055KA1BB60L3S1C03GBA424224 90-L-055-KA-1-BB-60-P-3-C6-D-03-GBA-29-29-24 90L055KA1BB60P3C6D03GBA292924 90-L-055-KA-1-BB-60-R-3-T1-C-03-GBA-38-38-24 90L055液壓柱塞泵KA1BB60R3T1C03GBA383824 90-L-055-KA-1-BB-60-S-3-C6-C-03-GBA-42-42-20 90L055KA1BB60S3C6C03GBA424220 90-L-055-KA-1-BC-60-P-3-S1-C-03-GBA-35-35-24 90L055KA1BC60P3S1C03GBA353524 90-L-055-KA-1-BC-60-P-3-S1-C-03-GBA-42-42-24 90L055KA1BC60P3S1C03GBA424224 90-L-055-KA-1-BC-60液壓柱塞泵-P-4-S1-C-03-GBA-29-29-24 90L055KA1BC60P4S1C03GBA292924 90-L-055-KA-1-BC-60-P-4-S1-C-03-GBA-42-42-24 90L055KA1BC60P4S1C03GBA424224 90-L-055-KA-1-BC-60-R-3-C6-D-02-GBA-42-42-24 90L055KA1BC60R3C6D02GBA424224 90-L-055-KA-1-BC-60-R-3-S1-C-00-GBA-35-35-24 90L055KA1BC60R3S1C00GBA35液壓柱塞泵3524 90-L-055-KA-1-BC-60-R-3-S1-C-03-GBA-35-35-24 90L055KA1BC60R3S1C03GBA353524 90-L-055-KA-1-BC-60-S-3-C6-C-03-GBA-42-42-20 90L055KA1BC60S3C6C03GBA424220 90-L-055-KA-1-BC-60-S-3-C6-D-03-GBA-35-35-20 90L055KA1BC60S3C6D03GBA353520 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90-L-055-KA-1-CD-60-P-4-S1-C-03-GBA-35-35-24 90L055KA1CD60P4S1C03GBA353524 90-L-055-KA-1-CD-60-R-3-C6-C-00-GBA-42-42-24 90L055KA1CD60R3C6C00GBA424224 液壓柱塞泵 90-L-055-KA-1-CD-60-R-3-S1-C-03-GBA-29-29-24 90L055KA1CD60R3S1C03GBA292924 90-L-055-KA-1-CD-60-S-3-C6-C-03-GBA-35-35-24 90L055KA1CD60S3C6C03GBA353524 90-L-055-KA-1-CD-60-S-3-C6-C-04-GBA-35-35-24 90L055KA1CD60S3C6C04GBA353524 90-L-055-KA-1-CD-60-S-3-S1-C-03-GBA-35-35-24液壓柱塞泵 90L055KA1CD60S3S1C03GBA353524 90-L-055-KA-1-CD-60-S-3-S1-C-03-GBA-38-38-20 90L055KA1CD60S3S1C03GBA383820 90-L-055-KA-1-CD-60-S-3-S1-C-03-GBA-38-38-24 90L055KA1CD60S3S1C03GBA383824 90-L-055-KA-1-CD-60-S-3-S1-C-03-GBA-42-42-24 90L055KA1CD60S3S1C03GBA424224 90-L-055-KA-液壓柱塞泵1-CD-60-S-4-S1-D-03-GBA-35-35-24 90L055KA1CD60S4S1D03GBA353524 90-L-055-KA-1-CD-80-L-3-S1-C-03-GBA-32-32-24 90L055KA1CD80L3S1C03GBA323224 90-L-055-KA-1-CD-80-L-3-S1-D-03-GBA-14-14-24 90L055KA1CD80L3S1D03GBA141424 90-L-055-KA-1-CD-80-P-3-C6-C-00-GBA-42-42-24 90L055KA1CD80P3C6C液壓柱塞泵00GBA424224 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90-L-055-KA-1-CD-80-S-3-S1-C-03-GBA-38-38-20 90L055KA1CD80S3S1C03GBA383820 90-L-055-KA-1-CD-8液壓柱塞泵0-S-3-S1-C-04-GBA-38-38-28 90L055KA1CD80S3S1C04GBA383828 90-L-055-KA-1-NN-60-L-3-S1-C-03-GBA-29-29-20 90L055KA1NN60L3S1C03GBA292920 90-L-055-KA-1-NN-60-L-3-S1-C-03-GBA-29-29-24 90L055KA1NN60L3S1C03GBA292924 90-L-055-KA-1-NN-60-L-3-S1-C-03-GBA-35-35-20 90L055KA1NN60L3S1C03GBA3液壓柱塞泵53520 90-L-055-KA-1-NN-60-L-3-S1-C-03-GBA-35-35-24 90L055KA1NN60L3S1C03GBA353524 90-L-055-KA-1-NN-60-L-3-S1-D-03-GBA-35-35-20 90L055KA1NN60L3S1D03GBA353520 90-L-055-KA-1-NN-60-L-4-S1-C-03-GBA-23-23-24 90L055KA1NN60L4S1C03GBA232324 90-L-055-KA-1-NN-60-P-3-S1-C-00-GBA-2液壓柱塞泵3-23-20 90L055KA1NN60P3S1C00GBA232320 90-L-055-KA-1-NN-60-P-3-S1-C-03-GBA-42-42-24 90L055KA1NN60P3S1C03GBA424224 90-L-055-KA-1-NN-60-P-3-S1-D-03-GBA-35-35-24 90L055KA1NN60P3S1D03GBA353524 90-L-055-KA-1-NN-60-R-3-C6-D-04-GBA-17-17-24 90L055KA1NN60R3C6D04GBA171724 90-L-液壓柱塞泵055-KA-1-NN-60-R-3-S1-C-00-GBA-35-35-24 90L055KA1NN60R3S1C00GBA353524 90-L-055-KA-1-NN-60-R-3-S1-C-00-GBA-42-42-24 90L055KA1NN60R3S1C00GBA424224 90-L-055-KA-1-NN-60-R-3-S1-C-03-GBA-35-35-24 90L055KA1NN60R3S1C03GBA353524 90-L-055-KA-1-NN-60-R-3-S1-C-05-GBA-42-42-24 90L055KA1NN液壓柱塞泵60R3S1C05GBA424224 90-L-055-KA-1-NN-60-R-4-S1-C-03-GBA-29-29-24 90L055KA1NN60R4S1C03GBA292924 90-L-055-KA-1-NN-60-S-3-C6-C-02-GBA-35-35-24 90L055KA1NN60S3C6C02GBA353524 90-L-055-KA-1-NN-60-S-3-C6-C-03-GBA-32-35-24 90L055KA1NN60S3C6C03GBA323524 90-L-055-KA-1-NN-60-S-3-液壓柱塞泵S1-B-03-GBA-32-20-24 90L055KA1NN60S3S1B03GBA322024 90-L-055-KA-1-NN-60-S-3-S1-C-03-GBA-35-35-24 90L055KA1NN60S3S1C03GBA353524 90-L-055-KA-1-NN-60-S-3-S1-C-03-GBA-38-38-20 90L055KA1NN60S3S1C03GBA383820 90-L-055-KA-1-NN-60-S-3-S1-C-03-GBA-38-38-24 90L055KA1NN60S3S1C03GBA383824 液壓柱塞泵 90-L-055-KA-1-NN-60-S-4-C6-C-03-GBA-32-32-24 90L055KA1NN60S4C6C03GBA323224 90-L-055-KA-1-NN-61-P-3-S1-C-00-GBA-35-35-24 90L055KA1NN61P3S1C00GBA353524。
