WO2017049781A1 - Laminar flow element - Google Patents

Laminar flow element Download PDF

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Publication number
WO2017049781A1
WO2017049781A1 PCT/CN2015/098014 CN2015098014W WO2017049781A1 WO 2017049781 A1 WO2017049781 A1 WO 2017049781A1 CN 2015098014 W CN2015098014 W CN 2015098014W WO 2017049781 A1 WO2017049781 A1 WO 2017049781A1
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WIPO (PCT)
Prior art keywords
laminar flow
solid round
round bar
hollow cylinder
flow element
Prior art date
Application number
PCT/CN2015/098014
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French (fr)
Chinese (zh)
Inventor
王文东
王筱庐
张凯
王泽元
肖攀
唐晓晨
边陇峰
Original Assignee
西安若水电气设备有限公司
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Publication of WO2017049781A1 publication Critical patent/WO2017049781A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure

Definitions

  • the present invention relates to the field of flow measurement.
  • a laminar flow element is an element that converts the fluid state of a fluid into a laminar flow, and is mainly used in the field of flow measurement.
  • mainstream laminar flow elements are generally fabricated by capillary tubes, allowing fluid to flow through the capillary to form a laminar flow, and then clustering a plurality of capillary tubes to form a laminar flow element; or rolling the corrugated plate and the flat plate to allow fluid to flow through the corrugated plate
  • the gap between the plate and the plate forms a laminar flow.
  • the patent No. CN201220237073.9 discloses a capillary laminar flow element.
  • the cylindrical corrosion-resistant polymer material is embedded with a stainless steel thin tube to form a laminar flow element, specifically: the inner diameter of the stainless steel thin tube is less than 1 mm.
  • the corrosion-resistant polymer material is polytetrafluoroethylene, and the laminar flow element is pressed into the valve body to be interference-fitted with the valve body.
  • An object of the present invention is to provide a laminar flow element, which solves the problem that the existing laminar flow element is expensive, the processing is not easy, the laminar flow effect is unstable, and the applicable flow range is narrow.
  • a laminar flow element consisting of a hollow cylinder and a solid round bar, the solid cylindrical rod is closely arranged in the axial direction, the hollow cylinder and the solid round rod, the solid round rod and The solid round bars are fixed by an interference fit; the gap between the solid round bar and the hollow cylinder, the solid round bar and the solid round bar constitutes a laminar flow channel, and the fluid flows through the laminar flow channel to form a laminar flow.
  • the diameter of the solid round bar is less than or equal to 3 mm.
  • the ratio of the length to the diameter of the solid round bar is greater than or equal to 10:1.
  • the solid round bars are arranged in a row.
  • the present invention creatively solves the problems encountered with prior laminar flow flow laminar flow components.
  • the invention adopts a solid round bar instead of a capillary to form a laminar flow channel, and the manufacturing cost of the solid round bar is much lower than that of the capillary tube; the processing difficulty of the solid round bar is much lower than that of the capillary tube, and the processing precision is higher; the outer surface of the solid round bar is The smoothness can be smoother than the inner surface of the capillary, and the laminar flow formed is more stable and can accommodate a wider flow range.
  • FIG. 1 is a schematic structural view of a laminar flow element according to the present invention.
  • FIG. 2 is a schematic structural view of another laminar flow element of the present invention.
  • FIG. 3 is a schematic view showing another structure of a hollow cylinder according to the present invention.
  • the hollow cylinder 1 has a wall thickness of 5 mm, a length of 30 mm, and a square through hole size of 10*10 mm.
  • the material of the hollow cylinder 1 can be selected from stainless steel, aluminum alloy or ceramic.
  • a solid round bar 2 having a smooth surface, a diameter of 1 mm, and a length of 30 mm is closely arranged in the axial direction of the through hole in the hollow cylinder 1.
  • the arrangement of the solid round bars 2 in the hollow cylinders is arranged in a row.
  • the hollow cylinder 1 and the solid round rod 2, the solid round rods 2 are fixed to each other by an interference fit.
  • the hollow cylinder 1 and the solid round bar 2, and the gap between the solid round bars 2 constitute a laminar flow path 3.
  • the solid round bar 2 can be made of stainless steel, aluminum alloy or ceramic.
  • the laminar flow element is actually used, and the fluid forms a laminar flow through the laminar flow path 3.
  • Embodiment 2 The discharge method of the solid round bar 2 in the laminar flow element can also adopt another method. As shown in FIG. 2, the solid round bar 2 is closely arranged in the hollow cylinder 1 in a row, and the specific scheme refers to the embodiment. One. Compared with the first embodiment, the laminar flow formed by the laminar flow element is more stable.
  • the laminar flow element can also be fabricated by using a solid round rod 2 having a diameter of 3 mm.
  • the laminar flow element can be fabricated by using a solid round rod 2 having a diameter of 1 mm.
  • the laminar flow element formed by the laminar flow element has a reduced stability, and the adapted flow rate range is slightly decreased, but the manufacturing cost is lowered.
  • the through hole in the hollow cylinder 1 can be formed into other shapes as long as the placement of the solid round bar 2 can be restricted.
  • the specific embodiment refer to the first embodiment.
  • the laminar flow element designed by the present invention creatively constructs the laminar flow channel 3 using a solid round bar 2, the cost of the solid round bar 2 is much lower than that of the capillary tube; the solid round bar 2 is much less difficult to process than the capillary tube.
  • the processing precision is higher; the smoothness of the outer surface of the solid round bar 2 can be higher than the smoothness of the inner surface of the capillary tube, and the laminar flow formed is more stable.
  • the flow rate that can be achieved in the prior art is 20 to 50 times, and the flow range that can be achieved by the present invention can be 20 to 200 times.

Abstract

A laminar flow element consists of a hollow cylinder (1) and solid round rods (2). The solid round rods (2) are closely arranged inside the hollow cylinder (1); the hollow cylinder (1) is fixed together with the solid round rods (2) by means of interference fit, and the solid round rods (2) are fixed together by means of interference fit; gaps between the hollow cylinder (1) and the solid round rods (2) and gaps among the solid round rods (2) constitute laminar flow channels (3), wherein a fluid flowing through the laminar flow channels forms a laminar flow. The laminar flow element has low manufacturing costs, high stability in the formed laminar flow, and a wide applicable flow range.

Description

一种层流元件 技术领域  Laminar flow component
[0001] 本发明涉及流量测量领域。  The present invention relates to the field of flow measurement.
背景技术  Background technique
[0002] 层流元件是一种将流体的流态转化为层流的元件， 主要应用在流量测量领域。  [0002] A laminar flow element is an element that converts the fluid state of a fluid into a laminar flow, and is mainly used in the field of flow measurement.
[0003] 目前主流层流元件一般采用毛细管制作， 让流体流过毛细管形成层流， 再将若 干根毛细管集束形成层流元件； 或者采用波纹板和平板卷制而成， 让流体流过 波纹板和平板之间的间隙形成层流。 例如专利号为 CN201220237073.9的专利公 幵了一种毛细管式的层流元件， 采用圆柱体耐腐蚀性高分子材料中镶嵌不锈钢 细管构成层流元件， 具体为： 不锈钢细管内径 lmm以下， 耐腐蚀性高分子材料 为聚四氟乙烯， 层流元件压入阀体内部， 与阀体过盈配合。 [0003] At present, mainstream laminar flow elements are generally fabricated by capillary tubes, allowing fluid to flow through the capillary to form a laminar flow, and then clustering a plurality of capillary tubes to form a laminar flow element; or rolling the corrugated plate and the flat plate to allow fluid to flow through the corrugated plate The gap between the plate and the plate forms a laminar flow. For example, the patent No. CN201220237073.9 discloses a capillary laminar flow element. The cylindrical corrosion-resistant polymer material is embedded with a stainless steel thin tube to form a laminar flow element, specifically: the inner diameter of the stainless steel thin tube is less than 1 mm. The corrosion-resistant polymer material is polytetrafluoroethylene, and the laminar flow element is pressed into the valve body to be interference-fitted with the valve body.
技术问题  technical problem
[0004] 以上现有技术生产出来的层流元件生产成本高， 并且现有层流元件流道内表面 加工难度大， 粗糙度较高， 导致形成的层流不稳定， 适用的流量范围也较窄。 问题的解决方案  [0004] The laminar flow components produced by the above prior art have high production cost, and the inner surface of the flow path of the existing laminar flow component is difficult to process, the roughness is high, and the laminar flow formed is unstable, and the applicable flow range is also narrow. . Problem solution
技术解决方案  Technical solution
[0005] 本发明的目的是提供一种层流元件， 解决现有层流元件价格过高， 加工不易， 形成的层流效果不稳定， 适用的流量范围较窄的问题。  [0005] An object of the present invention is to provide a laminar flow element, which solves the problem that the existing laminar flow element is expensive, the processing is not easy, the laminar flow effect is unstable, and the applicable flow range is narrow.
[0006] 本发明是这样实现的： 一种层流元件， 由中空柱体和实心圆棒组成， 中空柱体 内沿轴向紧密排列实心圆棒， 中空柱体与实心圆棒， 实心圆棒与实心圆棒之间 通过过盈配合固定； 实心圆棒与中空柱体、 实心圆棒与实心圆棒之间的间隙构 成层流流道， 流体流经层流流道形成层流。 [0006] The present invention is realized as follows: A laminar flow element consisting of a hollow cylinder and a solid round bar, the solid cylindrical rod is closely arranged in the axial direction, the hollow cylinder and the solid round rod, the solid round rod and The solid round bars are fixed by an interference fit; the gap between the solid round bar and the hollow cylinder, the solid round bar and the solid round bar constitutes a laminar flow channel, and the fluid flows through the laminar flow channel to form a laminar flow.
[0007] 所述实心圆棒的直径小于等于 3mm。 [0007] The diameter of the solid round bar is less than or equal to 3 mm.
[0008] 所述实心圆棒的长度与直径的比值大于等于 10: 1。 [0008] The ratio of the length to the diameter of the solid round bar is greater than or equal to 10:1.
[0009] 所述实心圆棒的排列方式为顺排。 [0009] The solid round bars are arranged in a row.
[0010] 所述实心圆棒的排列方式为叉排。 发明的有益效果 [0010] The arrangement of the solid round bars is a fork row. Advantageous effects of the invention
有益效果  Beneficial effect
[0011] 本发明创造性地解决了现有层流流量计层流元件遇到的问题。 本发明采用实心 圆棒代替毛细管形成层流流道， 实心圆棒的制造成本要远远低于毛细管； 实心 圆棒的加工难度要远低于毛细管， 加工精度更高； 实心圆棒外表面的光滑度可 以比毛细管的内表面的光滑度更高， 形成的层流更稳定， 可以适应更广的流量 范围。  [0011] The present invention creatively solves the problems encountered with prior laminar flow flow laminar flow components. The invention adopts a solid round bar instead of a capillary to form a laminar flow channel, and the manufacturing cost of the solid round bar is much lower than that of the capillary tube; the processing difficulty of the solid round bar is much lower than that of the capillary tube, and the processing precision is higher; the outer surface of the solid round bar is The smoothness can be smoother than the inner surface of the capillary, and the laminar flow formed is more stable and can accommodate a wider flow range.
对附图的简要说明  Brief description of the drawing
附图说明  DRAWINGS
[0012] 图 1为本发明的一种层流元件结构示意图。  1 is a schematic structural view of a laminar flow element according to the present invention.
[0013] 图 2为本发明的另一种层流元件结构示意图。 2 is a schematic structural view of another laminar flow element of the present invention.
[0014] 图 3为本发明的另一种中空柱体结构示意图。 3 is a schematic view showing another structure of a hollow cylinder according to the present invention.
[0015] 图中： 1、 中空柱体， 2、 实心圆棒， 3、 层流流道。 [0015] In the figure: 1, hollow cylinder, 2, solid round bar, 3, laminar flow channel.
实施该发明的最佳实施例  BEST MODE FOR CARRYING OUT THE INVENTION
本发明的最佳实施方式  BEST MODE FOR CARRYING OUT THE INVENTION
[0016] 实施例一 [0016] Embodiment 1
[0017] 所述中空柱体 1的壁厚为 5mm， 长度为 30mm， 正方形通孔尺寸为 10*10mm。 中 空柱体 1的材料可选用选用不锈钢、 铝合金或陶瓷等材料。  [0017] The hollow cylinder 1 has a wall thickness of 5 mm, a length of 30 mm, and a square through hole size of 10*10 mm. The material of the hollow cylinder 1 can be selected from stainless steel, aluminum alloy or ceramic.
[0018] 将 100根表面光滑的， 直径为 lmm， 长度为 30mm的实心圆棒 2沿中空柱体 1内通 孔的轴向紧密排列。 实心圆棒 2在中空柱体内的排列方式为顺排排列。 中空柱体 1和实心圆棒 2， 实心圆棒 2相互之间通过过盈配合固定。 中空柱体 1和实心圆棒 2 ， 实心圆棒 2相互之间的间隙构成了层流流道 3。 实心圆棒 2可以选用不锈钢、 铝 合金或陶瓷等材料。  [0018] A solid round bar 2 having a smooth surface, a diameter of 1 mm, and a length of 30 mm is closely arranged in the axial direction of the through hole in the hollow cylinder 1. The arrangement of the solid round bars 2 in the hollow cylinders is arranged in a row. The hollow cylinder 1 and the solid round rod 2, the solid round rods 2 are fixed to each other by an interference fit. The hollow cylinder 1 and the solid round bar 2, and the gap between the solid round bars 2 constitute a laminar flow path 3. The solid round bar 2 can be made of stainless steel, aluminum alloy or ceramic.
[0019] 层流元件在实际使用吋， 流体经过层流流道 3形成层流。  [0019] The laminar flow element is actually used, and the fluid forms a laminar flow through the laminar flow path 3.
本发明的实施方式 Embodiments of the invention
[0020] 实施例二 [0021] 层流元件中实心圆棒 2的排放方式也可采用另一种方法， 如图 2所示， 将实心圆 棒 2在中空柱体 1中做叉排紧密排列， 具体方案参照实施例一。 本实施例与实施 例一相比， 层流元件形成的层流更加稳定。 [0020] Embodiment 2 [0021] The discharge method of the solid round bar 2 in the laminar flow element can also adopt another method. As shown in FIG. 2, the solid round bar 2 is closely arranged in the hollow cylinder 1 in a row, and the specific scheme refers to the embodiment. One. Compared with the first embodiment, the laminar flow formed by the laminar flow element is more stable.
[0022] 实施例三  [0022] Embodiment 3
[0023] 层流元件也可以采用直径 3mm的实心圆棒 2制作， 具体实施方案可以参考实施 例一采用直径 lmm的实心圆棒 2制作层流元件的做法。 本实施例同实施例一相比 ， 层流元件形成的层流稳定性下降， 适应的流量范围稍有下降， 但是制作成本 降低。  [0023] The laminar flow element can also be fabricated by using a solid round rod 2 having a diameter of 3 mm. For the specific embodiment, the laminar flow element can be fabricated by using a solid round rod 2 having a diameter of 1 mm. Compared with the first embodiment, the laminar flow element formed by the laminar flow element has a reduced stability, and the adapted flow rate range is slightly decreased, but the manufacturing cost is lowered.
[0024] 实施例四  [0024] Embodiment 4
[0025] 如图 3所示， 中空柱体 1内的通孔还可以制作成其他形状， 只要能够限制实心圆 棒 2的摆放即可， 具体方案参照实施例一。  As shown in FIG. 3, the through hole in the hollow cylinder 1 can be formed into other shapes as long as the placement of the solid round bar 2 can be restricted. For the specific embodiment, refer to the first embodiment.
工业实用性  Industrial applicability
[0026] 本发明设计的层流元件创造性地采用实心圆棒 2构造层流流道 3， 实心圆棒 2的 成本要远远低于毛细管； 实心圆棒 2的加工难度要远低于毛细管， 加工精度更高 ； 实心圆棒 2外表面的光滑度可以比毛细管的内表面的光滑度更高， 形成的层流 更稳。 现有技术中可以实现的流量范围为 20〜50倍， 采用本发明可以实现的流 量范围可以达到 20〜200倍。  The laminar flow element designed by the present invention creatively constructs the laminar flow channel 3 using a solid round bar 2, the cost of the solid round bar 2 is much lower than that of the capillary tube; the solid round bar 2 is much less difficult to process than the capillary tube. The processing precision is higher; the smoothness of the outer surface of the solid round bar 2 can be higher than the smoothness of the inner surface of the capillary tube, and the laminar flow formed is more stable. The flow rate that can be achieved in the prior art is 20 to 50 times, and the flow range that can be achieved by the present invention can be 20 to 200 times.
[0027] 以上例举仅仅是本发明具体实施方式的举例说明， 应当指出， 对于本技术领域 的普通技术人员来说， 在不脱离本发明原理的前提下所做出的无需创造性劳动 的改进都视为本发明的保护范围。  The above exemplifications are merely illustrative of specific embodiments of the present invention, and it should be noted that those skilled in the art can make improvements without creative work without departing from the principles of the present invention. It is considered as the scope of protection of the present invention.

Claims

权利要求书 Claim
一种层流元件， 其特征在于： 由中空柱体 （1) 和实心圆棒 （2) 组成 ， 中空柱体 （1) 内沿轴向紧密排列实心圆棒 （2) ， 中空柱体 （1) 与实心圆棒 （2) 、 实心圆棒 （2) 与实心圆棒 （2) 之间通过过盈配 合固定， 中空柱体 （1) 与实心圆棒 （2) 、 实心圆棒 （2) 与实心圆 棒 （2) 之间的间隙构成层流流道 （3) 。 A laminar flow element characterized by: a hollow cylinder (1) and a solid round rod (2), the hollow cylinder (1) is closely arranged in the axial direction of the solid round rod (2), the hollow cylinder (1) ) Fixed by an interference fit between the solid round bar (2), the solid round bar (2) and the solid round bar (2), the hollow cylinder (1) and the solid round bar (2), the solid round bar (2) The gap between the solid round bar (2) and the solid round bar (2) constitutes a laminar flow path (3).
如权利要求 1所述的层流元件， 其特征在于： 所述实心圆棒 （2) 的直 径小于等于 3mm。 The laminar flow element according to claim 1, wherein the solid round bar (2) has a diameter of 3 mm or less.
如权利要求 1所述的层流元件， 其特征在于： 所述实心圆棒 （2) 长度 与直径的比值大于等于 10: 1。 The laminar flow element according to claim 1, wherein: the ratio of the length to the diameter of the solid round bar (2) is greater than or equal to 10:1.
如权利要求 2所述的层流元件， 其特征在于： 所述实心圆棒 （2) 的排 列方式为顺排。 The laminar flow element according to claim 2, wherein the solid round bars (2) are arranged in a row.
如权利要求 2所述的层流元件， 其特征在于： 所述实心圆棒 （2) 的排 列方式为叉排。 The laminar flow element according to claim 2, wherein the solid round bars (2) are arranged in a row.
PCT/CN2015/098014 2015-09-23 2015-12-21 Laminar flow element WO2017049781A1 (en)

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105157764B (en) * 2015-09-23 2018-09-04 陕西易度仪器仪表有限公司 A kind of laminar flow element

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3838598A (en) * 1969-03-28 1974-10-01 Brunswick Corp Capillary flow meter
JPH0518799A (en) * 1991-07-11 1993-01-26 Stec Kk Laminar flow element and manufacture thereof
US6601460B1 (en) * 1998-06-10 2003-08-05 Peter Albert Materna Flowmeter based on pressure drop across parallel geometry using boundary layer flow including Reynolds numbers above the laminar range
CN1668896A (en) * 2002-07-19 2005-09-14 迅捷集团公司 Flow sensor
CN203132601U (en) * 2012-05-23 2013-08-14 黄冈力达实业有限公司 Laminar flow element
CN103398747A (en) * 2013-08-07 2013-11-20 陕西天仪智能仪表有限公司 Gas flowmeter and application method thereof
CN203732104U (en) * 2014-01-23 2014-07-23 合肥远智自动化科技有限公司 Laminar flow tube used for flow detection of high temperature and high pressure gas
CN104655198A (en) * 2013-11-15 2015-05-27 大连康赛谱科技发展有限公司 Laminar flow sensor
CN105091958A (en) * 2015-09-23 2015-11-25 西安若水电气设备有限公司 Flowmeter for laminar flow
CN105157764A (en) * 2015-09-23 2015-12-16 西安若水电气设备有限公司 Laminar flow element
CN205037929U (en) * 2015-09-23 2016-02-17 西安若水电气设备有限公司 Laminar flow element
CN205049188U (en) * 2015-09-23 2016-02-24 西安若水电气设备有限公司 Laminar flow flowmeter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02138827A (en) * 1989-04-22 1990-05-28 Stec Kk Mass flowmeter
JP4364334B2 (en) * 1999-02-01 2009-11-18 株式会社堀場エステック Mass flow meter flow rate detection mechanism
CN2569107Y (en) * 2002-09-20 2003-08-27 博益(天津)气动技术研究所有限公司 Novel liquid flow sensor
DE10317166A1 (en) * 2003-04-15 2004-11-04 Abb Research Ltd. Gas meter arrangement with improved flow geometry
US20080250854A1 (en) * 2007-04-12 2008-10-16 Junhua Ding Mass flow device using a flow equalizer for improving the output response

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3838598A (en) * 1969-03-28 1974-10-01 Brunswick Corp Capillary flow meter
JPH0518799A (en) * 1991-07-11 1993-01-26 Stec Kk Laminar flow element and manufacture thereof
US6601460B1 (en) * 1998-06-10 2003-08-05 Peter Albert Materna Flowmeter based on pressure drop across parallel geometry using boundary layer flow including Reynolds numbers above the laminar range
CN1668896A (en) * 2002-07-19 2005-09-14 迅捷集团公司 Flow sensor
CN203132601U (en) * 2012-05-23 2013-08-14 黄冈力达实业有限公司 Laminar flow element
CN103398747A (en) * 2013-08-07 2013-11-20 陕西天仪智能仪表有限公司 Gas flowmeter and application method thereof
CN104655198A (en) * 2013-11-15 2015-05-27 大连康赛谱科技发展有限公司 Laminar flow sensor
CN203732104U (en) * 2014-01-23 2014-07-23 合肥远智自动化科技有限公司 Laminar flow tube used for flow detection of high temperature and high pressure gas
CN105091958A (en) * 2015-09-23 2015-11-25 西安若水电气设备有限公司 Flowmeter for laminar flow
CN105157764A (en) * 2015-09-23 2015-12-16 西安若水电气设备有限公司 Laminar flow element
CN205037929U (en) * 2015-09-23 2016-02-17 西安若水电气设备有限公司 Laminar flow element
CN205049188U (en) * 2015-09-23 2016-02-24 西安若水电气设备有限公司 Laminar flow flowmeter

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