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WO2017049782A1 - 一种层流流量计 - Google Patents

一种层流流量计 Download PDF

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Publication number
WO2017049782A1
WO2017049782A1 PCT/CN2015/098015 CN2015098015W WO2017049782A1 WO 2017049782 A1 WO2017049782 A1 WO 2017049782A1 CN 2015098015 W CN2015098015 W CN 2015098015W WO 2017049782 A1 WO2017049782 A1 WO 2017049782A1
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WO
WIPO (PCT)
Prior art keywords
laminar flow
laminar
solid round
round bar
flow element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2015/098015
Other languages
English (en)
French (fr)
Inventor
张凯
王筱庐
王文东
王泽元
肖攀
唐晓晨
边陇峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xi'an Ruoshui Electrical Equipment Co Ltd
Original Assignee
Xi'an Ruoshui Electrical Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xi'an Ruoshui Electrical Equipment Co Ltd filed Critical Xi'an Ruoshui Electrical Equipment Co Ltd
Publication of WO2017049782A1 publication Critical patent/WO2017049782A1/zh
Anticipated expiration legal-status Critical
Priority to US18/126,000 priority Critical patent/US12007077B2/en
Ceased legal-status Critical Current

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Classifications

    • 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
    • G01F1/36—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 the pressure or differential pressure being created by the use of flow constriction

Definitions

  • the present invention relates to the field of flow measurement.
  • a laminar flowmeter is a differential pressure flowmeter composed of a laminar flow element and a differential pressure sensor.
  • the fluid flow is measured by measuring the differential pressure across the laminar flow element, characterized by a flow proportional to the differential pressure.
  • the laminar flow element used in the laminar flowmeter is generally made of a capillary tube, allowing a fluid to flow through the capillary to form a laminar flow, and then a plurality of capillary tubes are bundled to form a laminar flow element; or a corrugated plate and a flat plate are rolled, so that The fluid flows through the gap between the corrugated plate and the flat plate to form a laminar flow.
  • the invention patent of the application No. CN201310341942.1 discloses that a laminar flow body for a gas flow meter is rolled with a stainless steel double-layer sheet, one layer.
  • the other layer is a smooth flat plate with a thickness smaller than that of the corrugated board; or it is bundled with stainless steel capillary tube, the diameter of the capillary tube is l ⁇ 3mm, and the wall thickness is 0.05 ⁇ 0.15mm.
  • the laminar flow element produced by the prior art has high production cost, and the inner surface of the flow path of the existing laminar flow element is difficult to process, the roughness is high, the laminar flow formed is unstable, and the applicable flow range is also narrow. This results in a high price of the laminar flow meter, low measurement accuracy, and difficulty in further increasing the flow range.
  • An object of the present invention is to provide a laminar flowmeter that solves the problem that the existing laminar flowmeter is overpriced, and the measurement accuracy and flow rate range are difficult to be further improved.
  • the content of the invention is: a laminar flow meter, comprising an end cap, a main body, an adjustment cylinder, an upstream pressure tube, a gasket, a gauze, a differential pressure sensor, a laminar flow element, a downstream pressure tube,
  • the laminar flow element is composed of a hollow cylinder and a solid round bar, and both ends of the laminar flow element are sequentially provided with a gauze, a gasket and an adjustment cylinder.
  • the end cover is fixed at both ends of the main body, and the main body has two pressure guiding holes, which are respectively fixedly connected with the upstream pressure guiding tube and the downstream bow I pressure tube, and the upstream bow I pressure tube and the downstream bow I pressure tube respectively Fixed connection to both ends of the differential pressure sensor
  • the laminar flow element is fixed between the two pressure holes inside the main body. [0008]
  • the area of the gauze is larger than the area of the through hole on the hollow cylinder.
  • the diameter of the solid round bar is less than or equal to 3 mm, and the ratio of the length of the solid round bar to the diameter is greater than or equal to 10:1.
  • the solid round bars are arranged in a row.
  • the arrangement of the solid round bars is a fork row.
  • the present invention creatively solves the problems encountered in prior laminar flow meters and greatly reduces the production cost of laminar flow meters.
  • the invention adopts a solid round bar instead of a capillary to form a laminar flow channel, and the 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 smooth
  • the degree of smoothness can be higher than the inner surface of the capillary, the laminar flow formed is more stable, and the applicable flow range is wider.
  • the laminar flowmeter laminar flowmeter designed by the invention has lower production cost, higher measurement precision and adapts to a wider flow range.
  • 1 is a laminar flow meter of the present invention.
  • FIG. 4 is a schematic view showing another structure of a hollow cylinder according to the present invention.
  • the main body 2 adopts a hollow cylinder structure with a wall thickness of 25 mm and a length of 100 mm, and a square through hole having a size of 15*15 mm.
  • Two guiding holes are arranged in the axial direction of the main body 2, and communicate with the through holes in the main body 2, respectively on both sides of the laminar flow element 8, and the diameter of the holes is 3 mm.
  • the main body 2 can be made of stainless steel, aluminum alloy or plastic.
  • the upstream bow I pressure tube 4 and the downstream bow I pressure tube 9 are respectively fixed on the two pressure guiding holes, and the fixing manner may be screw connection or welding.
  • the upstream pressure pipe 4 and the downstream pressure pipe 9 can be made of stainless steel or the like.
  • the upstream bow I pressure tube 4 and the downstream bow I pressure tube 9 are respectively connected to the high pressure end and the low pressure end of the differential pressure sensor 7, and are fixed by screwing or welding.
  • the laminar flow element 8 is fixed in the through hole of the main body 2 between the two pressure guiding holes.
  • the laminar flow element 8 is composed of a hollow cylinder 10 and a solid round bar 11.
  • the hollow cylinder 10 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 10 can be selected from stainless steel, aluminum alloy or ceramics.
  • the arrangement of the solid round bars 11 in the hollow cylinder 10 is arranged in a row.
  • the solid round bar U can be made of stainless steel or the like.
  • the hollow cylinder 10 and the solid round bar 11, the solid round bars 11 are fixed to each other by an interference fit.
  • the hollow cylinder 10 and the solid round bar 11, the gap between the solid round bars 11 constitute a laminar flow path 12.
  • the gauze 6 is sized to completely cover the through holes in the hollow cylinder 10 and is slightly larger than the through holes in the hollow cylinder 10.
  • the gauze 6 is disposed at both ends of the laminar flow element 8.
  • the gauze 6 is used to define the axial displacement of the solid round bar in the laminar flow element 8.
  • the material of the gauze 6 can be selected from corrosion-resistant materials such as stainless steel or plastic.
  • the gasket 5 has a size of 15*15 mm and a thickness of lmm.
  • the center of the gasket 5 has a 10*10mm square through hole.
  • the material of the gasket 5 can be selected from corrosion-resistant materials such as stainless steel or plastic.
  • the adjustment cylinder 3 can adopt a hollow cylinder structure with a wall thickness of 5 mm and a length of 35 mm.
  • the size of the hole is 10*10 mm.
  • the adjustment cylinder 3 can also adopt a plurality of round bars having a diameter of 2 mm and a length of 35 mm, or two rectangular cylinders having a radial section of l*10 mm and a length of 35 mm.
  • the adjustment cylinder 3 only needs to satisfy the condition that the length between the end cover 1, the adjustment cylinder 3, the spacer 5, the gauze 6, and the laminar flow element 8 in the axial direction can generate an interference fit, and the laminar flow component can be ensured. 8 is fixed at the position inside the main body 2, and ensures that the solid round bar 11 does not cause displacement in the axial direction within the hollow cylinder 10.
  • the adjustment cylinder 3 can be made of stainless steel, aluminum alloy or ceramic.
  • the end cap 1 has a radial cross-sectional dimension of 40*40 mm and a length of 10 mm, and a central portion of the radial cross section of the end cap 1 has a through hole having a diameter of 15 mm and is provided with an externally threaded pipe joint of DN15.
  • the end cap 1 can be made of stainless steel, aluminum alloy or plastic.
  • the end cap 1, the adjusting cylinder 3, the spacer 5, the gauze 6, and the laminar flow element 8 are mounted on the main body 2, and the end cap 1, the main body 2, the adjusting cylinder 3, the spacer 5, and the layer are ensured.
  • the respective axes of the flow elements 8 are on the same straight line, and the specific installation manner is as follows:
  • the laminar flow element 8 is placed in the center of the through hole of the main body 2, so that the upstream pressure guiding tube 4 and the downstream pressure guiding tube 9 are located at the laminar flow element. 8 on both sides.
  • a gauze 6, a spacer 5 and an adjustment cylinder 3 are sequentially placed in order.
  • the two adjustment cylinders 3 need to be perforated at the corresponding positions of the pressure guiding holes on the main body 2, so that the upstream pressure guiding tube 4 and the downstream pressure guiding tube 9 are connected with the through holes on the adjusting cylinder 3, and the two adjusting cylinders 3 are
  • the length is determined on a case-by-case basis and may be inconsistent.
  • the two end caps 1 are respectively mounted at the two ends of the main body 2, and the fixed connection manner may be welding or screwing.
  • the end cap 1, the adjusting cylinder 3, the spacer 5, the gauze 6, and the laminar flow element 8 are fixed by an interference fit, ensuring the fixing of the laminar flow element 8 in the main body 2, and ensuring that the solid round bar 11 is hollow No displacement in the axial direction occurs in the cylinder 10.
  • the laminar flowmeter designed by the present invention uses ⁇ , the fluid flows through the end cap 1, the adjustment cylinder 3, flows through the laminar flow element 8, and forms a laminar flow in the laminar flow passage 12, and is in the layer.
  • the differential pressure is formed at both ends of the flow element 8; the differential pressure sensor 7 senses the differential pressure across the laminar flow element 8 through the upstream bow I and the downstream bow 9. According to the principle that the differential pressure is proportional to the fluid flow in the laminar flow state, the differential pressure sensor 7 can measure the magnitude of the flow by measuring the magnitude of the differential pressure.
  • the discharge mode of the solid round bar 11 in the laminar flow element 8 can also be adopted.
  • the fork rows are closely arranged, and the specific scheme refers to the practice in the first embodiment.
  • the laminar flowmeter designed by the technical scheme adopted in this embodiment has more stable laminar flow, higher measurement precision, and can adapt to a wider flow range.
  • the laminar flow element 8 can be fabricated by using a solid round rod 11 having a diameter of 3 mm.
  • the laminar flow element can be fabricated by using a solid round rod 11 having a diameter of 1 mm. .
  • the laminar flowmeter designed by using the embodiment has poor laminar flow stability, and the adapted flow range is slightly decreased, but the manufacturing cost is reduced.
  • the hollow cylinder 10 and the through hole provided therein can also be formed into other shapes, as long as the placement of the solid round bar 11 can be restricted, and the specific embodiment refers to the first embodiment or the second embodiment. .
  • the laminar flowmeter designed by the present invention creatively uses a solid round bar 11 to make a laminar flow element 8, a solid round bar 1
  • the cost of 1 is much lower than that of the capillary tube; the processing difficulty of the solid round bar 11 is much lower than that of the capillary tube, and the processing precision is higher; the smoothness of the outer surface of the solid round bar 11 can be higher than the smoothness of the inner surface of the capillary tube, Compared with the existing laminar flowmeter, the production cost is lower, the measurement precision is higher, and the flow range is wider.
  • the flow range that can be adapted in the prior art is 20 to 50 times, and the flow range that can be adapted by the invention reaches 20 ⁇ 200 times.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

一种层流流量计，包括端盖（１）、主体（２）、调整柱体（３）、上游引压管（４）、垫片（５）、纱网（６）、差压传感器（７）、层流元件（８）、下游引压管（９），其中，层流元件（８）由中空柱体（１０）和实心圆棒（１１）组成，层流元件（８）的两端依次设置有纱网（６）、垫片（５）和调整柱体（３）。

Description

发明名称：一种层流流量计
技术领域
[0001] 本发明涉及流量测量领域。
背景技术
[0002] 层流流量计是由层流元件和差压传感器构成的一种差压式流量计。 通过测量层 流元件两端的差压来测量流体流量， 其特点在于流量与差压成正比。
[0003] 目前层流流量计采用的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， 如申请号 CN201310341942.1 的发明专利公幵了一种气体流量计采用的层流发生体用不锈钢双层薄板卷制而 成， 一层为厚度小于 0.1mm波纹板， 另一层为厚度小于波纹板的光滑平板； 或者 用不锈钢毛细管集束而成， 毛细管的管径为 l~3mm， 壁厚为 0.05~0.15mm。 技术问题
[0004] 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很难 加工， 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。 这导致 层流流量计的价格居高不下， 测量精度低、 流量范围难以进一步提高。
问题的解决方案
技术解决方案
[0005] 本发明的目的是提供一种层流流量计， 解决现有层流流量计价格过高， 测量精 度、 流量范围难以进一步提高的问题。
[0006] 本发明的内容为： 一种层流流量计， 包括端盖、 主体、 调整柱体、 上游引压管 、 垫片、 纱网、 差压传感器、 层流元件、 下游引压管， 所述层流元件由中空柱 体和实心圆棒组成， 所述层流元件的两端依次设置有纱网、 垫片和调整柱体。
[0007] 所述主体两端均固定有端盖， 主体上幵有两引压孔， 分别与上游引压管和下游 弓 I压管固定连接， 上游弓 I压管和下游弓 I压管分别与差压传感器的两端固定连接
， 层流元件固定在主体内部两引压孔之间。 [0008] 所述纱网的面积大于中空柱体上的通孔面积。
[0009] 所述实心圆棒的直径小于等于 3mm， 所述实心圆棒长度与直径的比值大于等于 10: 1。
[0010] 所述实心圆棒的排列方式为顺排。
[0011] 所述实心圆棒的排列方式为叉排。
[0012] 所述实心圆棒与中空柱体之间、 实心圆棒与实心圆棒之间通过过盈配合固定。
[0013] 所述端盖、 调整柱体、 垫片、 纱网和层流元件之间通过过盈配合固定。
[0014] 应用本发明进行流量测量吋， 流体流过层流流量计， 在层流元件中的层流流道 内形成层流， 并在层流元件的两端形成差压； 差压与流体流量成正比； 差压传 感器通过测量差压的大小来测量流量的大小。
发明的有益效果
有益效果
[0015] 本发明创造性地解决了现有层流流量计遇到的问题， 大大降低了层流流量计的 生产成本。 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 ， 适用的流量范围更广。 本发明设计的层流流量计层流流量计与现有层流流量 计相比， 生产成本更低， 测量精度更高， 适应更广的流量范围。
对附图的简要说明
附图说明
[0016] 图 1为本发明的一种层流流量计。
[0017] 图 2为本发明的一种层流元件。
[0018] 图 3为本发明的一另种层流元件。
[0019] 图 4为本发明的另一种中空柱体结构示意图。
[0020] 图中： 1、 端盖， 2、 主体， 3、 调整柱体， 4、 上游引压管， 5、 垫片， 6、 纱网 ， 7、 差压传感器， 8、 层流元件， 9、 下游引压管， 10、 中空柱体， 11、 实心圆 棒， 12、 层流流道。 实施该发明的最佳实施例
本发明的最佳实施方式
[0021] 为使对本发明的结构特征和所达成的功效有进一步的了解和认识， 用以较佳的 实施例和附图配合详细说明， 说明如下：
[0022] 实施例一
[0023] 主体 2采用中空柱体结构， 壁厚为 25mm， 长为 100mm， 内设正方形通孔的尺寸 为 15*15mm。 在主体 2轴线方向上设有两个引压孔， 与主体 2上的通孔相连通， 分别位于层流元件 8的两侧， 孔的直径为 3mm。 主体 2可以选用不锈钢、 铝合金 或塑料等材料。
[0024] 将上游弓 I压管 4和下游弓 I压管 9分别固定在两个引压孔上， 固定方式可以为螺纹 连接或者焊接。 上游引压管 4和下游引压管 9可以选用不锈钢等材料制作。 上游 弓 I压管 4和下游弓 I压管 9分别与差压传感器 7的高压端和低压端相连,通过螺纹连接 或者焊接固定。
[0025] 层流元件 8固定在主体 2通孔内， 位于两引压孔之间。 层流元件 8由中空柱体 10 和实心圆棒 11组成。 所述中空柱体 10的壁厚为 5mm， 长度为 30mm， 正方形通孔 尺寸为 10*10mm。 中空柱体 10的材料可选用选用不锈钢、 铝合金或陶瓷等材料
[0026] 将 100根表面光滑的， 直径为 lmm， 长度为 30mm的实心圆棒 11沿中空柱体 10内 的通孔轴向紧密排列。 实心圆棒 11在中空柱体 10内的排列方式为顺排排列。 实 心圆棒 U可以选用不锈钢等材料。 中空柱体 10和实心圆棒 11， 实心圆棒 11相互 之间通过过盈配合固定。 中空柱体 10和实心圆棒 11， 实心圆棒 11相互之间的间 隙构成了层流流道 12。
[0027] 纱网 6的大小要能完全覆盖中空柱体 10上的通孔， 并且略大于中空柱体 10上的 通孔。 纱网 6设置于层流元件 8的两端。 纱网 6用于限定层流元件 8内实心圆棒的 轴向位移。 纱网 6的材料可以选择不锈钢或者塑料等耐腐蚀性材料。
[0028] 垫片 5的尺寸为 15*15mm， 厚度为 lmm。 垫片 5的正中央幵有一个 10*10mm的正 方形通孔。 垫片 5的材料可以选择不锈钢或塑料等耐腐蚀性材料。
[0029] 调整柱体 3可以采用中空柱体结构， 其壁厚为 5mm， 长为 35mm， 内设正方形通 孔的尺寸为 10*10mm。 调整柱体 3还可以可以采用若干根直径为 2mm， 长度为 35 mm的圆棒， 或者选用两片径向截面为 l*10mm， 长为 35mm的长方形柱体。 调整 柱体 3只需要满足端盖 1、 调整柱体 3、 垫片 5、 纱网 6、 层流元件 8之间在轴线方 向上的长度能够产生过盈配合的条件即可， 确保层流元件 8在主体 2内位置的固 定， 并保证实心圆棒 11在中空柱体 10内不会产生轴线方向上的位移。 调整柱体 3 可选用不锈钢、 铝合金或陶瓷等材料。
[0030] 端盖 1的径向截面尺寸为 40*40mm， 长为 10mm， 端盖 1径向截面的正中央幵有 一个直径为 15mm的通孔， 并装有 DN15的外螺纹管道连接头。 端盖 1可以选用不 锈钢、 铝合金或塑料等材料。
[0031] 将端盖 1、 调整柱体 3、 垫片 5、 纱网 6、 层流元件 8往主体 2上安装， 并确保端盖 1、 主体 2、 调整柱体 3、 垫片 5、 层流元件 8各自的轴线在同一条直线上， 具体安 装方式为： 将层流元件 8放置在主体 2上通孔的正中央， 使上游引压管 4和下游引 压管 9正好位于层流元件 8的两侧。 在层流元件 8的两侧分别按顺序依次放置一片 纱网 6， 一片垫片 5和一个调整柱体 3。 两个调整柱体 3在主体 2上引压孔对应位置 需要打孔， 使上游引压管 4和下游引压管 9与调整柱体 3上的通孔相连， 且两个调 整柱体 3的长度视具体情况确定， 可以不一致。 将两个端盖 1分别安装在主体 2的 两端， 固定连接方式可以为焊接或者螺纹连接。 端盖 1、 调整柱体 3、 垫片 5、 纱 网 6、 层流元件 8之间通过过盈配合固定， 确保层流元件 8在主体 2内位置的固定 ， 并保证实心圆棒 11在中空柱体 10内不会产生轴线方向上的位移。
[0032] 本发明设计的层流流量计在实际使用吋， 流体依次流过端盖 1、 调整柱体 3、 流经层流元件 8， 在层流流道 12内形成层流， 并在层流元件 8的两端形成差压； 差压传感器 7通过上游弓 I压管 4和下游弓 I压管 9感受到层流元件 8两端的差压。 根 据层流状态下差压与流体流量成正比的原理， 差压传感器 7可以通过测量差压的 大小来测量流量的大小。
本发明的实施方式
[0033] 实施例二
[0034] 在本发明设计的层流流量计中， 层流元件 8中实心圆棒 11的排放方式也可采用 叉排紧密排列， 具体方案参照实施例一中的做法。 本实施例采用的技术方案设 计的层流流量计同实施例一相比， 形成的层流更加稳定， 测量精度更高， 可以 适应更宽的流量范围。
[0035] 实施例三
[0036] 在本发明设计的层流流量计中， 层流元件 8可以采用直径 3mm的实心圆棒 11制 作， 具体方案可以参考实施例一采用直径 lmm的实心圆棒 11制作层流元件的做 法。 采用本实施例设计的层流流量计与实施例一相比， 形成的层流稳定性较差 ， 适应的流量范围稍有下降， 但是制作成本降低。
[0037] 实施例四
[0038] 如图 4所示， 中空柱体 10及其内设的通孔还可以制作成其他形状， 只要能够限 制实心圆棒 11的摆放即可， 具体方案参照实施例一或实施例二。
工业实用性
[0039] 本发明设计的层流流量计创造性地采用实心圆棒 11制作层流元件 8， 实心圆棒 1
1的成本要远远低于毛细管； 实心圆棒 11的加工难度要远低于毛细管， 加工精度 更高； 实心圆棒 11外表面的光滑度可以比毛细管的内表面的光滑度更高， 与现 有层流流量计相比， 生产成本更低， 测量精度更高， 流量范围更广， 现有技术 中可以适应的流量范围为 20〜50倍， 采用本发明可以适应的流量范围达到 20〜2 00倍。
[0040] 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 的改进都视为落入本发明的保护范围。

Claims

权利要求书
[权利要求 1] 一种层流流量计， 包括端盖 （1) 、 主体 （2) 、 调整柱体 （3) 、 上 游引压管 （4) 、 垫片 （5) 、 纱网 （6) 、 差压传感器 （7) 、 层流元 件 （8) 、 下游引压管 （9) ， 其特征在于： 所述层流元件 （8) 由中 空柱体 （10) 和实心圆棒 （11) 组成， 所述层流元件 （8) 的两端依 次设置有纱网 （6) 、 垫片 （5) 和调整柱体 （3) 。
[权利要求 2] 如权利要求 1所述的层流流量计， 其特征在于： 主体 （2) 两端均固定 有端盖 （1) ， 主体 （2) 上幵有两引压孔， 分别与上游引压管 （4) 和下游引压管 （9) 固定连接， 上游引压管 （4) 和下游引压管 （9) 分别与差压传感器 （7) 的两端固定连接， 层流元件 （8) 固定在主体 (2) 内部两引压孔之间。
[权利要求 3] 如权利要求 1所述的层流流量计， 其特征在于： 所述纱网 （6) 的面积 大于中空柱体 （10) 上的通孔面积。
[权利要求 4] 如权利要求 1所述的层流流量计， 其特征在于： 所述实心圆棒 （11) 的直径小于等于 3mm， 所述实心圆棒 （11) 长度与直径的比值大于等 于 10: 1。
[权利要求 5] 如权利要求 1所述的层流流量计， 其特征在于： 所述实心圆棒 （11) 的排列方式为顺排。
[权利要求 6] 如权利要求 1所述的层流流量计， 其特征在于： 所述实心圆棒 （11) 的排列方式为叉排。
[权利要求 7] 如权利要求 1所述的层流流量计， 其特征在于： 所述实心圆棒 （11) 与中空柱体 （10) 之间、 实心圆棒 （11) 与实心圆棒 （11) 之间通过 过盈配合固定。
[权利要求 8] 如权利要求 1所述的层流流量计， 其特征在于： 所述端盖 （1) 、 调整 柱体 （3) 、 垫片 （5) 、 纱网 （6) 和层流元件 （8) 之间通过过盈配 合固定。
PCT/CN2015/098015 2014-09-28 2015-12-21 一种层流流量计 Ceased WO2017049782A1 (zh)

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