JPH035528B2 - - Google Patents
Info
- Publication number
- JPH035528B2 JPH035528B2 JP8065983A JP8065983A JPH035528B2 JP H035528 B2 JPH035528 B2 JP H035528B2 JP 8065983 A JP8065983 A JP 8065983A JP 8065983 A JP8065983 A JP 8065983A JP H035528 B2 JPH035528 B2 JP H035528B2
- Authority
- JP
- Japan
- Prior art keywords
- oval
- gear
- porous plate
- diameter portion
- flowmeter
- 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.)
- Expired
Links
- 238000005259 measurement Methods 0.000 claims description 5
- 239000006262 metallic foam Substances 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000005303 weighing Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
- G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
- G01F3/04—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls
- G01F3/06—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls comprising members rotating in a fluid-tight or substantially fluid-tight manner in a housing
- G01F3/10—Geared or lobed impeller meters
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Description
【発明の詳細な説明】 技術分野 本発明は、オーバル流量計の改良に関する。[Detailed description of the invention] Technical field The present invention relates to improvements in oval flowmeters.
従来技術
第１図は、オーバル流量計の概略構成図で、図
中、１は計量室、１０及び２０はオーバル歯車、
１１及び２１は各オーバル歯車１０及び２０の回
転軸で、該オーバル流量計は、周知のように、被
測定流体の流入圧と流出圧の差によつて、縦の位
置にある歯車（図示例においては歯車２０）が矢
印方向に回転され、１回転当り計量室の体積Ｖの
４倍の体積の流体を送り出すものである。すなわ
ち、ある所定時間内の流体通過量をＱ、回転数を
ｎ、歯車と計量室内壁間との隙間よりの漏れ量を
ｑとすれば、
Ｑ＝4Vn＋ｑ
で表わされ、ｑが計量誤差となる。Prior Art FIG. 1 is a schematic diagram of an oval flowmeter, in which 1 is a measuring chamber, 10 and 20 are oval gears,
Reference numerals 11 and 21 denote rotation axes of the oval gears 10 and 20, and as is well known, the oval flowmeter rotates the gears (in the illustrated example) in a vertical position depending on the difference between the inflow and outflow pressures of the fluid to be measured. In this case, the gear 20) is rotated in the direction of the arrow, and a volume of fluid four times the volume V of the metering chamber is delivered per rotation. In other words, if the amount of fluid passing within a certain predetermined time is Q, the number of revolutions is n, and the amount of leakage from the gap between the gear and the wall of the measuring chamber is q, then it is expressed as Q = 4Vn + q, where q is the measurement error. Become.
目 的
本発明は、上述のごときオーバル流量計におけ
る計量誤差を小さくすることを目的としてなされ
たものである。Purpose The present invention has been made for the purpose of reducing measurement errors in the above-mentioned oval flowmeter.
構 成
第２図は、本発明の一実施例を説明するための
要部すなわち第１図に示したＡ部の拡大部分図
で、一方のオーバル歯車１０の長径部１０ａが他
方のオーバル歯車２０の短径部２０ｂと噛合して
いる場合を示す。而して、オーバル歯車において
は、前述のように、歯車が噛合している間に計量
室内壁面との隙間を通して流体が漏れ、これが計
量誤差の原因となる。本発明の目的は、この漏れ
流量を少なくすることにあり、第２図中に斜線に
て示す部分の歯すなわちオーバル歯車の長径部の
歯の一部、及び、該長径部と噛合する短径部の歯
の一部を切り取り、切り取つた後の長径部に、第
３図に示すように、ハネカム板、金属発泡体、或
いは、樹脂発泡体等の多孔質板３０を設けたもの
で、このようにすると、オーバル歯車の長径部噛
合時にラビリンス効果が得られて漏れ量が少なく
なる。なお、第４図は、第３図の−線方向か
ら見た図で、多孔質板としてハネカム板を用いた
場合の図で、図示例においては、長径部の歯１０
ａは中央部１０a′を残して切除されているが、逆
に、中央部を切除して両端部を残すようにしても
よい。また、第３図に示すように、歯車の両側面
に前述のごときハネカム板、金属発泡体等のラビ
リンス効果を奏する多孔質板３０ａを設けること
も可能で、このようにすると、歯車と計量室内壁
との間の隙間からの漏れ量を減少することがで
き、計量精度を更に向上させることができる。本
発明は、上記目的をより効果的に達成するため
に、第５図に示すように、計量室１内のオーバル
歯車１０及び２０の長径部１０ａ及び２０ａと対
向する円弧面、及びこれら両オーバル歯車の両側
面に対向する平面に多孔質板３０ｂを設け、これ
によつて、オーバル歯車と計量室内壁間にラビリ
ンス効果を作用させて漏れを少なくするようにし
たものである。Structure FIG. 2 is an enlarged partial view of the main part for explaining one embodiment of the present invention, that is, the section A shown in FIG. The case is shown in which it is engaged with the short diameter portion 20b of. As described above, in the case of oval gears, fluid leaks through the gap between the gears and the wall surface of the measuring chamber while the gears are in mesh, which causes measurement errors. The purpose of the present invention is to reduce this leakage flow rate, and the teeth of the hatched portion in FIG. As shown in FIG. 3, a porous plate 30 such as a honeycomb plate, metal foam, or resin foam is provided on the long diameter part after cutting out a part of the teeth of the tooth. By doing so, a labyrinth effect is obtained when the long diameter portion of the oval gear meshes, and the amount of leakage is reduced. In addition, FIG. 4 is a view seen from the - line direction of FIG. 3, and is a view when a honeycomb plate is used as the porous plate.
A is cut off leaving the center portion 10a'; however, it is also possible to cut off the center portion and leave both ends. Furthermore, as shown in FIG. 3, it is also possible to provide porous plates 30a such as honeycomb plates, metal foam, etc., which have a labyrinth effect, on both sides of the gear. The amount of leakage from the gap between the wall and the wall can be reduced, and the measurement accuracy can be further improved. In order to achieve the above object more effectively, the present invention provides circular arc surfaces facing the long diameter portions 10a and 20a of the oval gears 10 and 20 in the measuring chamber 1, and A porous plate 30b is provided on a plane facing both sides of the gear, thereby creating a labyrinth effect between the oval gear and the wall of the measuring chamber to reduce leakage.
効 果
以上の説明から明らかなように、本発明による
と、オーバル流量計において、オーバル歯車の長
径部をハネカム板、金属発泡体、或いは、樹脂発
泡体等の多孔質板で形成するとともに、これと対
向する面及びオーバル歯車の側面に対向する面に
多孔質板を設けたのでより大きなラビリンス効果
を期待出来、これにより歯車と計量室内壁との隙
間からの漏れ量が少なくなり計量精度をより向上
することが出来る。また、本発明においては、多
孔質板を使用しても加工及び面精度維持が容易な
ため、ラビリンス効果を奏する対向面の隙間を正
確に規正することができる。Effects As is clear from the above description, according to the present invention, in the oval flowmeter, the long diameter portion of the oval gear is formed of a porous plate such as a honeycomb plate, metal foam, or resin foam. Since a porous plate is provided on the surface facing the oval gear and the surface facing the side of the oval gear, a greater labyrinth effect can be expected, which reduces the amount of leakage from the gap between the gear and the wall of the weighing chamber, improving weighing accuracy. It can be improved. Furthermore, in the present invention, even if a porous plate is used, it is easy to process and maintain surface accuracy, so the gap between the opposing surfaces that produces the labyrinth effect can be accurately regulated.
第１図は、オーバル流量計の動作原理を説明す
るための概略構成図、第２図は、本発明を説明す
るための原理図、第３図は、本発明の一実施例を
説明するための要部拡大図、第４図は、第３図の
−線方向から見た図、第５図は、本発明によ
る計量室内の概略構成図である。
１……計量室、１０，２０……オーバル歯車、
１０ａ，２０ａ……長径部、１０ｂ，２０ｂ……
長径部と係合する短径部分、１１，２１……回転
軸、３０，３０ａ，３０ｂ……多孔質板。
Fig. 1 is a schematic configuration diagram for explaining the operating principle of an oval flowmeter, Fig. 2 is a principle diagram for explaining the present invention, and Fig. 3 is a diagram for explaining an embodiment of the present invention. FIG. 4 is a view seen from the - line direction of FIG. 3, and FIG. 5 is a schematic diagram of the inside of the measuring chamber according to the present invention. 1...Measuring chamber, 10, 20...Oval gear,
10a, 20a... Long diameter portion, 10b, 20b...
Short diameter portion engaging with the long diameter portion, 11, 21...rotating shaft, 30, 30a, 30b...porous plate.
Claims (1)
バル歯車は、各長径部において歯の一部が削除さ
れて該削除部を含む谷部に多孔質板が配設され、
かつ、前記各長径部に噛合する短径部においても
歯の一部が削除されているオーバル流量計におい
て、各オーバル歯車の長径部と対向する計量室内
壁面及び各オーバル歯車の両側面と対向する計量
室内壁面に多孔質板が配設されていることを特徴
とするオーバル流量計。 ２ 前記多孔質板がハネカム板であることを特徴
とする特許請求の範囲第１項に記載のオーバル流
量計。 ３ 前記多孔質部材が金属発泡体或いは樹脂発泡
体であることを特徴とする特許請求の範囲第１項
に記載のオーバル流量計。[Claims] 1. A pair of oval gears that mesh with each other, each oval gear has a part of its teeth removed at each major diameter portion, and a porous plate is disposed in the valley including the deleted portion. ,
In addition, in the oval flowmeter in which a portion of the teeth are also removed in the short diameter portion that meshes with each of the long diameter portions, the measuring chamber wall surface facing the long diameter portion of each oval gear and both side surfaces of each oval gear. An oval flowmeter characterized by a porous plate arranged on the wall surface of the measurement chamber. 2. The oval flowmeter according to claim 1, wherein the porous plate is a honeycomb plate. 3. The oval flowmeter according to claim 1, wherein the porous member is a metal foam or a resin foam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8065983A JPS59204713A (en) | 1983-05-09 | 1983-05-09 | Oval flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8065983A JPS59204713A (en) | 1983-05-09 | 1983-05-09 | Oval flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59204713A JPS59204713A (en) | 1984-11-20 |
| JPH035528B2 true JPH035528B2 (en) | 1991-01-25 |
Family
ID=13724484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8065983A Granted JPS59204713A (en) | 1983-05-09 | 1983-05-09 | Oval flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59204713A (en) |
-
1983
- 1983-05-09 JP JP8065983A patent/JPS59204713A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59204713A (en) | 1984-11-20 |
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