JPH035527B2 - - Google Patents
Info
- Publication number
- JPH035527B2 JPH035527B2 JP8065883A JP8065883A JPH035527B2 JP H035527 B2 JPH035527 B2 JP H035527B2 JP 8065883 A JP8065883 A JP 8065883A JP 8065883 A JP8065883 A JP 8065883A JP H035527 B2 JPH035527 B2 JP H035527B2
- Authority
- JP
- Japan
- Prior art keywords
- oval
- gear
- long diameter
- porous
- 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
- 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
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000000034 method Methods 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, the amount of fluid passing within a certain predetermined time is Q, the rotation speed 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.
目 的
本発明は、上述のごときオーバル流量計におけ
る上記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 the measurement error in the oval flowmeter as described above.
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該歯
車と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。本発明は、この漏
れ流量を少なくするためになされたもので、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、これと噛合する短
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
長径部と計量室内壁面との間にラビリンス効果が
作用し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１０ａ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３０′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よりの漏れ
量を減少することができ、従つて、計量精度を更
に向上させることができる。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 mentioned above, in oval gears, fluid leaks through the gap between the gear and the wall surface of the measuring chamber while the gears are meshing.
This causes measurement errors. The present invention was made to reduce this leakage flow rate, and the second
The teeth shown in the shaded area in the diagram, that is, a part of the teeth on the long diameter part of the oval gear, and a part of the teeth on the short diameter part that mesh with these teeth are cut out, and the long diameter part after cutting is shown in Fig. 3. As shown in the figure, a porous plate 30 made of a honeycomb plate, metal foam, resin foam, etc. is provided, and by doing so, a labyrinth effect is created between the long diameter part of the oval gear and the wall surface of the measuring chamber. This reduces the amount of leakage. In addition, Figure 4 shows
This 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. In the illustrated example, the tooth 10a on the long diameter part is removed leaving the central part 10a'. Conversely, the central portion may be cut off and both ends may be left intact. Furthermore, as shown in FIG. 3, it is also possible to provide porous plates 30' 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 with the indoor wall can be reduced, and therefore, the measurement accuracy can be further improved.
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、歯車の両
側壁にも多孔質板を設けることによつてラビリン
ス効果を持たせ、歯車と計量室内壁との隙間から
の漏れ量を少なくして計量精度を向上させること
ができる。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 part of the oval gear is formed of a porous plate such as a honeycomb plate, metal foam, or resin foam, and the gear By providing porous plates on both side walls of the measuring chamber, a labyrinth effect can be created, reducing the amount of leakage from the gap between the gear and the wall of the measuring chamber, thereby improving measuring accuracy. Furthermore, in the present invention, even if a porous plate is used, it is easy to process and maintain surface accuracy, so it is possible to accurately regulate the gap between opposing surfaces that produces a labyrinth effect.
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
−線方向から見た図である。
１……計量室、１０，２０……オーバル歯車、
１０ａ，２０ａ……長径部、１０a′，２０a′……
長径部歯部、１０ｂ，２０ｂ……長径部と係合す
る部分、１１，２１……回転軸、３０，３０′…
…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 an enlarged view of the main part of FIG. 4, as viewed from the - line direction of FIG. 1...Measuring chamber, 10, 20...Oval gear,
10a, 20a...long diameter part, 10a', 20a'...
Long diameter tooth portion, 10b, 20b... portion that engages with the long diameter portion, 11, 21... rotating shaft, 30, 30'...
...Porous board.
Claims (1)
ル流量計において、各オーバル歯車は、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、前記長径部に噛合
する短径部において対応する歯の一部が削除され
ていることを特徴とするオーバル流量計。 ２ 前記各歯車の両側面に多孔質板が配設されて
い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。 ４ 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。[Scope of Claims] 1. In an oval flowmeter having a pair of meshing oval gears, each oval gear has a part of its teeth removed from its long diameter portion, and a porous plate is disposed in the valley portion including the removed portion. 1. An oval flowmeter characterized in that a portion of corresponding teeth in a short diameter portion that meshes with the long diameter portion are removed. 2. The oval flowmeter according to claim 1, wherein porous plates are provided on both sides of each gear. 3. The oval flowmeter according to claim 1, wherein the porous plate is a honeycomb plate. 4. 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 |
|---|---|---|---|
| JP8065883A JPS59204712A (en) | 1983-05-09 | 1983-05-09 | Oval flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8065883A JPS59204712A (en) | 1983-05-09 | 1983-05-09 | Oval flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59204712A JPS59204712A (en) | 1984-11-20 |
| JPH035527B2 true JPH035527B2 (en) | 1991-01-25 |
Family
ID=13724453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8065883A Granted JPS59204712A (en) | 1983-05-09 | 1983-05-09 | Oval flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59204712A (en) |
-
1983
- 1983-05-09 JP JP8065883A patent/JPS59204712A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59204712A (en) | 1984-11-20 |
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