JP2001124280A - Orifice plate - Google Patents
Orifice plateInfo
- Publication number
- JP2001124280A JP2001124280A JP31003799A JP31003799A JP2001124280A JP 2001124280 A JP2001124280 A JP 2001124280A JP 31003799 A JP31003799 A JP 31003799A JP 31003799 A JP31003799 A JP 31003799A JP 2001124280 A JP2001124280 A JP 2001124280A
- Authority
- JP
- Japan
- Prior art keywords
- orifice plate
- hole
- fluid
- cavitation
- pipe
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、流体輸送配管内に
配置されて流体に圧力損失を与えるオリフィス板に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an orifice plate which is disposed in a fluid transport pipe and applies a pressure loss to a fluid.
【０００２】[0002]
【従来の技術】図９に示すとおり、中心にひとつの貫通
孔４ａを設けたオリフィス板４が知られている。2. Description of the Related Art As shown in FIG. 9, an orifice plate 4 having one through hole 4a at the center is known.
【０００３】[0003]
【発明が解決しようとする課題】図９は、液体のような
非圧縮性流体が管路（内径Ｄ）内を充満して流れるとき
のオリフィス板４付近の流れの様子とその流体の圧力変
化を示す。流体はオリフィス板４の上流側Ｄに相当した
距離あたりではがれ、オリフィス板４の貫通孔４ａを通
過した後も慣性のため収縮を続け、オリフィス板４から
Ｄ／２ぐらい離れたところでの断面積は最小（縮流）と
なる。このはがれはじめの断面を位置１、縮流の断面を
位置２とすると、位置２では流速が最大となり、従って
圧力Ｐが最低の圧力Ｐ2となる。そのため、流体の飽和
蒸気圧がこの圧力Ｐ2よりも高い場合には流体が気化し
てキャビテーション気泡が発生する。この位置２よりも
下流では流体の圧力が上昇するので、流体の圧力が飽和
蒸気圧を越える位置においてキャビテーション気泡が一
斉に消滅する。このとき気泡が潰れる衝撃によって、振
動が発生する。配管の略同位置で振動が発生するため、
この振動が配管に伝わって騒音や共振の発生を招く。ま
た、同径・同一形状の貫通孔を複数設けた多孔オリフィ
ス板も知られているが、これにも同様の問題がある。FIG. 9 is a diagram showing a flow state near the orifice plate 4 and a pressure change of the fluid when an incompressible fluid such as a liquid is filled and flows in a pipe (inner diameter D). Is shown. The fluid separates at a distance corresponding to the upstream side D of the orifice plate 4, continues to contract due to inertia even after passing through the through hole 4a of the orifice plate 4, and has a cross-sectional area at a distance of D / 2 from the orifice plate 4. Is minimum (contraction). The peeling the beginning of the cross-section position 1, when the cross-section of the contraction flow and position 2, in position 2 flow rate is maximized, thus the pressure P becomes the minimum pressure P 2. Therefore, the saturated vapor pressure of the fluid cavitation bubbles generated vaporized fluid is higher than the pressure P 2. Since the pressure of the fluid increases downstream of the position 2, the cavitation bubbles disappear at a position where the pressure of the fluid exceeds the saturated vapor pressure. At this time, vibration is generated by the impact of the collapse of the bubbles. Vibration occurs at approximately the same position in the piping,
This vibration is transmitted to the pipe and causes noise and resonance. Further, a perforated orifice plate provided with a plurality of through holes having the same diameter and the same shape is also known, but this has the same problem.
【０００４】また、従来の調節弁内蔵用オリフィス板に
おいて、図１０の側断面図に示すように、オリフィス板
５の周囲に雄ネジ５ｓｃを刻設しておき、ネジ構造によ
る座面摩擦で配管６に固定する構造であった場合に、オ
リフィス板５のねじ込みが不十分であると流体反力によ
りネジが緩んでしまう可能性があった。In a conventional orifice plate with a built-in control valve, a male screw 5sc is engraved around the orifice plate 5 as shown in a side sectional view of FIG. In the case where the orifice plate 5 is fixed to the screw 6, if the screwing of the orifice plate 5 is insufficient, the screw may be loosened by the fluid reaction force.
【０００５】本発明は、上記従来のオリフィス板の持つ
問題点を解消し、キャビテーション気泡の消滅位置すな
わちキャビテーション回復位置を流体の流れ方向に分散
させることによって、配管の振動とこれにともなう騒音
を低減することが可能なオリフィス板の提供を第１の課
題とする。本発明は、また、上記従来の調節弁内蔵要オ
リフィス板の持つ問題点を解消し、流体反力によりネジ
が緩んでしまう可能性のないオリフィス板の提供を第２
の課題とする。The present invention solves the above-mentioned problems of the conventional orifice plate, and reduces the vibration of the pipe and the accompanying noise by dispersing the position where the cavitation bubbles disappear, that is, the position where the cavitation is recovered, in the flow direction of the fluid. An object of the present invention is to provide an orifice plate capable of performing the above operation. Another object of the present invention is to provide an orifice plate which solves the above-mentioned problems of the conventional orifice plate with a built-in control valve and which is unlikely to loosen a screw due to a fluid reaction force.
Subject.
【０００６】[0006]
【課題を解決するための手段】上記第１の課題を解決し
た本発明の第１の態様は、複数の貫通孔を備え、流体が
流れる管路の中に設置されて、その流体に圧力損失を発
生させるオリフィス板であって、中心付近設けられた第
１の貫通孔と周辺付近に設けられた第２の貫通孔との形
状およびまたは内径が異なることを特徴としたオリフィ
ス板である。According to a first aspect of the present invention, which has solved the above first object, a plurality of through-holes are provided in a pipe through which a fluid flows, and the fluid has a pressure loss. The orifice plate is characterized in that the first through hole provided near the center and the second through hole provided near the periphery have different shapes and / or inner diameters.
【０００７】上記のように構成すれば、貫通孔の形状お
よびまたは内径の差異により、中心付近の貫通孔を通過
した流体のキャビテーション回復位置と、周辺付近の貫
通孔を通過した流体のキャビテーション回復位置とが異
なるので、キャビテーションの回復にともなう配管の振
動発生や管内壁腐食の位置が分散される。また、周辺付
近の第２の貫通孔を通過した流体の流れが、中心付近の
第１の貫通孔を通過した流体のキャビテーション回復位
置において緩衝材としての役割を果たす。その結果とし
て、騒音および管内損傷の低減を図ることができる。[0007] With the above configuration, the cavitation recovery position of the fluid passing through the through-hole near the center and the cavitation recovery position of the fluid passing through the through-hole near the center are determined by the difference in shape and / or inner diameter of the through hole. Therefore, the occurrence of vibration of the pipe and the corrosion of the pipe inner wall due to the recovery of cavitation are dispersed. In addition, the flow of the fluid that has passed through the second through hole near the periphery serves as a buffer at the cavitation recovery position of the fluid that has passed through the first through hole near the center. As a result, noise and damage in the pipe can be reduced.
【０００８】本発明の第２の態様は、上記第１の態様に
おいて、前記第１の貫通孔は、その断面積が管軸方向で
徐々に変化するフローノズル形状、ベンチュリ管形状ま
たはテーパ管形状等のいずれかであり、前記第２の貫通
孔は、その断面積が管軸方向で一定のものであることを
特徴とするオリフィス板である。According to a second aspect of the present invention, in the first aspect, the first through hole has a flow nozzle shape, a Venturi tube shape or a tapered tube shape whose sectional area gradually changes in the tube axis direction. Wherein the second through hole has an orifice plate having a constant cross-sectional area in the tube axis direction.
【０００９】上記のように構成すれば、前記第１の態様
の作用・効果に加えて、さらに、懸濁液や多少の固形物
を含む液体あるいは高速流体等の磨耗腐食性の高い流体
に適しているものが得られる。According to the structure described above, in addition to the functions and effects of the first aspect, the present invention is suitable for a fluid having high wear and corrosiveness, such as a suspension, a liquid containing some solid matter, or a high-speed fluid. What you get.
【００１０】本発明の第３の態様は、上記第１の態様に
おいて、前記第１の貫通孔は流体の流れ方向を変化させ
る斜め孔または内壁に斜めのフィンを備えた貫通孔等の
いずれかであり、前記第２の貫通孔はその流体の流れ方
向が管軸方向に平行なストレートなものであることを特
徴とするオリフィス板である。According to a third aspect of the present invention, in the first aspect, the first through hole is any one of an oblique hole for changing a flow direction of a fluid and a through hole having an oblique fin on an inner wall. The orifice plate is characterized in that the second through hole is a straight one in which the flow direction of the fluid is parallel to the tube axis direction.
【００１１】上記のように構成すれば、前記第１の態様
の作用・効果と同じ作用効果をさらに増大させることが
できる。With the above configuration, the same operation and effect as the first embodiment can be further enhanced.
【００１２】前記第１および第２の課題を解決した本発
明の第５の態様は、上記第３または第４の態様におい
て、前記オリフィス板を前記流体が流れる管路の中にネ
ジ込みによって固定するものである場合に、前記第１ま
たは第２の貫通孔がこれを通過する流れの方向を、流体
反力によってオリフィス板をネジ込み方向に回転させる
ようなトルクを発生させる方向に変化させるものである
ことを特徴とするオリフィス板である。According to a fifth aspect of the present invention, which has solved the first and second problems, in the third or fourth aspect, the orifice plate is fixed by screwing it into a conduit through which the fluid flows. The first or second through-hole changes the direction of the flow passing therethrough to a direction in which a torque is generated to rotate the orifice plate in a screwing direction by a fluid reaction force. An orifice plate characterized in that:
【００１３】上記のように構成すれば、上記第３または
第４の態様の作用・効果の他に、オリフィス板のネジの
緩みを防止することができる。According to the above configuration, in addition to the operation and effect of the third or fourth aspect, loosening of the screw of the orifice plate can be prevented.
【００１４】前記第２の課題のみを解決した本発明の第
６の態様は、オリフィス板を前記流体が流れる管路の中
にネジ込みによって固定するものである場合に、いくつ
かの貫通孔の方向を、その中を流れる流体の反力によっ
てネジが締まる方向にトルクが発生するように、流れ方
向に対して角度を持たせたことを特徴とするオリフィス
板である。According to a sixth aspect of the present invention, which solves only the second problem, when the orifice plate is fixed by screwing into the conduit through which the fluid flows, several through holes are formed. An orifice plate characterized in that the direction is angled with respect to the flow direction so that a torque is generated in a direction in which a screw is tightened by a reaction force of a fluid flowing therein.
【００１５】上記のように構成すれば、オリフィス板の
ネジの緩みを防止することができる。According to the above-mentioned structure, the screw of the orifice plate can be prevented from loosening.
【００１６】前記第２の課題のみを解決した本発明の第
７の態様は、オリフィス板を前記流体が流れる管路の中
にネジ込みによって固定するものである場合に、オリフ
ィス板の上流側の表面に、これに衝突する流体の反力に
よって、ネジが締まる方向にトルクが発生するように、
複数の突起を設けたことを特徴とするオリフィス板であ
る。According to a seventh aspect of the present invention, which solves only the second problem, when the orifice plate is fixed by screwing into the conduit through which the fluid flows, the orifice plate is located upstream of the orifice plate. In order to generate torque in the direction of screw tightening by the reaction force of the fluid that collides with the surface,
An orifice plate provided with a plurality of projections.
【００１７】上記のように構成すれば、オリフィス板の
ネジの緩みを防止することができる。According to the above configuration, it is possible to prevent the screw of the orifice plate from loosening.
【００１８】[0018]
【発明の実施の形態】本発明の実施の態様を添付の図面
を参照して以下に説明する。図１は第１または第２の実
施の態様に係る本発明のオリフィス板の一実施の形態の
正面図、図２は同実施の形態のオリフィス板を流体が流
れる管路の中に設置した状態とその作用を示す側断面図
である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view of an embodiment of the orifice plate according to the first or second embodiment of the present invention, and FIG. 2 is a state in which the orifice plate of the embodiment is installed in a conduit through which a fluid flows. FIG. 3 is a side sectional view showing the operation of the embodiment.
【００１９】本実施の形態におけるオリフィス板１０
は、図１および図２に示すように、中心付近設けられた
第１の貫通孔１０ａと周辺付近に設けられた複数の第２
の貫通孔１０ｂとの内径を前者が後者よりも大きくなる
ように差異をつけるとともに、第１の貫通孔１０ａを入
り口の広いフローノズル形状とし、第２の貫通孔１０ｂ
を管軸方向に断面積の変化のないストレート管形状とし
たものである。The orifice plate 10 in the present embodiment
As shown in FIGS. 1 and 2, a first through hole 10a provided near the center and a plurality of second through holes provided near the periphery are provided.
The inner diameter of the first through hole 10b is made larger than that of the second through hole 10b by making the inner diameter of the second through hole 10b larger than that of the second through hole 10b.
Is a straight tube shape having no change in cross-sectional area in the tube axis direction.
【００２０】上記のように構成することによって、第１
の貫通孔１０ａと第２の貫通孔１０ｂとの形状および内
径の差異により、図２に示すように、中心付近の第１の
貫通孔１０ａを通過した流体のキャビテーション回復位
置１１ａと、周辺付近の第２の貫通孔１０ｂを通過した
流体のキャビテーション回復位置１１ｂとが、前者がオ
リフィス板出側より相対的に遠い位置に、後者がオリフ
ィス板出側より相対的に近い位置にあってそれぞれ異な
るので、キャビテーションの回復にともなう配管の振動
発生や管内壁腐食の位置が分散される。また、周辺付近
の第２の貫通孔１０ｂを通過した流体の流れが、中心付
近の第１の貫通孔１０ａを通過した流体のキャビテーシ
ョン回復位置１１ａにおける緩衝材としての役割を果た
す。その結果として、騒音および管内損傷の低減を図る
ことができる。With the above configuration, the first
Due to the difference in shape and inner diameter between the through hole 10a and the second through hole 10b, as shown in FIG. 2, the cavitation recovery position 11a of the fluid passing through the first through hole 10a near the center, and the vicinity of the periphery The cavitation recovery position 11b of the fluid passing through the second through-hole 10b is different from the cavitation recovery position 11b because the former is at a position relatively farther from the orifice plate exit side and the latter is at a position relatively closer to the orifice plate exit side. In addition, the position of the occurrence of pipe vibration and the corrosion of the pipe inner wall due to the recovery of cavitation is dispersed. The flow of the fluid that has passed through the second through hole 10b near the periphery serves as a buffer at the cavitation recovery position 11a of the fluid that has passed through the first through hole 10a near the center. As a result, noise and damage in the pipe can be reduced.
【００２１】なお、上記の実施の形態においては、第１
の貫通孔１０ａをフローノズル形状としたが、本発明は
これに限るものではなく、入り口と出口の内径が管軸方
向中央部の内径よりも大きなベンチュリ管形状や、入り
口と出口の内径が異なるテーパ管形状としてもよく、要
するに、その断面積が管軸方向で徐々に変化するような
形状であればよい。このような形状とすることによっ
て、上記の作用・効果に加えて、さらに、懸濁液や多少
の固形物を含む液体あるいは高速流体等の磨耗腐食性の
高い流体に適しているものが得られる。In the above-described embodiment, the first
The through hole 10a is formed in the shape of a flow nozzle, but the present invention is not limited to this, and the inner diameter of the inlet and outlet is larger than the inner diameter of the central portion in the pipe axis direction, and the inner diameter of the inlet and outlet is different. The shape may be a tapered tube, in short, any shape may be used as long as its cross-sectional area gradually changes in the tube axis direction. By adopting such a shape, in addition to the above-described functions and effects, a fluid suitable for a highly corrosive fluid such as a suspension or a liquid containing some solid matter or a high-speed fluid can be obtained. .
【００２２】図３は第３の実施の態様に係る本発明のオ
リフィス板の一実施の形態の正面図、図４は同実施の形
態のオリフィス板を流体が流れる管路の中に設置した状
態とその作用を示す斜視図である。FIG. 3 is a front view of an orifice plate according to a third embodiment of the present invention, and FIG. 4 is a view showing the orifice plate of the same embodiment installed in a conduit through which a fluid flows. FIG.
【００２３】本実施の形態におけるオリフィス板１２
は、図３および図４に示すように、中心付近設けられた
第１の貫通孔１２ａは流体の流れ方向を変化させる斜め
孔とし、周辺付近に設けられた複数の第２の貫通孔１２
ｂは流体の流れ方向を変化させないストレート孔とした
ものである。The orifice plate 12 in the present embodiment
As shown in FIGS. 3 and 4, a first through hole 12a provided near the center is an oblique hole that changes the flow direction of the fluid, and a plurality of second through holes 12 provided near the periphery.
b is a straight hole which does not change the flow direction of the fluid.
【００２４】上記のように構成することによって、第１
の貫通孔１２ａと第２の貫通孔１２ｂとの流体の流れ方
向の差異により、図４に示すように、中心付近の第１の
貫通孔１２ａを通過した流体により渦が発生するため
に、そのキャビテーション回復位置１３ａと、周辺付近
の第２の貫通孔１２ｂを通過した流体のキャビテーショ
ン回復位置１２ｂとが、前者がオリフィス板出側より相
対的に近い位置に、後者がオリフィス板出側より相対的
に遠い位置にあってそれぞれ位置が異なるので、キャビ
テーションの回復にともなう配管の振動発生や管内壁腐
食の位置が分散される。また、周辺付近の第２の貫通孔
１２ｂを通過した流体の流れが、中心付近の第１の貫通
孔１２ａを通過した流体のキャビテーション回復位置１
３ａにおける緩衝材としての役割を果たす。その結果と
して、騒音および管内損傷の低減を図ることができる。With the above configuration, the first
Due to the difference in the flow direction of the fluid between the through hole 12a and the second through hole 12b, a vortex is generated by the fluid passing through the first through hole 12a near the center as shown in FIG. The cavitation recovery position 13a and the cavitation recovery position 12b of the fluid that has passed through the second through hole 12b near the periphery are such that the former is relatively closer to the orifice plate exit side and the latter is relatively to the orifice plate exit side. Are located far from each other, and the positions are different from each other, so that the positions of the occurrence of pipe vibration and the corrosion of the inner wall of the pipe due to the recovery of cavitation are dispersed. Further, the flow of the fluid passing through the second through hole 12b near the periphery is changed to the cavitation recovery position 1 of the fluid passing through the first through hole 12a near the center.
3a serves as a cushioning material. As a result, noise and damage in the pipe can be reduced.
【００２５】図５は第４および第５の実施の態様に係る
本発明のオリフィス板と同じ作用・効果を奏する発明の
一実施の形態の正面図、図６は同実施の形態のオリフィ
ス板を流体が流れる管路の中に設置した状態とその作用
を示す斜視図である。FIG. 5 is a front view of an embodiment of the present invention having the same operation and effect as the orifice plate of the present invention according to the fourth and fifth embodiments. FIG. 6 shows the orifice plate of the embodiment. It is a perspective view showing the state where it was installed in the pipeline in which the fluid flows, and its operation.
【００２６】本発明の実施の形態におけるオリフィス板
１６は、リング状のオリフィス板１６の内壁に複数の斜
めのフィン１６ｆを設けたものである。なお、このオリ
フィス板１６はねじ込みによって流体の流れる配管内に
固定されるものであって、前記の斜めのフィンの方向
は、このフィンに沿って通過する流れの方向を、流体反
力によってオリフィス板１６をネジ込み方向に回転させ
るようなトルクを発生させる方向に変化させる方向に形
成されている。The orifice plate 16 in the embodiment of the present invention has a plurality of oblique fins 16f provided on the inner wall of the ring-shaped orifice plate 16. The orifice plate 16 is fixed in a pipe through which fluid flows by screwing, and the direction of the oblique fins is changed in the direction of the flow passing along the fins by the fluid reaction force. 16 is formed in such a direction as to change the direction in which a torque is generated so as to rotate the screw 16 in the screwing direction.
【００２７】上記のように構成することによって、図６
に示すように、リング状のオリフィス板１６の内壁の複
数の斜めのフィン１６fに沿って、これに導かれて流れ
る流体により渦が発生するために、そのキャビテーショ
ン回復位置１７ｂと、リング状のオリフィス板１６の中
央部を通過した流体により渦が発生せず、そのキャビテ
ーション回復位置１７ａとは、前者がオリフィス板出側
より相対的に近い位置に、後者がオリフィス板出側より
相対的に遠い位置にあってそれぞれ位置が異なるので、
キャビテーションの回復にともなう配管の振動発生や管
内壁腐食の位置が分散される。また、内壁のフィン１６
fに沿って通過した流体の流れが、中央を通過した流体
のキャビテーション回復位置１７ａにおける緩衝材とし
ての役割を果たす。その結果として、騒音および管内損
傷の低減を図ることができる。また、前記内壁のフィン
１６ｆに沿って通過する流れの方向を、流体反力によっ
てオリフィス板１６をネジ込み方向に回転させるような
トルクを発生させる方向に変化させるのでオリフィス板
のネジの緩みが防止される。With the above configuration, FIG.
As shown in FIG. 7, the cavitation recovery position 17b and the ring-shaped orifice are formed along the plurality of oblique fins 16f on the inner wall of the ring-shaped orifice plate 16 by the fluid guided and flowing therethrough. The vortex is not generated by the fluid passing through the central portion of the plate 16, and the cavitation recovery position 17a is a position where the former is relatively closer to the orifice plate exit side and the latter is a position relatively far from the orifice plate exit side. And the location is different,
Due to the recovery of the cavitation, the vibration of the pipe and the position of corrosion of the pipe inner wall are dispersed. The fins 16 on the inner wall
The flow of the fluid passing along f serves as a buffer at the cavitation recovery position 17a of the fluid passing through the center. As a result, noise and damage in the pipe can be reduced. Further, since the direction of the flow passing along the fins 16f of the inner wall is changed to a direction in which a torque is generated to rotate the orifice plate 16 in the screwing direction by the fluid reaction force, the screw of the orifice plate is prevented from being loosened. Is done.
【００２８】図７は第６の実施の態様に係る本発明のオ
リフィス板の一実施の形態を流体が流れる管路の中に設
置した状態とその作用を示す斜視図である。本実施の形
態におけるオリフィス板１８は、オリフィス板１８を前
記流体が流れる管路の中にネジ込みによって固定するも
のであって、いくつかの貫通孔１８ａの方向を、ネジが
締まる方向にトルク（矢印イ）が発生するように、流れ
方向に対して角度を持たせている。このように構成する
ことにより、ネジの緩みが防止される。FIG. 7 is a perspective view showing a state in which an embodiment of the orifice plate according to the sixth embodiment of the present invention is installed in a conduit through which a fluid flows, and its operation. The orifice plate 18 in the present embodiment is for fixing the orifice plate 18 into the conduit through which the fluid flows by screwing, and the direction of some through holes 18a is changed by changing the torque (in the direction in which the screw is tightened). The angle is set with respect to the flow direction so that arrow a) occurs. With this configuration, loosening of the screw is prevented.
【００２９】図８は第７の実施の態様に係る本発明のオ
リフィス板の一実施の形態を示し、（ａ）は正面図、
（ｂ）は流体が流れる管路の中に設置した状態とその作
用を示す斜視図である。本実施の形態におけるオリフィ
ス板１９は、オリフィス板１９を前記流体が流れる管路
の中にネジ込みによって固定するものであって、図８に
示すように複数の貫通孔１９ａを有するオリフィス板１
９の上流側の表面に、これに衝突する流体の反力によっ
て、ネジが締まる方向にトルク（矢印ロ）が発生するよ
うに、複数の突起１９ｐを設けている。このように構成
することにより、ネジの緩みが防止される。FIG. 8 shows an embodiment of the orifice plate of the present invention according to the seventh embodiment, in which (a) is a front view,
(B) is a perspective view showing a state where it is installed in a pipeline through which a fluid flows and its operation. The orifice plate 19 in the present embodiment fixes the orifice plate 19 into a pipe through which the fluid flows by screwing, and as shown in FIG. 8, the orifice plate 1 has a plurality of through holes 19a.
A plurality of protrusions 19p are provided on the surface on the upstream side of 9 so that a torque (arrow B) is generated in a direction in which the screw is tightened by a reaction force of the fluid that collides with the surface. With this configuration, loosening of the screw is prevented.
【００３０】なお、上述の実施の形態の全てにおいて、
オリフィス板の材質としてはステンレス鋼を始めとする
各種金属、樹脂、セラミックス、複合材料等を用いるこ
とができる。耐食性やコストを勘案して適当なものを採
用すればよい。In all of the above embodiments,
As the material of the orifice plate, various metals including stainless steel, resins, ceramics, composite materials and the like can be used. An appropriate one may be adopted in consideration of corrosion resistance and cost.
【００３１】[0031]
【発明の効果】本発明のオリフィス板によれば、貫通孔
の形状およびまたは内径の差異により、中心付近の貫通
孔を通過した流体のキャビテーション回復位置と、周辺
付近の貫通孔を通過した流体のキャビテーション回復位
置とが異なるので、キャビテーションの回復にともなう
配管の振動発生や管内壁腐食の位置が分散される。ま
た、周辺付近の第２の貫通孔を通過した流体の流れが、
中心付近の第１の貫通孔を通過した流体のキャビテーシ
ョン回復位置において緩衝材としての役割を果たす。そ
の結果として、騒音および管内損傷の低減を図ることが
できる。According to the orifice plate of the present invention, the cavitation recovery position of the fluid passing through the through hole near the center and the flow rate of the fluid passing through the through hole near the periphery are determined by the difference in shape and / or inner diameter of the through hole. Since the cavitation recovery position is different, the positions of the generation of the vibration of the pipe and the corrosion of the inner wall of the pipe due to the recovery of the cavitation are dispersed. Also, the flow of the fluid passing through the second through hole near the periphery is
At the cavitation recovery position of the fluid that has passed through the first through hole near the center, it functions as a buffer. As a result, noise and damage in the pipe can be reduced.
【図１】 第１または第２の実施の態様に係る本発明
のオリフィス板の一実施の形態の正面図である。FIG. 1 is a front view of an embodiment of an orifice plate according to the first or second embodiment of the present invention.
【図２】 同実施の形態のオリフィス板を流体が流れ
る管路の中に設置した状態とその作用を示す側断面図で
ある。FIG. 2 is a side sectional view showing a state in which the orifice plate of the embodiment is installed in a conduit through which a fluid flows and an operation thereof.
【図３】 第３の実施の態様に係る本発明のオリフィ
ス板の一実施の形態の正面図である。FIG. 3 is a front view of an embodiment of an orifice plate according to a third embodiment of the present invention.
【図４】 同実施の形態のオリフィス板を流体が流れ
る管路の中に設置した状態とその作用を示す斜視図であ
る。FIG. 4 is a perspective view showing a state in which the orifice plate of the embodiment is installed in a conduit through which a fluid flows, and its operation.
【図５】 第４および第５の実施の態様に係る本発明
のオリフィス板と同じ作用・効果を奏する発明の一実施
の形態の正面図である。FIG. 5 is a front view of an embodiment of the invention having the same operation and effect as the orifice plate of the present invention according to the fourth and fifth embodiments.
【図６】 同実施の形態のオリフィス板を流体が流れ
る管路の中に設置した状態とその作用を示す斜視図であ
る。FIG. 6 is a perspective view showing a state in which the orifice plate of the embodiment is installed in a conduit through which a fluid flows and an operation thereof.
【図７】 第６の実施の態様に係る本発明のオリフィ
ス板の一実施の形態を流体が流れる管路の中に設置した
状態とその作用を示す斜視図である。FIG. 7 is a perspective view showing a state in which an embodiment of an orifice plate according to a sixth embodiment of the present invention is installed in a conduit through which a fluid flows, and its operation.
【図８】 第７の実施の態様に係る本発明のオリフィ
ス板の一実施の形態を示し、（ａ）は正面図、（ｂ）は
流体が流れる管路の中に設置した状態とその作用を示す
斜視図である。FIGS. 8A and 8B show an embodiment of an orifice plate according to a seventh embodiment of the present invention, wherein FIG. 8A is a front view, and FIG. FIG.
【図９】 従来の単孔オリフィス板の一例とその作用
を示す側断面図である。FIG. 9 is a side sectional view showing an example of a conventional single-hole orifice plate and its operation.
【図１０】 従来の調節弁内蔵用オリフィス板の一例を
示す側断面図である。FIG. 10 is a side sectional view showing an example of a conventional orifice plate with a built-in control valve.
１０ オリフィス板 １０ａ 第１の貫通孔 １０ｂ 第２の貫通孔 １１ａ，１１ｂ キャビテーション回復位置 １２ オリフィス板 １２ａ 第１の貫通孔 １２ｂ 第２の貫通孔 １３ａ，１３ｂ キャビテーション回復位置 １６ オリフィス板 １６ｆ フィン １７ａ，１７ｂ キャビテーション回復位置 １８ オリフィス板 １８ａ 貫通孔 １９ オリフィス板 １９ａ 貫通孔 １９ｐ 突起 Reference Signs List 10 Orifice plate 10a First through hole 10b Second through hole 11a, 11b Cavitation recovery position 12 Orifice plate 12a First through hole 12b Second through hole 13a, 13b Cavitation recovery position 16 Orifice plate 16f Fin 17a, 17b Cavitation recovery position 18 Orifice plate 18a Through hole 19 Orifice plate 19a Through hole 19p Projection
Claims (1)
路の中に設置されて、その流体に圧力損失を発生させる
オリフィス板であって、中心付近設けられた第１の貫通
孔と周辺付近に設けられた第２の貫通孔との形状および
または内径が異なることを特徴としたオリフィス板。An orifice plate having a plurality of through-holes, installed in a conduit through which a fluid flows, and generating a pressure loss in the fluid, wherein the first orifice plate is provided near a center and the periphery. An orifice plate having a different shape and / or inner diameter from a second through hole provided in the vicinity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31003799A JP3569888B2 (en) | 1999-10-29 | 1999-10-29 | Orifice plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31003799A JP3569888B2 (en) | 1999-10-29 | 1999-10-29 | Orifice plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001124280A true JP2001124280A (en) | 2001-05-11 |
| JP3569888B2 JP3569888B2 (en) | 2004-09-29 |
Family
ID=18000410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31003799A Expired - Fee Related JP3569888B2 (en) | 1999-10-29 | 1999-10-29 | Orifice plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3569888B2 (en) |
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| JP2004101082A (en) * | 2002-09-10 | 2004-04-02 | Denso Corp | Freezing device |
| JP2006255652A (en) * | 2005-03-18 | 2006-09-28 | Kurita Water Ind Ltd | Apparatus for producing pure water |
| JP2008149052A (en) * | 2006-12-20 | 2008-07-03 | Matsushita Electric Works Ltd | Minute bubble generator |
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