JPH04184139A - Critical flow venturi - Google Patents
Critical flow venturiInfo
- Publication number
- JPH04184139A JPH04184139A JP31313990A JP31313990A JPH04184139A JP H04184139 A JPH04184139 A JP H04184139A JP 31313990 A JP31313990 A JP 31313990A JP 31313990 A JP31313990 A JP 31313990A JP H04184139 A JPH04184139 A JP H04184139A
- Authority
- JP
- Japan
- Prior art keywords
- venturi
- throat
- critical flow
- enlarged
- cutting
- 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
- 238000005520 cutting process Methods 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 17
- 238000004804 winding Methods 0.000 claims abstract description 6
- 238000003466 welding Methods 0.000 claims abstract description 4
- 239000007769 metal material Substances 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 5
- 238000004080 punching Methods 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000005070 sampling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
- G01N2001/242—Injectors or ejectors
- G01N2001/244—Injectors or ejectors using critical flow orifices
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、臨界流れ特性を利用して定流量の試料ガスを
採取する等に供されるクリティカルフローベンチュリ（
Ｃｒｉｔｉｃａｌ Ｆｌｏｗ Ｖｅｎｔｕｒｉ；以下、
必要に応じてベンチュリと略称する）の改良技術に関す
る。Detailed Description of the Invention [Industrial Application Field] The present invention relates to a critical flow venturi (critical flow venturi) used for sampling a constant flow rate of sample gas by utilizing critical flow characteristics.
Critical Flow Venturi;Hereinafter,
(abbreviated as Venturi when necessary).
第４図に示すように、クリティカルフローベンチュリ２
１は、接続用のフランジ２２が連設された導入部２３と
、スロート部２４、及び、配管接続用のフランジ２５が
連設された圧力回復用の拡大部２６から成り、従来では
、当該ベンチュリ２１の全体を金属材の切削加工によっ
て成形している。As shown in Figure 4, critical flow venturi 2
1 consists of an introduction part 23 to which a flange 22 for connection is connected, a throat part 24, and an enlarged part 26 for pressure recovery to which a flange 25 for connection to piping is connected. 21 is entirely formed by cutting a metal material.
そして機能面から、前記導入部２３とスロート部２４近
傍の内面は、縦断面形状で円弧になる湾曲面Ｓ１に形成
され、前記拡大部２６のスロート部２４近傍を除く部分
２６ａの内面はシンプルなテーパー内面Ｓ！に形成され
ている。From a functional point of view, the inner surfaces near the introduction section 23 and the throat section 24 are formed into a curved surface S1 that is an arc in longitudinal section, and the inner surface of the portion 26a of the enlarged section 26 excluding the vicinity of the throat section 24 is a simple curved surface S1. Tapered inner surface S! is formed.
ところで従来は、切削加工面で許される限度内で可及的
に各部の厚みを薄く（５〜８−一）してベンチュリ２１
を作製しているが、流量が３ ｍ’／＋＋ｉｎといった
小流量のもので、全長が約３００ｍ−で重量が約５ｋｇ
で、流量が３００ｍ’／ｌ１ｉｎといった大流量のもの
になると、全長が約１５００＋ｗ−で且つ重量が約５０
０−にも及ぶもので、重量物であることから加工上の取
り扱いが非常に困難であるばかりか、金属材を切削加工
するための特殊な大型の加工機を要し、かつ、加工工数
も多大であって、製作コストが極端に高くつく問題があ
った。By the way, in the past, the venturi 21 was made by making each part as thin as possible (5 to 8-1) within the limit allowed by the cutting surface.
However, the flow rate is small, such as 3 m'/++in, the total length is about 300 m, and the weight is about 5 kg.
So, if the flow rate is large such as 300m'/l1in, the total length will be about 1500+w- and the weight will be about 50m'/l1in.
Since it is a heavy object, it is very difficult to handle during processing, and it also requires a special large-scale processing machine for cutting metal materials, and the processing time is also high. There was a problem in that the manufacturing cost was extremely high.
あるいは、容量が更に大きくなると加工面から製作する
こと自体が不能となり、この場合、小容量の複数個のベ
ンチエリを並置して使用せざるを得ないのであるが、経
済面ならびにスペース面での問題を伴うものであった。Alternatively, if the capacity becomes even larger, it becomes impossible to manufacture from the machined surface itself, and in this case, multiple small-capacity benches must be used side by side, but this poses problems in terms of economy and space. It was accompanied by
また、上記のベンチュリ２１の定流量はスロート部２４
の径によって決定されるものであって、このベンチエリ
２１を例えば試料ガス採取装置などに組込んだ場合、流
量を変更する場合にはベンチュリ２１の全体を取り換え
る必要があるが、上記したようにベンチュリ自体が相当
な重量物であることから、当該ベンチュリの取り換え作
業に多大の労力と時間を要するものであった。Further, the constant flow rate of the venturi 21 is determined by the throat portion 24.
This is determined by the diameter of the venturi 21, and when the venturi 21 is incorporated into, for example, a sample gas sampling device, it is necessary to replace the entire venturi 21 when changing the flow rate. Since the venturi itself is quite heavy, replacing the venturi requires a great deal of effort and time.
本発明は、前記拡大部のスロート部近傍を除く筒部分の
内面がシンプルなテーパー内面に形成されている点に着
目して成されたものであって、か＼る特異な形状を旨く
利用した簡単な改良技術によって、上記従来の欠点を解
消することを目的としている。The present invention was made by paying attention to the fact that the inner surface of the cylindrical portion of the enlarged portion except for the vicinity of the throat portion is formed into a simple tapered inner surface, and makes effective use of this unique shape. The purpose of this invention is to eliminate the above-mentioned drawbacks of the conventional technology through a simple improvement technique.
〔課題を解決するための手段］
上酷の目的を達成するために本発明は、導入部とスロー
ト部および圧力回復用の拡大部から成るクリティカルフ
ローベンチュリにおいて、前記拡大部のスロート部近傍
部分と前記スロート部および導入部を、金属材の切削加
工によって一体成形し、前記拡大部のスロート部近傍部
分を除くテーパー筒部分を金属板の板巻き加工によって
成形し、かつ、当該テーパー筒部分を溶接によって前記
拡大部のスロート部近傍部分に一体化させた点に特徴が
ある。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a critical flow venturi consisting of an introduction section, a throat section, and an enlarged section for pressure recovery, in which a portion near the throat section of the enlarged section and a The throat part and the introduction part are integrally formed by cutting a metal material, the tapered cylindrical part other than the part near the throat part of the enlarged part is formed by sheet winding of a metal plate, and the tapered cylindrical part is welded. It is characterized in that it is integrated in the vicinity of the throat portion of the enlarged portion.
即ち、ベンチエリ全体からみて大部分を占める拡大部の
うち、スロート部近傍を除く内面がシンプルなテーパー
内面の部分を金属板製とし、がっ、内面形状の関係から
、切削加工が必要な残りのベンチュリ部分を金属材の削
り出し一体成形品としたもので、ベンチエリ全体の軽量
化と切削加工の工数低減が達成される。In other words, among the enlarged parts that account for most of the entire bench area, the tapered inner surface, which has a simple inner surface except for the vicinity of the throat part, is made of metal plate, and the remaining part, which requires cutting due to the inner shape, is made of metal plate. The venturi part is machined from metal and is integrally molded, reducing the weight of the entire bench and the number of man-hours required for cutting.
以下、本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below based on the drawings.
第１図は本発明による一実施例のクリティカルフローベ
ンチュリｌを示し、第２図はそのベンチュリＩを組み込
んだ試料ガス採取装置の全体を示すものであって、前記
ベンチュリｌの上流側には金属製のベローズ２と配管３
が接続され、下流側には接続用配管４を介してブロア５
が連通連結されている。FIG. 1 shows a critical flow venturi I according to an embodiment of the present invention, and FIG. 2 shows the entire sample gas sampling device incorporating the venturi I, in which a metal is provided on the upstream side of the venturi I. bellows 2 and piping 3
is connected, and a blower 5 is connected to the downstream side via a connecting pipe 4.
are connected in series.
上記のベンチュリ１は全体がステンレス製であって、前
記ベローズ２を接続するためのフランジ６が連設された
導入部７と、スロート部８、及び、接続用配管４に対す
るフランジ９が取り付けられた圧力回復用の拡大部ｌＯ
から成る。The venturi 1 is entirely made of stainless steel, and is equipped with an introduction part 7 having a flange 6 for connecting the bellows 2, a throat part 8, and a flange 9 for the connection pipe 4. Expanded section lO for pressure recovery
Consists of.
そして、この内の縦断面形状で内面が円弧の湾曲面Ｓ１
に形成されるところの、前記導入部７とスロート部８お
よび前記拡大部１０のスロート部８近傍部分１０ａを、
金属材の切削加工によって一体成形し、かつ、前記部分
１０ａを除く形状的にシンプルなテーパー内面Ｓｔに形
成されるテーパー筒部分１０ｂを、金属板の板巻き加工
によって成形すると共に、前記部分１０ａの大径端部に
テーパー筒部分１０ｂを差し込んで、両面Ｓ、、 Ｓ、
を滑らかに連ねる状態で前記テーパー筒部分１０ｂを前
記部分１０ａに溶接して一体化させる一方、前記テーパ
ー筒部分１０ｂの大径側端部の外面に、金属材を切削加
工して成るフランジ９を溶接して、クリティカルフロー
ベンチュリ１が作製されている。Among these, a curved surface S1 having a vertical cross-sectional shape and an inner surface having a circular arc
The introduction portion 7, the throat portion 8, and the portion 10a of the enlarged portion 10 near the throat portion 8, which are formed in
The tapered cylindrical portion 10b is integrally formed by cutting a metal material and is formed on the tapered inner surface St, which is simple in shape except for the portion 10a, and is formed by winding a metal plate. Insert the tapered cylindrical portion 10b into the large diameter end, and both sides S,, S,
While the tapered cylindrical portion 10b is welded and integrated with the portion 10a in a state in which they are smoothly connected, a flange 9 formed by cutting a metal material is attached to the outer surface of the large diameter end of the tapered cylindrical portion 10b. A critical flow venturi 1 is manufactured by welding.
上記の構成によれば、ベンチュリ全体からみて大部分を
占める拡大部１０のうち、スロート部８近傍部分１０ａ
を除（テーパー筒部分１０ｂを金属板製としたことで、
ベンチュリ全体の軽量化が達成される。According to the above configuration, the portion 10a near the throat portion 8 of the enlarged portion 10 that occupies most of the entire venturi.
(by making the tapered cylinder part 10b a metal plate,
The overall weight of the venturi is reduced.
具体的には、金属板の板厚が大きく影響するものの、そ
の板厚を１ 、５ｍｍにして作製した小容量のベンチュ
リ１の場合は、ベンチュリ全体を切削加工によって作製
する場合に比べて重量が約１７３であり、大容量のベン
チュリｌの場合で約１７２であった。Specifically, although the thickness of the metal plate has a large effect, a small-capacity venturi 1 made with a thickness of 1.5 mm weighs less than a case where the entire venturi is made by cutting. It was about 173, and about 172 in the case of a large capacity venturi.
また、前記導入部７とスロート部８および前記拡大部ｌ
Ｏのスロート部８近傍部分１０ａだけを金属材の切削加
工で一体成形するものであるから、切削加工の大幅な工
数低減が達成され且つ切削加工機にしても小型汎用のも
ので済み、延いては、ベンチュリｌの製作コストを大幅
に低減させることができる。Moreover, the introduction part 7, the throat part 8 and the enlarged part l
Since only the portion 10a near the throat portion 8 of the O is integrally formed by cutting the metal material, a significant reduction in the number of man-hours for cutting can be achieved, and the cutting machine can be small and general-purpose. can significantly reduce the manufacturing cost of the venturi l.
それでいて、ベンチュリ１そのものの内面形状は、要求
される所定の臨界流れ特性が得られるように形成される
ので、切削加工による一体成形のベンチュリと変わりの
ない圧力回復と流量安定精度が得られる。However, since the inner surface shape of the venturi 1 itself is formed to obtain the required predetermined critical flow characteristics, pressure recovery and flow rate stability accuracy can be obtained that is the same as that of a venturi that is integrally formed by cutting.
尚、前記拡大部１０のテーパー筒部分１０ｂを金属板製
としたことで、その分だけベンチュリ１の質量が小さく
なり、ガスの流れに伴ってベンチュリ１が振動音を発す
る懸念があるならば、第３図に示すように、板巻き加工
されたテーパー筒部分１０ｂの外面部に例えば両面テー
プ１１を介して鉛板１２を貼着して、実質的にテーパー
筒部分１０ｂの質量を大きくし、制振ならびに遮音を図
ることが望ましい。Furthermore, by making the tapered cylindrical portion 10b of the enlarged portion 10 made of a metal plate, the mass of the venturi 1 is reduced by that amount, and there is a concern that the venturi 1 may generate vibration noise due to the flow of gas. As shown in FIG. 3, a lead plate 12 is adhered to the outer surface of the tapered cylinder portion 10b, which has been wound into a plate, via double-sided tape 11, for example, to substantially increase the mass of the tapered cylinder portion 10b, It is desirable to suppress vibration and sound insulation.
以上説明したように本発明は、ベンチュリ全体からみて
大部分を占める拡大部のうち、前記拡大部のスロート部
近傍を除く筒部分の内面がシンプルなテーパー内面に形
成されている点に着目して成されたものであうで、か−
る特異な形状を旨く利用して、当該部分を金属板の板巻
き加工によって成形し、かつ、導入部とスロート部およ
び拡大部のスロート部近傍部分だけを金属材の切削加工
によって一体成形し、これらを溶接によって一体化させ
てベンチュリを構成したものであって、切削加工を要す
る部分が非常に小さく且つ軽量になったことで、加工上
の取り扱いが優れたものになると共に切削加工機にして
も小型汎用のもので済むようになり、延いては、従来製
作することが不能であったような容量的に大なるベンチ
ュリの製作も容易に可能となり、更に、流量変更のため
のベンチエリの取り換え作業も簡単かつ容易に行うこと
ができる。As explained above, the present invention focuses on the fact that, of the enlarged part that occupies most of the entire venturi, the inner surface of the cylindrical part excluding the vicinity of the throat part of the enlarged part is formed into a simple tapered inner surface. Is it filled with what has been accomplished?
Taking advantage of the unique shape of the metal plate, the part is formed by winding a metal plate, and only the introduction part, the throat part, and the enlarged part near the throat part are integrally formed by cutting the metal material. These are integrated by welding to form a venturi, and the parts that require cutting are extremely small and lightweight, making it easier to handle during processing and making it easier to use with cutting machines. It is now possible to easily manufacture a venturi with a large capacity, which was previously impossible to manufacture, and it is also possible to replace the venturi to change the flow rate. Work can be done easily and easily.
しかも、テーパー筒部分を金属板製としたことに加えて
切削加工の工数が大幅に低減されたことで、ベンチュリ
の製作コストを大幅にダウンさせることができるように
なり、全体として、特異な形状を旨く利用した簡単な改
良技術によって、ベンチュリの軽量化とコストダウンを
達成できるに至り、更には、容量的に大なるベンチュリ
の製作も可能ならしめ得るに至ったのである。Moreover, in addition to making the tapered cylinder part a metal plate, the number of cutting steps has been significantly reduced, making it possible to significantly reduce the manufacturing cost of the venturi, resulting in a unique shape as a whole. Through a simple improvement technique that makes good use of this, it has become possible to reduce the weight and cost of the venturi, and it has also become possible to manufacture a venturi with a large capacity.
図面は本発明の実施例を示し、第１図は右半分を断面し
たクリティカルフローベンチェリノ全体図、第２図はそ
のベンチュリを組み込んだ試料ガス採取装置の全体図、
第３図は別実施例のクリティカルフローベンチュリの右
半分を断面した全体図、第４図は従来例のクリティカル
フローベンチエリの右半分を断面した全体図である。
７・・・導入部、８・・・スロート部、１０・・・拡大
部、１０ａ・・・拡大部のスロート部近傍部分、ｌＯｂ
・・・テーパー筒部分、１２・・・鉛板。
出 願 人 株式会社 堀場製作所代 理 人
弁理士 藤本英夫
７・・・導入部
８・・・スロート部
１０・・・拡大部
１０ａ・・・拡大部のスロート部近傍部分１０ｂ・・・
テーパー筒部分
１２・・・鉛板
第１図
第３図
第４図The drawings show an embodiment of the present invention, and FIG. 1 is an overall view of the critical flow venturi with the right half sectioned, and FIG. 2 is an overall view of the sample gas sampling device incorporating the venturi.
FIG. 3 is an overall cross-sectional view of the right half of a critical flow venturi according to another embodiment, and FIG. 4 is an overall cross-sectional view of the right half of a conventional critical flow venturi. 7... Introduction part, 8... Throat part, 10... Enlarged part, 10a... Portion near the throat part of the enlarged part, lOb
...Tapered cylinder part, 12...Lead plate. Applicant: Horiba Ltd. Agent
Patent Attorney Hideo Fujimoto 7... Introduction section 8... Throat section 10... Enlarged section 10a... Portion near the throat section of the enlarged section 10b...
Tapered cylinder portion 12...Lead plate Fig. 1 Fig. 3 Fig. 4
Claims (2)
ら成るクリティカルフローベンチュリにおいて、前記拡
大部のスロート部近傍部分と前記スロート部および導入
部を、金属材の切削加工によって一体成形し、前記拡大
部のスロート部近傍部分を除くテーパー筒部分を金属板
の板巻き加工によって成形し、かつ、当該テーパー筒部
分を溶接によって前記拡大部のスロート部近傍部分に一
体化させて成ることを特徴とするクリティカルフローベ
ンチュリ。(1) In a critical flow venturi consisting of an introduction part, a throat part, and an enlarged part for pressure recovery, the part near the throat part of the enlarged part, the throat part, and the introduction part are integrally formed by cutting a metal material, and the A tapered cylindrical portion of the enlarged portion other than a portion near the throat portion is formed by winding a metal plate, and the tapered cylindrical portion is integrated with the portion of the enlarged portion near the throat portion by welding. critical flow venturi.
外面部に鉛板を貼着してあることを特徴とする請求項（
１）に記載のクリティカルフローベンチュリ。(2) A claim characterized in that a lead plate is attached to the outer surface of the tapered cylinder portion formed by plate winding.
Critical flow venturi described in 1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2313139A JP2514467B2 (en) | 1990-11-19 | 1990-11-19 | Critical Flow Venturi |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2313139A JP2514467B2 (en) | 1990-11-19 | 1990-11-19 | Critical Flow Venturi |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04184139A true JPH04184139A (en) | 1992-07-01 |
| JP2514467B2 JP2514467B2 (en) | 1996-07-10 |
Family
ID=18037568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2313139A Expired - Lifetime JP2514467B2 (en) | 1990-11-19 | 1990-11-19 | Critical Flow Venturi |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2514467B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8246344B1 (en) * | 2003-07-29 | 2012-08-21 | Samuel Schrock | Gas lamp |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5035768A (en) * | 1973-08-02 | 1975-04-04 | ||
| JPS5087362A (en) * | 1973-12-03 | 1975-07-14 | ||
| JPS63146717U (en) * | 1987-03-17 | 1988-09-28 |
-
1990
- 1990-11-19 JP JP2313139A patent/JP2514467B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5035768A (en) * | 1973-08-02 | 1975-04-04 | ||
| JPS5087362A (en) * | 1973-12-03 | 1975-07-14 | ||
| JPS63146717U (en) * | 1987-03-17 | 1988-09-28 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8246344B1 (en) * | 2003-07-29 | 2012-08-21 | Samuel Schrock | Gas lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2514467B2 (en) | 1996-07-10 |
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