JP4253073B2 - Pipe connection connector for gas measurement - Google Patents

Pipe connection connector for gas measurement Download PDF

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Publication number
JP4253073B2
JP4253073B2 JP14229699A JP14229699A JP4253073B2 JP 4253073 B2 JP4253073 B2 JP 4253073B2 JP 14229699 A JP14229699 A JP 14229699A JP 14229699 A JP14229699 A JP 14229699A JP 4253073 B2 JP4253073 B2 JP 4253073B2
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Japan
Prior art keywords
diameter pipe
pipe
small
diameter
connector
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JP2000329272A (en
Inventor
勉 大家
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Horiba Ltd
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Horiba Ltd
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    • 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
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/04—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts using additional rigid rings, sealing directly on at least one pipe end, which is flared either before or during the making of the connection

Description

【０００１】
【発明の属する技術分野】
この発明は、例えば自動車排ガスなどの煤粒子を含むガスの測定に用いられるパイプ接続用コネクタに関する。
【０００２】
【従来の技術】
例えば、ディーゼルエンジンなどの内燃機関から排出されるガス中には、煤などの微粒子が含まれている。そして、前記ガスの成分元素などを測定する装置のサンプリングラインにおいて、上流側の大径パイプとガス測定装置が取り付けられた下流側の小径パイプとを接続する部分には、従来、図３に示すような構造のコネクタが用いられていた。すなわち、従来のコネクタＤ’は、コネクタ本体１４の鍔部１５よりも上流側の大径部１６の内部に大径パイプ７が、鍔部１５よりも下流側の小径部１７の内部に小径パイプ８がそれぞれ挿入され、それら大径部１６外側の雄ねじ部１６ａ及び小径部１７外側の雄ねじ部１７ａへの袋ナット１３及び１３´の螺着により大径パイプ７及び小径パイプ８の外側にそれぞれ設けられているリング形状のフロントフェルール９，９´およびバックフェルール１０，１０´が大径パイプ７及び小径パイプ８に付勢されて大径パイプ７及び小径パイプ８がコネクタ本体１４に固定されて両パイプ７，８が接続されており、大径パイプ７の内部を流れてきたガスが、コネクタ本体１４の内部通路１８´を経て、小径パイプ８の内部に至るように構成されている。また、コネクタ本体１４の内部通路１８´の径（以下内径という）は、小径パイプ８の内径とほぼ等しくなるように構成されていた。
【発明が解決しようとする課題】
【０００３】
しかし、上記の構成では、コネクタＤ’のコネクタ本体１４の内径が大径パイプ７の内径よりも小さくなることから、大径パイプ７の内部からコネクタＤ’の内側に向かってガスが流れる通路中に段差が形成されることになり、その段差部分１９に測定ガス中の煤粒子が付着する可能性がある。そして、前記煤粒子が段差部分１９にある程度付着した状態になると、少しの衝撃などで、付着した煤粒子が一斉に下流側のガス測定装置に流れ、測定結果に悪影響を与えるため、測定装置自体の信頼性が低下することとなる。
【０００４】
この発明は上述の事柄に留意してなされたもので、その目的は、煤粒子の付着を防止して、測定精度及び測定装置の信頼性を向上させることが可能なガス測定用のパイプ接続用コネクタを提供することにある。
【０００５】
【課題を解決するための手段】
上記目的を達成するために、この発明に係るガス測定用のパイプ接続用コネクタは、煤粒子を含むガスが流れる上流側の大径パイプとガス測定装置が取り付けられた下流側の小径パイプとを接続するためのガス測定用のパイプ接続用コネクタであって、軸方向の前後両側に大径部及び小径部が連設され、それら大径部及び小径部の内部に前記大径パイプ及び小径パイプの挿入部が形成されているとともに、外側にそれぞれ雄ねじ部を有するコネクタ本体と、前記大径パイプ及び小径パイプの外側に設けられて前記コネクタ本体の両雄ねじ部に螺着される袋ナットと、前記大径パイプ及び小径パイプの外側にそれぞれ設けられて前記袋ナットの螺着に伴い大径パイプ及び小径パイプに付勢されて大径パイプ及び小径パイプをコネクタ本体に固定するリング形状のフェルールとを備えてなり、前記コネクタ本体の大径パイプ挿入部と小径パイプ挿入部の間に位置する内部通路が下流側ほど先細まりとなる形状に形成されているとともに、前記前後両側のパイプ挿入部には、これら挿入部に挿入された大径パイプ及び小径パイプの内径が先細まり形状の内部通路の上流端及び下流端の内径とそれぞれ一致するような段差が設けられており、大径パイプと小径パイプとの接続状態において、大径パイプから小径パイプへと至るまでのガス通路に段差を生じないように構成したことを特徴としている。
【０００６】
上記の構成により、煤粒子の付着を防止することが可能なパイプ接続用コネクタの提供が可能となる。
【０００７】
【発明の実施の形態】
以下、この発明の実施例を、図を参照しながら説明する。
図１は、本発明の一実施例に係るガス測定用のパイプ接続用コネクタＤを用いて行う測定方法を概略的に示す図である。
４は、内燃機関であるディーゼルエンジンを搭載したディーゼル車１からの排ガスを導入路２から直接導入し、この排ガスをもう１つの導入路３から取り込んだ希釈ガス（例えばヘリウムガス）Ａによって希釈する希釈トンネルであり、その希釈トンネル４の下流部には、排ガス採取用ライン５を介して測定装置６が接続されている。そして、前記排ガス採取用ライン５において、上流側の大径パイプ７（図２参照）と下流側の小径パイプ８（図２参照）とを接続するために、パイプ接続用コネクタＤ（図２参照）が使用される。
【０００８】
図２は、上記パイプ接続用コネクタＤの構成を概略的に示す一部切断縦断面図であり、以下にパイプ接続用コネクタＤの構成について説明する。
【０００９】
大径パイプ７の外側の適宜の位置にはフロントフェルール９およびバックフェルール１０が、そして小径パイプ８の外側の適宜の位置にはフロントフェルール９’およびバックフェルール１０’がそれぞれ設けられている。
【００１０】
前記フロントフェルール９、９’はリング形状をしており、外側には前端に向かって細くなるテーパ面が形成されている。また、前記バックフェルール１０、１０’もリング形状をしているが、外側にはテーパ面ではなく、前側には大径部分１１、１１’が、そして後側には小径部分１２、１２’がそれぞれ設けられている。さらに、フロントフェルール９およびバックフェルール１０の内径は、大径パイプ７の外径とほぼ同じ大きさをしており、フロントフェルール９’およびバックフェルール１０’の内径は、小径パイプ８の外径とほぼ同じ大きさをしている。
【００１１】
前記バックフェルール１０およびフロントフェルール９は、上流側からこの順に、そしてそれぞれの前端が下流側に向かうように固定されており、また、フロントフェルール９’およびバックフェルール１０’は、上流側からこの順に、そしてそれぞれの前端が上流側に向かうように固定されている。
【００１２】
また、前記大径パイプ７の外側には、内側に雌ねじ部１３ａを有する袋ナット１３も設けられている。そして、前記小径パイプ８の外側にも、内側に雌ねじ部１３’ａを有する袋ナット１３’が同様に設けられている。
【００１３】
１４はコネクタ本体であり、鍔部１５と、この鍔部１５の前側に連設された大径部１６と、鍔部１５の後側に連設された小径部１７とから構成されている。そして、外側に雄ねじ部１６ａを有する大径部１６の内部には、前記大径パイプ７の挿入部１６ｂが形成され、外側に雄ねじ部１７ａを有する小径部１７の内部には、前記小径パイプ８の挿入部１７ｂが形成されている。
【００１４】
上記の構成からなるパイプ接続用コネクタＤを用いて大径パイプ７と小径パイプ８を接続するには、コネクタ本体１４の大径部１６の挿入部１６ｂおよび小径部１７の挿入部１７ｂに、それぞれ大径パイプ７および小径パイプ８を挿入し、袋ナット１３、１３’をそれぞれ雄ねじ部１６ａおよび雄ねじ部１７ａに螺着させるだけでよい。この螺着によって、前記フロントフェルール９、バックフェルール１０と、前記フロントフェルール９’、バックフェルール１０’が、それぞれ内側に付勢されて（かしめられて）、大径パイプ７及び小径パイプ８の外周面に圧接され、大径パイプ７と小径パイプ８がコネクタ本体１４に固定される。
【００１５】
そして、前記コネクタ本体１４の前記大径パイプ７の挿入部１６ｂと前記小径パイプ８の挿入部１７ｂの間に位置する内部通路１８が、下流側ほど先細まりとなる形状（たとえば円錐台形状）に形成されているとともに、前記前後両側のパイプ挿入部１６ｂ，１７ｂには、これら挿入部１６ｂ，１７ｂ挿入された大径パイプ７及び小径パイプ８の内径が前記内部通路１８の上流端及び下流端の内径とそれぞれ一致するように、各パイプ７，８の肉厚に相当する段差が設けられており、これによって、大径パイプ７と小径パイプとの接続状態において、大径パイプ７から小径パイプ８へと至るまでのガス通路に段差がほとんど生じず、煤粒子を含んだガスが流通しても、煤粒子が付着するのを防止することができる。
【００１６】
【発明の効果】
以上説明したように、本発明に係るガス測定用のパイプ接続用コネクタは、コネクタ本体を介して上流側の大径パイプと下流側の小径パイプとを接続した状態において、コネクタ本体の大径パイプ挿入部と小径パイプ挿入部の間に位置する内部通路が下流側ほど先細まりとなる形状で接続状態において、前記大径パイプから小径パイプへと至るまでのガス通路に段差を生じないように構成されているので、煤粒子を含むガスの測定時に煤粒子がコネクタ本体の内部通路部分に付着することを防止して、煤粒子を含むガスの流れを定常化でき、測定精度及び測定装置の信頼性を向上させることが可能となる。
【図面の簡単な説明】
【図１】 本発明の一実施例に係るガス測定用のパイプ接続用コネクタを用いて行う測定方法を概略的に示す図である。
【図２】 上記パイプ接続用コネクタの構成を概略的に示す一部切断縦断面図である。
【図３】 従来のパイプ接続用コネクタの構成を概略的に示す一部切断縦断面図である。
【符号の説明】
７…大径パイプ、８…小径パイプ、９，９´，１０，１０´…フェルール、１３，１３ ´…袋ナット、１４…コネクタ本体、１５…鍔部、１６…大径部、１７…小径部、１６ａ，１７ａ…雄ねじ部、１６ｂ，１７ｂ…パイプ挿入部、１８…内部通路、Ｄ…パイプ接続用コネクタ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connector for pipe connection used for measuring gas containing soot particles such as automobile exhaust gas.
[0002]
[Prior art]
For example, gas discharged from an internal combustion engine such as a diesel engine contains particulates such as soot. In the sampling line of the apparatus for measuring the constituent elements of the gas and the like, the portion connecting the upstream large-diameter pipe and the downstream small-diameter pipe to which the gas measuring device is attached is conventionally shown in FIG. A connector having such a structure has been used. That is, the conventional connector D ′ includes a large-diameter pipe 7 inside the large-diameter portion 16 upstream of the flange portion 15 of the connector body 14 and a small-diameter pipe inside the small- diameter portion 17 downstream of the flange portion 15. 8 are respectively inserted and provided outside the large-diameter pipe 7 and the small-diameter pipe 8 by screwing the cap nuts 13 and 13 'to the male screw portion 16a outside the large-diameter portion 16 and the male screw portion 17a outside the small-diameter portion 17, respectively. The ring-shaped front ferrules 9, 9 'and back ferrules 10, 10' are urged by the large diameter pipe 7 and the small diameter pipe 8, and the large diameter pipe 7 and the small diameter pipe 8 are fixed to the connector body 14 so that both pipe 7,8 is connected, a gas that has flowed inside the large-diameter pipe 7, through the inner passage 18 'of the connector body 14, and is configured to reach the interior of the small diameter pipe 8 Further, the diameter (hereinafter referred to as the inner diameter) of the internal passage 18 ′ of the connector main body 14 is configured to be substantially equal to the inner diameter of the small diameter pipe 8.
[Problems to be solved by the invention]
[0003]
However, in the above configuration, since the inner diameter of the connector main body 14 of the connector D ′ is smaller than the inner diameter of the large-diameter pipe 7, the gas flows from the inside of the large-diameter pipe 7 toward the inside of the connector D ′. As a result, a soot particle in the measurement gas may adhere to the step portion 19. When the soot particles are attached to the stepped portion 19 to some extent, the attached soot particles flow to the downstream gas measuring device all at once with a slight impact or the like and adversely affect the measurement result. This will reduce the reliability.
[0004]
The present invention has been made in consideration of the above-mentioned matters, and its object is to connect a pipe for gas measurement capable of preventing adhesion of soot particles and improving measurement accuracy and reliability of the measurement apparatus . To provide a connector.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a pipe connector for gas measurement according to the present invention comprises an upstream large-diameter pipe through which gas containing soot particles flows and a downstream small-diameter pipe to which a gas measuring device is attached. A connector for connecting a pipe for gas measurement for connection , wherein a large-diameter portion and a small-diameter portion are continuously provided on both front and rear sides in the axial direction, and the large-diameter pipe and the small-diameter pipe are disposed inside the large-diameter portion and the small-diameter portion. A connector body having a male thread portion on the outside, a cap nut provided on the outside of the large diameter pipe and the small diameter pipe and screwed to both male thread portions of the connector body, Provided on the outside of the large-diameter pipe and small-diameter pipe, respectively, and energized by the large-diameter pipe and small-diameter pipe as the cap nut is screwed to fix the large-diameter pipe and small-diameter pipe to the connector body. That it and a ferrule ring-shaped, with an internal passage located between the large-diameter pipe insertion portion and the small diameter pipe insertion portion of said connector body is formed in a shape which is Mari tapered toward the downstream side, the front and rear The pipe insertion portions on both sides are provided with steps so that the inner diameters of the large-diameter pipe and the small-diameter pipe inserted into these insertion portions coincide with the inner diameters of the tapered inner passage at the upstream end and the downstream end, respectively. In the connection state between the large diameter pipe and the small diameter pipe, the gas passage from the large diameter pipe to the small diameter pipe is configured not to have a step .
[0006]
With the above configuration, it is possible to provide a connector for pipe connection that can prevent adhesion of soot particles.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram schematically illustrating a measurement method performed using a pipe connection connector D for gas measurement according to an embodiment of the present invention.
4 directly introduces exhaust gas from a diesel vehicle 1 equipped with a diesel engine, which is an internal combustion engine, from an introduction path 2 and dilutes the exhaust gas with a diluent gas (for example, helium gas) A taken in from another introduction path 3. It is a dilution tunnel, and a measuring device 6 is connected to the downstream portion of the dilution tunnel 4 via an exhaust gas collection line 5. In the exhaust gas collecting line 5, in order to connect the upstream large-diameter pipe 7 (see FIG. 2) and the downstream small-diameter pipe 8 (see FIG. 2), a pipe connection connector D (see FIG. 2). ) Is used.
[0008]
FIG. 2 is a partially cut longitudinal sectional view schematically showing the configuration of the pipe connection connector D. The configuration of the pipe connection connector D will be described below.
[0009]
A front ferrule 9 and a back ferrule 10 are provided at appropriate positions outside the large diameter pipe 7, and a front ferrule 9 'and a back ferrule 10' are provided at appropriate positions outside the small diameter pipe 8, respectively.
[0010]
The front ferrules 9 and 9 'have a ring shape, and a tapered surface that is narrowed toward the front end is formed on the outside. The back ferrules 10 and 10 'are also ring-shaped, but are not tapered on the outside, large diameter portions 11 and 11' on the front side, and small diameter portions 12 and 12 'on the rear side. Each is provided. Further, the inner diameters of the front ferrule 9 and the back ferrule 10 are substantially the same as the outer diameter of the large-diameter pipe 7, and the inner diameters of the front ferrule 9 ′ and the back ferrule 10 ′ are the same as the outer diameter of the small-diameter pipe 8. They are almost the same size.
[0011]
The back ferrule 10 and the front ferrule 9 are fixed in this order from the upstream side, and their front ends are directed to the downstream side, and the front ferrule 9 ′ and the back ferrule 10 ′ are in this order from the upstream side. , And each front end is fixed so as to go upstream.
[0012]
Further, a cap nut 13 having an internal thread portion 13a on the inside is also provided on the outside of the large-diameter pipe 7. A cap nut 13 ′ having an internal thread portion 13 ′ a on the inside is also provided on the outside of the small diameter pipe 8.
[0013]
Reference numeral 14 denotes a connector main body, which includes a flange portion 15, a large-diameter portion 16 connected to the front side of the flange portion 15, and a small-diameter portion 17 connected to the rear side of the flange portion 15. An insertion portion 16b of the large-diameter pipe 7 is formed inside the large-diameter portion 16 having the external thread portion 16a on the outside, and the small-diameter pipe 8 is disposed inside the small-diameter portion 17 having the external thread portion 17a on the outside. The insertion portion 17b is formed .
[0014]
In order to connect the large-diameter pipe 7 and the small-diameter pipe 8 using the connector D for pipe connection having the above-described configuration, the insertion portion 16b of the large-diameter portion 16 and the insertion portion 17b of the small-diameter portion 17 of the connector body 14 are respectively connected. It is only necessary to insert the large-diameter pipe 7 and the small-diameter pipe 8 and screw the cap nuts 13 and 13 'to the male screw portion 16a and the male screw portion 17a, respectively. By this screwing, the front ferrule 9 and the back ferrule 10 and the front ferrule 9 ′ and the back ferrule 10 ′ are respectively urged (caulked) inward, and the outer circumferences of the large diameter pipe 7 and the small diameter pipe 8 The large-diameter pipe 7 and the small-diameter pipe 8 are fixed to the connector body 14 by being pressed against the surface .
[0015]
The interior passage 18, a rounding tapered toward the lower stream side shape (e.g. truncated cone shape) located between the insertion portion 17b of the insertion portion 16b and the small diameter pipe 8 of the large-diameter pipe 7 of the connector body 14 And the inner diameters of the large-diameter pipe 7 and the small-diameter pipe 8 inserted into the insertion sections 16b and 17b are the upstream end and the downstream end of the internal passage 18, respectively. A step corresponding to the wall thickness of each of the pipes 7 and 8 is provided so as to coincide with the inner diameter of each of the pipes 7 and 8, so that when the large-diameter pipe 7 and the small-diameter pipe are connected, the large-diameter pipe 7 is connected to the small-diameter pipe. Steps hardly occur in the gas passage leading up to 8, and even when gas containing soot particles flows, it is possible to prevent soot particles from adhering.
[0016]
【The invention's effect】
As described above, the pipe connector for gas measurement according to the present invention is a large-diameter pipe of the connector body in a state where the upstream large-diameter pipe and the downstream small-diameter pipe are connected via the connector body. The internal passage located between the insertion portion and the small-diameter pipe insertion portion is configured so that the downstream side is tapered so that there is no step in the gas passage from the large-diameter pipe to the small-diameter pipe. Therefore , it is possible to prevent the soot particles from adhering to the internal passage portion of the connector body when measuring the gas containing soot particles, and to stabilize the flow of the gas containing soot particles, and to improve the measurement accuracy and reliability of the measuring device. It becomes possible to improve the property .
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a measurement method performed using a pipe connection connector for gas measurement according to an embodiment of the present invention.
FIG. 2 is a partially cut longitudinal sectional view schematically showing a configuration of the pipe connection connector.
FIG. 3 is a partially cut longitudinal sectional view schematically showing a configuration of a conventional pipe connection connector.
[Explanation of symbols]
7 ... large diameter pipe, 8 ... small diameter pipe, 9, 9 ', 10, 10' ... ferrule, 13, 13 '... cap nut, 14 ... connector body, 15 ... collar part, 16 ... large diameter part, 17 ... small diameter Part, 16a, 17a ... male screw part, 16b, 17b ... pipe insertion part, 18 ... internal passage, D ... connector for pipe connection.

Claims (1)

煤粒子を含むガスが流れる上流側の大径パイプとガス測定装置が取り付けられた下流側の小径パイプとを接続するためのガス測定用のパイプ接続用コネクタであって、軸方向の前後両側に大径部及び小径部が連設され、それら大径部及び小径部の内部に前記大径パイプ及び小径パイプの挿入部が形成されているとともに、外側にそれぞれ雄ねじ部を有するコネクタ本体と、前記大径パイプ及び小径パイプの外側に設けられて前記コネクタ本体の両雄ねじ部に螺着される袋ナットと、前記大径パイプ及び小径パイプの外側にそれぞれ設けられて前記袋ナットの螺着に伴い大径パイプ及び小径パイプに付勢されて大径パイプ及び小径パイプをコネクタ本体に固定するリング形状のフェルールとを備えてなり、前記コネクタ本体の大径パイプ挿入部と小径パイプ挿入部の間に位置する内部通路が下流側ほど先細まりとなる形状に形成されているとともに、前記前後両側のパイプ挿入部には、これら挿入部に挿入された大径パイプ及び小径パイプの内径が先細まり形状の内部通路の上流端及び下流端の内径とそれぞれ一致するような段差が設けられており、大径パイプと小径パイプとの接続状態において、大径パイプから小径パイプへと至るまでのガス通路に段差を生じないように構成したことを特徴とするガス測定用のパイプ接続用コネクタ。A pipe connector for gas measurement for connecting the downstream side of the small diameter pipe that is upstream of the large-diameter pipe and the gas measuring device is attached through which gas containing soot particles, before and after both sides in the axial direction The large diameter part and the small diameter part are continuously provided, the large diameter pipe and the insertion part of the small diameter pipe are formed inside the large diameter part and the small diameter part, and the connector main body having a male thread part on the outside, A cap nut provided outside the large-diameter pipe and the small-diameter pipe and screwed to both male screw portions of the connector body, and provided on the outside of the large-diameter pipe and the small-diameter pipe, respectively, along with the screwing of the cap nut It is biased in the large-diameter pipe and a small diameter pipe made and a ferrule ring-shaped fixing the large-diameter pipe and a small diameter pipe to the connector body, the large-diameter pipe insertion portion of said connector body With an internal passage located between the small-diameter pipe insertion portion is formed in a shape which is Mari tapered toward the downstream side, wherein the front and rear sides of the pipe insertion portion, the inserted large pipes and small diameter pipes to these insert portion Steps are provided so that the inner diameter of the tapered inner passage matches the inner diameter of the upstream end and the downstream end of the internal passage, and when the large diameter pipe and the small diameter pipe are connected, the large diameter pipe is changed to the small diameter pipe. A connector for pipe connection for gas measurement , characterized in that no step is formed in the gas passage to the end .
JP14229699A 1999-05-21 1999-05-21 Pipe connection connector for gas measurement Expired - Fee Related JP4253073B2 (en)

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JP4253073B2 true JP4253073B2 (en) 2009-04-08

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JP2008290020A (en) * 2007-05-25 2008-12-04 Anest Iwata Corp Coating material supply joint of spray gun
KR101473411B1 (en) 2013-06-13 2014-12-16 김무호 Connector
US11396963B2 (en) * 2018-01-29 2022-07-26 Brian B. Scott Device for making plumbing connections and a method of use thereof

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