JP4149702B2

JP4149702B2 - Compound measuring device

Info

Publication number: JP4149702B2
Application number: JP2001390754A
Authority: JP
Inventors: 豊吉田; 康弘澗隨
Original assignee: Takasago Thermal Engineering Co Ltd; Aichi Tokei Denki Co Ltd
Current assignee: Takasago Thermal Engineering Co Ltd; Aichi Tokei Denki Co Ltd
Priority date: 2001-12-25
Filing date: 2001-12-25
Publication date: 2008-09-17
Anticipated expiration: 2021-12-25
Also published as: JP2003194842A

Description

【０００１】
【発明の属する技術分野】
本発明は、流路に取り付けられて、流路内を流れる流体の流速、温度及び圧力を測定可能な計測装置に関する。
【０００２】
【従来の技術】
例えば、暖房設備では、建物の各部屋を貫通した流路に、流体としての温水を循環させて、各部屋を暖房する。そして、従来では、流路の途中に、流速計、温度計及び圧力計を設け、温水の流速、温度及び圧力を実測して、暖房設備の管理を行っていた。
【０００３】
【発明が解決しようとする課題】
しかしながら、従来では、流速計、温度計及び圧力計とが別体になっていたので、これら３種類の計測装置を取り付けるために、流路に沿って広い範囲で取り付けスペースが必要になると共に、取り付け作業に手間がかかっていた。また、これら３種類の計測装置の計測結果を、別々に見てチェックする必要があったので、チェック作業にも手間がかかっていた。
【０００４】
本発明は、上記事情に鑑みてなされたもので、流体の流速、温度及び圧力の計測結果を容易にチェックすることが可能であると共に、従来より小さいスペースで取り付け可能な複合計測装置の提供を目的とする。
【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なされた請求項１の発明に係る複合計測装置は、流路に取り付けられるセンサハウジングに、流路内を流れる流体の流速を計測するための流速計測部と、流体の圧力を計測するための圧力計測部と、流体の温度を計測するための温度計測部とを纏めて固定し、これら流速計測部、圧力計測部及び温度計測部から検出信号を取り込んで処理する信号処理部と、信号処理部による処理結果に基づき、流体の流速又はその流速に流路の断面積を掛けた流量と、圧力と温度とを、一画面に併せて表示する表示部とを備えた複合計測装置において、流速計測部は、センサハウジングに固定されて、流路に交差した磁界を生成するコイルと、センサハウジングのうち流体に露出した前端部に固定されて、磁界内を流れる流体に生じた起電力を検出するための１対の電極とで構成され、センサハウジングは、概ね柱状をなし、コイルは、センサハウジングのうち中心軸からずれた位置に偏在し、圧力計測部及び温度計測部は、センサハウジングの中心軸を挟んで、コイルと反対側に配置されたところに特徴を有する。
【０００６】
請求項２の発明に係る複合計測装置は、流路に取り付けられるセンサハウジングに、流路内を流れる流体の流速を計測するための流速計測部と、流体の圧力を計測するための圧力計測部と、流体の温度を計測するための温度計測部とを纏めて固定し、これら流速計測部、圧力計測部及び温度計測部から検出信号を取り込んで処理する信号処理部と、信号処理部による処理結果に基づき、流体の流速又はその流速に流路の断面積を掛けた流量と、圧力と温度とを、一画面に併せて表示する表示部とを備えた複合計測装置において、流速計測部は、センサハウジングに固定されて、流路に交差した磁界を生成するコイルと、センサハウジングのうち流体に露出した前端部に固定されて、磁界内を流れる流体に生じた起電力を検出するための１対の電極とで構成され、圧力計測部は、センサハウジングに形成されて、センサハウジングの前端部で開放した流体導入路と、流体導入路の奥部に配されて、流体の圧力を検出する圧力センサとで構成され、温度計測部は、センサハウジングの前端部に埋設したサーミスタで構成されたところに特徴を有する。
【０００７】
請求項３の発明は、請求項２記載の複合計測装置において、センサハウジングは、概ね柱状をなし、コイルは、センサハウジングのうち中心軸からずれた位置に偏在し、流体導入路及びサーミスタは、センサハウジングの中心軸を挟んで、コイルと反対側に配置されたところに特徴を有する。
【０００８】
請求項４の発明は、請求項２又は３に記載の複合計測装置において、センサハウジングは、概ね柱状をなし、圧力センサとコイルとを、センサハウジングの軸線方向に並べて配置したところに特徴を有する。
【０００９】
請求項５の発明は、請求項２乃至４の何れかに記載の複合計測装置において、１対の電極は、流体導入路より、流体の上流側に配されたところに特徴を有する。
【００１０】
【発明の作用及び効果】
＜請求項１の発明＞
請求項１の発明に係る複合計測装置によれば、流体の流速と圧力と温度とが、表示部の一画面に併せて表示されるので、流速又は流量と、温度及び圧力の計測結果を容易にチェックすることができる。また、従来の流速計、圧力計、温度計を別々に設けた場合に比べて、流路への取り付け作業が簡素化される。さらに、流速計測部、圧力計測部及び温度計測部をセンサハウジングに纏めて固定したから、これら各計測部の間でセンサハウジングが共有化され、省スペース化が図られる。しかも、概ね柱状のセンサハウジングのうち中心軸からずれた位置にコイルを偏在させたことで、センサハウジングの中心軸を挟んで、コイルと反対側に空きスペースができ、その空きスペースに圧力計測部と温度計測部とを配置したから、全体がコンパクトな構成になる。
【００１１】
＜請求項２の発明＞
請求項２の発明に係る複合計測装置によれば、流体の流速と圧力と温度とが、表示部の一画面に併せて表示されるので、流速又は流量と、温度及び圧力の計測結果を容易にチェックすることができる。また、従来の流速計、圧力計、温度計を別々に設けた場合に比べて、流路への取り付け作業が簡素化される。さらに、流速計測部、圧力計測部及び温度計測部をセンサハウジングに纏めて固定したから、これら各計測部の間でセンサハウジングが共有化され、省スペース化が図られる。しかも、流体導入路の奥部に圧力センサを配置したので、設計時における流体導入路の長さや向き等の変更により、圧力センサの配置の自由度が高まり、複合計測装置をコンパクトにすることが可能になる。また、温度計測部を構成するサーミスタは、センサハウジングの前端部に埋設されているので、流路の外面にサーミスタを取り付けた場合に比べて、温度計測のレスポンスが向上する。
【００１２】
＜請求項３の発明＞
請求項３の発明に係る複合計測装置によれば、概ね柱状のセンサハウジングのうち中心軸からずれた位置にコイルを偏在させたことで、センサハウジングの中心軸を挟んで、コイルと反対側に空きスペースができ、その空きスペースに流体導入路とサーミスタとを配置したから、全体がコンパクトな構成になる。
【００１３】
＜請求項４の発明＞
請求項４の発明に係る複合計測装置では、概ね柱状のセンサハウジングの軸方向に圧力センサとコイルとを並べたから、幅方向の小型化が図られる。
【００１４】
＜請求項５の発明＞
請求項５の発明に係る複合計測装置では、流速計測部の電極を、流体導入路より、流体の上流側に配したから、流体導入路により乱流が生じたとしても、その影響を抑えて、流速の計測を行うことができる。
【００１５】
【発明の実施の形態】
以下、本発明係る一実施形態を図１〜図８に基づいて説明する。
図１において、符合１０は、暖房設備に備えた流路であって、ボイラで加熱された温水がこの流路１０内に流される。流路１０の途中には、装置取付部１０Ａが設けられ、ここに本実施形態の複合計測装置２０が取り付けられる。
【００１６】
装置取付部１０Ａは、例えば、流路１０の一部から側方に向けてジョイント管１１を突出させ、そのジョイント管１１内に、筒状のアダプタ１２を螺合してなる。アダプタ１２の後端部（図１の左側端部）は、外形が六角形状をなしており、この六角部分を工具に嵌めて、アダプタ１２の先端部とジョイント管１１との螺合作業が行われる。また、アダプタ１２の外面のうち長手方向の中間部分には、ねじ部１３が切られている。なお、流路１０の一部とジョイント管１１とは、溶接又は接着剤にて固定されている。
【００１７】
さて、本実施形態の複合計測装置２０は、筐体状の本体部２１の背面から、円柱状のセンサヘッド２２を突出させた構造をなす。センサヘッド２２は、円筒状の金属シェル２３の内部に、合成樹脂製のセンサハウジング２４を挿入してなり、このセンサハウジング２４に、流速計測部６０と圧力計測部７０（図５参照）と温度計測部７５（図６参照）とが纏めて固定されている。
【００１８】
センサハウジング２４は、図２に概略形状が示されており、円柱体の長手方向の途中部分を、所謂、蒲鉾状に切除して平坦部２５を形成した構造をなし、この平坦部２５に蒲鉾状の蓋体２６が接合される。そして、図５に示すように、平坦部２５と蓋体２６との間に、流速計測部６０に備えたコイル６１が挟まれて保持される。より詳細には、流速計測部６０は、コイル６１と、そのコイル６１を巻回した丸棒状のコア６２と、１対の電極６３，６３とで構成されている。そして、平坦部２５と蓋体２６との互いの対向面には、コイル６１の外周面に対応した曲率の丸溝２７（図２参照）が形成されており、これら丸溝にコイル６１の一部が収められて、保持されている。
【００１９】
センサハウジング２４のうち平坦部２５の前端から直立した壁部には、１対の電極孔２８，２８が貫通形成されている。また、これら電極孔２８，２８の間には、平坦部２５側に開放しかつ奥側が閉塞したコア孔２９が形成されている。そして、図１に示すように、各電極６３が、各電極孔２８内に挿入されて、先端をセンサハウジング２４の先端面から若干突出させた状態にしてシール剤で固定され、さらに、抜け止め部材３４にて抜け止めされている。一方、コア孔２９内には、コア６２の前端部が突入されている。また、コア６２の後端部は、次述の磁路構成部材３１に形成した貫通孔３２に嵌合されている。
【００２０】
磁路構成部材３１は、例えば、図２に示すように、円弧状の扇部３１Ａから突片３１Ｂを延出した形状をなし、その扇部３１Ａに前記貫通孔３２が形成されている。これに対し、センサハウジング２４の前記平坦部２５には、図２に示すように、軸方向と直交する方向に角孔３３が貫通形成されている。そして、磁路構成部材３１の突片３１Ｂを、角孔３３に挿入した状態で、磁路構成部材３１を前方にスライドさせることで、コア６２の後端部が、磁路構成部材３１の貫通孔３２に挿入組み付けされる。また、扇部３１Ａの外周面と突片３１Ｂの先端面は、共に円弧状をなしており、これら円弧面が金属シェル２３に内接して、所謂、帰り磁路が構成され、これにより、コイル６１にて生成された磁束の多くが、センサハウジング２４の前方向（図１における右方向）に向けられる。
【００２１】
なお、前記したコイル６１、電極６３及び後述のサーミスタ７７から延びたリード線は、例えば、磁路構成部材３１及びセンサハウジング２４さらに後述の筒体３５の外面に形成した図示しない溝内に這わせて、本体部２１内に延ばされている。
【００２２】
図４には、複合計測装置２０が、装置取付部１０Ａに取り付けられた状態の正面図が示されている。同図に示すように、前記コイル６１は、センサハウジング２４のうち中心軸から偏心した位置に配置されている。より詳細には、コイル６１は、センサハウジング２４のうち中心軸より流路１０の上流側に配置され、前記電極６３，６３が、そのコイル６１の中心軸を間に挟んで、上下に並べて配されている。そして、センサハウジング２４のうち中心軸を挟んで、コイル６１と反対側、即ち、電極６３，６３より下流側には、圧力計測部７０と温度計測部７５とが上下に並べて設けられている。
【００２３】
圧力計測部７０は、図５に示すように、センサハウジング２４の軸方向に貫通した流体導入路７１と、流体導入路７１に連通してセンサハウジング２４の後端部に開放したセンサ収容空間７２と、このセンサ収容空間７２に収容された圧力センサ７３とで構成されている。より詳細には、圧力センサ７３を収容したセンサ収容空間７２は、センサハウジング２４の軸方向に沿ってコイル６１に並べて配置されると共に、そのコイル６１より流路１０から離れた側に位置している。そして、流体導入路７１にて、流路１０内の流体（温水）を、センサ収容空間７２（即ち、圧力センサ７３）まで案内している。このように、本実施形態では、流体導入路７１の奥部に圧力センサ７３を配置したから、設計時における流体導入路７１の長さや向き等の変更により、圧力センサ７３の配置の自由度が高まり、複合計測装置２０をコンパクトにすることができる。
【００２４】
圧力センサ７３は、図２に示すように、円柱状の本体７３Ａの端面に備えた偏平部７３Ｂに、ダイヤフラムを設けた構造をなす。そして、図５に示すように、偏平部７３Ｂの外周面に、Ｏリング８０Ａを配してセンサ収容空間７２内に押し込まれ、センサ収容空間７２の開放口側に螺合した筒体３５にて抜け止めされている。
【００２５】
なお、圧力センサ７３から延びたリード線は、筒体３５の内側に通されて本体部２１内に延びている。
【００２６】
温度計測部７５は、図６に示されており、センサハウジング２４の前端部に形成した凹所７６に、サーミスタ７７を埋設した構造になっている。
【００２７】
センサハウジング２４は、前述した流速計測部６０、圧力計測部７０及び温度計測部７５の各構成部品と、前記蓋体２６、筒体３５等を組み付けた状態で、金属シェル２３に挿入されて、例えば接着剤により、金属シェル２３内に抜け止めされている。また、センサハウジング２４の前端部分と金属シェル２３との間には、Ｏリング８０Ｂが配され、防水が図られている。そして、図１に示すように、前記したセンサヘッド２２は、金属シェル２３及びその内部に組み付けられた各計測部６０，７０，７５、センサハウジング２４等の種々の部品によって構成されている。
【００２８】
センサヘッド２２の後端部は、図１に示すように本体部２１の背面に備えた結合筒３６の奥部に、例えば接着剤にて固定されている。より詳細には、結合筒３６は、本体部２１側に小径部３６Ａを備え、センサヘッド２２の後端部が、その小径部３６Ａの端面に突き当てた状態にして固定されている。この結果、センサヘッド２２の後端部と結合筒３６との間には、前方に開放した隙間３６Ｂが形成され、この隙間３６Ｂに前記したアダプタ１２が挿入される。また、このとき、アダプタ１２内にセンサヘッド２２が嵌合される。そして、アダプタ１２のねじ部１３と、結合筒３６の先端内面とが螺合されて、複合計測装置２０が装置取付部１０Ａに固定される。また、センサヘッド２２とねじ部１３との間には、Ｏリング８０Ｃが配されている。
【００２９】
なお、アダプタ１２のねじ部１３と結合筒３６との螺合作業時には、複合計測装置２０全体を、結合筒３６の軸芯を中心に回転して行われる。ここで、前記結合筒３６の外面には、図示しない目印が付されており、その目印が、所定の方向を向きかつ流路１０の外面から所定距離に位置するようにして、前記螺合作業を行う。これにより、図３に示すように、センサハウジング２４の先端面が、流路１０内に位置し、図４に示すように、電極６３が流体導入路７１等より上流側に位置した状態に取り付けられる。また、アダプタ１２のねじ部１３と結合筒３６との螺合作業が完了したら、ねじ部１３の端部に予め螺合しておいた固定ナット８０Ｄを結合筒３６に押し付けて、緩み止めが図られる。
【００３０】
本体部２１は、図１に示すように、ケース８３内に回路基板を収容してなり、その回路基板上には、本発明に係る信号処理部８５（図７参照）の他、電源回路、コイル６１の駆動回路等が設けられている。信号処理部８５は、図７に示されており、ＭＰＵ８６を主要部として備え、前記した流速計測部６０、圧力計測部７０及び温度計測部７５による検出結果を、Ａ／Ｄコンバータ８９で変換してＭＰＵ８６に取り込んで処理する。そして、信号処理部８５の処理結果を、ケース８３の前面に備えた表示部８４に表示する。ここで、表示部８４には、流速と温度と圧力とが一画面に併せて表示される（図８参照）。また、ＭＰＵ８６に連なるメモリ８７には、所定の基準値が記憶されており、ＭＰＵ８６は、実測結果と前記所定の基準値とを比較して異常検出も行っている。そして、異常を検出したときには、本体部２１の前面に備えた警告灯８８（図８参照）を点滅させる。
【００３１】
本体部２１の底面には、ＭＰＵ８６の信号処理結果を出力するための外部出力端子（図示せず）が備えられており、この外部出力端子に接続したケーブル９０を、図示しない所定の装置に接続することができる。また、本体部２１内には、図１に示すように、複数の電池９１が内蔵されており、外部から電力を受けずに複合計測装置２０を作動させることができる。さらに、前記ケーブル９０の心線に電力線を設けておけば、電池を用いずにこの複合計測装置２０を作動させることもできる。
【００３２】
次に、上記構成からなる本実施形態の複合計測装置２０の動作について説明する。複合計測装置２０を起動すると、流路１０内を流れる温水の流速が、流速計測部６０によって検出される。具体的には、コイル６１が励磁されて、流路１０の横切る方向に磁界が生成される。そして、流路１０内を、導体である温水が流れて起電力が生じ、その起電力に基づいた電極６３，６３間の電圧が、流速計測部６０からの検出信号として信号処理部８５に取り込まれる。信号処理部８５では、流速計測部６０の検出信号を、Ａ／Ｄコンバータ８９を介してＭＰＵ８６に取り込み、温水の流速が求められる。
【００３３】
流路１０内の温水の圧力は、圧力計測部７０によって検出される。具体的には流路１０内の温水が流体導入路７１に入って、圧力センサ７３のダイヤフラムを押圧する。すると、この押圧されたダイヤフラムの変形量に基づく検出信号が、Ａ／Ｄコンバータ８９を介してＭＰＵ８６に取り込まれ、温水の圧力が求められる。また、流路１０内の温水の温度は、温度計測部７５を構成するサーミスタ７７によって計測される。即ち、サーミスタ７７の抵抗値の変化に基づく検出信号が、Ａ／Ｄコンバータ８９を介してＭＰＵ８６に取り込まれ、温水の温度が求められる。
【００３４】
そして、信号処理部８５における処理結果が表示部８４に出力され、図８に示すように、流体の流速と圧力と温度とが、表示部８４の一画面に併せて表示される。
【００３５】
このように、本実施形態の複合計測装置２０によれば、計測した流体の流速と圧力と温度とが、表示部８４の一画面に併せて表示されるので、流速、温度及び圧力の計測結果を容易にチェックすることができる。また、従来の流速計、圧力計、温度計を別々に設けた場合に比べて、流路１０への取り付け作業が簡素化される。さらに、流速計測部６０、圧力計測部７０及び温度計測部７５を纏めて固定したから、これら各計測部の間でセンサハウジング２４が共有化され、省スペース化が図られる。より詳細には、本実施形態の複合計測装置２０では、概ね円柱状のセンサハウジング２４のうち中心軸からずれた位置にコイル６１を偏在させたことで空きスペースを設けることができ、その空きスペースに流体導入路７１とサーミスタ７７とを配置したから、全体がコンパクトな構成になる。しかも、センサハウジング２４の軸方向に、圧力センサ７３とコイル６１とを並べたから、幅方向が小型化（スリム化）される。その上、流速計測部６０の電極６３，６３を、圧力計測部７０の流体導入路７１より上流側に配したから、流体導入路７１の下流側に乱流が生じたとしても、流速計測への影響を防ぐことができる。また、サーミスタ７７は、センサヘッド２２の前端部に埋設されているから、流路１０の外面にサーミスタを取り付けた場合に比べて、温度計測のレスポンスが向上する。
【００３６】
＜他の実施形態＞
本発明は、前記実施形態に限定されるものではなく、例えば、以下に説明するような実施形態も本発明の技術的範囲に含まれ、さらに、下記以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。
（１）前記実施形態の複合計測装置２０は、温水の流速を求めて表示部８４に表示する構成であったが、この流速に流路１０の断面積を掛けて温水の流量を求め、その流量を表示部８４に表示してもよい。
【００３７】
（２）前記実施形態では、信号処理部８５とセンサヘッド２２とを固定して備えていたが、信号処理部とセンサヘッドとを別々に設けて、両者の間をケーブル又は無線で接続した構成にしてもよい。
【００３８】
（３）前記実施形態では、複合計測装置が取り付けられる流路の一例として暖房設備に備えた流路を例示したが、本発明の複合計測装置は、暖房設備以外の設備に備えた流路に取り付けてもよい。
【図面の簡単な説明】
【図１】本発明の一実施形態に係る複合計測装置の側断面図
【図２】センサハウジングの斜視図
【図３】複合計測装置を流路に取り付けた状態の側断面図
【図４】複合計測装置の正面図
【図５】複合計測装置の圧力計測部を示した側断面図
【図６】複合計測装置の温度計測部を示した側断面図
【図７】信号処理回路のブロック図
【図８】複合計測装置の本体部の正面図
【符号の説明】
１０…流路
２０…複合計測装置
２４…センサハウジング
６０…流速計測部
６１…コイル
６３…電極
７０…圧力計測部
７１…流体導入路
７３…圧力センサ
７５…温度計測部
７７…サーミスタ
８５…信号処理部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a measuring device that is attached to a flow path and can measure the flow velocity, temperature, and pressure of a fluid flowing in the flow path.
[0002]
[Prior art]
For example, in a heating facility, each room is heated by circulating hot water as a fluid in a flow path that passes through each room of a building. Conventionally, a flowmeter, a thermometer, and a pressure gauge are provided in the middle of the flow path, and the flow rate, temperature, and pressure of hot water are measured to manage the heating equipment.
[0003]
[Problems to be solved by the invention]
However, in the past, since the flowmeter, thermometer, and pressure gauge were separated, in order to attach these three types of measuring devices, a large installation space was required along the flow path, It took time and effort to install. In addition, since it was necessary to check the measurement results of these three types of measuring devices separately, it was time consuming to perform the check work.
[0004]
The present invention has been made in view of the above circumstances, and it is possible to easily check the measurement results of fluid flow velocity, temperature, and pressure, and to provide a composite measurement device that can be attached in a smaller space than conventional ones. Objective.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a composite measuring apparatus according to the invention of claim 1 includes a sensor housing attached to the flow path, a flow rate measuring unit for measuring the flow speed of the fluid flowing in the flow path, A signal for processing the pressure measurement unit for measuring the pressure and the temperature measurement unit for measuring the temperature of the fluid by collecting the detection signals from the flow velocity measurement unit, the pressure measurement unit and the temperature measurement unit. Based on the processing result of the processing unit and the signal processing unit, the flow rate of the fluid or the flow rate obtained by multiplying the flow rate by the cross-sectional area of the flow path, and the display unit that displays the pressure and temperature in one screen are provided . In the composite measuring device, the flow velocity measuring unit is fixed to the sensor housing and generates a magnetic field that intersects the flow path, and is fixed to the front end of the sensor housing that is exposed to the fluid. Living The sensor housing has a substantially columnar shape, and the coil is unevenly distributed at a position deviated from the central axis of the sensor housing, and includes a pressure measuring unit and a temperature measuring unit. Is characterized in that it is disposed on the opposite side of the coil across the central axis of the sensor housing .
[0006]
According to a second aspect of the present invention, there is provided a composite measurement apparatus comprising: a sensor housing attached to a flow path; a flow rate measurement unit for measuring a flow rate of fluid flowing in the flow path; and a pressure measurement unit for measuring fluid pressure And a temperature processing unit for measuring the temperature of the fluid collectively, and a signal processing unit that captures and processes detection signals from the flow velocity measurement unit, the pressure measurement unit, and the temperature measurement unit, and processing by the signal processing unit On the basis of the result, in the composite measuring device having the flow rate of the fluid or the flow rate obtained by multiplying the flow rate by the cross-sectional area of the flow path, and the display unit that displays the pressure and temperature in one screen, the flow rate measurement unit is A coil that is fixed to the sensor housing and generates a magnetic field that intersects the flow path; and a sensor housing that is fixed to a front end portion exposed to the fluid to detect an electromotive force generated in the fluid flowing in the magnetic field. A pair of The pressure measuring part is formed in the sensor housing, and is formed in the sensor housing, and is disposed in the fluid introduction path opened at the front end part of the sensor housing, and is disposed in the back part of the fluid introduction path, and detects the pressure of the fluid The temperature measuring unit is characterized by a thermistor embedded in the front end of the sensor housing.
[0007]
According to a third aspect of the present invention, in the composite measuring apparatus according to the second aspect, the sensor housing is substantially columnar, the coil is unevenly distributed at a position shifted from the central axis of the sensor housing, and the fluid introduction path and the thermistor are The sensor housing is characterized in that it is disposed on the opposite side of the coil across the central axis of the sensor housing.
[0008]
According to a fourth aspect of the present invention, in the composite measuring apparatus according to the second or third aspect, the sensor housing has a substantially columnar shape, and the pressure sensor and the coil are arranged side by side in the axial direction of the sensor housing. .
[0009]
The invention of claim 5 is characterized in that, in the composite measuring device according to any one of claims 2 to 4, the pair of electrodes are arranged on the upstream side of the fluid from the fluid introduction path.
[0010]
[Action and effect of the invention]
<Invention of Claim 1>
According to the composite measuring apparatus according to the invention of claim 1, the flow velocity of the fluid and the pressure and temperature, because it is displayed together on one screen of the display unit, and the flow rate or flow rate, temperature and pressure measurement result easily Can be checked. Moreover, the attachment work to a flow path is simplified compared with the case where the conventional current meter, pressure gauge, and thermometer are provided separately. Furthermore, since the flow velocity measurement unit, the pressure measurement unit, and the temperature measurement unit are collectively fixed to the sensor housing, the sensor housing is shared among these measurement units, thereby saving space. In addition, the coil is unevenly distributed at a position shifted from the central axis in the substantially columnar sensor housing, so that an empty space is created on the opposite side of the coil across the central axis of the sensor housing. Since the temperature measuring unit and the temperature measuring unit are arranged, the entire configuration is compact.
[0011]
<Invention of Claim 2>
According to the composite measurement device of the second aspect of the present invention, the flow velocity, pressure and temperature of the fluid are displayed together on one screen of the display unit, so that the measurement result of the flow velocity or flow rate and the temperature and pressure can be easily obtained. Can be checked. Moreover, the attachment work to a flow path is simplified compared with the case where the conventional current meter, pressure gauge, and thermometer are provided separately. Furthermore, since the flow velocity measurement unit, the pressure measurement unit, and the temperature measurement unit are collectively fixed to the sensor housing, the sensor housing is shared among these measurement units, thereby saving space. In addition , since the pressure sensor is arranged at the back of the fluid introduction path, a change in the length and orientation of the fluid introduction path at the time of design increases the degree of freedom in the arrangement of the pressure sensor, making the composite measuring device compact. It becomes possible. Moreover, since the thermistor which comprises a temperature measurement part is embed | buried under the front-end part of a sensor housing, the response of temperature measurement improves compared with the case where a thermistor is attached to the outer surface of a flow path.
[0012]
<Invention of Claim 3>
According to the composite measuring apparatus of the third aspect of the invention, the coil is unevenly distributed at a position shifted from the central axis in the substantially columnar sensor housing, so that the central axis of the sensor housing is sandwiched between the opposite side of the coil. Since an empty space is created and the fluid introduction path and the thermistor are arranged in the empty space, the entire structure is compact.
[0013]
<Invention of Claim 4>
In the composite measuring apparatus according to the fourth aspect of the present invention, the pressure sensor and the coil are arranged in the axial direction of the substantially columnar sensor housing, so that the size in the width direction can be reduced.
[0014]
<Invention of Claim 5>
In the composite measuring device according to the fifth aspect of the present invention, since the electrode of the flow velocity measuring unit is arranged on the upstream side of the fluid from the fluid introduction path, even if turbulence occurs in the fluid introduction path, the influence is suppressed. The flow rate can be measured.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to FIGS.
In FIG. 1, reference numeral 10 is a flow path provided in the heating facility, and hot water heated by the boiler is caused to flow into the flow path 10. An apparatus mounting portion 10A is provided in the middle of the flow path 10, and the composite measuring apparatus 20 of the present embodiment is attached thereto.
[0016]
The device attachment portion 10A is formed by, for example, projecting the joint pipe 11 from a part of the flow path 10 to the side, and screwing a cylindrical adapter 12 into the joint pipe 11. The rear end portion of the adapter 12 (the left end portion in FIG. 1) has a hexagonal outer shape, and the hexagonal portion is fitted into a tool so that the tip end portion of the adapter 12 and the joint tube 11 are screwed together. Is called. Further, a threaded portion 13 is cut in an intermediate portion in the longitudinal direction of the outer surface of the adapter 12. A part of the flow path 10 and the joint pipe 11 are fixed by welding or an adhesive.
[0017]
Now, the composite measuring device 20 of the present embodiment has a structure in which a columnar sensor head 22 is projected from the rear surface of a housing-like main body 21. The sensor head 22 is formed by inserting a sensor housing 24 made of a synthetic resin into a cylindrical metal shell 23. The sensor housing 24 includes a flow velocity measuring unit 60, a pressure measuring unit 70 (see FIG. 5), and a temperature. The measuring unit 75 (see FIG. 6) is fixed together.
[0018]
A schematic shape of the sensor housing 24 is shown in FIG. 2, and a flat portion 25 is formed by cutting out a middle portion of the cylindrical body in a so-called bowl shape. The lid 26 is joined. Then, as shown in FIG. 5, the coil 61 provided in the flow velocity measuring unit 60 is sandwiched and held between the flat portion 25 and the lid body 26. More specifically, the flow velocity measuring unit 60 includes a coil 61, a round bar-shaped core 62 around which the coil 61 is wound, and a pair of electrodes 63 and 63. Further, round grooves 27 (see FIG. 2) having a curvature corresponding to the outer peripheral surface of the coil 61 are formed on the opposing surfaces of the flat portion 25 and the lid body 26, and one of the coils 61 is formed in these round grooves. The part is stored and held.
[0019]
A pair of electrode holes 28 are formed in the sensor housing 24 so as to penetrate the wall portion standing upright from the front end of the flat portion 25. Further, a core hole 29 that is open to the flat portion 25 side and closed on the back side is formed between the electrode holes 28 and 28. As shown in FIG. 1, each electrode 63 is inserted into each electrode hole 28 and fixed with a sealant with the tip slightly protruding from the tip surface of the sensor housing 24, and is further prevented from coming off. The member 34 is prevented from coming off. On the other hand, the front end portion of the core 62 protrudes into the core hole 29. The rear end portion of the core 62 is fitted into a through hole 32 formed in the magnetic path constituting member 31 described below.
[0020]
For example, as shown in FIG. 2, the magnetic path constituting member 31 has a shape in which a protruding piece 31B is extended from an arc-shaped fan portion 31A, and the through hole 32 is formed in the fan portion 31A. On the other hand, as shown in FIG. 2, a square hole 33 is formed in the flat portion 25 of the sensor housing 24 in a direction perpendicular to the axial direction. Then, the rear end portion of the core 62 penetrates the magnetic path constituent member 31 by sliding the magnetic path constituent member 31 forward in a state where the protruding piece 31B of the magnetic path constituent member 31 is inserted into the square hole 33. The hole 32 is inserted and assembled. Further, the outer peripheral surface of the fan portion 31A and the tip end surface of the projecting piece 31B are both arc-shaped, and these arc surfaces are inscribed in the metal shell 23 to form a so-called return magnetic path. Most of the magnetic flux generated at 61 is directed in the front direction of the sensor housing 24 (right direction in FIG. 1).
[0021]
Note that the lead wires extending from the coil 61, the electrode 63, and the thermistor 77 described later are placed in a groove (not shown) formed on the outer surface of the magnetic path constituting member 31, the sensor housing 24, and the cylinder 35 described later, for example. The main body 21 is extended.
[0022]
FIG. 4 shows a front view of the state where the composite measuring device 20 is attached to the device attaching portion 10A. As shown in the figure, the coil 61 is arranged at a position eccentric from the central axis in the sensor housing 24. More specifically, the coil 61 is disposed on the upstream side of the flow path 10 from the central axis of the sensor housing 24, and the electrodes 63 and 63 are arranged side by side with the central axis of the coil 61 in between. Has been. A pressure measuring unit 70 and a temperature measuring unit 75 are arranged vertically on the opposite side of the coil 61, that is, on the downstream side of the electrodes 63 and 63 with the central axis in the sensor housing 24.
[0023]
As shown in FIG. 5, the pressure measuring unit 70 includes a fluid introduction path 71 that penetrates the sensor housing 24 in the axial direction, and a sensor accommodation space 72 that communicates with the fluid introduction path 71 and opens to the rear end of the sensor housing 24. And a pressure sensor 73 housed in the sensor housing space 72. More specifically, the sensor housing space 72 that houses the pressure sensor 73 is arranged side by side in the coil 61 along the axial direction of the sensor housing 24, and is located on the side farther from the flow path 10 than the coil 61. Yes. Then, the fluid (warm water) in the flow path 10 is guided to the sensor housing space 72 (that is, the pressure sensor 73) through the fluid introduction path 71. As described above, in the present embodiment, the pressure sensor 73 is disposed in the inner part of the fluid introduction path 71. Therefore, the degree of freedom of the arrangement of the pressure sensor 73 is increased by changing the length, the direction, and the like of the fluid introduction path 71 at the time of design. As a result, the composite measuring device 20 can be made compact.
[0024]
As shown in FIG. 2, the pressure sensor 73 has a structure in which a diaphragm is provided on a flat portion 73B provided on an end surface of a cylindrical main body 73A. Then, as shown in FIG. 5, an O-ring 80 </ b> A is arranged on the outer peripheral surface of the flat portion 73 </ b> B and is pushed into the sensor housing space 72, and is screwed into the opening side of the sensor housing space 72. It has been retained.
[0025]
The lead wire extending from the pressure sensor 73 is passed through the inside of the cylindrical body 35 and extends into the main body 21.
[0026]
The temperature measurement unit 75 is shown in FIG. 6 and has a structure in which a thermistor 77 is embedded in a recess 76 formed at the front end of the sensor housing 24.
[0027]
The sensor housing 24 is inserted into the metal shell 23 in a state where the component parts of the flow velocity measuring unit 60, the pressure measuring unit 70, and the temperature measuring unit 75, the lid body 26, the cylindrical body 35, and the like are assembled. For example, it is prevented from coming off in the metal shell 23 by an adhesive. Further, an O-ring 80B is disposed between the front end portion of the sensor housing 24 and the metal shell 23 so as to be waterproof. As shown in FIG. 1, the sensor head 22 is composed of various components such as the metal shell 23 and the measuring units 60, 70, 75 and the sensor housing 24 assembled therein.
[0028]
As shown in FIG. 1, the rear end of the sensor head 22 is fixed to, for example, an adhesive at the back of the coupling cylinder 36 provided on the back surface of the main body 21. More specifically, the coupling cylinder 36 includes a small diameter portion 36A on the main body portion 21 side, and is fixed in a state where the rear end portion of the sensor head 22 abuts against the end surface of the small diameter portion 36A. As a result, a gap 36B opened forward is formed between the rear end portion of the sensor head 22 and the coupling cylinder 36, and the adapter 12 is inserted into the gap 36B. At this time, the sensor head 22 is fitted into the adapter 12. Then, the screw portion 13 of the adapter 12 and the inner surface of the distal end of the coupling tube 36 are screwed together, and the composite measuring device 20 is fixed to the device mounting portion 10A. An O-ring 80 </ b> C is disposed between the sensor head 22 and the screw portion 13.
[0029]
It should be noted that when the screw portion 13 of the adapter 12 and the coupling cylinder 36 are screwed together, the entire composite measuring device 20 is rotated around the axis of the coupling cylinder 36. Here, a mark (not shown) is attached to the outer surface of the coupling cylinder 36, and the screwing operation is performed so that the mark faces a predetermined direction and is positioned at a predetermined distance from the outer surface of the flow path 10. I do. Thus, as shown in FIG. 3, the tip surface of the sensor housing 24 is positioned in the flow path 10, and as shown in FIG. 4, the electrode 63 is attached in a state of being positioned upstream of the fluid introduction path 71 and the like. It is done. Further, when the screwing operation between the screw portion 13 of the adapter 12 and the coupling cylinder 36 is completed, a fixing nut 80D that has been screwed in advance with the end of the screw section 13 is pressed against the coupling cylinder 36 to prevent loosening. It is done.
[0030]
As shown in FIG. 1, the main body portion 21 accommodates a circuit board in a case 83. On the circuit board, in addition to the signal processing section 85 (see FIG. 7) according to the present invention, a power circuit, A drive circuit for the coil 61 is provided. The signal processing unit 85 is shown in FIG. 7 and includes an MPU 86 as a main part, and the A / D converter 89 converts the detection results obtained by the flow velocity measuring unit 60, the pressure measuring unit 70, and the temperature measuring unit 75. To MPU 86 for processing. Then, the processing result of the signal processing unit 85 is displayed on the display unit 84 provided on the front surface of the case 83. Here, the flow rate, temperature, and pressure are displayed together on one screen on the display unit 84 (see FIG. 8). In addition, a predetermined reference value is stored in the memory 87 connected to the MPU 86, and the MPU 86 also performs abnormality detection by comparing the actual measurement result with the predetermined reference value. And when abnormality is detected, the warning lamp 88 (refer FIG. 8) with which the front surface of the main-body part 21 was equipped is blinked.
[0031]
The bottom surface of the main body 21 is provided with an external output terminal (not shown) for outputting the signal processing result of the MPU 86, and the cable 90 connected to the external output terminal is connected to a predetermined device (not shown). can do. Further, as shown in FIG. 1, a plurality of batteries 91 are built in the main body portion 21, and the composite measuring device 20 can be operated without receiving power from the outside. Furthermore, if a power line is provided in the core of the cable 90, the composite measuring apparatus 20 can be operated without using a battery.
[0032]
Next, the operation of the composite measuring apparatus 20 of the present embodiment having the above configuration will be described. When the composite measuring device 20 is activated, the flow velocity measurement unit 60 detects the flow velocity of the hot water flowing in the flow path 10. Specifically, the coil 61 is excited and a magnetic field is generated in a direction across the flow path 10. Then, hot water as a conductor flows in the flow path 10 to generate an electromotive force, and a voltage between the electrodes 63 and 63 based on the electromotive force is taken into the signal processing unit 85 as a detection signal from the flow velocity measuring unit 60. It is. In the signal processing unit 85, the detection signal of the flow rate measuring unit 60 is taken into the MPU 86 via the A / D converter 89, and the flow rate of the hot water is obtained.
[0033]
The pressure of the hot water in the flow path 10 is detected by the pressure measuring unit 70. Specifically, the hot water in the flow path 10 enters the fluid introduction path 71 and presses the diaphragm of the pressure sensor 73. Then, a detection signal based on the deformation amount of the pressed diaphragm is taken into the MPU 86 via the A / D converter 89, and the pressure of the hot water is obtained. Further, the temperature of the hot water in the flow path 10 is measured by the thermistor 77 that constitutes the temperature measuring unit 75. That is, a detection signal based on a change in the resistance value of the thermistor 77 is taken into the MPU 86 via the A / D converter 89, and the temperature of the hot water is obtained.
[0034]
Then, the processing result in the signal processing unit 85 is output to the display unit 84, and the fluid flow velocity, pressure, and temperature are displayed together on one screen of the display unit 84 as shown in FIG.
[0035]
Thus, according to the composite measuring apparatus 20 of the present embodiment, the measured flow velocity, pressure, and temperature of the fluid are displayed together on one screen of the display unit 84, so that the measurement results of the flow velocity, temperature, and pressure are displayed. Can be easily checked. Moreover, the attachment work to the flow path 10 is simplified compared with the case where the conventional current meter, pressure gauge, and thermometer are provided separately. Furthermore, since the flow velocity measurement unit 60, the pressure measurement unit 70, and the temperature measurement unit 75 are fixed together, the sensor housing 24 is shared among these measurement units, and space saving is achieved. More specifically, in the composite measuring apparatus 20 of the present embodiment, an empty space can be provided by unevenly distributing the coil 61 at a position shifted from the central axis in the substantially cylindrical sensor housing 24. Since the fluid introduction path 71 and the thermistor 77 are disposed in the whole, the entire structure is compact. Moreover, since the pressure sensor 73 and the coil 61 are arranged in the axial direction of the sensor housing 24, the width direction is downsized (slimmed). In addition, since the electrodes 63 and 63 of the flow velocity measuring unit 60 are arranged on the upstream side of the fluid introduction path 71 of the pressure measurement unit 70, even if turbulent flow occurs on the downstream side of the fluid introduction path 71, the flow velocity measurement is performed. Can prevent the influence. Further, since the thermistor 77 is embedded in the front end portion of the sensor head 22, the temperature measurement response is improved as compared with the case where the thermistor is attached to the outer surface of the flow path 10.
[0036]
<Other embodiments>
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following are within the scope not departing from the gist. It can be changed and implemented.
(1) The composite measuring device 20 of the above embodiment has a configuration in which the flow rate of the hot water is obtained and displayed on the display unit 84. The flow rate of the hot water is obtained by multiplying the flow rate by the cross-sectional area of the flow path 10, and The flow rate may be displayed on the display unit 84.
[0037]
(2) In the above embodiment, the signal processing unit 85 and the sensor head 22 are fixedly provided. However, the signal processing unit and the sensor head are provided separately, and the two are connected by cable or wirelessly. It may be.
[0038]
(3) In the said embodiment, although the flow path provided in the heating equipment was illustrated as an example of the flow path in which the composite measurement device is attached, the composite measurement device of the present invention is provided in the flow passage provided in the equipment other than the heating equipment. It may be attached.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a composite measuring apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view of a sensor housing. FIG. 3 is a side sectional view of the composite measuring apparatus attached to a flow path. FIG. 5 is a sectional side view showing a pressure measuring unit of the compound measuring device. FIG. 6 is a side sectional view showing a temperature measuring unit of the compound measuring device. FIG. 7 is a block diagram of a signal processing circuit. FIG. 8 is a front view of the main body of the composite measuring apparatus.
DESCRIPTION OF SYMBOLS 10 ... Channel 20 ... Compound measuring device 24 ... Sensor housing 60 ... Flow velocity measuring part 61 ... Coil 63 ... Electrode 70 ... Pressure measuring part 71 ... Fluid introduction path 73 ... Pressure sensor 75 ... Temperature measuring part 77 ... Thermistor 85 ... Signal processing Part

Claims

A sensor housing attached to the flow path, a flow rate measurement unit for measuring a flow rate of the fluid flowing in the flow path, a pressure measurement unit for measuring the pressure of the fluid, and a temperature of the fluid And fix the temperature measuring unit together
A signal processing unit that takes in and processes detection signals from these flow velocity measurement unit, pressure measurement unit, and temperature measurement unit;
Based on the processing result by the signal processing unit, a composite including a flow rate of the fluid or a flow rate obtained by multiplying the flow rate by the cross-sectional area of the flow path, and a display unit that displays pressure and temperature in one screen. In the measuring device,
The flow velocity measurement unit is fixed to the sensor housing and generates a magnetic field intersecting the flow path, and a fluid that is fixed to a front end of the sensor housing exposed to the fluid and flows in the magnetic field. And a pair of electrodes for detecting the electromotive force generated in the
The sensor housing is generally columnar,
The coil is unevenly distributed at a position shifted from the central axis of the sensor housing, and the pressure measuring unit and the temperature measuring unit are disposed on the opposite side of the coil with the central axis of the sensor housing interposed therebetween. A combined measuring device.

A sensor housing attached to the flow path, a flow rate measurement unit for measuring a flow rate of the fluid flowing in the flow path, a pressure measurement unit for measuring the pressure of the fluid, and a temperature of the fluid And fix the temperature measuring unit together
A signal processing unit that takes in and processes detection signals from these flow velocity measurement unit, pressure measurement unit, and temperature measurement unit;
Based on the processing result by the signal processing unit, a composite including a flow rate of the fluid or a flow rate obtained by multiplying the flow rate by the cross-sectional area of the flow path, and a display unit that displays pressure and temperature in one screen. In the measuring device,
The flow velocity measurement unit is fixed to the sensor housing and generates a magnetic field intersecting the flow path, and a fluid that is fixed to a front end of the sensor housing exposed to the fluid and flows in the magnetic field. And a pair of electrodes for detecting the electromotive force generated in the
The pressure measuring unit is formed in the sensor housing and is opened at a front end portion of the sensor housing, and a pressure sensor is provided in a back part of the fluid introduction path to detect the pressure of the fluid. Consists of
The temperature measuring unit is double if the measuring device you characterized in that it is constituted by a thermistor that is embedded in the front end portion of the sensor housing.

The sensor housing has a substantially columnar shape, the coil is unevenly distributed at a position shifted from a central axis of the sensor housing, and the fluid introduction path and the thermistor sandwich the central axis of the sensor housing, and the coil The composite measuring apparatus according to claim 2, wherein the composite measuring apparatus is disposed on a side opposite to the first side.

4. The composite measurement apparatus according to claim 2, wherein the sensor housing is substantially columnar, and the pressure sensor and the coil are arranged side by side in an axial direction of the sensor housing.

5. The composite measuring apparatus according to claim 2, wherein the pair of electrodes are arranged upstream of the fluid from the fluid introduction path.