JP2020134160A - Flow meter inspection device and inspection method of flow meter - Google Patents
Flow meter inspection device and inspection method of flow meter Download PDFInfo
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Abstract
Description
本発明は、ソニックノズルで一部が構成される検査用配管の途中に流量計が接続され、検査用配管の上流側端部から気体が吸引されて、流量計の計測精度の検査が行われる流量計検査装置及びそのような流量計検査装置を使用する流量計の検査方法に関する。 In the present invention, a flow meter is connected in the middle of an inspection pipe partially composed of a sonic nozzle, gas is sucked from the upstream end of the inspection pipe, and the measurement accuracy of the flow meter is inspected. The present invention relates to a flow meter inspection device and an inspection method of a flow meter using such a flow meter inspection device.
この種の流量計の検査方法は、一般的には、気温が一定になるように制御されている検査室内で行われ、その検査室内の大気を検査用配管に流す（例えば、特許文献１参照）。 The inspection method of this type of flow meter is generally performed in an inspection room where the temperature is controlled to be constant, and the air in the inspection room is passed through the inspection pipe (see, for example, Patent Document 1). ).
しかしながら、外乱によって検査室内の気温が変化することがあり、検査用配管を流れる大気の温度変化により検査精度が悪くなるという問題があった。このため、気体の気温変化による影響を受け難い流量計検査装置及び検査方法の開発が求められている。 However, there is a problem that the temperature in the inspection room may change due to the disturbance, and the inspection accuracy deteriorates due to the temperature change of the atmosphere flowing through the inspection pipe. Therefore, there is a need to develop a flow meter inspection device and an inspection method that are not easily affected by changes in the temperature of the gas.
上記課題を解決するためになされた請求項１の発明は、ソニックノズルで一部が構成される検査用配管のうち前記ソニックノズルより上流側の途中に検査対象の流量計が接続される流量計接続部を有し、前記検査用配管の上流側端部から気体が吸引されて、前記流量計の計測精度の検査が行われる流量計検査装置において、前記検査用配管のうち前記流量計接続部より上流側に充填又は嵌合されると共に内部を前記気体が通過し、その通過する前記気体の温度変化を緩和する温度変化用ダンパーを有する流量計検査装置である。 The invention of claim 1 made to solve the above problem is a flow meter in which a flow meter to be inspected is connected in the middle of an inspection pipe partially composed of a sonic nozzle on the upstream side of the sonic nozzle. In a flow meter inspection device having a connection portion and gas is sucked from the upstream end of the inspection pipe to inspect the measurement accuracy of the flow meter, the flow meter connection portion of the inspection pipe is used. It is a flow meter inspection device having a temperature change damper that is filled or fitted to the upstream side and the gas passes through the inside to mitigate the temperature change of the passing gas.
請求項２の発明は、前記温度変化用ダンパーは、金属線材、金属粒体、金属粒体を焼結してなる焼結体、又は、金属を発泡成形してなる金属発泡体である請求項１に記載の流量計検査装置である。 According to the second aspect of the present invention, the temperature change damper is a metal wire rod, metal granules, a sintered body obtained by sintering metal granules, or a metal foam obtained by foam-molding metal. The flow meter inspection device according to 1.
請求項３の発明は、前記温度変化用ダンパーにより、前記気体の温度変化量が７５％以下に緩和される請求項１又は２に記載の流量計検査装置である。 The invention according to claim 3 is the flow meter inspection device according to claim 1 or 2, wherein the amount of temperature change of the gas is alleviated to 75% or less by the temperature change damper.
請求項４の発明は、前記検査用配管のうち前記温度変化用ダンパーを有する部分の内径が、それ以外の部分に比べて大きい請求項１乃至３の何れか１の請求項に記載の流量計検査装置である。 The flow meter according to any one of claims 1 to 3, wherein the invention of claim 4 has an inner diameter of a portion of the inspection pipe having a temperature change damper larger than that of the other portions. It is an inspection device.
請求項５の発明は、前記温度変化用ダンパーと前記流量計接続部との間に、前記温度変化用ダンパーの破片を除去するフィルタが備えられている請求項１乃至４の何れか１の請求項に記載の流量計検査装置である。 The invention of claim 5 is any one of claims 1 to 4, wherein a filter for removing fragments of the temperature change damper is provided between the temperature change damper and the flow meter connection portion. The flow meter inspection device according to the item.
請求項６の発明は、請求項１乃至５の何れか１の請求項に記載の流量計検査装置を使用して、前記流量計にて前記気体の流量を実測し、その流量計の計測精度の検査を行う流量計の検査方法である。 The invention of claim 6 uses the flow meter inspection device according to any one of claims 1 to 5 to measure the flow rate of the gas with the flow meter, and the measurement accuracy of the flow meter. It is an inspection method of a flow meter that inspects.
請求項１及び請求項６の流量計検査装置及び流量計の検査方法によれば、検査用配管に吸引される気体の温度が変化しても、検査用配管に備えた温度変化用ダンパーを通過するときにその温度変化用ダンパーとの間で熱交換が行われて気体の温度変化が緩和される。また、空調設備による気体の温度変動の変動幅も温度変化用ダンパーによって緩和される。そして、温度変化用ダンパーを通過して温度変化が緩和された気体を、流量計、ソニックノズルへと流して流量計の検査を行うことができる。このように請求項１及び６の流量計検査装置及び流量計の検査方法によれば、流量計の検査を行う際の気体の温度変化による影響を受け難くなる。 According to the flow meter inspection device and the inspection method of the flow meter according to claims 1 and 6, even if the temperature of the gas sucked into the inspection pipe changes, the gas passes through the temperature change damper provided in the inspection pipe. At that time, heat exchange is performed with the temperature change damper to alleviate the temperature change of the gas. In addition, the fluctuation range of the temperature fluctuation of the gas due to the air conditioning equipment is also mitigated by the temperature change damper. Then, the gas that has passed through the temperature change damper and whose temperature change has been relaxed can be flowed to the flow meter and the sonic nozzle to inspect the flow meter. As described above, according to the flow meter inspection device and the inspection method of the flow meter according to claims 1 and 6, it is less likely to be affected by the temperature change of the gas when inspecting the flow meter.
請求項２の流量計検査装置のように、温度変化用ダンパーが、金属線材、金属粒体、金属粒体を焼結してなる焼結体、又は、金属を発泡成形してなる金属発泡体であれば、温度変化用ダンパーにおける気体との接触面積を広く確保することができ、その分、温度変化用ダンパーをコンパクトにすることができる。 Like the flow meter inspection device of claim 2, the temperature change damper is a sintered body obtained by sintering a metal wire rod, a metal particle body, or a metal particle body, or a metal foam formed by foam-molding a metal. If this is the case, a wide contact area with the gas in the temperature change damper can be secured, and the temperature change damper can be made compact accordingly.
請求項３の流量計検査装置のように、温度変化用ダンパーによる気体の温度変化量が７５％以下に緩和されることが好ましい。 As in the flow meter inspection device of claim 3, it is preferable that the amount of temperature change of the gas due to the temperature change damper is reduced to 75% or less.
請求項４の流量計検査装置では、検査用配管のうち温度変化用ダンパーを有する部分の内径が、それ以外の部分に比べて大きいので、温度変化用ダンパーにおける気体との接触面積を広く確保することができ、気体の温度変化の緩和機能、即ち、ダンパー機能を高くすることができる。 In the flow meter inspection device of claim 4, since the inner diameter of the portion of the inspection pipe having the temperature change damper is larger than that of the other portions, a wide contact area with gas in the temperature change damper is secured. It is possible to enhance the function of mitigating the temperature change of the gas, that is, the damper function.
請求項５の流量計検査装置によれば、仮に温度変化用ダンパーの一部が破片となって分離してもそれをフィルタにて捕捉し、流量計、ソニックノズルへと流れることを防ぐことができる。 According to the flow meter inspection device of claim 5, even if a part of the temperature change damper becomes a fragment and separates, it can be captured by a filter and prevented from flowing to the flow meter and the sonic nozzle. it can.
以下、図１〜図３を参照して流量計検査装置１０の実施形態について説明する。図１に示すように、本実施形態の流量計検査装置１０は、ソニックノズル５０で一部が構成される検査用配管３０と、その一端部に接続される吸引ポンプ５１とを有する。そして、ソニックノズルを使った一般的な流量計検査装置と同様に、本実施形態の流量計検査装置１０も吸引ポンプ５１が作動すると、ソニックノズル５０の上流側圧力と下流側圧力との圧力比が臨界圧力比以下に保たれ、ソニックノズル５０のスロート部を通過する気体の流速が音速に固定されるようになっている。これにより、検査用配管３０に吸引される気体の温度が一定であれば、一定流量（以下、これを「基準流量」という）の気体が検査用配管３０を流れる。また、基準流量を変更するために、スロート部の流路断面積が異なる複数のソニックノズル５０が用意されていて、それらから任意のソニックノズル５０を選択して検査用配管３０の一部として組み付けることができるようになっている。 Hereinafter, embodiments of the flowmeter inspection device 10 will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the flow meter inspection device 10 of the present embodiment has an inspection pipe 30 partially composed of a sonic nozzle 50 and a suction pump 51 connected to one end thereof. Then, similarly to the general flow meter inspection device using the sonic nozzle, the flow meter inspection device 10 of the present embodiment also has a pressure ratio of the upstream pressure to the downstream pressure of the sonic nozzle 50 when the suction pump 51 operates. Is kept below the critical pressure ratio, and the flow velocity of the gas passing through the throat portion of the sonic nozzle 50 is fixed to the speed of sound. As a result, if the temperature of the gas sucked into the inspection pipe 30 is constant, a gas having a constant flow rate (hereinafter, this is referred to as a “reference flow rate”) flows through the inspection pipe 30. Further, in order to change the reference flow rate, a plurality of sonic nozzles 50 having different flow path cross sections of the throat portion are prepared, and any sonic nozzle 50 is selected from them and assembled as a part of the inspection pipe 30. You can do it.
検査用配管３０のうちソニックノズル５０より上流側には、１つ又は複数の流量計２０をソニックノズル５０に直列接続するために流量計接続部２１が備えられている。図１の例では、１つの流量計２０が流量計接続部２１に接続されている。 A flowmeter connecting portion 21 is provided on the upstream side of the inspection pipe 30 with respect to the sonic nozzle 50 in order to connect one or more flowmeters 20 in series to the sonic nozzle 50. In the example of FIG. 1, one flow meter 20 is connected to the flow meter connecting portion 21.
なお、流量計接続部２１に取り付けられる流量計２０は、気体の流量を計測するものの全てが対象であり、その代表例としては、例えば、一般家庭用のガスメータや、ガス配管網の基幹路用のガスメータ、さらには、化学工場等の配管に接続される流量計等が挙げられる。また、流量計２０の計測原理は問わない。即ち、流量計２０は、例えば、超音波流量計、膜式流量計等の何れでもよく、それら以外のものであってもよい。 The flow meter 20 attached to the flow meter connection portion 21 is intended for all those that measure the flow rate of gas, and typical examples thereof are gas meters for general households and main roads of gas piping networks. Gas meters, and flow meters connected to pipes in chemical factories and the like. Further, the measurement principle of the flow meter 20 does not matter. That is, the flow meter 20 may be, for example, an ultrasonic flow meter, a membrane type flow meter, or the like, or may be something other than them.
検査用配管３０のうち流量計接続部２１より上流端部には、他の部分より内径が大きい大径管部３１Ａが設けられている。図２に示されるように、大径管部３１Ａの上流側端部と下流側端部寄り位置とには、メッシュ部材４６が張られている。なお、大径管部３１Ａのうち下流側のメッシュ部材４６より下流側部分は、テーパー状に縮径している。 A large-diameter pipe portion 31A having an inner diameter larger than that of the other portions is provided at the upstream end of the inspection pipe 30 from the flow meter connecting portion 21. As shown in FIG. 2, a mesh member 46 is stretched between the upstream end and the downstream end of the large diameter pipe portion 31A. The portion of the large-diameter pipe portion 31A on the downstream side of the mesh member 46 on the downstream side is tapered in diameter.
１対のメッシュ部材４６の間には、温度変化用ダンパー４４が収容されている。温度変化用ダンパー４４は、一般に「金属ウール」と呼ばれる金属線材であって、例えば、アルミニウム、銅、鉄、ステンレス等の線材であり、ランダムに絡んでいる。なお、線材の線径は０．０２〜０．１［ｍｍ］、密度は１５０〜３００［ｋｇ／ｍ３］になっている。 A temperature changing damper 44 is housed between the pair of mesh members 46. The temperature change damper 44 is a metal wire generally called "metal wool", for example, a wire such as aluminum, copper, iron, or stainless steel, and is entwined at random. The wire diameter of the wire rod is 0.02 to 0.1 [mm], and the density is 150 to 300 [kg / m 3 ].
なお、温度変化用ダンパー４４の代わりに「温度変化用ダンパー」として大径管部３１Ａに収容可能なものとしては、金属粒体、金属粒体を焼結してなる焼結体、又は、金属を発泡成形してなる金属発泡体、ハニカム構造体、パンチングメタル等が挙げられる。 As a "temperature change damper" instead of the temperature change damper 44, a metal particle, a sintered body obtained by sintering a metal particle, or a metal can be accommodated in the large-diameter tube portion 31A. Examples thereof include a metal foam, a honeycomb structure, and a punching metal obtained by foam molding.
温度変化用ダンパー４４と下流側のメッシュ部材４６との間には、温度変化用ダンパー４４である金属線材の飛散を防ぐためのフィルタ４５が備えられている。フィルタ４５としては、織布、不織布、グラスウールまたは、連続気泡構造を有する樹脂発泡体等が挙げられる。 A filter 45 for preventing the metal wire, which is the temperature change damper 44, from scattering is provided between the temperature change damper 44 and the mesh member 46 on the downstream side. Examples of the filter 45 include woven fabrics, non-woven fabrics, glass wool, resin foams having an open cell structure, and the like.
本実施形態の流量計検査装置１０の構成に関する説明は以上である。この流量計検査装置１０を使用して、流量計２０が以下のように検査される。図３に示すように、流量計検査装置１０は、一般的なものと同様に、気温が一定になるように空調機９１にて空調されている検査室９０内に設置され、その検査室９０内の大気が気体として吸引される。 This concludes the description of the configuration of the flow meter inspection device 10 of the present embodiment. Using this flow meter inspection device 10, the flow meter 20 is inspected as follows. As shown in FIG. 3, the flow meter inspection device 10 is installed in an inspection room 90 air-conditioned by an air conditioner 91 so that the air temperature becomes constant, and the inspection room 90 is installed in the same way as a general one. The air inside is sucked as a gas.
吸引された大気は、温度変化用ダンパー４４を通過してから検査用配管３０を介して流量計２０、ソニックノズル５０へと流れる。そして、ソニックノズル５０により検査用配管３０に基準流量の大気が流れた状態で、その流量が流量計２０にて実測される。このとき、検査用配管３０に流れた基準流量値と流量計２０が実測した値とを比較することにより、流量計２０の流量の計測精度が検査される。例えば、流量計２０の実測値と基準流量値との偏差が許容範囲にあるかどうかで判定する。 The sucked air passes through the temperature change damper 44 and then flows to the flow meter 20 and the sonic nozzle 50 through the inspection pipe 30. Then, with the reference flow rate of air flowing through the inspection pipe 30 by the sonic nozzle 50, the flow rate is actually measured by the flow meter 20. At this time, the measurement accuracy of the flow rate of the flow meter 20 is inspected by comparing the reference flow rate value flowing through the inspection pipe 30 with the value actually measured by the flow meter 20. For example, it is determined whether or not the deviation between the measured value of the flow meter 20 and the reference flow rate value is within the allowable range.
ところで、外乱により検査室９０の温度は空調機９１の設定温度から変動することがある。これに伴って検査用配管３０に入り込む大気の温度も変動する。しかしながら、本実施形態の流量計検査装置１０では、温度変化用ダンパー４４を備え、吸引された大気がまず温度変化用ダンパー４４を通過する構成となっている。温度変化用ダンパー４４は、検査室９０内の大気に比べて熱容量が大きいので、検査室９０内の大気に比べて温度は大きく変動しない。 By the way, the temperature of the inspection room 90 may fluctuate from the set temperature of the air conditioner 91 due to the disturbance. Along with this, the temperature of the atmosphere entering the inspection pipe 30 also fluctuates. However, the flow meter inspection device 10 of the present embodiment is provided with the temperature change damper 44, and the sucked air first passes through the temperature change damper 44. Since the temperature change damper 44 has a larger heat capacity than the atmosphere in the inspection room 90, the temperature does not fluctuate significantly as compared with the atmosphere in the inspection room 90.
従って、検査室９０内の大気の温度が外乱により空調機９１の設定温度から変動した温度となった場合でも、温度変化用ダンパー４４内の温度は、検査室９０内の大気ほど変動しない。これにより、検査室９０内で空調機９１の設定温度から変動した大気であっても、温度変化用ダンパー４４内に通すことによってその変動の幅を緩和することができる。即ち、本実施形態の流量計検査装置１０では、検査室９０内で空調機９１の設定温度から変動した大気が検査用配管３０に入り込んだ場合であっても、その大気を温度変化用ダンパー４４内に通すことによって温度の変動の幅を緩和してから検査用配管３０に流すことができる。 Therefore, even if the temperature of the atmosphere in the inspection room 90 fluctuates from the set temperature of the air conditioner 91 due to the disturbance, the temperature in the temperature change damper 44 does not fluctuate as much as the atmosphere in the inspection room 90. As a result, even if the atmosphere fluctuates from the set temperature of the air conditioner 91 in the inspection room 90, the fluctuation range can be mitigated by passing it through the temperature change damper 44. That is, in the flow meter inspection device 10 of the present embodiment, even when the air that has changed from the set temperature of the air conditioner 91 enters the inspection pipe 30 in the inspection room 90, the air is used by the temperature change damper 44. It is possible to relax the range of temperature fluctuation by passing it through the inside and then flow it through the inspection pipe 30.
これにより、検査用配管３０内の大気はその温度の変動の幅が緩和された状態となり、本実施形態の流量計検査装置１０では、検査用配管３０に基準流量の大気を安定的に流すことができる。また、流量計にもその温度の変動の幅が緩和された状態の大気が流れ込むので、低流量域で特に温度変化による流速分布の影響を受けやすい超音波流量計を用いた場合であっても、流量の計測値の変動を緩和することができる。即ち、本実施形態の流量計検査装置１０によれば大気の温度変化による影響を受け難くすることができる。 As a result, the air in the inspection pipe 30 is in a state in which the range of temperature fluctuation is relaxed, and in the flow meter inspection device 10 of the present embodiment, the air of the reference flow rate is stably flowed through the inspection pipe 30. Can be done. In addition, since the atmosphere in which the range of temperature fluctuation is relaxed flows into the flowmeter, even when an ultrasonic flowmeter that is particularly susceptible to the flow velocity distribution due to temperature changes is used in the low flow rate region. , Fluctuations in the measured value of the flow rate can be mitigated. That is, according to the flow meter inspection device 10 of the present embodiment, it is possible to make it less susceptible to the influence of the temperature change of the atmosphere.
ところで、外乱による温度変化とは、検査室９０内への人の出入りや他の試験装置による排熱等のような突発的に起こる温度変化、また、空調機９１のフィードバック制御による周期的な温度変化等が挙げられる。なお、フィードバック制御による温度変化では、大気の温度の平均値が一定となり、その平均値を中心に変動する。 By the way, the temperature change due to the disturbance is a sudden temperature change such as a person entering or leaving the examination room 90 or exhaust heat from another test device, or a periodic temperature due to feedback control of the air conditioner 91. Changes and the like can be mentioned. In the temperature change by feedback control, the average value of the atmospheric temperature becomes constant and fluctuates around the average value.
ここで、検査用配管３０に温度変化用ダンパー４４を備えずに検査室９０内の大気の温度変動を抑えようとすると、空調設備を主とした設備費が高額になる。これに対して、本実施形態であれば、比較的安価な温度変化用ダンパー４４を使用して、検査用配管３０を流れる大気の温度変動を抑えることができる。 Here, if the inspection pipe 30 is not provided with the temperature change damper 44 and the temperature fluctuation of the atmosphere in the inspection room 90 is suppressed, the equipment cost mainly for the air conditioning equipment becomes high. On the other hand, in the present embodiment, the temperature fluctuation of the atmosphere flowing through the inspection pipe 30 can be suppressed by using the relatively inexpensive temperature change damper 44.
しかもまた、その温度変化用ダンパー４４として「金属ウール」と呼ばれる金属線材を使用することにより、大気との接触面積を広く確保することができ、その分、温度変化用ダンパー４４をコンパクトにすることができる。 Moreover, by using a metal wire called "metal wool" as the temperature change damper 44, a wide contact area with the atmosphere can be secured, and the temperature change damper 44 can be made compact by that amount. Can be done.
さらに、大径管部３１Ａの内径が、検査用配管３０の内径に比べて大きいので、温度変化用ダンパー４４における気体との接触面積を広く確保することができ、大気の温度変化の緩和機能、即ち、ダンパー機能を高くすることができる。 Further, since the inner diameter of the large-diameter pipe portion 31A is larger than the inner diameter of the inspection pipe 30, it is possible to secure a wide contact area with the gas in the temperature change damper 44, and the function of mitigating the temperature change of the atmosphere. That is, the damper function can be enhanced.
その上、大径管部３１Ａのうち温度変化用ダンパー４４の下流側にフィルタ４５を備えているので、仮に温度変化用ダンパー４４の一部が破片となって分離してもそれをフィルタ４５にて捕捉し、流量計２０、ソニックノズル５０へと流れることを防ぐことができる。 In addition, since the filter 45 is provided on the downstream side of the temperature change damper 44 in the large diameter pipe portion 31A, even if a part of the temperature change damper 44 is separated as fragments, it can be used as the filter 45. It is possible to prevent the temperature from flowing to the flow meter 20 and the sonic nozzle 50.
［確認実験］
上記実施形態の流量計検査装置１０について、気体が検査用配管３０の上流端部に備えた温度変化用ダンパー４４を通過することによりその温度変化量が減少することを実験により確認した。この実験では、流量計検査装置１０を空調設備９１を備えた検査室９０に設置して、検査室９０内の大気を吸引して検査を行った。このとき、検査用配管３０の上流端部付近と流量計２０の下流側の検査用配管３０内とに温度計を設置し、それぞれ、温度変化用ダンパー４４を通過する前の温度（室温）Ｔ０と、温度変化用ダンパー４４を通過した後の大気の温度Ｔ１として測定した。
[Confirmation experiment]
It was experimentally confirmed that the amount of temperature change of the flow meter inspection device 10 of the above embodiment decreases as the gas passes through the temperature change damper 44 provided at the upstream end of the inspection pipe 30. In this experiment, the flow meter inspection device 10 was installed in the inspection room 90 provided with the air conditioning equipment 91, and the air in the inspection room 90 was sucked for inspection. At this time, thermometers are installed near the upstream end of the inspection pipe 30 and in the inspection pipe 30 on the downstream side of the flow meter 20, and the temperature (room temperature) T before passing through the temperature change damper 44, respectively. It was measured as 0 and the temperature T 1 of the atmosphere after passing through the temperature change damper 44.
また、検査用配管３０の内径（ｄ）を８０ｍｍ、拡管部４２の内径（Ｄ）を２００ｍｍとした。ここで、温度変化用ダンパー４４として鉄ウールを充填し、その線径は０．０３５ｍｍ、密度は２００ｋｇ／ｍ３のものを使用した。大径管部３１Ａに充填された鉄ウールの軸方向の長さ（Ｗ）は、拡管部４２の径（Ｄ）と等しくした（図２参照）。 Further, the inner diameter (d) of the inspection pipe 30 was set to 80 mm, and the inner diameter (D) of the pipe expansion portion 42 was set to 200 mm. Here, the iron wool filling as a temperature change damper 44, the wire diameter is 0.035 mm, density used was of 200 kg / m 3. The axial length (W) of the iron wool filled in the large-diameter pipe portion 31A was made equal to the diameter (D) of the pipe expansion portion 42 (see FIG. 2).
図４には、Ｔ０とＴ１の測定結果が示されている。この測定結果から、室温Ｔ０は周期的に変化し、その変化量（ΔＴ０）は約０．２℃であることがわかる。これに対して、温度変化用ダンパー４４を通過した後の大気の温度Ｔ１も同じ周期で変化しているが、その変化量（ΔＴ１）は約０．１５℃であり、温度変化量が７５％に減少したことがわかる。本実験の流量計検査装置１０では、温度変化用ダンパー４４として鉄ウールを備えることにより、室温の温度変化量に対して検査用配管３０に流れ込む大気の温度変化量が減少することが確認できた。 FIG. 4 shows the measurement results of T 0 and T 1 . From this measurement result, it can be seen that the room temperature T 0 changes periodically, and the amount of change (ΔT 0 ) is about 0.2 ° C. On the other hand, the temperature T 1 of the atmosphere after passing through the temperature change damper 44 also changes in the same cycle, but the amount of change (ΔT 1 ) is about 0.15 ° C., and the amount of temperature change is It can be seen that it decreased to 75%. In the flow meter inspection device 10 of this experiment, it was confirmed that by providing iron wool as the temperature change damper 44, the amount of temperature change in the atmosphere flowing into the inspection pipe 30 is reduced with respect to the amount of temperature change at room temperature. ..
［他の実施形態］
（１）上記実施形態では、温度変化用ダンパー４４として金属ウールを使用していたが、金属製のハニカム或いはパンチングプレートを使用してもよい。上記実施形態のように、金属ウールを使用すれば、コンパクトな構成で大気との接触面積を大きくすることができ、通過する大気との熱交換の効率を上げることが可能となる。
[Other Embodiments]
(1) In the above embodiment, metal wool is used as the temperature change damper 44, but a metal honeycomb or punching plate may be used. If metal wool is used as in the above embodiment, the contact area with the atmosphere can be increased in a compact configuration, and the efficiency of heat exchange with the passing atmosphere can be improved.
（２）上記実施形態では、温度変化用ダンパー４４と下流側のメッシュ部材４６との間に織布、不織布、グラスウールまたは、連続気泡構造を有する樹脂発泡体等で構成されるフィルタ４５を配置して、温度変化用ダンパー４４である金属線材の飛散を防止する構成であったが、温度変化用ダンパー４４を織布、不織布、グラスウールまたは、連続気泡構造を有する樹脂発泡体等で覆ったものを大径管部３１Ａのうち１対のメッシュ部材４６の間に収容する構成であってもよい。 (2) In the above embodiment, a filter 45 made of a woven fabric, a non-woven fabric, glass wool, a resin foam having an open cell structure, or the like is arranged between the temperature change damper 44 and the mesh member 46 on the downstream side. The structure was such that the metal wire rod, which is the temperature change damper 44, was prevented from scattering. However, the temperature change damper 44 was covered with a woven fabric, a non-woven fabric, glass wool, a resin foam having an open cell structure, or the like. It may be configured to be housed between a pair of mesh members 46 in the large-diameter pipe portion 31A.
１０ 流量計検査装置
２０ 流量計
２１ 流量計接続部
３０ 検査用配管
４４ 温度変化用ダンパー
５０ ソニックノズル
10 Flowmeter inspection device 20 Flowmeter 21 Flowmeter connection 30 Inspection piping 44 Temperature change damper 50 Sonic nozzle
Claims (6)
前記検査用配管のうち前記流量計接続部より上流側に充填又は嵌合されると共に内部を前記気体が通過し、その通過する前記気体の温度変化を緩和する温度変化用ダンパーを有する流量計検査装置。 Of the inspection pipes partially composed of sonic nozzles, there is a flowmeter connection part to which the flowmeter to be inspected is connected in the middle of the upstream side of the sonic nozzle, and from the upstream end of the inspection pipe. In a flow meter inspection device in which gas is sucked and the measurement accuracy of the flow meter is inspected.
A flow meter inspection having a temperature change damper that fills or fits upstream of the flow meter connection portion of the inspection pipe and allows the gas to pass through the inside to mitigate the temperature change of the passing gas. apparatus.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07110257A (en) * | 1993-10-12 | 1995-04-25 | Agency Of Ind Science & Technol | Gas meter testing device |
| JP2003065814A (en) * | 2001-08-28 | 2003-03-05 | Rikogaku Shinkokai | Instrument and method for measuring flow characteristic of equipment for gas |
| JP2006064418A (en) * | 2004-08-25 | 2006-03-09 | Rikogaku Shinkokai | Continuous nonstationary flow rate generator and continuous nonstationary flow rate generating method for compressible fluid, and flowmeter calibration device for compressible fluid |
| JP2008076134A (en) * | 2006-09-20 | 2008-04-03 | Tokyo Institute Of Technology | Continuous nonstationary flow rate generator and continuous nonstationary flow rate generating method for compressible fluid, and flowmeter calibration device for compressible fluid |
| JP2013142676A (en) * | 2012-01-12 | 2013-07-22 | Tokyo Gas Co Ltd | Apparatus and method for performing characteristic evaluation test of gas meter |
-
2019
- 2019-02-13 JP JP2019023472A patent/JP2020134160A/en active Pending
- 2019-04-29 CN CN201920611793.9U patent/CN209570256U/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07110257A (en) * | 1993-10-12 | 1995-04-25 | Agency Of Ind Science & Technol | Gas meter testing device |
| JP2003065814A (en) * | 2001-08-28 | 2003-03-05 | Rikogaku Shinkokai | Instrument and method for measuring flow characteristic of equipment for gas |
| JP2006064418A (en) * | 2004-08-25 | 2006-03-09 | Rikogaku Shinkokai | Continuous nonstationary flow rate generator and continuous nonstationary flow rate generating method for compressible fluid, and flowmeter calibration device for compressible fluid |
| JP2008076134A (en) * | 2006-09-20 | 2008-04-03 | Tokyo Institute Of Technology | Continuous nonstationary flow rate generator and continuous nonstationary flow rate generating method for compressible fluid, and flowmeter calibration device for compressible fluid |
| JP2013142676A (en) * | 2012-01-12 | 2013-07-22 | Tokyo Gas Co Ltd | Apparatus and method for performing characteristic evaluation test of gas meter |
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