JPH0136091Y2

JPH0136091Y2 -

Info

Publication number: JPH0136091Y2
Application number: JP1983158670U
Authority: JP
Priority date: 1983-10-15
Filing date: 1983-10-15
Publication date: 1989-11-02
Also published as: JPS6068429U

Description

【考案の詳細な説明】〔技術分野〕この考案は、温度圧力補正装置を有する流量計
に関し、特にその温度・圧力を検出する導入口の
配置に関するものである。[Detailed Description of the Invention] [Technical Field] This invention relates to a flowmeter having a temperature and pressure correction device, and particularly relates to the arrangement of an inlet for detecting temperature and pressure.

[Prior art]

一般に液体の体積は温度あるいは圧力によつて
膨張、収縮するから、液体の流量を容積で計測し
た場合、流量の外に温度、圧力を検出し、それら
の検出値を基準温度あるいは基準圧力における容
積に換算して補正する必要がある。従来の温度圧
力補正装置を有する流量計にあつては、被計測流
体の温度と圧力の検出位置を第１図に示すように
したものが一般的である。１は被計測流体の流れ
るパイプライン、２はこのパイプライン１に設置
した流量計、３，３は流体の入口圧Pinと出口圧
Poutとの差圧により回転する一対の回転子、４
は前記流入口と流出口との間に形成した計量室
で、前記回転子を回転自在に内蔵している。とこ
ろで、より正確な計量をするためには、この変化
を常に一定の標準温度、標準圧力に於ける容積に
補正換算をして計量することが必要となる。この
補正を自動的、連続的に行うものが温度圧力補正
装置で、例えば検出した流体温度や圧力のデータ
を流量計に設けた図外の発信器により電気信号と
して補正装置に出力し、電子的に補正演算を行わ
せるようになつている。 Generally, the volume of a liquid expands or contracts depending on temperature or pressure, so when measuring the flow rate of a liquid by volume, temperature and pressure are detected in addition to the flow rate, and these detected values are used to calculate the volume at a reference temperature or pressure. It is necessary to convert and correct it. In a conventional flowmeter having a temperature and pressure correction device, the detection positions of the temperature and pressure of the fluid to be measured are generally as shown in FIG. 1 is the pipeline through which the fluid to be measured flows, 2 is the flow meter installed in this pipeline 1, and 3 and 3 are the inlet pressure Pin and outlet pressure of the fluid
A pair of rotors rotated by the differential pressure with Pout, 4
is a measuring chamber formed between the inflow port and the outflow port, which rotatably houses the rotor. By the way, in order to measure more accurately, it is necessary to always correct and convert this change into a volume at a constant standard temperature and standard pressure. A temperature-pressure correction device automatically and continuously performs this correction. For example, the detected fluid temperature and pressure data is output as an electrical signal to the correction device using a transmitter (not shown) installed in the flowmeter, and electronically The system is designed to perform correction calculations.

しかしながら、従来の流量計の温度圧力補正装
置にあつては、温度や圧力の検出口T₁，T₂やP₁，
P₂を、第１図に示すように、流量計２の出入口
部に設けている。そして補正演算には、各測定値
の算術平均値を算出して用いている。ところが圧
力を測定する場合、入口圧力P₁、出口圧力P₂は
回転子３，３の影響を受けて不規則に脈動するか
ら、検出口P₁，P₂では不安定な脈圧を測定して
しまうこととなり、正確な平均値は求め難い（第
２図参照）。このことは温度についても同様で、
計量室の流体の温度と検出口T₁，T₂での測定値
を平均して求めた温度は一致し難い。 However, in the case of the temperature and pressure correction device of the conventional flowmeter, the temperature and pressure detection ports T ₁ , T ₂ , P ₁ ,
_P2 is provided at the entrance and exit of the flowmeter 2, as shown in FIG. The arithmetic mean value of each measurement value is calculated and used for the correction calculation. However, when measuring pressure, the inlet pressure P ₁ and outlet pressure P ₂ pulsate irregularly due to the influence of the rotors 3 and 3, so the detection ports P ₁ and P ₂ measure unstable pulsating pressures. Therefore, it is difficult to obtain an accurate average value (see Figure 2). This also applies to temperature.
The temperature of the fluid in the measurement chamber and the temperature obtained by averaging the measured values at the detection ports T ₁ and T ₂ are difficult to match.

しかも温度・圧力とも２点測定をするため、測
定器もそれぞれ２個づつ必要となるとともに各測
定器が器差を有するので測定誤差が大きくなるな
どの問題点があつた。 Moreover, since both temperature and pressure are measured at two points, two measuring devices are required for each, and each measuring device has an instrumental error, resulting in a large measurement error.

[Purpose of invention]

この考案は、このような従来の問題点に着目し
てなされたもので、温度や圧力の検出口を流量計
の計量室内の流体の温度・圧力を正確に測定する
特定の個所にそれぞれ１個設けることにより上記
問題点を解決することを目的としている。 This idea was created by focusing on these conventional problems. One temperature and one pressure detection port was installed at each specific location where the temperature and pressure of the fluid in the metering chamber of the flowmeter were to be accurately measured. The purpose of this is to solve the above problems.

[Structure of the idea]

上記の目的を達成するこの考案は、流体の差圧
により回転する１対の回転子を内蔵する計量室と
その回転出力を計数部に伝える伝動室とを有する
流量計に付設し、その計数値を検出口で測定した
流体の温度と圧力に応じて補正するようにした温
度圧力補正装置をもつ流量計において、前記温度
の検出口は前記計量室の端面であつていずれか一
方のたとえば回転子がつくる計量室の頂部の中心
に近い位置に形成し、前記圧力の検出口は圧力が
計量室の圧力に等しい前記伝導室の室壁に形成し
たことを特徴とする温度圧力補正形の流量計であ
る。 This invention, which achieves the above object, is attached to a flowmeter that has a metering chamber containing a pair of rotors that rotate due to the differential pressure of the fluid, and a transmission chamber that transmits the rotational output to the counter. In a flow meter having a temperature-pressure correction device that corrects temperature and pressure according to the temperature and pressure of the fluid measured at a detection port, the temperature detection port is located at an end face of the measurement chamber and is connected to one of the rotors, for example. A temperature-pressure compensation type flowmeter characterized in that the pressure detection port is formed in a wall of the conduction chamber where the pressure is equal to the pressure in the measurement chamber. It is.

〔Example〕

第３図ないし第４図は、この考案に係る一実施
例を示す図である。図において、１１は流入口と
流出口とを有し、該流入口と流出口との間に回転
子収容空間（計量室）を形成した流量計本体、１
２は伝動室、１３は計数部、１６，１７はそれぞ
れ流体の差圧により回転する第１回転子と第２回
転子、１８は両回転子１６，１７を内蔵する計量
室、１９は前記回転子収容空間（計量室１８）の
後側を閉塞するよう流量計本体１１の一側に取り
付けた端面板、２０はこの端面板１９を押える着
脱自在の本体蓋、２１は前記回転子収容空間（計
量室１８）の前側を閉塞するよう流量計本体１１
の他側に取り付けた隔壁で、該隔壁２１により計
量室１８と伝動室１２とが仕切られている。２２
はこの隔壁２１に軸受２２ａを介して支持される
第１回転子軸、２３は同じく軸受２３ａを介して
支持される第２回転子軸、２４は上記第１回転子
軸２２の端部に一体的に配された第１回転子軸２
２に取り付けられた伝動ギヤ甲、２５はこの伝動
ギヤ２４の回転を回転出力軸２６に伝える伝導ギ
ヤ乙、２７は回転出力軸２６の先端に固着したマ
グネチツクカツプリングの主動磁石で、前記第１
回転子軸２２、第２回転子軸２３は端面板１９に
設けた軸受（図示せず）に支持されている。流体
の流量に比例する回転子１６の回転は、伝動ギヤ
甲２４により伝動室１２の伝動ギヤ乙２５に伝達
され、更に回転出力軸２６に設けた主動磁石２７
と計数部１３内の図示しない従動磁石を介して、
計数部１３に導かれ、回転速度が計測される。計
数部１３ではこの計測値を流体の流量又は流速に
換算するがその換算において、流体の温度と圧力
に関する補正が直結または遠隔の温度圧力補正装
置によつてなされる。その補正に必要な温度・圧
力のデータは温度補正装置の温度センサ及び圧力
センサで測定される。第３図中２８は圧力検出口
であり、伝動室１２の側壁１２ａに１個所形成さ
れている。圧力検出口２８は、２８ａのように伝
動室１２の端壁１２ｂに設けるようにしても良
い。計量室１８内の圧力は、計量室１８から軸受
２２ａ，２３ａ部の微少な間隙を通り伝動室１２
内に及ぶ。従つて伝動室１２内の圧力は、流量計
本体１１の出入口の丁度中間位置ではほぼ安定
し、かつ微少間隙のバツフア効果で圧力の脈動も
減衰された平均圧力となる。圧力検出口２８に装
着した圧力センサはこの理想的な圧力を検出する
こととなり、従来のように複数の箇所に設けた圧
力検出口で検出した圧力値を平均して算出する必
要もないから、従来に比し遥かに正確な補正が、
たゞ１個のセンサで可能である。２９は温度検出
口であり、計量室１８を仕切る端面板１９に１個
所形成されている。第４図の例では温度検出口２
９の中心はほゞ端面板１９の垂直中心線Ｙ上であ
つて、両回転子１６，１７のうちいずれか一方の
回転子がつくる計量室の頂部の中心位置（本体１
１寄り）となるように位置決めされている。これ
により計量室１８内の流体の平均温度を正確に測
定することができる。 FIGS. 3 and 4 are diagrams showing an embodiment of this invention. In the figure, reference numeral 11 denotes a flowmeter body having an inlet and an outlet, and a rotor housing space (measuring chamber) formed between the inlet and the outlet;
2 is a transmission chamber, 13 is a counter, 16 and 17 are a first rotor and a second rotor, respectively, which are rotated by the differential pressure of the fluid, 18 is a measuring chamber containing both rotors 16 and 17, and 19 is the rotation unit. An end plate is attached to one side of the flow meter body 11 to close the rear side of the child storage space (measuring chamber 18), 20 is a removable main body lid that presses the end plate 19, and 21 is the rotor storage space ( The flowmeter body 11 is closed so as to close the front side of the metering chamber 18).
The metering chamber 18 and the transmission chamber 12 are separated by the partition wall 21 attached to the other side. 22
is a first rotor shaft supported by this partition wall 21 via a bearing 22a, 23 is a second rotor shaft also supported via a bearing 23a, and 24 is integrated with the end of the first rotor shaft 22. The first rotor shaft 2 is arranged as follows.
2 is a transmission gear A that transmits the rotation of the transmission gear 24 to the rotational output shaft 26; 27 is a main drive magnet of a magnetic coupling fixed to the tip of the rotational output shaft 26; 1
The rotor shaft 22 and the second rotor shaft 23 are supported by bearings (not shown) provided on the end plate 19. The rotation of the rotor 16, which is proportional to the flow rate of the fluid, is transmitted to the transmission gear O 25 of the transmission chamber 12 by the transmission gear A 24, and is further transmitted to the transmission gear O 25 of the transmission chamber 12 by the main drive magnet 27 provided on the rotation output shaft 26.
and via a driven magnet (not shown) in the counting section 13,
It is led to the counting section 13 and the rotational speed is measured. The counting unit 13 converts this measured value into a flow rate or flow velocity of the fluid, and in the conversion, corrections regarding the temperature and pressure of the fluid are made by a directly connected or remote temperature and pressure correction device. The temperature and pressure data necessary for the correction are measured by a temperature sensor and a pressure sensor of the temperature correction device. Reference numeral 28 in FIG. 3 is a pressure detection port, which is formed at one location on the side wall 12a of the transmission chamber 12. The pressure detection port 28 may be provided in the end wall 12b of the transmission chamber 12 like 28a. The pressure inside the metering chamber 18 is transferred from the metering chamber 18 to the transmission chamber 12 through a minute gap between the bearings 22a and 23a.
extends within. Therefore, the pressure in the transmission chamber 12 is approximately stable at the middle position between the entrance and exit of the flowmeter main body 11, and becomes an average pressure with pressure pulsations attenuated by the buffer effect of the minute gap. The pressure sensor attached to the pressure detection port 28 will detect this ideal pressure, and there is no need to average the pressure values detected by pressure detection ports provided at multiple locations as in the past. Far more accurate correction than before,
This is possible with just one sensor. Reference numeral 29 denotes a temperature detection port, which is formed at one location on the end plate 19 that partitions the measurement chamber 18. In the example shown in Figure 4, temperature detection port 2
9 is approximately on the vertical center line Y of the end plate 19, and the center position of the top of the measuring chamber formed by one of the two rotors 16, 17 (main body 1
1). Thereby, the average temperature of the fluid within the metering chamber 18 can be accurately measured.

なお、この温度検出口２９は端面板１９の計量
室１８側からかなり深く座ぐり３０を設けてあ
る。この座ぐり３０の径は挿入する温度センサ３
１のエレメント径よりいくらか大きくして、流体
と温度センサ３１との接触面積をできる限り大き
くとるように配慮する。これにより、一層正確で
迅速な温度検知が可能となる。３２はローリン
グ、３３は取付ねじである。 The temperature detection port 29 is provided with a fairly deep counterbore 30 from the measuring chamber 18 side of the end plate 19. The diameter of this counterbore 30 is the temperature sensor 3 to be inserted.
Consideration is given to making the diameter of the element somewhat larger than that of No. 1 so that the contact area between the fluid and the temperature sensor 31 is as large as possible. This allows for more accurate and rapid temperature detection. 32 is a rolling element, and 33 is a mounting screw.

[Effect of idea]

以上説明したように、この考案によれば、流量
計の温度圧力補正装置に必要な圧力検出口を、流
量計の伝動室の室壁に形成し、温度検出口を計量
室の端面板の計量室の中心に形成するものとした
ため、１個の温度センサ及び１個の圧力センサで
正確な計測流体の温度と圧力を測定できるので、
測定流量値の正確な温度・圧力補正ができるとい
う効果が得られる。 As explained above, according to this invention, the pressure detection port required for the temperature and pressure correction device of the flowmeter is formed in the chamber wall of the transmission chamber of the flowmeter, and the temperature detection port is formed in the end plate of the measurement chamber. Since it is formed in the center of the chamber, it is possible to accurately measure the temperature and pressure of the measurement fluid with one temperature sensor and one pressure sensor.
This provides the advantage of being able to accurately correct the temperature and pressure of the measured flow rate value.

[Brief explanation of the drawing]

第１図は従来の温度圧力補正形流量計における
温度・圧力検出位置を示す図、第２図は第１図に
示すものの各部圧力状態を模式的に示す図、第３
図はこの考案に係る一実施例の従断面図、第４図
は第３図の−矢視図である。３，１６，１７……回転子、４，１８……計量
室、１２……伝動室、１２ａ，１２ｂ……（伝動
室の）室壁、１３……計数部、１９……端面板、
２８，P₁，P₂……圧力の検出口、２９，T₁，T₂
……温度の検出口。 Fig. 1 is a diagram showing the temperature/pressure detection position in a conventional temperature-pressure compensation type flowmeter, Fig. 2 is a diagram schematically showing the pressure state of each part of the one shown in Fig. 1, and Fig.
The figure is a cross-sectional view of one embodiment of this invention, and FIG. 4 is a view taken along the - arrow in FIG. 3. 3, 16, 17... Rotor, 4, 18... Measuring chamber, 12... Transmission chamber, 12a, 12b... Chamber wall (of the transmission chamber), 13... Counting section, 19... End plate,
28, P ₁ , P ₂ ... Pressure detection port, 29, T ₁ , T ₂
...Temperature detection port.

Claims

[Scope of utility model registration request]

a flowmeter body having an inlet and an outlet, and a rotor housing space formed between the inlet and the outlet;
an end plate attached to one side of the flow meter body so as to close the rear side of the rotor housing space; and a partition wall attached to the other side of the flow meter body so as to close the front side of the rotor housing space; In a flowmeter comprising a pair of rotors that are pivotally supported by the end plate and the partition wall and rotatably housed in the rotor housing space, and a transmission chamber provided adjacent to the partition wall, the side wall of the transmission chamber A flowmeter characterized in that a pressure detection port is provided in the end plate, and a temperature detection port is provided in the vicinity of the top of the metering chamber of the end plate.