JPS6146770B2 - - Google Patents
Info
- Publication number
- JPS6146770B2 JPS6146770B2 JP8452480A JP8452480A JPS6146770B2 JP S6146770 B2 JPS6146770 B2 JP S6146770B2 JP 8452480 A JP8452480 A JP 8452480A JP 8452480 A JP8452480 A JP 8452480A JP S6146770 B2 JPS6146770 B2 JP S6146770B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- fluid
- main body
- detection surface
- strain gauge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000012530 fluid Substances 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 11
- 230000007935 neutral effect Effects 0.000 claims description 8
- 239000000446 fuel Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0001—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
- G01L9/0002—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using variations in ohmic resistance
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Description
【発明の詳細な説明】
本発明は流体圧力の検出器の改良に関し、機械
振動の影響をなくしたものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a fluid pressure detector that eliminates the influence of mechanical vibrations.
内燃機関、特にデイーゼル機関にあつては燃料
の噴射圧力が出力性能等と密接な関係があり、燃
料の圧力を正確に計測する必要がある。ところ
が、機関に直接取付けてある燃料噴射管には振動
が伝播するとともに圧力が数100Kg／cm2と高圧の
ため、ダイヤフラムタイプの圧力計のようにダイ
ヤフラム下面に大きなボリユームがある形式のも
のでは気泡が生じたり、検出遅れ等が生じ正確な
圧力測定げが出来なかつた。 In internal combustion engines, especially diesel engines, fuel injection pressure is closely related to output performance, etc., and it is necessary to accurately measure fuel pressure. However, vibrations propagate through the fuel injection pipe that is directly attached to the engine, and the pressure is as high as several 100 Kg/ cm2 , so a diaphragm-type pressure gauge with a large volume on the bottom of the diaphragm may generate air bubbles. Accurate pressure measurement was not possible due to the occurrence of errors and detection delays.
そこで、第１図に示すように、歪ゲージを用い
たものが考えられた。この圧力検出器は略直方体
状の本体１の長手方向に流体管路と連通させる流
体通路２が穿孔してあり、さらに両端部外周には
流体管路との接続を行なうための雄ねじ３が形成
してある。そして、この流体通路２内の圧力を検
出するため、本体１の一側面に凹部４が流体通路
２と平行に形成してあり、その底面を検出面とす
る。そして、この検出面に歪ゲージ５が貼付して
ある。したがつて、圧力検出を行なうには、第３
図に示すように、流体管路である燃料噴射管６の
途中に圧力検出器を配置し、本体１の両端部の雄
ねじ３を締付ナツト７で締付けて接続するととも
に、歪ゲージ５のリード線を測定器（図示省略）
に接続する。そして、圧力によつて検出面がたわ
むのでこの変形から圧力を検出する。このような
圧力検出器にあつては上述のダイヤフラムタイプ
の欠点は解消されるが、燃料噴射管６を通して圧
力検出器の両端部に伝播する機械振動によつて、
本体１の長手方向に曲げ力が作用し、その結果と
して生ずるひずみを圧力検出用の歪ゲージ５が拾
つてしまう。このため、測定波形に振動ひずみ波
形が乗つてしまい、第６図中の記号ａで示すよう
になり、測定精度の低下となり、読み取りにくい
という問題がある。 Therefore, as shown in FIG. 1, a method using a strain gauge was considered. This pressure sensor has a substantially rectangular parallelepiped main body 1 with a fluid passage 2 perforated in the longitudinal direction to communicate with the fluid pipe line, and male threads 3 formed on the outer periphery of both ends for connection with the fluid pipe line. It has been done. In order to detect the pressure within this fluid passage 2, a recess 4 is formed on one side of the main body 1 parallel to the fluid passage 2, and the bottom surface thereof is used as a detection surface. A strain gauge 5 is attached to this detection surface. Therefore, in order to detect pressure, the third
As shown in the figure, a pressure detector is placed in the middle of a fuel injection pipe 6, which is a fluid conduit, and connected by tightening the male screws 3 at both ends of the main body 1 with tightening nuts 7, and the leads of the strain gauge 5. Line measuring device (not shown)
Connect to. Since the detection surface is deflected by the pressure, the pressure is detected from this deformation. Although such a pressure sensor eliminates the above-mentioned drawbacks of the diaphragm type, mechanical vibrations propagating through the fuel injection pipe 6 to both ends of the pressure sensor cause
A bending force acts on the main body 1 in the longitudinal direction, and the resulting strain is picked up by the strain gauge 5 for pressure detection. For this reason, the vibration strain waveform is superimposed on the measurement waveform, as shown by symbol a in FIG. 6, resulting in a decrease in measurement accuracy and a problem that it is difficult to read.
本発明はかかる従来の欠点を解消し、機械振動
が伝播してくる管路途中に設けても機械振動の影
響を受けることなく圧力測定のできる圧力検出器
の提供を目的とするもので、圧力検出器の横断面
の梁断面とみなし、材料力学上の中立軸と一致す
る中立面を圧力検出器の側面に形成し、この中立
面を圧力の検出面として歪ゲージを貼付すること
で横振動の影響を受けずに中立面下を平行に貫通
する流体通路に流れる流体の圧力による変形のみ
を歪ゲージを検出するようにしたものである。 The purpose of the present invention is to eliminate such conventional drawbacks and provide a pressure detector that can measure pressure without being affected by mechanical vibration even if it is installed in the middle of a pipe where mechanical vibration propagates. By treating the cross section of the detector as a beam cross section, forming a neutral plane on the side of the pressure sensor that coincides with the neutral axis in terms of material mechanics, and attaching a strain gauge to this neutral plane as the pressure detection surface. The strain gauge is designed to detect only the deformation caused by the pressure of the fluid flowing in the fluid passage that runs parallel to the neutral plane without being affected by lateral vibration.
以下、本発明の一実施例を図面に基づき詳細に
説明する。 Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.
第４図および第５図は本発明の圧力検出器の一
実施例にかかり、第４図は縦断面図、第５図は第
４図中の−矢視断面図である。 4 and 5 show an embodiment of the pressure detector of the present invention, FIG. 4 is a longitudinal cross-sectional view, and FIG. 5 is a cross-sectional view taken along the - arrow in FIG. 4.
圧力検出器の本体１１にはその長手方向に貫通
して流体通路１２が形成してあり、高圧流体管路
途中に配設したときに流体を流し得るようにして
ある。そして、両端部外周には管路との接続をは
かるための雄ねじ１３が形成してある。また、本
体１１の中間部の一側面に凹部１４が形成される
とともに周囲が上方に突出して箱状としてある。
そして、この凹部１４の底面が圧力の検出面１５
とされ歪ゲージ１６が貼付してある。この検出面
１５は、第５図に示すように、横断面を梁断面と
みなし、材料力学上の中立軸と一致する中立面と
なるように形成してあり、中立面までの高さh1
は、第５図に示すように各部の寸法をとると次式
で与えられる。 A fluid passage 12 is formed through the main body 11 of the pressure sensor in its longitudinal direction, so that fluid can flow therethrough when the main body 11 is disposed in the middle of a high-pressure fluid conduit. A male thread 13 is formed on the outer periphery of both ends for connection with a conduit. Further, a recess 14 is formed on one side of the intermediate portion of the main body 11, and the periphery thereof protrudes upward to form a box shape.
The bottom surface of this recess 14 is a pressure detection surface 15.
A strain gauge 16 is attached. As shown in Fig. 5, this detection surface 15 is formed so that the cross section is regarded as a beam cross section, and the neutral plane coincides with the neutral axis in terms of material mechanics, and the height to the neutral plane is h 1
is given by the following equation by taking the dimensions of each part as shown in FIG.
h1＝ｂ１ｈ１ ２＋ｂ２ｈ２ ２／２（ｂ１ｈ１＋ｂ２
ｈ２）
このように構成された圧力検出器は従来同様、
高圧流体管路の途中に締付ナツトで雄ねじ１３を
利用して締付けるとともに歪ゲージ１６のリード
線を測定器に接続する。こののち、測定するが、
圧力検出器の本体１１の両端部に機械振動が伝播
して、第４図中のＭ方向に曲げ力が作用しても歪
ゲージ１６が中立面上に貼付してあるので曲げ、
ひずみを感知することなく、流体通路１２内の流
体圧力による変形だけを検出でき、第６図中の記
号ｂで示すように振動波形の乗らない波形を得る
ことができる。 h 1 = b 1 h 1 2 + b 2 h 2 2 /2 (b 1 h 1 + b 2
h2 ) The pressure detector configured in this way is similar to the conventional one,
A tightening nut is tightened in the middle of the high-pressure fluid pipeline using the male screw 13, and the lead wire of the strain gauge 16 is connected to a measuring device. After this, we will measure
Even if mechanical vibration is propagated to both ends of the pressure detector body 11 and a bending force is applied in the direction M in FIG.
It is possible to detect only the deformation caused by the fluid pressure in the fluid passage 12 without sensing strain, and it is possible to obtain a waveform without vibration waveforms, as shown by symbol b in FIG. 6.
以上、実施例とともに具体的に説明したように
本発明によれば、機械振動の影響のない圧力測定
ができ、計測精度が向上する。 As described above in detail along with the embodiments, according to the present invention, pressure can be measured without being affected by mechanical vibrations, and measurement accuracy is improved.
第１図〜第３図は従来の圧力検出器にかかり、
第１図は縦断面図、第２図は第１図中の−矢
視断面図、第３図は管路の途中に取付けた状態で
示す正面図、第４図および第５図は本発明の圧力
検出器の一実施例にかかり、第４図は縦断面図、
第５図は第４図中の−矢視断面図、第６図は
圧力測定結果を示すグラフである。
図面中、１１は本体、１２は流体通路、１３は
雄ねじ、、１４は凹部、１５は検出面、１６は歪
ゲージ、b1，b2，h1，h2は各部の寸法である。
Figures 1 to 3 apply to conventional pressure detectors,
FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along the - arrow in FIG. FIG. 4 is a longitudinal cross-sectional view of an embodiment of the pressure detector.
FIG. 5 is a sectional view taken along the - arrow in FIG. 4, and FIG. 6 is a graph showing pressure measurement results. In the drawings, 11 is the main body, 12 is a fluid passage, 13 is a male thread, 14 is a recess, 15 is a detection surface, 16 is a strain gauge, and b 1 , b 2 , h 1 , and h 2 are dimensions of each part.
Claims (1)
に歪ゲージを貼付した検出面を設けて流体の圧力
を測定する流体圧力検出器において、流体が流れ
る流体通路が穿設された本体の外側部に当該流体
通路と平行かつ横断面の中立面とほぼ一致させて
検出面を形成したことを特徴とする流体圧力検出
器。1 In a fluid pressure detector that measures fluid pressure by providing a detection surface with a strain gauge attached to the outside of the main body connected in the middle of a high-pressure fluid pipeline, the outside of the main body where a fluid passage through which fluid flows is bored. A fluid pressure detector characterized in that a detection surface is formed in the section parallel to the fluid passage and substantially coincident with the neutral plane of the cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8452480A JPS5710434A (en) | 1980-06-24 | 1980-06-24 | Fluid pressure detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8452480A JPS5710434A (en) | 1980-06-24 | 1980-06-24 | Fluid pressure detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5710434A JPS5710434A (en) | 1982-01-20 |
| JPS6146770B2 true JPS6146770B2 (en) | 1986-10-16 |
Family
ID=13833021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8452480A Granted JPS5710434A (en) | 1980-06-24 | 1980-06-24 | Fluid pressure detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5710434A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5998505A (en) * | 1982-11-26 | 1984-06-06 | Japanese National Railways<Jnr> | Super conductive current lead |
| JPS6173042A (en) * | 1984-09-19 | 1986-04-15 | Toyota Motor Corp | Internal pressure measuring instrument structure for injection pipe |
-
1980
- 1980-06-24 JP JP8452480A patent/JPS5710434A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5710434A (en) | 1982-01-20 |
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