JPS6348295B2 - - Google Patents
Info
- Publication number
- JPS6348295B2 JPS6348295B2 JP540681A JP540681A JPS6348295B2 JP S6348295 B2 JPS6348295 B2 JP S6348295B2 JP 540681 A JP540681 A JP 540681A JP 540681 A JP540681 A JP 540681A JP S6348295 B2 JPS6348295 B2 JP S6348295B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- sensitive element
- diaphragm
- pressure sensitive
- receiving plug
- 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
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000011810 insulating material Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 4
- 239000012212 insulator Substances 0.000 description 3
- 230000036316 preload Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/0681—Protection against excessive heat
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
- G01L23/10—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by pressure-sensitive members of the piezoelectric type
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Measuring Fluid Pressure (AREA)
Description
【発明の詳細な説明】
本発明は強誘電体の圧電効果を利用した圧電式
の圧力検出器の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a piezoelectric pressure sensor that utilizes the piezoelectric effect of a ferroelectric material.
従来の圧電式の圧力検出器は、第１図に示す通
り圧力検出器本体の内側の形状を袋形状として、
この袋形状の底面に感圧素子１４を設けてある。
該感圧素子１４は、圧電体より成り、接地用の電
極１４２と出力用の電極１４１をもつ、該接地用
の電極１４２は、ダイヤフラム１５を介して接地
されている。該ダイヤフラム１５は、前記袋形状
の入口部を密封し、且つ前記感圧素子１４を直接
押圧するように設けられている。また前記感圧素
子１４の出力用電極１４１は、リード線１７を経
て電極１１に接続してある。１２は絶縁体、１３
はハウジングである。また、従来の圧電式の圧力
検出器には、第２図に示す通り感圧素子１４に予
荷重用カバー１６をかぶせ、感圧素子１４に予め
荷重をかけておいて負圧を測定することができる
ようにしたものがある。 As shown in Fig. 1, the conventional piezoelectric pressure detector has a bag-shaped inner shape.
A pressure sensitive element 14 is provided on the bottom surface of this bag shape.
The pressure sensitive element 14 is made of a piezoelectric material and has a grounding electrode 142 and an output electrode 141. The grounding electrode 142 is grounded via the diaphragm 15. The diaphragm 15 is provided to seal the bag-shaped entrance and to directly press the pressure sensitive element 14. Further, the output electrode 141 of the pressure sensitive element 14 is connected to the electrode 11 via a lead wire 17. 12 is an insulator, 13
is the housing. Furthermore, in conventional piezoelectric pressure detectors, as shown in FIG. 2, a preload cover 16 is placed over the pressure sensitive element 14, and a load is applied to the pressure sensitive element 14 in advance to measure negative pressure. There is something that allows you to do this.
本発明は前記第１図図示及び第２図図示の従来
の圧電式の圧力検出器の何れにも適用できるが、
以下主として第１図図示の圧力検出器を対象にし
て説明する。 Although the present invention can be applied to either of the conventional piezoelectric pressure detectors shown in FIG. 1 and FIG. 2,
The following description will mainly focus on the pressure detector shown in FIG.
圧力検出器は、高温の流体の圧力例えば内燃機
関のシリンダー内の燃焼圧を計測する場合には、
第３図のように取り付けることになる。第３図に
おいて、１は圧力検出器、２はシリンダーヘツ
ド、３はシール用スリーブ、４はシリンダーの燃
焼室である。この使用状態においては、第１図図
示の圧力検出器１の感圧素子１４は、高温流体と
直接接することになるので、感圧素子に多量の熱
が流入して、圧電体よりなる感圧素子１４の電極
はなれ、うき等による零点移動、感度劣化等の不
具合が生ずる。また感圧素子が極めて高温になつ
て圧電体が圧電効果を示さなくなるという不具合
も生ずる。この対策として、一般に、第４図に示
すように、水冷アダプタ５を用いてその中に圧力
検出器１を入れてその外側を冷却水流入口５１よ
り冷却水流出口５２へ矢印の如く冷却水を流して
冷却しているが、この場合には圧力検出装置とし
ては大きくなるし、冷却水が必要となり不便であ
る。 Pressure detectors are used to measure the pressure of high-temperature fluid, such as the combustion pressure in the cylinder of an internal combustion engine.
It will be installed as shown in Figure 3. In FIG. 3, 1 is a pressure detector, 2 is a cylinder head, 3 is a sealing sleeve, and 4 is a combustion chamber of the cylinder. In this state of use, the pressure-sensitive element 14 of the pressure sensor 1 shown in FIG. 1 comes into direct contact with the high-temperature fluid, and a large amount of heat flows into the pressure-sensitive element. Problems such as separation of the electrodes of the element 14, movement of the zero point due to floats, etc., and deterioration of sensitivity occur. Another problem occurs in that the pressure-sensitive element becomes extremely hot and the piezoelectric body no longer exhibits the piezoelectric effect. As a countermeasure against this, generally, as shown in FIG. 4, a water cooling adapter 5 is used, the pressure detector 1 is placed inside the adapter, and cooling water is flowed from the outside of the adapter from the cooling water inlet 51 to the cooling water outlet 52 as shown by the arrow. However, in this case, the pressure detection device becomes large and requires cooling water, which is inconvenient.
本発明はこれらの欠点を除くため、感圧素子に
流入する熱量を少なくするように圧力検出器を構
成したもので、以下本発明になる圧力検出器の実
施例を図について説明する。 In order to eliminate these drawbacks, the present invention provides a pressure detector configured to reduce the amount of heat flowing into the pressure sensitive element. Hereinafter, embodiments of the pressure detector according to the present invention will be described with reference to the drawings.
第５図は本発明になる圧力検出器の第１実施例
を示し、感圧素子１４とダイヤフラム１５との間
に、断熱材例えばセラミツクよりなる圧力媒体た
る受圧栓１８が挿設してある。また、この受圧栓
１８の外周には薄い金属膜１８１が被覆されてい
る。１１は電極、１２は絶縁体、１３はハウジン
グ、１７はリード線である。圧力検出器１は銅ワ
ツシヤー６を介してシリンダーヘツド２に螺入さ
れている。１９１はハウジング１３に設けたフラ
ンジ部、１９２は締め付けネジ部である。 FIG. 5 shows a first embodiment of the pressure detector according to the present invention, in which a pressure receiving plug 18, which is a pressure medium made of a heat insulating material such as ceramic, is inserted between a pressure sensitive element 14 and a diaphragm 15. Further, the outer periphery of the pressure receiving plug 18 is coated with a thin metal film 181. 11 is an electrode, 12 is an insulator, 13 is a housing, and 17 is a lead wire. The pressure sensor 1 is screwed into the cylinder head 2 via a copper washer 6. 191 is a flange portion provided on the housing 13, and 192 is a tightening screw portion.
次に上記圧力検出器１の作動を説明すると、内
燃機関のシリンダの燃焼室４の圧力はダイヤフラ
ム１５に加えられ、受圧栓１８を介して感圧素子
１４に伝えられる。その時熱もダイヤフラム１５
より受圧栓１８を通つて感圧素子１４に伝えられ
るが、受圧栓１８が断熱材で形成してあるため、
感圧素子１４に伝わる熱量が減少し、感圧素子１
４に熱による悪影響を与えない。 Next, the operation of the pressure detector 1 will be described. The pressure in the combustion chamber 4 of the cylinder of the internal combustion engine is applied to the diaphragm 15 and transmitted to the pressure sensing element 14 via the pressure receiving plug 18. At that time, the heat was also diaphragm 15
However, since the pressure receiving plug 18 is made of a heat insulating material,
The amount of heat transmitted to the pressure sensitive element 14 decreases, and the pressure sensitive element 1
4 will not be adversely affected by heat.
さらに、ダイヤフラム１５と感圧素子１４との
間に挿設した受圧栓に金属膜が被覆してあるから
受圧栓１８はダイヤフラム１５及び感圧素子１４
への接着が容易となり、感圧素子１４の接地用電
極１４２の取出しが容易であり、しかも、被覆し
た金属膜が薄いので熱を殆んど伝えないので受圧
栓を断熱材とした効果は失われない。さらに金属
膜を設けることによつて、受圧栓を形成する断熱
材の固定を強固にするとともに、各構成部材のも
つ熱膨張差による〓間の発生を防止することがで
きる。 Further, since the pressure receiving plug inserted between the diaphragm 15 and the pressure sensitive element 14 is coated with a metal film, the pressure receiving plug 18 is connected to the diaphragm 15 and the pressure sensitive element 14.
The grounding electrode 142 of the pressure sensitive element 14 can be easily removed, and since the coated metal film is thin, it hardly transmits heat, so the effect of using the pressure plug as a heat insulating material is lost. It won't happen. Further, by providing a metal film, it is possible to firmly fix the heat insulating material forming the pressure receiving plug, and to prevent the occurrence of gaps due to differences in thermal expansion of each component.
第６図は本発明になる圧力検出器の第２実施例
を示し、第５図図示の本発明実施例における断熱
材よりなる受圧栓１８に被覆した金属膜の中、受
圧栓１８の上端面もしくは下端面の中、一方もし
くは両方の端面の金属膜の厚さを厚くしたもの
で、他の構成は第５図図示の圧力検出器の構成と
同一である。この実施例においては、受圧栓１８
の剛性が増し、また受圧栓１８はダイヤフラム１
５及び感圧素子１４への接着の強度がより強くな
るという効果がある。 FIG. 6 shows a second embodiment of the pressure detector according to the present invention. Alternatively, the thickness of the metal film on one or both end faces of the lower end face is increased; the other configuration is the same as that of the pressure detector shown in FIG. In this embodiment, the pressure receiving plug 18
The rigidity of the pressure receiving plug 18 is increased, and the pressure receiving plug 18 is
This has the effect that the strength of adhesion to the pressure sensitive element 5 and the pressure sensitive element 14 becomes stronger.
第６図図示の本発明第２実施例を、前記第２図
図示の予荷重用カバーをかぶせた圧力検出器に適
用する場合には、第７図に示す本発明第３実施例
のように、予荷重用カバー１８２を受圧栓１８と
一体に構成することができ、工数を低減すること
もできる。 When the second embodiment of the present invention shown in FIG. 6 is applied to the pressure detector covered with the preloading cover shown in FIG. 2, the second embodiment of the present invention shown in FIG. , the preload cover 182 can be configured integrally with the pressure receiving plug 18, and the number of man-hours can also be reduced.
上述のように、本発明になる圧力検出器におい
ては、感圧素子とダイヤフラムとの間に断熱材よ
りなる受圧栓を挿設してあるから、感圧素子に伝
わる熱量が少なくなり、感圧素子が熱による損傷
を受けることがないという効果が大である。 As mentioned above, in the pressure sensor according to the present invention, since the pressure receiving plug made of a heat insulating material is inserted between the pressure sensitive element and the diaphragm, the amount of heat transmitted to the pressure sensitive element is reduced, and the pressure sensitive This has a great effect in that the element is not damaged by heat.
さらに、この受圧栓には薄い金属膜を被覆して
いるので受圧栓を感圧素子及びダイヤフラムと密
着させ易く圧電体よりなる感圧素子の接地を良好
にすることができるという効果がある。 Furthermore, since this pressure receiving plug is coated with a thin metal film, it is easy to bring the pressure receiving plug into close contact with the pressure sensitive element and the diaphragm, and there is an effect that the pressure sensitive element made of a piezoelectric material can be well grounded.
第１図及び第２図は従来の圧力検出器の構成を
示す断面図、第３図は従来の圧力検出器の使用状
態の一例を示す断面図、第４図は従来の圧力検出
器の高温対策の一例を示す断面図、第５図、第６
図及び第７図は本発明になる圧力検出器の第１、
第２及び第３実施例を示す断面図である。
１…圧力検出器、２…シリンダーヘツド、６…
銅ワツシヤ、４…シリンダー燃焼室、１４…感圧
素子、１５…ダイヤフラム、１７…リード線、１
１…電極、１４１…出力用電極、１４２…接地用
電極、１２…絶縁体、１８…断熱材よりなる受圧
栓、１８１…薄い金属膜、１８２…予荷重用カバ
ー、１３…ハウジング、２０…接地用リード線。
Figures 1 and 2 are cross-sectional views showing the configuration of a conventional pressure detector, Figure 3 is a cross-sectional view showing an example of how the conventional pressure detector is used, and Figure 4 is a high-temperature diagram of the conventional pressure detector. Cross-sectional views showing examples of countermeasures, Figures 5 and 6
7 and 7 show the first pressure detector according to the present invention,
FIG. 7 is a cross-sectional view showing second and third embodiments. 1...Pressure detector, 2...Cylinder head, 6...
Copper washer, 4...Cylinder combustion chamber, 14...Pressure sensitive element, 15...Diaphragm, 17...Lead wire, 1
DESCRIPTION OF SYMBOLS 1... Electrode, 141... Output electrode, 142... Grounding electrode, 12... Insulator, 18... Pressure receiving plug made of heat insulating material, 181... Thin metal film, 182... Preload cover, 13... Housing, 20... Grounding lead wire.
Claims (1)
て、該袋形状の底面に圧電体より成る感圧素子を
設け、前記袋形状の入口部を密封するダイヤフラ
ムを設け、該ダイヤフラムと前記感圧素子との間
に断熱材よりなりかつ薄い金属膜で被つた受圧栓
を挿設したことを特徴とする圧力検出器。 ２ 前記金属膜の中、ダイヤフラムと接する部分
もしくは感圧素子に接する部分の中、少なくもい
ずれか一方の部分の金属膜を厚くしたことを特徴
とする特許請求の範囲第１項に記載の圧力検出
器。[Scope of Claims] 1. The inside shape of the pressure detector main body is a bag shape, a pressure sensitive element made of a piezoelectric material is provided on the bottom surface of the bag shape, a diaphragm is provided to seal the entrance of the bag shape, A pressure detector characterized in that a pressure receiving plug made of a heat insulating material and covered with a thin metal film is inserted between the diaphragm and the pressure sensitive element. 2. The pressure according to claim 1, characterized in that the metal film is made thicker in at least one of the parts in contact with the diaphragm and the part in contact with the pressure-sensitive element. Detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP540681A JPS57119231A (en) | 1981-01-16 | 1981-01-16 | Pressure detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP540681A JPS57119231A (en) | 1981-01-16 | 1981-01-16 | Pressure detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57119231A JPS57119231A (en) | 1982-07-24 |
| JPS6348295B2 true JPS6348295B2 (en) | 1988-09-28 |
Family
ID=11610255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP540681A Granted JPS57119231A (en) | 1981-01-16 | 1981-01-16 | Pressure detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57119231A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013205307A (en) * | 2012-03-29 | 2013-10-07 | Citizen Finetech Miyota Co Ltd | Pressure detector and internal combustion engine with the same |
| JP2014048045A (en) * | 2012-08-29 | 2014-03-17 | Citizen Finetech Miyota Co Ltd | Combustion pressure sensor |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59113732U (en) * | 1983-01-22 | 1984-08-01 | 株式会社山武 | semiconductor pressure transducer |
| JPS60133338A (en) * | 1983-12-22 | 1985-07-16 | Nippon Denso Co Ltd | Pressure detector of internal-combustion engine |
| JPH01124537U (en) * | 1988-02-15 | 1989-08-24 |
-
1981
- 1981-01-16 JP JP540681A patent/JPS57119231A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013205307A (en) * | 2012-03-29 | 2013-10-07 | Citizen Finetech Miyota Co Ltd | Pressure detector and internal combustion engine with the same |
| JP2014048045A (en) * | 2012-08-29 | 2014-03-17 | Citizen Finetech Miyota Co Ltd | Combustion pressure sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57119231A (en) | 1982-07-24 |
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