JPS5945933B2 - Pressure sensor using magnet and crystal oscillator - Google Patents
Pressure sensor using magnet and crystal oscillatorInfo
- Publication number
- JPS5945933B2 JPS5945933B2 JP9439879A JP9439879A JPS5945933B2 JP S5945933 B2 JPS5945933 B2 JP S5945933B2 JP 9439879 A JP9439879 A JP 9439879A JP 9439879 A JP9439879 A JP 9439879A JP S5945933 B2 JPS5945933 B2 JP S5945933B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- magnet
- crystal oscillator
- magnets
- pressure vessel
- 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
- 239000013078 crystal Substances 0.000 title claims description 21
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 3
- 239000011120 plywood Substances 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
Description
【発明の詳細な説明】
本発明は、磁石と水晶振動子を使用して被測定圧力を電
気信号に変換する圧力センサに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure sensor that converts measured pressure into an electrical signal using a magnet and a crystal oscillator.
水晶振動子は、それに加わる応力によって振動周波数変
化を起すことから、圧力計、真空圧針、荷重測定器、流
量測定器などの圧力センサとして利用される。Since a crystal oscillator causes a change in vibration frequency due to stress applied thereto, it is used as a pressure sensor such as a pressure gauge, a vacuum pressure needle, a load measuring device, a flow measuring device, and the like.
本発明は、一対の磁石を同極で対向配置した受圧機構及
び緩衝用バネを介して被測定圧力で圧力容器を加圧し、
圧力容器内に設けた水晶振動子に加圧させることにより
、ホイストの荷重のように大きな圧力を広範囲に亘って
高い精度で測定することを可能とし、しかも水晶振動子
の破損を防止できる圧力センサを提供することを目的き
する。The present invention pressurizes a pressure vessel with a pressure to be measured via a pressure receiving mechanism in which a pair of magnets with the same polarity are arranged facing each other and a buffer spring.
A pressure sensor that can measure large pressures such as the load of a hoist with high accuracy over a wide range by pressurizing a crystal oscillator installed in a pressure vessel, and can also prevent damage to the crystal oscillator. The purpose is to provide.
第１図は本発明の一実施例を示し、圧力もしくは荷重を
直接に測定する圧力センサである。FIG. 1 shows an embodiment of the present invention, which is a pressure sensor that directly measures pressure or load.
受圧機構は、筒１の底部にスペーサ２で周辺を押えた磁
石３を設け、筒１を案内シリンダとして筒体４を嵌挿す
る構成とし、筒体４には磁石３と同極が対向する磁石５
を設け、筒体４を筒１に嵌挿する力向が被測定圧力を加
える力向きしている。The pressure receiving mechanism has a structure in which a magnet 3 whose periphery is held down by a spacer 2 is provided at the bottom of a cylinder 1, and a cylinder 4 is inserted into the cylinder 1 using the cylinder 1 as a guide cylinder, and the cylinder 4 has the same polarity as the magnet 3 facing magnet 5
is provided, and the direction of the force for fitting the cylinder body 4 into the cylinder 1 is the direction of the force for applying the pressure to be measured.
磁石３と筒体４の底面磁石５間には緩衝用ばね６を介在
して圧力容器７を設ける。A pressure vessel 7 is provided between the magnet 3 and the bottom magnet 5 of the cylindrical body 4 with a buffer spring 6 interposed therebetween.
圧力容器７は磁石３゜５の対向方向に伸縮可能なベロー
ズ、ゴム等で構成し、その内部空間には水晶振動子８を
設け、該水晶振動子８の電極を引出し線で外部の増幅器
９に接続する。The pressure vessel 7 is made of bellows, rubber, etc. that can be expanded and contracted in the direction opposite to the magnet 3.5, and a crystal oscillator 8 is provided in its interior space, and the electrodes of the crystal oscillator 8 are connected to an external amplifier 9 by a lead wire. Connect to.
増幅器９は水晶振動子８とで発振回路を構成し、被測定
圧力の変化に応じた周波数で発振する。The amplifier 9 constitutes an oscillation circuit with the crystal resonator 8, and oscillates at a frequency corresponding to changes in the pressure to be measured.
こうした構成の受圧機構と圧力容器吉水晶振動子と増幅
器とを有する圧力センサとすることにより、磁石３と５
（ｌ！：が極間距離の二乗に反比例した力で互いに反発
し、反発力に対する極間距離特性は第２図に示すものに
なる。By using a pressure sensor having such a configuration of a pressure receiving mechanism, a pressure vessel quartz crystal oscillator, and an amplifier, the magnets 3 and 5
(l!: repel each other with a force inversely proportional to the square of the distance between poles, and the distance between poles characteristics with respect to the repulsive force is as shown in FIG. 2.
そして磁石３に荷重Ｗが加わると、この荷重Ｗから磁極
３，５による反発力を差し引いた分の圧力がバネ６及び
圧力容器１を介して水晶振動子８に伝達されるようにな
る。When a load W is applied to the magnet 3, the pressure obtained by subtracting the repulsive force caused by the magnetic poles 3 and 5 from the load W is transmitted to the crystal oscillator 8 via the spring 6 and the pressure vessel 1.
従って、てこを利用した受圧機構を必要とすることなく
水晶振動子８の許容圧力範囲に対する被測定圧力範囲が
拡大され、広範囲の圧力測定が可能となる。Therefore, the pressure range to be measured relative to the allowable pressure range of the crystal resonator 8 is expanded without requiring a pressure receiving mechanism using a lever, and pressure measurement over a wide range becomes possible.
また、磁石３に加わる衝撃は緩衝用バネ６により緩和さ
れ、更に圧力容器７内の空気によって緩和されるため、
機械的強度の弱い水晶振動子を破損するこさがなくなる
。In addition, since the shock applied to the magnet 3 is alleviated by the buffer spring 6 and further by the air inside the pressure vessel 7,
This eliminates the risk of damaging the crystal resonator, which has weak mechanical strength.
また、磁石３゜５としては残留磁束密度が長期間安定し
ている点、保持力が大きい点、容易且つ安価に作れる点
等から希土類コバルト磁石を用いることが好ましい。Further, as the magnet 3.5, it is preferable to use a rare earth cobalt magnet because the residual magnetic flux density is stable for a long period of time, the holding force is large, and the magnet can be manufactured easily and inexpensively.
第３図は本発明の他の実施例を示し、真空圧計に適用し
た場合である。FIG. 3 shows another embodiment of the present invention, which is applied to a vacuum pressure gauge.
同図においては、合板１０に一刀の磁石３を設け、台板
１０に植設した案内棒１１で案内される可動板１２に他
方の磁石５を設け、可動板１２譜台板１０とはベローズ
１３で結合して受圧機構を構成する。In the figure, one magnet 3 is provided on a plywood board 10, and the other magnet 5 is provided on a movable plate 12 guided by a guide rod 11 installed in the base plate 10, and the movable plate 12 and the music base plate 10 are made of bellows. 13 to form a pressure receiving mechanism.
磁石３と５との極間には第１図の場合と同様にばね６を
介在して圧力容器１、該容器内に水晶振動子８を設け、
水晶振動子８の電極引出し線を増幅器９に導出している
。A spring 6 is interposed between the poles of the magnets 3 and 5, as in the case of FIG. 1, and a pressure vessel 1 is provided, and a crystal oscillator 8 is provided within the vessel.
Electrode lead lines of the crystal resonator 8 are led out to an amplifier 9.
こうした圧力センサは、真空容器１４の孔１４Ａ部分に
シール１５を介在して合板１０で覆い、真空容器１４内
の真空圧を孔１４Ａ及び台板１０の導入口１０Ａを通し
てベローズ１３内に導き、真空圧に応じて可動板１２を
容器側に引張り、水晶振動子８を加圧する。Such a pressure sensor is constructed by covering the hole 14A of the vacuum container 14 with a seal 15 and plywood 10, guiding the vacuum pressure inside the vacuum container 14 into the bellows 13 through the hole 14A and the inlet 10A of the base plate 10, and The movable plate 12 is pulled toward the container in accordance with the pressure, and the crystal resonator 8 is pressurized.
本実施例においても、前述のものと同等の作用効果を奏
する。This embodiment also provides the same effects as those described above.
以上のように本発明によれば、水晶振動子を利用して圧
力を検出すると共に、互に反発する磁極間に緩衝用のバ
ネを介して圧力容器を設け、この圧力容器の中に水晶振
動子を配置した構成としているため、大きな圧力を広範
囲に亘って精度よく測定することができ、しかも緩衝用
のバネ及び圧力容器を用いていることから、水晶振動子
の破損を防止することができる。As described above, according to the present invention, pressure is detected using a crystal oscillator, a pressure vessel is provided between mutually repelling magnetic poles with a buffer spring interposed therebetween, and a crystal oscillator is provided in the pressure vessel. Due to the structure in which the crystal oscillator is arranged, it is possible to measure large pressures over a wide range with high accuracy, and since it uses a buffer spring and pressure vessel, it is possible to prevent damage to the crystal resonator. .
第１図は本発明の一実施例を示す側断面図、第２図は反
発力に対する磁石間距離の特性図、第３図は本発明の他
の実施例を示す側断面図である。
３．５・・・磁石、６・・・ばね、１・・・圧力容器、
８・・・水晶振動子、９・・・増幅器、１０・・・台板
、１１・・・案内棒、１２・・・可動板、１３・・・ベ
ローズ、１４・・・真空容器。FIG. 1 is a side sectional view showing one embodiment of the present invention, FIG. 2 is a characteristic diagram of the distance between magnets with respect to repulsive force, and FIG. 3 is a side sectional view showing another embodiment of the present invention. 3.5... Magnet, 6... Spring, 1... Pressure vessel,
8... Crystal resonator, 9... Amplifier, 10... Base plate, 11... Guide rod, 12... Movable plate, 13... Bellows, 14... Vacuum container.
Claims (1)
向に被測定圧力を受圧案内する受圧機構と、上記一対の
磁石の極間に配置し該磁石の極間方向に加わる力に応じ
た内圧を発生する圧力容器さ、前記一対の磁石の間に、
前記圧力容器を挾持して前記極間方向に加わる力を当該
圧力容器に伝達する緩衝用バネと、この圧力容器内に配
置しその内圧変化に応じた振動周波数を得る水晶振動子
とを備えたことを特徴とする圧力センサ。1. A pressure receiving mechanism that has a pair of magnets with the same poles facing each other and receives and guides the pressure to be measured in the opposite direction of the magnets, and a pressure receiving mechanism that is located between the poles of the pair of magnets and responds to the force applied in the direction between the poles of the magnets. a pressure vessel that generates an internal pressure, between the pair of magnets,
A buffer spring that clamps the pressure vessel and transmits a force applied in the direction between the poles to the pressure vessel, and a crystal oscillator that is disposed within the pressure vessel and obtains a vibration frequency according to changes in the internal pressure. A pressure sensor characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9439879A JPS5945933B2 (en) | 1979-07-24 | 1979-07-24 | Pressure sensor using magnet and crystal oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9439879A JPS5945933B2 (en) | 1979-07-24 | 1979-07-24 | Pressure sensor using magnet and crystal oscillator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5618736A JPS5618736A (en) | 1981-02-21 |
| JPS5945933B2 true JPS5945933B2 (en) | 1984-11-09 |
Family
ID=14109149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9439879A Expired JPS5945933B2 (en) | 1979-07-24 | 1979-07-24 | Pressure sensor using magnet and crystal oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5945933B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR8307685A (en) * | 1983-01-31 | 1984-12-11 | Sweeney Theodore Co | ADHESIVE FIXABLE HOLDER |
| KR100435255B1 (en) * | 2002-08-13 | 2004-06-11 | 주식회사 파세코 | Pressure Measuring Structure of Hot Air Generator |
-
1979
- 1979-07-24 JP JP9439879A patent/JPS5945933B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5618736A (en) | 1981-02-21 |
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