JPS62114327U

JPS62114327U -

Info

Publication number: JPS62114327U
Application number: JP143886U
Authority: JP
Priority date: 1986-01-09
Filing date: 1986-01-09
Publication date: 1987-07-21

Description

[Brief explanation of the drawing]

第１図はこの考案にかかる液面検出装置の第１
実施例を示す回路図、第２図は同じく誘導型液面
センサの縦断面図、第３図は第１図回路中の各点
の波形図、第４図は同じくその誘導型液面センサ
の出力特性図、第５図は第２実施例における誘導
型液面センサを示す縦断面図、第６図は第３実施
例を示す回路図、第７図は第４実施例を示す回路
図、第８図は従来の液面検出装置を示す概略構成
図である。１１……交流信号源、１２……誘導型液面セン
サ、１７……補正回路、１９……コア透磁率検出
回路、１２２……第１のコイル、１２４……第２
のコイル。 Figure 1 shows the first part of the liquid level detection device according to this invention.
A circuit diagram showing an embodiment, FIG. 2 is a vertical cross-sectional view of the inductive liquid level sensor, FIG. 3 is a waveform diagram at each point in the circuit of FIG. 1, and FIG. 4 is a diagram of the inductive liquid level sensor. Output characteristic diagram, FIG. 5 is a vertical cross-sectional view showing the inductive liquid level sensor in the second embodiment, FIG. 6 is a circuit diagram showing the third embodiment, FIG. 7 is a circuit diagram showing the fourth embodiment, FIG. 8 is a schematic configuration diagram showing a conventional liquid level detection device. DESCRIPTION OF SYMBOLS 11... AC signal source, 12... Inductive liquid level sensor, 17... Correction circuit, 19... Core magnetic permeability detection circuit, 122... First coil, 124... Second
coil.

Claims

[Scope of utility model registration request]

The upper coil 1221 is formed so that the winding density becomes thinner to sparser from above toward the middle point along the direction of change in the liquid level, and the winding density becomes thinner from sparse toward the bottom from the middle point. A first coil 122 that is formed in series or in parallel with a lower coil 1222 that is formed to generate magnetic flux in the opposite direction to that of the upper coil 1221, and a first coil 122 that is substantially uniform along the direction of change in the liquid level. The coils of the first or second coils 122, 124 are magnetically coupled to the second coil 124 formed at a winding density of 124 through the core 121 disposed along the coil axes of both coils. Shot rings 126, 126' to the shaft
The first or second coil 122, 124 includes an inductive liquid level sensor 12 coaxially arranged with
By connecting the AC signal source 11 to either one of the coils 122, 124, an induced electromotive force is obtained from the other of the first or second coils 122, 124, and the induced electromotive force is applied every half cycle of the AC signal source 11. In a liquid level detection device whose detection output is an effective value of a waveform obtained by detecting a waveform, a magnetic permeability detection means 19 detects the magnetic permeability of the core 121, and a detection signal from the magnetic permeability detection means 19 is used. and output correction means 17 for correcting fluctuations in the effective value due to changes in magnetic permeability of the core 121.