JPH022629U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of this invention, FIG. 2 is a cross-sectional view of the spacer 3 shown in FIG. 1, and FIG. Fig. 4 A, B and C are respectively a plan view, an A-A side sectional view and an enlarged B-B cross sectional view of a conventional capacitive level sensor. It is.

Claims (1)

[Claims for Utility Model Registration] An elongated cylindrical outer electrode and an inner electrode are coaxially arranged, and a plurality of spacers are installed between the two electrodes at equal angular intervals when viewed from the axis. In a capacitive level sensor in which spacers are arranged in multiple stages in the longitudinal direction of the electrode, the external electrode and the internal electrode are made of metal materials having the same coefficient of linear expansion, and the spacer is connected to a substantially columnar first spacer. Second
A cylindrical electrode bush is constructed by integrally connecting a spacer in the length direction, has the same coefficient of linear expansion as the external electrode and internal electrode, and has one end closed and the other end open. is fixed to the spacer attachment position of the other electrode with the spacer facing toward one of the electrodes, one of the first or second spacers connected to each other is attached to the electrode bush, and the first and second spacers are fixed to the spacer attachment position of the other electrode. The length of each spacer l ₁ ,
The relationship α ₀ −α ₁ α ₂ −α ₀ = l ₂ l ₁ was established between the linear expansion coefficients α ₁ and α 2 of l ₂ and _the linear expansion coefficients α ₀ of both electrodes. Features a capacitive level sensor.