CN2098678U

CN2098678U - Capacitance-type micro-pressure transducer

Info

Publication number: CN2098678U
Application number: CN 91217129
Authority: CN
Inventors: 陈才
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-06-24
Filing date: 1991-06-24
Publication date: 1992-03-11

Abstract

The utility model discloses a capacitance-type micro-pressure transducer, which used for measuring the tiny pressure of fluid and solves the problems that an existing capacitance type sensor has small outgoing signals, easy volatilization of evaporation aluminium on a pole plate, long-term instability, serious non-linearity resulting from capacity variation, and large zero drift. The utility model is characterized in that the right side face of a base adopts a spring leaf by argon arc welding. An air chamber is naturally formed between the base and the spring leaf. Thus, the outgoing signal is big. Connection between the wire connecting terminal of the pole plate and the electronic element on a circuit board adopts a shield wire branch for leading out. Thereby, the sensing capacity and the anti-jamming capability of the capacitance can be reinforced, and the zero drift can be decreased. A triangle is dug on the titanized pole surface of the pole plate for decreasing the generated non-linearity when the capacity varies.

Description

Capacitance-type micro-pressure transducer

The utility model belongs to a kind of capacitor, particularly a kind of condenser type micro-pressure sensor of directly measuring the fluid slight pressure with the change capacitance.

Existing capacitance type sensor, housing is connected with roll welding with the combination of diaphragm, this structure easily makes the diaphragm lattice damage, influences precision, to making output signal little, and use evaporation of aluminum on the fixed pole, volatile, long-time stability are bad, and what produced by volume change is non-linear serious, zero point drift is big, poor anti jamming capability.

The purpose of this utility model is to solve existing problem in the above-mentioned prior art, provides a kind of output signal big, the condenser type micro-pressure sensor that zero point drift is little.

The utility model is achieved in that upper shell is connected by retaining ring with drain pan, base is installed in housing, adopt spring leaf of argon arc welding in the base right side, naturally form an air chamber between base and the spring leaf, in drain pan, also be separately installed with pole plate, fixed head, wiring board and packing ring, connection terminal on the pole plate composition electronic circuit that is connected with electronic component on the wiring board, on upper shell, pass through trip bolt, gasket ring, mounting interface, interface links by the output terminal of lead and electronic circuit, in case the pressure change of the air intake opening of base, spring leaf deforms, change behind the electric capacity pole piece pressurized, change the capacity of electric capacity, convert electric signal output to by electronic circuit.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is an electronic circuit connection layout of the present utility model;

Provide embodiment of the present utility model below in conjunction with accompanying drawing:

As shown in the figure, the utlity model has drain pan 1, drain pan 1 is connected locking with upper shell 7 by retaining ring 6; Mounting seat 2, base 2 have air intake opening in drain pan 1, have groove evenly at the external diameter of base 2 with the spring leaf 10 argon arcs welding that is connected with the end, make to form an air chamber between base 2 and the spring leaf 10 naturally, the variation of air pressure can make spring leaf 10 amplitudes of variation increase, and output signal is big.In drain pan 1, also be separately installed with pole plate 3, fixed head 4, pole plate 5 and fixed head 12, between pole plate 3 and spring leaf 10, between pole plate 3 and the fixed head 4, between fixed head 4 and the pole plate 5, between pole plate 5 and the fixed head 12 packing ring 11 is installed, pole plate 3, the middle part of pole plate 5 is coated with the layer of metal titanium as pole-face, constitute sensing capacitance (C1) between the pole-face of pole plate 3 and the spring leaf 10, constitute balancing capacitance (C3) between pole plate 5 and the fixed head 4, pole plate 3, the binding post of pole plate 5 by lead respectively with wiring board on a, the b node connects (seeing wiring diagram 2), with the electronic original part diode on the wiring board 14, capacitor C 2, the electronic circuit that resistance R is formed; Wiring board 14 is fastened on the fixed head 12 by screw 15, insulating washer 13, fixed head 12 is by the screw-internal thread fit locking of external thread and base 2, owing to adopted with shielding line and drawn along separate routes, and be connected with electronic original part on the wiring board, thereby can strengthen the sensing ability, strengthen the antijamming capability of electric capacity, reduced zero point drift; Dig a triangle on the pole-face of pole plate 3 titanizings, what produce when reducing its volume change is non-linear; By trip bolt 9, gasket ring 16 mounting interfaces 8, the output terminal of electronic circuit is connected with interface 8 by lead on upper shell 7, can realize that when interface 8 links to each other with secondary instrument numeral shows.

Claims

1, a kind of condenser type micro-pressure sensor of directly measuring the fluid slight pressure with the change capacitance, comprise by the upper shell and the drain pan of retaining ring connection and form housing, base is installed in housing, pole plate, wiring board, pass through trip bolt on the upper shell, gasket ring, mounting interface, interface links by the output terminal of lead and electronic circuit, it is characterized in that having groove and end argon arc welding spring leaf 10 at the external diameter of base (2), form an air chamber between base and the spring leaf, pole plate (3), the binding post of pole plate (5) with shielding line respectively with wiring board on a, the b node connects, and has dug a triangle on the pole-face of pole plate (3) titanizing.