CN2478101Y

CN2478101Y - Capacitor sensor of oil liquid quality detector

Info

Publication number: CN2478101Y
Application number: CN 01240388
Authority: CN
Inventors: 张钢柱; 张喆; 李佳祥
Original assignee: 张钢柱
Priority date: 2001-05-18
Filing date: 2001-05-18
Publication date: 2002-02-20
Anticipated expiration: 2011-05-18

Abstract

The utility model belongs to a capacitance sensor, especially a capacitance sensor which adopts capacitance inductance bridge circuit to measure liquid oil quality detection circuit. The utility model is characterized in that capacitance sensor adopts flat double spiral salient line structure, and the double spiral salient line is equal distance which is from 30 microns to 80 microns; the height of salient line is from 25 microns to 80 microns, and the width of salient line is from 60 microns to 160 microns. The optimal distance for the capacitance sensor double spiral salient line is from 50 microns to 70 microns; the capacity of the capacitance sensor is from 3P to 27P; the detection circuit of liquid oil quality detection instrument which is manufactured by the capacitance sensor is featured by high measurement precision, good sensitivity and wide oil product measurement scope.

Description

A kind of capacitive transducer of oil quality pick-up unit

The utility model belongs to capacitive transducer, particularly measures the capacitive transducer that the oil quality testing circuit uses about a kind of capacitor and inductor bridge circuit that adopts.

Adopt the capacitance measurement oil quality have easy to use, cost is low, high reliability features, but adopting the problem of capacitance method maximum is to exist poor repeatability, the problem that sensitivity is low; Repeatability official post instrument is manufactured the difficulty increase, cost strengthens; The low use field of having limited of sensitivity.The oil analysis instrument of the NI series that U.S. north instrument and meter company produces, be to regulate the consistance of instrument and the sensitivity of measurement by the variable capacitance that in instrument, increases by a low capacity, but, instrument is restricted to the measurement of some oil product because the sensitivity of sensor and circuit itself is not high.

The purpose of this utility model is the capacitive transducer of a kind of oil quality pick-up unit of design, and the oil quality detector testing circuit that utilizes this capacitive transducer to manufacture has the advantages that measuring accuracy height, sensitivity are good, measure the oil product wide ranges.

The technical solution of the utility model is: a kind of capacitive transducer of oil quality pick-up unit, it is characterized in that: capacitive transducer is dull and stereotyped double helix salient line structure, the double helix salient line is equidistant, spacing is chosen as 30-80 μ m, the height of raised line is 25-80 μ m, and the width of raised line is chosen in 60-160 μ m.

The double helix salient line spacing optimal selection of described capacitive transducer is 50-70 μ m.

The electric capacity of described capacitive transducer is at 3-27P.

Characteristics of the present utility model are:

Because the designed capacitive transducer of the utility model has dull and stereotyped double helical form, spacing is arranged to 30-80 μ m, the best is 50-70 μ m, lines thickness is that 25-80 μ m makes the sensitivity of instrument improve 1 times, remarkable result can detect the metal worn particle greater than 25-70 μ m, utilize the capacitive transducer of said structure to be designed to the capacitor and inductor bridge circuit, contain two capacitive transducers in the capacitor and inductor bridge circuit, a standard oil capacitive transducer, a measured oil capacitive transducer, standard oil capacitive transducer and measured oil capacitive transducer as a brachium pontis, improve measuring accuracy respectively greatly; The signal output of capacitor and inductor bridge circuit is carried out filtering through amplifying circuit amplification, filtering circuit, send Single Chip Microcomputer (SCM) system to handle by A/D converter again, so it can be achieved as follows design function;

1, surplus 180, plants oily number and storage with scrapping the index reference value, read.

2, actual measurement reading and storage between the data to result's output when, judge automatically whether oil product can continue use

3, each output ground data are removed maximal value and exceptional value for measuring in 12 groups of data, remove averaging of income value after minimum value and the exceptional value, can reduce error.

4, automatic zero set (AZS) function can be established the data error scope certainly, and instrument internal also has the zero error of setting in advance value, like this when measuring, as long as all can be defaulted as zero zero point in error range.

5, can be when artificial input oil product code name to be made mistakes, instrument can re-enter by automatically prompting user.

Below in conjunction with the embodiment accompanying drawing the utility model is described further:

Fig. 1 is the structural representation of embodiment.

Among Fig. 1, the capacitive transducer external form is dull and stereotyped double helical form, and spacing is 60 μ m, and lines thickness is 60 μ m.The electric capacity of capacitive transducer is at 23P.

Capacitive transducer is dull and stereotyped double-screw type electric capacity, they have identical structure, sensor as standard oil, no matter another is standard oil or measured oil as the sensor of measured oil, when placing in its cavity, the capacitance of capacitive transducer C1, C2 will change, L3 will change with the output voltage of the tie point of capacitor C 24 and potentiometer WR5 in parallel this moment, and the size of the variable quantity of output voltage has been reacted the model and the quality of measured oil.The model of measured oil and quality are directly shown by dot matrix LCD.

Claims

1, a kind of capacitive transducer of oil quality pick-up unit, it is characterized in that: capacitive transducer is dull and stereotyped double helix salient line structure, and the double helix salient line is that equidistantly spacing is chosen as 30-80 μ m, the height of raised line is 25-80 μ m, and the width of raised line is chosen in 60-160 μ m.

2, the capacitive transducer of a kind of oil quality pick-up unit according to claim 1 is characterized in that: the double helix salient line spacing optimal selection of capacitive transducer is 50-70 μ m.

3, the capacitive transducer of a kind of oil quality pick-up unit according to claim 1 is characterized in that: the electric capacity of described capacitive transducer is at 3-27P.