CN2293804Y

CN2293804Y - Capacity continuous detection level meter

Info

Publication number: CN2293804Y
Application number: CN 97203196
Authority: CN
Inventors: 郭金运
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-04-14
Filing date: 1997-04-14
Publication date: 1998-10-07
Anticipated expiration: 2007-04-14

Abstract

The utility model relates to a capacitance type continuous detection level meter, comprising a capacitance-frequency or voltage converter and a capacitance type probe. The probe is composed of a metal pipe as a side pole and a metal wire as a central pole; the metal pipe is provided with a hole on a section of pipe wall, and is provided with an insulator at one end head; the metal wire is arranged at the axle wire of the metal pipe. The level meter has the advantages of simple structure, easy manufacture, convenient installation and high detecting precision.

Description

Condenser type continuous detecting liquid level instrument

The utility model relates to a kind of Level meter, particularly relates to a kind of liquid level instrument that detects in high temperature and high pressure containers.For example the synthetic ammonia container is extremely important to level gauging in chemical industry, and it is directly connected to production efficiency, is related to economic benefit of enterprises.CN2120327U (9222208.8) built-in type high pressure fluid level transmitter, plain conductor sensor probe by an outsourcing insulation, the elastic thin-wall pipe of two-layer bend fixing, high pressure sealing joint and electric capacity---current converter circuit is formed, in instructions, mention, sensing probe and liquid medium and shell of tank constitute an electric capacity, and its electric capacity is relevant with liquid level, change with the liquid level height.This patent is a kind of improvement to the fitted outside liquid level gauge, but there is a shortcoming, because this probe and high pressure vessel wall are difficult for guaranteeing the depth of parallelism when mounted, cause the variation between liquid level and the electric capacity to be nonlinear relationship, so accuracy of detection is lower, it is bigger to adjust the workload of installing, and sonde configuration is complicated.

In order to overcome above-mentioned defective, the purpose of this utility model is to improve accuracy of detection, design capacitance formula probe.Its technical scheme is: a kind of condenser type continuous detecting liquid level instrument, contain electric capacity one frequency or electric pressure converter and capacitance probe, capacitance probe has the hole by one on one section tube wall, the metal tube that insulator is equipped with in the termination is made the limit utmost point, makes center pole with the tinsel that is installed in place, metal tube axis and constitutes.

Tinsel one end is fixed on the insulator, the other end is fixed in the sealed insulation ringfeder on metal tube top, and be connected with converter detection tabs A by lead-in wire, being fixed on the chamber wall in the metal tube perforated section insertion container, the metal tube upper end is connected with the detection tabs B of converter.

Be exposed on the metal tube tube wall of external container heat radiator is housed, the end is connected with the protective cover of converter by web member and tightens up.

The output termination secondary instrument input end of converter.

The utlity model has good effect, sonde configuration is simple, makes easily, installs.The detection of this patented claim is to be the limit utmost point with the metal tubular stinger, to be installed in the tinsel of locating the tubular stinger axis is center pole, and the formed electric capacity of the liquid medium in the pipe, change with liquid level, the center pole and the limit utmost point guarantee the depth of parallelism easily in making installation, to guarantee that liquid level height and electric capacitance change are linear relationship, thereby improve accuracy of detection greatly, cost is low, and is easy for installation.

Fig. 1 is the structural representation of condenser type continuous detecting liquid level instrument;

Fig. 2 is an electric capacity in this liquid level instrument---the circuit diagram of frequency converter.

Further specify structure of the present utility model and principle of work in conjunction with the embodiments.

In Fig. 1,1 is electric capacity---frequency converter, and it just causes probe electric capacitance change amount electric signal to be converted into the frequency change signal liquid level, sends into secondary instrument, directly demonstrates the liquid level absolute altitude.The circuit of converter is seen Fig. 2.Present embodiment adopts the external relevant resistance of NE555 integrated package, electric capacity as electric capacity, freq converting circuit in Fig. 2, and 2 of A, B are the testing capacitance binding post, and A connects center pole, the B edge fit utmost point, and power supply 12V, frequency output out connects secondary instrument.2 is electric capacity frequency converter protective cover, and 3 is the protective cover joint flange, and 4 is metal tube upper end joint flange, and 5 for being exposed to the heatsink transverse device on the external container metal tube tube wall.6 is to fixedly connected flange on the metal tube with container, 7 cooperate with 6 and tighten up for container stretches out flange, 8 is the limit utmost point of metal tube as measured capacitance, insert the container metal section and have the hole, the label in hole is 14, the 9th, tinsel is to detect the electric capacity center pole, be installed in the place, axis of metal tube 8, the lower end is fixed on insulator 11 centers of metal tube end by utmost point fixator 10, the upper end is fixedly mounted on sealed insulation ringfeder 13 centers of metal tube upper end, and be connected with detection tabs A in the converter 1,15 is the hole of opening in the insulator 11, solution in the container flows into metal tube as capacitor dielectric by hole 14 and hole 15, and 12 is the output extension line hole of converter, and its output line connects the secondary instrument input end.

Claims

1, a kind of condenser type continuous detecting liquid level instrument, contain electric capacity one frequency or electric pressure converter and capacitance probe, feature of the present utility model is: capacitance probe has the hole by one on one section tube wall, the metal tube that insulator is equipped with in the termination is made the limit utmost point, makes center pole with the tinsel that is installed in place, metal tube axis and constitutes.

2, liquid level instrument according to claim 1, it is characterized in that: tinsel one end is fixed on the insulator, the other end is fixed in the sealed insulation ringfeder on metal tube top, and by the lead-in wire be connected with converter detection tabs A, the metal tube perforated section is inserted in the container and is fixed on the chamber wall, and the metal tube upper end is connected with the detection tabs B of converter.

3, liquid level instrument according to claim 1 and 2 is characterized in that: be exposed on the metal tube tube wall of external container heat radiator is housed, the end is connected with the protective cover of converter by web member and tightens up.

4, liquid level instrument according to claim 1 is characterized in that: the output termination secondary instrument input end of converter.