CN2223485Y

CN2223485Y - Liquid level sensor for pressure container

Info

Publication number: CN2223485Y
Application number: CN 95231224
Authority: CN
Inventors: 段祥照
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-05-25
Filing date: 1995-05-25
Publication date: 1996-03-27
Anticipated expiration: 2005-05-25

Abstract

The utility model relates to a liquid level sensor for a pressure container, which comprises a case with a sealing flange and a junction box and a silicon sensor assembled in the case, wherein, the referential pressure end of the silicon sensor uses an isolation diaphragm to encapsulate compensating medium, and the positive-pressure end uses an isolation diaphragm to encapsulate protective medium; the referential pressure end is communicated with a container through an inner guiding hole and a pressure guiding hole, and the container is connected with the sealing flange; the positive-pressure end is communicated with the inner cavity of a wide-opening balancing blouse through an inner hole of a pressure guiding pipe. With the structure of single hole plunge type, the utility model not only can widen the range of measurement but also can measure the liquid level of medium with high-temperature, corrosion, thickness, inflammability, explosion and crystallization, having the advantages of easy operation, low cost and notably improvement of measurement accuracy.

Description

Band pressure vessel liquid level sensor

The utility model relates to a kind of sensor, particularly a kind of liquid level sensor that is used to measure high temperature in the band pressure vessel, burn into thickness, inflammable, explosive liquid.

At present, measure for the liquid level in the band pressure vessel, because exist the pressure that liquid-liquid produces, also have additonal pressure simultaneously, bring very burden to measuring liquid level, particularly the measurement as electric signal output is more difficult.Existing low pressure vessel level gauging mainly contains two kinds of methods, and the first adopts the differential pressure pick-up of band teletransmission flange to measure.When this method is measured, although differential pressure pick-up is contained in the middle of the container, the error that also still has the teletransmission pipe racks of teletransmission flange, general error ± more than the 1%FS.It two is the high-precision pressure sensors that adopt more than two, promptly respectively adorns the pressure transducer of a precision at ± 0.1%FS up and down at container, and composition error is more than ± 1 0%FS.Because selected pressure transducer range must be more than or equal to liquid level in the container and additonal pressure sum, and both made every error be ± 0.1%FS for the pressure transducer of this range, and with respect to liquid level error that reality reflected at more than 2 times of separate unit, two error accumulations are again the multiple relations, so error is bigger.Used flanged (FLGD) differential pressure pick-up and high-precision sensor price are all very high in the said method, will process two holes during installation at least, and troublesome poeration uses inconvenience, measures inaccurate.Can't measure for thickness, crystallized liquid, the liquid medium that is higher than 100 ℃ for temperature more can not directly be measured.

The purpose of this utility model provides a kind of band pressure vessel liquid level sensor, and it adopts single hole throw-in type structure, not only widens measurement range, can measure the liquid level of high temperature, burn into thickness, inflammable, explosive, crystallization medium, and easy and simple to handle, low cost of manufacture significantly improves measuring accuracy.

The purpose of this utility model is achieved in that this device comprises housing and the interior silicon-sensitive element of assemble case that has seal flange and terminal box; wherein the silicon-sensitive element utilizes isolation diaphragm encapsulation compensation medium with reference to pressure side; positive pressure side is utilized isolation diaphragm packaging protection medium; communicate with the container that seal flange connects by inner hole, tracting pressuring hole with reference to pressure side, positive pressure side communicates by connecting pipe endoporus, wide-mouth balance cover inner chamber.

Because the silicon-sensitive element two ends that the utility model adopts are with compensation medium and protective medium; utilize isolation diaphragm to be encapsulated in the housing that has seal flange and terminal box respectively; communicate with the reference pressure side of inner hole, flange tracting pressuring hole and the silicon-sensitive element of housing, positive pressure side by wide-mouth balance cover inner chamber, the connecting pipe endoporus that drops into; introduced the additonal pressure gaging hole; so the sensitive part of measuring is away from measured medium; both can widen measurement range; but the liquid level of pyrometry, burn into thickness, inflammable, explosive, crystallization medium can significantly improve measuring accuracy again.This in addition single hole throw-in type structure is simple in structure, easy to operate more than existing like product, so cost is low, is easy to apply.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is a kind of concrete structure synoptic diagram of the present utility model.

Describe concrete structure of the present utility model in detail according to Fig. 1.This device adopts single hole throw-in type structure.It comprises the housing 11 that has seal flange 12 and terminal box 8 and is encapsulated in diffuse si sensitive element 5 commonly used in the housing 11.Wherein the reference pressure side of silicon-sensitive element 5 is utilized ultra-thin isolation diaphragm 2 encapsulation compensation medium 1, and positive pressure side is utilized ultra-thin isolation diaphragm 10 packaging protection media 6.Communicate with the container that seal flange 12 connects by inner hole 4, flange tracting pressuring hole 7 with reference to pressure side, positive pressure side communicates by connecting pipe 13 endoporus, wide-mouth balance cover 14 inner chambers.Above-mentioned

isolation diaphragm

2,10, connecting pipe 13, wide-mouth balance cover 14 adopt resistant material to make, and compensation medium 1, protective medium 6 adopt pilot liquid silicone oil or fluorocarbon oil to be advisable.Because of balance cover 14 inner chambers that drop into container can do very big, so the sensitive part of sensitive element 5 is away from measured medium, just can measure high temperature, burn into thickness, crystallization medium liquid level, the lead-in wire glass capsulation insulator 9 and the output signal line 3 of sensitive element 5 are all tightly encapsulated, and therefore can survey inflammable, explosive medium.For making things convenient for it to observe, also can in terminal box 8, install signal amplification/display device commonly used, can observe the liquid level change situation from display panel at any time.

During use, seal flange is encapsulated in by on the measuring tape pressure vessel, when wide-mouth balance cover 14 is put into measured medium, air in wide-mouth inner chamber and connecting pipe 13 endoporus is compressed, the pressure that the measured medium liquid level produces passes to the positive pressure side of silicon-sensitive element 5, and the additonal pressure in the container passes to the reference pressure side of silicon photosensitive elements 5 by flange tracting pressuring hole 7 and inner hole 4.The electric signal of silicon-sensitive element 5 outputs this moment shows or sends into secondary instrument and handle through the signal amplification/display device of terminal box 8, can accurately measure the liquid level in the band pressure vessel.

Claims

1, a kind of band pressure vessel liquid level sensor; comprise the housing and the interior silicon-sensitive element of assemble case that have seal flange and terminal box; it is characterized in that the silicon-sensitive element utilizes isolation diaphragm encapsulation compensation medium with reference to pressure side; positive pressure side is utilized isolation diaphragm packaging protection medium; communicate with the container that seal flange connects by inner hole, tracting pressuring hole with reference to pressure side, positive pressure side communicates by connecting pipe endoporus, wide-mouth balance cover inner chamber.

2, sensor according to claim 1 is characterized in that the silicon-sensitive element output people line in the housing is encapsulated in the terminal box.

3, sensor according to claim 1 is characterized in that being equipped with in the terminal box signal amplification/display device.

4, sensor according to claim 1 is characterized in that described isolation diaphragm, connecting pipe, wide-mouth balance cover adopt resistant material to make.