CN2125129U

CN2125129U - Liquid level sensor

Info

Publication number: CN2125129U
Application number: CN 91230346
Authority: CN
Inventors: 罗季川
Original assignee: OIL AND GAS FIELDS ENGINEERING CONSTRUCTION CO SICHUAN PETROLEUM ADMINISTRATION
Current assignee: OIL AND GAS FIELDS ENGINEERING CONSTRUCTION CO SICHUAN PETROLEUM ADMINISTRATION
Priority date: 1991-12-18
Filing date: 1991-12-18
Publication date: 1992-12-16

Abstract

The utility model relates to a liquid level sensor with the character of liquid conversion. The body is newly provided with a special liquid cavity and an insulating plug. After the sensor is put in the measured liquid, the liquid level in the cavity is changed following the change of the liquid level outside the cavity. Consequently, the height position of the measured liquid level is detected. The sensor has the advantages of simple structure, high sensitivity, exact measure, reliable performance, convenient replacement and low cost. The utility model can extract and detect the height of other liquid level position at any time except measuring the limit position of the liquid level. The utility model can also be extensively applicable to the character conversion and the measurement of all the oils and the liquid with corrosiveness, toxicity and inflammability.

Description

Liquid level sensor

The utility model relates to a kind of liquid level sensor of changing liquid property, and it is made up of a special sap cavity and protective sleeve thereof and an insulating plug.

At present, put down in writing according to document, measuring method for non-conductive liquid level generally adopts the float liquid level mensuration both at home and abroad, the photoelectricity level gauge, damped vibration measurement and ultrasonic liquid level measuring method etc., but little for resembling I. C. engine oil drain pan lubricating oil liquid level, the pasta fluctuation is big, the nonconducting situation of liquid adopts buoyancy level gauge etc., complex structure, cost height and poor reliability.Chinese patent 88206545 discloses a kind of liquid level display device, and its structure is an oval glass bead, and two ends are provided with electrode, a certain amount of mercury of packing in ball.Its principle of work is that glass bead is placed in the oil sump, and an end is fixed on the height place of the limit liquid level of surveying, and the other end changes with the fluid to be measured liquid level under buoyancy.When tested liquid level reached capacity liquid level, the glass bead two ends became level, and the mercury in the ball is connected the two poles of the earth and output signal.The weak point that this device exists has, it must be contained in the oil sump, in the equipment operation process, can not take out inspection, except the extreme position energy outgoing signal of pasta, other position of liquid level can't know for sure, in addition, because the fluctuation of lubricating oil liquid level is big, the signal accuracy that the free end of glass bead fluctuates also big, measured thereupon is also poor.

The purpose of this utility model is exactly in order to change the deficiency of prior art, and the liquid level sensor of a kind of simple in structure, dependable performance, conversion liquid property highly sensitive, with low cost is provided.

The purpose of this utility model can realize by following measure: according to Pascal law, on sensor body, a kind of special sap cavity of new design, it is made up of probe, chamber wall, film bag and insulating plug, and probe is inserted in the film bag, during measurement, a kind of special liquid is housed in the sap cavity, after sensor was put into tested liquid level, the liquid level in the sap cavity changed with the variation of the static pressure that liquid level outside the chamber produces, and its inside and outside liquid level is consistent at any time.Probe with chamber wall insulation is set in special sap cavity, and when the intraluminal fluid face static pressure that outer liquid level produces with the chamber changed, special liquid just contacted or leaves with popping one's head in.With probe is a utmost point, and the chamber wall is another utmost point, at this moment makes it constitute circuit communication or disconnection with the conductivity mensuration, thereby exports the position signalling of tested liquid level indirectly.

The utility model compared with prior art, have simple in structure, measure accurate, highly sensitive, dependable performance, with low cost, do not change traditional metering system and can carry out demonstration, the control of extreme position and the advantage of reporting to the police exactly, except that the extreme position of measuring liquid level, can extract out at any time and check other liquid level position.The character conversion that this sensor can be widely used in all oils and corrosivity, toxic and flammable liquid with measure.Through on probation, respond well, have the wide prospect that promotes the use.

Concrete structure of the present utility model is provided in conjunction with the accompanying drawings by following examples.

Accompanying drawing is a structural representation of the present utility model.

The utility model is by probe wiring nut (1), insulating plug (2), and special sap cavity wall wiring nut (3), insulated handle (4), fluid level markings line (5), probe (6), chamber wall (7), film bag (8), protective sleeve (9) are formed.This sensor is equipped with a certain amount of special liquid in special chamber (A) when work.When tested liquid level is higher than the intraluminal fluid face outside the chamber, eliminate up to differential static pressure owing to film bag (8) is subjected to the effect of the differential static pressure of the inside and outside liquid level generation in chamber to be out of shape the rising of compressing intracavity liquid liquid level, otherwise intraluminal fluid face height descends.The height of the inside and outside liquid level in chamber can be consistent at any time.Probe (6) and chamber wall (7) insulation, its lower end is placed on the corresponding position of liquid level extreme position, highly then can adjust by probe wiring nut (1).When intracavity liquid rises with tested liquid level, with probe (6) when contact, be a utmost point with probe (6), chamber wall (7) be another utmost point, makes the disconnection of measurement loop.This circuit communication just can be with the limit position signal output of tested liquid level with disconnection.(5) be the outer oil ga(u)ge line of chamber wall (7), liquid measure what are indicated, (4) are insulated handle, and (2) are insulating plug, and it forms sap cavity, and make probe (6) and chamber wall (7) insulation.This sensor can be extracted the height of measuring other liquid level position by traditional measurement method out at any time except that the extreme position of measuring liquid level.

Claims

1, a kind of liquid level sensor is characterized in that it is provided with a special sap cavity (A), is made up of probe (6), chamber wall (7), film bag (8) and insulating plug (2), and probe (6) is inserted in the book bag (8), and the chamber wall is equipped with a certain amount of special liquid in (7); Probe (6) and chamber wall (7) insulation;

2, sensor according to claim 1 is characterized in that described film bag (8) outside is provided with protective sleeve (9);

3, sensor according to claim 1 is characterized in that the height of the lower end of described probe (6) can be adjusted by probe wiring nut (1) as required.