CN87214675U

CN87214675U - Liquid level pressure sensor with temp. compensation

Info

Publication number: CN87214675U
Application number: CN 87214675
Authority: CN
Inventors: 解喜源
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-10-22
Filing date: 1987-10-22
Publication date: 1988-08-03

Abstract

The utility model relates to a liquid level pressure sensor with temperature compensation which is suitable for detecting the liquid level and the pressure of various liquids with extensive temperature change. The liquid level pressure sensor with temperature compensation is characterized in that a transducing diaphragm can move when the temperature of the liquid level to be measured changes to ensure the constant-pressure expansion and the constant-pressure contraction of gas medium. The liquid level pressure sensor with temperature compensation can transmit a liquid level signal and a pressure signal received by the transducing diaphragm to a signal converting device in a certain distance through the gas medium in a connecting pipe, so the liquid level pressure sensor with temperature compensation can exactly check the liquid level and the pressure.

Description

Liquid level pressure sensor with temp. compensation

The utility model is a kind of liquid level that has temperature compensation, and pressure transducer is applicable to that the level value and the force value of the various liquid of temperature variation are measured on a large scale.

Chinese patent 85200077 has been described a kind of level indicator measuring device tool of fluid reservoir, is by static pressure sensor, connecting pipe, and U type pipe pressure is taken into account rule and is formed.This static pressure sensor is the hollow container of garden column type, and pressure guide hole is arranged at its top, and a hole that communicates with pot liquid is arranged at the bottom.The weak point of this static pressure sensor is when the fluid to be measured temperature raises because the gas in the static pressure sensor expands, and from base apertures the effusion portion gas, when fluid to be measured when temperature descends, because gas shrinks again, and a part of fluid to be measured is entered in the static pressure sensor by base apertures, fluid to be measured is when temperature variation, and this static pressure sensor will produce extra error, even measurement was lost efficacy.

The present invention be exactly solve have liquid level that high-temperature changes and pressure survey and constantly release convenient, safety, accurately, reliably, a kind of technical scheme cheaply.

Accompanying drawing is for the liquid level of band temperature compensation, the sketch of pressure transducer, and by housing (5) connecting pipe (6), gas medium (7), gland (1), pressure-sensitive diaphragm (8) and connector (2), (3), (4) are formed, and its each one connects sees accompanying drawing.

Pressure-sensitive diaphragm with the level pressure sensor of temperature-compensating, under the normal temperature natural conditions, be in position shown in the drawings, when the fluid to be measured temperature raises, the gas medium that is enclosed in the sensor expands outwardly owing to isobaric expansion makes pressure-sensitive diaphragm, when the fluid to be measured drop in temperature, pressure-sensitive diaphragm shrinks again because of the equipressure of gas medium and inwardly shrinks, the pressure-sensitive diaphragm that designs according to the temperature change degree, guarantee isobaric expansion and isobaric contraction of gas medium, and guarantee to be changed and the displacement of the pressure-sensitive diaphragm that causes by liquid level and pressure.

The housing (5) of liquid level, the pressure transducer of band temperature compensation is that the inner space is that taper or spherical and cylindricality combine, housing one end opening, by pressure-sensitive diaphragm (8) by sealing and fixing such as gland (1) and web member (2), (3), (4), pressure-sensitive diaphragm (8) is to adapt to maximum effectively variable volume in the housing, and the band that adopts oil resistant, high temperature resistant (40 ℃～+ 150 ℃) in an embodiment is along corrugated and cylindricality conjugate fiber fabricbase rubber diaphragm.Housing upper end has a hole and is communicated with connecting pipe (6), gas medium (7) by connecting pipe with liquid level, pressure signal transmission to liquid level, pressure signal transition processing device.Gland (1) is the circle of rectangular cross section, is fixed on the housing by its edge with pressure-sensitive diaphragm, and is provided with the three uncrossed garden of assurance pressure-sensitive diaphragm displacement posts, the limit that its length outwards moves greater than pressure-sensitive diaphragm.

Liquid level, pressure sensor with temperature-compensating may be operated in level gauging starting point place under any angular position, namely pressure-sensitive diaphragm can be arbitrarily towards. , can be pressure gauge or show and process through the analog or digital ammeter of piezoelectricity conversion at the liquid level, the pressure signal transition processing device that suitably at a distance are connected with connecting pipe.

Claims

1, a kind of liquid level that is used to measure the band temperature compensation of liquid level and pressure, pressure transducer, comprise the housing [5] that same connecting pipe [6] connects, sealing and fixing is at the pressure-sensitive diaphragm [8] at shell nozzle end place, gas medium [7] and gland [1], it is characterized in that measured variation of ambient temperature and gas medium in the sensor [7] is expanded, during contraction, constitute the variable-volume hollow container that keeps the isobaric variation of gas medium [7] by housing [5] and pressure-sensitive diaphragm [8], transmit liquid level by the gas medium [7] in the connecting pipe [6] simultaneously, pressure signal is to liquid level, the pressure signal transition processing device.

2, the liquid level of band temperature compensation as claimed in claim 1, pressure transducer, it is characterized in that housing (5) is that the inner space is taper or open containers spherical and that cylindricality combines, have a hole on the housing and be connected with connecting pipe (6), the openend of housing is sealed by pressure-sensitive diaphragm.

3,, it is characterized in that pressure-sensitive diaphragm is to be made of diaphragm corrugated or spherical and that cylindricality combines as liquid level, the pressure transducer of claim 1 and 2 described band temperature compensations.