CN2089621U

CN2089621U - Liquid level transmitter

Info

Publication number: CN2089621U
Application number: CN 91202077
Authority: CN
Inventors: 蒋继申
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-02-02
Filing date: 1991-02-02
Publication date: 1991-11-27

Abstract

The utility model provides a liquid level transmitter. The utility model has the advantages of simple structure, stable performance, strong anti-interference ability, easy application, low cost, high measuring precision and agile measuring mode. The utility model is characterized in that a fully integrated chip composed of a transducer, a temperature compensation circuit, a signal amplifying circuit and a voltage-current steering circuit is enclosed in a cavity body composed of a cavity cover and a cavity body at a whole. Compared with the existing like products, the transmitter is suitable for hydraulic and vacuum measurement, etc.

Description

Liquid level transmitter

The utility model belongs to the level gauging technical field, the fluid level transmitter of all kinds of nothing erosion of the remote continuous coverage of particularly a kind of energy liquid.

Existing fluid level transmitter with the output of standard electric signal, generally with condenser type and throw-in type two classes for typical.The former major defect is to need before measuring fluid to be measured is drained, the capacitance when recording the container slack tank, and then the capacitance during the xylometer canful.So, when practical application, adjust difficulty, its measuring accuracy is liquid body viscosity very easily also, the influence of factors such as conductance, serviceability instability; The latter's deficiency is that the reference pressure of measuring is an atmospheric pressure, and the EC that need will be connected with subsurface equipment connects and extends more than the liquid level, thereby structure is stupid assorted, uses inconvenience.In addition, above-mentioned two class transmitters also have a common shortcoming aboveground, the down-hole two parts that are that measurement mechanism divides, generally be with signal amplify, compensated part places abovegroundly, so that causes a little less than the antijamming capability, compensates defectives such as incomplete, timely.

The purpose of this utility model is to provide a kind of simple in structure, working stability, antijamming capability strong, and measuring accuracy height and metering system be fluid level transmitter flexibly.

The utility model is at the existing product above shortcomings, a kind of design proposal of integral structure is proposed, be about to by transducer, temperature-compensation circuit, signal amplification circuit, the totally integrated chip that current/charge-voltage convertor constitutes, with overall package in the cavity that is mated, and with the vacuum chamber of transducer inside as the reference pressure of measuring, by cable directly measured value with the standard electric signal from delivered downhole to aboveground display instrument or computing machine.The transformational relation that the measuring principle of this programme is still by the static pressure of liquid internal and liquid level carries out level gauging.Shell mechanism is by the impulse mouth that is tightly connected each other, chamber lid, chamber body and sealed mouth are formed, lid tail end in chamber is connected with the chamber body and constitutes cavity, chamber lid front-end interface is a standard thread pipe, when measuring, throw-in type can be connected with pressure-inducing nozzle, when circumscribed is measured, can directly be connected with the container outer wall of fluid to be measured.Of the present utility model be characterised in that described totally integrated chip with overall package in the cavity that constitutes by chamber lid and chamber body.

The utility model has the advantages that owing to adopt integrated encapsulating structure, amplification, calibration, voltage-to-current conversion and the temperature compensation of measuring-signal all can be finished in enclosure interior simultaneously, not only can strengthen antijamming capability, to adapt to various rugged surroundings, avoid weak signal to transmit, and, compensation has fully in time improved measuring accuracy effectively.Be reference pressure because of selecting the transducer vacuum chamber for use again, simplify the structure, put use, the utility model also have working stability, metering system flexibly, low cost of manufacture and can be used for advantages such as air pressure, hydraulic pressure and vacuum measurement, have good practical values.

Below, will in conjunction with the accompanying drawings and pass through embodiment, the utility model is further described.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the totally integrated chip block scheme.

With reference to Fig. 1, Fig. 2: the utility model comprises the shell be made up of impulse mouth 1, chamber lid 2, chamber body 3, sealed mouth 4 and by transducer 5, temperature-compensation circuit 6, signal amplification circuit 7, voltage ,-totally integrated chip 9 that current conversion circuit 8 constitutes, the integral body of this chip is arranged in the cavity that is made of chamber lid and chamber body with soft encapsulating structure, one end of chip is fixing with double epoxy adhesive and chamber lid, and its periphery is provided with the buffering ring 10 that is used for shock resistance and vibrations with equally distributed; Chamber lid tail end and chamber body are tightly connected with fine thread, and its front-end interface is a standard thread pipe; The import of impulse mouth is located at the front end both lateral sides, in order to avoid the container bottom drift stops up, tail end is connected with the chamber lid with standard thread, when circumscribed is measured, can conveniently shed, and directly is connected with the container outer wall of fluid to be measured by chamber lid front port; Sealed mouth is used for drawing handling cable, and its front end periphery is provided with sealing shroud, to utilize liquid external pressure, improves gas sealing ability, and its tail end is connected with the interface end of fine thread with the chamber body.Inboard in this interface end is provided with O-ring seal.The impulse mouth of present embodiment, chamber lid, chamber body and sealed mouth are processed into by stainless steel precision, also can select aluminum alloy materials for use.Chamber body volume matches with the volume of totally integrated chip; Buffering ring is neutral silicone rubber adhesive; Sealing shroud and O-ring seal are pressed into by rubber pattern, and the transducer of present embodiment is selected the transducing chip MPX type of U.S. Mo Tuoluola company for use, and the vacuum tightness of this chip internal vacuum chamber is 1 * 10 ⁴MmHg, temperature-compensation circuit are the zero-bit temperature-compensation circuit, and signal amplification circuit is the series connection differential amplifier circuit, and the voltage-to-current translation circuit is made up of NPN triode chip.The connection of above-mentioned each circuit and debugging can be finished by the instrument and meter of routine.

Claims

1, a kind of fluid level transmitter, comprise shell of forming by impulse mouth (1), chamber lid (2), chamber body (3), sealed mouth (4) and the totally integrated chip (9) that constitutes by transducer (5), temperature-compensation circuit (6), signal amplification circuit (7), current/charge-voltage convertor (8), it is characterized in that totally integrated chip (9) with overall package in cavity by chamber lid (2), chamber body (3) formation.

2, a kind of fluid level transmitter as claimed in claim 1 is characterized in that the periphery of described totally integrated chip (9) being provided with buffering ring (10).

3, a kind of fluid level transmitter as claimed in claim 1 is characterized in that the front-end interface of described chamber lid (2) is a standard thread pipe.