CN2881560Y

CN2881560Y - Multivariable transmitter of composite sensor

Info

Publication number: CN2881560Y
Application number: CN 200620039515
Authority: CN
Inventors: 巴红伟
Original assignee: SAILSORS INSTRUMENTS CO Ltd
Current assignee: SAILSORS INSTRUMENTS CO Ltd
Priority date: 2006-02-16
Filing date: 2006-02-16
Publication date: 2007-03-21
Anticipated expiration: 2016-02-16

Abstract

A multivariable transmitter of composite sensor relates to a multivariable transmitter of composite sensor which needs to provide an integrative multivariable transmitter of composite sensor to substitute differential pressure transmitter, pressure transmitter and temperature transmitter. The utility model consists of a differential pressure sensor, a pressure sensor, a temperature sensor, a conversion circuit and a module shell.It characterizes in that: a measure module shell which adopts a ''T'' shaped cylinder and with a cover is provided; the module shell is provided with a liquid inlet; in the module chamber a step-shaped pressure chamber and a pressure sensor are arranged; the differential pressure sensor is installed by plywood in the pressure chamber; the pressure sensor is fixed tightly in the lead pressure chamber of the module; the temperature sensor is welded at the underside of the circuit board which is on the front portion of the ''T'' shaped cylinder; the lead pressure chamber of the pressure sensor is communicated with the high pressure chamber of the differential pressure sensor through a small hole, namely, communicated with the high pressure chamber of the lead structure part. The utility model is applied in the measurement of the medium differential pressure, pressure, temperature and quality flux.

Description

A kind of multivariable transmitter of compound transducer

Technical field:

The utility model relates to the multivariable transmitter of compound transducer.

Background technology

The differential pressure pick-up that the fluid media (medium) mass flow measurement uses can adopt the sensor of multiple transfer principle, as nonmetal or metal capacitance differential pressure pick-up, silicon strain bridge-type differential pressure pick-up, differential pressure pick-up forms circle outward and leans on shape, constitute by three capacity plate antenna pole plates, there is the sealing welding bellows of isolation diaphragm the pole plate outside, and two capacitor plate electrodes are drawn, and middle plate is connected with housing.; The similar double-screw bolt shape of pressure transducer external form of diffuse si resistance bridge-type conversion, hypomere has the O RunddichtringO; Temperature sensor is the thermal resistance sensor of sheet.Prior art mostly adopts a differential pressure transmitter, pressure unit, temperature transmitter, restriction device and flow integrator to be combined into a system, and signal of sensor is transferred to instrument by change-over circuit and shows and finish test.The factor affecting that the measuring accuracy of system is subjected to respectively to separate link is bigger, and simultaneously, the hardware cost of test, installation and maintenance cost and flow rate calculation software cost are bigger, causes the scheme of measuring mass rate to be difficult to promote.

The utility model content

The utility model technical issues that need to address provide a kind of integrated combined type multivariable transmitter, substitute differential pressure transmitter, pressure unit, three transmitters of temperature transmitter, are used for the test of fluid media (medium) mass rate multivariate.

The technical solution of the utility model is made up of differential pressure pick-up, pressure transducer, temperature sensor, change-over circuit and housing, the measurement module housing that it is characterized in that adopting a "T"-shaped tubular and be furnished with cover plate, module housing is provided with inlet opening, the module inner chamber has step-like pressure chamber and impulse chamber, differential pressure pick-up is installed in the pressure chamber with clamping plate, pressure transducer is anchored on lock ring in the impulse chamber of module, and temperature sensor is welded on the anterior circuit board downside of "T"-shaped tube; The impulse chamber of pressure transducer has an aperture to be communicated with the differential pressure pick-up high pressure chest, and promptly the high pressure chest with the impulse structural member is communicated with.

Because the utility model adopts the measurement module housing as integrated impulse structure, differential pressure pick-up, pressure transducer and temperature sensor are installed in the duplex measurement module, three transmitters have been replaced, use simple and flexible, easy for installation, be easy to debugging maintenance, can survey multivariates such as showing flow, measure cost and be reduced to original 20%-30%; The erection stress that integrated impulse structure decrease trip bolt causes, measurement is stable, precision is high.

Description of drawings

Fig. 1 is the multivariate differential pressure transmitter structural drawing of combined type measurement module;

Fig. 2 is the structural drawing of combined type measurement module;

Fig. 3 is existing mass flow measurement system diagram;

Fig. 4 is flow scheme figure of the present utility model;

Fig. 5 is a schematic block circuit diagram of the present utility model.

Embodiment

Below in conjunction with description of drawings embodiment of the present utility model:

Part 11 among Fig. 1 is integrated combined type measurement modules; Part 12 is housings of change-over circuit; Part 13 is indication watchcases; Part 14 is table lids; Part the 15,16,20, the 22nd, O shape circle; Part 17 is terminal assemblies; Part 18 is liquid crystal display watchs; Part 19 is communication board; Part 21 is that magnetic is adjusted assembly.

Part 1 among Fig. 2 is the impulse structural member, i.e. the measurement module housing; Part 2 is clamping plate of differential pressure pick-up; Part 3 is differential pressure pick-ups; Part 4 is cover plates of measurement module housing; Part 5 is rubber seal; Part 6 is pressure transducers; Part 7 is lock rings; Part 8 is circuit boards.

DP among Fig. 5 represents differential pressure pick-up; AP represents pressure transducer; T1 represents temperature compensation sensor; T2 represents the medium temperature sensor; The A/D plate is represented the prime measurement plate of change-over circuit; CPU board is represented signal-processing board; The LCD plate is represented display board; Terminal strip is signal, power supply web joint.

The utility model adopts measurement module housing 1 (see figure 2) and the cover plate 4 of a "T"-shaped tubular, and module housing 1 is provided with inlet opening, is provided with step-like pressure chamber and impulse chamber in the module; Differential pressure pick-up 3 usefulness clamping plate 2 are installed in the pressure chamber; The high and low pressure of the differential pressure of fluid media (medium) is received the high-low pressure chamber of module respectively through inlet opening, the medium differential pressure is delivered on the isolation diaphragm of differential pressure pick-up 3 respectively by the pressure chamber, differential pressure pick-up 3 is measured the differential pressure of fluid, and differential pressure pick-up 3 converts the differential pressure of medium to little current signal and passes to change-over circuit; Pressure transducer 6 has O-ring seal 5, and in the fastening impulse chamber that is loaded on module of lock ring 7, pressure transducer can be contained on the same silicon chip of silicon strain differential pressure sensor, also can independently install; The impulse chamber of pressure transducer 6 has an aperture to be communicated with differential pressure pick-up 3 high pressure chests, and be communicated with the high pressure chest of impulse structural member, on high-tension side pressure is gone out by the pressure transducer side, voltage signal of pressure transducer 6 outputs passes to change-over circuit, be used for the static pressure variation of differential pressure pick-up is compensated, simultaneously, the temperature correlation coefficient to medium compensates; Temperature sensor in the module cavity is welded on circuit board 8 downsides of "T"-shaped column front portion; Temperature sensor is measured the temperature around the differential pressure pick-up, and voltage signal of temperature sensor output is used for the temperature variation of differential pressure pick-up 3 is compensated; Change-over circuit housing 12 (see figure 1)s are established the triple bond formula magnetic that meets the flame proof requirement and are adjusted assembly 21; Join digital dot array formula liquid crystal display watch 18 display quality flow simultaneously in the indication watchcase 13; The change-over circuit (see figure 5) is finished the collection and the conversion of three groups of signals by the A/D plate, the A/D plate is encapsulated in the measurement module, CPU board is finished Signal Processing and compensation, the LCD plate is finished electric current, the demonstration of multiparameter reaches with the combination of adjusting key carries out configuration, adjustment to the new shape of this practicality, and terminal strip is finished the signal of power voltage supply and signal output and medium temperature sensor and imported.On integrated combined type measurement module basis, add one and be connected in external medium temperature sensor on the change-over circuit housing terminal, can be used for the temperature of medium is measured the associated media temperature coefficient of the mass rate of compensator fluid.

The pressure chamber that the utility model is used medium pressure guiding, differential pressure pick-up 3, survey in pressure transducer 6 that static pressure uses, the cavity that temperature sensor is located at module, save the screw of pressure chamber and the fastening installation of differential pressure pick-up, eliminated the output drift that erection stress that screw fastening process brings causes differential pressure pick-up.Such duplex measurement module can be stablized, accurately measure variablees such as differential pressure, pressure, temperature, has improved the synthesis precision of transmitter.

Claims

1, a kind of multivariable transmitter of compound transducer, form by differential pressure pick-up, pressure transducer, temperature sensor, change-over circuit and housing, the measurement module housing that it is characterized in that adopting a "T"-shaped tubular and be furnished with cover plate, module housing is provided with inlet opening, the module inner chamber has step-like pressure chamber and impulse chamber, differential pressure pick-up is installed in the pressure chamber with clamping plate, pressure transducer is anchored on lock ring in the impulse chamber of module, and temperature sensor is welded on the anterior circuit board downside of "T"-shaped tube; The impulse chamber of pressure transducer has an aperture to be communicated with the differential pressure pick-up high pressure chest, and promptly the high pressure chest with the impulse structural member is communicated with.

2, the multivariable transmitter of a kind of compound transducer according to claim 1 is characterized in that the change-over circuit housing is provided with triple bond formula magnetic and adjusts assembly.

3, the multivariable transmitter of a kind of compound transducer according to claim 1 and 2 is characterized in that the connection terminal of change-over circuit connects external medium temperature sensor.