CN103344384B - Pressure fluctuation calibration device of differential pressure sensor - Google Patents

Pressure fluctuation calibration device of differential pressure sensor Download PDF

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Publication number
CN103344384B
CN103344384B CN201310291402.7A CN201310291402A CN103344384B CN 103344384 B CN103344384 B CN 103344384B CN 201310291402 A CN201310291402 A CN 201310291402A CN 103344384 B CN103344384 B CN 103344384B
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China
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pressure
cylinder body
piston
frame
pipelines
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CN201310291402.7A
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CN103344384A (en
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王勇
刘正士
刘焕进
毕荣
陆益民
揭得算
陈品
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Hefei University of Technology
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Hefei University of Technology
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Abstract

The invention discloses a pressure fluctuation calibration device of a differential pressure sensor. The pressure fluctuation calibration device comprises a main pressure container, a standard pressure sensor connected onto the main pressure container, a machine frame and a cylinder body fixedly arranged on the machine frame. The bottom of the inner cavity of the cylinder body is communicated with the main pressure container through a second pipeline. The upper portion of the cylinder body is provided with a piston, a guide flange is fixedly arranged on an outer wall of the top of a piston rod and uses a column of the machine frame as a guide rail, and a displacement sensor is arranged on the guide flange. A transmission mechanism driving the piston rod to operate vertically is arranged at the top of the machine frame. The pressure fluctuation calibration device and a calibration method meet the demand for pressure fluctuation calibration of the differential pressure sensor in a usual scene environment.

Description

The pressure fluctuation calibration device of differential pressure pick-up
Technical field:
The present invention relates to caliberating device and the scaling method of fluid pressure sensor, particularly relate to pressure fluctuation calibration device and the scaling method thereof of a kind of simple, convenient, accurate hydrodynamic pressure or differential pressure pick-up.
Background technology:
Pressure is one of fluid most basic parameter, and the pressure surge under certain pressure or differential pressure is measured and all seemed extremely important in a lot of fields, and the pressure fluctuation calibration of pressure or differential pressure pick-up is unusual the key link; But, still lack now simple, convenient and accurate pressure fluctuation calibration device and corresponding scaling method.Existing two kinds of scaling methods: wherein a kind of pressure calibration mode provides pressure by forcing pump, shown the pressure size of generation again by the pressure transducer of standard, the method needs more utility appliance, needs larger working environment, energy consumption is comparatively large, carries inconvenience; The pressure size that the method produces mainly controls by surplus valve and forcing pump, the more difficult fine adjustments realizing pressure size; Simultaneously, the pressure size of the method is shown by the pressure transducer of standard, tonometric precision is determined by the precision of the pressure transducer of standard completely, when not using expensive standard pressure transducer, is the pressure fluctuation calibration requirement being difficult to reach pressure or differential pressure pick-up.Wherein another kind of pressure calibration method is piston type, the size that ratio obtains pressure is carried out by the quality of counterweight and the sectional area of piston, need to eliminate the frictional resistance be carried on piston to improve measuring accuracy, assisted rotating mechanism is adopted to make to form lubricating oil film between piston and cylinder body, reduce friction factor, this piston-type pressure device utility appliance is more, higher to environmental requirement, cost is very high, is difficult to widespread use.
Summary of the invention:
For overcoming the defect of prior art, the object of the present invention is to provide a kind of simple, convenience, accurate pressure apparatus and scaling method, meeting the pressure of usual site environment or the pressure fluctuation calibration needs of differential pressure pick-up.
Technical solution problem of the present invention adopts following technical scheme:
The pressure fluctuation calibration device of pressure transducer, comprising:
Principal pressure container and the standard pressure transducer be connected on described principal pressure container and pressure transducer to be calibrated;
Frame and the cylinder body be installed in described frame, the intracavity bottom of described cylinder body is by No. two pipelines and described principal pressure reservoir;
The top of described cylinder body is provided with piston, and the top exterior walls of piston rod has been fixedly arranged on guide flange, and described guide flange for guide rail, and is provided with displacement transducer between guide flange and guide rail with the column of described frame;
The top of described frame is provided with the gear train driving described piston rod to run up and down.
The epimere hollow of described piston rod is also provided with internal thread, and the top of described frame is provided with the leading screw mated with described internal thread, and the top of frame is also provided with and controls motor, reductor and shaft coupling, and top and the described shaft coupling of described leading screw connect firmly.
For the pressure fluctuation calibration of differential pressure pick-up, the scheme that the present invention adopts is:
The pressure fluctuation calibration device of differential pressure pick-up, it comprises:
Principal pressure container and the standard pressure transducer be connected on described principal pressure container;
Frame and the cylinder body be installed in described frame, the intracavity bottom of described cylinder body is by No. two pipelines and described principal pressure reservoir;
The top of described cylinder body is provided with piston, and the top exterior walls of piston rod has been fixedly arranged on guide flange, and described guide flange for guide rail, and is provided with displacement transducer between guide flange and guide rail with the column of described frame;
The top of described frame is provided with the gear train driving described piston rod to run up and down;
Arrange auxiliary pressure vessel, the inner chamber being communicated with No. three pipelines bottom auxiliary pressure vessel and described No. two pipelines and described cylinder body forms threeway, and described No. three pipelines are provided with the second valve;
The top of described auxiliary pressure vessel by a pipeline and described principal pressure reservoir, and is provided with the first valve and differential pressure pick-up to be calibrated on a described pipeline.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, adopt piston displacement Fluid Computation pressure, thus need not consider the frictional resistance being carried in piston, need not add the rotating mechanism eliminating frictional resistance, without pump valve, make this pressure apparatus simple, easy to carry, cost reduces;
2, control motor, speed reduction unit, shaft coupling and screw-rod-driven and piston bar is adopted, by the displacement transducer with piston rod synchronous shift, can the displacement size of control piston movement accurately and easily, thus accurately control the volume change of fluid, finally reach the pressure change accurately controlling fluid, need not pump be regulated, or change counterbalance mass, make this pressure apparatus easy to use, and required quite accurate pressure can be produced.
3, set up the relation between piston displacement and pressure by curve, without pump, need not be equipped with expensive demarcation pressure transducer, without the counterweight assembly of outfit standard, make this pressure measurement method practicality wider, installation cost reduces, simple to operate.
4, adopt displacement transducer to measure pressure, the pressure survey resolution higher than standard pressure transducer can be obtained, better meet the pressure fluctuation calibration requirement of pressure under certain pressure or differential pressure pick-up.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of apparatus of the present invention.
Number in the figure: 1 principal pressure container, 2 standard pressure transducer, 3 pressure transducers to be calibrated, 4 cylinder bodies, 5 No. two pipelines, 6 guide flanges, 7 columns, 8 displacement transducers, 9 piston rods, 10 leading screws, 11 control motor, 12 reductors, 13 shaft couplings, 14 auxiliary pressure vessel, 15 No. three pipelines, 16 second valves, No. 17 pipelines, 18 second valves, 19 differential pressure pick-ups to be calibrated.
Below by way of embodiment, and the invention will be further described by reference to the accompanying drawings.
Embodiment:
Embodiment 1: see Fig. 1, the pressure surge for pressure transducer is demarcated, and its device comprises:
Principal pressure container 1 and the standard pressure transducer 2 be connected on principal pressure container and pressure transducer to be calibrated 3;
Frame and the cylinder body 4 be installed in frame, the intracavity bottom of cylinder body 4 is communicated with principal pressure container 1 by No. two pipelines 5; Be provided with piston on the top of cylinder body 4, seal between piston and inboard wall of cylinder block, piston moves up and down the fluid level lifting driven in inner chamber of cylinder block, makes the hydrodynamic pressure in principal pressure container produce fluctuation.The top exterior walls of the piston rod 9 of described piston has been fixedly arranged on guide flange 6, guide flange 6 with the column 7 of frame for guide rail, and on guide flange, be provided with displacement transducer 8, the epimere hollow of piston rod 9 is also provided with internal thread, the top of frame is provided with the leading screw 10 mated with internal thread, the top of frame is also provided with and controls motor 11, reductor 12 and shaft coupling 13, and top and the shaft coupling 13 of leading screw 10 connect firmly.During work, drive leading screw 10 to rotate by control motor, leading screw only rotates not upper and lower displacement, therefore can be moved up and down by screw-rod-driven and piston bar.
Adopt this device to carry out the method for pressure fluctuation calibration to pressure transducer, carry out as follows during operation:
A, pressure transducer 3 to be calibrated is arranged on principal pressure container 1;
B, startup control motor 11, leading screw 10 is driven to rotate by reductor 12, shaft coupling 13, leading screw 10 drives piston rod 9 descending, according to the range of pressure transducer 3 to be calibrated, select some different spot pressures be distributed in range pressure range, mobile piston, until the pressure that standard pressure transducer 2 shows reaches the pressure of the full scale of pressure transducer 3 to be calibrated from zero pressure;
C, write down shift value on the force value of different pressures point and the displacement transducer 8 of correspondence thereof respectively, with described shift value for horizontal ordinate, take force value as ordinate, in rectangular coordinate system, mark the shift value of displacement transducer display and corresponding to force value one group of coordinate points of respective standard pressure transducer display, use this group coordinate points of curve again, the relation between the pressure setting up piston displacement and principal pressure container;
D, the pressure surge under authorised pressure will measured according to pressure transducer to be calibrated, the first step, the mobile piston of Large travel range, makes the numerical value of display in standard pressure transducer 2 reach authorised pressure; Second step, according to the relation between the pressure of the piston displacement of having set up and principal pressure container, the shift value of piston is obtained by the size of pressure surge, micro-mobile piston again, just required slight pressure fluctuation can be produced, obtain the slight pressure fluctuation that standard pressure transducer cannot be measured, realize the demarcation treating the pressure surge of nominal pressure sensor.
Embodiment 2: for the pressure fluctuation calibration of differential pressure pick-up, its device comprises:
Principal pressure container 1 and the standard pressure transducer 2 be connected on principal pressure container;
Frame and the cylinder body 4 be installed in frame, the intracavity bottom of cylinder body 4 is communicated with principal pressure container 1 by No. two pipelines 5; Be provided with piston on the top of cylinder body 4, seal between piston and inboard wall of cylinder block, piston moves up and down the fluid level lifting driven in inner chamber of cylinder block, makes the hydrodynamic pressure in principal pressure container produce fluctuation.The top exterior walls of the piston rod 9 of described piston has been fixedly arranged on guide flange 6, guide flange 6 with the column 7 of frame for guide rail, and on guide flange, be provided with displacement transducer 8, the epimere hollow of piston rod 9 is also provided with internal thread, the top of frame is provided with the leading screw 10 mated with internal thread, the top of frame is also provided with and controls motor 11, reductor 12 and shaft coupling 13, and top and the shaft coupling 13 of leading screw 10 connect firmly.During work, drive leading screw 10 to rotate by control motor, leading screw only rotates not upper and lower displacement, therefore can be moved up and down by screw-rod-driven and piston bar.
Arrange auxiliary pressure vessel 14 in addition, the inner chamber being communicated with No. three pipelines 15 bottom auxiliary pressure vessel 14 and No. two pipelines 5 and cylinder body forms threeway, and No. three pipelines 15 are provided with the second valve 16;
The top of auxiliary pressure vessel 14 is communicated with principal pressure container 1 by a pipeline 17, and is provided with the first valve 18 and differential pressure pick-up to be calibrated 19 on a pipeline 17.
Adopt this device to carry out the method for pressure fluctuation calibration to differential pressure pick-up, carry out as follows during operation:
A, be arranged on differential pressure pick-up 19 to be calibrated between first valve 18 and auxiliary pressure vessel 14 a pipeline 17 on, then open the first valve 18 and the second valve 16;
B, startup control motor 11, and drive leading screw 10 to rotate by reductor 12, shaft coupling 13, leading screw 10 drives piston rod 9 descending, and piston moves down, and makes standard pressure transducer 2 reach reference pressure, closing control motor 11;
C, close the second valve 16, again start and control motor 11, leading screw 10 driven plunger moves down, according to the range of differential pressure pick-up 19 to be calibrated, select some different spot pressures be distributed in range pressure, mobile piston, from reference pressure value, until standard pressure transducer display pressure reach the range pressure of reference pressure and differential pressure pick-up to be calibrated and time, write down the shift value on the force value of different pressures point and the displacement transducer of correspondence thereof respectively;
D, be horizontal ordinate with shift value, take force value as ordinate, in rectangular coordinate system, mark the shift value of displacement transducer display and the force value of respective standard pressure transducer display and corresponding to difference one group of coordinate points of reference pressure, use this group coordinate points of curve again, under reference pressure, set up piston displacement and principal pressure container pressure change between relation;
E, the pressure surge under regulation differential pressure will measured according to differential pressure pick-up to be calibrated, the first step, mobile piston, makes the numerical value that standard pressure transducer shows reach regulation reference pressure value; Second step, according to the relation between the pressure change of the piston displacement of having set up and principal pressure container, the shift value of piston is obtained by the size of pressure surge, trace mobile piston, just required slight pressure fluctuation can be produced, obtain the slight pressure fluctuation that standard pressure transducer cannot be measured, realize the demarcation to the pressure surge of differential pressure pick-up to be calibrated under authorised pressure.
When fluid property is determined, after adopting the relation curve between high-precision standard pressure transducer build-up pressure and piston displacement, can without standard pressure transducer 2 in using later.This device also can directly as the pressure calibration of the pressure transducer of low precision and the differential pressure calibration of low low precision pressure sensor.
Auxiliary pressure vessel 14 also can be pipeline.

Claims (2)

1. the pressure fluctuation calibration device of differential pressure pick-up, is characterized in that comprising:
Principal pressure container (1) and the standard pressure transducer (2) be connected on described principal pressure container;
Frame and the cylinder body (4) be installed in described frame, the intracavity bottom of described cylinder body (4) is communicated with described principal pressure container (1) by No. two pipelines (5);
The top of described cylinder body (4) is provided with piston, and the top exterior walls of piston rod (9) has been fixedly arranged on guide flange (6), and described guide flange (6) for guide rail, and is provided with displacement transducer (8) with the column of described frame (7) between guide flange and guide rail;
The top of described frame is provided with the gear train driving described piston rod (9) to run up and down;
Auxiliary pressure vessel (14) is set, is communicated with and forms threeway No. three pipelines (15) of auxiliary pressure vessel (14) bottom with the inner chamber of described No. two pipelines (5) and described cylinder body, described No. three pipelines (15) are provided with the second valve (16);
The top of described auxiliary pressure vessel (14) is communicated with described principal pressure container (1) by a pipeline (17), and is provided with the first valve (18) and differential pressure pick-up to be calibrated (19) on a described pipeline (17).
2. the pressure fluctuation calibration device of differential pressure pick-up according to claim 1, it is characterized in that, the epimere hollow of described piston rod (9) is also provided with internal thread, described gear train comprises: be provided with the leading screw (10) mated with described internal thread on the top of described frame, the top of frame is also provided with and controls motor (11), reductor (12) and shaft coupling (13), and top and the described shaft coupling (13) of described leading screw (10) connect firmly.
CN201310291402.7A 2011-12-23 2011-12-23 Pressure fluctuation calibration device of differential pressure sensor Active CN103344384B (en)

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Related Parent Applications (1)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2335136Y (en) * 1998-03-24 1999-08-25 国营二一○厂 Pressure generator for pressure calibrating
CN201852675U (en) * 2010-08-27 2011-06-01 李宝新 Calibration device for pressure gauge
CN201974271U (en) * 2011-01-20 2011-09-14 淮阴工学院 Calibration device for hydraulic sensor of engineering vehicle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6813925B2 (en) * 2002-06-05 2004-11-09 General Electric Company Calibration method and system for a dynamic combustor sensor
US7467555B2 (en) * 2006-07-10 2008-12-23 Rosemount Inc. Pressure transmitter with multiple reference pressure sensors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2335136Y (en) * 1998-03-24 1999-08-25 国营二一○厂 Pressure generator for pressure calibrating
CN201852675U (en) * 2010-08-27 2011-06-01 李宝新 Calibration device for pressure gauge
CN201974271U (en) * 2011-01-20 2011-09-14 淮阴工学院 Calibration device for hydraulic sensor of engineering vehicle

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