CN110361134A - A kind of modification method of tilting micromanometer deviation - Google Patents
A kind of modification method of tilting micromanometer deviation Download PDFInfo
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- CN110361134A CN110361134A CN201910653266.9A CN201910653266A CN110361134A CN 110361134 A CN110361134 A CN 110361134A CN 201910653266 A CN201910653266 A CN 201910653266A CN 110361134 A CN110361134 A CN 110361134A
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- pressure
- micromanometer
- differential manometer
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- deviation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
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Abstract
The present invention relates to pressure gauge technical fields.The present invention is a kind of modification method of tilting micromanometer deviation, by considering working fluid density, atmospheric density, the inflection point of the tilt angle of inclined tube micromanometer and curved tube differential manometer, solving the problems, such as that measurement accuracy is impacted compared with pressure standard meter.
Description
Technical field
The present invention relates to pressure gauge technical field more particularly to a kind of modification methods of tilting micromanometer deviation.
Background technique
Tilting micromanometer is that a kind of instrument of pressure is measured using the difference in height of fluid column based on hydrostatic principle
Device is mainly used for the measurement of gauge pressure and differential pressure, by textural classification, can be divided into inclined tube micromanometer and curved tube differential manometer, inclined tube minute-pressure
The design feature of meter is that measurement pipe is the inclined tube angled with horizontal plane, can be by lesser liquid-column height difference by a certain percentage
Amplification, improves the resolving power of measurement；The design feature of curved tube differential manometer is that measurement pipe is designed to the rectilinear combination of inclination-curve-
Structure can equally improve the resolving power of slight pressure measurement.The design feature of tilting micromanometer can measure the micro- of gas
Small pressure, but also make the pressure measurement of tilting micromanometer there are deviation, the density, atmospheric density, inclined tube such as working fluid are micro-
Press the tilt angle of meter and the inflection point of curved tube differential manometer, it is therefore desirable to which a kind of modification method for tilting micromanometer improves
Measurement accuracy.
Summary of the invention
(1) technical problems to be solved
Based on the above issues, the present invention provides a kind of modification method of tilting micromanometer deviation, improves tilting minute-pressure
The measurement accuracy of meter.
(2) technical solution
Based on above-mentioned technical problem, the present invention provides a kind of modification method of tilting micromanometer deviation, and feature exists
In the modification method comprises the steps of:
S1,2 hours are stood, the level of differential manometer is adjusted, level(l)ing bubble is made to be in center, inject working solution
Then body excludes the intracorporal air of liquid using the method being pressurized repeatedly, until the zero-bit of differential manometer is stablized；
S2, the both ends of three-way connection are respectively connected to pressure standard meter with rubber hose for medical and the positive pressure of differential manometer need to be corrected
It connects mouth or negative pressure connects on mouth, while the other end of three-way connection rubber hose for medical is connected into pressure regulator；
The selection of S3, pressure detecting point:
When tilting micromanometer is inclined tube micromanometer: uniformly being chosen in scale range, 0.5 grade of inclined tube micromanometer takes 5
A, 1.0 grades and following level inclined tube micromanometer take 3 points；
When tilting micromanometer is curved tube differential manometer: being nearby pressure detecting point, test point to indicate the groove of number
Comprising zero point and inflection point, quantity is no less than 6 points, and is distributed in gamut scope；
When S4, detection, pressure is made with pressure regulator, each pressure detecting point is slowly smoothly gradually pressurized to by zero point, until surveying
The upper limit is measured, it is after pressure stabilisation in each test point, the show value of pressure standard meter and differential manometer is read by accuracy of reading respectively；
Then decompression is slowly smoothly carried out with same method and detect each pressure detecting point, until returning to zero point；
The display deviation calculating of S5, each pressure detecting point:
The display deviation of S5.1,0.5 grade of inclined tube micromanometer, each pressure detecting point are calculated as follows:
In formula, △ p is the display deviation of differential manometer, and ρ is the working fluid density of differential manometer, ρaFor atmospheric density, ρ0It is micro-
The working fluid density marked on pressure meter nameplate, g are local acceleration of gravity, p0For the pressure show value of pressure standard meter, l
For the show value of inclined tube micromanometer scale on a certain inclination constant, K is the inclination constant of inclined tube micromanometer；
The relative deviation of each pressure detecting point is calculated as follows:
In formula, δ is the relative deviation of differential manometer, and L is the measurement upper limit fluid column that inclined tube micromanometer is tested on the inclination constant
Height value；
The inclined tube micromanometer of S5.2,1.0 grades and following level, the display deviation of each pressure detecting point are calculated as follows:
The relative deviation of each pressure detecting point is calculated as follows:
The display deviation of S5.3, curved tube differential manometer, each pressure detecting point are calculated as follows:
Δ p=p-p0
When examining and determine point pressure less than or equal to inflection point pressure, the relative deviation of each pressure detecting point is calculated as follows:
In formula, pbFor the inflection point pressure of curved tube differential manometer；
When examining and determine point pressure greater than inflection point pressure, the relative deviation of each pressure detecting point is calculated as follows:
In formula, pmaxFor the measurement upper limit of curved tube differential manometer.
Further, accuracy of reading described in step S4 are as follows: for 0.5 grade of inclined tube micromanometer, reading should read indexing
The 1/5 of value, for 1.0 grades and following level inclined tube micromanometer, reading should read the 1/2 of scale division value, for curved tube differential manometer, read
Number, which should be estimated, reads the 1/5 of scale division value.
Preferably, the pressure standard meter be standard compensation formula differential manometer, the maximum allowable offset of pressure standard meter it is exhausted
It should be no more than the 1/3 of the maximum allowable offset absolute value that need to correct differential manometer to value.
Further, the maximum allowable offset is the class of accuracy of differential manometer multiplied by ± 1%.
(3) beneficial effect
Above-mentioned technical proposal of the invention has the advantages that
(1) this method considers respectively for the design feature of differential manometer, accuracy requirement: inclined tube micromanometer considers
The influence of the density variation of working fluid and the tilt angle of inclined tube micromanometer to measurement accuracy, 0.5 grade of inclined tube micromanometer is also
Consider deviation caused by atmospheric density, and the inclined tube micromanometer of 1.0 grades and following level can be ignored caused by atmospheric density
Deviation, curved tube differential manometer consider influence of the resolving power difference to measurement accuracy before and after inflection point；The modification method specific aim is clear,
Practicability is stronger, and accuracy is higher；
(2) preparation before differential manometer amendment, such as stands 2 hours, level(l)ing bubble is made to be in center, exclude working fluid
Interior control stablizes the zero-bit of differential manometer, keeps correction result more acurrate；
(3) structure of connection method used in this method is simple, easy to operate, it is easy to make pressure or be depressured to each pressure detecting
Point；
(4) pressure detecting point is chosen according to the accuracy of differential manometer and design feature, keeps pressure detecting point more representative,
And meet the accuracy rating of differential manometer.
Detailed description of the invention
The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, and attached drawing is schematically without that should manage
Solution is carries out any restrictions to the present invention, in the accompanying drawings:
Fig. 1 is the modified flow chart of tilting micromanometer of the embodiment of the present invention；
Fig. 2 is the modified connection schematic diagram of tilting micromanometer of the embodiment of the present invention；
In figure: 1: pressure standard meter；2: rubber hose for medical；3: three-way connection；4: differential manometer need to be corrected；5: pressure regulator.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
The present invention be a kind of tilting micromanometer deviation modification method, which is characterized in that the modification method include with
Lower step:
S1,2 hours are stood, the level of differential manometer is adjusted, level(l)ing bubble is made to be in center, inject working solution
Then body excludes the intracorporal air of liquid using the method being pressurized repeatedly, until the zero-bit of differential manometer is stablized；Inclined tube micromanometer
Working fluid to be generally density be 810kg/m3Ethyl alcohol, it is 826kg/m that the working fluid of curved tube differential manometer, which is generally density,3
Kerosene or miscella.
S2, as shown in Figure 1, the both ends rubber hose for medical 2 of three-way connection 3 is respectively connected to pressure standard meter 1 and need to be repaired
The positive crimping mouth or negative pressure of positive differential manometer 4 connect on mouth, while the other end of three-way connection 3 rubber hose for medical 2 is connected pressure regulator
5；The pressure standard meter 1 is standard compensation formula differential manometer, and the absolute value of the maximum allowable offset of pressure standard meter 1 should be not more than
The 1/3 of the maximum allowable offset absolute value of differential manometer 4 need to be corrected.
The selection of S3, pressure detecting point:
When tilting micromanometer is inclined tube micromanometer: uniformly being chosen in scale range, 0.5 grade of inclined tube micromanometer takes 5
A, 1.0 grades and following level inclined tube micromanometer take 3 points；
When tilting micromanometer is curved tube differential manometer: being nearby pressure detecting point, test point to indicate the groove of number
Comprising zero point and inflection point, quantity is no less than 6 points, and is distributed in gamut scope.
When S4, detection, pressure is made with pressure regulator 5, each pressure detecting point is slowly smoothly gradually pressurized to by zero point, until surveying
The upper limit is measured, it is after pressure stabilisation in each test point, the display of pressure standard meter 1 and differential manometer is read by accuracy of reading respectively
Value；Then decompression is slowly smoothly carried out with same method and detect each pressure detecting point, until returning to zero point；For 0.5
Grade inclined tube micromanometer, reading should read the 1/5 of scale division value, and for 1.0 grades and following level inclined tube micromanometer, reading should be read point
The 1/2 of angle value, for curved tube differential manometer, reading, which should be estimated, reads the 1/5 of scale division value；
The inclined tube micromanometer of range-adjustable should be carried out in the angle of corresponding each inclination constant when detection, and every change
Zero-bit need to be readjusted by changing an angle；For indicating the differential manometer of positive/negative-pressure value, negative pressure range can only examine maximum pressure
Point.
The display deviation calculating of S5, each pressure detecting point:
The display deviation of S5.1,0.5 grade of inclined tube micromanometer, each pressure detecting point are calculated as follows:
In formula, △ p is the display deviation of differential manometer, and ρ is the working fluid density of differential manometer, ρaFor atmospheric density, ρ0It is micro-
The working fluid density marked on pressure meter nameplate, g are local acceleration of gravity, p0For the pressure show value of pressure standard meter, l
For the show value of inclined tube micromanometer scale on a certain inclination constant, K is the inclination constant of inclined tube micromanometer；
The relative deviation of each pressure detecting point is calculated as follows:
In formula, δ is the relative deviation of differential manometer, and L is the measurement upper limit fluid column that inclined tube micromanometer is tested on the inclination constant
Height value；
The inclined tube micromanometer of S5.2,1.0 grades and following level, the display deviation of each pressure detecting point are calculated as follows:
The relative deviation of each pressure detecting point is calculated as follows:
The display deviation of S5.3, curved tube differential manometer, each pressure detecting point are calculated as follows:
Δ p=p-p0
When examining and determine point pressure less than or equal to inflection point pressure, the relative deviation of each pressure detecting point is calculated as follows:
In formula, pbFor the inflection point pressure of curved tube differential manometer；
When examining and determine point pressure greater than inflection point pressure, the relative deviation of each pressure detecting point is calculated as follows:
In formula, pmaxFor the measurement upper limit of curved tube differential manometer.
Zero-bit should be detected after detection again, when being more than the 1/4 of maximum allowable offset absolute value such as zero-bit variation, need to be adjusted again
Whole zero-bit, and step S1 to S5 is carried out again；The maximum allowable offset is the class of accuracy of differential manometer multiplied by ± 1%.
The modification method of above-mentioned tilting micromanometer is equally applicable to the amendment of compensate-type micropressure meter.
In summary, the modification method of above-mentioned a kind of tilting micromanometer deviation, has the advantage that
(1) this method considers respectively for the design feature of differential manometer, accuracy requirement: inclined tube micromanometer considers
The influence of the density variation of working fluid and the tilt angle of inclined tube micromanometer to measurement accuracy, 0.5 grade of inclined tube micromanometer is also
Consider deviation caused by atmospheric density, and the inclined tube micromanometer of 1.0 grades and following level can be ignored caused by atmospheric density
Deviation, curved tube differential manometer consider influence of the resolving power difference to measurement accuracy before and after inflection point；The modification method specific aim is clear,
Practicability is stronger, and accuracy is higher；
(2) preparation before differential manometer amendment, such as stands 2 hours, level(l)ing bubble is made to be in center, exclude working fluid
Interior control stablizes the zero-bit of differential manometer, keeps correction result more acurrate；
(3) structure of connection method used in this method is simple, easy to operate, it is easy to make pressure or be depressured to each pressure detecting
Point；
(4) pressure detecting point is chosen according to the accuracy of differential manometer and design feature, keeps pressure detecting point more representative,
And meet the accuracy rating of differential manometer.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Embodiments of the present invention are described in conjunction with the accompanying, but those skilled in the art can not depart from spirit and model of the invention
Various modifications and variations are made in the case where enclosing, such modifications and variations each fall within the range being defined by the appended claims
Within.
Claims (4)
1. a kind of modification method of tilting micromanometer deviation, which is characterized in that the modification method comprises the steps of:
S1,2 hours are stood, the level of differential manometer are adjusted, level(l)ing bubble is made to be in center, inject working fluid,
Then the intracorporal air of liquid is excluded using the method being pressurized repeatedly, until the zero-bit of differential manometer is stablized；
S2, the both ends of three-way connection are respectively connected to pressure standard meter with rubber hose for medical and the positive crimping mouth of differential manometer need to be corrected
Or negative pressure connects on mouth, while the other end of three-way connection rubber hose for medical is connected pressure regulator；
The selection of S3, pressure detecting point:
When tilting micromanometer is inclined tube micromanometer: it is uniformly chosen in scale range, 0.5 grade of inclined tube micromanometer takes 5 points,
1.0 grades and following level inclined tube micromanometer take 3 points；
When tilting micromanometer is curved tube differential manometer: being nearby pressure detecting point to indicate the groove of number, test point includes
Zero point and inflection point, quantity is no less than 6 points, and is distributed in gamut scope；
When S4, detection, pressure is made with pressure regulator, each pressure detecting point is slowly smoothly gradually pressurized to by zero point, until in measurement
Limit, it is after pressure stabilisation in each test point, the show value of pressure standard meter and differential manometer is read by accuracy of reading respectively；Then
Decompression is slowly smoothly carried out with same method and detects each pressure detecting point, until returning to zero point；
The display deviation calculating of S5, each pressure detecting point:
The display deviation of S5.1,0.5 grade of inclined tube micromanometer, each pressure detecting point are calculated as follows:
In formula, △ p is the display deviation of differential manometer, and ρ is the working fluid density of differential manometer, ρaFor atmospheric density, ρ0For differential manometer
The working fluid density marked on nameplate, g are local acceleration of gravity, p0For the pressure show value of pressure standard meter, l is oblique
The show value of pipe differential manometer scale on a certain inclination constant, K is the inclination constant of inclined tube micromanometer；
The relative deviation of each pressure detecting point is calculated as follows:
In formula, δ is the relative deviation of differential manometer, and L is the measurement upper limit liquid-column height that inclined tube micromanometer is tested on the inclination constant
Value；
The inclined tube micromanometer of S5.2,1.0 grades and following level, the display deviation of each pressure detecting point are calculated as follows:
The relative deviation of each pressure detecting point is calculated as follows:
The display deviation of S5.3, curved tube differential manometer, each pressure detecting point are calculated as follows:
Δ p=p-p0
When examining and determine point pressure less than or equal to inflection point pressure, the relative deviation of each pressure detecting point is calculated as follows:
In formula, pbFor the inflection point pressure of curved tube differential manometer；
When examining and determine point pressure greater than inflection point pressure, the relative deviation of each pressure detecting point is calculated as follows:
In formula, pmaxFor the measurement upper limit of curved tube differential manometer.
2. a kind of modification method of tilting micromanometer deviation according to claim 1, which is characterized in that institute in step S4
The accuracy of reading stated are as follows: for 0.5 grade of inclined tube micromanometer, reading should read the 1/5 of scale division value, for 1.0 grades and following level
Inclined tube micromanometer, reading should read the 1/2 of scale division value, and for curved tube differential manometer, reading, which should be estimated, reads the 1/5 of scale division value.
3. a kind of modification method of tilting micromanometer deviation according to claim 1, which is characterized in that the pressure mark
Quasi- device is standard compensation formula differential manometer, and the absolute value of the maximum allowable offset of pressure standard meter, which should be not more than, need to correct differential manometer
The 1/3 of maximum allowable offset absolute value.
4. a kind of modification method of tilting micromanometer deviation according to claim 3, which is characterized in that described maximum fair
Perhaps deviation is the class of accuracy of differential manometer multiplied by ± 1%.
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| JP4843152B2 (en) * | 2001-04-19 | 2011-12-21 | 株式会社ミツトヨ | Pressure test apparatus and pressure test method |
| CN202471350U (en) * | 2012-01-18 | 2012-10-03 | 国电大渡河瀑布沟发电有限公司 | Three-way pressure checking apparatus |
| CN203824702U (en) * | 2014-04-24 | 2014-09-10 | 株洲南方燃气轮机成套制造安装有限公司 | Calibration device for pressure transmitter |
| CN205506293U (en) * | 2016-02-05 | 2016-08-24 | 北京汽车股份有限公司 | Pressure sensor calibration device |
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2019
- 2019-07-19 CN CN201910653266.9A patent/CN110361134A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4843152B2 (en) * | 2001-04-19 | 2011-12-21 | 株式会社ミツトヨ | Pressure test apparatus and pressure test method |
| CN101672714A (en) * | 2009-09-25 | 2010-03-17 | 中国北车集团大连机车车辆有限公司 | Accurate calibration micro-pressure detecting method |
| CN202471350U (en) * | 2012-01-18 | 2012-10-03 | 国电大渡河瀑布沟发电有限公司 | Three-way pressure checking apparatus |
| CN203824702U (en) * | 2014-04-24 | 2014-09-10 | 株洲南方燃气轮机成套制造安装有限公司 | Calibration device for pressure transmitter |
| CN205506293U (en) * | 2016-02-05 | 2016-08-24 | 北京汽车股份有限公司 | Pressure sensor calibration device |
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