CN105466631B - A kind of calibration method and calibrating installation of piston gage piston effective area - Google Patents
A kind of calibration method and calibrating installation of piston gage piston effective area Download PDFInfo
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Abstract
The invention discloses a kind of calibration method of piston gage piston effective area, including step S1：The swing weight-adding on standard piston records the increment of the counterbalance mass of plus-minus, accordingly obtains the increment △ P that standard piston reaches pressure suffered during balance；Step S2：The swing weight-adding on fixed piston to be checked, the increment for making counterbalance mass of the increment for the counterbalance mass added and subtracted in fixed piston to be checked with being added and subtracted on standard piston are equal；Obtain the increment △ P' that fixed piston to be checked reaches pressure suffered during balance；Step S3：The effective area for obtaining fixed piston to be checked is calculated according to formula.The counterweight that the present invention passes through the plus-minus equal increments on standard piston and fixed piston to be checked, and then obtain the increment of the pressure of corresponding standard piston and fixed piston to be checked, so as to obtain the effective area of piston gage piston, do not need to add and subtract miniweights repeatedly, greatly improve working efficiency.The present invention also provides a kind of calibrating installations of piston gage piston effective area.
Description
Technical field
The present invention relates to measurement verification field more particularly to a kind of calibration methods of piston gage piston effective area
And calibrating installation.
Background technology
Standard metrology appliance of the piston gage as pressure measurement transmission of quantity value has class of accuracy height, stablizes
The advantages that property is good, measurement range is wide.Based on above-mentioned advantage, legal metering validation activity is generally all using piston gage as society
The public measurement criteria of meeting carries out legal transmission of quantity value work in administrative range；And general enterprises and institutions can also select
Maximum pressure measurement criteria of the piston gage as our unit carries out transmission of quantity value work in our unit.According to metering
The requirement of method, the piston gage standard of both the above property belong to the measurement instrument of compulsory verification, so, piston type
Pressure gauge magnitude it is accurate and effective trace to the source it is particularly significant.
According to the requirement of State Administration of Quality Supervision, Inspection and Quarantine, the magnitude tracing mode of piston gage is needed according to national metrological verification regulations
JJG59-2007 is examined and determine；The regulation is based on R1101994 (E)《Piston manometer》International recommendation is formulated, by piston-type pressure
Committed step of the calibrating of the effective area of meter as magnitude tracing.At present, existing piston effective area calibration method is usual
Using direct balanced method or starting balancing method.Both methods essence is identical, be all by fixed piston to be checked and standard piston simultaneously
It loads or is connected in same verification system by pipeline, the swing weight-adding on fixed piston to be checked and standard piston, makes respectively
The pressure (strong) being subject on fixed piston and standard piston to be checked is equal to reach dynamic equilibrium, obtains and is placed under dynamic balance state
Counterbalance mass on fixed piston to be checked and standard piston, it is known that the effective area (tracing to the source to higher standard) of standard piston；
The piston effective area for obtaining fixed piston formula pressure gauge to be checked is finally calculated according to formula.
Formula principle using direct balanced method or starting balancing method calibrating piston gage piston effective area is as follows：
The fundamental formular of piston gage piston effective area calibrating is as follows：
Wherein, A：The effective area of piston gage；m：Counterbalance mass during balance；g：Acceleration of gravity；P：During balance
The pressure being applied on piston gage；
Since the pressure applied on fixed piston to be checked and standard piston is equal, i.e. P=P'；Therefore when fixed piston to be checked and
When standard piston reaches dynamic balance state, it is as follows to can obtain formula：
It further derives, the effective area formula that can obtain the piston of fixed piston formula pressure gauge to be checked is as follows：
Wherein, A, A'：Represent the effective area of standard piston and fixed piston to be checked；M, m'：When expression reaches dynamic equilibrium,
The counterbalance mass being added in respectively on standard piston and fixed piston to be checked；P, P'：When expression reaches dynamic equilibrium, standard piston and treat
The pressure that calibrating piston is respectively subjected to.
Finally, by obtaining, added counterbalance mass and standard are lived on standard piston and fixed piston to be checked under dynamic balance state
The effective area of plug can calculate the effective area for obtaining fixed piston formula pressure gauge to be checked further according to above-mentioned formula.
But when being examined and determine using direct balanced method or starting balancing method piston gage piston effective area, operation
Difficulty is big, and to the more demanding of testing person.Because during using direct balanced method or starting balancing method calibrating, examining and determine
Most important step is that standard piston and fixed piston to be checked is made to reach dynamic equilibrium in journey, even if P=P', and piston gage
Sensitivity it is very high, to reach dynamic equilibrium needs repeatedly plus-minus miniweights, and need to adjust repeatedly, time-consuming and laborious, work effect
Rate is not high；And during this swing weight-adding, standard piston and fixed piston to be checked will also keep the position respectively to work,
It is rotated with the speed of (30-60) r/min, this just considerably increases the difficulty of operation.In addition, and more highly important, work
Plug may decline with certain speed when reaching dynamic equilibrium, this needs verification worker empirically to be judged with knowledge, slightly
There is carelessness to be possible to cause result of calculation and actually have relatively large deviation.
Invention content
The invention reside in the shortcomings that overcoming the prior art with it is insufficient, provide one kind do not need to plus-minus miniweights, it is simple and practical,
It improves working efficiency, can realize the method examined and determine piston gage piston effective area.
The present invention is achieved by the following technical solutions：A kind of calibrating side of piston gage piston effective area
Method includes the following steps：
Step S1：The swing weight-adding on standard piston records the increment of the counterbalance mass of plus-minus, accordingly obtains standard and lives
Plug reaches the increment △ P of pressure suffered during balance；
Step S2：The swing weight-adding on fixed piston to be checked makes the increment and mark of the counterbalance mass added and subtracted in fixed piston to be checked
The increment for the counterbalance mass added and subtracted on quasi- piston is equal；Obtain the increment △ that fixed piston to be checked reaches pressure suffered during balance
P'；
Step S3：The effective area A of standard piston is obtained, and the significant surface for obtaining fixed piston to be checked is calculated according to formula
Product；Formula is as follows：
In above-mentioned formula, △ P, △ P'：The increment of standard piston and the pressure suffered by fixed piston to be checked is represented respectively；A,
A'：The effective area of standard piston and fixed piston to be checked is represented respectively.
Compared with the prior art, the calibration method of piston gage piston effective area proposed by the present invention, by
The counterweight of phase homogenous quantities is added and subtracted on standard piston and fixed piston to be checked, makes the counterweight being placed on standard piston and fixed piston to be checked
Increment it is identical, and then need to only obtain the increment of the pressure of accordingly standard piston and fixed piston to be checked, so that it may obtain piston type
Manometer piston effective area, do not need to judge two-piston whether and meanwhile reach dynamic equilibrium, it is not required that plus-minus miniweights makes
Common staff can be completed to piston be pressure meter effective area calibrating, it is simple and practical, substantially increase work effect
Rate.
Further, in step sl, the standard piston is loaded on a piston-type pressure meter systems, which uses
Make pressure medium be liquid or gas；One presser unit is set on piston-type pressure meter systems, by presser unit to work
Plug manometer systems pressurize, and standard piston are made to reach balance and every time in same operating position, with (30~60) r/
Clockwise direction's rotation of min.
Further, in step s 2, the fixed piston to be checked is loaded on the piston-type pressure meter systems, the system
The pressure medium of making used is liquid or gas；The weight equal with counterweight increment on standard piston is added and subtracted on fixed piston to be checked
Code, pressurizes to piston-type pressure meter systems by presser unit, and fixed piston to be checked is made to reach balance and every time same
Operating position is rotated with the clockwise direction of (30~60) r/min.
Further, in step S1 and S2, pressure size to be examined and determine as needed, successively in standard piston and to be checked
Swing weight-adding on fixed piston, record is the adjacent increment of counterbalance mass examined and determine and added and subtracted between pressure spot, and acquisition is that standard is lived
Increment △ P and the △ P' of plug and the fixed piston to be checked pressure suffered between adjacent calibrating pressure spot when reaching balance.
Further, a digital pressure gauge is loaded on piston-type pressure meter systems；Pass through digital pressure gauge measurement standard
Piston and piston to be measured reach pressure suffered during balance, and calculate the increment △ P for the pressure for obtaining standard piston respectively and treat
Survey the increment △ P' of piston pressure.
The present invention also provides a kind of calibrating installation of piston gage piston effective area, including standard piston, number
Pressure gauge, presser unit, piston-type pressure meter systems and several counterweights；The standard piston and fixed piston to be checked are loaded in work
On plug manometer systems；The counterweight is placed on the standard piston or fixed piston to be checked；The presser unit is to described
Piston-type pressure meter systems pressurize；The digital pressure gauge is loaded on the piston-type pressure meter systems, is lived with measurement standard
Pressure suffered by plug or fixed piston to be checked.
Further, a data acquisition process unit is further included；The digital collection processing unit and the digital pressure
Meter connects and receives the pressure signal of the digital pressure gauge transmission.
Further, the sensor in the digital pressure gauge is quartz resonance pressure sensor.
Compared with the prior art, the present invention is same by the way that standard piston, fixed piston to be checked and digital pressure gauge are loaded in
On piston-type pressure meter systems, and on standard piston and fixed piston to be checked add and subtract phase homogenous quantities counterweight, make to be placed on standard
Piston is identical with the increment of the counterweight on fixed piston to be checked, so only need to by digital pressure gauge obtain accordingly standard piston and
The increment of the pressure of fixed piston to be checked, so that it may obtain piston gage piston effective area, not need to whether judge two-piston
Reach balance simultaneously, it is not required that plus-minus miniweights so that it is pressure gauge significant surface that common staff, which can be completed to piston,
Long-pending calibrating, it is simple and practical, it greatly improves work efficiency.
In order to better understand and implement, the invention will now be described in detail with reference to the accompanying drawings.
Description of the drawings
Fig. 1 is the structure diagram of the calibrating installation of inventive piston formula manometer piston effective area.
Specific embodiment
Referring to Fig. 1, it is the structure diagram of the calibrating installation of inventive piston formula manometer piston effective area.It should
The calibrating installation of piston gage piston effective area, including standard piston 1, piston-type pressure meter systems 2, prepressing units 3,
Presser unit 4, several counterweights 5, digital pressure gauge 6 and data acquisition process unit 7.
The standard piston 1 and fixed piston to be checked 8 are loaded on the piston-type pressure meter systems 2.The prepressing units 3
It pressurizes with presser unit 4 to the piston-type pressure meter systems 2, to press to the standard piston 1 or fixed piston to be checked 8.Institute
It states counterweight 5 to be placed on the standard piston 1 or fixed piston to be checked 8, so that the standard piston 1 or fixed piston to be checked 8 are in
Operating position simultaneously keeps certain clockwise direction to rotate, and then the standard piston 1 or fixed piston to be checked 8 is made to reach balance.
The digital pressure gauge 6 is loaded on the piston-type pressure meter systems 2, and by the standard piston 1 of measurement or fixed piston to be checked 8
Suffered pressure signal is transmitted to the digital collection processing unit 7.
The piston-type pressure meter systems 2 be equipped with respectively with the standard piston 1, fixed piston to be checked 8, digital pressure gauge
6th, prepressing units 3 are connected with presser unit 4 standard piston valve 21, fixed piston valve 22 to be checked, digital pressure gauge valve 23,
Prepressing units valve 24 and presser unit valve 25.
In the present embodiment, the sensor in the digital pressure gauge 6 is quartz resonance pressure sensor.Quartz resonance pressure
Sensor has excellent year stability and the high linearity and repeatability, the error especially in certain measurement range
It is small, accuracy of reading can be realized, comparable to the piston gage of same precision.
In the present invention, the pressure medium of making used in the piston-type pressure meter systems is liquid or gas, is corresponded to respectively
In the gentle body piston-type pressure meter systems of piston-type pressure meter systems, the two systems are referred to as piston gage by the present invention
System.
The calibrating installation of the piston gage piston effective area of the present invention, fixed piston 8 and standard piston 1 to be checked can be with
It need not be mounted on piston-type pressure meter systems 2 simultaneously, because independently being examined and determine during the calibrating of fixed piston to be checked 8 and standard piston 1
, it is only necessary to ensure to load identical with the increment of the quality of the counterweight on standard piston 1 in fixed piston 8 to be checked.
The basic principle of present invention calibrating piston gage piston effective area is first introduced below：
The fundamental formular examined and determine according to piston gage piston effective areaIt is found that when being added and subtracted on piston
5 increment of counterweight when changing, the increment for the pressure being correspondingly applied on piston also can proportionally change.Cause
This, the fundamental formular of piston gage piston effective area can be exchanged into：
That is, add and subtract (the same set of counterweight of counterweight 5 of phase homogenous quantities respectively on standard piston 1 and fixed piston to be checked 8
5) it is identical with the increment of the counterweight on fixed piston 8 to be checked, to make to be placed on standard piston 1, by obtaining accordingly 1 He of standard piston
The increment of the pressure of fixed piston 8 to be checked, so that it may obtain piston gage piston effective area, i.e. above-mentioned formula can be further
It is derived by equation below：
And then the calculation formula that can obtain piston gage piston effective area is as follows：
In above-mentioned formula, △ P, △ P'：Before and after representing swing weight-adding 5, the increasing of 8 pressure of standard piston 1 and fixed piston to be checked
Amount；A, A'：Represent the effective area of standard piston 1 and fixed piston to be checked 8.
The calibration method of present invention calibrating piston gage piston effective area is described below, is as follows：
Step S1：The swing weight-adding 5 on standard piston 1 records the increment of 5 mass of counterweight of plus-minus, is accordingly marked
Quasi- piston 1 reaches the increment △ P of pressure suffered during balance；
Specifically, standard piston 1, digital pressure gauge 6 and fixed piston to be checked 8 are loaded in a piston-type pressure meter systems 2
On, a prepressing units 3 and presser unit 4 are set on piston-type pressure meter systems 2；A data are connected on digital pressure gauge 6
Acquisition process unit 7.
Standard piston valve 21, digital pressure gauge valve 23, prepressing units valve 24 and presser unit valve 25 are opened, is closed
Close fixed piston valve 22 to be checked.When examining and determine first pressure spot, added in and first tested level pressure on standard piston 1
The counterweight 5 of the corresponding quality in force by prepressing units 3 first to 2 manual pressure of piston-type pressure meter systems, treats that feel is lived
When having certain pressure in plug manometer systems 2, pressurizeed with presser unit 4, piston is made to rise to operating position.It rotates simultaneously
Counterweight 5 is made standard piston 1 reach balance and be rotated with the clockwise direction of (30-60) r/min, passes through data acquisition process list
Member 7 obtains the pressure suffered by standard piston 1 at this time, and record is added in the quality of the counterweight 5 on standard piston 1 at this time.Treat first
After the completion of examining and determine pressure spot calibrating, placed on piston with second accredited corresponding counterweight of pressure spot, repeat calibrating the
The step of one calibrating point, piston is made to reach same operating position；Simultaneously rotate counterweight 5, make standard piston 1 reach balance and with
Clockwise direction's rotation of (30-60) r/min, is obtained by data acquisition process unit 7 suffered by 1 pressure gauge of standard piston at this time
Pressure, record is added in 5 mass of counterweight on standard piston 1 at this time；And then it obtains standard piston 1 and examines and determine pressure spot at first
With the pressure increment △ P suffered by second calibrating pressure spot, calculate standard piston 1 and pressure spot and second inspection are examined and determine at first
The mass incremental △ m of counterweight 5 that level pressure force is placed when examining and determine.And so on, other constant-pressure points to be checked are surveyed respectively
Amount and record.
Step S2：According to the method for step S1, the swing weight-adding 5 on fixed piston 8 to be checked makes to add and subtract in fixed piston 8 to be checked
Counterbalance mass increment it is equal with the increment of counterbalance mass added and subtracted on standard piston 1；It obtains fixed piston 8 to be checked and reaches balance
When suffered pressure increment △ P'；Ensure that the order of addition of counterweight is identical with step S1, because of different counterweight matter
Amount might have difference.
Specifically, standard of closure piston valve 21, fixed piston valve 22 to be checked, digital pressure gauge valve 23, precompressed are opened
Unit valve 24 and presser unit valve 25.First accredited pressure spot with standard piston 1 is added on fixed piston 8 to be checked
The counterweight 5 of corresponding quality by prepressing units 3 first to 2 manual pressure of piston-type pressure meter systems, treats feel by piston type
When having certain pressure in manometer systems 2, pressurizeed with presser unit 4, piston is made to rise to operating position.Make standard piston 1
Reach balance and rotated with the clockwise direction of (30-60) r/min, obtaining standard at this time by data acquisition process unit 7 lives
Pressure suffered by plug 1, record are added in the quality of the counterweight 5 on standard piston 1 at this time.Treat that first calibrating pressure spot calibrating is completed
Afterwards, start to examine and determine second calibrating point, increase the counterweight 5 of △ m' mass on piston-type pressure meter systems 2 so that treat
The increment for examining and determine 8 swing weight-adding 5 of piston is equal with the increment of swing weight-adding on standard piston 1, i.e. △ m'=△ m.Pass through data
Acquisition process unit 7 obtains the pressure suffered by 8 pressure gauge of fixed piston to be checked at this time, and then obtains first of fixed piston 8 to be checked
Pressure increment △ P' suffered by calibrating pressure spot and the second calibrating pressure spot.And so on, respectively to other level pressure forces to be checked
It measures and records.
Step S3：Obtain the effective area A of standard piston 1；And the significant surface for obtaining fixed piston to be checked is calculated according to formula
Product, the calculation formula of piston gage piston effective area are as follows：
In above-mentioned formula, △ P, △ P'：The increment of standard piston 1 and the pressure suffered by fixed piston to be checked 8 is represented respectively；A,
A'：The effective area of standard piston 1 and fixed piston to be checked 8 is represented respectively.
In specific example, calibrating environment meets the requirement of vertification regulation JJG 59-2007, and standard piston 1 is measurement range
For the piston gage that (1~60) MPa class of accuracies are 0.01 grade, it is detected the identical measurement range that piston is 0.05 grade and lives
Plug pressure gauge, the digital pressure gauge 6 using quartz resonance pressure sensor are that class of accuracy is 0.01 grade, year stability it is excellent
In 0.005%.The data for calculating and measuring according to above method examine and determine initial data with reference to 1 piston effective area of table and table 2 is lived
Effective area calibration calculation is filled in as a result, as follows：
1 piston effective area of table examines and determine initial data
2 piston effective area calibration calculation result of table
By Tables 1 and 2 it is found that in the calibration method proposed in the present embodiment, with the difference generation of adjacent calibrating point pressure indicating value
For indicating value.And since standard and the piston brace rod quality of tested piston are different, the counterbalance mass of first test point
It differs, then as the starting point of detection, in subsequent detection, each standard piston and fixed piston to be checked, detection
The counterweight increment of point is identical.And carry out piston effective area calibrating with conventional calibration method, it is necessary to consider standard and by
The uncertainty that inspection piston is introduced using two sets of counterweights, and the calibration method proposed in the present embodiment obtains the numerical value of each point
All it is same counterweight, without the concern for the uncertainty that counterweight introduces, and then improves the accuracy of calibrating.
Meanwhile in the calibration method proposed in this implementation, each point value measures three times, finally using average weighted
Method obtains experimental result, improves the accuracy of data, reduces the uncertainty that accidental sexual factor is brought.It is surveyed due to increasing
Amount number can reduce uncertainty, but can increase the time of calibrating, in practical applications, it should according to actual conditions come really
The fixed recurring number of regular inspection.
In view of it is possible that obtained data are determined whether that there are coarse by the data exception occurred with 3 σ rules first
Error, in this example without finding gross error, since each group of data all have certain uncertainty, to final result
Influence should be related to the size of uncertainty, specifically square be inversely proportional, therefore using to each with uncertainty
A piston effective area obtains the piston effective area of synthesis by the way of weighted average.
0.01 grade of standard piston, the 1 effective area A passed by metering institute of China National primary standard amount is 0.1001643cm2, meter
The arithmetic mean of instantaneous value that calculation can obtain A' in this example is 0.100102cm2, weighted average is：0.100099cm2。
While new method calibrating is carried out, the reference data under conventional calibration method in order to obtain, in the survey of repeatability
Under the conditions of amount, the tested piston effective area examined and determine using starting balancing method is 0.100099cm2.Conventional calibration method obtains
The data that go out and using the result after new method weighted average after decimal point 6 completely the same, results that two methods obtain
With high consistency, the calibrating for illustrating to carry out piston effective area using new method is feasible.
Further, the scientific feasibility of the method for calibrating piston effective area proposed to illustrate the invention, the present invention
It is evaluated by survey calculation uncertainty, specific evaluation process is as follows：
(1. measuring method) is summarized
1.1 beasurement base：JJG59-2007《Piston gage》Vertification regulation
1.2 measuring environment：Temperature：(20±1)℃；Humidity：≤ 80%.
1.3 standards and corollary equipment：
0.01 grade of piston gage, measurement range：(1~60) MPa
0.01 grade of digital pressure gauge (quartz resonance), indication range：(0~60) MPa
1.4 measurand：0.05 grade of piston gage, measurement range：(1~60) MPa
1.5 measurement process：
1) digital pressure gauge is detected using standard piston pressure gauge, each test point reading three times, read by digital pressure gauge
Number average value PiFor the test point as a result, if first test point is P1For 10MPa, the last one test point P6For 60MPa, inspection
10MPa is divided between measuring point, if Δ Pi=Pi+1-Pi(wherein i i-th of adjacent accredited pressure spot of expression, i=1,2,3,4,5).
2) detect digital pressure gauge using tested piston gage, detecting step is same as above, it is each put reading use with it is upper
The identical counterweight of one step, can equally obtain Δ Pi'=P 'i+1-Pi' (wherein i i-th of adjacent accredited pressure spot of expression, i=1,
2,3,4,5).
2. pattern evaluation：
According to measuring method, the counterbalance mass of each accredited pressure spot addition is essentially equal, i.e.,：Δmi=Δ m 'i, and
Δmi=Δ Pi* A, Δ m'i=Δ Pi' * A', (wherein i i-th of adjacent accredited pressure spot of expression, i=1,2,3. ,) then
Establish following mathematical model：
In formula：A' represents the effective area of fixed piston formula manometer piston to be checked, unit cm2；A represents that 0.01 grade of standard is lived
The effective area of plug manometer piston, unit cm2.Setting：Then formula (1) becomes：
A'=AM (2)
Since independence is uncorrelated between A', A, M, variance is obtained：
u2(A')=c2(A)·u2(A)+c2(M)·u2(M) (3)
In formula：C is sensitivity coefficient, respectively c (A)=M；C (M)=A；
By (3) formula left side divided by A'2, the right divided by (AM)2, obtain
u2 rel(A')=u2 rel(A)+u2 rel(M) (4)
Consider the influence u that piston system out of plumb is broughtrel(δ1), the influence u of environment temperaturerel(δ2), then above formula can represent
For：
u2 rel(A')=u2 rel(A)+u2 rel(M)+u2 rel(δ1)+u2 rel(δ2) (5)
3. uncertainty source analysis
3.1) standard uncertainty u caused by input quantity Arel(A)
Standard uncertainty main source caused by input quantity A is that 0.01 grade of piston manometer piston effective area error is drawn
It rises, is evaluated using B classes method.
3.2) standard uncertainty u caused by input quantity Mrel(M)
Standard uncertainty main source caused by input quantity M is that repetitive test and resolution ratio wherein the greater cause,
The former is evaluated using A classes method, and the latter is evaluated using B classes method.
3.3) input quantity δ1Caused standard uncertainty urel(δ1)
Input quantity δ1Caused standard uncertainty main source is that piston mounting axis out of plumb causes, using B class sides
Method is evaluated.
3.4) input quantity δ2Caused standard uncertainty urel(δ2)
Input quantity δ2Caused standard uncertainty main source is that variation of ambient temperature causes, and is evaluated using B classes method.
4. standard uncertainty is evaluated
4.1) standard uncertainty u caused by input quantity Arel(A)
4.2) standard uncertainty u caused by input quantity Mrel(M)
This item derives from repetition measurement, and 5 result of calculations and relative uncertainty degree of M are respectively：0.999583,
0.013%；0.999234,0.012%；0.999433,0.008%；0.999367,0.008%；0.999267,0.006%；
Weighted arithmetic averageExperimental standard deviation s1It is calculated as follows：Wherein m=5, tiFor i
The power of secondary measurement result, is inversely proportional with relative uncertainty degree square, can be calculated s1=0.005%.Digital pressure gauge resolution ratio
The partial uncertainty of introducing calculates：s2=0.29 δ/10=0.0029%, s2<s1, then sM=s1=0.005%.
4.3) input quantity δ1Caused standard uncertainty urel(δ1)
4.4) input quantity δ2Caused standard uncertainty urel(δ2)
Since a process of measurement can be completed in 1h, laboratory condition can guarantee the temperature within a process of measurement time
Variable quantity it is very little.Therefore the partial uncertainty that temperature change introduces can be ignored.
5. it is measured the evaluation of the combined standard uncertainty of (or output quantity)
3 standard uncertainty component of table is uniformly distributed list
Independently uncorrelated because measuring each amount, then Composite Seismogram is：
6. expanded uncertainty
Measurement range (1~60) MPa, 0.01 grade of piston gage are examined and determine 0.05 grade of piston-type pressure and are calculated as：Urel=
kurel=0.011%, k=2.
It can be seen that calibration method proposed by the present invention carries out 0.05 grade of piston effective area calibrating, expanded uncertainty
It is 0.01%, the amount for meeting regulatory requirements is passed than requirement.
Compared with the prior art, the present invention is same by the way that standard piston, fixed piston to be checked and digital pressure gauge are loaded in
On piston-type pressure meter systems, and on standard piston and fixed piston to be checked add and subtract phase homogenous quantities counterweight, make to be placed on standard
Piston is identical with the increment of the counterweight on fixed piston to be checked, so only need to by digital pressure gauge obtain accordingly standard piston and
The increment of the pressure of fixed piston to be checked, so that it may obtain piston gage piston effective area, not need to whether judge two-piston
Reach dynamic equilibrium simultaneously, it is not required that plus-minus miniweights so that common staff can be completed to piston be pressure in respect of
The calibrating of area is imitated, it is simple and practical, it greatly improves work efficiency.
The invention is not limited in the above embodiment, if the various changes or deformation to the present invention do not depart from the present invention
Spirit and scope, if these changes and deformation belong within the scope of the claim and equivalent technologies of the present invention, then this hair
It is bright to be also intended to comprising these changes and deformation.
Claims (9)
1. a kind of calibration method of piston gage piston effective area, it is characterised in that：Include the following steps：
Step S1：The swing weight-adding on standard piston records the increment of the counterbalance mass of plus-minus, accordingly obtains standard piston and reaches
The increment △ P of suffered pressure during to balance；
Step S2：The swing weight-adding on fixed piston to be checked, the increment and standard for making the counterbalance mass added and subtracted in fixed piston to be checked are lived
The increment for the counterbalance mass added and subtracted beyond the Great Wall is equal；Obtain the increment △ P' that fixed piston to be checked reaches pressure suffered during balance；
Step S3：The effective area A of standard piston is obtained, and the effective area for obtaining fixed piston to be checked is calculated according to formula；It is public
Formula is as follows：
In above-mentioned formula, △ P, △ P'：The increment of standard piston and the pressure suffered by fixed piston to be checked is represented respectively；A, A'：Point
Not Biao Shi standard piston and fixed piston to be checked effective area.
2. the calibration method of piston gage piston effective area according to claim 1, it is characterised in that：In step
In S1, the standard piston is loaded on a piston-type pressure meter systems, and it is liquid or gas that which used, which makes pressure medium,
Body；One presser unit on piston-type pressure meter systems is set, is pressurizeed by presser unit to piston-type pressure meter systems,
Standard piston is made to reach balance and every time in same operating position, be rotated with the clockwise direction of (30~60) r/min.
3. the calibration method of piston gage piston effective area according to claim 2, it is characterised in that：In step
In S2, the fixed piston to be checked is loaded on the piston-type pressure meter systems, what which used make pressure medium for liquid or
Person's gas；The counterweight equal with counterweight increment on standard piston is added and subtracted on fixed piston to be checked, by presser unit to piston type
Manometer systems pressurize, and fixed piston to be checked are made to reach balance and every time in same operating position, with (30~60) r/min
Clockwise direction rotation.
4. the calibration method of piston gage piston effective area according to claim 1, it is characterised in that：In step
In S1 and S2, pressure size to be examined and determine as needed, the swing weight-adding on standard piston and fixed piston to be checked successively, record
It is the adjacent increment of counterbalance mass examined and determine and added and subtracted between pressure spot, acquisition is that standard piston and fixed piston to be checked are reaching balance
Increment △ P and the △ P' of suffered pressure between Shi Xianglin calibrating pressure spots.
5. the calibration method of the piston gage piston effective area according to any claim in claim 1-4,
It is characterized in that：A digital pressure gauge is loaded on piston-type pressure meter systems；By digital pressure gauge measurement standard piston and
Piston to be measured reaches pressure suffered during balance, and calculates the increment △ P for the pressure for obtaining standard piston and piston to be measured respectively
The increment △ P' of pressure.
6. a kind of piston gage piston for realizing calibration method according to any one of claims 1 to 5 is effective
The calibrating installation of area, it is characterised in that：Including standard piston, digital pressure gauge, presser unit, piston-type pressure meter systems and
Several counterweights；The standard piston and fixed piston to be checked are loaded on piston-type pressure meter systems；The counterweight is placed on institute
It states on standard piston or fixed piston to be checked；The presser unit is pressurizeed to the piston-type pressure meter systems；The digital pressure
Meter is loaded on the piston-type pressure meter systems, with the pressure suffered by measurement standard piston or fixed piston to be checked；Further include one
Data acquisition process unit；The digital collection processing unit connect with the digital pressure gauge and receives the digital pressure gauge
The pressure signal of transmission.
7. the calibrating installation of piston gage piston effective area according to claim 6, it is characterised in that：The number
Sensor in word pressure gauge is quartz resonance pressure sensor.
8. the calibrating installation of piston gage piston effective area according to claim 7, it is characterised in that：It further includes
Prepressing units, the prepressing units are arranged on the piston-type pressure meter systems.
9. the calibrating installation of piston gage piston effective area according to claim 8, it is characterised in that：The work
It fills in calibrating installation and is equipped with and connect respectively with the standard piston, fixed piston to be checked, digital pressure gauge, prepressing units and presser unit
Logical standard piston valve, fixed piston valve to be checked, digital pressure gauge valve, prepressing units valve and presser unit valve.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105823596A (en) * | 2016-04-15 | 2016-08-03 | 中国计量科学研究院 | Piston pressure gauge verification and calibration device and method |
| CN108692861B (en) * | 2018-08-13 | 2023-08-01 | 上海市计量测试技术研究院 | Calibrating device and balancing method for piston type pressure gauge |
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