CN201514259U - Device for calibrating liquid flowmeters - Google Patents
Device for calibrating liquid flowmeters Download PDFInfo
- Publication number
- CN201514259U CN201514259U CN2009200526064U CN200920052606U CN201514259U CN 201514259 U CN201514259 U CN 201514259U CN 2009200526064 U CN2009200526064 U CN 2009200526064U CN 200920052606 U CN200920052606 U CN 200920052606U CN 201514259 U CN201514259 U CN 201514259U
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- calibrating
- flowmeter
- storage tank
- conversion valve
- liquid
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Abstract
The utility model relates to the field of equipment for calibrating liquid flowmeters, and aims to solve the technical problems to overcome the defects in the prior art and design a device for calibrating liquid flowmeters capable of carrying out field calibration. The structure comprises a storage tank, a centrifugal pump, a first change-over valve, a calibrating channel and a second change-over valve, wherein the storage tank is used for accommodating calibrating mediums; the centrifugal pump is connected with the storage tank and provides the flow power of the calibrating mediums; and the first change-over valve is connected with a calibrating medium inlet and the centrifugal pump respectively; the calibrating channel allows the first change-over valve to be connected into and is formed by a first pressure gauge, a thermometer, a standard flowmeter, a second pressure gauge, and a pneumatic meter clamping device connected with a flowmeter to be calibrated in sequence, and the standard flowmeter is also connected with the flowmeter to be calibrated through an electronic counter; and the second change-over valve is connected with the calibrating channel, a calibrating medium outlet and the storage tank respectively. The equipment has a simple structure, and can realize two calibrating modes, i.e. off-line calibration and on-line calibration.
Description
Technical field
The utility model relates to the apparatus field that liquid flowmeter is examined and determine, and it is a kind of simple in structure to say so more specifically, and volume is little, examines and determine accurate, safe liquid flowmeter calibrating installation.
Background technology
Liquid flowmeter is to utilize the mechanical measurement element that flowing liquid continuously is divided into single volume part, device with metering liquid cumulative volume amount, being widely used in trade settlement and production control, is the measurement instrument of listing national compulsory calibrating catalogue in.Traditional liquid flowmeter calibrating installation volume is big, can only be installed in fixing calibrating place.Enterprise can only deliver to flowmeter when inspecting by ready samples to install after metrological service examines and determine again and go back, and produces to enterprise and causes very big influence.Stipulate according to vertification regulation, need during meter proof flowmeter and standard place fluid temperature mean value, liquid gauge pressure mean value formula according to the rules are converted to the cumulative flow value under the meter proof condition, lot of data is calculated and is caused data to make mistakes easily, even causes the conclusion mistake.
The utility model content
Technical problem to be solved in the utility model is the defective that overcomes prior art, designs a kind of liquid flowmeter calibrating installation that can carry out on-site proving.
The utility model is achieved through the following technical solutions its goal of the invention.
The liquid flowmeter calibrating installation that this patent is designed, its structure comprises:
Be used to adorn the storage tank of calibrating medium;
Connect storage tank, the centrifugal pump of examining and determine media flow power is provided;
First conversion valve that connects calibrating medium inlet and centrifugal pump respectively;
The calibrating passage that first conversion valve inserts, the calibrating passage is made of first tensimeter, thermometer, proving flowmeter, second tensimeter and the pneumatic meter-clamping apparatus that is connected tested flowmeter successively, and proving flowmeter also is connected by electronic counter with tested flowmeter;
Second conversion valve that connects calibrating passage, calibrating media outlet and storage tank respectively.
This device structure is simple, can realize off-line calibrating and two kinds of calibrating modes of in-line calibration.The calibrating medium is got back to storage tank during the off-line calibrating after centrifugal pump drives the calibrating passage of flowing through from storage tank; To examine and determine medium inlet and outlet during in-line calibration and insert in the liquid line, the calibrating medium is reserved by outlet after inlet enters the calibrating passage of flowing through, and its circulation power is provided by the circulation power of liquid line self.
In order to improve the security of calibrating installation, the utility model is connected the filtrator of cooling down between first conversion valve and calibrating passage, and storage tank is provided with the back-fire relief cap of breathing freely.
In order to inject the calibrating medium to storage tank, between first conversion valve and calibrating passage, also be provided with the 3rd conversion valve that is connected storage tank, can connect and examine and determine medium inlet and storage tank by switching the first and the 3rd conversion valve.Described in addition pneumatic meter-clamping apparatus is arranged in the oil groove, and oil groove is connected with storage tank, by the storage tank fuel feeding.One conversion valve, second conversion valve and the 3rd conversion valve adopt the tee ball valve structure.
For the ease of transporting and can carrying out on-site proving, the whole calibrating installation of this patent is installed on the automobile, and the engine of centrifugal pump connection automobile, provides power by engine.
The electronic counter of this patent connects computing machine, and proving flowmeter is exported with frequency, is converted to integrated flux through electronic counter.Behind the calibrating data input computing machine, computing machine calculates parameters such as cumulative flow value, flowmeter error, repeatability according to formula, and requires to judge verification result according to vertification regulation.For easy to operate being provided with is used to place the display device of proving flowmeter and measured flux meter and the instrument box of notebook computer and printer.
The liquid flowmeter calibrating installation of the utility model design, simple in structure, volume is little, is applicable to vehicle-mountedly, can carry out on-site proving.Adopt the computing machine automatic data processing, and can arrange the calibrating time flexibly, solved a calibrating difficult problem that runs at present, and farthest reduced flowmeter and inspected the influence that causes to enterprise's production by ready samples according to the actual conditions that enterprise produces.This patent reasonably designs pipeline, and being connected and fixed of each parts solves antiseep, electrostatic prevention, problem such as explosion-proof, reaches the oil storage safety production standard, and the stable power that utilizes vehicle motor to provide is safely realized the circulation of pipeline, and flow range can reach 96m
3/ h has substantive distinguishing features and progress with respect to prior art.
Description of drawings
Fig. 1 is the liquid flow synoptic diagram of the utility model off-line calibrating;
Fig. 2 is the liquid flow synoptic diagram of the utility model in-line calibration.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
In conjunction with illustrated in figures 1 and 2, this liquid flowmeter calibrating installation has been taken into account online calibrating and off-line type calibrating, mainly partly is made up of storage tank 17, centrifugal pump 16, first tee ball valve 141, second tee ball valve 10, the 3rd tee ball valve 143, the 4th tee ball valve 144, the filtrator 1 of cooling down, proving flowmeter 4, pneumatic tong-test ammeter platform 12, instrument box 15 etc.First tee ball valve 141, the 3rd tee ball valve 143 and the 4th tee ball valve 144 are installed in the flow direction that is used for the control verification medium on the instrument box 15.The display device of proving flowmeter 4 and measured flux meter 7 and notebook computer and printer also are installed on the instrument box in addition, are convenient to operation.The filtrator 1 of cooling down connects first tensimeter 2, thermometer 3, proving flowmeter 4, second tensimeter 6 and the pneumatic meter-clamping apparatus 12 that is connected tested flowmeter 7, straight-through valve 9, second tee ball valve 10 and calibrating media outlet 11 successively; Proving flowmeter 4 also is connected by electronic counter 5 with tested flowmeter 7, and electronic counter 5 connects computing machine; Above-mentioned member forms the check passage, mainly is installed on the operating platform 19.
The whole calibrating installation of this patent is installed on the automobile, is convenient to move.Above-mentioned storage tank 17 volumes are about 3 cubic metres, and the calibrating medium is provided when can be the off-line calibrating.Storage tank 17 is provided with the ventilative cap 18 of back-fire relief, is used for storage calibrating medium, and it also is connected with the oil groove 8 that holds pneumatic meter-clamping apparatus 12, is used for to oil groove 8 supply calibrating media.Centrifugal pump 16 can be the off-line calibrating circulation power is provided, and can adopt motor car engine to provide power for centrifugal pump 16.The filtrator 1 of cooling down can be eliminated the gas in the liquid, guarantees to measure result's accuracy.Proving flowmeter 4 adopts U.S. Brodie company duplex rotor meters, and its linear accuracy and repeatability reaches respectively ± and 0.1% and 0.1%, adopt frequency output.Proving flowmeter 4 is converted to integrated flux with frequency output through electronic counter 5.Behind the calibrating data input computing machine, computing machine calculates parameters such as cumulative flow value, flowmeter error, repeatability according to formula, and requires to judge verification result according to vertification regulation.Specifically be calculated as follows:
Fundamental formular V=V
sC
In the formula: V-liquid volume value;
V
s-standard is read bulking value;
The correction factor of C-proving flowmeter.
The V value is converted to the integrated flux actual value under the meter proof condition:
Q
s＝V[1+β(t
m-t
s)][1-k(p
m-p
s)]
In the formula: Q
s-standard place liquid volume value is converted to cumulative flow value under the flowmeter condition
β-expansion of liquids coefficient;
The k-liquid compressibility factor;
t
m, t
s-be respectively flowmeter and standard place fluid temperature mean value;
p
m, p
s-be respectively flowmeter and standard place liquid gauge pressure mean value.
Under the situation of the amount of influence less than flowmeter limit of intrinsic error 1/10, the modifying factor in the publicity can be simplified, i.e. C=1, β=0.
The calibrating flow process is as follows:
(1) preliminary work
At first the outward appearance of tested flowmeter 7 is checked.The flowmeter appearance should have surface of good to handle, and does not have defectives such as visible burr, crackle, corrosion or mildew; Indicating device is high-visible, and operation is normal, no catching phenomenon; The fluid passage of flowmeter should be cleaned, and inside surface should be smooth; Should indicate at the obvious position of housing and flow to sign, should clearly mark information such as manufacturing plant, measurement instrument manufacturing license sign, inside nominal diameter, flow range, class of accuracy on housing or the nameplate, and input computer, at last tested flowmeter flatly is installed on the pneumatic tong-test ammeter platform, indicating device up.
(2) calibrating/calibration
During the off-line type calibrating, as shown in Figure 1, the calibrating medium by storage tank 17 through the 4th tee ball valve 144 to centrifugal pump 16, enter the filtrator 1 of cooling down by first tee ball valve 141 and the 3rd tee ball valve 143 again, enter proving flowmeter 4 through first tensimeter 2 and thermometer 3, get back to storage tank 17 by second tee ball valve 10 at last, realize circulation.Its circulation power is provided by centrifugal pump 16, and the bump joint and the blanking cover 11 and 13 of calibrating medium gateway are all closed.
Medium be will examine and determine during calibrating and tested flowmeter 7 cavitys and passage filled with, progressively increase pressure to 1.5 times nominal pressure, last 5 minutes, flowmeter should not damage or seepage, generally use and the liquid that do not cause instrument corrosion and damage close with fluid to be measured viscosity as experimental liquid or the use liquid identical with tested flowmeter as the calibrating medium.Flowmeter carries out the fundamental error calibrating in operation under 70%～100% maximum flow after 5 minutes, according to the relevant requirements of JJG667-1997 " liquid capacity formula flowmeter " flowmeter is examined and determine and automatic data collection item by item.
During online calibration proving flowmeter is connected in series in the tested flowmeter pipeline, tested flowmeter is calibrated by the error of indication of proving flowmeter and tested flowmeter.As shown in Figure 2, proving flowmeter 4 is concatenated in the liquid line, circulation power is provided by the circulation power of liquid line self.Liquid enters the filtrator 1 of cooling down by the bump joint and the blanking cover 13 of the calibrating medium inlet that is connected to calibrating installation by the road, enter proving flowmeter 4 through first tensimeter 2 and thermometer 3, bump joint and blanking cover 11 places by tee ball valve 10 and calibrating media outlet are connected in the liquid circulation line at last.
(3) data processing
After calibrating is finished, will examine and determine data entry program, data processing software judges automatically according to vertification regulation and verification result whether this flowmeter reaches requirement, meets the requirements of to provide calibration certificate, do not reach requirement, provides rejection notice of verification.But field print certificate after the configure printer.
(4) aftertreatment
After calibrating is finished, in time unload flowmeter, and calibrating installation is cleaned.Liquid flow direction was identical when liquid flow direction was examined and determine with off-line during cleaning, and different is that medium is a high pressure steam.
Claims (8)
1. liquid flowmeter calibrating installation is characterized in that comprising:
Be used to adorn the storage tank of calibrating medium;
Connect storage tank, the centrifugal pump of examining and determine media flow power is provided;
First conversion valve that connects calibrating medium inlet and centrifugal pump respectively;
The calibrating passage that first conversion valve inserts, the calibrating passage is made of first tensimeter, thermometer, proving flowmeter, second tensimeter and the pneumatic meter-clamping apparatus that is connected tested flowmeter successively, and proving flowmeter also is connected by electronic counter with tested flowmeter;
Second conversion valve that connects calibrating passage, calibrating media outlet and storage tank respectively.
2. liquid flowmeter calibrating installation according to claim 1 is characterized in that first conversion valve is connected the filtrator of cooling down with calibrating between the passage.
3. liquid flowmeter calibrating installation according to claim 1 is characterized in that storage tank is provided with the ventilative cap of back-fire relief.
4. liquid flowmeter calibrating installation according to claim 2, it is characterized in that first conversion valve also is provided with the 3rd conversion valve that is connected storage tank with calibrating between the passage, first conversion valve, second conversion valve and the 3rd conversion valve employing tee ball valve structure.
5. liquid flowmeter calibrating installation according to claim 1 is characterized in that pneumatic meter-clamping apparatus is arranged in the oil groove.
6. liquid flowmeter calibrating installation according to claim 5 is characterized in that described oil groove is connected with storage tank.
7. according to each described liquid flowmeter calibrating installation of claim 1 to 6, it is characterized in that electronic counter connects computing machine.
8. liquid flowmeter calibrating installation according to claim 7 is characterized in that being provided with and is used to place the display device of proving flowmeter and measured flux meter and the instrument box of notebook computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200526064U CN201514259U (en) | 2009-03-13 | 2009-03-13 | Device for calibrating liquid flowmeters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200526064U CN201514259U (en) | 2009-03-13 | 2009-03-13 | Device for calibrating liquid flowmeters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201514259U true CN201514259U (en) | 2010-06-23 |
Family
ID=42485671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200526064U Expired - Lifetime CN201514259U (en) | 2009-03-13 | 2009-03-13 | Device for calibrating liquid flowmeters |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201514259U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076067A (en) * | 2011-10-25 | 2013-05-01 | 中国石油化工股份有限公司 | Full-automatic online calibrating device and calibrating method for vehicle-mounted large-aperture flow meter and calibrating method |
| CN103712669A (en) * | 2014-01-16 | 2014-04-09 | 中国人民解放军海军航空工程学院 | Flow gauge online calibration device |
| CN104596748A (en) * | 2014-12-26 | 2015-05-06 | 舟山市恒威船舶配件有限公司 | Water flow test device of air pipe head |
-
2009
- 2009-03-13 CN CN2009200526064U patent/CN201514259U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076067A (en) * | 2011-10-25 | 2013-05-01 | 中国石油化工股份有限公司 | Full-automatic online calibrating device and calibrating method for vehicle-mounted large-aperture flow meter and calibrating method |
| CN103712669A (en) * | 2014-01-16 | 2014-04-09 | 中国人民解放军海军航空工程学院 | Flow gauge online calibration device |
| CN104596748A (en) * | 2014-12-26 | 2015-05-06 | 舟山市恒威船舶配件有限公司 | Water flow test device of air pipe head |
| CN104596748B (en) * | 2014-12-26 | 2017-03-01 | 舟山市恒威船舶配件有限公司 | A kind of discharge assay device of air pipe head |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100623 |