CN2890855Y - Piston type flow calibrator employing zero balance method - Google Patents
Piston type flow calibrator employing zero balance method Download PDFInfo
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- CN2890855Y CN2890855Y CN 200520117419 CN200520117419U CN2890855Y CN 2890855 Y CN2890855 Y CN 2890855Y CN 200520117419 CN200520117419 CN 200520117419 CN 200520117419 U CN200520117419 U CN 200520117419U CN 2890855 Y CN2890855 Y CN 2890855Y
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Abstract
The utility model relates to a zero-balance piston type flow regulator, which comprises a frame, cylinder on the frame and a generator which drives the piston in the cylinder whose far piston driving terminal is equipped with a flow meter port, wherein a front and a rear chambers are formed between the cylinder and the piston, and the cylinder communicates the front and the rear chambers through a bypass which is provided with a fluid inlet. The utility model is characterized in that the bypass tube communicates with the front and the rear chambers of the cylinder piston to achieve a balanced conformation of the front and the rear temperature pressure of the piston, to greatly reduce the driving force for the piston movement, to make it possible for the regulator to choose a stepper motor as the power, to improve the operation features of small flow, to enlarge the flow detecting ranges of the regulator and to realize dynamic leak supervision. Simultaneously, the utility model makes it possible to directly detect critical flow meter due to the continuant operation of the device, and the device is applied in researches on air compression factors and flow conversion coefficient of various air media or the like.
Description
Technical field
The utility model relates to device for testing flow metrological testing technology field, is a kind of null-balance method piston type traffic alignment device based on the zero balancing Principles of Regulation, can be used for the calibration and the calibrating of gas, liquid, critical flow flowmeter flowrate measurement value.
Technical background
The basic structure of present common gas piston formula traffic alignment device both at home and abroad as shown in Figure 1.It comprises compositions such as frame 19 ", frame on cylinder block 1 ", piston 17 ", gas admittance valve 6 ", screw mandrel 13 ", servomotor 12 " and measuring instrument.Generally be installed in wireway 2 " rear portions by the school flowmeter.Principle of work is operating system instruction servomotor 12 " rotate, make the piston in the cylinder body do translation motion through gear driving screw mandrel, screw mandrel running, piston motion " is squeezed " and gone out fluid, makes the tested flowmeter 3 of flowing through ".When liquid pressure rise and after stablizing, " distance of recording and analyses motion and corresponding time because piston diameter is known, can get flow through simple mathematical calculating to measuring instrument 4.As if the indication flow of the tested flowmeter of measuring instrument synchronous recording, then realize the assay calibration of flowmeter." interior gaseous tension boosts to this process of voltage stabilizing to air chamber 5 when this class device mainly exists defective to be work, so piston or effective cylinder volume utilization factor are low; Servomotor and gear when low-speed running (during low discharge) easily make piston produce creeping phenomenon, the accuracy that influence is measured, and therefore the suitable flow range of device is wide inadequately; Also have device can only malleation work, verification continuously, difficult to the calibration of critical flow flowmeter, when working pressure was high, piston actuated power and sealing mechanism design difficulty increased greatly.
Summary of the invention
It is a kind of for positive negative pressure work that the utility model purpose is to provide, the pressure differential of interior two Room of cylinder is zero before and after the piston motion, flow range is wide, has the dynamic leakage monitoring, the testing process uninterrupted current, can adapt to multiple flowmeter, especially can examine and determine the piston type traffic alignment device of critical flow flowmeter.
Above-mentioned purpose of the present utility model is achieved, mainly by the following technical programs: null-balance method piston type traffic alignment device, comprise frame, cylinder body on the frame, motor, piston in the motor-driven cylinder body, the piston actuated end far away of cylinder body is provided with the flowmeter interface, two Room before and after it is characterized in that forming between described cylinder body and the piston, described cylinder body offers fluid inlet by two Room, front and back of shunt valve connection piston on the described shunt valve.Cylinder before and after described shunt valve is communicated with can carry out preset flow, two-way detection, piston useful volume utilization factor height, realizes that uninterrupted current detects, and making calibrating device directly examine and determine the critical flow flowmeter becomes possibility.Described shunt valve is communicated with the design of two Room, front and back of cylinder, makes in-cylinder pressure be in equilibrium state, therefore is difficult for producing leaking; Prior because the balance of this pressure, causing promoting the required power of piston-advance greatly reduces, make the design stepper motor be used as power and become possibility, solve conventional piston formula checker servomotor and when low speed, promoted piston motion and have uneven defective, enlarged the working flow scope of device.
As preferably, be provided with the leak supervision device between described cylinder body and the piston.Can find timely whether device leaks, improve the accuracy of calibrating flowmeter.
As preferably, described shunt valve is provided with flowmeter and takes over, and described fluid inlet offers on flowmeter is taken over, and described flowmeter is taken over and is provided with flow controller.Utilize shunt valve, can under dynamically, carry out flow regulation, the useful volume utilization factor height in the cylinder body; The described flow controller indication bypass flow and the flow direction, for computer regulating stepper motor rotating speed, the quick adjustment flow is played in the design of current direction indicator.
As preferably, described shunt valve is provided with current direction indicator.Can in time react the pressure differential in the cylinder body, by the computer control motor movement with regulate flow controller and regulate pressure differential in the cylinder body, reach the state that needs.
As preferably, described leak supervision device is the sealing ring on the cylinder body, and sealing ring left and right sides groove is provided with O-ring seal, and medial launder is the Leak Detection groove, and the groove internal pressure is drawn by a conduit.Described calibrating device architectural feature is that sealing ring is divided into preceding cylinder and back cylinder with cylinder, leave the gap between piston and the cylinder body, front and back cylinder air chamber symmetric design, cylinder all can be used as measurement standard after piston entered preceding cylinder, and looking measurand selection use malleation still is the detection of negative pressure calibration; By shunt valve, preceding cylinder and back cylinder are communicated with, cylinder temperature pressure is identical when making work; Change by the pressure that detects in the leakage grooves, realize the leakage situation between the cylinder of dynamic monitoring front and back, improve the reliability of testing result.
As preferably, computing machine (controller) during with the step motor and current direction indicator is electrically connected, a cap is provided with light-operated beacon, described light-operated beacon is electrically connected with computing machine.The required driving force of piston motion is little, and motor can adopt stepper motor, has solved the motion of servomotor when low speed, causes not at the uniform velocity shortcoming of piston motion; The setting of cursor letter control is except that instruction step motor advance and retreat are the piston motion direction, if the configuring external grating also can be used as the displacement device when checking the screw mandrel measuring accuracy.
As preferably, the cylinder body of the screw mandrel end far away of described cylinder is provided with pressure unit and temperature transmitter.Cylinder inner fluid temperature, pressure sensor, signal is delivered to computing machine; Described stepper motor is accepted computing machine, controller instruction, changes rotating speed and promptly changes flow; Described light-operated beacon signal connects computing machine, instruction piston motion direction.The distance of passing through according to piston motion, and temperature, pressure calculates and obtains flow.
As preferably, described piston is connected with described screw mandrel by the silk cap, and described light-operated beacon is arranged on the described silk cap.Computing machine and stepper motor, light-operated beacon control linkage realize detecting robotization, can accurately measure the distance of piston motion.
Therefore, the null-balance method piston type traffic alignment device that the utility model provides, have characteristics: shunt valve is communicated with two Room, front and back of cylinder piston, make piston front and back temperature, pressure reach the structure of balance, and the design of zero balancing Principles of Regulation, the required driving force of piston motion is reduced greatly, make checker select for use stepper motor to be used as power and become possibility, improved the low discharge operating characteristic, enlarged calibrating device flow detection scope, also realized the dynamic leakage monitoring, device just negative pressure bidirectional detects calibration, the more important thing is because the uninterrupted current operating characteristic of device, make direct calibrating critical flow flowmeter become possibility, device also can be used for the gas compressibility factor, the research of aspects such as gas with various rate-of flow reduction coefficient.
Description of drawings
Accompanying drawing 1 is a kind of structural representation of conventional calibration device;
Accompanying drawing 2 is a kind of structural representations of the present utility model.
Among the figure: 1. cylinder body, 2. shunt valve, 3. fluid inlet, 4. the leak supervision device, 5. flowmeter take over, 6. flow controller, 7. current direction indicator, 8. grooved ring, 9. O-ring seal, 10. pressure measurement siphunculus, 11. computer controls, 12. stepper motors, 13. screw mandrels, 14. light-operated beacons, 15. pressure units, 16. temperature transmitters, 17. pistons, 18. caps, 19. frames.
[embodiment]
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: null-balance method piston type traffic alignment device, as shown in Figure 2, it comprises frame 19, cylinder body 1 on the frame 19, stepper motor 12, the piston 17 of motor in screw mandrel silk cap means drives cylinder body, the piston actuated end far away of cylinder body 1 is provided with the flowmeter interface, and computer control 11 is electrically connected with stepper motor 12, and light-operated beacon 14 is electrically connected with computer control 11; Described piston 17 is connected with described screw mandrel 13 by silk cap 18, and described light-operated beacon 14 is arranged on the described silk cap 18.Two Room before and after described cylinder body and piston are divided into by sealing ring, described cylinder body 1 are communicated with two Room, front and back of piston/cylinder by shunt valve 2; Described shunt valve 2 is provided with flowmeter and takes over 5, and fluid inlet 3 offers at flowmeter and takes on 5, and described flowmeter is taken over 5 and is provided with flow controller 6; Described shunt valve 2 is provided with current direction indicator 7; Be provided with leak supervision device 4 between described cylinder body 1 and the piston, described leak supervision device 4 is the continuous sealing ring that is provided with three grooved rings 8 on the cylinder body 1, respectively be provided with O-ring seal 9 in the sealing ring 8 at two ends, grooved ring between two O-ring seals 9 is the Leak Detection groove, and the Leak Detection groove is connected with a conduit 10; The cylinder body of the screw mandrel end far away of described cylinder is provided with pressure unit 15 and temperature transmitter 16.
During device work, make fluid flow to the cylinder front and rear part, enter measured flux meter (during the negative pressure verification, fluid is introduced into tested flowmeter, enters cylinder again) again through galvanostat (in case of necessity) access to plant bypass sieve; After determining by the school flow, click computing machine, stepper motor then drives the ball screw rotation with a certain speed (being flow), and screw mandrel rotating band movable wire cap advances, and silk cap driven plunger is done translation motion; Piston advances forward " is squeezed " and is gone out fluid, make and flow through by the school flowmeter, the piston motion rear portion " stays " space that goes out to be continued the fluid filled that enters, because front and rear part piston volume is designed to identical, enter fluid and keep the initial flow state all the time, be flow, pressure, temperature, be in the zero balancing state before and after piston, under the perfect condition, flow indicator indication this moment flow is zero; Parameters such as computing machine instant recording stepper motor rotating speed (stroke), temperature, pressure, time and flow meter signal obtain calibrated fluxes by certain calculated with mathematical model.
Claims (8)
1. null-balance method piston type traffic alignment device, comprise frame, cylinder body on the frame, motor, piston in the motor-driven cylinder body, the piston actuated end far away of cylinder body is provided with the flowmeter interface, two Room before and after it is characterized in that forming between described cylinder body and the piston, described cylinder body (1) offers fluid inlet (3) by two Room, front and back of shunt valve (2) connection piston on the described shunt valve (2).
2. null-balance method piston type traffic alignment device according to claim 1 is characterized in that being provided with between described cylinder body (1) and the piston leak supervision device (4).
3. null-balance method piston type traffic alignment device according to claim 1 and 2, it is characterized in that described shunt valve (2) is provided with flowmeter and takes over (5), described fluid inlet (3) offers at flowmeter and takes on (5), and described flowmeter is taken over (5) and is provided with flow controller (6).
4. null-balance method piston type traffic alignment device according to claim 3 is characterized in that described shunt valve (2) is provided with current direction indicator (7).
5. null-balance method piston type traffic alignment device according to claim 2, it is characterized in that described leak supervision device (4) is the sealing ring (8) on the cylinder body (1), sealing ring (8) left and right sides groove is provided with O-ring seal (9), medial launder is the Leak Detection groove, and the groove internal pressure is drawn by a conduit (10).
6. according to claim 1 or 2 or 4 described null-balance method piston type traffic alignment devices, motor (12) and current direction indicator (7) are electrically connected when it is characterized in that computer control (11) with the step, silk cap (18) is provided with light-operated beacon (14), and described light-operated beacon (14) is electrically connected with computing machine (11).
7. null-balance method piston type traffic alignment device according to claim 1 is characterized in that the cylinder body of the screw mandrel end far away of described cylinder is provided with pressure unit (15) and temperature transmitter (16).
8. null-balance method piston type traffic alignment device according to claim 6 is characterized in that described piston (17) is connected with described screw mandrel (13) by silk cap (18), and described light-operated beacon (14) is arranged on the described silk cap (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520117419 CN2890855Y (en) | 2005-12-20 | 2005-12-20 | Piston type flow calibrator employing zero balance method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520117419 CN2890855Y (en) | 2005-12-20 | 2005-12-20 | Piston type flow calibrator employing zero balance method |
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| CN2890855Y true CN2890855Y (en) | 2007-04-18 |
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| CN 200520117419 Expired - Fee Related CN2890855Y (en) | 2005-12-20 | 2005-12-20 | Piston type flow calibrator employing zero balance method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101762307B (en) * | 2010-01-25 | 2011-11-09 | 浙江省计量科学研究院 | Gas flow calibrating device based on bell shape-column shape dual piston structure |
| CN102288264A (en) * | 2011-07-25 | 2011-12-21 | 浙江省计量科学研究院 | Electric drive piston liquid micro flow measurement standard device |
| CN102778332A (en) * | 2011-05-11 | 2012-11-14 | 中国科学院光电研究院 | Micro differential pressure generating and calibrating device |
| CN103759792A (en) * | 2013-12-24 | 2014-04-30 | 兰州空间技术物理研究所 | Micro-flow thermal mass flow controller calibration device and calibration method thereof |
| CN104458492A (en) * | 2014-12-08 | 2015-03-25 | 中国计量学院 | Method and device for calibrating water-encountering gas releasing tester |
| CN104501914A (en) * | 2011-10-14 | 2015-04-08 | 丹尼尔测量和控制公司 | Flowmeter Calibrator And Flowmeter Calibrating Method |
| CN105387975A (en) * | 2015-12-31 | 2016-03-09 | 无锡宝瑞德科技有限公司 | Ultralow temperature balance sealing ring leakage amount testing device |
| CN103994806B (en) * | 2014-05-20 | 2017-01-04 | 浙江省计量科学研究院 | Dual cavity piston fluid aligner |
| CN109375674A (en) * | 2018-11-14 | 2019-02-22 | 浙江大学 | A kind of thermostat that gas medium heat-function is adjusted |
| CN114485815A (en) * | 2022-02-22 | 2022-05-13 | 江苏华尔威科技集团有限公司 | Novel balance channel flowmeter |
-
2005
- 2005-12-20 CN CN 200520117419 patent/CN2890855Y/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101762307B (en) * | 2010-01-25 | 2011-11-09 | 浙江省计量科学研究院 | Gas flow calibrating device based on bell shape-column shape dual piston structure |
| CN102778332A (en) * | 2011-05-11 | 2012-11-14 | 中国科学院光电研究院 | Micro differential pressure generating and calibrating device |
| CN102778332B (en) * | 2011-05-11 | 2015-01-07 | 中国科学院光电研究院 | Micro differential pressure generating and calibrating device |
| CN102288264A (en) * | 2011-07-25 | 2011-12-21 | 浙江省计量科学研究院 | Electric drive piston liquid micro flow measurement standard device |
| CN102288264B (en) * | 2011-07-25 | 2012-09-26 | 浙江省计量科学研究院 | Electric drive piston liquid micro flow measurement standard device |
| CN104501914A (en) * | 2011-10-14 | 2015-04-08 | 丹尼尔测量和控制公司 | Flowmeter Calibrator And Flowmeter Calibrating Method |
| CN103759792A (en) * | 2013-12-24 | 2014-04-30 | 兰州空间技术物理研究所 | Micro-flow thermal mass flow controller calibration device and calibration method thereof |
| CN103759792B (en) * | 2013-12-24 | 2017-01-25 | 兰州空间技术物理研究所 | Micro-flow thermal mass flow controller calibration device and calibration method thereof |
| CN103994806B (en) * | 2014-05-20 | 2017-01-04 | 浙江省计量科学研究院 | Dual cavity piston fluid aligner |
| CN104458492A (en) * | 2014-12-08 | 2015-03-25 | 中国计量学院 | Method and device for calibrating water-encountering gas releasing tester |
| CN105387975A (en) * | 2015-12-31 | 2016-03-09 | 无锡宝瑞德科技有限公司 | Ultralow temperature balance sealing ring leakage amount testing device |
| CN109375674A (en) * | 2018-11-14 | 2019-02-22 | 浙江大学 | A kind of thermostat that gas medium heat-function is adjusted |
| CN109375674B (en) * | 2018-11-14 | 2020-07-10 | 浙江大学 | Constant temperature device for gas medium heat-work regulation |
| CN114485815A (en) * | 2022-02-22 | 2022-05-13 | 江苏华尔威科技集团有限公司 | Novel balance channel flowmeter |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070418 Termination date: 20100120 |