CN104034395B - The liquid small flow standard device of dual Piston rack pinion - Google Patents
The liquid small flow standard device of dual Piston rack pinion Download PDFInfo
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- CN104034395B CN104034395B CN201410293738.1A CN201410293738A CN104034395B CN 104034395 B CN104034395 B CN 104034395B CN 201410293738 A CN201410293738 A CN 201410293738A CN 104034395 B CN104034395 B CN 104034395B
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- magnetic valve
- hydraulic cylinder
- buffer pocket
- delivery port
- dual piston
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Abstract
The invention discloses a kind of liquid small flow standard device of dual Piston rack pinion.Dual Piston tooth bar-gear liquid cylinder pressure in the present invention is fixed by screws on base, base left and right sides all mounting knobs, high class gear tooth bar of the servomotor by key with hydraulic cylinder coordinates rotation, the left and right delivery port of hydraulic cylinder is connected with buffer pocket by stainless joint respectively, and buffer pocket both sides are respectively provided with pressure sensor and temperature sensor；Buffer pocket front and back sides are connected with magnetic valve by ripple flexible pipe respectively；The water inlet of wherein entering water electromagnetic valve is connected with water tank inlet, and the delivery port of water solenoid valve is connected with tested flowmeter by angle coupling.The present invention realizes a closed-loop measuring system with hydraulic cylinder volume as measurement criteria using encoder by piston displacement, velocity feedback to control system.
Description
Technical field
The present invention relates to a kind of small flow standard device, little more particularly, to a kind of liquid of dual Piston tooth bar-gear
Flow standard device.
Background technology
In recent years, the research work in terms of liquid Small flowrate measurement is carried out in many scientific research institutions, and liquid low discharge
The application measured with control in fields such as semiconductor manufacturing industry, bioengineering, medical science chemical industry is more and more common.
At present, piston fluid standard set-up is widely used in liquid low discharge metering verification system, and which has the degree of accuracy
Height, easily realizes the advantages of automating.But there is complex structure, device overall structure distance in traditional piston flow standard set-up
It is long, carry inconvenient, and each run carries out all examining and determine single flowmeter, it is inefficient to wait not enough.
The content of the invention
For the deficiency of background technology, it is an object of the invention to provide a kind of liquid of dual Piston tooth bar-gear is little
Flow standard device.
The technical solution adopted for the present invention to solve the technical problems is：
Dual Piston tooth bar-gear liquid cylinder pressure in the present invention is fixed by screws on base, and base left and right sides is all pacified
Dress handle, high class gear tooth bar of the servomotor by key with hydraulic cylinder coordinate rotation, the left and right delivery port difference of hydraulic cylinder
It is connected with buffer pocket by stainless joint, buffer pocket both sides are respectively provided with pressure sensor and temperature sensor；Before buffer pocket
Trailing flank is connected with magnetic valve by ripple flexible pipe respectively；The water inlet of wherein entering water electromagnetic valve is connected with water tank inlet, water outlet
The delivery port of magnetic valve is connected with tested flowmeter by angle coupling.
Described hydraulic cylinder delivery port upward, can make base horizontal positioned, it is ensured that plant running is steady, while being easy to row
Gas.
Described pressure sensor and temperature sensor can be to system temperature pressure compensations.
Beneficial effects of the present invention：
1. a kind of liquid small flow standard device of dual Piston tooth bar-gear of the invention is a set of fairly perfect master
Dynamic formula liquid flow standard device, its measurement range are 100～2000mL/min, can examine and determine haemodialysis purifier prover
And the flowmeter in the range of corresponding range etc., expanded uncertainty is 0.5% (k=2).
2. the used dual Piston gear-rack cylinder of device, drives the tooth of hydraulic cylinder by servomotor
Wheel, so as to the piston with moving gear bar is run in the cavity of left and right simultaneously, realizes to examining and determine while two tested flowmeters.
3. piston displacement, velocity feedback are given control using encoder with hydraulic cylinder volume as measurement criteria by whole device
System, realizes a closed-loop measuring system.It is mounted with that pressure sensor and temperature sensor can enter trip temperature pressure to system simultaneously
Force compensating, substantially increases the certainty of measurement of device.
Description of the drawings
Fig. 1 is the schematic three dimensional views of apparatus of the present invention
In figure：1st, pressure sensor；2nd, buffer pocket；3rd, temperature sensor；4th, magnetic valve；5th, corrugated flexible hose；6th, water inlet water
Case；7th, magnetic valve；8th, water tank support base；9th, angle coupling；10th, front straight tube；11st, tested flowmeter；12nd, rear straight tube；13rd, it is front
Straight tube；14th, tested flowmeter；15th, rear straight tube；16th, storage tank；17th, magnetic valve；18th, magnetic valve；19th, temperature sensor；20、
Buffer pocket；21st, stainless joint；22nd, pressure sensor；23rd, handle；24th, angle coupling；25th, servomotor；26th, servo electricity
Machine encoder；27th, dual Piston gear-rack cylinder；28th, stainless joint；29th, base.
Specific embodiment
As shown in figure 1, dual Piston tooth bar-gear liquid cylinder pressure 27 is fixed by screws on base 29, base 29 or so
Side all mounting knobs 23, high class gear tooth bar of the servomotor 25 by key with hydraulic cylinder 27 coordinate rotation, hydraulic cylinder 27
Left and right delivery port is all passed through stainless joint 28,21 and is connected with buffer pocket 2,20, and buffer pocket 2,20 both sides are respectively provided with pressure biography
Sensor 1,22 and temperature sensor 3,19；Buffer pocket 2,20 front and back sides are respectively by ripple flexible pipe 5 and magnetic valve 7,4,17,18
Connection；The water inlet of wherein magnetic valve 4,17 is connected with water tank inlet 6, and water tank inlet 6 is placed in water tank support base 8, electricity
The delivery port of magnet valve 7,18 is connected with tested flowmeter 11,14 by angle coupling 9,24.Flow through the inflow of front straight tube 10,13 tested
Flowmeter 11,14, flows through rear straight tube 12,15 afterwards into storage tank 16.
Hydraulic cylinder 27 is standard dual Piston tooth bar-gear liquid cylinder pressure, and which uses high-precision gear and tooth bar,
And key position be all made of using aluminium alloy and stainless steel, with anticorrosive property, and ensure precision while reduce
Cost.The delivery port of hydraulic cylinder 27 upward, can be realized smoothly discharging gas in device horizontal positioned, be conducive to improving device fortune
Stability during row.The left and right delivery port of hydraulic cylinder 27 is connected by stainless joint 28,22.Buffer pocket 2,20 is respectively provided with
Temperature is drawn with pressure by pressure sensor 1,22 and temperature sensor 3,19 according to the thermal coefficient of expansion and coefficient of elasticity of hydraulic cylinder
The deformation error for rising is modified, and makees temperature and pressure compensation by this method to device.Side difference before and after buffer pocket 2,20
Be connected with magnetic valve 4,7,17,18, the water inlet of magnetic valve 4,17 is connected with water tank inlet 6, the delivery port of magnetic valve 7,18 with
Tested flowmeter 11,14 connects.Encoder for servo motor 26 is arranged on the top of servomotor 25, and the position of piston rod is fed back
To control system；Control system is made up of slave computer MSP430 single-chip microcomputers and host computer PC, and its function is control piston movement
Speed, position, gather tested flow meter signal, and sensor signal analyzes verification result.
The course of work of the present invention is as follows：Slave computer control servomotor 25 is while the left and right gear of driving hydraulic cylinder 27
The piston of bar opens magnetic valve 7,18 while producing fluid source with stabilized speed operation, closes magnetic valve 4,17, through buffering
Box 2,20 simultaneously flows through tested flowmeter 11,14, so as to reach while examining and determine the effect of two tested flowmeters 11,14.With
The speed and Displacement Feedback of piston movement are given control system as metered volume standard, encoder for servo motor 26 by hydraulic cylinder 27
System.Control system controls speed, position and the time of piston movement, discharges hydraulic cylinder 27 by calculating in certain time of measuring
Liquid volume flow examining and determine tested flowmeter 11,14.
In formula, each parameter is respectively：
qs--- normal flow, mL/min
Vs--- hydraulic cylinder discharges liquid volume, mL
T --- time of measuring, s
D --- cylinder diameter, cm
L --- piston displacement, cm
E --- the deviation of tested flowmeter；
Q --- actual measurement gained actual flow.
Claims (3)
1. the liquid small flow standard device of dual Piston rack pinion, it is characterised in that：Dual Piston tooth bar-gear hydraulic
Cylinder（27）It is fixed by screws in base（29）On, base（29）Left and right sides all mounting knobs（23）, servomotor（25）Pass through
Key and hydraulic cylinder（27）High class gear tooth bar coordinate rotate, hydraulic cylinder（27）Left and right delivery port connect by left stainless steel
Head（28）With left buffer pocket（2）It is connected, hydraulic cylinder（27）Right delivery port pass through right stainless joint（21）With right buffer pocket
（20）It is connected；Left buffer pocket（2）Both sides are respectively provided with left pressure sensor（1）With left temperature sensor（3）；Right buffer pocket（20）
Both sides are respectively provided with right pressure sensor（22）With right temperature sensor（19）；Left buffer pocket（2）Front and back sides pass through line respectively
Ripple flexible pipe（5）With the first magnetic valve（7）, the second magnetic valve（4）Connection；Right buffer pocket（20）Front and back sides are soft by ripple respectively
Pipe（5）With the 3rd magnetic valve（17）, the 4th magnetic valve（18）Connection；Wherein the second magnetic valve（4）, the 3rd magnetic valve（17）Enter
The mouth of a river and water tank inlet（6）Connection, the first magnetic valve（7）Delivery port pass through the first angle coupling（9）With the first tested flow
Meter（11）Connection；4th magnetic valve（18）Delivery port pass through the second angle coupling（24）With the second tested flowmeter（14）Even
Connect.
2. the liquid small flow standard device of dual Piston rack pinion according to claim 1, it is characterised in that：It is described
Hydraulic cylinder（27）Delivery port upward, can make base（29）Horizontal positioned, it is ensured that plant running is steady, while being easy to exhaust.
3. the liquid small flow standard device of dual Piston rack pinion according to claim 1, it is characterised in that：It is described
Left pressure sensor（1）, right pressure sensor（22）With left temperature sensor（3）, right temperature sensor（19）Can be to system
Carry out temperature and pressure compensation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410293738.1A CN104034395B (en) | 2014-06-25 | 2014-06-25 | The liquid small flow standard device of dual Piston rack pinion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410293738.1A CN104034395B (en) | 2014-06-25 | 2014-06-25 | The liquid small flow standard device of dual Piston rack pinion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104034395A CN104034395A (en) | 2014-09-10 |
| CN104034395B true CN104034395B (en) | 2017-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410293738.1A Expired - Fee Related CN104034395B (en) | 2014-06-25 | 2014-06-25 | The liquid small flow standard device of dual Piston rack pinion |
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| Country | Link |
|---|---|
| CN (1) | CN104034395B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1715306A1 (en) * | 2005-04-21 | 2006-10-25 | Instromet International N.V. | Method and calibration system for calibrating a flow meter. |
| CN102680057A (en) * | 2012-05-17 | 2012-09-19 | 上海市计量测试技术研究院 | Piston type gas-liquid dual-purpose micro-flow standard device |
| CN203385466U (en) * | 2013-06-08 | 2014-01-08 | 浙江省计量科学研究院 | Electric drive symmetrical plunger type gas micro flow standard device |
| CN203940910U (en) * | 2014-06-25 | 2014-11-12 | 中国计量学院 | A kind of liquid low discharge standard set-up of dual Piston rack pinion |
-
2014
- 2014-06-25 CN CN201410293738.1A patent/CN104034395B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1715306A1 (en) * | 2005-04-21 | 2006-10-25 | Instromet International N.V. | Method and calibration system for calibrating a flow meter. |
| CN102680057A (en) * | 2012-05-17 | 2012-09-19 | 上海市计量测试技术研究院 | Piston type gas-liquid dual-purpose micro-flow standard device |
| CN203385466U (en) * | 2013-06-08 | 2014-01-08 | 浙江省计量科学研究院 | Electric drive symmetrical plunger type gas micro flow standard device |
| CN203940910U (en) * | 2014-06-25 | 2014-11-12 | 中国计量学院 | A kind of liquid low discharge standard set-up of dual Piston rack pinion |
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| Publication number | Publication date |
|---|---|
| CN104034395A (en) | 2014-09-10 |
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Granted publication date: 20170329 Termination date: 20210625 |