CN110285860A - A kind of piston-type flow-meter and its measurement method - Google Patents
A kind of piston-type flow-meter and its measurement method Download PDFInfo
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- CN110285860A CN110285860A CN201910619570.1A CN201910619570A CN110285860A CN 110285860 A CN110285860 A CN 110285860A CN 201910619570 A CN201910619570 A CN 201910619570A CN 110285860 A CN110285860 A CN 110285860A
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- 238000000691 measurement method Methods 0.000 title abstract description 5
- 239000012530 fluid Substances 0.000 claims abstract description 73
- 238000006073 displacement reaction Methods 0.000 claims abstract description 42
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 230000033001 locomotion Effects 0.000 claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 20
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000007306 turnover Effects 0.000 claims description 9
- 235000004443 Ricinus communis Nutrition 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000002457 bidirectional effect Effects 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 7
- 230000004907 flux Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000002775 capsule Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/38—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of a movable element, e.g. diaphragm, piston, Bourdon tube or flexible capsule
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a kind of piston-type flow-meter and its measurement methods, are related to the fields of measurement of fluid flow.The piston-type flow-meter includes guide rod, displacement sensor, at least two groups pipeline, the valve being correspondingly arranged on pipeline and control module；Guide rod is placed in cylinder body, without the capping from cylinder body one end across there is no dynamic sealing problems caused by guide rod, avoid the generation of leakage accident, reduce maintenance workload；Opening and closing by controlling corresponding valve control fluid and enter or be discharged in cylinder body, the motion stress of fluid drives piston motion, piston can drive guide rod to move back and forth along displacement sensor, realize reciprocal bidirectional measuring, improve measurement working efficiency；Fluid is active movement simultaneously, and piston is passive movement, and the structures such as no driving motor, screw component, heavy pedestal, structure is simple, considerably reduces the volume and weight of flowmeter, can carry to work on the spot.
Description
Technical field
The invention belongs to the fields of measurement of fluid flow more particularly to a kind of piston-type flow-meter and its measurement methods.
Background technique
Flow measurement device can very easily measure the flow of liquid, and the device category of current flux measurement is various, because
Principle is different and different, specifically has and flows drive gear rotation by liquid come the device of measuring flow, also has and pass through ultrasonic wave
Spread speed variation measure the flow of fluid, the defect that these flow measurement devices have its certain, measurement accuracy is inadequate
Accurately, device structure is complicated, at high cost.
Although also there is piston type displacement flow measuring device, the guide rod on this kind of flow measurement device piston must be from
The capping of cylinder body one end is across and used gearshift is the externals device such as ball-screw, and guide rod drives ball-screw
Movement, requirement of such structure to dynamic sealing is very high, easily reveals, and needs to dismantle entire piston once leakage,
It must also re-scale after the completion, maintenance workload is very big.And this external displacement sensor, operating environment requirements
Height, and workload is small, can not work always for a long time.Meanwhile existing piston type displacement flow measuring device, piston
It is active piston, generally by driving motor, screw component, cylinder body, piston, pipe-line system, signal generator and computer control
System composition processed.Motor driven screw component rotates when work, and band piston makees linear uniform motion along cylinder body axis, discharge or
Fluid is sucked, the movement of piston is active, and the movement of fluid is passively.Structure is complicated for active piston, and volume is big, weight
Greatly, ontology also needs to be placed on bulky pedestal, further increases the weight of device, can not carry to work on the spot.It is main
Piston is generally one-way fashion structure, that is, can only unidirectionally measure when working, can not reciprocal bidirectional measuring, working efficiency is relatively
It is low.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of piston-type flow-meter and its measurement method, passes through interior set
Displacement sensor detects piston in the intracorporal position of cylinder, corresponds to the opening and closing of valve further according to the position control of piston and realizes piston not
Discontinuously reciprocal operation improves flow measurement essence continuously to measure, while according to the amendment of the temperature of fluid realization fluid flow
Degree.
The present invention is to solve above-mentioned technical problem by the following technical solutions: a kind of piston-type flow-meter, comprising:
Top is equipped with the cylinder body of guide groove, and guide groove is connected to cylinder body；
Set on the intracorporal piston of cylinder；
Guide rod on piston, the guide rod are placed in cylinder body and/or guide groove, and are interior hollow structure；
One end is set to the displacement sensor at the top of guide groove, and the other end of institute's displacement sensors extends to the interior hollow knot of guide rod
Structure；Institute's displacement sensors are used to detect the location information of piston；
At least two groups pipeline, one end of every group of pipeline are connected to the top of the cylinder body, bottom of the other end with the cylinder body
Portion's connection；
The fluid inlet and outlet being opened on every group of pipeline；The fluid inlet and outlet is fluid inlet or fluid outlet；
At least one valve being divided on two lateral line of fluid inlet and outlet；
The exhaust valve being divided on every group of pipeline；
Control module calculates the flow of fluid for the location information and calibrated indexing volumetric values according to piston；And
For according to the location information control valve of piston open and close with by Fluid pressure with piston and guide rod along position
Displacement sensor moves back and forth, and realizes the continuous measurement of fluid in cylinder body.
Further, institute's displacement sensors use magnetostrictive displacement sensor, and magnet ring is set to the guide rod
Top, detection bar pass through the interior hollow structure that magnet ring extends to guide rod.
Further, the pipeline includes two groups, wherein fluid inlet and outlet on one group of pipeline is fluid inlet, another group
Fluid inlet and outlet on pipeline is fluid outlet；The first valve and second are respectively equipped on the pipeline of the fluid outlet two sides
Valve is respectively equipped with third valve and the 4th valve on the pipeline of the fluid inlet two sides；
Control module is also used to control the first valve and the 4th valve opening, the second valve and third according to the location information of piston
Valve is closed；Or the second valve of control and third valve opening, the first valve and the 4th valve are closed.
Further, the valve is angle pedestal valve, and angle pedestal valve has the characteristics that be quick on the draw, it is accurate to act.
Further, the piston-type flow-meter further includes the temperature sensor being connected with the control module, the temperature
Spend temperature of the sensor for fluid in signal piping or cylinder body；
The control module is also used to correct normal flow of its flow to obtain fluid according to the temperature value of fluid.
Further, the piston-type flow-meter further includes the timing module being connected with the control module, the timing
Module is for recording time of measuring；
The control module is also used to obtain being averaged in the time of measuring according to the flow in time of measuring and the time of measuring
Flow.
Further, the piston include piston only and the first sealing ring being sequentially arranged on piston only periphery,
First air bag, the second sealing ring, the second air bag and third sealing ring；First air bag is connected to the second air bag, and the first gas
The outer diameter of capsule and the second air bag is respectively less than the internal diameter of cylinder body.
Further, the quantity of first sealing ring, the second sealing ring and third sealing ring is at least one.
Further, groove is equipped on the piston only between first sealing ring and third sealing ring, it is described recessed
Slot is for containing lubricating oil.
Further, the piston-type flow-meter further includes turnover bracket, and the turnover bracket includes support base and outer
Frame；The piston-type flow-meter is fixedly arranged in outer framework, and outer framework rotation is set on the bracket base.
Piston-type flow-meter is fixed in outer framework, and outer framework rotation is set on bracket base, so that piston-type flow-meter
It can be overturn in support base.
Further, it is equipped with positioning pin between the support base and outer framework, castor is equipped on the outer framework.
Fixation when positioning pin is not overturn for piston-type flow-meter in support base, prevents from putting in support base
It is dynamic.When not working, the piston-type flow-meter with outer framework can be disassembled from support base, carry out moving by castor,
It is easy to carry.
A method of flow measurement being carried out using the piston-type flow-meter, including the following steps:
The information of step (1) acquisition piston-initial-position；
Step (2) controls the opening and closing of corresponding valve according to the initial position message of piston, piston under the pressure of fluid by
Dynamic movement；
Step (3) obtains the location information of piston, goes out fluid flow according to the positional information calculation of piston.
Beneficial effect
Compared with prior art, piston-type flow-meter of the present invention includes guide rod, displacement sensor, at least two groups pipe
The valve and control module being correspondingly arranged on road, pipeline；Guide rod is placed in cylinder body, without wearing from the capping of cylinder body one end
It crosses, there is no dynamic sealing problems caused by guide rod, avoid the generation of leakage accident, reduce maintenance workload；Using
Displacement sensor carries out the displacement measurement of piston, and displacement sensor extends to the interior hollow structure of guide rod, ensure that piston exists
Any position can be detected, without departing from the detection of displacement sensor；The present invention by control corresponding valve unlatching and
It closes control fluid to enter or be discharged in cylinder body, the motion stress of fluid drives piston motion, and piston can drive guide rod
It is moved back and forth along displacement sensor, realizes reciprocal bidirectional measuring, improve measurement working efficiency；Fluid is actively to transport simultaneously
Dynamic, piston is passive movement, and the structures such as no driving motor, screw component, heavy pedestal, structure is simple, considerably reduces stream
The volume and weight of meter can be carried to work on the spot.
Flowmeter of the invention further includes temperature sensor, and by the temperature adjustmemt of fluid, its flow obtains normal stream
Amount, improves the accuracy of flow measurement.
Piston of the invention includes the air bag of two connections, with pressure when the sealing ring on the outside of piston end is revealed
Fluid oppresses the air bag at the end so that the air bag bulging of the other end and contacted with inboard wall of cylinder block, pass through increase piston motion resistance
And know and leak in piston solve the problems, such as that leakage is difficult to find and judges in the prior art.
Detailed description of the invention
It, below will be to attached drawing needed in embodiment description in order to illustrate more clearly of technical solution of the present invention
It is briefly described, it should be apparent that, the accompanying drawings in the following description is only one embodiment of the present of invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of piston-type flow-meter of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of piston of the embodiment of the present invention；
Fig. 3 is the front view of turnover bracket of the embodiment of the present invention；
Fig. 4 is the side view of turnover bracket of the embodiment of the present invention；
Fig. 5 is the electrical connection diagram of programmable controller of the embodiment of the present invention；
Fig. 6 is the electrical connection diagram of displacement sensor of the embodiment of the present invention；Wherein, 1- cylinder body, 101- guide groove, 102- cylinder body end
Lid, 2- piston, the first sealing ring of 201-, the second sealing ring of 202-, 203- third sealing ring, the first air bag of 204-, 205- second
Air bag, 206- groove, 207- air bag connecting tube, 3- guide rod, 4- displacement sensor, 401- magnet ring, the first pipeline of 6-, 601- stream
Body outlet, the first valve of 602-, the second valve of 603-, 604- first row air valve, the second pipeline of 7-, 701- fluid inlet, 702-
Third valve, the 4th valve of 703-, 704- second row air valve, 8- turnover bracket, 801- support base, 802- outer framework, 803-
Positioning pin, 804- rotary shaft, 805- fixed card slot, 806- connecting rod, 807- spacer pin, 808- castor.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, the technical solution in the present invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, those of ordinary skill in the art's every other embodiment obtained without creative labor,
It shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of piston-type flow-meter provided by the present invention, including cylinder body 1, piston 2, guide rod 3, displacement
Sensor 4, temperature sensor, two groups of pipelines and control module.The guide groove being connected to cylinder body 1 is equipped at the top of cylinder body 1
101, piston 2 is placed in cylinder body 1, and is vertically equipped with guide rod 3 on the piston 2, and guide rod 3 and guide groove 101 are coaxially disposed, guiding
Bar 3 is located in cylinder body 1 and guide groove 101, and guide rod 3 is interior hollow structure.The guide rod 3 of the flowmeter is located in cylinder body 1, no
There are problems that dynamic sealing, reduces the generation of leakage accident, reduce maintenance workload.In the top and bottom of cylinder body 1
Further respectively have cylinder end caps 102.
Two groups of pipelines include the first pipeline 6 and the second pipeline 7；It is connected at the top of one end of first pipeline 6 and guide groove 101, the
The other end of one pipeline 6 is connected to 1 bottom of cylinder body, fluid outlet 601 is equipped on the first pipeline 6, and at 601 liang of fluid outlet
The first valve 602 and the second valve 603 are respectively equipped on the pipeline of side.It is connected at the top of one end of second pipeline 7 and cylinder body 1, the
The other end of two pipelines 7 is connected to 1 bottom of cylinder body, fluid inlet 701 is equipped on the second pipeline 7, and at 701 liang of fluid inlet
Third valve 702 and the 4th valve 703 are respectively equipped on the pipeline of side.Is further respectively had on first pipeline 6 and the second pipeline 7
One exhaust valve 604 and second row air valve 704, for draining the gas in the first pipeline 6 and the second pipeline 7.
One end setting of displacement sensor 4 extends to the interior hollow structure of guide rod 3, protects in 101 top of guide groove, the other end
Having demonstrate,proved piston 2 at an arbitrary position has corresponding position detection data, without departing from the control of control module；Temperature sensor is set
It sets at fluid outlet 601.Displacement sensor 4, temperature sensor, the first valve 602, the second valve 603, third valve 702,
4th valve 703 and exhaust valve are connected with control module.Specific control process is as follows:
1, when the initial position of piston 2 is 1 bottom of cylinder body, control module is according to the initial position message of piston 2 control the 4th
Valve 703 and the first valve 602 are opened, and third valve 702 and the second valve 603 are closed, piston 2 under fluid motion pressure to
Upper movement drives guide rod 3 to move upwards along displacement sensor 4；For piston 2 in moving process, displacement sensor 4 issues arteries and veins
Signal is rushed, control module calculates the wink of fluid according to indexing volumetric values calibrated on the pulse signal and piston 2 received
Shi Liuliang, integrated flux.The flowmeter can be used to examine and determine, calibrate Static Volumetric Method water flow standard apparatus, apparatus for calibrating water meter,
All types of fluid flowmeters.
Indexing volume refers to the corresponding volume of unit length or volume.For example, piston moves unit length (this implementation
In example, unit length 1mm) displacement sensor 100 pulses of sending, when control module receives 1000 pulses, expression
Piston moves 10 unit lengths, i.e. 10mm, thus to obtain the volume of fluid, flow is equal to volume/time.
2, when the initial position of piston 2 is 1 top of cylinder body, control module is controlled according to the initial position message of piston 2
Third valve 702 and the second valve 603 are opened, and the 4th valve 703 and the first valve 602 are closed, and piston 2 is in fluid motion pressure
Under move downward, drive guide rod 3 moved downward along displacement sensor 4；Piston 2 in moving process, send out by displacement sensor 4
Pulse signal out, control module calculate fluid according to indexing volumetric values calibrated on the pulse signal and piston 2 received
Instantaneous flow, integrated flux.
The specific formula for calculation of instantaneous flow are as follows: q=N × f/t (1)
Wherein, q indicates that instantaneous flow, N indicate the cumulative number of pulses that the mobile displacement of piston or displacement sensor issue, f table
Show that the indexing capacity on piston, t indicate the piston mobile time.
The specific formula for calculation of integrated flux are as follows: Q=N × f (2)
The temperature that temperature sensor is used to detect fluid improves stream according to fluid temperature (F.T.) modified flow rate to obtain normal flow
Measure accuracy of measurement, specific correction formula are as follows: Q20=Q (1+ β (20-T)) (3)
Wherein, Q20Integrated flux when indicating 20 °, i.e. standard accumulation flow；β indicates that the cubic expansion coefficient of fluid, T indicate fluid
Temperature.
Inventive flow meter can be such that piston is back and forth run incessantly to realize the continuous of flow by the control of valve
Measurement, it is a kind of passive movement that the movement of piston 2 is carried out by Fluid pressure, is not necessarily to driving motor and screw component
Deng greatly reducing the volume and weight of flowmeter.Displacement sensor 4 uses magnetostrictive displacement sensor, magnet ring 401 and inspection
Measuring staff 402 has no direct contact, is unlikely to be rubbed, wear, thus its long service life, strong environmental adaptability, reliability
Height, safety is good, while detection accuracy is also relatively high.
As shown in Fig. 2, piston 2 includes piston only and the first sealing ring being sequentially arranged on piston only periphery
201, the first air bag 204, the second sealing ring 202, the second air bag 205 and third sealing ring 203；First air bag 204 and the second gas
Capsule 205 is connected to by air bag connecting tube 207, and the outer diameter of the first air bag 204 and the second air bag 205 is respectively less than the internal diameter of cylinder body 1.
In the present embodiment, the first sealing ring 201, third sealing ring 203 are one, and the second sealing ring 202 is two, are led to
Crossing four sealing rings makes to seal between piston 2 and cylinder body 1.It is offered on piston only between the second sealing ring of twice 202
Groove 206, groove 206 make to lubricate between cylinder body 1 and piston 2 for placing lubricating oil.
Under normal circumstances, the air pressure balance between the first air bag 204 and the second air bag 205, air bag (i.e. the first air bag
204 and second air bag 205) outer diameter be less than the internal diameter of cylinder body 1, making air bag not influences the normal movement of piston 2；When piston 2 certain
When sealing ring on the outside of one end is revealed, pressurized fluid can reach at the side air bag and oppress the side air bag, make the other side
Air bag bulging and contacted with 1 inner wall of cylinder body, be added significantly to the running resistance of piston 2, pass through air-quantity chart or water inlet end
Pressure change may determine that the interior leakage.
For example, when the first sealing ring 201 is revealed, the first air bag 204 by fluid compressing so that the second air bag
205 bulging and contacted with 1 inner wall of cylinder body；When third sealing ring 203 is revealed, compressing of second air bag 205 by fluid
So that 204 bulging of the first air bag and contacted with 1 inner wall of cylinder body；Both of which will lead to the increase of 2 running resistance of piston, thus
Instantaneous flow reduces, and therefore, may determine that leakage in corresponding according to air-quantity chart.
As shown in Figures 3 and 4, piston-type flow-meter further includes turnover bracket 8, and turnover bracket 8 includes support base 801, outer
Frame 802, positioning pin 803 and castor 808；The cylinder body 1 of piston-type flow-meter is fixed on outer framework by fixed card slot 805
In 802, since cylinder body 1 is cylindrical body in the present embodiment, the both ends of cylinder body 1 can be blocked by the fixed card slot 805 at both ends, just
In fixation of the cylinder body 1 in outer framework 802；It is additionally provided with connecting rod 806 on outer framework 802, connecting rod 806 is by cylinder body 1
The frame of two sides connects, so that entire outer framework 802 is stronger；Rotary shaft 804, support are equipped on outer framework 802
Pedestal 801 is equipped with card slot, and rotary shaft 804 is placed in card slot, and the position of rotary shaft 804 is limited by spacer pin 807, so that
Rotary shaft 804 rotates in card slot, thus rotate the piston-type flow-meter with outer framework 802 in support base 801, so as to
In the overturning of flowmeter；Positioning pin 803 is equipped between outer framework 802 and support base 801 simultaneously, so that piston-type flow-meter
It is fixed on when not overturning in support base 801, prevents from swinging in support base 801 when work.The side of outer framework 802 is also
Equipped with castor 808, spacer pin 807 and positioning pin 803 are pulled out, rotary shaft 804 is taken out out of card slot, to make band outer framework 802
Flowmeter taken out from support base 801, may be implemented the movement of flowmeter by castor 808, it is easy to carry and carry.
As it can be seen in figures 5 and 6, electric control system of the invention, is electrical by the Switching Power Supply U1 of model MDR-60-24
Control section provides 24V power supply, and control module uses model PLC programmable controller U2, PLC programmable controller U2 and mould
Coil (KM1-KM4 in Fig. 3) phase of analog quantity expansion board U3, communication module U4, touch screen and four intermediate relays
Even；The normally opened contact of four intermediate relays is connected with the first valve, the second valve, third valve and the 4th valve respectively, when
PLC programmable controller U2 output high level perhaps low level when correspond to intermediate relay normally opened contact closure or disconnection,
Control corresponding valve opening or closing.Displacement sensor TH1 passes through SSI communication module U6 and CC-Link network adapter U5
It is connected with communication module U4, the remote transmission of measurement data may be implemented.Analog quantity expansion board U3 is for obtaining analog quantity
Data, touch screen is for setup parameter and display measurement result.
In the present embodiment, the type selecting of each module specifically: the model FX3G-14MT of PLC programmable controller U2, mould
The model FX3U-16CCL-M of the model FX3G-2AD-BD of analog quantity expansion board U3, communication module U4, the type of touch screen
Number for GT2103-PMBD, intermediate relay model RJ2S-CL-D24, the model TH1-0425- of displacement sensor TH1
The model NA9131 of model ST5351, the CC-Link network adapter U5 of 102-225-102, SSI communication module U6.For
The communications protocol of cooperation displacement sensor TH1 sets SSI communication module U6 and CC-Link network adapter U5, displacement sensing
The collected position data of device is transferred directly to PLC programmable controller, improves the acquisition precision of position data.
Above disclosed is only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, can readily occur in variation or modification,
It is covered by the protection scope of the present invention.
Claims (12)
1. a kind of piston-type flow-meter characterized by comprising
Top is equipped with the cylinder body (1) of guide groove (101), and guide groove (101) is connected to cylinder body (1)；
Piston (2) in cylinder body (1)；
Guide rod (3) on piston (2), the guide rod (3) are placed in cylinder body (1) and/or guide groove (101), and are interior
Hollow structure；
One end is set to the displacement sensor (4) at the top of guide groove (101), and the other end of institute's displacement sensors (4) extends to guiding
The interior hollow structure of bar (3)；Institute's displacement sensors (4) are used to detect the location information of piston (2)；
At least two groups pipeline, one end of every group of pipeline are connected to the top of the cylinder body (1), the other end with the cylinder body
(1) bottom connection；
The fluid inlet and outlet being opened on every group of pipeline；The fluid inlet and outlet is fluid inlet (701) or fluid outlet
(601)；
At least one valve being divided on two lateral line of fluid inlet and outlet；
The exhaust valve being divided on every group of pipeline；
Control module calculates the flow of fluid for the location information and calibrated indexing volumetric values according to piston (2)；With
And for being opened and closed according to the location information control valve of piston (2) through Fluid pressure band piston (2) and guiding
Bar (3) is moved back and forth along displacement sensor (4), realizes the continuous measurement of cylinder body (1) interior fluid.
2. a kind of piston-type flow-meter as described in claim 1, it is characterised in that: institute's displacement sensors (4) use mangneto
Telescopic displacement sensor, magnet ring (401) are set to the top of the guide rod (3), and detection bar (402) passes through magnet ring (401)
Extend to the interior hollow structure of guide rod (3).
3. a kind of piston-type flow-meter as described in claim 1, it is characterised in that: the pipeline includes two groups, wherein one group
Fluid inlet and outlet on pipeline is fluid inlet (701), and the fluid inlet and outlet on another group of pipeline is fluid outlet (601)；?
It is respectively equipped with the first valve (602) and the second valve (603) on the pipeline of fluid outlet (601) two sides, in the fluid
Third valve (702) and the 4th valve (703) are respectively equipped on the pipeline of entrance (701) two sides；
Control module is also used to control the first valve (602) according to the location information of piston (2) and the 4th valve (704) is opened,
Second valve (603) and third valve (702) are closed；Or control the second valve (603) and third valve (702) are opened, the
One valve (602) and the 4th valve (703) are closed.
4. a kind of piston-type flow-meter as described in claim 1, it is characterised in that: the valve is angle pedestal valve.
5. a kind of piston-type flow-meter as described in claim 1, it is characterised in that: further include being connected with the control module
Temperature sensor, temperature of the temperature sensor for signal piping or cylinder body (1) interior fluid；
The control module is also used to correct normal flow of its flow to obtain fluid according to the temperature value of fluid.
6. a kind of piston-type flow-meter as described in claim 1, it is characterised in that: further include being connected with the control module
Timing module, the timing module is for recording time of measuring；
The control module is also used to obtain being averaged in the time of measuring according to the flow in time of measuring and the time of measuring
Flow.
7. a kind of piston-type flow-meter as described in claim 1, it is characterised in that: the piston (2) include piston only, with
And it is sequentially arranged in the first sealing ring (201), the first air bag (204), the second sealing ring (202), second on piston only periphery
Air bag (205) and third sealing ring (203)；First air bag (204) is connected to the second air bag (205), and the first air bag
(204) and the outer diameter of the second air bag (205) is respectively less than the internal diameter of cylinder body (1).
8. a kind of piston-type flow-meter as claimed in claim 7, it is characterised in that: first sealing ring (201), second close
The quantity of seal (202) and third sealing ring (203) is at least one.
9. a kind of piston-type flow-meter as claimed in claim 7, it is characterised in that: in first sealing ring (201) and the
Piston only between three sealing rings (203) is equipped with groove (206).
10. a kind of piston-type flow-meter as described in claim 1, it is characterised in that: it further include turnover bracket (8), it is described to turn over
Turning bracket (8) includes support base (801) and outer framework (802)；The piston-type flow-meter is fixedly arranged in outer framework (802),
Outer framework (802) rotation is set on the bracket base (801).
11. a kind of piston-type flow-meter as claimed in claim 10, it is characterised in that: the support base (801) and outer
Positioning pin (803) are equipped between frame (802), are equipped with castor (808) on the outer framework (802).
12. a kind of method for carrying out flow measurement using any piston-type flow-meter of claim 1-11, which is characterized in that
Including the following steps:
The information of step (1) acquisition piston-initial-position；
Step (2) controls the opening and closing of corresponding valve according to the initial position message of piston, piston under the pressure of fluid by
Dynamic movement；
Step (3) obtains the location information of piston, goes out fluid flow according to the positional information calculation of piston.
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