CN110285860B - Piston type flowmeter and measuring method thereof - Google Patents
Piston type flowmeter and measuring method thereof Download PDFInfo
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- CN110285860B CN110285860B CN201910619570.1A CN201910619570A CN110285860B CN 110285860 B CN110285860 B CN 110285860B CN 201910619570 A CN201910619570 A CN 201910619570A CN 110285860 B CN110285860 B CN 110285860B
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- 238000000034 method Methods 0.000 title abstract description 7
- 239000012530 fluid Substances 0.000 claims abstract description 81
- 238000006073 displacement reaction Methods 0.000 claims abstract description 46
- 238000007789 sealing Methods 0.000 claims abstract description 29
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims description 6
- 230000007306 turnover Effects 0.000 claims description 5
- 230000033001 locomotion Effects 0.000 abstract description 15
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000002457 bidirectional effect Effects 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001595 flow curve Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000003068 static effect Effects 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 piston flowmeter and a measuring method thereof, and relates to the field of fluid flow measurement. The piston type flowmeter comprises a guide rod, a displacement sensor, at least two groups of pipelines, and valves and control modules which are correspondingly arranged on the pipelines; the guide rod is arranged in the cylinder body, and does not need to pass through a sealing cover at one end of the cylinder body, so that the problem of dynamic sealing caused by the guide rod is avoided, the occurrence of leakage accidents is avoided, and the maintenance workload is reduced; the fluid is controlled to enter or be discharged from the cylinder body by controlling the opening and closing of the corresponding valve, the movement pressure of the fluid drives the piston to move, and the piston can drive the guide rod to reciprocate along the displacement sensor, so that reciprocating bidirectional metering is realized, and the measuring work efficiency is improved; meanwhile, the fluid is actively moved, the piston is passively moved, and the structure such as a driving motor, a screw rod assembly, a heavy base and the like is omitted, so that the structure is simple, the volume and the weight of the flowmeter are greatly reduced, and the flowmeter can be carried to field work.
Description
Technical Field
The invention belongs to the field of fluid flow measurement, and particularly relates to a piston flowmeter and a measuring method thereof.
Background
The flow measuring device can conveniently measure the flow of liquid, the current flow measuring equipment has various types, the device for measuring the flow by driving the gear to rotate through the liquid flow is particularly arranged according to different principles, the flow measuring device also has the defect of measuring the flow of the fluid through the propagation speed change of ultrasonic waves, and the flow measuring device has the advantages of inaccurate measuring precision, complex equipment structure and high cost.
Although there is also a piston type displacement flow measuring device, a guide rod on a piston of the flow measuring device must pass through a sealing cover at one end of a cylinder body, and the adopted displacement device is an external device such as a ball screw, and the guide rod drives the ball screw to move. The external displacement sensor has high requirements on working environment, small workload and can not work for a long time. Meanwhile, the piston of the existing piston type displacement flow measuring device is a driving piston, and generally comprises a driving motor, a screw rod assembly, a cylinder body, a piston, a pipeline system, a signal generator and a computer control system. When the motor drives the screw rod assembly to rotate during operation, the piston is driven to do uniform linear motion along the axis of the cylinder body, fluid is discharged or sucked, the motion of the piston is active, and the motion of the fluid is passive. The driving piston has a complex structure, large volume and heavy weight, and the body of the driving piston is required to be placed on a heavy base, so that the weight of the driving piston is further increased, and the driving piston cannot be carried to field work. The driving piston is of a one-way structure generally, namely, only one-way metering can be realized during working, reciprocating two-way metering can not be realized, and the working efficiency is relatively low.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a piston flowmeter and a measuring method thereof, wherein the position of a piston in a cylinder body is detected through a built-in displacement sensor, and then the opening and closing of a corresponding valve are controlled according to the position of the piston, so that the piston can continuously reciprocate to continuously measure, and meanwhile, the correction of the fluid flow is realized according to the temperature of the fluid, so that the flow measuring precision is improved.
The invention solves the technical problems by the following technical scheme: a piston flow meter comprising:
the top of the cylinder body is provided with a guide groove which is communicated with the cylinder body;
a piston arranged in the cylinder body;
the guide rod is arranged on the piston, is arranged in the cylinder body and/or the guide groove, and is of an inner hollow structure;
one end of the displacement sensor is arranged at the top of the guide groove, and the other end of the displacement sensor extends to the inner hollow structure of the guide rod; the displacement sensor is used for detecting the position information of the piston;
one end of each group of pipelines is communicated with the top of the cylinder body, and the other end of each group of pipelines is communicated with the bottom of the cylinder body;
a fluid inlet and a fluid outlet which are arranged on each group of pipelines; the fluid inlet and the fluid outlet are fluid inlets or fluid outlets;
at least one valve which is arranged on the two side pipelines of the fluid inlet and outlet respectively;
exhaust valves arranged on each group of pipelines respectively;
the control module is used for calculating the flow of the fluid according to the position information of the piston and the calibrated indexing volume value; and the valve is used for controlling the valve to open and close according to the position information of the piston so as to drive the piston and the guide rod to reciprocate along the displacement sensor through the fluid pressure, thereby realizing the continuous measurement of the fluid in the cylinder body.
Further, the displacement sensor adopts a magnetostrictive displacement sensor, a magnetic ring of the magnetostrictive displacement sensor is arranged at the top of the guide rod, and a detection rod of the magnetostrictive displacement sensor penetrates through the magnetic ring and extends to an inner hollow structure of the guide rod.
Further, the pipeline comprises two groups, wherein the fluid inlet and the fluid outlet on one group of the pipelines are fluid inlets, and the fluid inlet and the fluid outlet on the other group of the pipelines are fluid outlets; the pipeline at two sides of the fluid outlet is respectively provided with a first valve and a second valve, and the pipeline at two sides of the fluid inlet is respectively provided with a third valve and a fourth valve;
the control module is also used for controlling the first valve and the fourth valve to be opened according to the position information of the piston, and the second valve and the third valve to be closed; or the second valve and the third valve are controlled to be opened, and the first valve and the fourth valve are controlled to be closed.
Furthermore, the valve is an angle seat valve, and the angle seat valve has the characteristics of sensitive response and accurate action.
Further, the piston flowmeter further comprises a temperature sensor connected with the control module, wherein the temperature sensor is used for detecting the temperature of the fluid in the pipeline or the cylinder body;
the control module is also used for correcting the flow of the fluid according to the temperature value of the fluid so as to obtain the standard flow of the fluid.
Further, the piston flowmeter further comprises a timing module connected with the control module, wherein the timing module is used for recording measurement time;
the control module is also used for obtaining the average flow in the measurement time according to the measurement time and the flow in the measurement time.
Further, the piston comprises a piston body, and a first sealing ring, a first air bag, a second sealing ring, a second air bag and a third sealing ring which are sequentially arranged on the periphery of the piston body; the first air bag is communicated with the second air bag, and the outer diameters of the first air bag and the second air bag are smaller than the inner diameter of the cylinder body.
Further, the number of the first sealing ring, the second sealing ring and the third sealing ring is at least one.
Further, a groove is formed in the piston body between the first sealing ring and the third sealing ring, and the groove is used for containing lubricating oil.
Further, the piston flowmeter further comprises a turnover bracket, wherein the turnover bracket comprises a supporting base and an outer frame; the piston flowmeter is fixedly arranged in the outer frame, and the outer frame is rotatably arranged on the support base.
The piston flowmeter is fixed in the outer frame, and the outer frame is rotationally arranged on the support base, so that the piston flowmeter can be overturned on the support base.
Further, a positioning pin is arranged between the supporting base and the outer frame, and casters are arranged on the outer frame.
The locating pin is used for fixing the piston flowmeter on the supporting base when the piston flowmeter is not overturned, and preventing the piston flowmeter from swinging on the supporting base. When the device does not work, the piston flowmeter with the outer frame can be detached from the supporting base, and the device is convenient to carry by pushing and moving through the truckles.
A method for flow measurement using the piston flow meter, comprising the steps of:
step (1) obtaining information of an initial position of a piston;
step (2) controlling the opening and closing of the corresponding valve according to the initial position information of the piston, wherein the piston passively moves under the fluid pressure;
and (3) acquiring the position information of the piston, and calculating the fluid flow according to the position information of the piston.
Advantageous effects
Compared with the prior art, the piston flowmeter comprises a guide rod, a displacement sensor, at least two groups of pipelines, valves and a control module, wherein the valves and the control module are correspondingly arranged on the pipelines; the guide rod is arranged in the cylinder body, and does not need to pass through a sealing cover at one end of the cylinder body, so that the problem of dynamic sealing caused by the guide rod is avoided, the occurrence of leakage accidents is avoided, and the maintenance workload is reduced; the displacement sensor is used for measuring the displacement of the piston, and extends to the inner hollow structure of the guide rod, so that the piston can be detected at any position without separating from the detection of the displacement sensor; according to the invention, the opening and closing of the corresponding valve are controlled to control the fluid to enter or be discharged from the cylinder body, the movement pressure of the fluid drives the piston to move, and the piston can drive the guide rod to reciprocate along the displacement sensor, so that reciprocating bidirectional metering is realized, and the measuring work efficiency is improved; meanwhile, the fluid is actively moved, the piston is passively moved, and the structure such as a driving motor, a screw rod assembly, a heavy base and the like is omitted, so that the structure is simple, the volume and the weight of the flowmeter are greatly reduced, and the flowmeter can be carried to field work.
The flowmeter also comprises a temperature sensor, and the flow of the fluid is corrected through the temperature of the fluid to obtain the standard flow, so that the accuracy of flow measurement is improved.
The piston comprises two communicated air bags, when the sealing ring at the outer side of one end of the piston leaks, the air bags at the end are pressed by fluid under pressure, so that the air bags at the other end swell to be in contact with the inner wall of the cylinder body, the inner leakage of the piston is obtained by increasing the movement resistance of the piston, and the problem that the inner leakage is difficult to find and judge in the prior art is solved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawing in the description below is only one embodiment of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a piston flow meter according to an embodiment of the present invention;
FIG. 2 is a schematic view of a piston according to an embodiment of the present invention;
FIG. 3 is a front view of an inverted bracket according to an embodiment of the present invention;
FIG. 4 is a side view of an inverted bracket according to an embodiment of the present invention;
FIG. 5 is an electrical connection diagram of a programmable controller in accordance with an embodiment of the invention;
FIG. 6 is an electrical connection diagram of a displacement sensor according to an embodiment of the present invention; the device comprises a 1-cylinder, a 101-guide groove, a 102-cylinder end cover, a 2-piston, a 201-first sealing ring, a 202-second sealing ring, a 203-third sealing ring, a 204-first air bag, a 205-second air bag, a 206-groove, a 207-air bag connecting pipe, a 3-guide rod, a 4-displacement sensor, a 401-magnetic ring, a 6-first pipeline, a 601-fluid outlet, a 602-first valve, a 603-second valve, a 604-first exhaust valve, a 7-second pipeline, a 701-fluid inlet, a 702-third valve, a 703-fourth valve, a 704-second exhaust valve, an 8-overturning bracket, a 801-supporting base, a 802-outer frame, 803-locating pins, a 804-rotating shaft, a 805-fixing clamping groove, a 806-connecting pull rod, 807-locating pins and 808-casters.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully by reference to the accompanying drawings, in which it is shown, however, only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the piston flowmeter provided by the invention comprises a cylinder body 1, a piston 2, a guide rod 3, a displacement sensor 4, a temperature sensor, two groups of pipelines and a control module. The top of the cylinder body 1 is provided with a guide groove 101 communicated with the cylinder body 1, the piston 2 is arranged in the cylinder body 1, the piston 2 is vertically provided with a guide rod 3, the guide rod 3 and the guide groove 101 are coaxially arranged, the guide rod 3 is positioned in the cylinder body 1 and the guide groove 101, and the guide rod 3 is of an inner hollow structure. The guide rod 3 of the flowmeter is positioned in the cylinder body 1, so that the problem of dynamic sealing does not exist, the occurrence of leakage accidents is reduced, and the maintenance workload is reduced. Cylinder end caps 102 are also provided at the top and bottom of the cylinder 1, respectively.
The two groups of pipelines comprise a first pipeline 6 and a second pipeline 7; one end of the first pipeline 6 is communicated with the top of the guide groove 101, the other end of the first pipeline 6 is communicated with the bottom of the cylinder body 1, a fluid outlet 601 is arranged on the first pipeline 6, and a first valve 602 and a second valve 603 are respectively arranged on pipelines on two sides of the fluid outlet 601. One end of the second pipeline 7 is communicated with the top of the cylinder body 1, the other end of the second pipeline 7 is communicated with the bottom of the cylinder body 1, a fluid inlet 701 is arranged on the second pipeline 7, and a third valve 702 and a fourth valve 703 are respectively arranged on pipelines on two sides of the fluid inlet 701. The first pipeline 6 and the second pipeline 7 are also respectively provided with a first exhaust valve 604 and a second exhaust valve 704 for exhausting the gas in the first pipeline 6 and the second pipeline 7.
One end of the displacement sensor 4 is arranged at the top of the guide groove 101, and the other end extends to the inner hollow structure of the guide rod 3, so that the piston 2 is ensured to have corresponding position detection data at any position without being separated from the control of the control module; a temperature sensor is provided at the fluid outlet 601. The displacement sensor 4, the temperature sensor, the first valve 602, the second valve 603, the third valve 702, the fourth valve 703 and the exhaust valve are all connected with the control module. The specific control process is as follows:
1. when the initial position of the piston 2 is the bottom of the cylinder body 1, the control module controls the fourth valve 703 and the first valve 602 to be opened according to the initial position information of the piston 2, the third valve 702 and the second valve 603 to be closed, and the piston 2 moves upwards under the fluid movement pressure to drive the guide rod 3 to move upwards along the displacement sensor 4; during the movement of the piston 2, the displacement sensor 4 sends out a pulse signal, and the control module calculates the instantaneous flow and the accumulated flow of the fluid according to the received pulse signal and the calibrated indexing volume value on the piston 2. The flowmeter can be used for calibrating a static volumetric water flow standard device, a water meter calibrating device and various liquid flowmeters.
The index volume refers to the volume or volume corresponding to a unit length. For example, a displacement sensor that moves a unit length (1 mm unit length in this embodiment) emits 100 pulses, and when 1000 pulses are received by the control module, this indicates that the piston has moved 10 units length, i.e., 10mm, thereby obtaining a volume of fluid with a flow rate equal to the volume/time.
2. When the initial position of the piston 2 is the top of the cylinder body 1, the control module controls the third valve 702 and the second valve 603 to be opened, the fourth valve 703 and the first valve 602 to be closed according to the initial position information of the piston 2, and the piston 2 moves downwards under the fluid movement pressure to drive the guide rod 3 to move downwards along the displacement sensor 4; during the movement of the piston 2, the displacement sensor 4 sends out a pulse signal, and the control module calculates the instantaneous flow and the accumulated flow of the fluid according to the received pulse signal and the calibrated indexing volume value on the piston 2.
The specific calculation formula of the instantaneous flow is as follows: q=n×f/t (1)
Where q represents the instantaneous flow, N represents the displacement of the piston movement or the number of accumulated pulses emitted by the displacement sensor, f represents the indexing capacity on the piston, and t represents the time of the piston movement.
The specific calculation formula of the accumulated flow is as follows: q=n×f (2)
The temperature sensor is used for detecting the temperature of the fluid, and correcting the flow according to the temperature of the fluid to obtain the standard flow, so that the flow measurement precision is improved, and the specific correction formula is as follows: q (Q) 20 =Q(1+β(20-T）） （3）
Wherein Q is 20 Representing the cumulative flow rate at 20 °, i.e., the standard cumulative flow rate; beta represents the expansion coefficient of the fluid and T represents the temperature of the fluid.
The flowmeter can enable the piston to continuously reciprocate through the control of the valve so as to realize continuous measurement of flow, the movement of the piston 2 is carried out by means of fluid pressure, the flowmeter is passive, a driving motor, a screw rod assembly and the like are not needed, and the volume and the weight of the flowmeter are greatly reduced. The displacement sensor 4 adopts a magnetostrictive displacement sensor, and the magnetic ring 401 and the detection rod 402 are not in direct contact, so that friction and abrasion are avoided, and therefore, the magnetic ring has the advantages of long service life, strong environment adaptability, high reliability, good safety and relatively high detection precision.
As shown in fig. 2, the piston 2 includes a piston body, and a first seal ring 201, a first air bag 204, a second seal ring 202, a second air bag 205, and a third seal ring 203 which are provided in this order on the outer periphery of the piston body; the first balloon 204 communicates with the second balloon 205 through balloon connection tube 207, and the outer diameters of both the first balloon 204 and the second balloon 205 are smaller than the inner diameter of the cylinder 1.
In this embodiment, the number of the first seal ring 201 and the third seal ring 203 is two, and the number of the second seal ring 202 is two, so that the piston 2 and the cylinder 1 are sealed by four seal rings. A groove 206 is formed on the piston body between the two second sealing rings 202, and the groove 206 is used for placing lubricating oil so as to lubricate between the cylinder 1 and the piston 2.
Under normal conditions, the air pressure between the first air bag 204 and the second air bag 205 is balanced, and the outer diameter of the air bags (namely the first air bag 204 and the second air bag 205) is smaller than the inner diameter of the cylinder 1, so that the air bags do not influence the normal movement of the piston 2; when the sealing ring at the outer side of one end of the piston 2 leaks, the pressurized fluid can reach the side air bag and press the side air bag, so that the air bag at the other side is inflated to be in contact with the inner wall of the cylinder body 1, the running resistance of the piston 2 is greatly increased, and the internal leakage can be judged through the instantaneous flow curve or the pressure change of the water inlet end.
For example, when the first seal ring 201 leaks, the first air bag 204 is pressed by the fluid, so that the second air bag 205 is inflated to be in contact with the inner wall of the cylinder 1; when the third sealing ring 203 leaks, the second air bag 205 is pressed by the fluid, so that the first air bag 204 is inflated to be in contact with the inner wall of the cylinder 1; both of these conditions will result in an increase in the running resistance of the piston 2 and thus a decrease in the instantaneous flow, so that the corresponding internal leakage can be judged from the instantaneous flow curve.
As shown in fig. 3 and 4, the piston type flowmeter further includes a flip bracket 8, and the flip bracket 8 includes a support base 801, an outer frame 802, a positioning pin 803, and casters 808; the cylinder body 1 of the piston flowmeter is fixed in the outer frame 802 through the fixing clamping groove 805, and because the cylinder body 1 is a cylinder in the embodiment, the two ends of the cylinder body 1 can be clamped through the fixing clamping grooves 805 at the two ends, so that the cylinder body 1 is conveniently fixed in the outer frame 802; the outer frame 802 is also provided with a connecting pull rod 806, and the connecting pull rod 806 connects the frames at two sides of the cylinder body 1, so that the whole outer frame 802 is firmer; a rotating shaft 804 is arranged on the outer frame 802, a clamping groove is arranged on the supporting base 801, the rotating shaft 804 is arranged in the clamping groove, and the position of the rotating shaft 804 is limited by a limiting pin 807, so that the rotating shaft 804 rotates in the clamping groove, and the piston flowmeter with the outer frame 802 rotates on the supporting base 801, so that the flowmeter can be turned over conveniently; meanwhile, a positioning pin 803 is arranged between the outer frame 802 and the support base 801, so that the piston flowmeter is fixed on the support base 801 when not turned over, and is prevented from swinging on the support base 801 during working. The side of the outer frame 802 is also provided with casters 808, the limiting pins 807 and the positioning pins 803 are pulled out, and the rotating shaft 804 is taken out from the clamping groove, so that the flowmeter with the outer frame 802 is taken out from the supporting base 801, and the movement of the flowmeter can be realized through the casters 808, so that the flowmeter is convenient to carry and carry.
As shown in fig. 5 and 6, the electric control part of the invention is provided with 24V power by a switching power supply U1 with the model of MDR-60-24, the control module adopts a programmable logic controller U2 with the model of PLC, and the programmable logic controller U2 is connected with an analog function expansion board U3, a communication module U4, a touch screen and coils (KM 1-KM4 in fig. 3) of four intermediate relays; and the normally open contacts of the four intermediate relays are respectively connected with the first valve, the second valve, the third valve and the fourth valve, and when the PLC U2 outputs high level or low level, the normally open contacts of the corresponding intermediate relays are closed or opened to control the corresponding valves to be opened or closed. The displacement sensor TH1 is connected with the communication module U4 through the SSI communication module U6 and the CC-Link network adapter U5, so that remote transmission of measurement data can be realized. The analog function expansion board U3 is used for acquiring analog data, and the touch screen is used for setting parameters and displaying measurement results.
In this embodiment, the selection of each module is specifically: the model of the PLC U2 is FX3G-14MT, the model of the analog function expansion board U3 is FX3G-2AD-BD, the model of the communication module U4 is FX3U-16CCL-M, the model of the touch screen is GT2103-PMBD, the model of the intermediate relay is RJ2S-CL-D24, the model of the displacement sensor TH1 is TH1-0425-102-225-102, the model of the SSI communication module U6 is ST5351, and the model of the CC-Link network adapter U5 is NA9131. In order to match the communication protocol of the displacement sensor TH1 to set the SSI communication module U6 and the CC-Link network adapter U5, the position data acquired by the displacement sensor are directly transmitted to the PLC, so that the acquisition accuracy of the position data is improved.
The foregoing disclosure is merely illustrative of specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art will readily recognize that changes and modifications are possible within the scope of the present invention.
Claims (10)
1. A piston flow meter, comprising:
a cylinder body (1) with a guide groove (101) at the top, wherein the guide groove (101) is communicated with the cylinder body (1);
a piston (2) provided in the cylinder (1); the piston (2) comprises a piston body, and a first sealing ring (201), a first air bag (204), a second sealing ring (202), a second air bag (205) and a third sealing ring (203) which are sequentially arranged on the periphery of the piston body; the first air bag (204) is communicated with the second air bag (205), and the outer diameters of the first air bag (204) and the second air bag (205) are smaller than the inner diameter of the cylinder body (1);
the guide rod (3) is arranged on the piston (2), and the guide rod (3) is arranged in the cylinder body (1) and/or the guide groove (101) and is of an inner hollow structure;
the displacement sensor (4) is arranged at the top of the guide groove (101), and the other end of the displacement sensor (4) extends to the inner hollow structure of the guide rod (3); the displacement sensor (4) is used for detecting the position information of the piston (2);
one end of each group of pipelines is communicated with the top of the cylinder body (1), and the other end of each group of pipelines is communicated with the bottom of the cylinder body (1);
a fluid inlet and a fluid outlet which are arranged on each group of pipelines; the fluid inlet and outlet are a fluid inlet (701) or a fluid outlet (601);
at least one valve which is arranged on the two side pipelines of the fluid inlet and outlet respectively;
exhaust valves arranged on each group of pipelines respectively;
the control module is used for calculating the flow of the fluid according to the position information of the piston (2) and the calibrated indexing volume value; and the valve is used for controlling the opening and closing of the valve according to the position information of the piston (2) so as to drive the piston (2) and the guide rod (3) to reciprocate along the displacement sensor (4) through the fluid pressure, thereby realizing the continuous measurement of the fluid in the cylinder body (1).
2. A piston flow meter as claimed in claim 1, wherein: the displacement sensor (4) adopts a magnetostrictive displacement sensor, a magnetic ring (401) of the magnetostrictive displacement sensor is arranged at the top of the guide rod (3), and a detection rod (402) of the magnetostrictive displacement sensor penetrates through the magnetic ring (401) and extends to an inner hollow structure of the guide rod (3).
3. A piston flow meter as claimed in claim 1, wherein: the pipeline comprises two groups, wherein the fluid inlet and the fluid outlet on one group of pipeline are fluid inlets (701), and the fluid inlet and the fluid outlet on the other group of pipeline are fluid outlets (601); a first valve (602) and a second valve (603) are respectively arranged on the pipelines at two sides of the fluid outlet (601), and a third valve (702) and a fourth valve (703) are respectively arranged on the pipelines at two sides of the fluid inlet (701);
the control module is also used for controlling the first valve (602) and the fourth valve (704) to be opened and the second valve (603) and the third valve (702) to be closed according to the position information of the piston (2); or the second valve (603) and the third valve (702) are controlled to be opened, and the first valve (602) and the fourth valve (703) are controlled to be closed.
4. A piston flow meter as claimed in claim 1, wherein: the valve is a corner seat valve.
5. A piston flow meter as claimed in claim 1, wherein: the device also comprises a temperature sensor connected with the control module, wherein the temperature sensor is used for detecting the temperature of the fluid in the pipeline or the cylinder body (1);
the control module is also used for correcting the flow of the fluid according to the temperature value of the fluid so as to obtain the standard flow of the fluid.
6. A piston flow meter as claimed in claim 1, wherein: the system also comprises a timing module connected with the control module, wherein the timing module is used for recording measurement time;
the control module is also used for obtaining the average flow in the measurement time according to the measurement time and the flow in the measurement time.
7. A piston flow meter as claimed in claim 1, wherein: the number of the first sealing ring (201), the second sealing ring (202) and the third sealing ring (203) is at least one.
8. A piston flow meter as claimed in claim 1, wherein: a groove (206) is arranged on the piston body between the first sealing ring (201) and the third sealing ring (203).
9. A piston flow meter as claimed in claim 1, wherein: the turnover device also comprises a turnover bracket (8), wherein the turnover bracket (8) comprises a support base (801) and an outer frame (802); the piston flowmeter is fixedly arranged in the outer frame (802), and the outer frame (802) is rotatably arranged on the bracket base (801).
10. A piston flow meter as claimed in claim 9, wherein: a positioning pin (803) is arranged between the supporting base (801) and the outer frame (802), and casters (808) are arranged on the outer frame (802).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910619570.1A CN110285860B (en) | 2019-07-10 | 2019-07-10 | Piston type flowmeter and measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910619570.1A CN110285860B (en) | 2019-07-10 | 2019-07-10 | Piston type flowmeter and measuring method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110285860A CN110285860A (en) | 2019-09-27 |
| CN110285860B true CN110285860B (en) | 2024-04-16 |
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| CN112923983B (en) * | 2019-12-06 | 2024-05-03 | 宝武装备智能科技有限公司 | Device for detecting pipeline flow of dry oil centralized lubrication system |
| CN111157069A (en) * | 2019-12-31 | 2020-05-15 | 浙江大学 | Gas flow continuous measuring device and flow measuring method |
| CN112539787B (en) * | 2020-11-25 | 2024-01-30 | 浙江威盾机械科技有限公司 | Flowmeter for measuring flow rate |
| CN113324607B (en) * | 2021-05-27 | 2022-03-25 | 浙江工业大学 | Two-dimensional piston type dynamic flow meter |
| CN117490786B (en) * | 2023-12-29 | 2024-03-12 | 四川省农业机械科学研究院 | Flow detection alarm device of pneumatic conveying type corn planter |
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