CN111366206A - Movable guide rail type flowmeter - Google Patents

Movable guide rail type flowmeter Download PDF

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Publication number
CN111366206A
CN111366206A CN201811599460.5A CN201811599460A CN111366206A CN 111366206 A CN111366206 A CN 111366206A CN 201811599460 A CN201811599460 A CN 201811599460A CN 111366206 A CN111366206 A CN 111366206A
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CN
China
Prior art keywords
axial
window
piston
metering unit
shell
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Pending
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CN201811599460.5A
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Chinese (zh)
Inventor
丁川
朱宇辉
阮健
童成伟
吴圣
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Priority to CN201811599460.5A priority Critical patent/CN111366206A/en
Publication of CN111366206A publication Critical patent/CN111366206A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/10—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation
    • G01F11/12—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements
    • G01F11/20—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements wherein the measuring chamber rotates or oscillates
    • G01F11/22—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements wherein the measuring chamber rotates or oscillates for liquid or semiliquid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The invention discloses a movable guide rail type flowmeter, which comprises a left shell and a right shell, wherein the left shell and the right shell are hermetically communicated through a middle shell; the measured fluid flow channel is separated from the moving part through a sealing component; the outer wall of the middle shell is provided with a Hall element, magnetic steel which is induced with the Hall element is arranged in the middle shell, and the central processing unit receives a pulse electric signal sent by the Hall element and calculates the flow according to the pulse electric signal. The invention solves the problem of overlarge pressure drop of the inlet and the outlet of the existing volumetric flowmeter, and realizes the beneficial effects of reducing the pressure drop of the inlet and the outlet of the flowmeter, smoothening the flow pulsation of the liquid outlet, reducing the internal leakage of the flowmeter, improving the measurement precision and reducing the volume of the flowmeter.

Description

Movable guide rail type flowmeter
Technical Field
The invention relates to a flowmeter, in particular to a movable guide rail type flowmeter.
Background
In the flow measurement field, the volumetric flowmeter has higher measurement accuracy and is less influenced by the environment, so that the volumetric flowmeter is widely applied to the fields of aerospace ships, chemical engineering, mechanical and electrical integration and the like. The piston type flowmeter is one of volumetric flowmeters, and is divided into a reciprocating piston type flowmeter and a rotary piston type flowmeter.
The reciprocating piston type flowmeter has high metering precision and is commonly used in automobile gas stations, but if only a single reciprocating piston is used for flow metering, the flow pulsation problem exists, and the current method for smoothing flow pulsation is to use a multi-piston flowmeter, but the measured fluid needs to push a plurality of pistons to move, more fluid kinetic energy is consumed, so that the pressure drop of the measured liquid before and after the flowmeter is overlarge, and the volume of the flowmeter is overlarge.
When the measured flow of the rotary piston type flowmeter is overlarge, the rotating speed of an internal rotor is too high, and the consumed kinetic energy is too much, so that the front and back measured liquid pressure of the flowmeter is also overlarge; and because of the metering principle of the positive displacement flowmeter, the rotary piston flowmeter still has the problem of large flow pulsation.
Disclosure of Invention
The embodiment of the application provides a movable guide rail type flowmeter to solve the too big problem of exit pressure drop that current positive displacement flowmeter exists, realized having reduced the pressure drop of flowmeter exit, having leveled liquid outlet flow pulsation, having reduced the beneficial effect that the internal leakage of flowmeter, improved measurement accuracy and reduced the flowmeter volume.
The technical scheme adopted by the invention is as follows:
the embodiment of the application provides a movable guide rail type flowmeter, which comprises a left shell and a right shell, wherein the left shell and the right shell are communicated in a sealing way through a middle shell, and the central axes of the left shell, the right shell and the middle shell are coincided; the left end of the left shell is provided with a left end cover, the right end of the right shell is provided with a right end cover, the left end cover is provided with a liquid inlet, and the right end cover is provided with a liquid outlet; defining one end of the left shell as a left end, one end of the right shell as a right end, wherein the axial direction is the direction of the central shaft or the direction parallel to the central shaft, the axial symmetry refers to the symmetry with the central shaft, the radial direction refers to the direction of the diameter of the cross section of the middle shell, and the circumferential direction is the direction around the central shaft;
a left metering unit is arranged in the left shell, a right metering unit is arranged in the right shell, the left shell is used for feeding liquid and discharging liquid through the left metering unit, and the right shell is used for feeding liquid and discharging liquid through the right metering unit;
the left metering unit comprises a left cylinder body coaxially arranged in the left shell, and the right metering unit comprises a right cylinder body coaxially arranged in the right shell; a left piston is coaxially arranged in the left cylinder body, a right piston is coaxially arranged in the right cylinder body, the left piston and the right piston are connected through a shifting fork sliding rod device which allows the left piston and the right piston to keep synchronous rotation and relatively independently axially move, and the shifting fork sliding rod device is arranged in an inner cavity of the middle shell;
the left end and the right end of the left piston hermetically penetrate through the left cylinder body, a first shoulder is arranged in the middle of the left piston, and the first shoulder divides an inner cavity of the left cylinder body into a first closed left cavity and a first closed right cavity; the first shoulder is provided with two axisymmetric first left axial grooves and two axisymmetric first right axial grooves, and the first left axial grooves and the first right axial grooves are alternately arranged on the circumference of the cross section of the left piston at equal intervals, wherein: the first left axial slot is in communication with the first left chamber and the first right axial slot is in communication with the first right chamber;
the left end and the right end of the right piston hermetically penetrate through the right cylinder body, a second shoulder is arranged in the middle of the right piston, and the second shoulder divides the inner cavity of the right cylinder body into a closed second left cavity and a closed second right cavity; the second shoulder is provided with two axisymmetric second left axial grooves and two axisymmetric second right axial grooves, and the second left axial grooves and the second right axial grooves are alternately arranged on the circumference of the cross section of the right piston at equal intervals, wherein: the second left axial slot is communicated with a second left chamber, and the second right axial slot is communicated with a second right chamber;
the left metering unit further comprises a pair of roller motion assemblies respectively positioned at the left end and the right end of the left metering unit, and the right metering unit further comprises another pair of roller motion assemblies respectively positioned at the left end and the right end of the right metering unit; the roller motion assemblies comprise rollers and guide rails which are matched with each other;
the left and right ends of the left cylinder body are respectively provided with two axisymmetric hollow roller shafts, and the left and right ends of the right cylinder body are also respectively provided with two axisymmetric hollow roller shafts, wherein: the inner ends of the hollow roller shafts of the left metering unit are respectively fixed on the outer wall of the left cylinder body, and the outer ends of the hollow roller shafts of the left metering unit extend along the radial direction to be fixedly connected with the inner wall of the left shell; the inner end of the hollow roller shaft of the right metering unit is fixed on the outer wall of the right cylinder body, and the outer end of the hollow roller shaft of the right metering unit radially extends to be fixedly connected with the inner wall of the right shell; the rollers of the left metering unit and the rollers of the right metering unit are sleeved on the hollow roller shafts in a one-to-one rotatable manner;
the guide rails of the left metering unit are respectively and coaxially fixed at the left end and the right end of the left piston outside the left cylinder body, and the guide rails of the right metering unit are respectively and coaxially fixed at the left end and the right end of the right piston outside the right cylinder body;
the rolling surfaces of the guide rail of the left metering unit and the guide rail of the right metering unit are both axial annular curved surfaces, the curved surfaces are provided with axial fluctuation, the projection of the guide rail in the direction of the central shaft is annular, the curved surfaces are provided with 2 highest points and 2 lowest points, the highest points and the lowest points are respectively positioned on two mutually vertical diameters of the annular, and the curved surfaces are respectively symmetrical according to the two diameters; the rollers roll on the corresponding rolling surfaces of the guide rails and push the left piston and the right piston to move along the axial direction; the inner ring side of the guide rail is higher than the outer ring side, the roller is a conical roller, and the rolling surface of the roller is matched with the rolling surface of the guide rail;
two left axial through holes and two left axial blind holes are formed in the wall surface of the left shell, and projections of the left axial through holes and the left axial blind holes on the cross section of the left shell are alternately distributed at equal intervals along the circumference of the left shell; the left axial through hole is provided with a left first window, and the left axial blind hole is provided with a left second window;
two right axial through holes and two right axial blind holes are formed in the wall surface of the right shell, and the projections of the right axial through holes and the right axial blind holes on the cross section of the right shell are alternately distributed at equal intervals along the circumference of the right shell; a right first window is formed in the right axial through hole, and a right second window is formed in the right axial blind hole;
the middle shell is provided with a pair of first axial connecting through holes which are respectively used for communicating the left axial blind hole and the right axial through hole, and the middle shell is also provided with a pair of second axial connecting through holes which are respectively used for communicating the left axial through hole and the right axial blind hole;
the left cylinder body is provided with two axisymmetric left third windows communicated with the first left axial groove or the first right axial groove, and the left cylinder body is also provided with two axisymmetric left fourth windows communicated with the first left axial groove or the first right axial groove; and the projections of the left third window and the left fourth window on the cross section of the left cylinder body are alternately distributed at equal intervals along the circumference of the left cylinder body;
the right cylinder body is provided with two axisymmetric right third windows communicated with the second left axial groove or the second right axial groove, and the right cylinder body is also provided with two axisymmetric right fourth windows communicated with the second left axial groove or the second right axial groove; the projections of the right third window and the right fourth window on the cross section of the right cylinder body are alternately distributed at equal intervals along the circumference of the right cylinder body; the hollow roller shaft is communicated along the radial direction, the inner end of the hollow roller shaft at the left end of the left metering unit is communicated with the left third window, and the outer end of the hollow roller shaft at the left end of the left metering unit is communicated with the left first window; the inner end of the hollow roller shaft at the right end of the left metering unit is communicated with the left fourth window, and the outer end of the hollow roller shaft at the right end of the left metering unit is communicated with the left second window;
the inner end of the hollow roller shaft at the left end of the right metering unit is communicated with the right third window, and the outer end of the hollow roller shaft at the left end of the right metering unit is communicated with the right first window; the inner end of the hollow roller shaft at the right end of the right metering unit is communicated with the right fourth window, and the outer end of the hollow roller shaft at the right end of the right metering unit is communicated with the right second window;
the liquid inlet, the left axial through hole, the left first window, the hollow roller shaft positioned at the left end of the left metering unit and the left third window are communicated in sequence to form a liquid inlet channel of the left metering unit; the left fourth window, the hollow roller shaft positioned at the right end of the left metering unit, the left second window, the left axial blind hole, the first axial connecting through hole, the right axial through hole and the liquid outlet are communicated in sequence to form a liquid outlet channel of the left metering unit;
the liquid inlet, the left axial through hole, the second axial connecting through hole, the right axial blind hole, the right second window, the hollow roller shaft positioned at the right end of the right metering unit and the right fourth window are communicated in sequence to form a liquid inlet channel of the right metering unit; the right third window, the hollow roller shaft positioned at the left end of the right metering unit, the right first window, the right axial through hole and the liquid outlet are communicated in sequence to form a liquid outlet channel of the right metering unit;
the waveshapes of the curved surfaces of the guide rails positioned at the two ends of the left piston are in phase; the waveshapes of the curved surfaces of the guide rails positioned at the two ends of the right piston are in phase with each other;
the left metering unit and the right metering unit are arranged along the circumferential direction in a staggered mode of 45 degrees, namely: the left piston and the right piston are arranged in a staggered mode at an angle of 45 degrees along the circumferential direction, and the phase difference of the curved surface waveforms of the corresponding guide rails on the left piston and the right piston is 45 degrees;
the shifting fork sliding rod device comprises a shifting fork and a sliding rod, the shifting fork is fixed on a guide rail at the left end of the right piston, and the sliding rod is fixedly arranged on a guide rail at the right end of the left piston; fork openings which are opened leftwards along the axial direction are formed in the two sides of the shifting fork, the sliding rod is arranged in the radial direction, the fork openings of the shifting fork are clamped and sleeved on the sliding rod, the sliding rod can slide along the fork openings of the shifting fork, and the shifting fork and the sliding rod can synchronously move along the axial direction and can also rotate along the circumferential direction;
a Hall element is arranged on the outer wall of the middle shell, magnetic steel which is induced with the Hall element is arranged in the middle shell, and the central processing unit receives a pulse electric signal sent by the Hall element and calculates the flow according to the pulse electric signal;
the positions of the first left axial groove, the first right axial groove, the second left axial groove, the second right axial groove, the left first window, the left second window, the left third window, the left fourth window, the right first window, the right second window, the right third window, and the right fourth window have the following corresponding relations:
in a first state:
in the right metering unit, the measured liquid pushes the right piston to move rightwards along the axial direction, and the right piston is forced to rotate downwards along the circumferential direction by a roller motion assembly on the right piston; the second left axial slot is aligned with the right fourth window, and the second right axial slot is aligned with the right third window; the second left chamber is communicated with the liquid inlet channel of the right metering unit and the second left groove to feed liquid, and the second right chamber is communicated with the liquid outlet channel of the right metering unit and the liquid outlet channel to discharge liquid;
in the left metering unit, the left piston is driven by the right piston to rotate along the circumferential direction, and the left piston is forced to move leftwards along the axial direction by a roller motion assembly on the left piston; the first left axial groove is not communicated with the left third window and the left fourth window, and the first right axial groove is not communicated with the left third window and the left fourth window; the first left chamber is neither liquid nor liquid, and the first right chamber is neither liquid nor liquid;
in the second state:
in the left metering unit, the tested liquid pushes the left piston to move leftwards along the axial direction, and the left piston rotates along the circumferential direction under the force of a roller motion assembly on the left piston; the first left axial slot is aligned with the left fourth window and the first right axial slot is aligned with the left third window; the first right chamber is communicated with the liquid inlet channel of the left metering unit and the first right groove to feed liquid, and the first left chamber is communicated with the liquid outlet channel of the left metering unit to discharge liquid;
in the right metering unit, the right piston is driven by the left piston to rotate along the circumferential direction, and the right piston is forced by a roller motion assembly on the right piston to move leftwards along the axial direction; the second left axial groove is not communicated with the right third window and the right fourth window, and the second right axial groove is not communicated with the right third window and the right fourth window; the second left chamber is neither liquid nor liquid, and the second right chamber is neither liquid nor liquid;
in the third state:
in the right metering unit, the measured liquid pushes the right piston to move leftwards along the axial direction, and the right piston is forced to move downwards along the circumferential direction by a roller motion assembly on the right piston; the second left axial slot is aligned with the right third window, and the second right axial slot is aligned with the right fourth window; the second right chamber is communicated with the liquid inlet channel of the right metering unit and the second right groove to feed liquid, and the second left chamber is communicated with the liquid outlet channel of the right metering unit and the liquid outlet channel of the left metering unit to discharge liquid;
in the left metering unit, the left piston is driven by the right piston to rotate along the circumferential direction, and the left piston is forced by a roller motion assembly on the left piston to move rightwards along the axial direction; the first left axial groove is not communicated with the left third window and the left fourth window, and the first right axial groove is not communicated with the left third window and the left fourth window; the first left chamber is neither liquid nor liquid, and the first right chamber is neither liquid nor liquid;
in the fourth state:
in the left metering unit, the tested liquid pushes the left piston to move rightwards, and the left piston is forced to rotate along the circumferential direction by a roller motion assembly on the left piston; the first left axial slot is aligned with the left third window and the first right axial slot is aligned with the left fourth window; the first left chamber is communicated with the liquid inlet channel of the left metering unit and the first left groove to feed liquid, and the first right chamber is communicated with the liquid outlet channel of the left metering unit and the liquid outlet channel of the right metering unit to discharge liquid;
in the right metering unit, the right piston is driven by the left piston to rotate along the circumferential direction, and the right piston is forced by a roller motion assembly on the right piston to move rightwards along the axial direction; the second left axial groove is not communicated with the right third window and the right fourth window, and the second right axial groove is not communicated with the right third window and the right fourth window; the second left chamber is neither fed nor discharged, and the second right chamber is neither fed nor discharged.
First sealing components are respectively arranged between the two ends of the first axial connecting through hole and the left axial blind hole and the right axial through hole; second sealing components are arranged between the two ends of the second axial connecting through hole and the left axial through hole and the right axial blind hole respectively;
the hollow roller shaft and the left shell or the right shell are fixedly connected through bolts and the like, and third sealing components are arranged between the hollow roller shaft and the left shell or the right shell respectively.
Further, the first seal member, the second seal member, and the third seal member are seal rings. .
Further, the left shell and the right shell are fixedly connected with the middle shell through bolts respectively.
Further, the left end cover and the left shell, and the right end cover and the right shell are fixed through bolts respectively.
Further, the roller is rotatably disposed on the hollow roller shaft through a bearing.
Further, the widths of the left first window, the left second window, the left third window, the left fourth window, the right first window, the right second window, the right third window, the right fourth window, the first left axial groove, the first right axial groove, the second left axial groove and the second right axial groove along the circumferential direction are the same; and the radian of the left third window, the left fourth window, the right third window, the right fourth window, the first left axial groove, the first right axial groove, the second left axial groove and the second right axial groove along the circumferential direction is 45 degrees.
Further, two communicate through left first radial spread groove between the first left axial groove, two communicate through left second radial spread groove between the first right axial groove, just left side first radial spread groove with left side second radial spread groove all follows radial interval sets up in the left side piston.
Further, two communicate through right first radial spread groove between the left axial groove of second, two communicate through right second radial spread groove between the right axial groove of second, just right first radial spread groove with right second radial spread groove all follows radial interval sets up in the right piston.
Furthermore, the sliding rod is coaxially and rotatably sleeved with a rolling body, and a fork opening of the shifting fork is connected with the sliding rod through the rolling body.
The invention has the beneficial effects that:
1. the guide rail links firmly with left piston or right piston for the guide rail becomes moving part, compare with regard to the gyro wheel as moving part among the prior art, because of the guide rail is the ring form, the resistance that regular shape can significantly reduce to stir and give moving part itself because of moving part in liquid, thereby reduced the kinetic energy of being surveyed the fluid because of promoting the moving part motion and loss, so the loss of pressure of being surveyed liquid is littleer in the measurement process, thereby be of value to solve the too big problem of exit pressure drop that current positive displacement flowmeter exists.
2. The liquid inlet channel of the left metering unit, the first left chamber, the first right chamber, the liquid outlet channel of the left metering unit, the liquid inlet channel of the right metering unit, the second left chamber, the second right chamber and the liquid outlet channel of the right metering unit are independent from each other and are not in series flow with each other, so that the measured liquid is isolated from moving parts such as guide rails and rollers, the stirring of the moving parts of the flow meter in the measured fluid in the metering process is avoided, the kinetic energy lost in the flow field of the measured fluid when passing through the flow meter is smaller, the interference is smaller, and the problems of overlarge inlet and outlet pressure drop and overlarge flow pulsation existing in the conventional positive displacement flow meter are favorably solved.
3. The left first radial connecting groove is communicated with the two first left axial grooves, and the two first left axial grooves flow after being converged through the left first radial connecting groove, so that the flow field of the liquid to be measured is more stable; in the same way, the arrangement of the left second radial connecting groove, the right first radial connecting groove and the right second radial connecting groove also enables the flow field of the liquid to be measured to be more stable, reduces the pressure loss between the inlet and the outlet of the measured liquid, and is beneficial to solving the problem that the pressure drop of the inlet and the outlet of the existing positive displacement flowmeter is overlarge.
4. Through setting up the rolling element the shift fork with for rolling friction between the litter, frictional resistance reduces, has reduced the shift fork with frictional force between the litter can effectively reduce the pressure drop of being surveyed liquid to be of value to solve the too big problem of exit pressure drop that current positive displacement flowmeter exists.
5. The first sealing member, the second sealing member and the third sealing member ensure that the liquid inlet channel of the left metering unit and the liquid inlet channel of the right metering unit are independent from the liquid outlet channel of the left metering unit and the liquid outlet channel of the right metering unit, so that liquid flow does not occur between the liquid inlet channels and the liquid outlet channels, and a measured fluid is not in direct contact with the roller guide rail assembly, so that the pressure loss of the measured liquid in the flowmeter is effectively reduced, and the problem of overlarge pressure drop of an inlet and an outlet of the conventional volumetric flowmeter is favorably solved; while allowing internal leakage of the flow meter to be reduced.
6. The flow meter adopts a duplex structure of linkage of the left metering unit and the right metering unit, and a circumferential corner phase difference of 45 degrees exists between the front duplex and the back duplex, so that the flow of the measured fluid discharged by the left metering unit and the right metering unit of the flow meter can be completely eliminated in theory after being superposed, and meanwhile, the rotation direction of a piston of the flow meter can be kept unchanged, thereby being beneficial to solving the problem of large flow pulsation of a liquid outlet of a volumetric flow meter in the prior art and being beneficial to the measurement accuracy of the invention.
7. The guide rail is fixedly connected with the left piston or the right piston, so that the guide rail becomes a moving part, compared with the prior art in which the roller is used as the moving part, the guide rail is in a circular ring shape, when the measured fluid needs to be in contact with the moving part, the obtained flow field can be more stable, the kinetic energy loss of the flow field per se can be less, and the problem of increased leakage in the flow meter caused by the larger pressure difference between the inlet and the outlet of the flow meter in the prior art is favorably solved.
8. The first shoulder on the left piston is in clearance seal with the inner wall surface of the left cylinder body, so that fluid flow between the first left cavity and the first right cavity can be prevented, the second shoulder on the right piston is in clearance seal with the inner wall surface of the right cylinder body, so that fluid flow between the second left cavity and the second right cavity can be prevented, and internal leakage of the flowmeter is effectively reduced.
9. The hollow roller shaft is communicated along the radial direction, the hollow roller shaft plays a role of serving as a roller shaft and a flow channel at the same time, and the hollow roller shaft is fixedly communicated with the left shell and the left cylinder body or the right shell and the right cylinder body, so that the structure is simpler and more compact, and the volume of the flowmeter is reduced.
10. The shaft, the piston and the guide rail are integrated, the structure is simplified, the two-degree-of-freedom structure of axial sliding and circumferential rotation of the left piston and the right piston is used for replacing the traditional single-degree-of-freedom piston structure, continuous metering and bidirectional metering are realized, and the volume of the flowmeter is greatly reduced.
11. The two pistons complete two reciprocating motions under the condition of rotating for 360 degrees for a circle, four measured liquids with unit volumes can be discharged, and compared with a traditional four-piston flowmeter, the four-piston flowmeter is smaller in volume and higher in precision under the condition that the maximum metering flow value is the same.
12. The shape of the guide rail enables the left piston or the right piston to meet the law of deceleration motion such as axial equal acceleration, namely in each motion interval, in the front half section of the interval, the left piston or the right piston accelerates with the same acceleration, and in the back half section of the interval, the left piston or the right piston decelerates with the same deceleration, so that the left piston or the right piston moves leftwards and rightwards with the same acceleration curve, and the axial motion of the piston is clear and controllable.
13. The Hall element-magnetic steel is used as an acquisition mode of the pulse signal, so that the method can better measure under a high-voltage condition, and has stronger practicability and wider adaptability.
Drawings
FIG. 1 is a 90 cross-sectional view of the present invention in one embodiment;
FIG. 2 is a cross-sectional view of the left housing and the left metering unit in one embodiment;
FIG. 3 is a cross-sectional view of the right housing and the right metering unit in one embodiment;
FIG. 4a is a schematic view of the left cylinder and its left hollow roller shaft and roller in one embodiment;
FIG. 4b is a schematic view of the right cylinder and its hollow roller shaft and roller at the right end of the embodiment;
FIG. 5 is a cross-sectional view of a roller and hollow roller shaft according to one embodiment;
FIG. 6a is a schematic cross-sectional view of an embodiment of a left piston without a first left radial connecting groove and a second left radial connecting groove;
FIG. 6b is a cross-sectional view taken along line S1-S1 of FIG. 6 a;
FIG. 7a is a schematic cross-sectional view of an embodiment of a left piston having a first left radial connecting groove and a second left radial connecting groove;
FIG. 7b is a cross-sectional view taken along line S2-S2 of FIG. 7 a;
FIG. 8a is a schematic cross-sectional view of a right piston without a right first radial connecting groove and a right second radial connecting groove in one embodiment;
FIG. 8b is a cross-sectional view taken along lines S3-S3 of FIG. 8 a;
FIG. 9a is a schematic cross-sectional view of an embodiment of a right piston having a right first radial connecting groove and a right second radial connecting groove formed therein;
FIG. 9b is a cross-sectional view taken along lines S4-S4 of FIG. 9 a;
FIG. 10a is a schematic view of a track with a slide rod according to an embodiment;
FIG. 10b is a schematic view of a slide bar with rolling bodies in one embodiment;
FIG. 11 is a schematic view of the fork according to an embodiment;
FIG. 12 is a schematic view of a fork slide engaging structure according to an embodiment;
FIG. 13 is a schematic view of a guide rail configuration according to an embodiment;
FIG. 14a is a schematic cross-sectional view of an intermediate housing in one embodiment;
FIG. 14b is a cross-sectional view taken along line S5-S5 of FIG. 14 a;
FIG. 15 is a schematic cross-sectional view of the left or right housing in one embodiment;
FIG. 16a is a cross-sectional view of the present invention taken along line V-V of FIG. 15 with the left piston at either 0 or 180 for one embodiment;
FIG. 16b is a cross-sectional view of the present invention taken along line W-W of FIG. 15 with the left piston at either 0 or 180 for one embodiment;
FIG. 17a is a cross-sectional view of the invention taken along line V-V in FIG. 15 with the left piston at 45 ° in one embodiment;
FIG. 17b is a cross-sectional view of the invention taken along line W-W in FIG. 15 with the left piston at 45 ° in one embodiment;
FIG. 18a is a cross-sectional view of the invention taken along line V-V in FIG. 15 with the left piston at 90 ° in one embodiment;
FIG. 18b is a cross-sectional view of the invention taken along line W-W in FIG. 15 with the left piston at 90 ° in one embodiment;
FIG. 19a is a cross-sectional view of the invention taken along line V-V in FIG. 15 with the left piston at 135 ° in one embodiment;
FIG. 19b is a cross-sectional view of the invention taken along the line W-W in FIG. 15 with the left piston at 135 ° in one embodiment.
FIG. 20 is a graphical representation of the position of the left piston and the right piston in one embodiment.
FIG. 21 is a graph illustrating the discharge flow of the left piston and the right piston and the flow superimposed on each other in one embodiment.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the orientations or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 21, the present embodiment provides an active guide type flowmeter, including a left casing 3 and a right casing 13, where the left casing 3 and the right casing 13 are hermetically communicated through a middle casing 8, and central axes of the left casing 3, the right casing 13 and the middle casing 8 are coincident; a left end cover 1 is arranged at the left end of the left shell 3, a right end cover 14 is arranged at the right end of the right shell 13, a liquid inlet is formed in the left end cover 1, and a liquid outlet is formed in the right end cover 14; defining one end of the left shell 3 as a left end, one end of the right shell 13 as a right end, the axial direction is the direction of the central shaft or a direction parallel to the central shaft, the axial symmetry refers to symmetry about the central shaft, the radial direction refers to a direction in which the diameter of the cross section of the middle shell 8 (the left shell 3 or the right shell 13) is located, and the circumferential direction is a direction around the central shaft;
a left metering unit is arranged in the left shell 3, a right metering unit is arranged in the right shell 13, the left shell 3 is used for feeding liquid and discharging liquid through the left metering unit, and the right shell 13 is used for feeding liquid and discharging liquid through the right metering unit;
the left metering unit comprises a left cylinder body 4 coaxially arranged in the left shell 3, and the right metering unit comprises a right cylinder body 10 coaxially arranged in the right shell 13; a left piston 5 is coaxially arranged in the left cylinder 4, a right piston 11 is coaxially arranged in the right cylinder 10, the left piston 5 and the right piston 11 are connected through a shifting fork slide rod device which allows the left piston 5 and the right piston 11 to synchronously rotate and relatively independently axially move, and the shifting fork slide rod device is arranged in an inner cavity of the middle shell 8;
the left end and the right end of the left piston 5 hermetically penetrate through the left cylinder body 4, a first shoulder is arranged in the middle of the left piston 5 and is positioned in the left cylinder body 4, and the first shoulder divides an inner cavity of the left cylinder body 4 into a first closed left chamber C and a first closed right chamber I; the first shoulder is provided with two axisymmetric first left axial grooves a and two axisymmetric first right axial grooves b, and the first left axial grooves a and the first right axial grooves b are alternately arranged on the circumference of the cross section of the left piston 5 at equal intervals, wherein: the first left axial groove a is communicated with the first left chamber C, and the first right axial groove b is communicated with the first right chamber I;
the left end and the right end of the right piston 11 hermetically penetrate through the right cylinder body 10, a second shoulder is arranged in the middle of the right piston 11 and is positioned in the right cylinder body 10, and the inner cavity of the right cylinder body 10 is divided into a closed second left chamber L and a closed second right chamber R by the second shoulder; the second shoulder is provided with two axisymmetric second left axial grooves c and two axisymmetric second right axial grooves d, and the second left axial grooves c and the second right axial grooves d are alternately arranged on the circumference of the cross section of the right piston 16 at equal intervals, wherein: the second left axial groove c is communicated with a second left chamber L, and the second right axial groove d is communicated with a second right chamber R;
the left metering unit further comprises a pair of roller motion assemblies respectively positioned at the left end and the right end of the left metering unit, and the right metering unit further comprises another pair of roller motion assemblies respectively positioned at the left end and the right end of the right metering unit; and the roller motion assemblies all comprise matched rollers 15, 16, 19 and 20 and guide rails 2, 6, 9 and 12;
the left and right ends of the left cylinder body 4 are respectively provided with two axisymmetric hollow roller shafts 17 and 18, and the left and right ends of the right cylinder body 10 are also respectively provided with two axisymmetric hollow roller shafts 21 and 22, wherein: the inner ends of the hollow roller shafts 17 and 18 of the left metering unit are respectively fixed on the outer wall of the left cylinder body 4, and the outer ends of the hollow roller shafts 17 and 18 of the left metering unit extend along the radial direction to be fixedly connected with the inner wall of the left shell 3; the inner ends of the hollow roller shafts 21 and 22 of the right metering unit are fixed on the outer wall of the right cylinder body 10, and the outer ends of the hollow roller shafts 21 and 22 of the right metering unit radially extend to be fixedly connected with the inner wall of the right shell 13; the rollers 15 and 16 of the left metering unit and the rollers 19 and 20 of the right metering unit are sleeved on the hollow roller shafts 17, 18, 21 and 22 in a one-to-one rotatable manner;
the guide rails 2 and 6 of the left metering unit are respectively and coaxially fixed at the left end and the right end of the left piston 5 outside the left cylinder 4, and the guide rails 9 and 12 of the right metering unit are respectively and coaxially fixed at the left end and the right end of the right piston 11 outside the right cylinder 10;
specifically, the guide rails 2, 6, 9, and 12 are fixedly connected to the left piston 5 or the right piston 11 by means of keys, splines, or pins. Compared with the flowmeter in the prior art which takes the roller as the moving part, the guide rails 2, 6, 9 and 12 have uniform shapes, the fluctuation of the measured liquid caused by stirring is smaller, and the pressure loss of the measured liquid in the measuring process is smaller, so that the pressure drop of the inlet and the outlet of the flow can be effectively reduced, and the measuring precision of the invention can be effectively improved.
The rolling surfaces of the guide rails 2 and 6 of the left metering unit and the guide rails 9 and 12 of the right metering unit are both axial annular curved surfaces, the curved surfaces have axial fluctuation, the projections of the guide rails 2, 6, 9 and 12 in the central shaft direction are annular, the curved surfaces have 2 highest points T1 and 2 lowest points T2, the highest points T1 and the lowest points T2 are respectively positioned on two mutually perpendicular diameters of the circular ring, and the curved surfaces are respectively symmetrical according to the two diameters; the rollers 15, 16, 19, 20 roll on the rolling surfaces of the corresponding guide rails 2, 6, 9, 12 and push the left piston 5 and the right piston 11 to move axially; the inner ring side of the guide rails 2, 6, 9 and 12 is higher than the outer ring side, the rollers 15, 16, 19 and 20 are conical rollers, and the rolling surfaces of the rollers 15, 16, 19 and 20 are matched with the rolling surfaces of the guide rails 2, 6, 9 and 12;
two left axial through holes B and two left axial blind holes H are formed in the wall surface of the left shell 3, and the projections of the left axial through holes B and the left axial blind holes H on the cross section of the left shell 3 are alternately distributed at equal intervals along the circumference of the left shell 3; a left first window D is formed in the left axial through hole B, and a left second window G is formed in the left axial blind hole H;
two right axial through holes S and two right axial blind holes M are formed in the wall surface of the right shell 13, and the projections of the right axial through holes S and the right axial blind holes M on the cross section of the right shell 13 are alternately distributed at equal intervals along the circumference of the right shell 13; the right axial through hole S is provided with a right first window O, and the right axial blind hole M is provided with a right second window P;
a pair of first axial connecting through holes K respectively used for communicating the left axial blind hole H and the right axial through hole S are formed in the middle shell 8, and a pair of second axial connecting through holes J respectively used for communicating the left axial through hole B and the right axial blind hole M are also formed in the middle shell 8;
the left cylinder body 4 is provided with two axisymmetric left third windows E communicated with the first left axial groove a or the first right axial groove b, and the left cylinder body 4 is also provided with two axisymmetric left fourth windows F communicated with the first left axial groove a or the first right axial groove b; and the projections of the left third window E and the left fourth window F on the cross section of the left cylinder 4 are alternately distributed at equal intervals along the circumference of the left cylinder 4;
the right cylinder body 10 is provided with two axisymmetric right third windows N communicated with the second left axial groove c or the second right axial groove d, and the right cylinder body 4 is further provided with two axisymmetric right fourth windows Q communicated with the second left axial groove c or the second left right axial groove d; the projections of the right third window N and the right fourth window Q on the cross section of the right cylinder body 10 are alternately distributed at equal intervals along the circumference of the right cylinder body 10; the hollow roller shafts 17, 18, 21 and 22 are communicated along the radial direction, the inner end of the hollow roller shaft 17 at the left end of the left metering unit is communicated with the left third window E, and the outer end of the hollow roller shaft 17 at the left end of the left metering unit is communicated with the left first window D; the inner end of the hollow roller shaft 18 at the right end of the left metering unit is communicated with the left fourth window F, and the outer end of the hollow roller shaft 18 at the right end of the left metering unit is communicated with the left second window G;
the inner end of the hollow roller shaft 21 at the left end of the right metering unit is communicated with the right third window N, and the outer end of the hollow roller shaft 21 at the left end of the right metering unit is communicated with the right first window O; the inner end of the hollow roller shaft 22 at the right end of the right metering unit is communicated with the right fourth window Q, and the outer end of the hollow roller shaft 22 at the right end of the right metering unit is communicated with the right second window P;
specifically, one end close to the central axis of the middle housing 8 (left housing 3 or right housing 13) in the radial direction is taken as an inner end, and one end far from the central axis of the middle housing 8 (left housing 3 or right housing 13) in the radial direction is taken as an outer end.
The liquid inlet, the left axial through hole B, the left first window D, the hollow roller shaft 17 positioned at the left end of the left metering unit and the left third window E are communicated in sequence to form a liquid inlet channel of the left metering unit; the left fourth window F, the hollow roller shaft 18 positioned at the right end of the left metering unit, the left second window G, the left axial blind hole H, the first axial connecting through hole K, the right axial through hole S and the liquid outlet are sequentially communicated to form a liquid outlet channel of the left metering unit;
the liquid inlet, the left axial through hole B, the second axial connecting through hole J, the right axial blind hole M, the right second window P, the hollow roller shaft 22 positioned at the right end of the right metering unit and the right fourth window Q are sequentially communicated to form a liquid inlet channel of the right metering unit; the right third window N, the hollow roller shaft 21 positioned at the left end of the right metering unit, the right first window O, the right axial through hole S and the liquid outlet are communicated in sequence to form a liquid outlet channel of the right metering unit;
the waveforms of the curved surface undulations of the guide rails 2, 6 located at both ends of the left piston 5 are mutually in phase (i.e., the waveforms of the curved surface undulations of the guide rails 2, 6 located at both ends of the left piston 5 have no phase difference along the circumferential direction); the waveforms of the curved surface undulations of the guide rails 9, 12 located at both ends of the right piston 11 are mutually in phase (i.e., the waveforms of the curved surface undulations of the guide rails 9, 12 located at both ends of the right piston 11 have no phase difference in the circumferential direction);
the left metering unit and the right metering unit are arranged along the circumferential direction in a staggered mode of 45 degrees, namely: the left piston 5 and the right piston 11 are arranged by being staggered by 45 degrees along the circumferential direction, and the phase difference of the curved surface waveforms of the corresponding guide rails on the left piston 5 and the right piston 11 is 45 degrees (namely, the waveforms of the curved surface undulations of the guide rails 3 and 6 at the two ends of the left piston 5 and the guide rails 9 and 12 at the two ends of the right piston 11 are staggered by 45 degrees along the circumferential direction), so that the left cylinder 4 and the right cylinder 10 are fed and discharged with a phase difference of 45 degrees;
the shifting fork sliding rod device comprises a shifting fork 25 and a sliding rod 26, the shifting fork 25 is fixed on the guide rail 9 at the left end of the right piston 11, and the sliding rod 26 is fixedly arranged on the guide rail 6 at the right end of the left piston 5; fork openings with openings towards the right in the axial direction are formed in the two sides of the shifting fork 25, the sliding rod 26 is arranged in the radial direction, the fork openings of the shifting fork 25 are clamped and sleeved on the sliding rod 26, the sliding rod 26 can slide along the fork openings of the shifting fork 25, and the shifting fork 25 and the sliding rod 26 can synchronously move in the axial direction and can rotate in the circumferential direction;
a Hall element 24 is arranged on the outer wall of the middle shell 8, magnetic steel 7 which is induced with the Hall element 24 is arranged in the middle shell 8, and a central processing unit receives a pulse electric signal sent by the Hall element 24 and calculates the flow according to the pulse electric signal;
specifically, four magnetic steels 7 are fixedly arranged on the guide rail 9 at the left end of the right piston 11 at equal intervals in the circumferential direction. The hall element 24 transmits the pulse electrical signal to the central processing unit through the aviation plug 23.
The positions of the first left axial groove a, the first right axial groove b, the second left axial groove c, the second right axial groove D, the left first window D, the left second window G, the left third window E, the left fourth window F, the right first window O, the right second window P, the right third window N, and the right fourth window Q have the following correspondence:
in the first state (when the left piston 5 is at 0 ° or 180 °):
in the right metering unit, the measured liquid pushes the right piston 11 to move rightwards along the axial direction, and the right piston 11 is forced to rotate along the circumferential direction by the roller motion assembly (the guide rails 9 and 12 and the rollers 19 and 20) on the right piston 11; the second left axial groove c is aligned with the right fourth window Q and the second right axial groove d is aligned with the right third window N, as shown in fig. 16 b; the second left chamber L is communicated with the second left groove c through a liquid inlet channel of the right metering unit, and the second right chamber R is communicated with the liquid outlet channel of the right metering unit through a liquid outlet channel of the right metering unit;
in the left metering unit, the left piston 5 is driven by the right piston 11 to rotate along the circumferential direction, and the left piston 5 is forced to move leftwards along the axial direction by the roller motion components (the guide rails 2 and 6 and the rollers 15 and 16) on the left piston 5; the first left axial groove a is not communicated with the left third window E and the left fourth window F, and the first right axial groove b is not communicated with the left third window E and the left fourth window F, as shown in fig. 16 a; the first left chamber C neither feeds nor discharges liquid, and the first right chamber I neither feeds nor discharges liquid;
in the second state: (left piston 5 at 45 degree)
In the left metering unit, the tested liquid pushes the left piston 5 to move leftwards along the axial direction, and the left piston 5 rotates along the circumferential direction under the force of the roller motion components (the guide rails 2 and 6 and the rollers 15 and 16) on the left piston 5; said first left axial slot a is aligned with said left fourth window F and said first right axial slot b is aligned with said left third window E, as shown in fig. 17 a; the first right chamber I is used for feeding liquid through a liquid inlet channel of the left metering unit and the first right groove b which are communicated, and the first left chamber C is used for discharging liquid through a liquid outlet channel of the left metering unit and the first left groove a which are communicated;
in the right metering unit, the right piston 11 is driven by the left piston 5 to rotate along the circumferential direction, and the right piston 11 is forced by the roller motion assembly (the guide rails 9 and 12 and the rollers 19 and 20) on the right piston 11 to move leftwards along the axial direction; the second left axial groove c is not communicated with the right third window N and the right fourth window Q, and the second right axial groove d is also not communicated with the right third window N and the right fourth window Q, as shown in fig. 17 b; the second left chamber L neither feeds nor discharges liquid, and the second right chamber R neither feeds nor discharges liquid;
in the third state: (left piston 5 at 90 degree)
In the right metering unit, the measured liquid pushes the right piston 11 to move leftwards along the axial direction, and the right piston 11 is forced to move downwards along the circumferential direction by the roller motion assembly (the guide rails 9 and 12 and the rollers 19 and 20) on the right piston 11; the second left axial groove c is aligned with the right third window N and the second right axial groove d is aligned with the right fourth window Q, as shown in fig. 18 b; the second right chamber R is used for feeding liquid through a liquid inlet channel of the right metering unit and the second right groove d which are communicated, and the second left chamber L is used for discharging liquid through a liquid outlet channel of the right metering unit and the second left groove c which are communicated;
in the left metering unit, the left piston 5 is driven by the right piston 11 to rotate along the circumferential direction, and the left piston 5 is forced to move to the right along the axial direction by the roller moving components (the guide rails 2 and 6 and the rollers 15 and 16) on the left piston 5; the first left axial groove a is not communicated with the left third window E and the left fourth window F, and the first right axial groove b is not communicated with the left third window E and the left fourth window F, as shown in fig. 18 a; the first left chamber C neither feeds nor discharges liquid, and the first right chamber I neither feeds nor discharges liquid;
in the fourth state: (left piston 5 at 135 degree)
In the left metering unit, the tested liquid pushes the left piston 5 to move rightwards, and the left piston 5 rotates along the circumferential direction under the force of the roller motion assembly (the guide rails 2 and 6 and the rollers 15 and 16) on the left piston 5; said first left axial slot a is aligned with said left third window E and said first right axial slot b is aligned with said left fourth window F, as shown in fig. 19 a; the first left chamber C is communicated with the first left groove a through a liquid inlet channel of the left metering unit, and the first right chamber I is communicated with the liquid outlet channel of the left metering unit through the first right groove b;
in the right metering unit, the right piston 11 is driven by the left piston 5 to rotate along the circumferential direction, and the right piston 11 is forced by the roller moving components (the guide rails 9 and 12 and the rollers 19 and 20) on the right piston 11 to move to the right along the axial direction; the second left axial groove c is not communicated with the right third window N and the right fourth window Q, and the second right axial groove d is also not communicated with the right third window N and the right fourth window Q, as shown in fig. 19 b; the second left chamber L neither feeds nor discharges liquid, and the second right chamber R neither feeds nor discharges liquid;
first sealing components are respectively arranged between the two ends of the first axial connecting through hole K and the left axial blind hole H and the right axial through hole S; second sealing components are respectively arranged between the two ends of the second axial connecting through hole J and the left axial through hole B and the right axial blind hole M;
the hollow roller shafts 17, 18, 21 and 22 are fixedly connected with the left shell 3 or the right shell 13 through bolts and the like, and third sealing members are arranged between the hollow roller shafts 17, 18, 21 and 22) and the left shell 3 or the right shell 13.
Further, the first sealing member, the second sealing member and the third sealing member are all sealing rings.
Specifically, the first sealing member, the second sealing member and the third sealing member ensure that the liquid inlet channel of the left metering unit and the liquid inlet channel of the right metering unit are independent from the liquid outlet channel of the left metering unit and the liquid outlet channel of the right metering unit, so that liquid does not flow between the liquid inlet channel and the liquid outlet channel.
The liquid flowing out through the liquid outlet channel of the left metering unit and the liquid flowing through the liquid outlet channel of the right metering unit are converged in an inner cavity T formed by the right end cover 14 and the right shell 13 and then discharged. The liquid can be fed from the liquid outlet on the right end cover 14, and then the liquid is discharged from the liquid inlet on the left end cover 1 after being converged in the cavity A formed by the left shell 3 and the left end cover 1, so that the liquid inlet channel of the left metering unit and the liquid inlet channel of the right metering unit are both used for liquid, and the liquid outlet channel of the left metering unit and the liquid outlet channel of the right metering unit are both used for liquid feeding, but the working principle is the same.
Further, the left shell 3 and the right shell 13 are respectively fixedly connected with the middle shell 8 through bolts.
Further, the left end cover 1 and the left shell 3, and the right end cover 14 and the right shell 13 are fixed by bolts respectively.
Further, the rollers 15, 16, 19, 20 are rotatably provided on the hollow roller shafts 17, 18, 21, 22 through bearings.
Further, the widths of the left first window D, the left second window G, the left third window E, the left fourth window F, the right first window O, the right second window P, the right third window N, the right fourth window Q, the first left axial groove a, the first right axial groove b, the second left axial groove c, and the second right axial groove D in the circumferential direction are the same; and the radians of the left third window E, the left fourth window F, the right third window N, the right fourth window Q, the first left axial groove a, the first right axial groove b, the second left axial groove c and the second right axial groove d along the circumferential direction are all 45 degrees.
Furthermore, two communicate through left first radial spread groove between the first left axial groove a, two communicate through left second radial spread groove between the first right axial groove b, just left side first radial spread groove with left second radial spread groove all follows radial interval sets up in the left side piston 5.
Further, two communicate through right first radial spread groove between the left axial groove c of second, two communicate through right second radial spread groove between the right axial groove d of second, just right first radial spread groove with right second radial spread groove all follows radial interval sets up in the right piston 11.
Specifically, the left first radial connecting groove is communicated with two first left axial grooves a, and the two first left axial grooves a flow after being converged by the left first radial connecting groove, so that the flow field of the liquid to be measured is more stable; in a similar way, the arrangement of the left second radial connecting groove, the right first radial connecting groove and the right second radial connecting groove also enables the flow field of the liquid to be measured to be more stable, and the pressure loss of the measured fluid to be smaller, so that the measurement of the invention is more accurate.
Further, a rolling body 27 is coaxially and rotatably sleeved on the sliding rod 26, and the fork opening of the shifting fork 25 is connected with the sliding rod 26 through the rolling body 27.
Specifically, by providing the rolling body 27, rolling friction is generated between the shift fork 25 and the slide rod 26, so that frictional resistance is reduced, and frictional force between the shift fork 25 and the slide rod 26 is reduced.
Specifically, the hollow roller shafts 17, 18, 21 and 22 penetrate through in the radial direction, the hollow roller shafts 17, 18, 21 and 22 simultaneously serve as roller shafts and flow channels, and the hollow roller shafts 17, 18, 21 and 22 are fixedly communicated with the left shell 3 and the left cylinder body 4 and fixedly communicated with the right shell 13 and the right cylinder body 10, so that the structure is simpler and more compact, and the volume of the flowmeter is reduced.
In the embodiment, the left piston 5 performs axial reciprocating motion and circumferential rotation in the left cylinder 4, and the right piston 11 performs axial reciprocating motion and circumferential rotation in the right cylinder 10; the fork 25 allows the sliding rod 27 to slide, and the fork sliding rod device ensures that the left piston 5 and the right piston 11 keep synchronous rotation and can realize free relative axial movement.
In this embodiment, when the magnetic steel 7 is aligned with the hall element 24, the magnetic induction intensity between the magnetic steel and the hall element is the maximum, the hall element 24 sends a pulse electrical signal to the central processing unit, the central processing unit receives the pulse electrical signal and calculates the rotating speed of the shifting fork 25 according to the pulse electrical signal interval time, and the central processing unit calculates the flow rate according to the rotating speed and the effective volume of the metering cavity (the metering cavity is composed of a first left chamber C, a first right chamber I, a second left chamber L and a second right chamber R). Since the minimum volume of the first left chamber C, the first right chamber I, the second left chamber L or the second right chamber R is generally not zero, the effective volume of the first left chamber C, the first right chamber I, the second left chamber L or the second right chamber R is the difference between the respective maximum and minimum volumes, and the effective volume of the metering chamber is the sum of the effective volumes of the first left chamber C, the first right chamber I, the second left chamber L and the second right chamber R.
In this embodiment, the guide rails 2, 6, 9, 12 are circular rings, so that the regular shape can greatly reduce the resistance brought to the moving component by the stirring of the moving component in the liquid, thereby reducing the kinetic energy of the fluid to be side lost by pushing the moving component to move, and playing a role in reducing pressure loss.
In the present embodiment, one surface of each of the guide rails 2, 6, 9, 12 is a flat surface, and the other surface thereof is an axially undulating curved surface. Two highest points T1 and two axisymmetric lowest points T2 are alternately arranged on the curved surface. When the left piston 5 or the right piston 11 rotates along the circumferential direction, the guide rails 2, 6, 9, 12 rotate synchronously, so that the contact points of the guide rails 2, 6, 9, 12 and the corresponding rollers change, and if the contact points of the rollers and the guide rails move from the lowest point T2 to the adjacent highest point T1, the acting force of the rollers 15, 16, 19, 20 on the guide rails 2, 6, 9, 12 synchronously forces the left piston 5 or the right piston 11 to move axially; if the contact point of the guide rail 2, 6, 9, 12 with the corresponding roller moves from the highest point T1 to the adjacent lowest point T2, the force of the roller 15, 16, 19, 20 on the guide rail 2, 6, 9, 12 will force the left piston 5 or the right piston 11 to move axially. When the left piston 5 or the right piston 11 is driven by hydraulic pressure to move in the axial direction, the guide rails 2, 6, 9, 12 press the rollers 15, 16, 19, 20, and the acting force of the guide rails 2, 6, 9, 12 on the rollers 15, 16, 19, 20 generates the reaction force of the rollers 15, 16, 19, 20 on the guide rails, so that the guide rails 2, 6, 9, 12 are forced to rotate in the circumferential direction, and the left piston 5 or the right piston 11 is driven to rotate in the circumferential direction.
In this embodiment, because the waveforms of the curved undulations of the guide rails 2 and 6 at the two ends of the left piston 5 are all in phase with each other, and the rollers 15 and 16 at the two ends of the left cylinder 4 have a position difference of 90 ° in the circumferential direction, the waveforms of the curved undulations of the guide rails 9 and 12 at the two ends of the right piston 11 are also in phase with each other, and the rollers 19 and 20 at the two ends of the right cylinder 10 have a position difference of 90 ° in the circumferential direction, that is, when the contact point between the roller at one side of the left piston 5 or the right piston 11 and the guide rail moves from the lowest point T2 to the highest point T1, the contact point between the cone roller at the other side of the left piston 5 or the right piston 11 and the guide rail just moves from the highest point T1 to the lowest point T2, and the roller motion assemblies at the two sides urge.
In the present embodiment, the area between the lowest point T2 and the highest point T1 adjacent to each other on the guide rails 2, 6, 9, 12 forms a movement interval, each movement interval corresponds to a central angle of 90 °, and in each movement interval, the left piston 5 or the right piston 11 performs one axial movement in one direction. And because the shape of the inner curved surface of each motion interval is the same, the waveforms of the curved surfaces of the adjacent motion intervals are in opposite phases, so that the left piston 5 or the right piston 11 moves leftwards and rightwards with the same speed curve.
In the present embodiment, the shape of the guide rails 2, 6, 9, 12 makes the left piston 5 or the right piston 11 satisfy the deceleration motion law such as equal acceleration, i.e. in each motion interval, in the first half of the interval, the left piston 5 or the right piston 11 accelerates with the same acceleration, and in the second half of the interval, the left piston 5 or the right piston 11 decelerates with the same deceleration, so that the left piston 5 or the right piston 11 moves leftwards and rightwards with the same acceleration curve, so that the motion of the left piston 5 or the right piston 11 is definitely controllable.
In this embodiment, the rolling surface of the roller is attached to the curved surface of the guide rail 2, 6, 9, 12, and the extension line of the attachment line between the roller and the guide rail 2, 6, 9, 12 intersects the central axis of the left piston 5 or the right piston 11 at a point, so that the difference between the linear velocities of the roller and the contact line between the roller and the guide rail 2, 6, 9, 12 is minimized, and the roller is prevented from slipping during rotation.
In the present embodiment, the left piston 5 and the right piston 11 have the same structure, the first shoulder on the left piston 5 is sealed with the inner wall surface of the left cylinder 4, and the second shoulder on the right piston 11 is sealed with the inner wall surface of the right cylinder 10, so as to effectively reduce the internal leakage.
In the present embodiment, the volumes of the first left chamber C and the first right chamber I change during the axial movement of the left piston 5, and the volumes of the second left chamber L and the second right chamber R change during the axial movement of the right piston 11. When the left piston 5 is located at the middle of its axial stroke, the volumes of the first left chamber C and the first right chamber I are equal, and when the left piston 5 is located at the leftmost end of its axial stroke, the volume of the first left chamber C is at the minimum (i.e., the minimum volume of the first left chamber C), and the volume of the first right chamber I is at the maximum (i.e., the maximum volume of the first right chamber I); when the left piston 5 is at the rightmost end of its axial stroke, the volume of the first left chamber C is at a maximum (i.e. the maximum volume of the first left chamber C) and the volume of the first right chamber I is at a minimum (i.e. the minimum volume of the first right chamber I).
Similarly, when the right piston 11 is located at the middle position of the axial stroke, the volumes of the second left chamber L and the second right chamber R are equal, and when the right piston 11 is located at the leftmost end of the axial stroke, the volume of the second left chamber L is at the minimum (i.e., the minimum volume of the second left chamber L), and the volume of the second right chamber R is at the maximum (i.e., the maximum volume of the second right chamber R); when the right piston 11 is located at the rightmost end of its axial stroke, the volume of the second left chamber L is at a maximum (i.e., the maximum volume of the second left chamber L), and the volume of the second right chamber R is at a minimum (i.e., the minimum volume of the second left chamber R).
In the embodiment, the middle of the highest point T1 and the lowest point T2 in each motion interval on the guide rail has a middle point T0, the corresponding central angle between the highest point T1 and the middle point T0 is 45 °, and the corresponding central angle between the lowest point T2 and the middle point T0 is 45 °.
Specifically, referring to fig. 1, the zero state of the present invention is defined as: in the left cylinder 4, the left piston 5 is located at the rightmost end of the axial stroke, the communication areas of the first left axial groove a and the left third window E or the left fourth window F are both zero, and the communication areas of the first right axial groove b and the left second window E or the left fourth window F are both zero; (ii) a The lowest point T2 of the guide rail 2 at the left end of the left piston 5 is in contact with the roller 15 at the left end of the left cylinder 4, and the highest point T1 of the guide rail 6 at the right end of the left piston 5 is in contact with the roller 16 at the right end of the left cylinder 4. In the right cylinder 10, the right piston 11 is located at the middle position of the axial stroke thereof, the second left axial groove c is completely aligned with the right fourth window Q, the communication area is the largest, and the second right axial groove d is completely aligned with the right third window N, the communication area is the largest; the middle point T0 of the guide rail 9 at the left end of the right piston 11 is in contact with the roller 19 at the left end of the right cylinder 10, and the middle point T0 of the guide rail 12 at the right end of the right piston 11 is in contact with the roller 20 at the right end of the right cylinder 10. The left piston 5 rotates for 360 degrees along the circumferential direction, and in a zero position state, the left piston 5 (the right piston 11 can also be used as a reference standard) is positioned at 0 degree, and the liquid to be measured is filled from a liquid inlet of the left end cover 1 and flows out from a liquid outlet of the right end cover 14.
Referring to fig. 16a to 20, when the left piston 5 and the right piston 11 are rotated according to the rotation direction X shown in fig. 1, and the rotation direction X is defined as a clockwise direction, and the left piston 5 and the right piston 11 simultaneously move axially according to the axial motion rule shown in fig. 20, the working process of the present invention in a working period (0 to 180 °) is as follows:
1. when the left piston 5 is rotated from 0 to 45,
in the right metering unit, refer to fig. 16 b:
when the angle is 0 degrees, the second left axial groove c is completely aligned with the right fourth window Q, the communication area is the largest, the second right axial groove d is completely aligned with the right third window N, the communication area is the largest, the liquid inlet flow of the second left chamber L is the largest, and the liquid discharge flow of the second right chamber R is also the largest;
the measured liquid enters a second left chamber L from a liquid inlet channel of the right metering unit and the second left axial groove c in sequence, and pushes the right piston 11 to move rightwards from the middle position of the axial stroke to the rightmost end of the axial stroke along the axial direction; and in the process that the right piston 11 moves rightwards along the axial direction, the guide rail 9 at the left end of the right piston 11 presses the roller 19 at the left end of the right cylinder 10, so that the contact point of the roller 19 at the left end of the right cylinder 10 and the guide rail 9 at the left end of the right piston 11 moves to the lowest point T2 from the middle point T0 of the curved surface, and the contact point of the roller 20 at the right end of the right cylinder 10 on the guide rail 12 at the right end of the right piston 11 moves to the highest point T1 from the middle point T0 of the curved surface; then the roller motion assembly on the right piston 11 forces the right piston 11 to rotate in the clockwise direction;
in the process that the right piston rotates from 0 degrees to 45 degrees, the communication area of the second left axial groove c and the right fourth window Q is gradually reduced from the maximum value at 0 degrees to zero, and the communication area of the second right axial groove d and the right third window N is also reduced from the maximum value at 0 degrees to zero; the measured liquid sequentially passes through the liquid inlet channel of the right metering unit and the second left axial groove c to enter the second left chamber L, and the volume of the second left chamber L is gradually increased to the maximum; under the extrusion action of the right piston 11, the volume of the second right chamber R is gradually reduced to the minimum, and the liquid in the second right chamber R is discharged through the second right axial groove d and the liquid outlet channel of the right metering unit in sequence;
in the left metering unit, refer to fig. 16 a:
when the angle is 0 degrees, the communication area of the first left axial groove a and the left third window E or the left fourth window F is zero, and the communication area of the first right axial groove b and the left third window E or the left fourth window F is also zero; the first left cavity C neither feeds nor discharges liquid, and the first right cavity I neither feeds nor discharges liquid;
the right piston 11 drives the left piston 5 to rotate clockwise through a shifting fork slide rod mechanism, a contact point of a roller 15 at the left end of the left cylinder 4 and a guide rail 2 at the left end of the left piston 5 moves from a lowest point T2 to a middle point T0, a contact point of a roller 16 at the right end of the left cylinder 4 and a guide rail 6 at the right end of the left piston 5 moves from a highest point T1 to a middle point T0, and then a roller motion assembly of the left piston upper 5 drives the left piston 5 to move left from the rightmost end of the axial stroke to a middle position of the axial stroke;
in the process that the left piston 5 rotates from 0 degrees to 45 degrees, the communication area of the first left axial groove a and the left fourth window F is gradually increased from zero at 0 degrees to the maximum, and the communication area of the first right axial groove b and the left third window E is also gradually increased from zero at 0 degrees to the maximum; liquid enters the first right chamber I through the liquid inlet channel of the left metering unit and the first right axial groove b in sequence, the volume of the first right chamber I is gradually increased, the volume of the first left chamber C is gradually reduced under the extrusion action of the left piston 5, and the measured liquid in the first left chamber C is discharged through the first left axial groove a and the liquid outlet channel of the left metering unit in sequence;
2. when the left piston 5 rotates from 45 ° to 90 °
In the left metering unit, refer to fig. 17 a:
when the angle is 45 degrees, the first left axial groove a is completely aligned with the left fourth window F, the communication area is the largest, the first right axial groove b is completely aligned with the left third window E, the communication area is the largest, the flow rate of liquid inlet of the first right chamber I is the largest, and the flow rate of liquid discharged by the first left chamber C is also the largest;
the measured liquid enters the first right chamber I from the liquid inlet channel of the left metering unit and the first right axial groove b in sequence, and pushes the left piston 5 to move leftwards along the axial direction to the leftmost end of the axial stroke; in the process that the left piston 4 moves leftwards along the axial direction, the guide rail 6 at the right end of the left piston 5 extrudes the roller 16 at the right end of the left cylinder 4, so that the contact point of the roller 16 at the right end of the left cylinder 4 and the guide rail 6 at the right end of the left piston 5 moves to the lowest point T2 from the middle point T0 of the curved surface, the contact point of the roller 15 at the left end of the left cylinder 4 and the guide rail 2 at the left end of the left piston 5 moves to the highest point T1 from the middle point T0 of the curved surface, and the roller motion assembly on the left piston 5 forces the left piston 5 to rotate clockwise;
during the process that the left piston rotates from 45 degrees to 90 degrees, the communication area of the first left axial groove a and the left fourth window F is gradually reduced from the maximum at 45 degrees to zero, and the communication area of the first right axial groove b and the left third window E is also gradually reduced from the maximum at 45 degrees to zero; the measured liquid sequentially passes through the liquid inlet channel of the left metering unit and the first right axial groove b to enter the first right chamber I, and the volume of the first right chamber I is gradually increased to the maximum; under the extrusion action of the left piston 5, the volume of the first left chamber C is gradually reduced to the minimum, and the liquid in the first left chamber C is discharged through the first left axial groove a and the liquid outlet channel of the left metering unit in sequence;
in the right metering unit, refer to fig. 17 b:
when the angle is 45 degrees, the communication area between the second left axial groove c and the right third window N or the right fourth window Q is zero, and the communication area between the second right axial groove d and the right second window N or the right fourth window Q is also zero; the second left cavity L neither feeds nor discharges liquid, and the second right cavity R neither feeds nor discharges liquid;
the left piston 5 drives the right piston 11 to rotate clockwise through a shifting fork slide rod mechanism, a contact point of a roller 19 at the left end of the right cylinder 10 and a guide rail 9 at the left end of the right piston 11 moves from a lowest point T2 to a middle point T0, a roller 20 at the right end of the right cylinder 10 and a guide rail 12 at the right end of the right piston 11 move from a highest point T1 to a middle point T0, and then a roller motion assembly on the right piston 11 drives the right piston 11 to move left from the rightmost end of the axial stroke to a middle position of the axial stroke;
in the process that the right piston 11 rotates from 45 ° to 90 °, the communication area between the second left axial groove c and the right third window N gradually increases from zero at 90 ° to the maximum, and the communication area between the second right axial groove d and the right fourth window Q also gradually increases from zero at 90 ° to the maximum; the measured liquid sequentially passes through the liquid inlet channel of the right metering unit and the second right axial groove d to enter the second right chamber R, and the volume of the second right chamber R is gradually increased; under the extrusion action of the right piston 11, the volume of the second left chamber L is gradually reduced, and the measured liquid in the second left chamber L sequentially flows through the second left axial groove c and the liquid outlet channel of the right metering unit and flows out;
3. when the left piston 5 rotates from 90 ° to 135 °
In the right metering unit, refer to fig. 18 b:
when the angle is 90 degrees, the second left axial groove c is completely aligned with the right third window N, the communication area is the largest, the second right axial groove d is completely aligned with the right fourth window Q, and the communication area is the largest, so that the flow rate of liquid inlet of the second right chamber R is the largest, and the flow rate of liquid discharged by the second left chamber L is also the largest;
the measured liquid enters the second right chamber R from the liquid inlet channel of the right metering unit and the second right axial groove d in sequence, and pushes the right piston 11 to move leftwards along the axial direction from the middle position of the axial stroke to the leftmost end of the axial stroke; during the process that the right piston 11 moves leftwards along the axial direction, the guide rail 12 at the right end of the right piston 11 presses the roller 20 at the right end of the right cylinder 10, so that the contact point of the roller 20 at the right end of the right piston 11 and the guide rail 12 at the right end of the right piston 11 moves to the lowest point T2 from the middle point T0 of the curved surface, and the contact point of the roller 19 at the left end of the right cylinder 10 and the guide rail 9 at the left end of the right piston 11 moves to the highest point T1 from the middle point T0 of the curved surface; then the roller motion assembly on the right piston 11 forces the right piston 11 to rotate in the clockwise direction;
in the process that the right piston rotates from 90 degrees to 135 degrees, the communication area between the second left axial groove c and the right third window N is gradually reduced from the maximum at 90 degrees to zero, and the communication area between the second right axial groove d and the right fourth window Q is also reduced from the maximum at 90 degrees to zero; the measured liquid sequentially passes through the liquid inlet channel of the right metering unit and the second right axial groove d to enter the second right chamber R, and the volume of the second right chamber R is gradually increased to the maximum; under the extrusion action of the right piston 11, the volume of the second left chamber L gradually reaches the minimum, and the liquid in the second left chamber L is discharged through the second left axial groove c and the liquid outlet channel of the right metering unit in sequence;
in the left metering unit, refer to fig. 18 a:
when the angle is 90 degrees, the communication area between the first left axial groove a and the left third window E or the left fourth window F is zero, and the communication area between the first right axial groove b and the left third window E or the left fourth window F is also zero; the first left cavity C neither feeds nor discharges liquid, and the first right cavity I neither feeds nor discharges liquid;
the right piston 11 drives the left piston 5 to rotate clockwise through a shifting fork slide rod mechanism, a contact point of a roller 15 at the left end of the left cylinder 4 and a guide rail 2 at the left end of the left piston 5 moves from a highest point T1 to an intermediate point T0, and a contact point of a roller 16 at the right end of the left cylinder 4 and a guide rail 6 at the right end of the left piston 5 moves from a lowest point T2 to an intermediate point T0; the roller motion assembly on the left piston 5 drives the left piston 5 to move from the left end of the axial stroke of the left piston to the middle position of the axial stroke of the left piston along the axial direction;
during the rotation of the right piston 5 from 90 ° to 135 °, the communication area between the first left axial groove a and the left second window E gradually increases from zero at 90 ° to the maximum, and the communication area between the first right axial groove b and the left fourth window F also gradually increases from zero at 90 ° to the maximum; the measured liquid sequentially passes through the liquid inlet channel of the left metering unit and the first left axial groove a to enter the first left chamber C, and the volume of the first left chamber C is gradually increased; under the extrusion action of the left piston 5, the volume of the first right chamber I is gradually reduced, and the measured liquid in the first right chamber I sequentially flows through the first right axial groove b and the liquid outlet channel of the left metering unit and flows out;
4. when the left piston 5 rotates from 135 deg. to 180 deg.
In the left metering unit, see fig. 19 a:
at 135 °, the first left axial groove a is completely aligned with the left third window E, and the communication area is the largest, the second right axial groove b is completely aligned with the left fourth window F, and the communication area is the largest, so that the flow rate of the liquid fed into the first left chamber C is the largest, and the flow rate of the liquid discharged from the first right chamber I is also the largest;
the measured liquid enters the first left chamber C from the liquid inlet channel of the left metering unit and the first left axial groove a in sequence, and pushes the left piston 5 to move from the middle position of the axial stroke to the rightmost end of the axial stroke along the axial direction; during the process that the left piston 5 moves rightwards along the axial direction, the roller 15 at the left end of the left cylinder 4 presses the guide rail 2 at the left end of the left piston 5, so that the contact point of the roller 15 at the left end of the left cylinder 4 and the guide rail 2 at the left end of the left piston 5 moves to the lowest point T2 from the middle point T0 of the curved surface, and the contact point of the roller 16 at the right end of the left cylinder 4 and the guide rail 6 at the right end of the left piston 5 moves to the highest point T1 from the middle point T0 of the curved surface; the roller motion assembly on the left piston 5 forces the left piston 5 to rotate in a clockwise direction;
during the process that the left piston rotates from 135 degrees to 180 degrees, the communication area of the first left axial groove a and the left third window E is gradually reduced from the maximum at 135 degrees to zero, and the communication area of the first right axial groove b and the left fourth window F is also reduced from the maximum at 135 degrees to zero; the measured liquid sequentially passes through the liquid inlet channel of the left metering unit and the first left axial groove a to enter the first left chamber C, and the volume of the first left chamber C is gradually increased to the maximum; under the extrusion action of the left piston 5, the volume of the first right chamber I is gradually reduced to the minimum, and then the liquid in the first right chamber I is discharged through the first right axial groove b and the liquid outlet channel of the left metering unit in sequence;
in the right metering unit, see fig. 19 b:
at 135 °, the communication area between the second left axial groove c and the right third window N or the right fourth window Q is zero, and the communication area between the second right axial groove d and the right third window N or the right fourth window Q is also zero; the second left cavity L neither feeds nor discharges liquid, and the second right cavity R neither feeds nor discharges liquid;
the left piston 5 drives the right piston 11 to rotate clockwise through a shifting fork slide rod mechanism, a contact point of a roller 19 at the left end of the right cylinder 10 and a guide rail 9 at the left end of the right piston 11 moves from a highest point T1 to a middle point T0, a contact point of a roller 20 at the right end of the right cylinder 10 and a guide rail 12 at the right end of the right piston 11 moves from a lowest point T2 to a middle point T0, and a roller motion assembly on the right piston 11 drives the right piston 11 to move rightwards from the rightmost end of the axial stroke to the middle position of the axial stroke;
during the process that the right piston 11 rotates from 135 ° to 180 °, the communication area between the second left axial groove c and the right fourth window Q gradually increases from zero at 135 ° to the maximum, and the communication area between the second right axial groove d and the right third window N also gradually increases from zero at 135 ° to the maximum; the measured liquid sequentially passes through the liquid inlet channel of the right metering unit and the second left axial groove c to enter the second left chamber L, and the volume of the second left chamber L is gradually increased; under the extrusion action of the right piston 11, the volume of the second right chamber R is gradually reduced, and the measured liquid in the second right chamber R sequentially flows out through the second right axial groove d and the liquid outlet channel of the right metering unit.
The cycle is repeated every 180 ° of rotation of the left piston 5 (or right piston 11) of the flowmeter of the present invention. If the left piston 5 (or the right piston 11) completes one reciprocating motion after rotating 180 degrees every time, the passing liquid has two unit volumes, and the two pistons complete two reciprocating motions and discharge four unit volumes of liquid under the condition of rotating 360 degrees in a circle. Because four symmetrical magnetic steels 7 are uniformly distributed on the guide rail 9 at the left end of the right piston along the circumferential direction, the magnetic steels 7 interact with the Hall element 24 arranged on the middle shell 8 to send out pulse signals. The magnetic steel 7 does reciprocating motion and circumferential rotation simultaneously along with the guide rail 9 at the left end of the right piston, and when the magnetic steel rotates 180 degrees, the Hall element 24 sends out two voltage pulse signals corresponding to the liquid flow of two unit volumes. Therefore, in the case of rotating 360 ° one turn, the hall element 24 emits a voltage pulse signal four times corresponding to four liquid flow rates per unit volume.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but rather by the equivalents thereof as may occur to those skilled in the art upon consideration of the present inventive concept.

Claims (9)

1. A movable guide rail type flowmeter is characterized in that: the device comprises a left shell (3) and a right shell (13), wherein the left shell (3) and the right shell (13) are hermetically communicated through a middle shell (8), and the central axes of the left shell (3), the right shell (13) and the middle shell (8) are overlapped; a left end cover (1) is arranged at the left end of the left shell (3), a right end cover (14) is arranged at the right end of the right shell (13), a liquid inlet is formed in the left end cover (1), and a liquid outlet is formed in the right end cover (14); defining one end of the left shell (3) as a left end, one end of the right shell (13) as a right end, the axial direction is the direction of the central shaft or the direction parallel to the central shaft, the axial symmetry refers to the symmetry with the central shaft, the radial direction refers to the direction of the diameter of the cross section of the middle shell (8), and the circumferential direction is the direction around the central shaft;
a left metering unit is arranged in the left shell (3), a right metering unit is arranged in the right shell (13), the left shell (3) is used for feeding liquid and discharging liquid through the left metering unit, and the right shell (13) is used for feeding liquid and discharging liquid through the right metering unit;
the left metering unit comprises a left cylinder body (4) coaxially arranged in the left shell (3), and the right metering unit comprises a right cylinder body (10) coaxially arranged in the right shell (13); a left piston (5) is coaxially arranged in the left cylinder body (4), a right piston (11) is coaxially arranged in the right cylinder body (10), the left piston (5) is connected with the right piston (11) through a shifting fork sliding rod device which allows the left piston (5) and the right piston (11) to synchronously rotate and axially move relatively independently, and the shifting fork sliding rod device is arranged in an inner cavity of the middle shell (8);
the left end and the right end of the left piston (5) penetrate through the left cylinder body (4) in a sealing mode, a first shoulder is arranged in the middle of the left piston (5), and the first shoulder divides an inner cavity of the left cylinder body (4) into a first closed left cavity (C) and a first closed right cavity (I); the first shoulder is provided with two axisymmetric first left axial grooves (a) and two axisymmetric first right axial grooves (b), and the first left axial grooves (a) and the first right axial grooves (b) are alternately arranged on the circumference of the cross section of the left piston (5) at equal intervals, wherein: the first left axial groove (a) communicates with the first left chamber (C), the first right axial groove (b) communicates with the first right chamber (I);
the left end and the right end of the right piston (11) penetrate through the right cylinder body (10) in a sealing mode, a second shoulder is arranged in the middle of the right piston (11), and the second shoulder divides an inner cavity of the right cylinder body (10) into a closed second left cavity (L) and a closed second right cavity (R); the second shoulder is provided with two axisymmetric second left axial grooves (c) and two axisymmetric second right axial grooves (d), and the second left axial grooves (c) and the second right axial grooves (d) are alternately arranged on the circumference of the cross section of the right piston (16) at equal intervals, wherein: the second left axial groove (c) communicates with a second left chamber (L), the second right axial groove (d) communicates with the second right chamber (R);
the left metering unit further comprises a pair of roller motion assemblies respectively positioned at the left end and the right end of the left metering unit, and the right metering unit further comprises another pair of roller motion assemblies respectively positioned at the left end and the right end of the right metering unit; and the roller motion assemblies comprise matched rollers (15, 16, 19, 20) and guide rails (2, 6, 9, 12);
the left and right ends of the left cylinder body (4) are respectively provided with two axisymmetric hollow roller shafts (17, 18), the left and right ends of the right cylinder body (10) are also respectively provided with two axisymmetric hollow roller shafts (21, 22), wherein: the inner ends of the hollow roller shafts (17 and 18) of the left metering unit are respectively fixed on the outer wall of the left cylinder body (4), and the outer ends of the hollow roller shafts (17 and 18) of the left metering unit extend to be fixedly connected with the inner wall of the left shell (3) along the radial direction; the inner ends of the hollow roller shafts (21 and 22) of the right metering unit are fixed on the outer wall of the right cylinder body (10), and the outer ends of the hollow roller shafts (21 and 22) of the right metering unit extend to be fixedly connected with the inner wall of the right shell (13) along the radial direction; the rollers (15, 16) of the left metering unit and the rollers (19, 20) of the right metering unit are sleeved on the hollow roller shafts (17, 18, 21, 22) in a one-to-one rotatable manner;
the guide rails (2 and 6) of the left metering unit are respectively and coaxially fixed at the left end and the right end of the left piston (5) outside the left cylinder body (4), and the guide rails (9 and 12) of the right metering unit are respectively and coaxially fixed at the left end and the right end of the right piston (11) outside the right cylinder body (10);
the rolling surfaces of the guide rails (2, 6) of the left metering unit and the guide rails (9, 12) of the right metering unit are both axial annular curved surfaces, the curved surfaces have axial fluctuation, the projections of the guide rails (2, 6, 9, 12) in the central axis direction are annular, the curved surfaces have 2 highest points (T1) and 2 lowest points (T2), the highest points (T1) and the lowest points (T2) are respectively positioned on two mutually perpendicular diameters of the circular ring, and the curved surfaces are respectively symmetrical according to the two diameters; the rollers (15, 16, 19, 20) roll on the rolling surfaces of the corresponding guide rails (2, 6, 9, 12) and push the left piston (5) and the right piston (11) to move along the axial direction; the inner ring side of the guide rails (2, 6, 9, 12) is higher than the outer ring side, the rollers (15, 16, 19, 20) are conical rollers, and the rolling surfaces of the rollers (15, 16, 19, 20) are matched with the rolling surfaces of the guide rails (2, 6, 9, 12);
two left axial through holes (B) and two left axial blind holes (H) are formed in the wall surface of the left shell (3), and the projections of the left axial through holes (B) and the left axial blind holes (H) on the cross section of the left shell (3) are alternately distributed at equal intervals along the circumference of the left shell (3); a left first window (D) is formed in the left axial through hole (B), and a left second window (G) is formed in the left axial blind hole (H); two right axial through holes (S) and two right axial blind holes (M) are formed in the wall surface of the right shell (13), and the projections of the right axial through holes (S) and the right axial blind holes (M) on the cross section of the right shell (13) are alternately distributed at equal intervals along the circumference of the right shell (13); a right first window (O) is formed in the right axial through hole (S), and a right second window (P) is formed in the right axial blind hole (M);
a pair of first axial connecting through holes (K) which are respectively used for communicating the left axial blind hole (H) and the right axial through hole (S) are formed in the middle shell (8), and a pair of second axial connecting through holes (J) which are respectively used for communicating the left axial through hole (B) and the right axial blind hole (M) are also formed in the middle shell (8);
the left cylinder body (4) is provided with two axisymmetric left third windows (E) communicated with the first left axial groove (a) or the first right axial groove (b), and the left cylinder body (4) is also provided with two axisymmetric left fourth windows (F) communicated with the first left axial groove (a) or the first right axial groove (b); and the projections of the left third window (E) and the left fourth window (F) on the cross section of the left cylinder body (4) are alternately distributed at equal intervals along the circumference of the left cylinder body (4); the right cylinder body (10) is provided with two axisymmetric right third windows (N) communicated with the second left axial groove (c) or the second right axial groove (d), and the right cylinder body (4) is also provided with two axisymmetric right fourth windows (Q) communicated with the second left axial groove (c) or the second right axial groove (d); the projections of the right third window (N) and the right fourth window (Q) on the cross section of the right cylinder body (10) are alternately distributed at equal intervals along the circumference of the right cylinder body (10); the hollow roller shafts (17, 18, 21 and 22) are communicated along the radial direction, the inner end of the hollow roller shaft (17) at the left end of the left metering unit is communicated with the left third window (E), and the outer end of the hollow roller shaft (17) at the left end of the left metering unit is communicated with the left first window (D); the inner end of the hollow roller shaft (18) at the right end of the left metering unit is communicated with the left fourth window (F), and the outer end of the hollow roller shaft (18) at the right end of the left metering unit is communicated with the left second window (G);
the inner end of the hollow roller shaft (21) at the left end of the right metering unit is communicated with the right third window (N), and the outer end of the hollow roller shaft (21) at the left end of the right metering unit is communicated with the right first window (O); the inner end of the hollow roller shaft (22) at the right end of the right metering unit is communicated with the right fourth window (Q), and the outer end of the hollow roller shaft (22) at the right end of the right metering unit is communicated with the right second window (P);
the liquid inlet, the left axial through hole (B), the left first window (D), the hollow roller shaft (17) positioned at the left end of the left metering unit and the left third window (E) are communicated in sequence to form a liquid inlet channel of the left metering unit; the left fourth window (F), the hollow roller shaft (18) positioned at the right end of the left metering unit, the left second window (G), the left axial blind hole (H), the first axial connecting through hole (K), the right axial through hole (S) and the liquid outlet are communicated in sequence to form a liquid outlet channel of the left metering unit;
the liquid inlet, the left axial through hole (B), the second axial connecting through hole (J), the right axial blind hole (M), the right second window (P), the hollow roller shaft (22) positioned at the right end of the right metering unit and the right fourth window (Q) are communicated in sequence to form a liquid inlet channel of the right metering unit; the right third window (N), the hollow roller shaft (21) positioned at the left end of the right metering unit, the right first window (O), the right axial through hole (S) and the liquid outlet are communicated in sequence to form a liquid outlet channel of the right metering unit;
the waveforms of the curved surface fluctuation of the guide rails (2 and 6) positioned at the two ends of the left piston (5) are mutually in phase; the curved surface undulation waveforms of the guide rails (9, 12) positioned at the two ends of the right piston (11) are in phase with each other;
the left metering unit and the right metering unit are arranged along the circumferential direction in a staggered mode of 45 degrees, namely: the left piston (5) and the right piston (11) are arranged in a staggered mode by 45 degrees along the circumferential direction, and the phase difference of the curved surface waveforms of the corresponding guide rails on the left piston (5) and the right piston (11) is 45 degrees;
the shifting fork sliding rod device comprises a shifting fork (25) and a sliding rod (26), the shifting fork (25) is fixed on a guide rail (9) at the left end of the right piston (11), and the sliding rod (26) is fixedly arranged on a guide rail (6) at the right end of the left piston (5); fork openings with openings towards the right in the axial direction are formed in the two sides of the shifting fork (25), the sliding rod (26) is arranged in the radial direction, the fork openings of the shifting fork (25) are clamped and sleeved on the sliding rod (26), the sliding rod (26) can slide along the fork openings of the shifting fork (25), and the shifting fork (25) and the sliding rod (26) can synchronously move in the axial direction and can rotate in the circumferential direction;
a Hall element (24) is arranged on the outer wall of the middle shell (8), magnetic steel (7) which is induced with the Hall element (24) is arranged in the middle shell (8), and a central processing unit receives a pulse electric signal sent by the Hall element (24) and calculates the flow according to the pulse electric signal;
the positions of the first left axial groove (a), the first right axial groove (b), the second left axial groove (c), the second right axial groove (D), the left first window (D), the left second window (G), the left third window (E), the left fourth window (F), the right first window (O), the right second window (P), the right third window (N), and the right fourth window (Q) have the following correspondence:
in a first state:
in the right metering unit, the measured liquid pushes the right piston (11) to move rightwards along the axial direction, and the right piston (11) is forced to rotate along the circumferential direction by a roller motion assembly on the right piston (11); said second left axial slot (c) being aligned with said right fourth window (Q), said second right axial slot (d) being aligned with said right third window (N); the second left chamber (L) is communicated with the second left groove (c) through a liquid inlet channel of the right metering unit, and the second right chamber (R) discharges liquid through a liquid outlet channel of the right metering unit and a second right groove (d);
in the left metering unit, the left piston (5) is driven by the right piston (11) to rotate along the circumferential direction, and the left piston (5) is forced to move leftwards along the axial direction by a roller motion assembly on the left piston (5); the first left axial groove (a) is not communicated with the left third window (E) and the left fourth window (F), and the first right axial groove (b) is not communicated with the left third window (E) and the left fourth window (F); the first left chamber (C) neither feeds nor drains, and the first right chamber (I) neither feeds nor drains;
in the second state:
in the left metering unit, the tested liquid pushes the left piston (5) to move leftwards along the axial direction, and the left piston (5) rotates along the circumferential direction under the force of a roller motion assembly on the left piston (5); said first left axial slot (a) being aligned with said left fourth window (F), said first right axial slot (b) being aligned with said left third window (E); the first right chamber (I) is fed with liquid through a liquid inlet channel of the left metering unit and the first right groove (b) which are communicated, and the first left chamber (C) discharges liquid through a liquid outlet channel of the left metering unit and the first left groove (a) which are communicated;
in the right metering unit, the right piston (11) is driven by the left piston (5) to rotate along the circumferential direction, and the right piston (11) is forced to move leftwards along the axial direction by a roller motion assembly on the right piston (11); the second left axial groove (c) is not communicated with the right third window (N) and the right fourth window (Q), and the second right axial groove (d) is not communicated with the right third window (N) and the right fourth window (Q); the second left chamber (L) neither feeds nor discharges liquid, and the second right chamber (R) neither feeds nor discharges liquid;
in the third state:
in the right metering unit, the measured liquid pushes the right piston (11) to move leftwards along the axial direction, and the right piston (11) moves along the circumferential direction under the force of a roller motion assembly on the right piston (11); said second left axial slot (c) being aligned with said right third window (N), said second right axial slot (d) being aligned with a right fourth window (Q); the second right chamber (R) is used for feeding liquid through a liquid inlet channel of the right metering unit and the second right groove (d) which are communicated, and the second left chamber (L) is used for discharging liquid through a liquid outlet channel of the right metering unit and the second left groove (c) which are communicated;
in the left metering unit, the left piston (5) is driven by the right piston (11) to rotate along the circumferential direction, and the left piston (5) is forced to move rightwards along the axial direction by a roller motion assembly on the left piston (5); the first left axial groove (a) is not communicated with the left third window (E) and the left fourth window (F), and the first right axial groove (b) is not communicated with the left third window (E) and the left fourth window (F); the first left chamber (C) neither feeds nor drains, and the first right chamber (I) neither feeds nor drains;
in the fourth state:
in the left metering unit, the tested liquid pushes the left piston (5) to move rightwards, and the left piston (5) rotates along the circumferential direction under the force of a roller motion assembly on the left piston (5); said first left axial slot (a) being aligned with said left third window (E) and said first right axial slot (b) being aligned with said left fourth window (F); the first left chamber (C) is communicated with the first left groove (a) through a liquid inlet channel of the left metering unit, and the first right chamber (I) is communicated with the liquid outlet channel of the left metering unit through a first right groove (b);
in the right metering unit, the right piston (11) is driven by the left piston (5) to rotate along the circumferential direction, and the right piston (11) is forced to move to the right along the axial direction by a roller motion assembly on the right piston (11); the second left axial groove (c) is not communicated with the right third window (N) and the right fourth window (Q), and the second right axial groove (d) is not communicated with the right third window (N) and the right fourth window (Q); the second left chamber (L) neither feeds nor discharges liquid, and the second right chamber (R) neither feeds nor discharges liquid;
first sealing components are respectively arranged between the two ends of the first axial connecting through hole (K) and the left axial blind hole (H) and the right axial through hole (S); second sealing components are respectively arranged between the two ends of the second axial connecting through hole (J) and the left axial through hole (B) and the right axial blind hole (M);
the hollow roller shafts (17, 18, 21 and 22) are fixedly connected with the left shell (3) or the right shell (13) through bolts respectively, and third sealing members are arranged between the hollow roller shafts (17, 18, 21 and 22) and the left shell (3) or the right shell (13) respectively.
2. The movable rail type flowmeter according to claim 1, wherein: the first seal member, the second seal member, and the third seal member are seal rings.
3. The movable rail type flowmeter according to claim 1, wherein: the left shell (3) and the right shell (13) are fixedly connected with the middle shell (8) through bolts respectively.
4. The movable rail type flowmeter according to claim 1, wherein: the left end cover (1) and the left shell (3) and the right end cover (14) and the right shell (13) are fixed through bolts respectively.
5. The movable rail type flowmeter according to claim 1, wherein: the rollers (15, 16, 19, 20) are rotatably mounted on the hollow roller shafts (17, 18, 21, 22) by means of bearings.
6. The movable rail type flowmeter according to claim 1, wherein: the widths of the left first window (D), the left second window (G), the left third window (E), the left fourth window (F), the right first window (O), the right second window (P), the right third window (N), the right fourth window (Q), the first left axial groove (a), the first right axial groove (b), the second left axial groove (c) and the second right axial groove (D) in the circumferential direction are the same; and the radian of the left third window (E), the left fourth window (F), the right third window (N), the right fourth window (Q), the first left axial groove (a), the first right axial groove (b), the second left axial groove (c) and the second right axial groove (d) along the circumferential direction is 45 degrees.
7. The movable rail type flowmeter according to claim 1, wherein: two communicate through left first radial spread groove between first left axial groove (a), two communicate through left second radial spread groove between first right axial groove (b), just left side first radial spread groove with left side second radial spread groove all follows radial interval sets up in left side piston (5).
8. The movable rail type flowmeter according to claim 1, wherein: two communicate through the first radial spread groove in the right side between the left axial groove of second (c), two communicate through the radial spread groove in the right side second between the right axial groove of second (d), just the first radial spread groove in the right side with the radial spread groove in the right side second is all followed radial interval sets up in the right piston (11).
9. The movable rail type flowmeter according to claim 1, wherein: the sliding rod (26) is coaxially and rotatably sleeved with a rolling body (27), and a fork opening of the shifting fork (25) is connected with the sliding rod (26) through the rolling body (27).
CN201811599460.5A 2018-12-26 2018-12-26 Movable guide rail type flowmeter Pending CN111366206A (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113324607A (en) * 2021-05-27 2021-08-31 浙江工业大学 Two-dimensional piston type dynamic flow meter
CN113324606A (en) * 2021-05-27 2021-08-31 浙江工业大学 Fold and roll type pair two dimension piston dynamic flowmeter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388835A (en) * 1979-08-20 1983-06-21 Universal Flow Monitors Fluid flow meter
CN208075953U (en) * 2018-04-08 2018-11-09 浙江工业大学 Duplex two dimension piston-type flow-meter
CN209512951U (en) * 2018-12-26 2019-10-18 浙江工业大学 A kind of movable guiding rail type flowmeter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388835A (en) * 1979-08-20 1983-06-21 Universal Flow Monitors Fluid flow meter
CN208075953U (en) * 2018-04-08 2018-11-09 浙江工业大学 Duplex two dimension piston-type flow-meter
CN209512951U (en) * 2018-12-26 2019-10-18 浙江工业大学 A kind of movable guiding rail type flowmeter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113324607A (en) * 2021-05-27 2021-08-31 浙江工业大学 Two-dimensional piston type dynamic flow meter
CN113324606A (en) * 2021-05-27 2021-08-31 浙江工业大学 Fold and roll type pair two dimension piston dynamic flowmeter
CN113324606B (en) * 2021-05-27 2022-03-25 浙江工业大学 Fold and roll type pair two dimension piston dynamic flowmeter

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