CN206583492U - Pipeline more changing device and flow meter assembly - Google Patents
Pipeline more changing device and flow meter assembly Download PDFInfo
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- CN206583492U CN206583492U CN201621452236.XU CN201621452236U CN206583492U CN 206583492 U CN206583492 U CN 206583492U CN 201621452236 U CN201621452236 U CN 201621452236U CN 206583492 U CN206583492 U CN 206583492U
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Abstract
The utility model discloses a kind of pipeline more changing device and flow meter assembly, it is related to gas-liquid two-phase fluid flow measurement technology field, to alleviate existing flowmeter in use, because virtual height phenomenon easily causes error, and because larynx footpath ratio can not be adjusted, so as to cause the small technical problem of measurement range.Pipeline described in the utility model more changing device, including：Rotating shaft, is arranged on rotating shaft two ends and the rotating disk being coaxially disposed with rotating shaft, and is arranged on multiple larynx footpaths in the middle of two rotating disks than different Venturi tubes；The axle center of multiple Venturi tubes is equal apart from the distance of rotating shaft core；The multiple Venturi tubes of correspondence offer multiple through holes on two rotating disks；Trunnion position is provided with fluid issuing in multiple Venturi tubes, and fluid issuing outer sheath is provided with first annular pressure measuring cavity.The utility model is mainly used in the measurement process of gas-liquid two-phase fluid flow.
Description
Technical field
The utility model is related to gas-liquid two-phase fluid flow measurement technology field, is changed in particular to a kind of pipeline
Device and flow meter assembly.
Background technology
Biphase gas and liquid flow refers to that the fluid of flowing in pipeline has two different phases, is gas phase and liquid phase respectively, gas or
Flowing law is essentially identical when liquid individually flows, and all defers to the continuity equation and Bernoulli equation of fluid, but when them
When existing jointly and flowing simultaneously, because there is larger difference in the dielectric property of two-phase fluid so that the flowing of gas-liquid two-phase
It is increasingly complex compared with single-phase flow, in recent decades, with petroleum gas engineering, Chemical Engineering, metallurgical engineering, nuclear reaction work
The fields such as journey, Aerospace Engineering are developed rapidly, the also more and more higher of the requirement to the e measurement technology of biphase gas and liquid flow flow.
The measuring method to biphase gas and liquid flow mainly includes two kinds in the prior art：Partition method and non-partition method are traditional
Partition method is generally used for measuring station, and equipment is huge, and cost is high, therefore non-partition method, non-partition method are mainly used in practical application
Refer to that two phase flow need not be carried out the separation of any degree, by measuring system direct measurement two phase flow, wherein, differential pressure type section
Stream device be industrial quarters and academia generally acknowledge under the various fluidised forms of two phase flow can steady operation a kind of throttling arrangement, be
The first choice of non-separation measurement apparatus.Differential pressure type throttling arrangement typically uses Venturi tube, according to Venturi effect, utilizes entrance
The flow of fluid is calculated with the pressure difference of trunnion section, but differential pressure type throttling arrangement is used for two-phase flow measurement as single-phase meters
When, there is the virtual height phenomenon of reading due to the introducing of liquid phase, can be in Venturi tube in order to overcome the error that virtual height phenomenon is brought
Contraction section and trunnion section on respectively annular multiple fluid issuings are set, and be arranged ring-shaped air chamber outside multiple fluid issuings, lead to
Overpressure difference transmitter connects two ring-shaped air chambers, you can measure the pressure difference value of contraction section and trunnion section, and then calculates gas-liquid
The flow of two phase flow.
However, present inventor has found, (d/D- wherein d are trunnion for flow measurement range and the larynx footpath ratio of Venturi tube
Diameter, D be entrance diameter) it is closely related, larynx footpath ratio once it is determined that, the measurement range of Venturi tube is also determined therewith, but
In practice, gas-liquid two-phase fluid to be measured is in its life cycle, and it is (such as marine to bore that often great changes will take place for flow
Well platform, oil well etc.), or need to measure the two-phase flow in different pipelines using a flowmeter, using existing
Flowmeter in technology can not meet above-mentioned requirements.
Utility model content
The purpose of this utility model is to provide a kind of pipeline more changing device and flow meter assembly, to alleviate existing flow
Count in use, because virtual height phenomenon easily causes error, and because larynx footpath ratio can not be adjusted, so as to cause to measure model
Enclose small technical problem.
The utility model provides a kind of pipeline more changing device, including：Rotating shaft, be arranged on rotating shaft two ends and with the rotating shaft
The rotating disk being coaxially disposed, and multiple larynx footpaths in the middle of two rotating disks are arranged on than different Venturi tubes；It is multiple described
The axle center of Venturi tube is equal apart from the distance of the rotating shaft core；The multiple Venturi tubes of correspondence are opened on two rotating disks
Provided with multiple through holes；Trunnion position is provided with the outside of fluid issuing, and the fluid issuing and is arranged in multiple Venturi tubes
There is first annular pressure measuring cavity.
Wherein, annular groove, the annular groove and multiple Venturi tubes point are provided with two rotating disks
The both sides of the rotating disk are not arranged on, and the annular groove is arranged concentrically with the rotating disk, the width point of the annular groove
Not great Yu each through hole aperture.
Specifically, the rotating disk is to be detachably connected with the Venturi tube.
Further, it is provided with balancing weight on the rotating disk.
During practical application, the tube wall external diameter of the Venturi tube is equal everywhere, and pipe wall internal diameters are along two-phase fluid flowing side
To being first gradually reduced, gradually increase again.
Relative to prior art, the pipeline more changing device that the utility model is provided has the advantage that：
In the pipeline more changing device that the utility model is provided, including：Rotating shaft, is arranged on rotating shaft two ends and coaxial with rotating shaft
The rotating disk of setting, and multiple larynx footpaths in the middle of two rotating disks are arranged on than different Venturi tubes；The axle of multiple Venturi tubes
The heart is equal apart from the distance of rotating shaft core；The multiple Venturi tubes of correspondence offer multiple through holes on two rotating disks；Multiple venturi
Trunnion position is provided with fluid issuing in pipe, and fluid issuing outer sheath is provided with first annular pressure measuring cavity.Thus analysis is understood, is made
The pipeline provided with the utility model more changing device, selects suitable venturi according to the flow of current biphase gas and liquid flow first
In pipe, and the pipeline that the utility model is provided more changing device access pipeline to be measured, when the flow of biphase gas and liquid flow occurs
Change, beyond current Venturi tube measurement range when, rotating shaft so as to drive rotating disk to rotate, is possible to adapt to work as
The larynx footpath of preceding flow than Venturi tube change pipeline in, due to multiple Venturi tubes axle center apart from the axle center of rotating shaft distance
It is equal, therefore in the case where two Venturi tube startings are equal with the internal diameter of termination, the Venturi tube after replacing also can
Coordinate with pipeline to be measured, and through hole is offered due to corresponding to Venturi tube position on rotating disk, therefore rotated in rotating disk
Cheng Zhong, rotating disk card can play a part of temporarily sealing to pipeline, it is to avoid gas-liquid two-phase fluid is revealed；Due to Venturi tube larynx
Pipe position sets fluid issuing, and fluid issuing outer sheath is provided with first annular pressure measuring cavity, when biphase gas and liquid flow is from fluid issuing
Place is injected after first annular pressure measuring cavity, as ambient parameter changes (in the gas-liquid ratio and trunnion in first annular pressure measuring cavity not
Together), gas-liquid separation, thus alleviate liquid phase fluid to differential pressure throttle device band come reading virtual height phenomenon (after gas-liquid separation, gas
Body is gathered at the top of first annular pressure measuring cavity, liquid accumulation to first annular pressure measuring cavity bottom, and liquid is not easily accessed pressure difference change
Send in device), therefore the pipeline more changing device provided using the utility model, existing flowmeter can be alleviated and using process
In, because virtual height phenomenon easily causes error, and because larynx footpath ratio can not be adjusted, so that the technology for causing measurement range small is asked
Topic.
The utility model also provides a kind of flowmeter, including：The pipeline that entrance, the utility model set gradually is provided
More changing device and outlet section；It is provided with the entrance outside the fluid issuing, and the fluid issuing and is arranged with second
Annular pressure measuring cavity；Pressure difference transmitter is provided with the entrance, and the first annular pressure measuring cavity and second annular are surveyed
Pressure chamber passes through soft pipe connection with the pressure difference transmitter.
During practical application, the fluid issuing on the fluid issuing and the trunnion of the entrance is many
It is individual, and multiple fluid issuings be uniformly circumferentially positioned at respectively on the entrance and the trunnion on.
Wherein, the top of the first annular pressure measuring cavity and the second annular pressure measuring cavity is provided with pressure tap, described
Distance is left between pressure tap and flexible pipe connection, and the plane of the pressure tap and multiple fluid issuing compositions.
Specifically, the bottom of the first annular pressure measuring cavity and the second annular pressure measuring cavity is provided with sewage draining exit.
During practical application, the rotating shaft can Double-directional rotary, and either direction rotational angle be no more than 180 degree.
The flow meter assembly had the advantage that with above-mentioned pipeline more changing device relative to prior art it is identical, herein not
Repeat again.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that, describe below
In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.
The dimensional structure diagram for the pipeline more changing device that Fig. 1 provides for the present embodiment；
The schematic front view for the pipeline more changing device that Fig. 2 provides for the present embodiment；
The dimensional structure diagram for the flow meter assembly that Fig. 3 provides for the present embodiment；
The schematic cross-sectional view for the flow meter assembly that Fig. 4 provides for the present embodiment；
Fig. 5 is part A partial enlarged drawing in Fig. 4；
Fig. 6 is B-B directions schematic cross-sectional view in Fig. 5；
Fig. 7 be multiple different larynx footpaths than Venturi tube comparison diagram.
Icon：10- rotating shafts；20- rotating disks；21- through holes；22- annular grooves；30- Venturi tubes；31- contraction sections；
32- trunnions；321- fluid issuings；33- expansion segments；The first annular pressure measuring cavities of 34-；40- entrances；The annulars of 41- second
Pressure measuring cavity；42- pressure difference transmitters；50- outlet sections；60- flexible pipes；70- pressure taps；80- sewage draining exits.
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is a part of embodiment of the utility model, rather than whole embodiments.Based on the embodiment in the utility model, sheet
The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality
Novel protected scope.
, it is necessary to explanation in description of the present utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular
Directly ", the orientation or position relationship of the instruction such as " level ", " interior ", " outer " are, based on orientation shown in the drawings or position relationship, to be only
Described for the ease of description the utility model and simplifying, rather than to indicate or imply that signified device or element must have specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.In addition, term " the
One ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that indicating or implying relative importance.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the utility model.
The utility model embodiment provides a kind of pipeline more changing device, as shown in Figure 1, Figure 2, shown in Fig. 6 and Fig. 7, including：Rotating shaft
10, the rotating disk 20 for being arranged on the two ends of rotating shaft 10 and being coaxially disposed with rotating shaft 10, and be arranged on multiple in the middle of two rotating disks 20
Larynx footpath is than different Venturi tubes 30；The distance in axle center of the axle center of multiple Venturi tubes 30 apart from rotating shaft 10 is equal；Two turn
The multiple Venturi tubes 30 of correspondence offer multiple through holes 21 on disk 20；The position of trunnion 32 is provided with fluid in multiple Venturi tubes 30
Outlet 321, and the outer sheath of fluid issuing 321 is provided with first annular pressure measuring cavity 34.
Relative to prior art, the pipeline more changing device that the utility model embodiment is provided has the advantage that：
In the pipeline more changing device that the utility model embodiment is provided, as shown in Figure 1, Figure 2, shown in Fig. 6 and Fig. 7, including：Rotating shaft
10, the rotating disk 20 for being arranged on the two ends of rotating shaft 10 and being coaxially disposed with rotating shaft 10, and be arranged on multiple in the middle of two rotating disks 20
Larynx footpath is than different Venturi tubes 30；The distance in axle center of the axle center of multiple Venturi tubes 30 apart from rotating shaft 10 is equal；Two turn
The multiple Venturi tubes 30 of correspondence offer multiple through holes 21 on disk 20；The position of trunnion 32 is provided with fluid in multiple Venturi tubes 30
Outlet 321, and the outer sheath of fluid issuing 321 is provided with first annular pressure measuring cavity 34.Thus analysis is understood, real using the utility model
The pipeline more changing device of example offer is provided, suitable Venturi tube 30 is selected according to the flow of current biphase gas and liquid flow first, and
The pipeline that the utility model embodiment is provided more changing device access in pipeline to be measured (will suitably Venturi tube 30 and
Entrance 40 and outlet section 50 are connected), when the flow of biphase gas and liquid flow changes, beyond the survey of current Venturi tube 30
When measuring scope, rotating shaft 10, so as to drive rotating disk 20 to rotate, be possible to adapt to the larynx footpath of present flow rate than Venturi tube 30
Change in pipeline, because the distance in axle center of the axle center apart from rotating shaft 10 of multiple Venturi tubes 30 is equal, therefore on two literary mounds
In pipe 30 starting it is equal with the internal diameter of termination in the case of, the Venturi tube 30 after replacing can also match somebody with somebody with pipeline to be measured
Close, and through hole 21 is offered due to corresponding to the position of Venturi tube 30 on rotating disk 20, therefore in the rotation process of rotating disk 20, rotating disk
20 cards can play a part of temporarily sealing to pipeline, it is to avoid gas-liquid two-phase fluid is revealed；Due to the trunnion of Venturi tube 30
32 positions set fluid issuing 321, and the outer sheath of fluid issuing 321 be provided with first annular pressure measuring cavity 34, when biphase gas and liquid flow from
Injected at fluid issuing 321 after first annular pressure measuring cavity 34, as ambient parameter changes the (gas-liquid in first annular pressure measuring cavity 34
Ratio is different from trunnion 32), gas-liquid separation shows so as to alleviate liquid phase fluid to the reading virtual height that differential pressure throttle device band is come
As (after gas-liquid separation, air accumulation to the top of first annular pressure measuring cavity 34, liquid accumulation to the first annular bottom of pressure measuring cavity 34,
Liquid is not easily accessed in pressure difference transmitter 42, and the pressure in first annular pressure measuring cavity 34 passes through fluid issuing 321 and larynx
Pressure in pipe 32 is consistent), therefore the pipeline more changing device provided using the utility model embodiment, it can alleviate existing
Flowmeter in use, because virtual height phenomenon easily causes error, and because larynx footpath ratio can not be adjusted, so as to cause
The small technical problem of measurement range.
Herein it should be added that, in practical application, the clutch end of the center of rotating disk 20 and motor can be connected
Connect, by the rotating of motor power output end, realize the Double-directional rotary of rotating disk 20.
In addition, during practical application, also one in the Venturi tube 30 in the middle of two rotating disks 20 can be replaced with into common circle
Pipe, and the internal diameter of pipe is equal with the internal diameter of entrance 40 or outlet section 50, when the flow of gas-liquid two-phase fluid need not be measured,
Pipe is accessed between entrance 40 and outlet section 50, so as to eliminate the limitation of the semiconvection of 30 trunnion of Venturi tube 32 speed, made
Gas-liquid two-phase fluid flows more smooth in the case where that need not measure flow.
In addition, whether currently used Venturi tube 30 can accurately measure the flow of current gas-liquid two-phase fluid, Ke Yicong
Estimation is drawn in measurement result, if measurement result substantial deviation empirical value (estimated flow i.e. under current flow etc.), you can sentence
The flow of disconnected current gas-liquid two-phase fluid is not suitable for measuring, it is necessary to according to measurement result using currently used Venturi tube 30
With the difference of empirical value, selection larynx footpath is than greater or lesser Venturi tube 30.
Wherein, during in order to ensure that rotating disk 20 is rotated, the cooperation of entrance 40 and outlet section 50 and rotating disk 20 is tighter
It is close, as Figure 1-Figure 4, annular groove 22, annular groove 22 and multiple 30 points of Venturi tubes are provided with two rotating disks 20
The both sides of rotating disk 20 are not arranged on, and annular groove 22 is arranged concentrically with rotating disk 20, the width of annular groove 22 is respectively greater than often
The aperture of individual through hole 21, and equal to entrance 40 or the external diameter of the pipeline of outlet section 50, during rotating disk 20 is rotated, annular is recessed
The outer wall of the inwall of groove 22 and entrance 40 or the pipeline of outlet section 50 is brought into close contact, and because annular groove 22 and rotating disk 20 are same
The heart is set, so that it is guaranteed that when rotating disk 20 turns to correct position, entrance 40 or the pipeline of outlet section 50 can with rotating disk 20
Through hole 21 is corresponding.
Specifically, in order to increase the utility model embodiment offer pipeline more changing device the scope of application, rotating disk 20 with
Venturi tube 30 is is detachably connected, and in actual applications, the external diameter of entrance 40 and the pipeline of outlet section 50 is varied, and
The model for the Venturi tube 30 that can be adapted with various gas-liquid two-phase fluids also has many kinds, in order to meet various use bars
Part, rotating disk 20 is set to be detachably connected with Venturi tube 30, for example：When the external diameter of the pipeline of entrance 40 be slightly less than annular it is recessed
During the width of groove 22, the corresponding rotating disk 20 of the pipeline of entrance 40 can be individually replaced, or find existing Venturi tube 30
The flow of current gas-liquid two-phase fluid can not be measured, individually can be dismantled down Venturi tube 30, suitable venturi is changed
Pipe 30.
Herein it should be added that, the connected mode of rotating disk 20 and Venturi tube 30 has a variety of, can for screw thread connect
Connect, bolt connection or clamping etc., it is any can guarantee that it is steady between Venturi tube 30 and rotating disk 20 during rotating disk 20 is rotated
Admittedly the connected mode coordinated.
Further, balancing weight is provided with the rotary inertia in the rotation process of rotating disk 20, rotating disk 20 in order to reduce, in reality
In the application of border, because the quality of each Venturi tube 30 is different, during rotating disk 20 is rotated, because the present embodiment is carried
The overall barycenter of the pipeline of confession more changing device is not on the center line of rotating shaft 10, so that the pipeline for causing the present embodiment to provide is changed
Device, due to effect of inertia, causes radial impact, after long-term use, easily during rotation to the clutch end of motor
Motor is damaged, in order to alleviate this case, balancing weight is set on rotating disk 20, it is therefore intended that makes the pipeline that the present embodiment is provided more
The overall center of gravity of changing device falls the center line closer to rotating shaft 10, so that reduce rotary inertia when rotating disk 20 is rotated, extension electricity
The service life of machine.
During practical application, in order to extend the service life of Venturi tube 30, as shown in Fig. 4, Fig. 7, outside Venturi tube 30
Tube wall diameter is equal everywhere, and inner tubal wall diameter is first gradually reduced along two-phase fluid flow direction, gradually increased again, traditional text
Venturi 30 is typically using group weldering form, and pipe thickness is basically identical everywhere, when the fluid flow in Venturi tube 30 is very big,
Fluid constantly impacts tube wall, situations such as easily causing weld cracking seepage, and due to the length diameter ratio of Venturi tube 30
Generally large, in the presence of self gravitation, the middle part of Venturi tube 30 is easily bent, in order to alleviate above-mentioned situation, will
Venturi tube 30 sets and is structure as a whole, and tube wall external diameter is identical everywhere, so as to ensure the intensity of Venturi tube 30, extends and uses
Life-span.
Herein it should be added that, the processing method of the Venturi tube 30 of such a structure has a variety of, for example：It can be used
Lathe first drills, and reuses lathe tool reaming, aperture is slightly less than the diameter of trunnion 32, then processes cone-shaped inner hole using lathe tool,
I.e. Each part in Venturi tube 30, is finally processed into by the general shape of contraction section 31 and expansion segment 33 using fine cut lathe tool
Type, the processing technology of Venturi tube 30 be not limited to it is such a, it is any to process the processing technology of said structure.
The utility model embodiment also provides a kind of flow meter assembly, as Figure 3-Figure 4, including：What is set gradually enters
Pipeline more changing device and outlet section 50 that mouth section 40, the utility model embodiment are provided；Fluid is provided with entrance 40 to go out
The second annular pressure measuring cavity 41 is arranged with outside mouth 321, and fluid issuing 321；Pressure difference transmitter 42, and are provided with entrance 40
The one annular annular pressure measuring cavity 41 of pressure measuring cavity 34 and second is connected with pressure difference transmitter 42 by flexible pipe 60.
Relative to prior art, the flow meter assembly that the utility model embodiment is provided has the advantage that：
In the flow meter assembly that the utility model embodiment is provided, such as scheme as Figure 3-Figure 4, including：Set gradually
Pipeline more changing device and outlet section 50 that entrance 40, the utility model embodiment are provided；Fluid is provided with entrance 40
The second annular pressure measuring cavity 41 is arranged with outside outlet 321, and fluid issuing 321；Pressure difference transmitter 42 is provided with entrance 40, and
The first annular annular pressure measuring cavity 41 of pressure measuring cavity 34 and second is connected with pressure difference transmitter 42 by flexible pipe 60.Thus analysis is understood,
The flow meter assembly provided using the utility model embodiment, selects suitable according to the flow of current biphase gas and liquid flow first
(will be suitable in Venturi tube 30, and the pipeline that the utility model embodiment is provided more changing device access pipeline to be measured
Venturi tube 30 be connected with entrance 40 and outlet section 50), when the flow of biphase gas and liquid flow changes, beyond current
During the measurement range of Venturi tube 30, rotating shaft 10, so as to drive rotating disk 20 to rotate, is possible to adapt to the larynx footpath of present flow rate
In the change pipeline of Venturi tube 30 of ratio, because the distance in axle center of the axle center apart from rotating shaft 10 of multiple Venturi tubes 30 is equal,
Therefore in the case where the starting of two Venturi tubes 30 is equal with the internal diameter of termination, Venturi tube 30 after replacing also can be with
Pipeline to be measured coordinates, and offers through hole 21 due to corresponding to the position of Venturi tube 30 on rotating disk 20, therefore in rotating disk 20
In rotation process, the card of rotating disk 20 can play a part of temporarily sealing to pipeline, it is to avoid gas-liquid two-phase fluid is revealed；Due to text
The position of trunnion 32 of venturi 30 and entrance 40 are respectively provided with fluid issuing 321, and the outer sheath of fluid issuing 321 is provided with the
The one annular annular pressure measuring cavity 41 of pressure measuring cavity 34 or second, when biphase gas and liquid flow injects first annular pressure measurement at fluid issuing 321
After the annular pressure measuring cavity 41 of chamber 34 or second, as ambient parameter changes (the first annular annular pressure measuring cavity of pressure measuring cavity 34 and second
Gas-liquid ratio in 41 is different from trunnion 32), gas-liquid separation, so as to alleviate what liquid phase fluid came to differential pressure throttle device band
Reading virtual height phenomenon, the pressure differential of the annular pressure measuring cavity 41 of first annular pressure measuring cavity 34 and second is measured by pressure difference transmitter 42
Value, so as to calculate the flow for obtaining gas-liquid two-phase fluid, and due to pressure difference transmitter 42 and first annular pressure measuring cavity 34 and
Connected between second annular pressure measuring cavity 41 by flexible pipe 60, therefore during rotating disk 20 is rotated, because flexible pipe 60 has one
Fixed flexible and ductility, so as to avoid due to pressure difference transmitter 42 and the first annular ring of pressure measuring cavity 34 and second
The situation that distance and relative position change and cause pipeline to break or bend between shape pressure measuring cavity 41 occurs, therefore uses this
The flow meter assembly that utility model embodiment is provided, can alleviate existing flowmeter in use, due to virtual height phenomenon
Easily cause error, and because larynx footpath ratio can not be adjusted, so as to cause the small technical problem of measurement range.
Herein it should be added that, the two ends for many flexible pipes 60 being connected with multiple first annular pressure measuring cavities 34 are all provided with
Magnetic valve is equipped with, when rotating disk 20 is rotated, magnetic valve is turned off, after rotating disk 20 stops, being connected with entrance 40 and outlet section 50
The magnetic valve at the two ends of flexible pipe 60 connected on the corresponding first annular pressure measuring cavity 34 of logical Venturi tube 30 is opened, remaining flexible pipe 60
The magnetic valve at two ends is turned off, so as to ensure that the accuracy of measurement.
In addition, magnetic valve can also be turned on and off by user's manual control, for example, in the case of without measurement, can
It is artificial to close magnetic valve, when needing measurement flow, then artificial opens solenoid valve, so as to realize the timing to gas-liquid two-phase fluid
Measurement.
Also need to supplementary notes herein, if the average speed of gas-liquid two-phase fluid in entrance 40, average pressure and
Sectional area is respectively v1、p1、S1, average speed, average pressure and the sectional area of gas-liquid two-phase fluid are respectively v in trunnion 322、
p2、S2, the density of gas-liquid two-phase fluid is ρ, and flow is represented with Q, using Bernoulli's theorem and continuity equation, can be drawn：
S1v1=S2v2=Q
It can thus be concluded that calculating flow Q formula：
Therefore ρ, S are being known1、S2In the case of, measure p1- p2After (i.e. the pressure difference value of entrance 40 and trunnion 32),
Flow Q can be obtained according to above formula.
In addition, flexible pipe 60 can select metal hose, metal hose is less susceptible to bend, so that the flow of fluid in pipe
It is more unobstructed, so that measurement result is more accurate.
During practical application, in order to accelerate the gas-liquid dynamic equilibrium in the annular pressure measuring cavity 41 of first annular pressure measuring cavity 34 and second
Process, as shown in fig. 6, the fluid issuing 321 on the fluid issuing 321 and trunnion 32 of entrance 40 is multiple, and multiple streams
Body outlet 321 is uniformly circumferentially positioned on entrance 40 with trunnion 32 respectively, is set using such a, it is possible to increase gas-liquid is isolated
Efficiency, and then improve pressure measurement information stability in gas-liquid two-phase fluid.
Wherein, in order to further reduce interference of the liquid phase to pressure measurement result, as shown in figure 5, the He of first annular pressure measuring cavity 34
The top of second annular pressure measuring cavity 41 is provided with pressure tap 70, and pressure tap 70 and flexible pipe 60 are connected, and pressure tap 70 with it is multiple
Distance is left between the plane that fluid issuing 321 is constituted, is set using such a, gas-liquid two-phase fluid can be reduced from fluid issuing
During 321 injection, the probability in pressure tap 70 is emitted directly toward, so that further interference of the introducing of reduction liquid phase to pressure measurement result,
Make measurement result more accurate.
Specifically, for the timely stream by the annular pressure measuring cavity 41 of first annular pressure measuring cavity 34 and second in measurement process
Body is discharged, as shown in figure 5, the bottom of the annular pressure measuring cavity 41 of first annular pressure measuring cavity 34 and second is provided with sewage draining exit 80,
In measurement process, because the fluid in pipeline can be projected by fluid issuing 321, and first annular pressure measuring cavity 34 and second is retained in
In the chamber of annular pressure measuring cavity 41, after long-term use, lost in the chamber of the first annular annular pressure measuring cavity 41 of pressure measuring cavity 34 and second
Leave substantial amounts of fluid, the accuracy of meeting severe jamming measurement result, in order to alleviate this case, in first annular pressure measuring cavity 34
Set respectively with the bottom of the second annular pressure measuring cavity 41 and be provided with magnetic valve at sewage draining exit 80, sewage draining exit 80, in one-shot measurement mistake
After journey terminates, magnetic valve is opened, and the fluid in the chamber of the annular pressure measuring cavity 41 of first annular pressure measuring cavity 34 and second is discharged, from
And reduce the interference to next measurement result.
During practical application, in order to reduce the probability that flexible pipe 60 is pulled off, rotating shaft 10 being capable of Double-directional rotary, and either direction
Rotational angle is no more than 180 degree, if rotating shaft 10 can only one-directional rotation, after multiple Venturi tube 30 is changed, what rotating shaft 10 was turned over
Angle is excessive, and flexible pipe 60 can be entangled in the outer surface of multiple Venturi tubes 30, not only results in the overflexing of flexible pipe 60, causes fluid
Flowing is not smooth, or even easily causes flexible pipe 60 and break, in order to reduce above-mentioned situation odds, the rotational angle of countershaft 10
It is any limitation as, so as to extend the service life of flexible pipe 60.
Finally it should be noted that：Various embodiments above is only limited to illustrate the technical solution of the utility model, rather than to it
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, or to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (10)
1. a kind of pipeline more changing device, it is characterised in that including：Rotating shaft, is arranged on rotating shaft two ends and is coaxially set with the rotating shaft
The rotating disk put, and multiple larynx footpaths in the middle of two rotating disks are arranged on than different Venturi tubes；
The distance in axle center of the axle center of multiple Venturi tubes apart from the rotating shaft is equal；
The multiple Venturi tubes of correspondence offer multiple through holes on two rotating disks；
Trunnion position is provided with fluid issuing in multiple Venturi tubes, and the fluid issuing outer sheath is provided with first annular
Pressure measuring cavity.
2. pipeline according to claim 1 more changing device, it is characterised in that annular is provided with two rotating disks recessed
Groove, the annular groove is separately positioned on the both sides of the rotating disk, and the annular groove and institute with multiple Venturi tubes
State rotating disk to be arranged concentrically, the width of the annular groove is respectively greater than the aperture of each through hole.
3. pipeline according to claim 2 more changing device, it is characterised in that the rotating disk is removable with the Venturi tube
Unload connection.
4. pipeline according to claim 3 more changing device, it is characterised in that be provided with balancing weight on the rotating disk.
5. pipeline according to claim 1 more changing device, it is characterised in that the tube wall external diameter of the Venturi tube is equal everywhere
Equal, pipe wall internal diameters are first gradually reduced along two-phase fluid flow direction, gradually increased again.
6. a kind of flow meter assembly, it is characterised in that including：It is any in the entrance that sets gradually, the claims 1-5
Pipeline more changing device and outlet section described in；
It is provided with the entrance outside the fluid issuing, and the fluid issuing and is arranged with the second annular pressure measuring cavity；
Pressure difference transmitter, and the first annular pressure measuring cavity and the second annular pressure measuring cavity and institute are provided with the entrance
State pressure difference transmitter and pass through soft pipe connection.
7. flow meter assembly according to claim 6, it is characterised in that the fluid issuing of the entrance and described
The fluid issuing on trunnion is multiple, and multiple fluid issuings are uniformly circumferentially positioned on the entrance respectively
On the trunnion.
8. flow meter assembly according to claim 7, it is characterised in that the first annular pressure measuring cavity and second ring
The top of shape pressure measuring cavity is provided with pressure tap, the pressure tap and flexible pipe connection, and the pressure tap with it is multiple described
Distance is left between the plane that fluid issuing is constituted.
9. flow meter assembly according to claim 8, it is characterised in that the first annular pressure measuring cavity and second ring
The bottom of shape pressure measuring cavity is provided with sewage draining exit.
10. flow meter assembly according to claim 9, it is characterised in that rotating shaft being capable of Double-directional rotary, and either direction
Rotational angle is no more than 180 degree.
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| CN201621452236.XU CN206583492U (en) | 2016-12-28 | 2016-12-28 | Pipeline more changing device and flow meter assembly |
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| CN201621452236.XU CN206583492U (en) | 2016-12-28 | 2016-12-28 | Pipeline more changing device and flow meter assembly |
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| CN206583492U true CN206583492U (en) | 2017-10-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113720389A (en) * | 2021-08-31 | 2021-11-30 | 苏州大学 | Dyeing hydromechanics measuring device is pressed in area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113720389A (en) * | 2021-08-31 | 2021-11-30 | 苏州大学 | Dyeing hydromechanics measuring device is pressed in area |
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