CN104061972B - Ultrasonic liquid flow measurement device - Google Patents
Ultrasonic liquid flow measurement device Download PDFInfo
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- CN104061972B CN104061972B CN201310688359.8A CN201310688359A CN104061972B CN 104061972 B CN104061972 B CN 104061972B CN 201310688359 A CN201310688359 A CN 201310688359A CN 104061972 B CN104061972 B CN 104061972B
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Abstract
The invention discloses an ultrasonic liquid flow measurement device, belongs to the technical field of liquid flow defection and aims at providing the ultrasonic liquid flow measurement device which can change the reflection and diffraction propagation directions of divergent waves surrounding a main beam and decrease the absorption amount of the divergent waves by an ultrasonic probe, can pile up a certain amount of sediments, cannot generate diffuse reflection, and thus can greatly improve the liquid flow measurement accuracy. The ultrasonic liquid flow measurement device comprises a straight measuring tube and an ultrasonic emission receiver, wherein the left probe of the ultrasonic emission receiver is fixed at the inner left end of the straight measuring tube, and the right probe of the ultrasonic emission receiver is fixed at the inner right end of the straight measuring tube; an isosceles triangle-shaped thread is formed in the inner wall, between the two ends, of the straight measuring tube. The ultrasonic liquid flow measurement device is mainly used in a liquid flow defection technology.
Description
Technical field
The present invention relates to fluid flow detection technique field, more particularly, to a kind of ultrasonic liquid flow measurement apparatus.
Background technology
At present, in the ultrasonic liquid flow measurement apparatus of heating installation user port, the internal face of measurement straight tube is smooth
Face, as shown in Fig. 2 at the forward and backward two ends of measurement straight tube, respectively having the ultrasound probe of a ultrasonic transmitter-receiver,
Two ultrasonic transmitter-receivers ultrasound probe in measurement straight tube, in being axially opposite arrangement, and be separated by one section of regulation
Distance, launches simultaneously and receives the ultrasound wave Main beam of other side each other.The ultrasound wave Main beam of one probe transmitting is measured
The axial direction of straight tube reaches another one probe and receives, and it is poor, by measurement that ultrasound wave Main beam following current and adverse current propagate existence time
Time difference just can calculate the flow value of heating supply water in this measurement straight tube.The measuring ultrasonic wave flow of this shape design
The unfavorable technical problem of device is：One is due to the Main beam periphery that a ultrasound probe sends wherein, still carries a small amount of
Diverging wave, and launched forward with truncated cone shape, these diverging waves have part to be penetrated lumen wall face in shiny surface unavoidably
On, and absorbed by another ultrasound probe on opposite after reflected and diffraction, and these two-way diverging waves, it dissipates. again
The sound path of ripple is different from the sound path of Main beam, and diverging wave and Main beam have impact to the measurement of time difference, so diverging wave is just
The certainty of measurement of fluid flow can be affected.Two is due to some impurity unavoidably in heating water, of long duration can be in measurement straight tube
Upper below lumen wall deposit, it is in the tube chamber of " D " type although from " O " type tube chamber that the tube chamber in " O " type can just have been changed over by this
The amount very little being changed to " D " type tube chamber, but diverging wave passes through this echo or diffracted wave produced by impurity lodgment, with elder generation
The wave mode that front debugging sets can be variant, adds that the internal face of measurement straight tube is shiny surface, arises that measurement straight tube inwall
The difference of fineness, becomes reflection into diffuse-reflectance, and these all can affect the precision of measuring instrument.China Patent Publication No.
102116777A, in publication date on July 6th, 2011, discloses the ultrasonic of a kind of pressure conduit liquid flow velocity and fluid flow
Wave measurement method, the feature of this ultrasonic wave measuring method is to eliminate ultrasound wave using two-way simultaneous measurement method to pass in different liquids
Broadcast the error impact on certainty of measurement for the change of speed；The step of measuring method:1) measure Ti 1, the Ti2 of each sound travel simultaneously；2)
Calculate the line mean flow rate on each sound travel:3) flow velocity on each sound travel is integrated to Measure section, can obtain by surveying
The flow of amount section.It is disadvantageous in that, the ultrasonic wave measuring method of this fluid flow, one is in two ultrasound probes
Main beam periphery has substantial amounts of two-way diverging wave, and this two-way diverging wave can affect the certainty of measurement of fluid flow.Two is of long duration
Impurities in water can be deposited on the lower lumen wall face of measurement straight tube, allows the O-shaped tube chamber become the tube chamber of D type, diverging wave
Through echo or diffracted wave produced by heat absorption plate core structure chamber, adjust through echo produced by O-shaped tube chamber or diffracted wave with diverging wave
The wave mode trying to set can be variant, and the internal face along with measurement straight tube is shiny surface, arises that measurement straight tube inwall light
The difference of cleanliness, becomes reflection into diffuse-reflectance, and these all can affect the precision of measuring instrument.
Content of the invention
The purpose of the present invention is for solving the master that the smooth inner wall formula of prior art measures a ultrasound probe of straight tube
The diverging wave that acoustic beam periphery produces, this diverging wave understands some and penetrated on the lumen wall face of shiny surface, and reflected and
Absorbed by another ultrasound probe on opposite after diffraction again, and these absorbed diverging waves can affect the survey of fluid flow
Accuracy of measurement problem, and the smooth inner wall formula of prior art measure that straight tube is of long duration can be in the lower lumen wall face of measurement straight tube
Upper formation deposit, deposit allows O-shaped tube chamber become the tube chamber of D type, and diverging wave is through echo produced by heat absorption plate core structure chamber
Or diffraction waveform and initially pass through and have different wave shape between echo or diffraction waveform produced by O-shaped tube chamber, then
Internal face plus measurement straight tube is shiny surface, and impurity arises that the difference of measurement straight tube inwall fineness, and reflection is become
Diffuse-reflectance, the different wave shape that deposit occurs and diffuse-reflectance also can affect the certainty of measurement problem of fluid flow, provide one
Plant reflection and the diffraction propagation direction that can change Main beam periphery diverging wave, reduce diverging wave and absorbed by ultrasound probe, and energy
Enough stack a certain amount of deposit, diffuse-reflectance will not be produced, and then a kind of ultrasound wave of liquid flow measurement precision can be greatly improved
Liquid flow measurement device.
The present invention is to reach the concrete technical scheme that above-mentioned purpose adopted to be：
A kind of ultrasonic liquid flow measurement apparatus, including measurement straight tube, also include left ultrasonic transmitter-receiver and the right side
Ultrasonic transmitter-receiver, is provided with left hole and right hole on measurement straight tube, and the centrage of left hole, the centrage of right hole and survey
The centrage of amount straight tube is in same guided wave plane；Fix in the centrage of left hole and the infall of the centrage measuring straight tube
It is provided with left reflecting mechanism, left reflecting mechanism is fixed in measurement straight tube using supporting mechanism, and the reflecting surface of left reflecting mechanism
Vertical with guided wave plane, the centrage right-hand member of measurement straight tube and the reflecting surface angle of left reflecting mechanism are 45 degree；In right hole
The infall of the centrage of heart line and measurement straight tube is fixed with right reflecting mechanism, and right reflecting mechanism is fixed on using supporting mechanism
In measurement straight tube, and the reflecting surface of right reflecting mechanism is vertical with guided wave plane, measures the centrage left end of straight tube and right reflection
The reflecting surface angle of mechanism is 45 degree；It is provided with the left probe of left ultrasonic transmitter-receiver in left hole, be provided with the right side in right hole
The right probe of ultrasonic transmitter-receiver, the centrage of left probe is overlapped with the centrage of left hole, the centrage of right probe with right
The centrage in hole overlaps；It is provided with isosceles triangle on the inner tubal wall of measurement straight tube between left reflecting mechanism and right reflecting mechanism
Screw thread, the angle of described isosceles triangle screw thread is 30 to 90 degree, and the thread depth of described isosceles triangle screw thread is 1 to 3 milli
Rice, the flight pitch of described isosceles triangle screw thread is 0.5 to 3 millimeter.The ultrasound wave Main beam of left probe transmitting is through left anti-
Penetrate mechanism and reflex to right reflecting mechanism, then reflex to right probe from right reflecting mechanism again, right probe is received by left probe and sends out
The ultrasound wave Main beam penetrated.In the same manner, left probe is received by the ultrasound wave Main beam of right probe transmitting.And right probe receive ultrasonic
The direction that the ultrasound wave Main beam that ripple Main beam and left probe receive is propagated in current is contrary all the time, that is, there is ultrasound wave
The downstream propagation of Main beam and adverse current are propagated.But the downstream propagation of ultrasound wave Main beam and adverse current propagation existence time are poor, lead to
Cross the flow value that time of measuring difference just can calculate water in this measurement straight tube.Because ultrasonic propagation is subject to measurement straight tube inwall
Impact, the ultrasound wave Main beam after left reflecting mechanism or the reflection of right reflecting mechanism can produce in the periphery of ultrasound wave Main beam
Hair-growing powder medicine ripple, when this diverging wave reaches above the isosceles triangle screw thread on measurement straight tube inwall, isosceles triangle screw thread can change
Become the direction of propagation after the reflection of diverging wave and diffraction, after reflected and diffraction, this diverging wave will not reflex to right reflecting mechanism
Or on left reflecting mechanism, this diverging wave also would not be absorbed by the left probe on opposite or right probe it is ensured that a left side is ultrasonic
Ripple transceiver and right ultrasonic transmitter-receiver obtain more pure ultrasound wave Main beam, and then ensure that diverging wave not
The certainty of measurement of fluid flow can be affected, make the liquid flow measurement precision of this programme higher.Between isosceles triangle screw thread
Groove can stack the deposit depositing in groove, and groove dress deposit would not allow O-shaped tube chamber become the tube chamber of D type,
Echo produced by diverging wave or the waveform of diffracted wave would not be allowed to change, remain the direction of propagation of diverging wave not
Become, remain that diverging wave will not travel on right reflecting mechanism or left reflecting mechanism, allow diverging wave will not by left probe or
The right probe of person is absorbed it is ensured that diverging wave does not interfere with the certainty of measurement of fluid flow, thus greatly improving liquid flow measurement
Precision.Our measuring method is entirely to measure the flow in straight tube face with the line stream speed representation of the water on measurement straight tube axis
Come to calculate.This structure in whole flow value measurement range, the ratio of peak flow values and line flow velocity degree and minimum discharge
Value is equal with the ratio of line flow velocity degree, so that the liquid flow measurement precision of this programme is higher.Isosceles triangle screw thread
Angle be 30 degree to 90 degree, the included angle of thread of this number of degrees, more can change the direction of propagation of diverging wave, reduce diverging wave and overflow
The appearance of reflection, thus ensure liquid flow measurement precision.The thread depth of isosceles triangle screw thread is 1 to 3 millimeter, this height
The screw thread of degree can not only stack a certain amount of deposit, and more notable to the direction of propagation changing diverging wave, allows through anti-
Penetrate and will not be absorbed the measurement essence it is ensured that diverging wave does not interfere with fluid flow with the diverging wave after diffraction by ultrasound probe
Degree, thus greatly improve liquid flow measurement precision.The flight pitch of isosceles triangle screw thread is at 0.5 to 3 millimeter so that isosceles
The ultrasound wave Main beam propagated between the equal and left probe of the edge of a knife of triangle thread and right probe is vertical, thus reducing ultrasound wave master
The generation of diverging wave when acoustic beam is propagated between left probe and right probe, diverging wave is few, and interference is just few, thus ensureing on a left side
What probe and right probe received is ultrasound wave Main beam purely, and then can greatly improve liquid flow measurement precision.
Preferably, described measurement straight tube is made up of left section of pipe, stage casing pipe and right section of pipe, and the intracavity diameter of left section of pipe etc.
In the intracavity diameter of right section of pipe, the intracavity diameter of left section of pipe is 1.3 with the ratio of the intracavity diameter of stage casing pipe:1, and left section of pipe
Centrage, the centrage of stage casing pipe and right section of pipe centrage on same straight line；Described isosceles triangle screw thread is located at
On the whole inner tubal wall of stage casing pipe.There is necking down, that is, left section of pipe is the same with the intracavity diameter of right section of pipe big, stage casing is managed in measurement straight tube
Intracavity diameter less than the intracavity diameter of left section of pipe, and the ratio of the intracavity diameter of the intracavity diameter of left section of pipe and stage casing pipe
For 1.3:1, for example, the intracavity diameter of left section of pipe is 22.1 millimeters, and the intracavity diameter of stage casing pipe is 17 millimeters, the inner chamber of right section of pipe
A diameter of 22.1 millimeters.This structure design primarily to allowing the flow velocity of water to accelerate, the Peak Flow Rate of water and the minimum stream of water
The ratio of speed can reach 100：1.After the flow velocity of water accelerates, when the downstream propagation times of ultrasound wave Main beam and adverse current can be made to propagate
Between time difference become big, so that the range ability of this programme device becomes big.Time difference change increases greatly this programme device
Measurement range, allow this programme device can measure the flow value of the less water of water velocity.
Preferably, the total length of described measurement straight tube is 160 to 180 millimeters, the length of described stage casing pipe is 50 to 80
Millimeter；It is provided with left tilted surface in the junction of left section of pipe and stage casing pipe, be provided with right tilted surface in the junction of right section of pipe and stage casing pipe, left
The reflecting surface edge lowermost end of reflecting mechanism and the horizontal range of stage casing pipe high order end are 0.5 to 1 millimeter, right reflecting mechanism anti-
The horizontal range penetrating face edge lowermost end with stage casing pipe low order end is 0.5 to 1 millimeter.This structure allows ultrasound wave Main beam to propagate
Best results, and ultrasound wave Main beam produce diverging wave minimum it is easy to be controlled to diverging wave it is ensured that receiving pure
Ultrasound wave Main beam, thus ensure this programme liquid flow measurement precision higher.In addition, this structure is easily fabricated, cost
Cheap.This measurement of length straight tube, be easy to ultrasound wave Main beam propagates collection it is also possible to effectively reduce diverging wave quantity
Produce it is ensured that diverging wave does not interfere with the certainty of measurement of fluid flow, thus greatly improving liquid flow measurement precision.
Preferably, described left reflecting mechanism and described right reflecting mechanism are formed by same cylinder cutting, and institute
The angle stating the facet of cylinder with the axial line of described cylinder is 45 degree of angles, thus respectively obtaining reflecting surface is the ellipse of ellipse
Circular left reflector plate and oval right reflector plate, and the length of the major semiaxis of oval left reflector plate and oval right reflector plate half
Axle all in described guided wave plane, the reflection of the reflecting surface center of described oval left reflector plate and described oval right reflector plate
Face center is all on the centrage of described measurement straight tube.This structure ensures through oval left reflector plate and oval right reflection
Current around piece are symmetrical, symmetrical current ensure oval left reflector plate and oval right reflector plate it
Between ultrasound wave Main beam will not deviate when relaying, can be completely secured the ultrasound wave Main beam sending from left probe and from
The ultrasound wave Main beam that right probe sends is propagated in same guided wave plane, and the path propagated is identical, so, two
The difference in the propagation time of ultrasound wave Main beam that individual rightabout is propagated could more reflect the flow velocity size of water outlet, and then makes
The liquid flow measurement precision of this programme device is higher.
Preferably, described left hole and right hole are each provided at measuring the positive upper end of straight tube；Described supporting mechanism includes two pieces points
Not L-shaped support, wherein one end of a support are vertically fixed on the left end of positive lower end in measurement straight tube, other end level
It is fixed on the lower surface center of oval left reflector plate；One end of another support is vertically fixed on positive lower end in measurement straight tube
Right-hand member, the other end is horizontally fixed on the lower surface center of oval right reflector plate.This structure allows support one end and current
Direction is parallel, allows support one end vertical with water (flow) direction away from oval left reflector plate and oval right reflector plate, such energy
Enough fully ensure that current around oval left reflector plate and oval right reflector plate symmetrical be higher, higher right
Claim the ultrasound wave Main beam that the current of distribution more ensure between oval left reflector plate and oval right reflector plate when relaying
Will not deviate, the ultrasound wave Main beam that from left probe send and the ultrasound wave Main beam that from right probe send can be completely secured
Propagate in same guided wave plane, and the path propagated is identical, so, the ultrasound wave master that two rightabouts are propagated
The difference in the propagation time of acoustic beam could more reflect the flow velocity size of water outlet, and then makes the liquid flow measurement of this programme device
Precision is higher.
Preferably, described left hole and right hole are each provided at measuring the positive upper end of straight tube；Supporting mechanism includes two root posts, its
In one end of a root post be vertically fixed on the lower surface center of oval left reflector plate, the other end is fixed in measurement straight tube
On the left tilted surface of positive lower end；One end of another root post is vertically fixed on the lower surface center of oval right reflector plate, another
End is fixed on the right tilted surface of positive lower end in measurement straight tube.So can fully ensure that through oval left reflector plate and ellipse
Current about right reflector plate are symmetrical to be higher, the ultrasound wave Main beam that from left probe send can be completely secured and from the right side
The ultrasound wave Main beam that sends of popping one's head in is propagated in same guided wave plane, also largely ensure oval left reflector plate with
Ultrasound wave Main beam between oval right reflector plate will not occur when relaying to deviate left and right skew, can guarantee that and send out from left probe
The ultrasound wave Main beam that goes out and propagating in same guided wave plane from the ultrasound wave Main beam that right probe sends, and propagate
Path is identical, and so, the difference in the propagation time of ultrasound wave Main beam of two rightabout propagation could more reflect
The flow velocity size of water, so make this programme device liquid flow measurement precision higher.
Preferably, the thread-groove bottom in isosceles triangle screw thread is provided with rectangular deposition undercut.Depositing undercut is
Rectangle, is not only convenient for stacking more deposits, moreover it is possible to extend the use of this device while ensureing to improve this device precision
In the life-span, reduce input cost.
The present invention can reach following effect：
1st, the present invention passes through to arrange isosceles triangle screw thread on test inside pipe wall, allows the edge of a knife outward flange of screw thread change master
The reflection of acoustic beam periphery diverging wave and diffraction propagation direction, reduce diverging wave and are absorbed by ultrasound probe, and allow between screw thread
Groove stacks a certain amount of deposit, and deposit would not produce diffuse-reflectance when being less than screw thread, and then can greatly improve fluid flow
Certainty of measurement, extends the service life of this device.
2nd, the present invention can make the downstream propagation times of ultrasound wave Main beam and the time difference in adverse current propagation time become big, thus
The range ability making the present invention becomes big.
Brief description
Fig. 1 is that the present invention adopts support to install a kind of section view demonstration knot of oval left reflector plate and oval right reflector plate
Structure schematic diagram.
Fig. 2 is that the present invention adopts column to install a kind of section view demonstration knot of oval left reflector plate and oval right reflector plate
Structure schematic diagram.
Fig. 3 is a kind of enlarged section play configuration schematic diagram of the present invention.
Fig. 4 is a kind of section view play configuration schematic diagram of prior art.
Fig. 5 is the flow correction compensating curve schematic diagram of the present invention and prior art.
In figure：Inwall 1, oval left reflector plate 2, left probe 3, ultrasound wave Main beam 4, isosceles triangle screw thread 5, measurement
Straight tube 6, right probe 7, oval right reflector plate 8, support 9, right section of pipe 10, right tilted surface 11, stage casing pipe 12, left tilted surface 13, left section
Pipe 14, the edge of a knife 15, deposit undercut 16, diverging wave 17, diffracted wave 18, echo 19, column 20.
Specific embodiment
Below by embodiment, and combine accompanying drawing, technical scheme is described in further detail.
Example 1, a kind of ultrasonic liquid flow measurement apparatus, as shown in Figure 1, Figure 3, are 180 millimeters including total length
Measurement straight tube 6, also include left ultrasonic transmitter-receiver and right ultrasonic transmitter-receiver, measurement straight tube on be provided with left hole and
Right hole, and the centrage of the centrage of left hole, the centrage of right hole and measurement straight tube is in same guided wave plane；In left hole
Centrage and the infall of centrage of measurement straight tube be fixed with left reflecting mechanism, left reflecting mechanism adopts supporting mechanism solid
It is scheduled in measurement straight tube, and the reflecting surface of left reflecting mechanism is vertical with guided wave plane, measure centrage right-hand member and a left side for straight tube
The reflecting surface angle of reflecting mechanism is 45 degree；It is fixed with the right side in the centrage of right hole and the infall of the centrage measuring straight tube
Reflecting mechanism, right reflecting mechanism is fixed in measurement straight tube using supporting mechanism, and the reflecting surface of right reflecting mechanism and guided wave
Plane is vertical, and the centrage left end of measurement straight tube and the reflecting surface angle of right reflecting mechanism are 45 degree.It is provided with left super in left hole
The left probe 3 of acoustic emission receptor, is provided with the right probe 7 of right ultrasonic transmitter-receiver, the center of left probe in right hole
Line is overlapped with the centrage of left hole, and the centrage of right probe is overlapped with the centrage of right hole.In left reflecting mechanism and right reflection machine
The inner tubal wall of the measurement straight tube between structure is provided with isosceles triangle screw thread 5, and the angle of isosceles triangle screw thread is 90 degree, isosceles
The thread depth of triangle thread is 3 millimeters, and the flight pitch of isosceles triangle screw thread is 3 millimeters.Also in isosceles triangle spiral shell
The thread-groove bottom of stricture of vagina is provided with rectangular deposition undercut 16.Deposition undercut is rectangle, is not only convenient for stacking more deposits,
Moreover it is possible to extend the service life of this device while ensureing to improve this device precision, reduce input cost.
Measurement straight tube is made up of left section of pipe 14, stage casing pipe 12 and right section of pipe 10, and wherein, the length of left section of pipe is 45 millimeters,
The length of stage casing pipe is 80 millimeters, and the length of right section of pipe is 45 millimeters.The inner chamber that the intracavity diameter of left section of pipe is equal to right section of pipe is straight
Footpath, the intracavity diameter of left section of pipe is 1.3 with the ratio of the intracavity diameter of stage casing pipe:1, and the centrage of left section of pipe, stage casing pipe
Centrage and right section of pipe centrage on same straight line；Isosceles triangle screw thread is located at the whole inner tubal wall of stage casing pipe
On.In the present embodiment, the intracavity diameter of left section of pipe is 22.1 millimeters, and the intracavity diameter of stage casing pipe is 17 millimeters, right section of pipe
Intracavity diameter is 22.1 millimeters.It is provided with left tilted surface 13 in the junction of left section of pipe and stage casing pipe, the width of left tilted surface is 5 millimeters,
It is provided with right tilted surface 11 in the junction of right section of pipe and stage casing pipe, the width of right tilted surface is 5 millimeters.There is necking down in measurement straight tube,
I.e. left section of pipe is the same with the intracavity diameter of right section of pipe big, and the intracavity diameter of stage casing pipe is less than the intracavity diameter of left section of pipe, and
The intracavity diameter of left section of pipe is 1.3 with the ratio of the intracavity diameter of stage casing pipe:1, for example, the intracavity diameter of left section of pipe is 22.1 millis
Rice, the intracavity diameter of stage casing pipe is 17 millimeters, and the intracavity diameter of right section of pipe is 22.1 millimeters.This structure design primarily to
The flow velocity of water is allowed to accelerate, the Peak Flow Rate of water can reach 100 with the ratio of the minimum flow velocity of water：1.After the flow velocity of water accelerates, meeting
The downstream propagation times of ultrasound wave Main beam 4 and the time difference in adverse current propagation time is made to become big, so that this programme device
Range ability becomes big.Time difference becomes the measurement range increasing greatly this programme device, allows this programme device can measure current
The flow value of the less water of speed.This structure makes ultrasound wave Main beam communication effect optimal, and ultrasound wave Main beam produces
Diverging wave 17 minimum it is easy to be controlled to diverging wave it is ensured that receiving pure ultrasound wave Main beam, thus ensureing this programme
Liquid flow measurement precision higher.In addition, this structure is easily fabricated, with low cost.This measurement of length straight tube, is easy to
Propagating of ultrasound wave Main beam gathers it is also possible to effectively reduce the generation of diverging wave quantity it is ensured that diverging wave does not interfere with liquid
The certainty of measurement of flow, thus greatly improve liquid flow measurement precision.
Left reflecting mechanism and right reflecting mechanism are formed by same cylinder cutting, and the facet area of cylinder is 20 millis
Rice, and the facet of cylinder is 45 degree of angles with the angle of the axial line of cylinder, thus it is oval for respectively obtaining reflecting surface
Oval left reflector plate 2 and oval right reflector plate 8, that is, the reflecting surface area of oval left reflector plate be 20 millimeters, oval
The reflecting surface area of right reflector plate is also 20 millimeters.And the major semiaxis of oval left reflector plate and the length of oval right reflector plate
All in guided wave plane, the reflecting surface center of the reflecting surface center of oval left reflector plate and oval right reflector plate all exists semiaxis
On the centrage of measurement straight tube.This structure ensures that the current around oval left reflector plate and oval right reflector plate are
Symmetrical, symmetrical current ensure the main sound of ultrasound wave between oval left reflector plate and oval right reflector plate
Bundle will not deviate when relaying, can be completely secured the ultrasound wave Main beam sending from left probe and from right probe send super
Sound wave Main beam is propagated in same guided wave plane, and the path propagated is identical, and so, two rightabouts are propagated
The difference in the propagation time of ultrasound wave Main beam could more reflect the flow velocity size of water outlet, and then make the liquid of this programme device
Body flow measurement precision is higher.Left hole and right hole are each provided at measuring the positive upper end of straight tube；It is in " L " respectively that supporting mechanism includes two
The support 9 of shape, wherein one end of a support are vertically fixed on the left end of positive lower end in measurement straight tube, and the other end is horizontally fixed on
The lower surface center of oval left reflector plate；One end of another support is vertically fixed on the right side of positive lower end in measurement straight tube
End, the other end is horizontally fixed on the lower surface center of oval right reflector plate.And the reflecting surface side of oval left reflector plate
Horizontal range along lowermost end and stage casing pipe high order end is 1 millimeter, the reflecting surface edge lowermost end of oval right reflector plate with
The horizontal range of section pipe low order end is 1 millimeter.This structure makes support one end parallel with water (flow) direction, allows support and water (flow) direction
Vertical one end, away from oval left reflector plate and oval right reflector plate, so can fully ensure that through oval left reflection
Current around piece and oval right reflector plate are symmetrical to be higher, and higher symmetrical current more ensure in ellipse
Ultrasound wave Main beam between left reflector plate and oval right reflector plate will not deviate when relaying, and can be completely secured from a left side
Pop one's head in the ultrasound wave Main beam that sends and propagating in same guided wave plane from the ultrasound wave Main beam that right probe sends, and
The path propagated is identical, and so, the difference in the propagation time of ultrasound wave Main beam of two rightabout propagation could more
Reflection water outlet flow velocity size, and then make this programme device liquid flow measurement precision higher.
The ultrasound wave Main beam of left probe transmitting reflexes to right reflector plate through left reflector plate, then again anti-from right reflector plate
It is mapped to right probe, right probe is received by the ultrasound wave Main beam of left probe transmitting.In the same manner, left probe is received by right probe
The ultrasound wave Main beam penetrated.And the ultrasound wave Main beam that right probe is received and the ultrasound wave Main beam that receives of left probe pass in current
The direction broadcast is contrary all the time, that is, there is the downstream propagation of ultrasound wave Main beam and adverse current is propagated.But ultrasound wave Main beam
Downstream propagation and adverse current propagate that existence time is poor, by the poor flow that just can calculate water in this measurement straight tube of time of measuring
Value.Because ultrasonic propagation is affected by measurement straight tube inwall 1, ultrasonic after left reflector plate or the reflection of right reflector plate
Ripple Main beam can produce diverging wave in the periphery of ultrasound wave Main beam, and this diverging wave reaches the isoceles triangle on measurement straight tube inwall
When above shape screw thread, isosceles triangle screw thread can change the direction of propagation after the reflection of diverging wave and diffraction, reflected and diffraction
Afterwards, this diverging wave will not reflex on right reflector plate or left reflector plate, this diverging wave also would not by the left probe on opposite or
The right probe of person is absorbed it is ensured that left ultrasonic transmitter-receiver and right ultrasonic transmitter-receiver obtain more purely ultrasonic
Ripple Main beam, and then ensure that diverging wave does not interfere with the certainty of measurement of fluid flow, make the liquid flow measurement essence of this programme
Du Genggao.
Groove between isosceles triangle screw thread can stack the deposit depositing in groove, and groove dress deposit is just not
O-shaped tube chamber can be allowed to become the tube chamber of D type, the waveform of echo 19 or diffracted wave 18 produced by diverging wave would not be allowed to occur
Change, remains that the direction of propagation of diverging wave is constant, remains that diverging wave will not travel to right reflector plate or left reflection
On piece, diverging wave will not be absorbed by left probe or right probe it is ensured that diverging wave does not interfere with the measurement essence of fluid flow
Degree, thus greatly improve liquid flow measurement precision.Our measuring method is the line stream with the water on measurement straight tube axis
Speed representation entirely measures the flow in straight tube face to calculate.This structure in whole flow value measurement range, maximum stream flow
Value is equal with the ratio of line flow velocity degree and minimum stream value with the ratio of line flow velocity degree, so that the fluid flow of this programme
Certainty of measurement is higher.The angle of isosceles triangle screw thread is 30 degree to 90 degree, the included angle of thread of this number of degrees, more can change and send out
The direction of propagation of scattered ripple, reduces the irreflexive appearance of diverging wave, thus ensureing liquid flow measurement precision.Isosceles triangle screw thread
Thread depth be 1 to 3 millimeter, the screw thread of this height can not only stack a certain amount of deposit, and change is dissipated
The direction of propagation of ripple is more notable, and reflected and after diffraction diverging wave will not be absorbed it is ensured that dissipating by ultrasound probe
Ripple does not interfere with the certainty of measurement of fluid flow, thus greatly improving liquid flow measurement precision.The spiral shell of isosceles triangle screw thread
Stricture of vagina spacing is at 0.5 to 3 millimeter so that propagates between the equal and left probe of the edge of a knife 15 of isosceles triangle screw thread and right probe is ultrasonic
Ripple Main beam is vertical, thus reducing the generation of diverging wave when ultrasound wave Main beam is propagated between left probe and right probe, dissipates
Ripple is few, and interference is just few, thus ensure to receive in left probe and right probe is ultrasound wave Main beam purely, and then can be big
Big raising liquid flow measurement precision.
As the metering outfit of heat metering, dispatch from the factory and need to carry out traffic alignment, to ensure in whole range of flow, metering
It is all accurate.Its calibration steps is to take conventional flow point, demarcate flow point, 13 flow points and four flows of minimum discharge point
Point to calibrate whole range of flow as calibration point.According to our test result, the flow curve of hydraulically smooth surface flows whole
In the range of amount, round-off error deviation especially big, especially minimum discharge o'clock to 1 between 3 flow points.So our reality
Which kind of revise it is ensured that under the premise of this two point things are accurate, no matter adopted fit approach, the round-off error of intermediate point is all with reality
Round-off error deviation ratio larger.And adopt the base table of screw thread, in whole range of flow, round-off error can be within 5%,
Lower-capacity point to 1 round-off error deviation between 3 flow points be 2%.So after over-fitting, the round-off error of intermediate point is agreed
Fixed meeting, in the range of 2%, meet the requirement of secondary table measuring accuracy.
During use, as shown in figure 3, having diverging wave 17, diverging wave warp around the ultrasound wave Main beam 4 that left probe 3 sends
Diffracted wave 18 and the echo 19 crossed the diffraction of the edge of a knife 15 of isosceles triangle screw thread 5 and form diverging wave after reflecting respectively, spreads out
The direction of propagation of ejected wave and echo all there occurs change, and it changes as shown in Figure 3.Make the diverging wave will not be by right spy after change
Head absorbs, thus ensure that right probe receives is ultrasound wave Main beam purely, ultrasound wave Main beam purely can carry significantly
High liquid flow measurement precision.
In section view play configuration schematic diagram shown in Fig. 4 of prior art, dissipating after smooth inner tubal wall is propagated
The diffracted wave of ripple and echo can be propagate directly to the right probe on opposite, absorbed by the right probe on opposite, diverging wave is absorbed
The certainty of measurement of fluid flow can be affected.And in the section view play configuration schematic diagram shown in Fig. 1 of the present invention, by isosceles three
Diverging wave after angular screw thread propagation, the diverging wave diffracted wave of diverging wave and reflection after the edge of a knife through isosceles triangle screw thread
Ripple there occurs the change of propagation path, and diverging wave will not be propagate directly to the right probe on opposite, and diverging wave will not be by the right side on opposite
Probe is absorbed, and therefore diverging wave does not interfere with the certainty of measurement of fluid flow, thus ensureing the certainty of measurement of fluid flow more
Height, more reliable.In the same manner, the operation principle of the ultrasound wave Main beam sending from right probe and the main sound of ultrasound wave sending from left probe
Bundle operation principle identical such that it is able to greatly improve liquid flow measurement precision.
Table 1,
Table 1 is measuring result error correction chart.
Inner tubal wall error correction curve shown in Figure 5, in identical range of flow, with isosceles triangle screw thread
Radian little (as shown in thick line in Fig. 5), and the radian of smooth inner tubal wall error correction curve big (as fine rule institute in Fig. 5
Show).Radian is big, and this line (fine rule) is exactly a relatively multistage function, comprehends more difficult, by mistake at multistage Function Fitting
Difference also can become big, and then makes liquid flow measurement precision step-down.On the contrary, radian is little, this line (thick line) be exactly one relatively
The function of low price, comprehends simple many at the Function Fitting of low order, error also can be little, and then makes liquid flow measurement precision
High.
Example 2, example 2 is exactly that the support in example 1 is replaced with column, and other structures are identical with example 1, referring to figure
Shown in 2.Supporting mechanism adopts two root posts, and one end of wherein one root post is vertically fixed on the lower surface of oval left reflector plate
Center, the other end is fixed on the left tilted surface of positive lower end in measurement straight tube；One end of another root post 20 is vertically fixed on ellipse
The lower surface center of circular right reflector plate, the other end is fixed on the right tilted surface of positive lower end in measurement straight tube.So can fill
Current about oval left reflector plate and oval right reflector plate for the code insurance card are symmetrical to be higher, can be completely secured
Propagate in same guided wave plane from the ultrasound wave Main beam that left probe sends with from the ultrasound wave Main beam that right probe sends,
Also largely ensure that the ultrasound wave Main beam between oval left reflector plate and oval right reflector plate will not when relaying
Occur to deviate left and right skew, can guarantee that the ultrasound wave Main beam sending from left probe and the ultrasound wave Main beam sending from right probe
Propagate in same guided wave plane, and the path propagated is identical, so, the ultrasound wave master that two rightabouts are propagated
The difference in the propagation time of acoustic beam could more reflect the flow velocity size of water outlet, and then makes the liquid flow measurement of this programme device
Precision is higher.
Example 3, example 3 is exactly that the isosceles triangle screw thread in example 1 is replaced using isosceles triangle ring grain, other
Structure is identical with example 1.Isosceles triangle ring grain is to need, when processing isosceles triangle ring grain, to need measurement is straight
Pipe is first divided into two halves, processes the isosceles triangle ring grain of formed objects, after processing, two halves altogether on every half inwall
Just on the inwall of measurement straight tube, it has been designed to the complete isosceles triangle ring grain of a lot of.The edge of a knife energy of isosceles triangle ring grain
Enough central axis completely with measurement straight tube, this structure is easily controllable to the direction of propagation change of diverging wave, remains
The direction of propagation of diverging wave will not travel to, on left probe or right probe, can not interfere with fluid flow by Reliable guarantee diverging wave
Certainty of measurement, thus greatly improve liquid flow measurement precision.
Present configuration is simple, by setting isosceles triangle screw thread or lumbar triangle shape ring stricture of vagina on test inside pipe wall, allows
The outward flange of the edge of a knife and the edge of a knife changes the echo of ultrasound wave Main beam periphery diverging wave and the direction of propagation of diffracted wave, reduces and sends out
Scattered ripple is absorbed by left probe or right probe, and allows the groove between screw thread stack a certain amount of deposit, and it is high that deposit is less than screw thread
Diffuse-reflectance would not be produced when spending, and then liquid flow measurement precision can be greatly improved, extend the service life of this device.
The embodiments of the present invention above in conjunction with Description of Drawings, but do not limited by above-described embodiment when realizing, this area
Those of ordinary skill can make a variety of changes within the scope of the appended claims or change.
Claims (2)
1. a kind of ultrasonic liquid flow measurement apparatus, connect it is characterised in that also including left ultrasonic emitting including measurement straight tube
Receive device and right ultrasonic transmitter-receiver, measurement straight tube is provided with left hole and right hole, and the centrage of left hole, right hole
The centrage of heart line and measurement straight tube is in same guided wave plane；Left hole centrage and measurement straight tube centrage friendship
It is fixed with left reflecting mechanism, left reflecting mechanism is fixed in measurement straight tube using supporting mechanism, and left reflecting mechanism at fork
Reflecting surface vertical with guided wave plane, the reflecting surface angle of centrage right-hand member and the left reflecting mechanism of measurement straight tube is 45 degree；?
The infall of the centrage of the centrage of right hole and measurement straight tube is fixed with right reflecting mechanism, and right reflecting mechanism adopts support machine
Structure is fixed in measurement straight tube, and the reflecting surface of right reflecting mechanism is vertical with guided wave plane, the centrage left end of measurement straight tube
Reflecting surface angle with right reflecting mechanism is 45 degree；It is provided with the left probe of left ultrasonic transmitter-receiver in left hole, in right hole
Inside it is provided with the right probe of right ultrasonic transmitter-receiver, the centrage of left probe is overlapped with the centrage of left hole, in right probe
Heart line is overlapped with the centrage of right hole；It is provided with the inner tubal wall of measurement straight tube between left reflecting mechanism and right reflecting mechanism
Lumbar triangle shape screw thread, the angle of described isosceles triangle screw thread is 30 to 90 degree, the thread depth of described isosceles triangle screw thread
For 1 to 3 millimeter, the flight pitch of described isosceles triangle screw thread is 0.5 to 3 millimeter；
Described measurement straight tube is made up of left section of pipe, stage casing pipe and right section of pipe, and the intracavity diameter of left section of pipe is equal to the interior of right section of pipe
Chamber diameter, the intracavity diameter of left section of pipe is 1.3 with the ratio of the intracavity diameter of stage casing pipe:1, and the centrage of left section of pipe, in
The centrage of the centrage of section pipe and right section of pipe is on same straight line；Described isosceles triangle screw thread is located at the whole of stage casing pipe
On inner tubal wall；
The total length of described measurement straight tube is 160 to 180 millimeters, and the length of described stage casing pipe is 50 to 80 millimeters；Manage at left section
Be provided with left tilted surface with the junction of stage casing pipe, be provided with right tilted surface in the junction of right section of pipe and stage casing pipe, left reflecting mechanism anti-
The horizontal range penetrating face edge lowermost end with stage casing pipe high order end is 0.5 to 1 millimeter, the reflecting surface edge bottom of right reflecting mechanism
End is 0.5 to 1 millimeter with the horizontal range of stage casing pipe low order end；
Described left reflecting mechanism and described right reflecting mechanism are formed by same cylinder cutting, and the facet of described cylinder
Angle with the axial line of described cylinder is 45 degree of angles, thus respectively obtain reflecting surface be the oval left reflector plate of ellipse and
Oval right reflector plate, and the major semiaxis of the major semiaxis of oval left reflector plate and oval right reflector plate is all in described guided wave
In plane, the reflecting surface center of the reflecting surface center of described oval left reflector plate and described oval right reflector plate is all described
On the centrage of measurement straight tube；
Described left hole and right hole are each provided at measuring the positive upper end of straight tube；Described supporting mechanism includes two L-shaped propping up of difference
Frame, wherein one end of a support are vertically fixed on the left end of positive lower end in measurement straight tube, and the other end is horizontally fixed on ellipse
The lower surface center of left reflector plate；One end of another support is vertically fixed on the right-hand member of positive lower end in measurement straight tube, another
End is horizontally fixed on the lower surface center of oval right reflector plate；
It is provided with rectangular deposition undercut in the thread-groove bottom of isosceles triangle screw thread；
Isosceles triangle screw thread to be replaced using isosceles triangle ring grain；
The edge of a knife of isosceles triangle ring grain can completely with measurement straight tube central axis；
The intracavity diameter of left section of pipe is 22.1 millimeters, and the intracavity diameter of stage casing pipe is 17 millimeters, and the intracavity diameter of right section of pipe is
22.1 millimeters.
2. a kind of ultrasonic liquid flow measurement apparatus according to claim 1 are it is characterised in that described left hole and right hole
It is each provided at measuring the positive upper end of straight tube；Supporting mechanism includes two root posts, and one end of wherein one root post is vertically fixed on ellipse
The lower surface center of the left reflector plate of shape, the other end is fixed on the left tilted surface of positive lower end in measurement straight tube；Another root post
One end is vertically fixed on the lower surface center of oval right reflector plate, and the other end is fixed on the right side of positive lower end in measurement straight tube tiltedly
On face.
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| DE102016008302A1 (en) * | 2016-07-06 | 2018-01-11 | Diehl Metering Gmbh | Ultrasonic counter for detecting a flow rate of a fluid |
| CN107576360A (en) * | 2017-08-18 | 2018-01-12 | 浙江天信仪表科技有限公司 | Small-bore ultrasonic water meter |
| FR3080683B1 (en) * | 2018-04-30 | 2023-03-17 | Buerkert Werke Gmbh & Co Kg | FLUID MEASURING MEANS |
| CN108871475A (en) * | 2018-05-04 | 2018-11-23 | 金卡智能集团股份有限公司 | Supersonic wave metering device |
| CN109855693A (en) * | 2019-03-26 | 2019-06-07 | 杨启敖 | Ultrasonic water meter apparatus with leak protection and prefilter |
| CN111896062B (en) * | 2020-07-24 | 2022-09-20 | 北京瑞德联数据科技有限公司 | Ultrasonic flow measurement device, ultrasonic flow measurement equipment and storage medium |
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