CN208156031U - A kind of measurement device suitable for liquid surface flow velocity - Google Patents
A kind of measurement device suitable for liquid surface flow velocity Download PDFInfo
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- CN208156031U CN208156031U CN201820671464.9U CN201820671464U CN208156031U CN 208156031 U CN208156031 U CN 208156031U CN 201820671464 U CN201820671464 U CN 201820671464U CN 208156031 U CN208156031 U CN 208156031U
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Abstract
The utility model discloses a kind of measurement devices suitable for liquid surface flow velocity, including motion profile limiting mechanism, angular displacement detecting device（2）, always float on liquid surface and can with liquid flow and the bouyant wheel of rotation（1）, clump weight（5）, angular displacement detecting device（2）On the motion profile limiting mechanism, bouyant wheel（1）It is axially parallel to liquid level during rotation and perpendicular to liquid flow direction, bouyant wheel（1）Immersion depth be X, and 0.02R<X<0.4R, wherein bouyant wheel（1）Radius be R, one end of motion profile limiting mechanism and bouyant wheel（1）Shaft be connected, the fixture above the other end and liquid surface（4）It is connected, clump weight（5）It is connected as one with motion profile limiting mechanism.The bouyant wheel of rotation is axially parallel to liquid level to the utility model during rotation and perpendicular to liquid flow direction and floating on liquid surface always and can flow with liquid, is not easy to wind the sundries such as water plant, realizes automatic monitor for continuously.
Description
Technical field
The utility model relates to a kind of flow velocity fields of measurement, more particularly to a kind of measurement suitable for liquid surface flow velocity
Device.
Background technique
Current meter is also known as " current meter ", is a kind of instrument to measure fluid velocity in pipeline or channel.Measure flow velocity
Afterwards, it is converted into flow multiplied by fluid cross-section, thus is also used for indirect measuring flow.Have that pitot tube, orifice meter, test the speed nozzle
With current meter etc. in literary minister.
Currently, the method for measuring flow rate of liquid in non-full pipeline and open channel is rotary propeller type current meter, propeller type current meter master
It to be made of rotation paddle, stature and empennage three parts, rotation paddle is provided with signal contact and bearing shaft etc., can utilize flow dynamic
Drive rotor rotation inquires into flow velocity according to velocity of rotation, and application method is that current meter is passed through hand-held measuring staff or hydrometric cableway
It suspends the devices such as fish lead in midair to immerse in liquid, by measuring the revolving speed of rotating plasma, liquid is calculated in conjunction with waterpower screw pitch, instrumental constant
Flow velocity.When there are be easy to causeing the winding of rotating plasma to block when weeds, mud, therefore being generally not suitable for continuous automatic prison in liquid
It surveys.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of survey suitable for liquid surface flow velocity
Determine device.
The purpose of this utility model is achieved through the following technical solutions：A kind of survey suitable for liquid surface flow velocity
Determine device to include motion profile limiting mechanism, angular displacement detecting device, float on liquid surface always and can flow and oneself with liquid
Bouyant wheel, the clump weight turned, the angular displacement detecting device are set on the motion profile limiting mechanism, and bouyant wheel is during rotation
It is axially parallel to liquid level and perpendicular to liquid flow direction, the immersion depth of bouyant wheel is X, and 0.02R<X<0.4R, wherein bouyant wheel
Radius be R, motion profile limiting mechanism limitation bouyant wheel gone up and down, motion profile along a fixed track with the change of liquid level
One end of limiting mechanism is connected with the shaft of bouyant wheel, and the other end is connected with the fixture above liquid surface, the clump weight with
The motion profile limiting mechanism is connected as one.
The motion profile of the bouyant wheel is straight line or camber line.
The motion profile limiting mechanism includes connecting rod, and the connecting rod is movably connected with the fixture, the clump weight
It is connected as one with the fixture, connecting rod.
The motion profile limiting mechanism further includes connecting rod stabilising arrangement, and the connecting rod stabilising arrangement is set to liquid surface
On the fixture of top.
The connecting rod stabilising arrangement is made of multiple fixed pulley groups, and connecting rod is inserted through the gap between fixed pulley in groups.
The motion profile limiting mechanism includes sliding rail and connecting rod, and one end of connecting rod is equipped with more linear bearings, institute
It states linear bearing to be connected with sliding rail sliding, the connecting rod is connected by counterweight bracing wire with the clump weight, and the sliding rail is fixed on
Ullage.
A kind of measurement device suitable for liquid surface flow velocity further includes liquid level detection device, the level sensing
Device is set on the motion profile limiting mechanism.
The bouyant wheel is body of revolution.
The fixture is universal joint.
The utility model has the beneficial effects that：
1）Existing rotary propeller type current meter measures flow velocity by revolving the rotation of paddle, revolves paddle rotary shaft and liquid during rotation
Body contact causes rotation paddle to be easier to the sundries such as winding water plant, and bouyant wheel floats on liquid surface and the rotation with liquid flowing always, floats
Shaft not contact liq is taken turns, and bouyant wheel is axially parallel to liquid level and perpendicular to liquid flow direction during rotation, using floating
Wheel 1 reduces the obstruction to liquid stream with the rolling of liquid stream, reduces wave making, and roll the twister crossed in liquid, is not easy to wind
The sundries such as water plant.
2）Connecting rod stabilising arrangement avoids connecting rod from being influenced by the movement of bouyant wheel, makes whole device more to stablize connecting rod
It is firm, improve the reliability of device movement, it is preferred that the connecting rod stabilising arrangement is made of multiple fixed pulley groups, and multiple groups are fixed
Pulley is used cooperatively, and can further consolidate connecting rod, and connecting rod is inserted through the gap between fixed pulley in groups, and fixed pulley is fixed in
On canal wall, when bouyant wheel is flowed with liquid and moved up and down, connecting rod is forced with bouyant wheel motion state having the same, by determining cunning
The sliding of wheel acts on, so that connecting rod moves up and down in the gap of fixed pulley in groups, reaching can make connecting rod move up and down and fix
The effect of connecting rod.
3）Linear bearing is a kind of linear motion system, is used cooperatively for rectilinear path and cylindrical shaft, due to bearing ball
With bearing outside point contact, steel ball is rolled with the smallest frictional resistance, therefore linear bearing has friction small and more stable,
Do not change with bearing speed, high sensitivity, steady linear motion with high accuracy can be obtained, linear bearing slides phase with sliding rail
Even, structure is simple, is easily installed.
4）One end of motion profile limiting mechanism is mounted on the fixture above liquid surface, is turned by measurement universal joint
The angle crossed measures the height of liquid level, and measurement method is simple and reliable.
5）The bouyant wheel 1 is body of revolution, and the shape for enabling to bouyant wheel 1 to immerse in liquid is kept not during rotation
Become.
Detailed description of the invention
FIG. 1 is a schematic structural view of the utility model；
Structural schematic diagram when Fig. 2 is using connecting rod；
Structural schematic diagram when Fig. 3 is using linear bearing；
Fig. 4 is the schematic cross-section of bouyant wheel；
Fig. 5 is the schematic cross-section of propeller type current meter；
In figure, 1- bouyant wheel, 2- angular displacement detecting device, 3- connecting rod, 4- fixture, 5- clump weight, 6- sliding rail, 7- linear axis
It holds, 8- counterweight bracing wire, 9- fixed pulley group.
Specific embodiment
Below in conjunction with embodiment, the technical solution of the utility model is clearly and completely described, it is clear that retouched
The embodiment stated is only the utility model a part of the embodiment, instead of all the embodiments.Based in the utility model
Embodiment, those skilled in the art's every other embodiment obtained under the premise of not making the creative labor, all belongs to
In the range of the utility model protection.
Refering to fig. 1-5, the utility model provides a kind of technical solution：As shown in Figure 1, a kind of be suitable for liquid surface flow velocity
Measurement device, including motion profile limiting mechanism, angular displacement detecting device 2, float on liquid surface always and can be with liquid flow
It moves and the bouyant wheel 1 of rotation, clump weight 5.
The angular displacement detecting device 2 for flow velocity measurement is mounted on motion profile limiting mechanism, specifically, angle position
Moving detection device 2 includes sensing element and trigger source, and wherein photoelectricity, magnetoelectricity sensing element are mounted on motion profile limiting mechanism
On, as being mounted in other positions of the bouyant wheel 1 except bouyant wheel center every mating plate, magnet for trigger source, the sensing element passes through
Water-proofing treatment in order to avoid bouyant wheel 1 rotates the liquid that splashes and influences normal use, angular displacement detecting device 2 can for angular displacement sensor or
Counter.
When the angular displacement detecting device 2 is angular displacement sensor, in the occasion of more demanding resolution ratio, rotation can be used
Turn encoder（Photo-electric or magnetic-type）To realize the measurement to angle displacement.
Rotary encoder includes photoelectric coding, magnetic coding and several forms of mechanical coding, is used for object rotational angle
Or angular speed switchs to electric signal；Photoelectric rotary coder, can be by machines such as the angular displacement of output shaft, angular speed by photoelectric conversion
Tool amount is converted into corresponding electric pulse with digital output.
Magnetic encoder has excellent shock resistance and vibration characteristic in the way of magnetic detection using hall principle, and
It is designed using magneto-electric, generates by magnetic induction device, using the variation in magnetic field and the absolute position of rotor is provided, utilize magnetic
Device is instead of traditional code-disc, and more antidetonation, corrosion-resistant, anti-pollution, reliable performance are high, structure is simpler.
Low-cost occasion is being required, magnet/tongue tube, photoelectrical coupler can be used（Groove profile, reflection-type）Come
Reach measurement purpose.
It is that the tongue tube is usually made into there are two soft magnetic material, without magnetic when the metal spring leaf contact that disconnects, some is also
There is reed of the third as normally-closed contact.These reed contacts are encapsulated in filled with inert gas (such as nitrogen, helium) or vacuum
Glass tube in, the leaf end that is encapsulated in parallel in glass tube overlapping, and there are certain interval or contacting with each other to constitute switch
Normally opened or normally-closed contact.Tongue tube is simpler than common mechanical construction of switch, small in size, speed is high, long working life；And with electricity
Sub switch is compared, it has the features such as anti-loading impact capacity is strong again, and functional reliability is very high.
The photoelectrical coupler is a kind of electric one power conversion device of a light using light as media transmission electric signal, in photoelectricity coupling
Clutch input terminal power up signal makes light emitting source shine, and the intensity of light depends on the size of exciting current, this illumination, which is mapped to, to be encapsulated in
After on light-receiving device together, photoelectric current is produced because of photoelectric effect, is drawn by light-receiving device output end, realizes electric one electricity of a light
Conversion, plays the role of input, output, isolation.Due to being mutually isolated between photo-coupler input and output, electric signal transmission has single
The features such as tropism, thus there is good electrical isolation capabilities and anti-interference ability.
When the angular displacement detecting device 2 is counter, counter is set on bouyant wheel 1, by calculating bouyant wheel 1 in list
Position the time in rotate number come achieve the purpose that calculate angular displacement.
The fixture 4 is universal joint, is the parts for realizing the transmitting of varied angle power, for needing to change transmission axis side
To position, the axial direction of bouyant wheel 1 can be guaranteed always perpendicular to liquid flow direction.
As shown in Figure 4 and Figure 5, existing rotary propeller type current meter measures flow velocity by revolving the rotation of paddle, and rotation paddle, slurry axis are turning
It is contacted during dynamic with liquid, rotation paddle is caused to be easier to the sundries such as winding water plant, and bouyant wheel 1 floats on liquid surface and always with liquid
Flowing and rotation, the immersion depth of the bouyant wheel 1 are X, and 0.02R<X<0.4R, wherein the radius of bouyant wheel 1 is R, and liquid cannot
Wheel shaft is flooded, in order to avoid pour into liquid in bearing, then 1 shaft of bouyant wheel not contact liq, and bouyant wheel 1 is axial parallel during rotation
In liquid level and perpendicular to liquid flow direction, reduces the obstruction to liquid stream with the rolling of liquid stream using bouyant wheel 1, reduces wave making,
And the twister crossed in liquid is rolled, it is not easy to wind the sundries such as water plant.
Further, the bouyant wheel 1 is cylindrical bouyant wheel, and the bouyant wheel 1 is the bouyant wheel similar to cartwheel pattern, on the one hand
The part for enabling to bouyant wheel 1 to be immersed under liquid be approximately it is streamlined, convenient for reducing resistance suffered in 1 motion process of bouyant wheel
Power, on the other hand, the bouyant wheel 1 are body of revolution, further, body of revolution made of the wheel structure be made of tire and wheel hub
Structure, the shape for enabling to bouyant wheel 1 to immerse in liquid remain unchanged during rotation.
The clump weight 5 is connected as one with the motion profile limiting mechanism, and the effect of the clump weight 5 is to balance
The weight of bouyant wheel 1 and motion profile limiting mechanism makes bouyant wheel 1 obtain immersion depth appropriate in a liquid.
The motion profile limiting mechanism limitation bouyant wheel 1 is gone up and down along a fixed track with the change of liquid level, specifically
, the motion profile of the bouyant wheel 1 is straight line or camber line, then bouyant wheel 1 can move up and down or curvilinear motion along liquid motion, institute
The one end for stating motion profile limiting mechanism is connected with the shaft of bouyant wheel 1, then bouyant wheel ontology is installed in shaft, the other end and liquid
The fixture 4 of surface is connected, to stablize whole device.
The motion profile limiting mechanism includes connecting rod 3, and the connecting rod 3 is movably connected with the fixture 4, so that connecting rod
3 can be fulcrum rotation with fixture 4, and the clump weight 5 is connected as one with the fixture 4, connecting rod 3, passes through clump weight 5
Counterweight effect to balance bouyant wheel 1 indirectly, guarantees the stable motion of bouyant wheel 1.
Preferably, the connecting rod 3 is hard connecting rod, specifically, the connecting rod 3 is rigid link, to guarantee that bouyant wheel 1 exists
It is unlikely because the flowing of liquid moves left and right bouyant wheel 1 when Liquid, it is further ensured that the stable motion of bouyant wheel 1.
As shown in Fig. 2, the motion profile limiting mechanism further includes connecting rod stabilising arrangement, the connecting rod stabilising arrangement is set
On fixture 4 above liquid surface, to stablize connecting rod 3, avoids connecting rod 3 from being influenced by the movement of bouyant wheel 1, make entirely to fill
Set more firm, the reliability of raising device movement, it is preferred that the connecting rod stabilising arrangement is made of multiple fixed pulley groups 9,
Connecting rod 3 is inserted through the gap between fixed pulley in groups, and multiple groups fixed pulley is used cooperatively, and can further consolidate connecting rod 3, connecting rod 3
It is inserted through the gap between fixed pulley in groups, fixed pulley is fixed in Qu Bishang, moves up and down when bouyant wheel 1 is gone up and down with liquid level
When, it drives connecting rod 3 with the motion state having the same of bouyant wheel 1, is acted on by the sliding of fixed pulley, so that connecting rod 3 is fixed in groups
It moves up and down in the gap of pulley, has the function that connecting rod 3 can be made to move up and down and fix connecting rod 3.
Preferably, hollow structure can be used in the connecting rod 3, and the signal wire of angular displacement detecting device 2 can be from the inside of connecting rod 3
It passes through, and is drawn from 3 top of connecting rod, so that signal wire is also able to maintain in liquid flowing or the biggish occasion of liquid level variation range
It is dry, and then guarantee the normal transmission of signal.
As shown in figure 3, another implementation of the motion profile limiting mechanism is：The motion profile limitation
Mechanism includes sliding rail 6 and connecting rod 3, and one end of connecting rod 3 is equipped with more linear bearings 7, and the linear bearing 7 is slided with sliding rail 6
It is connected, the connecting rod 3 is connected by counterweight bracing wire 8 with the clump weight 5, and the sliding rail 6 is fixed on ullage.
The linear bearing 7 is a kind of linear motion system, is used cooperatively for rectilinear path and cylindrical shaft, due to carrying
Ball and bearing outside point contact, steel ball are rolled with the smallest frictional resistance, therefore linear bearing 7 has friction small, and relatively more steady
It is fixed, do not change with bearing speed, high sensitivity, steady linear motion with high accuracy can be obtained.
Linear bearing 7 is mounted on connecting rod 3, can guarantee that the held stationary straight line under liquid mobilization of bouyant wheel 1 is transported
It is dynamic, the precision of whole device is improved, linear bearing 7 is slided up and down in sliding rail 6, provides necessity for the normal work of whole device
Basis, structure is simple, is easily installed.
A kind of measurement device suitable for liquid surface flow velocity further includes liquid level detection device, to measure liquid
Position, the liquid level detection device is set on the motion profile limiting mechanism, for the structure in Fig. 1, the liquid level displacement
Detection device obtains liquid level by detecting the pitch angle of connecting rod 3, it is preferred that in the structure of fig. 1, can also be on connecting rod 3
The pitch angle of mounted angle sensor measurement connecting rod 3, structure is simpler, and obliquity sensor can use strain gauge transducer, 3 axis
Acceleration combines 3 axis gyroscopes and Kalman filtering sensor, and the structure for Fig. 2, Fig. 3 is then to belong to fixture by measurement
The angular displacement of 4 counterweight bracing wire fixed pulley obtains liquid level.
Further, the liquid level displacement detector is rotary encoder, specifically, the liquid level displacement detector
Absolute optical encoder or magnetic coder can be selected.
When rotary encoder is absolute optical encoder, each position of absolute optical encoder is absolutely only
One, anti-interference, be not necessarily to power-failure memory so that measurement process is more convenient, measurement data is more accurate, when rotary encoder be magnetic
When encoder, effect is as previously described.
Using the measurement method of the measurement device, the calculation formula of liquid surface actual flow velocity V is：V = Y-
YX0/Z + aY3X0/Z - bY3X0/Z2 + c....... is 1., wherein V is to be flowed by the surface that the measurement device measures
Speed, c are meter parameter, and Z indicates liquid depth（Liquid level）, X0For the immersion depth of bouyant wheel 1, Y indicates that 1 lower edge flow velocity of bouyant wheel, a are
Upper lift effect correction factor, b are shallow water effect correction factor；
By the revolving speed of measurement bouyant wheel 1, liquid surface flow velocity is calculated in conjunction with bouyant wheel radius, instrumental constant, theoretically,
Bouyant wheel operating is synchronous with liquid stream and after stablizing, and bouyant wheel lower edge flow rate of liquid is：
Y=ω * R ... 5.,
Formula 5. in, R is the radius of bouyant wheel 1, and ω is the magnitude of angular velocity that measures of angular displacement detecting device 2, and Y indicates bouyant wheel 1
Lower edge flow velocity；
When bouyant wheel 1 has certain immersion depth and flow rate of liquid is not 0, bouyant wheel lower edge flow velocity is not fully equal to liquid level
Flow velocity, introducing instrument coefficient c indicates the influence of bouyant wheel rotating mechanism, and considers to cause overcurrent under bouyant wheel due to bouyant wheel immersion depth
The effect that section reduces, is modified to obtain to surface velocity：
V=Y* (Z-X)/Z+c ... 6.,
Wherein, V is the surface velocity measured by test device, and c is meter parameter, and Z indicates liquid depth（Liquid level）, X
For the immersion depth of bouyant wheel 1, Y indicates the lower edge flow velocity of bouyant wheel 1.
1 dynamic immersion depth X of bouyant wheel is not a fixed value, but variable related with flow velocity, liquid level, works as flow rate of liquid
When being zero, the static immersion depth of bouyant wheel 1 depends on the balance of buoyancy and gravity, according to buoyancy at this time and gravity it is equal with
And the variation of liquid level is equal to and arranges the volume of liquid and the quotient of the floor space of fluid passage obtains the height of fluid change；When
When flow rate of liquid is not zero, situation becomes more complicated, at this moment will appear both sides effect：
1）When immersion depth non-zero, the liquid of flowing has a upper lifting force to bouyant wheel, reduces immersion depth；Work as bouyant wheel
When the ratio of immersion depth and bouyant wheel radius is smaller, upper lifting force is approximate with immersion depth directly proportional, square directly proportional to flow velocity；
Because the liquid of flowing is pushed in 1 leading edge of bouyant wheel by entire bouyant wheel 1, it is equivalent to linear motion and is changed to circular motion, the center of circle is located at
Before bouyant wheel 1 under liquid, the centripetal force and linear velocity square direct ratio that it is subject to, the active force that bouyant wheel 1 is subject to are equal to this centripetal force,
Therefore the upper lifting force and flow velocity is square directly proportional.
2）According to continuity theorem, the liquid velocity ratio liquid level flow velocity below bouyant wheel is bigger；Further according to Bernoulli's theorem, stream
Speed, which increases, causes static pressure to reduce, and will lead to bouyant wheel sinking, and immersion depth increases；Deflection is directly proportional to square of flow velocity, with leaching
Enter the ratio of depth Yu liquid depth（X/Z）It is directly proportional, i.e., so-called shallow water effect.
To reduce error, static immersion depth on the one hand should be minimized under the premise of guaranteeing that mechanical movement is reliable and is floated
The ratio of radius is taken turns, on the other hand, respectively indicates the influence of above two effect by introducing 2 correction factors a, b, a can
Referred to as upper to lift effect correction factor, b can be described as shallow water effect correction factor；And bouyant wheel static state immersion depth X is used in correction term0
Instead of bouyant wheel dynamic immersion depth, actual flow velocity is replaced with bouyant wheel lower edge flow rate of liquid approximation；The dynamic for obtaining bouyant wheel 1 immerses deeply
Spend X and static immersion depth X0There are following relationships：
X = X0 - aY2X0 + bY2X0/Z ....... ⑦
Wherein a is upper lift effect correction factor（Unit m^2/s^2）, b is shallow water effect correction factor（Unit m^3/s^
2）；
According to the calculation formula that surface velocity 5., 6., 7. can be obtained：
V = Y- YX0/Z + aY3X0/Z - bY3X0/Z2 + c ....... ①
The surface velocity measurement device needs to carry out before use calibration, and the method for calibration includes the following steps：
1）Reference current metre and the present apparatus are placed in simultaneously in the liquid in same channel, and keep liquid static, adjusting is matched
Pouring weight 5 makes the immersion depth of bouyant wheel 1 be equal to specified static immersion depth X0Value；
The static immersion depth X of the bouyant wheel 10It is reasonable for the nominal operation index determined when an exfactory inspection
Value range is the 2% ~ 40% of bouyant wheel radius；Lesser X0Be conducive to reduce blocking and interference of the bouyant wheel 1 to liquid stream, improve measurement
Precision, but be unfavorable for overcoming the resistance of elevating movement mechanism when bouyant wheel 1 is gone up and down with liquid level；Ensuring 1 elevating movement of bouyant wheel
Under the premise of mechanism action is reliable, bouyant wheel static state immersion depth X should be minimized0。
2）Change 5% ~ 10% that actual surface flow velocity V is nominal sheet flow velocity, to ignore shallow water effect, guarantees 10 times or more
Liquid depth Z and bouyant wheel 1 immersion depth X ratio, and record this measurement bouyant wheel lower edge flow velocity Y1Value, actual flow velocity
V1Value, liquid depth Z1Value, wherein nominal flow rate is the maximum value that is capable of measuring in the case where guaranteeing precision conditions of reference current metre；
3）Keep liquid depth Z1It is constant, change 80% ~ 95% that actual surface flow velocity is nominal flow rate, and record this survey
Measure bouyant wheel lower edge flow velocity Y2Value, actual surface flow velocity V2Value；
4）Keep actual surface flow velocity V2Constant, to simulate shallow water effect, adjusting liquid depth makes liquid depth Z and immerses
The ratio of depth X is 2 ~ 4 times, and records this measurement bouyant wheel lower edge flow velocity Y3, actual surface flow velocity V3Value, liquid depth Z2
Value；
5）Pass through relational expression V=Y- YX0/Z + aY3X0/Z - bY3X0/Z2 + c obtains following three equation
Formula, and determine by the equation group value of a, b, c；
V1 = Y1 - Y1X0/Z1 + aY1 3X0/Z1 - bY1 3X0/Z1 2 + c； ②
V2 = Y2 - Y2X0/Z1 + aY2 3X0/Z1 - bY2 3X0/Z1 2 + c； ③
V3= Y3 - Y3X0/Z2 + aY3 3X0/Z2 - bY3 3X0/Z2 2 + c； ④
6）During actual measurement, liquid table is calculated by relational expression obtained in the value substitution 1. by a, b, c
The actual surface flow velocity V in face.
Above-mentioned measurement process at least measures 3 values to determine a, b, c, can also take multiple measurements, further decrease mistake
Difference, further, above-mentioned measurement process can pass through standard water tank experimental provision（The circulating water chennel of changeable flow velocity, flow）Or benefit
It is carried out with the channel for having gate, principle is all to change flow velocity and then reach calibration purpose.
In Fig. 1, in 4 position of fixture installation level gauging angular displacement sensor measure the angle of connecting rod 3 and vertical line into
And liquid level is obtained, relationship is：
Z = H - L*cos(φ) - R + X -----------------------⑧
In formula：Z:Liquid level, H:The elevation of fixture 4, L:The length of connecting rod 3, R:The radius X of bouyant wheel 1:Dynamic immerses deep
Degree, φ:The angle of connecting rod 3 and vertical line.
If installing level gauging angular displacement sensor using the structure of Fig. 2, Fig. 3 on fixture 4 and measuring fixture 4
Angular displacement, available liquid level：
Z = RIt is fixed*φ + X ---------------------------⑨
R in formulaIt is fixed:Fixed pulley radius, φ:Fixed pulley angular displacement（Unit is radian）, X:Dynamic immersion depth.
As described above, dynamic immersion depth when liquid flows is related to flow velocity, liquid level, can when carrying out data processing
First with static immersion depth X0Instead of dynamic immersion depth X according to 8. or 9. formula primary Calculation goes out liquid level Z provisional value, then this is first
Step value substitutes into 3. formula and calculates immersion depth X, then by X substitution, 8. or 9. formula calculates accurate liquid level, flows further according to 1. calculating
Speed, to obtain more accurately result.
Compared with traditional float level meter, the mode for measuring liquid level is not required for liquid level and is in not flow regime, saves
Expense is built in high well logging and communicating pipe, and avoid due to log well and channel in flow rate of liquid difference and generate
Liquid level difference between well logging and channel.
Influence of the angle measurement error to level gauging, level sensor can using absolute optical encoder or
Absolute magnetic coder or obliquity sensor, when the immersion depth of bouyant wheel 1 remains unchanged, level gauging error EZDepending on coding
The angle measurement error E of deviceφ, as follows using its relationship when Fig. 1：
EZ = L * sin(φ) * Eφ,
When φ is equal to 90 degree, error is maximum, is EZmax = L * Eφmax。
Common absolute magnetic encoder angular measurement precision is up to 0.1 degree at present, if the long 1m of bar, liquid level maximum error of measuring
About 1.8mm can satisfy the requirement of most use occasions.
Currently used propeller type current meter is mainly made of rotation paddle, stature and empennage three parts, and rotation paddle is provided with signal
Contact and bearing shaft etc. can be rotated using flow dynamic drive rotor, inquire into flow velocity according to velocity of rotation.
The utility model possesses lower turn of tidal stream speed compared with propeller type current meter, plays the size and bouyant wheel 1 of turn of tidal stream speed
Diameter and thickness it is related, increasing by 1 diameter of bouyant wheel or thickness, can to have reduced turn of tidal stream fast, the bouyant wheel shaft diameter of the utility model,
The liquid thrust of receiving is suitable with propeller type current meter, and diameter is much larger than the diameter of propeller type current meter, thus power arm
Longer, motive torque is bigger, so having lower turn of tidal stream speed.
Preferably, some minor grooves can be done on 1 cylindrical surface of bouyant wheel, with increase with the friction of liquid level, make the rotation of bouyant wheel 1 with
Motion of melt surface synchronizes as early as possible, and can further decrease turn of tidal stream speed.
The above is only the preferred embodiment of the utility model, it should be understood that the utility model is not limited to herein
Disclosed form, should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and
Can be in contemplated scope described herein, modifications can be made through the above teachings or related fields of technology or knowledge.And this field
The modifications and changes that personnel are carried out do not depart from the spirit and scope of the utility model, then all should be in right appended by the utility model
It is required that protection scope in.
Claims (9)
1. a kind of measurement device suitable for liquid surface flow velocity, it is characterised in that：Including motion profile limiting mechanism, angular displacement
Detection device（2）, always float on liquid surface and can with liquid flow and the bouyant wheel of rotation（1）, clump weight（5）, the angle position
Move detection device（2）On the motion profile limiting mechanism, bouyant wheel（1）It is axially parallel to liquid level during rotation and hangs down
Directly in liquid flow direction, bouyant wheel（1）Immersion depth be X, and 0.02R<X<0.4R, wherein bouyant wheel（1）Radius be R, fortune
Dynamic rail mark limiting mechanism limits bouyant wheel（1）The track fixed along one is gone up and down, motion profile limiting mechanism with the change of liquid level
One end and bouyant wheel（1）Shaft be connected, the fixture above the other end and liquid surface（4）It is connected, the clump weight（5）With
The motion profile limiting mechanism is connected as one.
2. a kind of measurement device suitable for liquid surface flow velocity according to claim 1, it is characterised in that：The bouyant wheel
（1）Motion profile be straight line or camber line.
3. a kind of measurement device suitable for liquid surface flow velocity according to claim 1, it is characterised in that：The movement
Track limiting mechanism includes connecting rod（3）, the connecting rod（3）With the fixture（4）It is movably connected, the clump weight（5）With institute
State fixture（4）, connecting rod（3）It is connected as one.
4. a kind of measurement device suitable for liquid surface flow velocity according to claim 3, it is characterised in that：The fortune
Dynamic rail mark limiting mechanism further includes connecting rod stabilising arrangement, and the connecting rod stabilising arrangement is set to the fixture above liquid surface（4）
On.
5. a kind of measurement device suitable for liquid surface flow velocity according to claim 4, it is characterised in that：The company
Bar stabilising arrangement is by multiple fixed pulley groups（9）Composition, connecting rod（3）It is inserted through the gap between fixed pulley in groups.
6. a kind of measurement device suitable for liquid surface flow velocity according to claim 1, it is characterised in that：The fortune
Dynamic rail mark limiting mechanism includes sliding rail（6）And connecting rod（3）, connecting rod（3）One end more linear bearings are installed（7）, described straight
Spool is held（7）With sliding rail（6）Sliding is connected, the connecting rod（3）Pass through counterweight bracing wire（8）With the clump weight（5）It is connected, it is described
Sliding rail（6）It is fixed on ullage.
7. a kind of measurement device suitable for liquid surface flow velocity according to claim 1, it is characterised in that：It further include liquid
Level detecting apparatus, the liquid level detection device are set on the motion profile limiting mechanism.
8. a kind of measurement device suitable for liquid surface flow velocity according to claim 1, it is characterised in that：The bouyant wheel
（1）For body of revolution.
9. a kind of measurement device suitable for liquid surface flow velocity according to claim 1, it is characterised in that：The fixation
Object（4）For universal joint.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820671464.9U CN208156031U (en) | 2018-05-07 | 2018-05-07 | A kind of measurement device suitable for liquid surface flow velocity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820671464.9U CN208156031U (en) | 2018-05-07 | 2018-05-07 | A kind of measurement device suitable for liquid surface flow velocity |
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| CN208156031U true CN208156031U (en) | 2018-11-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108548936A (en) * | 2018-05-07 | 2018-09-18 | 冉乔文 | A kind of measurement device and method suitable for liquid surface flow velocity |
| CN117214461A (en) * | 2023-08-31 | 2023-12-12 | 江苏微之润智能技术有限公司 | Suspension wing type flow velocity meter calibration method based on fusion algorithm |
-
2018
- 2018-05-07 CN CN201820671464.9U patent/CN208156031U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108548936A (en) * | 2018-05-07 | 2018-09-18 | 冉乔文 | A kind of measurement device and method suitable for liquid surface flow velocity |
| CN117214461A (en) * | 2023-08-31 | 2023-12-12 | 江苏微之润智能技术有限公司 | Suspension wing type flow velocity meter calibration method based on fusion algorithm |
| CN117214461B (en) * | 2023-08-31 | 2024-04-09 | 江苏微之润智能技术有限公司 | Suspension wing type flow velocity meter calibration method based on fusion algorithm |
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