CN101413626B - Balance hole plate - Google Patents
Balance hole plate Download PDFInfo
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- CN101413626B CN101413626B CN2007101628446A CN200710162844A CN101413626B CN 101413626 B CN101413626 B CN 101413626B CN 2007101628446 A CN2007101628446 A CN 2007101628446A CN 200710162844 A CN200710162844 A CN 200710162844A CN 101413626 B CN101413626 B CN 101413626B
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- 239000012530 fluid Substances 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 abstract description 33
- 230000008569 process Effects 0.000 abstract description 30
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000002989 correction material Substances 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/02—Influencing flow of fluids in pipes or conduits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/42—Orifices or nozzles
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- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
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- Pipe Accessories (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a balance porous plate, comprising a plate which is suitable for being arranged in pipelines, extending and passing through the cross-section of the pipelines; the plate is provided with a plurality of through holes which have the same Reynolds number of fluids which pass through each through hole. The porous plate leads a process variable related to the fluid passing through the porous plate to be balanced when spanning the surface of the porous plate or a plurality of process variables to be arranged at a best balance state when spanning the surface of the porous plate, namely, the Reynolds numbers of fluids which pass through the surface of the porous plate are equal, thus improving the measurement precision.
Description
Technical field
The present invention relates to a kind of volume control device, particularly a kind of one or more process variable balances or impartial orifice plate that is associated with the fluid of fluid that in the xsect that is inserted into fluid, make through the plate surface.
Background technology
In the application of the fluid in numerous use pipelines, one or more variablees relevant with fluid (for example pressure, temperature, flow etc.) must be corrected or measure.Therefore, multiple orifice plate has been developed as flowmeter, flow-controlled device, restrictor or be used simply as flow regulator.Flow regulator can also be to be suitable for the mode correction fluid that process variable is measured.In U.S. Patent No. 5,295, No.397,5,341, No.848 and No.5 disclose three existing orifice plates designs in 529,093, will simply describe the content of described patent below.
The U.S. Patent No. 5,295,397 of authorizing people such as Hall discloses a kind of slit-like opening flowmeter that laterally is installed in the orifice plate in the pipeline that fluid flows through that has.Width and equal-sized slit-like opening are distributed in the central area.The quantity of the groove in the zone is proportional with the area that occupies with respect to the described zone of the entire area of plate.
The U.S. Patent No. 5,341,848 of authorizing Laws discloses a kind of flow regulator (being orifice plate) with a plurality of manholes.Described pore size distribution centers on the radially-arranged annular array of center circle through hole in a plurality of.Hole equidistant apart on each annular array and arrange around the center of plate, and on arbitrary annular array porosely have an identical diameter.In order to mate the velocity profile that is associated with the fluid that launches fully, the size in hole and quantity are for the increase along with the hole of given array radius disposed thereon improves to the flow impedance that caused by described plate.
Authorize people's such as Gallagher U.S. Patent No. 5,529,093 discloses the same flow regulator with a plurality of manholes (being orifice plate) of patent a kind of and Laws, and the zone that arrange in the hole comprises the central area and around the annular region of central area concentric arrangement.Fixed ratio is determined the area in hole to the basis in zone with the zone.The purpose of this design is to make liquid have disorderly structure and the flow velocity that launches fully.
Technology instruction formerly is not designed for the orifice plate of one or more process variable on balance or impartial and the whole plate of process surface.Usually, the poor efficiency that the process variable variations of orifice surface can cause that fluid flows of flowing through.For example, existing orifice plate has the very big pressure loss at fluid during to opposite side usually from orifice plate one effluent.The typical method that regrettably tackles this big pressure loss is to use more high-power and more expensive liquid pump.Simultaneously, the pressure gesture of existing orifice plate is consumed with unordered whirlpool turbulent flow usually at random.These whirlpool turbulent flows that form around orifice plate have reduced the linear and repeatable of any process variable measurement, therefore cause the reduction of measuring accuracy.The reduction of measuring accuracy causes in the process changing and differs, and this has increased again because the processing cost that the higher equipment operating cost that must keep causes raises.But,, can obviously reduce with unordered whirlpool turbulent flow at random if can be balanced or equalization through the pressure of orifice surface.Therefore, by the process variable equiulbrium flow with respect to measurement, the measuring accuracy of process variable is enhanced simultaneously-measured cost and descends.
Summary of the invention
Therefore, an object of the present invention is to provide a kind of orifice plate, this orifice plate is used to be installed in the pipeline, and wherein a process variable that is associated with fluid by the orifice plate surface that strides across orifice plate is balanced, and the surface that perhaps a plurality of process variable stride across orifice plate is set to the optimum balance state.
Other purposes of the present invention and advantage become more obvious by following instructions and accompanying drawing.
According to the present invention, a kind of orifice plate is provided, comprising: plate, described plate are suitable for being arranged in the pipeline and extend through the xsect of pipeline, and described plate has a plurality of through holes, and the Reynolds number that described a plurality of through holes form by the fluid of each through hole equates.
And then described a plurality of through holes comprise: the center circle through hole that is positioned at the plate center; Be positioned at through holes around a plurality of around the center circle through hole, described center circle through hole and a plurality of around through hole satisfy following relationship:
R
clV
cl＝R
chV
ch
Wherein:
R
ClRadius for the center circle through hole;
V
ClBe the flow velocity of the fluid in the pipeline in center circle through hole center;
R
ChFor arriving the distance at the center of through hole on every side in the slave plate center;
V
ChBe the rate of flow of fluid of through hole center around of the fluid in the pipeline.
The further embodiment according to the present invention, through hole is the oblique angle in each surface of described plate around each.
The longitudinal axis of through hole is parallel to the longitudinal axis of pipeline around each.
The further embodiment according to the present invention, through hole all is a circular port around each.Alternatively, through hole all is a deep-slotted chip breaker around each.
The further embodiment according to the present invention, described plate are circular.Described alternatively plate is a rectangle.
Description of drawings
Other purposes of the present invention, feature and advantage will become clearer by description and the accompanying drawing with reference to following preferred embodiment, and wherein corresponding label refers to corresponding parts in institute's drawings attached:
Fig. 1 installs the side view of the pipeline that has orifice plate of configuration for the typical case;
Fig. 2 is the planimetric map of the embodiment of orifice plate according to the present invention, wherein shows the common structure that is used in the pipeline with circular cross section;
Fig. 3 is the planimetric map of another embodiment of orifice plate according to the present invention;
Fig. 4 is the planimetric map of another orifice plate according to the present invention, wherein shows the through hole on every side that orifice plate has the deep-slotted chip breaker shape;
Fig. 5 is the planimetric map of another embodiment of orifice plate according to the present invention, wherein shows the common structure that is used in the pipeline with rectangular cross section;
Fig. 6 is the planimetric map of another embodiment of orifice plate according to the present invention;
Fig. 7 is the planimetric map of another embodiment of orifice plate according to the present invention;
Fig. 8 is the planimetric map of another embodiment of orifice plate according to the present invention;
Fig. 9 is the planimetric map of another embodiment of orifice plate according to the present invention;
Figure 10 is the planimetric map of another embodiment of orifice plate according to the present invention;
Figure 11 is the planimetric map of another embodiment of orifice plate according to the present invention;
Figure 12 is the planimetric map of another embodiment of orifice plate according to the present invention;
Figure 13 is a part of cross-sectional view of orifice plate, wherein shows the surface demarcation face of the hole-plate of inclination;
Figure 14 is the cross-sectional view of an orifice plate, and the hole of wherein said orifice plate becomes to arrange along being parallel to the pipeline longitudinal axis.
Embodiment
The present invention is a kind of modified orifice plate.Comprise having the hole that connect to form and will be installed in fluid at this term " orifice plate " so that fluid passes through any structure element (for example plate, dish, piece etc.) in described hole.This orifice plate can be used for flowmeter, can also be simply as being designed for the flow regulator that changes fluid (for example aligning flows, reduces the noise related with moving phase, reduces flow velocity etc.) in some way.
Use orifice plate of the present invention can provide process variable measurement more accurately and reduce cost in flowmeter.Orifice plate of the present invention reduces eddy current, turbulent shear and fluid flow pressure.In addition, orifice plate of the present invention comprises the reduction of improved repeatability, linearity and the pressure loss than the advantage of prior art.This orifice plate also with existing assembling and measuring system compatibility, therefore do not need special pipeline, instrument or computing method.
Figure 1 shows that and use the typical case of orifice plate of the present invention that configuration is installed.As previously mentioned, described orifice plate can control easily that fluid flows or measure one or more fluid process of flowing variablees as the part of flowmeter.Term " fluid " refers to comprise any flowable mass of steam or gas, homogeneity or non-homogeneous liquid and slurry here.
Among Fig. 1, pipeline 12 is connected in the junction by flange 3 and 5.Pipeline and be connected to prior art be can't help the present invention's restriction.At the fixing orifice plate 4 of flange 3 and 5, orifice plate 4 controls are by the stream (along arrow 6 directions) of the fluid of pipeline 1.Therefore orifice plate 4 by known technology typically laterally or be vertically set in the stream 6.
The size and dimension of orifice plate 4 can adapt to the pipeline 1 of various sizes shape.For example Fig. 2 aperture plate is circular so that it is installed on cylindrical pipe.Fig. 6 aperture plate is that rectangle is so that it is installed in the rectangular duct.
According to orifice plate 4 of the present invention, in the time of in being installed to pipeline, the blue 3 and 5 peripheral installation regions of clamping orifice plate 4, as shown in figure 14, peripheral installation region is equiulbrium flow district 4C with interior zone, and the external world in equiulbrium flow zone is to circumference 4D, and the through hole on the orifice plate 4 is distributed in the equiulbrium flow district.Need to prove that when not having center circle through hole 7, the central area of orifice plate 4 is center circle zone 7A and is represented by dotted lines, as shown in Figure 5.According to the present invention, the Reynolds number that through hole 8 forms in the pipeline fluid by through hole 8 around each around on the orifice plate 4 equates, thereby the surface that the process variable that fluid feasible and by orifice plate is associated strides across orifice plate is balanced, and the surface that perhaps a plurality of process variable stride across orifice plate is set to the optimum balance state.
For on the orifice plate 4 arbitrarily around through hole, the center of the Reynolds number N of the fluid by through hole around this and through hole on every side is directly proportional at the flow velocity V at R place product to the distance R and the fluid at orifice plate center, promptly N is directly proportional with R * V.For example, as Fig. 3 and shown in Figure 14, be R for the center of centre distance orifice plate 4
Ch1Around through hole 8, fluid flows through that the Reynolds number of through hole 8 is N around this
Rch1, flow velocity is V
Ch1, therefore, N
Rch1With R
Ch1* V
Ch1Be directly proportional.In like manner, the center for centre distance orifice plate 4 is R
Ch2Around through hole 8, fluid flows through that the Reynolds number of through hole 8 is N around this
Rch2, flow velocity is V
Ch2, therefore, N
Rch2With R
Ch2* V
Ch2Be directly proportional.
Therefore, according to the present invention, 8 designs of through hole on every side on the orifice plate 4 are satisfied:
R
ch1×V
ch1＝R
ch2×V
ch2 (1)
The Reynolds number that flows through the fluid of through hole around each equates, thereby the surface that the process variable that fluid feasible and by orifice plate is associated strides across orifice plate is balanced, the surface that perhaps a plurality of process variable stride across orifice plate is set to the optimum balance state, has improved the precision of utilizing orifice plate 4 to measure.
Need to prove that for the center circle through hole 7 that is positioned at orifice plate 4 centers, fluid flows through the Reynolds number N of this center circle through hole 7
RclRadius R with center circle through hole 7
ClFlow velocity V with fluid flow through orifice plate center
ClBe directly proportional.
Therefore, as long as the via design on the orifice plate 4 of the present invention satisfies R
Cl* V
Cl=R
Ch* V
Ch=R
Ch2* V
Ch2, just can make the Reynolds number of the fluid that flows through each through hole equate substantially, as shown in Figure 2.
Below with reference to the orifice plate 4 of Fig. 2 description according to first embodiment of the invention.
As shown in Figure 2, orifice plate 4 according to first embodiment of the invention is formed with the center circle through hole 7 that is positioned at the center and is positioned at center circle through hole 7 a plurality of through holes 8 on every side on every side, and in the embodiment shown in Fig. 2, the number of through hole 8 is 4 and all is circular hole on every side, yet the present invention is not limited to this.
According to first embodiment of the invention, the through hole on the orifice plate 4 (center circle through hole 7 and through hole 8) on every side satisfies following fundamental relation in the distribution of equiulbrium flow district 4C:
R
clV
cl＝R
chV
ch (2)
Wherein:
R
ClRadius for the center circle through hole;
V
ClBe the flow velocity that (that is the center of orifice plate) located at center circle through hole center of the fluid in the pipeline;
R
ChFor arriving the distance at the center of through hole on every side in the slave plate center;
V
ChBe the rate of flow of fluid of through hole center around of the fluid in the pipeline.
Fluid internal diameter of the pipeline to speed respectively formula be:
V/V
cl＝((1-R)/R
w)
1/m (3)
Wherein:
V
ClBe the pipe flow velocity of pipeline inner fluid at the center of pipeline,
R
wBe the internal diameter of pipeline,
M is the function f (N) about Reynolds number, and this function is an empirical function, depends on different fluid etc.
Therefore derive: the radius of center circle through hole and through hole on every side are to the satisfied relation of the distance at plate center.
R
ch/R
cl＝V
cl/V
ch
＝(V
cl((1-R
cl)/R
w)
1/m)/(V
cl((1-R
ch)/R
w)
1/m)
＝(1-R
cl)
1/m/(1-R
ch)
1/m) (4)
According to the first embodiment of the present invention, when the Reynolds number that satisfies them when center round tube hole and the design of through hole on every side equates, then the center circle through hole and on every side the area of through hole and pipeline satisfy following relationship:
πR
cl 2+nπR
ch 2＝πβ
2R
w 2
Wherein:
R
wRadius for pipeline;
N is that centre distance orifice plate center is R
ChAround the number of through hole,
β=(A
Institute is porose/ A
Pipeline)
1/2(5)
A
Institute is poroseFor the area of all through holes on the orifice plate and,
A
PipelineCross-sectional area for pipeline
Derive thus:
1+n(R
ch/R
cl)
2-β
2(R
w/R
cl)
2＝0 (6)
Fig. 3 shows the floor map of orifice plate 4 according to another embodiment of the present invention.
In Fig. 3, orifice plate 4 is formed with center circle through hole 7 and is positioned at a plurality of through holes 8 on every side of center circle through hole 7 peripheries.Through hole 8 is divided into two groups on every side, and the distance at the centre distance orifice plate center of through hole 8 is R around interior group of week
Ch2, the distance at the centre distance orifice plate center of through hole is R around outer group week
Ch1
Equally, the via design on the orifice plate 4 equates for satisfying the Reynolds number that flows through each through hole.With embodiment illustrated in fig. 2 different be that two radiuses that are centered close to of through hole 8 are respectively R on every side
Ch1And R
Ch2Two circumference on.
Fig. 4 shows the planimetric map of the orifice plate 4 of another embodiment of the present invention, and orifice plate 4 has central circular through hole 7 and is positioned at central circular through hole 7 through hole 8 on every side on every side.With Fig. 2 with embodiment illustrated in fig. 3ly different be, among the embodiment shown in Fig. 4, the form of through hole 8 is a deep-slotted chip breaker on every side, and the distance at the longitudinal center linear distance orifice plate center of deep-slotted chip breaker is R
Ch
Fig. 5 shows orifice plate 4 according to another embodiment of the present invention, on the orifice plate 4 around through hole be divided into two groups, to lay respectively at radius be R at the center of through hole around two groups
Ch1And R
Ch2Circumference on, this point is identical with the embodiment shown in Fig. 3.Different with the embodiment shown in Fig. 2-4 is that the orifice plate 4 shown in Fig. 5 does not form central circular through hole 7.
Fig. 6 is the planimetric map of another embodiment of orifice plate 4 according to the present invention, and the orifice plate 4 shown in Fig. 6 has rectangular cross section, is used in the pipeline with rectangular cross section.It is consistent with orifice plate 4 shown in Figure 2 that the through hole of orifice plate 4 shown in Figure 6 forms pattern.
With reference to the accompanying drawings the orifice plate according to the embodiment of the invention is described above.Need to prove that in the embodiment shown in Fig. 2-3 and the 5-6, through hole 8 forms 4 circular ports on every side; Among the embodiment shown in Fig. 4, through hole forms 4 deep-slotted chip breakers on every side; Through hole is divided into two groups around in Fig. 3 and Fig. 5, and to lay respectively at radius be R at the center of through hole around two groups
Ch1And R
Ch2Circumference on, yet, the present invention is not limited to this, through hole can form any suitable quantity around the orifice plate 4, and for example 6,8, the center of through hole can lay respectively on the circumference of a plurality of radiuses on every side, the form of through hole can be inconsistent around on the orifice plate 4, and for example one group of through hole can be circular port, and another group can be for deep-slotted chip breaker etc.In addition, the shape of orifice plate 4 also is not limited to rectangle and circle, and according to the shape of cross section of used pipeline, the shape of orifice plate 4 can be any suitable geometric configuration.
As shown in figure 13, through hole is formed with oblique angle 8A at each surperficial 4A place of orifice plate 4 on every side.Certainly, the present invention is not limited to this, and oblique angle 8A also can be the right angle.
Partial sectional view when Figure 14 shows orifice plate 4 and is used in the pipeline, the flow rate of fluid of the center circle of wherein flowing through through hole 7 is V
Cl, flowing through on every side, the flow rate of fluid of through hole 8 is V
Ch, and the longitudinal axis of through hole 8 is parallel to the longitudinal axis of pipeline around each.
Therefore,, equate substantially, for example, satisfy formula 1-2 and 4-6 in the foregoing description as long as their Reynolds number of fluid of flowing through is satisfied in the design of the through hole on the orifice plate according to the present invention.
Based on the balance principle that Reynolds number equates substantially, the through-hole aperture of orifice plate and position also can draw by approximate formula.For example, with reference to figure 7-12, the formula that below provides:
A wherein
R Balanced flow zone 4C ends, the area summation in the hole of center on radius R ch in order to play from the center of center circle zone 7A;
X
RFor being the coefficient of flow on the circumference of Rch at radius, it equals (pK)
R, p wherein
RFor flow through the density of the fluid of pipeline 10, K at radius R ch place
RFor flowing through the mobile correction factor of the fluid of pipeline 10 at radius R ch place, in this coefficient and hydrodynamic force, kinergety, energy density, volumetric flow rate, the flow etc. is relevant;
V
RBe the speed of the fluid of the pipeline of flowing through at radius R ch place, technology wherein as formerly, flow velocity is followed based on the known allocation function that comprises factors such as particular fluid outflow, line size/shape;
B is for being used to that at least one (relevant with the fluid of the pipeline of flowing through) process variable is equated at each radius R ch place or the constant of " equilibrium ", wherein b is an arbitrary value, but generally (b is generally 1 during for example when flow equalization at-5 to+5, when power or velocity head (velocity head) equilibrium, although the different correction factor K that flow can be used for each example, b is generally 2 etc.), and
A is for to equal (X at each radius R ch place
RA
RV
R b) constant.
Based on rate of flow of fluid, coefficient of flow X
RCan be used as constant or change because of orifice surface.Particularly, work as X
RProduct (i.e. (pK)
R) variation during greater than the set upper limit of orifice plate zones of different, X
RCoefficient is variable.
In the example that has only a process variable to consider, constant b is chosen so that this process variable is equated or individual equilibrium value.If more than one process variable need be paid close attention to, the value of b is chosen to reach optimum efficiency so that cross over equalization or the equilibrium of the Cheng Bianliang (those need be considered) in orifice plate balanced flow zone.For balanced all process variable that need consider of optimization, the absolute equalization of single process variable needs by compromise.As a result of, balanced a plurality of process variable will reach about equalization each will cross over the process variable degree in orifice plate balanced flow zone according to the present invention.
Hole area sum total A
RThe difference of arranging according to the hole and by different definition, its arrange be divided into usually two different classes of.Being centered close on the radius R ch of first kind finger-hole shape structure (for example circular hole, arc-shaped slot), hole are distributed in the 4C of balanced flow zone discretely.The second class hole shape structure refers to the only area in the whole holes on radius R ch, and wherein each hole extends to circumference 4D from the circumference of center round tube hole 7.
Do not consider the distributed architecture in hole, the orifice flow total area A that orifice plate 4 provides
TotalFlow area A with pipeline
PipeRatio can calculate by following known formula,
A
Total/A
pipe＝(1+Q)
-1/2 (8)
Q＝2G
cpΔp(C
oYA
pipe/M)
2 (9)
G wherein
cNewton's conversion constant
P is a fluid density,
Δ p is the different measuring pressure of orifice plate,
C
oBe orifice constant,
Y is an expansion coefficient, is generally used for compressible fluid, and
M is a mass rate.
Equation (8) and (9) are from " unit operations of chemical engineering, the 5th edition, " McGraw-Hill of people such as McCabe, Inc., NY, 1983, p.222 in direct derivation go out, its content is by reference.
Utilize orifice flow total area A
Total, the total area of orifice plate balanced flow zone 4C is
A
TOTAL-A
RO＝A
R1+A
R2+...+A
Rn (10)
A wherein
RO(i) when center circle zone 7A does not have the hole, be 0, (ii) when radius be the single center circle through hole of Rcl when being positioned at center circle zone 7A, be 2 π Rcl, the (iii) total area in a plurality of holes in the regional 7A of center circle.The radius of the single center circle through hole in the 7A of center circle zone can be (comprising) Rcl to the maximum.
Fig. 7-9 is depicted as the embodiment of described first kind hole shape structure distribution in the 7A of center circle zone.These examples can not be represented special circumstances, but the general arrangement based on the hole of radius-radius mode is described.Each example is based on the use of through hole 8 on every side.The diameter of through hole is identical around on certain radius, but satisfies the restriction of equation (7) definition, and then its diameter does not need identical.Usually satisfy equation (7), then the hole can have any shape.The diameter Dch of the discrete circular hole of the unification of center on given radius R ch can calculate by following equation
Dch＝2(A
Rch/N)
1/2 (11)
A wherein
RchFor all are centered close to the area in the hole on the radius R ch,
N is the preferred amount that is centered close to the hole on the radius R ch.
Among Fig. 7, the center-aligned of through hole around the center of the through hole on every side on each radius R ch and the hole on other radiuses.Arrange with the off(-)center that is closing on the through hole on every side on the radius at the center of through hole 8 around among Fig. 8 on each radius R ch.Not being centered close to the through hole on every side that closes on the radius in Fig. 7 and 8 overlaps.But among Fig. 9, some are centered close to the through hole on every side that closes on the radius and overlap each other.
Figure 10 shows that another embodiment of the discrete hole of first kind hole shape structure, be centered close to the circular arc type slit-like opening on the radius R ch.Circular arc type slit-like opening 8 has circular paragraph header that diameter is D (promptly semicircle) and groove width D.Because circular arc type slit-like opening 8 is centered close to radius R ch, groove width D calculates by following equation
α=360/2S wherein,
S is the quantity of groove on given radius R ch, and
A
RchFor being centered close to the whole groove areas on the radius R ch.
Groove on given radius equidistantly or not equi-spaced apart distributes and does not exceed the scope of the invention.Identical with above-mentioned circular hole, the arrangement of can aliging or misplace of the groove on the adjacent radius.As long as satisfy equation (7) in addition, groove can be difformity and size.
Figure 11 and 12 is depicted as the orifice plate embodiment that is distributed in balanced flow zone 4C according to the above-mentioned second class pass.In addition among each embodiment, the hole extends to or near the circumference 4D of balanced flow zone 4C from center circle zone 7A.Embodiment is in order to illustrate the shape and the position in hole generally speaking.Among each embodiment, the area of through hole 8 is accompanyed or follow the radial distance of center circle zone 7A increase and is increased on every side.Equation calculated below radian Sch on radius R ch passed through
Sch＝{ARch/(2Rch+ΔR)+A
(Rch+1)+ΔR)}/2NΔR (13)
Wherein Δ R is the radical length variation of Rch to Rch+ 1
N is the preferred amount of through hole 8 on every side that is formed on the orifice plate 4.
Do not exceeding the scope of the invention, additive method also can be used for calculating radian Sch.Among Figure 11,8 V-types in hole, Figure 12 mesopore 8 is expansion geometric form shape.
Above-mentioned formula (6)-(13) are based on the balance principle that Reynolds number equates substantially, divide and computing center circle zone and balanced flow region apertures area, and use can make a process variable relevant with Reynolds number equate at each radius R ch place at least or the constant of " equilibrium ", comes standard and calculates the size of orifice bore and an embodiment of distribution.
As mentioned above, orifice plate of the present invention can " former state " be used for simple adjustment stream.In addition, also can finish " apparatus measures " of measuring the process variable that spreads all over orifice plate with one or more sensors.The radial dilatation hole can form by boring on orifice plate, and carries out apparatus measures with the interior sensor that is contained on the sidewall of hole.Measure hardware like this and be not in the flow field fully.The traditional measurement method that attention is measured at the orifice plate upstream and downstream also can use.
Advantage of the present invention is numerous.But can make balance (the covering the equiulbrium flow zone) process variable relevant simply with fluid by several different methods.Compare with traditional orifice plate, advantage of the present invention comprises that improved measuring accuracy, more excellent pressure recover and low noise produces.The present invention can also reduce the permanent compression loss of one side of plate to another side in addition.Therefore pass through the orifice plate needs suction energy still less of prior art by the fluid ratio of orifice plate of the present invention.The present invention can be used for widely in the fluid flow applications.
Though some embodiments of the present invention have been described with reference to the drawings, it will be apparent to those skilled in the art that under the situation that does not break away from claim restricted portion of the present invention, can carry out many variations and modification.
Claims (7)
1. orifice plate comprises:
Plate, described plate are suitable for being arranged in the pipeline and extend through the xsect of pipeline, and described plate has a plurality of through holes, and the Reynolds number that described a plurality of through holes form by the fluid of each through hole equates substantially;
Wherein said a plurality of through hole comprises:
Be positioned at the center circle through hole at plate center; With
Be positioned at center circle through hole a plurality of through holes on every side on every side, described center circle through hole and a plurality of through hole on every side satisfy following relationship:
R
clV
cl＝R
chV
ch
Wherein:
R
ClRadius for the center circle through hole;
V
ClBe the flow velocity of the fluid in the pipeline in center circle through hole center;
R
ChFor arriving the distance at the center of through hole on every side in the slave plate center;
V
ChBe the rate of flow of fluid of through hole center around of the fluid in the pipeline.
2. orifice plate according to claim 1, wherein through hole is the oblique angle in each surface of described plate around each.
3. orifice plate according to claim 1, wherein the longitudinal axis of through hole is parallel to the longitudinal axis of pipeline around each.
4. orifice plate according to claim 1, wherein through hole all is a circular port around each.
5. orifice plate according to claim 1, wherein through hole all is a deep-slotted chip breaker around each.
6. orifice plate according to claim 1, wherein said plate are circular.
7. orifice plate according to claim 1, wherein said plate are rectangle.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101628446A CN101413626B (en) | 2007-10-15 | 2007-10-15 | Balance hole plate |
| PCT/CN2008/001717 WO2009062379A1 (en) | 2007-10-15 | 2008-10-10 | A balanced orifice plate |
| RU2010116060/28A RU2451908C2 (en) | 2007-10-15 | 2008-10-10 | Balanced measuring diaphragm |
| EG2010040587A EG25408A (en) | 2007-10-15 | 2010-04-11 | A balanced orifice plate-plaque a orifices symetriques. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101628446A CN101413626B (en) | 2007-10-15 | 2007-10-15 | Balance hole plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101413626A CN101413626A (en) | 2009-04-22 |
| CN101413626B true CN101413626B (en) | 2011-03-16 |
Family
ID=40594289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101628446A Active CN101413626B (en) | 2007-10-15 | 2007-10-15 | Balance hole plate |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN101413626B (en) |
| EG (1) | EG25408A (en) |
| RU (1) | RU2451908C2 (en) |
| WO (1) | WO2009062379A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103153477B (en) * | 2010-09-09 | 2016-04-27 | 威尔斯格尔文分形技术有限责任公司 | Fractal orifice plate |
| CN101949780A (en) * | 2010-09-26 | 2011-01-19 | 江苏万工科技集团有限公司 | Jet loom auxiliary nozzle jet stream testing device |
| US9200650B2 (en) * | 2013-09-26 | 2015-12-01 | Paul D. Van Buskirk | Orifice plates |
| CN108225449A (en) * | 2016-12-14 | 2018-06-29 | 国家电投集团科学技术研究院有限公司 | There is the throttling set blocked, resistance regulation and flow pattern adjust |
| CN109141899B (en) * | 2017-06-27 | 2021-03-02 | 中国航发商用航空发动机有限责任公司 | Combustion chamber test device with pore plate |
| CN107478284A (en) * | 2017-08-30 | 2017-12-15 | 华南理工大学 | A kind of new isometrical multi-hole orifice adjuster |
| WO2019161716A1 (en) | 2018-02-23 | 2019-08-29 | 南京亿准纳自动化控制技术有限公司 | Throttling component and rectification and flow measurement device |
| CN110487338B (en) * | 2019-08-29 | 2020-11-03 | 东南大学 | Design method and evaluation method of porous balance pore plate |
| CN111735508A (en) * | 2020-07-15 | 2020-10-02 | 艾加流体控制(上海)有限公司 | Radiation type slot type orifice plate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5341848A (en) * | 1989-07-20 | 1994-08-30 | Salford University Business Services Limited | Flow conditioner |
| US5529093A (en) * | 1994-01-31 | 1996-06-25 | Integrity Measurement Partners | Flow conditioner profile plate for more accurate measurement of fluid flow |
| CN1190602C (en) * | 1998-03-13 | 2005-02-23 | 法国天然气公司 | Flow conditioner for gas transport pipe |
| US7051765B1 (en) * | 2003-12-19 | 2006-05-30 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Balanced orifice plate |
| CN2935097Y (en) * | 2006-07-18 | 2007-08-15 | 中国石油天然气集团公司 | Slotted orifice plate for multiphase metering device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2047096C1 (en) * | 1992-06-02 | 1995-10-27 | Худайберген Алланиязов | Flowmetering diaphragm |
| CN201104248Y (en) * | 2007-06-01 | 2008-08-20 | 上海科洋科技发展有限公司 | Aperture plate |
-
2007
- 2007-10-15 CN CN2007101628446A patent/CN101413626B/en active Active
-
2008
- 2008-10-10 RU RU2010116060/28A patent/RU2451908C2/en not_active IP Right Cessation
- 2008-10-10 WO PCT/CN2008/001717 patent/WO2009062379A1/en active Application Filing
-
2010
- 2010-04-11 EG EG2010040587A patent/EG25408A/en active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5341848A (en) * | 1989-07-20 | 1994-08-30 | Salford University Business Services Limited | Flow conditioner |
| US5529093A (en) * | 1994-01-31 | 1996-06-25 | Integrity Measurement Partners | Flow conditioner profile plate for more accurate measurement of fluid flow |
| CN1190602C (en) * | 1998-03-13 | 2005-02-23 | 法国天然气公司 | Flow conditioner for gas transport pipe |
| US7051765B1 (en) * | 2003-12-19 | 2006-05-30 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Balanced orifice plate |
| CN2935097Y (en) * | 2006-07-18 | 2007-08-15 | 中国石油天然气集团公司 | Slotted orifice plate for multiphase metering device |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2451908C2 (en) | 2012-05-27 |
| CN101413626A (en) | 2009-04-22 |
| EG25408A (en) | 2011-12-28 |
| WO2009062379A1 (en) | 2009-05-22 |
| RU2010116060A (en) | 2011-11-20 |
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