WO2009062379A1 - A balanced orifice plate - Google Patents

A balanced orifice plate

Info

Publication number
WO2009062379A1
WO2009062379A1 PCT/CN2008/001717 CN2008001717W WO2009062379A1 WO 2009062379 A1 WO2009062379 A1 WO 2009062379A1 CN 2008001717 W CN2008001717 W CN 2008001717W WO 2009062379 A1 WO2009062379 A1 WO 2009062379A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
plate
hole
orifice
around
flow
Prior art date
Application number
PCT/CN2008/001717
Other languages
French (fr)
Chinese (zh)
Inventor
Paul D. Van Buskirk
William A. Heenan
Original Assignee
Keyontechs Development Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15DFLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00Influencing flow of fluids
    • F15D1/02Influencing flow of fluids in pipes or conduits
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
    • G01F1/05Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects
    • G01F1/34Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the 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
    • G01F1/40Details or construction of the flow constriction devices
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
    • G01F1/05Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects
    • G01F1/34Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the 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
    • G01F1/40Details or construction of the flow constriction devices
    • G01F1/42Orifices or nozzles

Abstract

A balanced orifice plate includes a plate (4) which is suitable for installing in a pipe (1) and extends through the cross-section of the pipe (1). Said plate (4) has multiple through-holes (7, 8) which are formed so that the fluid passing through each through-hole has generally the same Reynolds number.

Description

FIELD balancing plates

The present invention relates to a flow control device, particularly to a fluid when inserted into the inner cross section of the fluid so that the fluid through a surface of the plate associated with the one or more process variables balance or equivalent orifice. Background technique

Application of the fluid in the use of many of the conduit, one or more variables associated with the fluid (e.g., pressure, temperature, flow, etc.) must be corrected or measured. Thus, various have been developed as the orifice plate flow meter, flow control, a flow restrictor, or simply as a flow regulator. The flow regulator also in a manner adapted to process variable measurement correction fluid. In U.S. Patent No. 5, 295, No. 397, 5, 341, No. 848 and No. 5, 529, 093 discloses a conventional three plate designs, the disclosures will be briefly described below.

Hal l Grant et al., U.S. Pat. No. 5, 295, 397 discloses a plate having a transversely mounted in the fluid flow through the conduit slot-like aperture flowmeter. Of equal width and size of the slot-like holes distributed in the central region. The number of slots in the region of phase is proportional to the area of ​​the entire area of ​​the region occupied by the plate.

U.S. Patent Laws Grant No. 5, 341, 848 flow regulator (i.e., plate) is disclosed having a plurality of circular through-holes. The plurality of holes distributed on the annular array around a central distribution tact aperture. Each annular array of holes are equally spaced apart and arranged around the central plate, and all the holes having an annular array of any of the same diameter. In order to match the velocity profile associated fluid fully deployed, the size and number of holes for the flow impedance caused by the plate increases with a given array of apertures arranged thereon radius increases.

Gal lagher Grant et al., U.S. Pat. No. 5, 529, 093 discloses a Patent Laws and the same flow regulator (i.e., plate) having a plurality of circular through-holes, and hole arrangement comprising a central region and a surrounding region a central region arranged concentric annular region. In fixed ratio to the base area of ​​the region area of ​​the holes is determined. The purpose of this design is that the flow rate of the liquid having a disordered structure and a fully deployed.

No prior art teaches or equivalent designed for balancing plate with a whole plate surface via one or more process variables. Typically, flow through the orifice surface of the process variable change will cause fluid flow inefficiencies. For example, the conventional orifice plate usually have a lot of pressure loss when the fluid flows from the other side of the side plate. Unfortunately, the typical way to deal with such a large pressure loss is to use a more powerful and more expensive liquid pump. Meanwhile, the potential existing pressure plate is typically disorderly and random vortex turbulence consumption. These turbulent vortex formation around the orifice reduces any process variable measurement linearity and repeatability, resulting in a decrease of the measurement accuracy. Reduce the measurement accuracy of the process of change leading to different, which in turn increases the processing costs due to the higher operating costs of equipment must be maintained due to rise. However, if the balance can through the pressure equalization orifice surface or randomly disordered and vortex turbulence can be significantly reduced. Thus, by measuring the process variable with respect to the equilibrium flow, the measurement accuracy is improved process variable measurements while the cost is reduced. SUMMARY

It is therefore an object of the present invention is to provide an orifice plate for mounting in the pipe, wherein a fluid through a process variable associated with the orifice plate across the surface are balanced, or more processes across the surface of the variable orifice is set to the optimum balance.

Other objects and advantages of the present invention by the following specification and drawings become more apparent. According to the present invention, there is provided a well plate comprising: a plate adapted to be disposed within the duct cross-section and extending through the conduit, said plate having a plurality of through holes, a plurality of through-holes are formed through Reynolds number of the fluid equal to each through-hole.

Further, a plurality of through-holes comprising: a central circular through-hole of the center plate; and a plurality of through holes located around the periphery of the central circular through-hole, said central hole and a plurality of tact around the through hole satisfies the following relationship

I is the distance from the plate center to center around the through hole;

Vch is the fluid within the conduit around the through hole at the center of the fluid flow rate.

According to a further embodiment of the present invention, around each through hole is beveled at each surface of the plate.

Around the longitudinal axis of each through hole parallel to the longitudinal axis of the conduit.

According to a further embodiment of the present invention, each of the through-holes are circular around the hole. Alternatively, the through-hole around each slot are arcuate.

According to a further embodiment of the present invention, the plate is circular. Alternatively, the plate is rectangular. BRIEF DESCRIPTION

Other objects, features and advantages of the present invention and the accompanying drawings described embodiments will become more apparent by reference to the following description of preferred, wherein all of the drawings, corresponding reference numerals refer to corresponding parts throughout:

Figure 1 is a side view of a pipe with a typical installation configuration of the plate;

FIG 2 is a plan view of a plate according to an embodiment of the present invention, showing a configuration generally used in the conduit has a circular cross-section;

FIG 3 is a plan view of the plate according to another embodiment of the present invention;

FIG 4 is a plan view of another plate of the present invention, which shows a plate having an arc-shaped groove around the through hole;

FIG 5 is a plan view of the plate according to another embodiment of the present invention, showing a configuration of generally rectangular cross-section of the inner pipe have used;

FIG 6 is a plan view of the plate according to another embodiment of the present invention;

FIG 7 is a plan view of the plate according to another embodiment of the present invention;

FIG 8 is a plan view of the plate according to another embodiment of the present invention;

FIG 9 is a plan view of the plate according to another embodiment of the present invention;

FIG 10 is a plan view of the plate according to another embodiment of the present invention;

FIG 11 is a plan view of the plate according to another embodiment of the present invention;

FIG 12 is a plan view of the plate according to another embodiment of the present invention;

FIG 13 is a cross sectional view of a portion of the orifice, wherein the orifice is shown inclined interface surface;

FIG 14 is a cross-sectional view of an orifice, wherein said orifice plate in a direction parallel to the longitudinal axis of the pipe arrangement. detailed description

The present invention is an improved orifice plate. The term "plate" includes having a through hole is formed and the fluid to be attached to any structural member of the fluid through the apertures (such as a plate, disc, block, etc.). The orifice meter can be used, as can also be designed for a simple change in the fluid in some way (e.g. DC correction, reducing the noise associated with the flow, reducing the flow rate, etc.) of the flow regulator.

In the present invention using the orifice flow meter can provide a more accurate measurement of process variables and cost. The present invention reduces swirl orifice, shearing and turbulent fluid flow pressure. Further, the present invention orifice advantage over the prior art including improved reproducibility decreases linearly and the pressure loss. The orifice plate assembly and is also compatible with existing measuring systems, and therefore does not require special pipe, calculation methods or tools.

Figure 1 shows a typical configuration using the mounting plate of the present invention. As previously described, the plate can be easily controlled or as part of a fluid flow measuring one or more process variable fluid flow meter. The term "fluid" as used herein refers to any substance comprises a vapor or gas flow, homogenous or non-homogenous liquids and slurries.

In FIG. 1, the pipes 1 and 52 3 are connected by means of flanges at the joint. And a connection duct prior art, are not limiting the present invention. 3 and the flange 5 fixed plate 4, the orifice plate 4 controls the flow of fluid through the conduit 1 (in the direction of arrow 6). Thus the orifice plate 4 by known techniques typically laterally or vertically arranged in the stream 6.

The size and shape of the orifice plate 4 may be of various size and shape adapted to the pipe 1. For example in Figure 2 for a circular plate which is attached to a cylindrical pipe. FIG 6 is a rectangular plate which is mounted to the rectangular conduit.

The orifice plate 4 according to the invention, when mounted to the duct, and blue 3 4 5 sandwiched orifice peripheral mounting region 14, a region within the peripheral mounting region 4C balanced flow area, flow balance region outside circumference to 4D, the through-hole 4 of balancing the flow distribution plate area. Incidentally, when 7, a central region without a central circular through-hole 4 of the plate 7A and the central circle region indicated by dotted lines, as shown in FIG. According to the present invention, the orifice plate around the through hole 48 is formed by a Reynolds number equal to the fluid around each through hole 8 of the duct, crossed by the orifice plate so that a process variable associated fluid orifice plate surface is balanced, or more process variables across the surface of the orifice plate is set to the optimum balance.

For any of the plate around the through hole 4, the distance R and the central orifice of the fluid flow rate V R proportional to the product at the periphery of the central through hole through which the fluid around the through hole Reynolds number N, i.e., N proportional to the RXV. For example, FIGS. 3 and 14, the center plate 4, 8 from the center, the Reynolds number of the fluid flowing around the through hole 8 is N rchl R ehl around the through hole to a flow rate of V chl, therefore, N rchl with! ^ ^ ^ Proportional. Similarly, around the through hole for the center to center distance of the orifice plate 4 8 R ch2, the Reynolds number of the fluid flowing around the through hole 8 is N rch2, flow rate V ch2, therefore, N rch2 and! ^ ^ ^ Proportional.

Thus, according to the present around the through hole in the invention, designed to meet the 48-well plate:

Rchl X c hl = c h2 X c h2 (1

Equal flow through each of the through holes around the Reynolds number of the fluid, so that the surface of the orifice plate across the fluid through a process variable associated with the orifice plate across the surface of balance, or more process variables is provided as the best balance, improve the accuracy of measuring the use of the orifice plate 4.

Incidentally, the orifice plate 4 is located in the center of the central circular through-hole 7, the fluid flow through the central circular through-hole and a Reynolds number N rcl center of radius RP 7 tact fluid flow rate through hole 7 V cl center plate proportional.

Thus, as long as the through-hole 4 of the plate according to the present invention is designed to meet R cl XV cl = R ch XV ch =

It can be such that the Reynolds number of the fluid flowing through each through-hole is substantially equal, as shown

2 is described below with reference to FIG orifice embodiment of the present invention, the first embodiment 4.

2, has a central circular through-hole 7 at the center and a plurality of through holes located around the periphery of the central circular through-hole 7 8 4 plate formed of a first embodiment of the present invention, in the embodiment shown in FIG. 2 number is around the through hole 4 and 8 are round holes, however, the present invention is not limited thereto. According to a first embodiment of the present invention, plate 4 through hole (circular through-hole center and around the through hole Ί

8) the distribution equilibrium flow area substantially satisfy the following relation. 4C:

RciV c i = Rch C h ( 2)

among them:

R cl is the radius of the central circular through-hole;

In the center of the central circular through-hole (i.e., the center of the orifice plate) at a flow rate of v cl within a fluid conduit;

I is the distance from the plate center to center around the through hole;

Vc h is the fluid within the conduit around the through hole at the center of the fluid flow rate. The inner diameter of the fluid conduit speeds formula:

V / V cl = ((lR ) / R w) 1 / m (3)

among them:

Line fluid flow within the tube in the center tube,

! ^ Is the inner diameter of the pipe,

M is a function f on the Reynolds number (N), the function is a function of experience, depending on the fluids.

Thus deduced: Relationship radius around the through hole of the central circular through-hole from the center of the plate to meet.

= (V c i ((l -Rci) / R w) 1 / m) / (V cl ((lR ch) / RJ 1 / m)

When = (l-Rci) 1 / m / (1-Rch) 1 / m) (4) according to a first embodiment of the present invention, when the design of the central circular through-hole and around the through hole satisfies the Reynolds number thereof is equal, then circular through-hole and the area around the through hole and the center of the pipe satisfies the following relationship:

Wherein: ^ is the radius of the conduit;

n is from orifice center to center around the through hole of the number of I,

β = (Α all holes / Α pipe) 1/2 (5)

A is the area of ​​all the grip orifice plate and through-holes,

[Alpha] «cross-sectional area of ​​the conduit

Derived therefrom:

1 + n (R ch / R cl) 2 - β 2 (R w / R cl) 2 = 0 (6)

FIG. 3 shows a schematic plan view of another embodiment of the plate according to the present invention 4.

In Figure 3, the orifice plate 4 is formed with a central circular through-hole 7, 7 and the outer periphery of a plurality of circular through-hole in the center around the through hole 8. Divided into two groups around the through hole 8, the center of the inner periphery around the through hole 8 set distance from the center of the orifice is I 2, the through holes around the center of the outer periphery of the group as a center orifice distance ϋ ω.

Similarly, the through hole 4 is designed to meet the orifice Reynolds number flows through each through hole is equal. Different embodiment shown in FIG. 2 embodiment, the central through-hole 8 is located around the two radii! ^ Mouth

I 2 of the circumference of the two.

FIG 4 shows a plan view of another embodiment of the orifice plate 4 of the present invention, the orifice plate 4 has a central circular through hole 7, and positioned around the center around the through hole 7 of the circular through hole 8. Unlike in the FIGS. 2 and 3 embodiment is the embodiment shown in Figure 4, around the through hole 8 in the form of arcuate slots, the center orifice distance from the longitudinal centerline of the arcuate grooves is I.

FIG. 5 shows a 4, around the through hole on the perforated plate divided into 4 groups according to another embodiment of the orifice plate of the present invention, the through holes around the center of the two groups are located radius Rc hl and R.h2 on the circumference, which is shown in FIG. 3 the same embodiment. 2-4 with the embodiment illustrated in FIG different embodiment is shown in FIG. 5 has no center plate 4 a circular through hole 7 is formed.

6 is a plan view of another embodiment of the present invention, the orifice plate 4, the plate 6 shown in FIG. 4 has a rectangular cross-section, with a cross section in the duct has a rectangular cross. 4 consistent orifice plate through-hole 4 formed in the pattern shown in FIG. 6 in FIG. 2 and FIG.

The above embodiments with reference to the accompanying drawings orifice embodiment of the present invention is described. Incidentally, in the embodiment shown in FIGS. 2-3 and 5-6, the through hole 8 is formed around the four circular holes; embodiment illustrated in FIG. 4, the through hole is formed around the arc 4 shaped slot; and divided into two groups in FIG. 5 around the through hole in FIG. 3, around the center of the two through-openings are located on a radius R.hl and R.h2 on the circumference, however, the present invention is not limited thereto, the orifice plate around the through hole 4 may be formed in any suitable number, for example, six, eight, around the center of the through hole may be located respectively on the circumference of a plurality of radii form around the through hole of the orifice plate 4 can be different, for example, a set of vias can be a circular hole, the other group may be arcuate slot and the like. Further, the shape of the orifice plate 4 is not limited to rectangular and circular, cross-sectional shape of the pipe, the shape of the orifice plate 4 may be of any suitable geometry.

13, around the through hole 8A is formed with a beveled surface 4A of each of the orifice plate 4. Of course, the present invention is not limited to this angle may be a right angle 8A.

FIG 14 shows a partial cross-sectional view of the orifice plate in the pipe 4 at which the fluid flow rate through the central circular through-hole 7 is V el, the flow rate of the fluid flowing around the through hole 8 is Vc h, and around each the through-hole 8 is parallel to the longitudinal axis of the longitudinal axis of the conduit.

Thus, according to the present invention, as long as the through-hole on the perforated plate is designed to meet the fluid flowing through them substantially equal to the Reynolds number, e.g., the above-described embodiments satisfy the formula a 1 a 2 and 4 6.

The Reynolds number based on the principle of balance substantially equal, and the position of the through-hole aperture plate may also be obtained by approximate calculation formula. For example, with reference to FIGS. 7-12, the following equation is given:

A R = a / (X R V ^) (7) wherein & equalizing flow region to function from the center of the central circular area. 7A 4C stop, center radius

The total area of ​​the holes on the Rch;

X R is the radius of the flow coefficient on the circumference of Rch, which is equal to (p K) R, wherein & is the density of the fluid flowing in conduit 10 at a radius Rch ^^ flowing through the conduit at a radius Rch

A correlation coefficient of the fluid flow modifier 10, and this hydrodynamic coefficients, kinetic energy, energy density, volume flow rate, the flow rate and the like;

V R is the radius in the velocity of the fluid flowing through a pipe at Rch, where as in the prior art, a particular fluid flow rate based on a follow outflow conduit allocation function known size / shape factors; b. For at least one (and associated fluid flowing through a pipe) at each process variable is equal to the radius Rch or "balanced" constant, where b is an arbitrary value, but generally between -5 to +5 (e.g. b- equilibrium when the flow rate is generally 1 when the power or speed of the head (velocity head) equalizer, although the flow correction coefficient K may be different for each example, generally from 2 B-, etc.), and a is equal to (X R a R at each radius Rch V R b) constant.

Based on the fluid flow rate, the flow coefficient X R as a constant or may be changed due to plate surface. In particular, when the change in the product X R (i.e., (p K) R) is greater than a predetermined different regions of the orifice plate of the upper limit, & coefficient is variable.

In the only example of a process variable to be considered, the constant b is selected so that the process in each of the variable orifice equal to the radius of the circular or equalized values. If more than one process variable to be concerned, the value of b is chosen so that a balanced flow across the orifice region of the process variable (that need to be considered) equalization or equalization to achieve the best results. In order to optimize the process of balancing the need to consider all the variables, absolute equalization single process variables need to be a compromise. As a result, according to the present invention, a plurality of process variable equalization reach some degree of equalization process of equalizing orifice flow across each of the variable region.

The sum of pore area A R is defined differently according to different arrangement of holes, which are arranged generally fall into two different categories. Center of the first type finger hole shaped configuration (e.g. circular, arcuate slot) is located on the radius of the Rch, discretely distributed in the pores balanced flow region 4C. The second category refers to the area of ​​all the hole-shaped structure only in the radial hole of Rch, wherein each aperture extending from the circumference of the central circular through-hole 7 to the circumferential 4D

Irrespective of the distribution of the pore structure, the flow aperture plate 4 provided the total area A T. A ratio of the flow area of the duct tal can be calculated by the following well-known formula,

Q = 2G cP Ap (C 0 YA pipe / M)

Which G. Newton conversion constant

P is the fluid density, pressure Ap different measuring orifice,

C. For the orifice coefficient,

Υ is the coefficient of expansion, generally used compressible fluid, and

Μ is the mass flow.

Equation (8) and (9) from McCabe et al., "Unit operations of chemical engineering, 5th Edition," in the McGraw-Hi ll, Inc., NY, 1983, p. 222 directly derived, the contents of which is by reference.

Using the orifice flow area of the total A T. The total area of td, equalization orifice flow area 4C is

^ TOTAL _ A RO = A R1 + A R2 + ... + A Rn (10) wherein A RQ (i) when the central circular area without holes 7A, is 0, (ii) when a single central radius Rcl the tact when the hole in the center of the circular region 7A, is 2 R c l, (iii) a plurality of holes in the total area of the central circle region 7A. A single central radius of the circular through-hole in the center circle region 7A may be up to (including) Rcl.

7-9 embodiment shown in the center circle region 7A distribution of the first type of hole-shaped structure. These examples do not represent a special case, but in general based on the radius - pore radius arranged embodiment has been described. Each example is based around the through hole 8 is used. Around the same through hole diameter on a particular radius, but satisfying the constraint equation (7) is defined, it need not be identical diameter. Generally satisfying the equation (7), the holes may be of any shape. Center may be calculated by the following equation in a discrete uniform circular opening diameter of a given radius Rch Dch

Dch = 2 (A Rch / N π) 1 2 (11) wherein A Reh all the radial center of the aperture area of Rch,

The number N is preferably located at the center of the aperture radius Rch.

7, around the center of the center through hole on each radius around the through hole and the Rch hole in the other radial alignment. In FIG. 8 around the center of the through hole 8 on each radius with the center around the through hole of Rch in the near radius derangement. Not FIGS. 7 and 8 located around the center near the through hole coincides with a radius. However, FIG. 9, a number of through holes located around the center of the radius of the adjacent overlap.

Another type shown in FIG. 10 is a first discrete hole shaped hole structure embodiment, arc center is located on the slot-like aperture radius Rch. Arc-shaped groove 8 having a bore diameter D of the circular head section (i.e. semicircular) and width D. Because the arc slit opening 8 is located in the center radius Rch, the groove width D is calculated by the following equation

Dch = (-aRch / 90) + {(32400 * A Rch + a 2 R c 2 h ^ S) / (8100 ^ S)} / 1/2 (12) where a = 360 / 2S,

S is the number of slots on a given radius Rch, and

A Rch is centered at the radial groove area of all Rch.

Equidistant or not equidistant slots on a given radius are spaced without departing from the scope of the present invention. The same as the above-mentioned circular holes, the radius of the groove can be aligned on adjacent or derangement. In addition, if satisfies the equation

(7), the groove can be of different shapes and sizes.

As shown in FIGS. 11 and 12 according to the distribution of said second type grooved Example 4C in the equalization of the flow area orifice. Additionally each embodiment, the circular holes extending from the center or near the peripheral region 7A to equalizing flow region. 4C 4D. EXAMPLES To demonstrate the general shape and position of the hole. Increased embodiment, the area of ​​the central circle region followers around the through hole 8 of each radial distance increases 7A embodiment. Sch radians in the radial Rch calculated by the following equation

Sch = {ARch / (2Rch + AR) + A (Rch + 1) + AR)} / 2NAR (13)

Wherein Rch is the change in length to radial Rch + 1

The number N is preferably formed around the through hole 4 in the orifice plate 8.

Without departing from the scope of the present invention, other methods may be used to calculate the angle in radians Sch. 11, a V-shaped aperture 8, the aperture 12 in FIG. 8 as expansion geometric shape.

The above formula (6) - (13) is substantially equal Reynolds number based on the principle of balance, division and calculation of the center circle region and balanced region of the hole flow area, and may be used in at least one process variable associated with the Reynolds number at each radius Rch at equal or "balanced" constant, and to regulate the size and distribution of embodiment a calculated well plate embodiment.

As described above, the present invention may orifice "as is" for simple adjustment of the flow. Further, also with one or more sensors over the complete measuring a process variable orifice plate "measurement instrument." Radial expansion may be formed by drilling holes in the orifice plate, and the measurement instrument with built-in sensors on the via sidewalls. Such measurement hardware in the flow field completely. Note that the measured upstream and downstream of the orifice plate traditional measurement methods may also be used.

Numerous advantages of the present invention. By a variety of methods may be easily manufactured balance (balance flow coverage area) associated with the fluid process variable. Compared with the conventional plate, the advantages of the present invention include improved accuracy, better pressure recovery and low noise generation. Further according to the present invention may also reduce the side plate to the other side of the permanent pressure loss. Thus the present invention is a fluid through the passage than through the prior art plate requires less pumping energy. The present invention can be used in a wide range of fluid flow applications. Although described with reference to the drawings Some embodiments of the present invention, but apparent to those skilled in the without departing from the scope of the claims of the present invention as defined in the claims, that many variations and modifications.

Claims

Claims
A plate, comprising:
A plate adapted to be disposed within the duct cross-section and extending through the conduit, said plate having a plurality of through holes, a plurality of through-holes are formed through each of the through-hole Reynolds number of the fluid substantially equal.
2. A plate as claimed in claim 1, wherein said plurality of through holes comprises:
Central circular through-hole located in the center of the plate; and
A plurality of through holes located around the periphery of the central circular through-hole, said central hole and a plurality of tact around the through hole satisfies the following relationship:
Rcl c l = Rch ch
among them:
Is the radius of the central circular through-hole;
The flow rate of fluid in the conduit at the center of the central circular through-hole;
I is the distance from the plate center to center around the through hole;
Vc h is the fluid within the conduit around the through hole at the center of the fluid flow rate.
3, the orifice plate according to claim 2, wherein around each through hole is beveled at each surface of the plate.
4. The orifice plate according to claim 2, wherein the longitudinal axis of each through hole around the longitudinal axis parallel to the conduit.
5. The orifice plate according to claim 2, wherein each hole is a circular shape around the through hole.
6. The plate according to claim 2, wherein each of the through holes around the grooves are arcuate.
7, the orifice plate as claimed in claim 1, wherein said plate is circular.
8. A plate as claimed in claim 1, wherein said plate is rectangular.
PCT/CN2008/001717 2007-10-15 2008-10-10 A balanced orifice plate WO2009062379A1 (en)

Priority Applications (2)

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CN 200710162844 CN101413626B (en) 2007-10-15 2007-10-15 Balancing plates

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Publication number Priority date Publication date Assignee Title
WO2012034106A1 (en) * 2010-09-09 2012-03-15 William Theo Wells 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

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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
CN201104248Y (en) * 2007-06-01 2008-08-20 上海科洋科技发展有限公司 Aperture plate

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CN101413626A (en) 2009-04-22 application
RU2010116060A (en) 2011-11-20 application
CN101413626B (en) 2011-03-16 grant
RU2451908C2 (en) 2012-05-27 grant

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