CN212158701U - Uniform speed plate and flow meter - Google Patents
Uniform speed plate and flow meter Download PDFInfo
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- CN212158701U CN212158701U CN202020771697.3U CN202020771697U CN212158701U CN 212158701 U CN212158701 U CN 212158701U CN 202020771697 U CN202020771697 U CN 202020771697U CN 212158701 U CN212158701 U CN 212158701U
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Abstract
The utility model relates to an even fast board and flowmeter, include: the speed equalizing plate is inserted into the pipeline and is provided with a first through hole arranged along the central axis of the speed equalizing plate and a plurality of second through holes arranged at intervals in the circumferential direction around the first through hole; the pressure taking hole groups are arranged on the uniform speed plate and are arranged at intervals with the second through holes; and the pressure taking pipe group is communicated with the pressure taking hole groups. By adopting the multi-through hole structure design, the influence of mutual interference between the fluids flowing through the pressure taking holes is minimum, so that the accurate measurement of dynamic and static pressures in the pipeline is ensured, and the measurement accuracy of the fluid flow in the pipeline is greatly improved.
Description
Technical Field
The utility model belongs to the technical field of flow measurement, detection, concretely relates to uniform velocity plate and flowmeter.
Background
Differential pressure flowmeters have a long history and are most widely used in various flow meters. The flow rate is obtained by measuring the differential pressure generated by the fluid in the pipeline flowing through the throttling element and combining the known working condition conditions by taking a Bernoulli equation and a flow continuity equation as basic principles.
The existing differential pressure type flow meters can be generally divided into two categories according to the structure: throttling methods and dynamic and static pressure methods. The throttling method has the advantages that through changing the beta value, ideal differential pressure can be obtained, so that different measurement requirements are met, the structure is reliable, the maintenance is easy, and the pressure loss is high; the dynamic and static pressure method is mainly plug-in type, a plurality of dynamic pressure holes and static pressure holes are arranged in front of and behind a specific pipe bundle to obtain differential pressure, all the dynamic pressure holes (static pressure holes) are communicated, the average flow speed is converted from multipoint flow speed measurement, and the result is more ideal compared with a single-point mode. But the low differential pressure generated by the device is small, and the wide-range requirement cannot be met.
SUMMERY OF THE UTILITY MODEL
In order to solve part or all of the problems, the utility model provides a uniform velocity plate and a flowmeter, which adopt a multi-through hole structure design, so that the flowing states of fluid flowing through a first through hole and a second through hole are similar, and on one hand, the purpose of balanced throttling is achieved; on the other hand, the accuracy of fluid pressure measurement through the pressure measurement hole group is ensured, the measurement accuracy of fluid flow in the pipeline is greatly improved, the requirements of front and rear straight pipe sections are reduced, and the device is suitable for wider measurement occasions.
The utility model provides a uniform speed board, include: the uniform speed plate is inserted into the pipeline and is provided with a first through hole arranged along the central axis of the uniform speed plate and a plurality of second through holes arranged at intervals in the circumferential direction around the first through hole; the pressure taking hole groups are arranged on the uniform speed plate and are arranged at intervals with the second through holes; the pressure taking pipe group is communicated with the pressure taking hole groups; and the differential pressure gauge is connected with the pressure taking pipe group and is used for acquiring the dynamic and static pressure difference of the uniform velocity plate.
Further, the pressure tapping hole group comprises a dynamic pressure tapping hole group which is opened towards the upstream of the uniform speed plate main body and a static pressure tapping hole group which is opened towards the downstream of the uniform speed plate main body.
Further, the pressure tapping pipe group comprises a dynamic pressure pipe communicated with a plurality of dynamic pressure tapping hole groups and a static pressure pipe communicated with a plurality of static pressure tapping hole groups.
Further, the dynamic pressure tapping hole group comprises a plurality of dynamic pressure tapping holes which are arranged at intervals along a direction perpendicular to the central axis of the speed equalizing plate main body; the static pressure tapping hole group comprises a plurality of static pressure tapping holes which are arranged at intervals along the direction vertical to the central axis of the uniform speed plate main body.
Further, the static pressure tapping holes of the plurality of static pressure tapping hole groups are respectively positioned on a plurality of concentric circles coaxial with the first through hole along the direction far away from the central axis of the uniform speed plate main body; the dynamic pressure tapping hole and the static pressure tapping hole are symmetrically arranged and are axially parallel.
Further, the dynamic pressure pipe comprises a plurality of dynamic pressure straight pipes which are respectively communicated with each group of dynamic pressure tapping holes and extend outwards along the direction vertical to the central axis of the uniform speed plate main body, and a dynamic pressure ring pipe which is communicated with the plurality of dynamic pressure straight pipes and is arranged around the uniform speed plate main body;
the static pressure pipe comprises a plurality of static pressure straight pipes and a static pressure ring pipe, wherein the static pressure straight pipes are respectively communicated with each group of static pressure taking holes and extend outwards along the direction perpendicular to the central axis of the speed equalizing plate main body, and the static pressure ring pipe is communicated with the static pressure straight pipes and surrounds the speed equalizing plate main body.
Further, the dynamic pressure pipe also comprises a first communicating pipe communicated with the dynamic pressure ring pipe; the static pressure pipe also comprises a second communicating pipe communicated with the static pressure ring pipe.
And the static pressure cavity is used for communicating each group of static pressure straight pipes and each group of static pressure tapping hole groups.
Further, the first through hole and the second through hole are axially parallel round through holes; the inlets of the first through hole and the second through hole are right angles or arc angles; the Reynolds numbers of the fluid flowing through the first through hole and the second through hole are equal.
The utility model also provides a flowmeter, including above-mentioned board of equalling speed, still include with the differential pressure gauge that the pressure tapping group links to each other is used for acquireing the dynamic and static pressure difference of board of equalling speed.
The utility model discloses an even speed board, through designing the central axis extension of first through-hole along even speed board, the second through-hole is arranged around the circumference interval of first through-hole, the structural design in many through-holes is so that under same flow area condition, under the same hole number, the aperture of first through-hole, the aperture of second through-hole and get the interval between the pressure hole and optimize to make central shrink and circumferential weld shrink obtain the balance, it is minimum to flow through the influence of each mutual interference between the fluid of pressure hole promptly. The flow states of the fluid flowing through the first through hole and the second through hole are similar, so that the fluctuation of the fluid flowing through the uniform speed plate in the pipeline is greatly reduced, and the aim of balanced throttling is fulfilled; on the other hand, the accuracy of the pressure tapping hole group arranged between the adjacent second through holes for fluid pressure tapping is ensured, the measurement accuracy of the fluid flow in the pipeline is greatly improved, the requirements of the front straight pipe section and the rear straight pipe section are reduced, and the method is suitable for wider measurement occasions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic view of an assembly structure of a uniform speed plate in a pipeline according to an embodiment of the present invention;
fig. 2 is a schematic view of a three-dimensional structure of the uniform speed plate shown in the embodiment of the present invention:
fig. 3 is a side view of the speed equalizing plate according to the embodiment of the present invention:
FIG. 4 is a schematic cross-sectional view taken along the line E-E in FIG. 3;
fig. 5 is a schematic sectional view along the direction B-B shown in fig. 3.
Description of reference numerals: the pressure equalizing plate comprises a pressure equalizing plate 001, a pressure equalizing plate body 1, a first through hole 101, a second through hole 102, a pressure tapping hole group 103, a dynamic pressure tapping hole group 131, a static pressure tapping hole group 132, a pressure tapping pipe group 2, a dynamic pressure pipe 201, a dynamic pressure straight pipe 211, a dynamic pressure ring pipe 212, a first communication pipe 213, a dynamic pressure cavity 214, a static pressure pipe 202, a static pressure straight pipe 221, a static pressure ring pipe 222, a second communication pipe 223, a static pressure cavity 224, an upstream A1, a downstream A2, a fluid flow X, a flange 002 and a pipeline 003.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 to 5, the present embodiment provides a uniform velocity plate 001, including: the uniform-speed plate main body 1 is inserted into the pipeline 003 and is provided with a first through hole 101 arranged along the central axis thereof and a plurality of second through holes 102 arranged at intervals in the circumferential direction around the first through hole 101; a plurality of pressure tapping hole groups 103 which are arranged on the uniform speed plate main body 1 and are arranged at intervals with the plurality of second through holes 102; a pressure taking tube group 2 communicating with the plurality of pressure taking hole groups 103; and the differential pressure gauge is connected with the pressure taking pipe group 2 and is used for acquiring the dynamic and static pressure difference of the uniform velocity plate main body 1.
Referring to fig. 1, the field application flange 002 of the uniform velocity plate 001 of the present embodiment is directly installed in the pipeline 003 in a clamping manner, by designing that the first through hole 101 of the uniform velocity plate main body 1 extends along the central axis of the uniform velocity plate main body 1, and the second through holes 102 are arranged around the first through hole 101 at intervals in the circumferential direction, it is further ensured that the flow states of the fluid flowing through the first through hole 101 and the second through hole 102 are similar, which is beneficial to greatly reducing the fluctuation of the fluid flowing through the uniform velocity plate main body 1 in the pipeline 003, and on the one hand, the purpose of balanced throttling is achieved; on the other hand, the accuracy of fluid pressure measurement of the pressure measurement hole group 103 arranged between the adjacent second through holes 102 is ensured, the measurement accuracy of fluid flow in the pipeline 003 is greatly improved, and the requirements of front and rear straight pipe sections are reduced, so that the method is suitable for wider measurement occasions.
The speed equalizing plate main body 1 of the embodiment adopts a porous design, so that the length of a straight pipe section is obviously shortened, and the flow field shape, the flow velocity distribution and the like of the speed equalizing plate main body have certain characteristics.
In a preferred embodiment, the reynolds numbers of the fluid flowing through the first through hole 101 and the second through hole 102 are equal, so that the reynolds numbers are balanced, and the hole diameter of the first through hole, the hole diameter of the second through hole and the interval between the pressure taking holes are optimized under the condition of the same flow area and the same hole number, so that the central contraction and the circumferential contraction are balanced, namely, the influence of mutual interference between the fluids flowing through the pressure taking holes is minimized. In the embodiment, the factors of energy balance, smooth balance and Reynolds number balance are effectively considered.
Wherein the energy balance is based on static energy, entropy balance and Gibbs equation
According to an isentropic process
-TdS + LW + Q ═ 0 and
wherein H, S, Q, W is the enthalpy, entropy, internal energy and work of the fluid, respectively; p, ρ and T are the pressure, density and thermodynamic temperature of the fluid, respectively; g is the local weight acceleration; gcIs the Newton transformation coefficient; LW is the work loss; m is the molar mass; and a is a kinetic energy correction coefficient.
In the present embodiment, the velocity equalizing plate is provided with a first through hole 101 and a plurality of second through holes 102, and reynolds numbers of fluid flowing through each hole are equal to balance the reynolds numbers, and the reynolds numbers satisfy the following relationship:
Rc1Vc1＝RchVch：
wherein R isc1Is the radius of the first through hole 101; vc1Is the flow velocity of the fluid in the pipe 003 at the center of the first through hole 101; rchIs the distance from the center of the uniform velocity plate main body 1 to the center of the surrounding second through hole 102; vchIs the fluid flow rate of the fluid in the conduit 003 at the center of the second through hole 102.
The first through hole 101 and the second through hole 102 in the present embodiment are parallel in the axial direction; the flow conditions and the flow velocity distribution of the fluid flowing through the first through-hole 101 and the second through-hole 102 can be made as equal as possible.
In this embodiment, the cross-sectional shapes of the first through hole 101 and the second through hole 102 may be circular, triangular or polygonal, and in a preferred embodiment, the first through hole 101 and the second through hole 102 are both circular through holes; the inlets of the first through hole 101 and the second through hole 102 are right angles or arc angles, when the inlets of the first through hole 101 and the second through hole 102 are right angles, the fluid pressure is rapidly increased when the fluid flows through the inlets of the first through hole 101 and the second through hole 102, and when the inlets of the first through hole 101 and the second through hole 102 are arc angles, the fluid pressure is relatively slowly increased when the fluid flows through the inlets of the first through hole 101 and the second through hole 102.
Referring to fig. 3 to 5, in the case of the uniform velocity plate 001 according to the present embodiment, the pressure taking hole group 103 includes a dynamic pressure taking hole group 131 opening toward the upstream a1 of the uniform velocity plate body 1 and a static pressure taking hole group 132 opening toward the downstream a2 of the uniform velocity plate body 1, and the flow direction of the fluid in fig. 3 is X. And the pressure tapping holes of the dynamic pressure tapping hole group 131 and the static pressure tapping hole group 132 are coaxially designed, so that the measured pressure difference data is more reliable.
Referring to fig. 2 to 5, the pressure taking tube group 2 in the present embodiment includes a dynamic pressure tube 201 communicating with a plurality of dynamic pressure taking hole groups 131 and a static pressure tube 202 communicating with a plurality of static pressure taking hole groups 132. The dynamic pressure pipe 201 can transmit dynamic pressure obtained by the dynamic pressure obtaining hole to the flowmeter, and the static pressure pipe 202 can transmit static pressure obtained by the static pressure obtaining hole to the flowmeter, so that the flowmeter can display dynamic and static pressure difference of fluid in the pipeline 003.
In the velocity-equalizing plate 001 of the present embodiment, the dynamic pressure tapping hole group 131 includes a plurality of dynamic pressure tapping holes arranged at intervals in a direction perpendicular to the central axis of the velocity-equalizing plate body 1; the hydrostatic pressure tapping hole group 132 includes a plurality of hydrostatic pressure tapping holes arranged at intervals in a direction perpendicular to the center axis of the uniform velocity plate main body 1. By designing the dynamic pressure tapping hole group 131 to include a plurality of dynamic pressure tapping holes, the number of fluid pressure tapping points between adjacent second through holes 102 is increased, which is beneficial to ensuring the measurement accuracy of the fluid dynamic pressure at the position; by designing the hydrostatic pressure tapping hole group 132 to include a plurality of hydrostatic pressure tapping holes, the number of fluid pressure tapping points between adjacent second through holes 102 is increased, which is beneficial to ensuring the accuracy of measuring the hydrostatic pressure at the position.
Referring to fig. 4 and 5, in a preferred embodiment, the dynamic and static pressure holes are distributed according to an equal torus method, the cross section of the uniform velocity plate main body 1 with the radius R is divided into n concentric rings (the center is a circle) with equal areas, and dynamic and static pressure hole detection points are arranged on each ring with equal area, so that the data of each group of dynamic and static pressure hole detection points can more truly reflect the flow velocity of the pipeline 003.
In this embodiment, the dynamic pressure tube 201 of the velocity-equalizing plate 001 includes a plurality of dynamic pressure straight tubes 211 respectively communicated with each set of dynamic pressure tapping holes and extending outward in a direction perpendicular to the central axis of the velocity-equalizing plate body 1, and a dynamic pressure annular tube 212 communicated with the plurality of dynamic pressure straight tubes 211 and disposed around the velocity-equalizing plate body 1; the static pressure pipe 202 comprises a plurality of static pressure straight pipes 221 which are respectively communicated with each group of static pressure taking holes and extend outwards along the direction vertical to the central axis of the speed equalizing plate body 1, and a static pressure ring pipe 222 which is communicated with the static pressure straight pipes 221 and is arranged around the speed equalizing plate body 1. In this embodiment, all dynamic pressure holes on the uniform velocity plate main body 1 are communicated in a manner of matching the dynamic pressure straight tube 211 and the dynamic pressure ring tube 212 to obtain an average value of a plurality of dynamic pressure detection points on the upstream of the uniform velocity, all static pressure holes on the uniform velocity plate main body 1 are communicated in a manner of matching the static pressure straight tube 221 and the static pressure ring tube 222 to obtain an average value of a plurality of static pressure detection points on the downstream of the uniform velocity, and then a relatively accurate dynamic and static pressure difference value can be obtained, so that the fluctuation of signals can be effectively reduced, and the measurement accuracy can be improved.
In the present embodiment, the dynamic pressure pipe 201 further includes a first communication pipe 213 communicating with the dynamic pressure collar pipe 212 and for connecting a differential pressure gauge; static tube 202 also includes a second communication tube 223 in communication with static collar 222 for connection to a differential pressure gauge. The obtained dynamic pressure average value is transmitted to the differential pressure gauge through the first communication pipe 213, and the obtained static pressure average value is transmitted to the differential pressure gauge through the second communication pipe 223, thereby obtaining the effective differential pressure of the uniform velocity plate main body 1.
The velocity equalizing plate 001 in the present embodiment further includes a dynamic pressure cavity 214 provided in the velocity equalizing plate body 1 and communicating each set of dynamic pressure straight pipes 211 with the dynamic pressure tapping hole group 131, and a static pressure cavity 224 communicating each set of static pressure straight pipes 221 with the static pressure tapping hole group 132. The structural design of the dynamic pressure cavity 214 can obtain the average value of the dynamic pressure detected by each group of dynamic pressure tapping hole groups 131, and the structural design of the static pressure cavity 224 can obtain the average value of the static pressure detected by each group of static pressure tapping hole groups 132, so that the measurement accuracy is improved.
The present embodiment further includes a flow meter, which includes the velocity-equalizing plate in any of the above embodiments, and further includes a differential pressure meter connected to the pressure tapping hole set, and is configured to obtain a dynamic-static pressure difference of the velocity-equalizing plate. In a specific embodiment, a differential pressure gauge is connected with the first communicating pipe and the second communicating pipe and used for acquiring the dynamic and static pressure difference of the uniform velocity plate.
The uniform velocity plate and the flowmeter in the embodiment have the advantages that through professional structural design, the balance throttling principle and the equal Reynolds number algorithm are utilized, the measurement accuracy is greatly improved, the requirements of front and rear straight pipe sections and the pressure loss are reduced, the uniform velocity plate and the flowmeter are suitable for wider measurement occasions, and the uniform velocity plate and the flowmeter have wide application prospects.
In the description of the present application, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.
Claims (10)
1. A speed equalizer plate, comprising:
the speed equalizing plate main body is inserted into the pipeline and is provided with a first through hole arranged along the central axis of the pipeline and a plurality of second through holes arranged at intervals in the circumferential direction around the first through hole;
the pressure taking hole groups are arranged on the speed equalizing plate main body and are arranged at intervals with the second through holes;
and the pressure taking pipe group is communicated with the pressure taking hole groups.
2. The equalizer plate of claim 1, wherein the set of pressure taps comprises a set of dynamic pressure taps opening to an upstream side of the equalizer plate body and a set of static pressure taps opening to a downstream side of the equalizer plate body.
3. The velocity equalizing plate according to claim 2, wherein the pressure tapping tube set comprises a dynamic pressure tube in communication with a plurality of the dynamic pressure tapping hole sets and a static pressure tube in communication with a plurality of the static pressure tapping hole sets.
4. The velocity equalizing plate according to claim 3, wherein the dynamic pressure tapping hole group comprises a plurality of dynamic pressure tapping holes arranged at intervals in a direction perpendicular to a central axis of the velocity equalizing plate body; the static pressure tapping hole group comprises a plurality of static pressure tapping holes which are arranged at intervals along the direction vertical to the central axis of the uniform speed plate main body.
5. The velocity equalizing plate according to claim 4, wherein the hydrostatic taps of the plurality of groups of hydrostatic taps are located on a plurality of concentric circles coaxial with the first through-hole, respectively, in a direction away from a central axis of the velocity equalizing plate body; the dynamic pressure tapping hole and the static pressure tapping hole are symmetrically arranged and are axially parallel.
6. The velocity equalizing plate according to claim 4, wherein the dynamic pressure tubes comprise a plurality of dynamic pressure straight tubes which are respectively communicated with each set of dynamic pressure tapping holes and extend outwards in a direction perpendicular to the central axis of the velocity equalizing plate body, and dynamic pressure annular tubes which are communicated with the plurality of dynamic pressure straight tubes and are arranged around the velocity equalizing plate body;
the static pressure pipe comprises a plurality of static pressure straight pipes and a static pressure ring pipe, wherein the static pressure straight pipes are respectively communicated with each group of static pressure taking holes and extend outwards along the direction perpendicular to the central axis of the speed equalizing plate main body, and the static pressure ring pipe is communicated with the static pressure straight pipes and surrounds the speed equalizing plate main body.
7. The velocity equalizing plate according to claim 6, wherein the dynamic pressure tube further comprises a first communicating tube communicating with the dynamic pressure collar; the static pressure pipe also comprises a second communicating pipe communicated with the static pressure ring pipe.
8. The velocity equalizing plate according to claim 6, further comprising a dynamic pressure cavity disposed in the velocity equalizing plate body and communicating each set of the dynamic pressure straight pipes and the dynamic pressure tapping hole sets, and a static pressure cavity communicating each set of the static pressure straight pipes and the static pressure tapping hole sets.
9. The velocity equalizing plate according to claim 1, wherein the first through-hole and the second through-hole have axially parallel round through-holes; the inlets of the first through hole and the second through hole are right angles or arc angles; the Reynolds numbers of the fluid flowing through the first through hole and the second through hole are equal.
10. A flowmeter comprising the velocity-equalizing plate of any one of claims 1-9, further comprising a differential pressure gauge connected to the pressure-tapping hole set for obtaining a dynamic-static pressure difference of the velocity-equalizing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020771697.3U CN212158701U (en) | 2020-05-11 | 2020-05-11 | Uniform speed plate and flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020771697.3U CN212158701U (en) | 2020-05-11 | 2020-05-11 | Uniform speed plate and flow meter |
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| Publication Number | Publication Date |
|---|---|
| CN212158701U true CN212158701U (en) | 2020-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020771697.3U Active CN212158701U (en) | 2020-05-11 | 2020-05-11 | Uniform speed plate and flow meter |
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|---|---|
| CN (1) | CN212158701U (en) |
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2020
- 2020-05-11 CN CN202020771697.3U patent/CN212158701U/en active Active
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