CN112284478A - Auxiliary device for flow measurement - Google Patents
Auxiliary device for flow measurement Download PDFInfo
- Publication number
- CN112284478A CN112284478A CN202011172259.6A CN202011172259A CN112284478A CN 112284478 A CN112284478 A CN 112284478A CN 202011172259 A CN202011172259 A CN 202011172259A CN 112284478 A CN112284478 A CN 112284478A
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- flow measurement
- drainage tube
- flow
- assistance device
- outlet
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- 238000005259 measurement Methods 0.000 title claims abstract description 82
- 230000003068 static effect Effects 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 210000001503 joint Anatomy 0.000 abstract description 3
- 238000009530 blood pressure measurement Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 8
- 238000009529 body temperature measurement Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/18—Supports or connecting means for meters
- G01F15/185—Connecting means, e.g. bypass conduits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/005—Valves
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The application belongs to the technical field of flow measurement, concretely relates to flow measurement auxiliary device includes: a drainage tube having a measuring hole thereon; the flow measurement auxiliary device can be used for assisting in measuring the airflow in the pipeline, when the flow measurement auxiliary device is used for assisting in measuring the airflow in the pipeline, the inlet of the drainage pipe is arranged to be in butt joint with the outlet of the pipeline so that the airflow in the pipeline can flow into the drainage pipe, the corresponding total temperature, total pressure and static pressure measuring devices are connected to the measuring holes, the total temperature, total pressure and static pressure of the airflow flowing through the drainage pipe are measured, and the airflow in the pipeline is obtained through calculation based on the total temperature, total pressure and static pressure obtained through measurement.
Description
Technical Field
The application belongs to the technical field of flow measurement, concretely relates to auxiliary flow measurement device.
Background
Currently, the measurement of the airflow in the pipeline is mostly based on the measurement of total temperature, total pressure and static pressure in the pipeline, and is obtained through formula calculation.
The present application is made in view of the above-mentioned technical drawbacks.
It should be noted that the above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and the above background disclosure should not be used for evaluating the novelty and inventive step of the present application without explicit evidence to suggest that the above content is already disclosed at the filing date of the present patent application.
Disclosure of Invention
It is an object of the present application to provide a flow measurement assistance device to overcome or mitigate at least one of the technical deficiencies of the known prior art.
The technical scheme of the application is as follows:
a flow measurement assistance device comprising:
a drainage tube having a measuring hole thereon;
and the inlet honeycomb is arranged in the drainage tube and is positioned between the inlet of the drainage tube and the measuring hole.
According to at least one embodiment of the present application, in the auxiliary flow measurement device, a plurality of measurement holes are distributed along the circumferential direction, and include a total pressure measurement hole, a total temperature measurement hole, and a static pressure measurement hole.
According to at least one embodiment of the present application, in the flow measurement auxiliary device, the diameter of the drainage tube is D;
the distance between the inlet of the drainage tube and the inlet honeycomb is L1; l1 ═ 0.25-0.4D.
According to at least one embodiment of the present application, in the flow measurement auxiliary device, the lattice of the inlet honeycomb is a regular hexagon, and the distance between the opposite sides is M;
the inlet cell has a length of L2; L2/M is not less than 10.
According to at least one embodiment of the present application, in the auxiliary flow measurement device, a wire mesh is disposed in the drainage tube and between the inlet honeycomb and the measurement hole.
According to at least one embodiment of the present application, in the flow measurement auxiliary device, the diameter of the drainage tube is D;
the distance between the screen and the measuring hole is L3; L3/D is not less than 0.5.
According to at least one embodiment of the present application, in the flow measurement auxiliary device, the mesh has a hole number of 18 meshes/inch or more.
According to at least one embodiment of the present application, in the flow measurement auxiliary device, the mesh diameter of the mesh is d, and the distance between the mesh and the mesh is c;
the opening rate of the screen is s; s ═ 1-d/c)2；s≥0.6。
According to at least one embodiment of the present application, the flow measurement assisting apparatus further includes:
the two baffle rings are internally provided with criss-cross ribs and are arranged in the drainage tube, and the outer edges of the two baffle rings are connected with the inner wall of the drainage tube and distributed on the two sides of the silk screen to clamp the silk screen.
According to at least one embodiment of the present application, in the flow measurement auxiliary device, there are two sets of the wire mesh and the baffle rings corresponding to the wire mesh.
According to at least one embodiment of the present application, in the flow measurement auxiliary device, the meshes on the two screens are distributed in a staggered manner.
According to at least one embodiment of the present application, in the auxiliary flow measurement device, a distance between two wires on the wire mesh is c;
the distance between the two wire meshes is L4; l4 ═ 25-35 c.
According to at least one embodiment of the present application, the flow measurement assisting apparatus further includes:
and the flow regulating valve is arranged at the outlet of the drainage tube.
According to at least one embodiment of the present application, the flow measurement assisting apparatus further includes:
and the outlet honeycomb is arranged in the drainage tube and is positioned between the outlet of the drainage tube and the measuring hole.
According to at least one embodiment of the present application, in the flow measurement auxiliary device, the diameter of the drainage tube is D;
the distance between the measuring hole and the outlet honeycomb is L5; L5/D is not less than 1.
According to at least one embodiment of the present application, the flow measurement assisting apparatus further includes:
the outlet of the adapter tube is butted with the drainage tube.
According to at least one embodiment of the present application, in the auxiliary flow measurement device, the hydraulic radius of the inlet of the adapter tube is R1, and the hydraulic radius of the outlet of the adapter tube is R2;
the length of the adapter tube is L6;
according to at least one embodiment of the present application, in the auxiliary flow measurement device, a cross-sectional area of the outlet of the adapter tube is 2 times a cross-sectional area of the inlet.
Drawings
FIG. 1 is a schematic view of an auxiliary flow measurement device provided in an embodiment of the present application;
FIG. 2 is a schematic view of a section of a measuring hole of a drainage tube provided in an embodiment of the present application;
FIG. 3 is a partial schematic view of a screen provided in an embodiment of the present application;
FIG. 4 is a schematic view of a retainer ring provided in accordance with an embodiment of the present application;
FIG. 5 is a schematic view of an adapter tube provided in an embodiment of the present application;
FIG. 6 is a schematic view of a flow measurement assistance device provided in an embodiment of the present application in cooperation with an intermediary casing test piece bypass;
wherein:
1-a drainage tube; 2-inlet honeycomb; 3-a silk screen; 4-a baffle ring; 5-flow regulating valve; 6-outlet honeycomb; 7-a transfer tube;
a-total pressure measuring hole;
b-total temperature measuring hole;
c-static pressure measuring holes;
e-main flow channel of the intermediary case test piece;
f, an external culvert flow channel of the intermediate casing test piece;
g-inner channel of the intermediate casing test piece;
d-the mesh diameter of the mesh;
c-the mesh spacing of the mesh;
r1 — hydraulic radius of transition tube inlet;
r2 — hydraulic radius of the transition tube outlet;
l1-distance between draft tube entrance, entrance honeycomb;
l2-length of inlet cell;
l3-screen, measure distance between holes;
l4 — distance between two meshes;
l5-measuring the distance between the holes and the outlet cells;
l6-patch tube length;
l7-distance between wire mesh and inlet honeycomb.
For the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; further, the drawings are for illustrative purposes, and terms describing positional relationships are limited to illustrative illustrations only and are not to be construed as limiting the patent.
Detailed Description
In order to make the technical solutions and advantages of the present application clearer, the technical solutions of the present application will be further clearly and completely described in the following detailed description with reference to the accompanying drawings, and it should be understood that the specific embodiments described herein are only some of the embodiments of the present application, and are only used for explaining the present application, but not limiting the present application. It should be noted that, for convenience of description, only the parts related to the present application are shown in the drawings, other related parts may refer to general designs, and the embodiments and technical features in the embodiments in the present application may be combined with each other to obtain a new embodiment without conflict.
In addition, unless otherwise defined, technical or scientific terms used in the description of the present application shall have the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer", and the like used in the description of the present application, which indicate orientations, are used only to indicate relative directions or positional relationships, and do not imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and when the absolute position of the object to be described is changed, the relative positional relationships may be changed accordingly, and thus, should not be construed as limiting the present application. The use of "first," "second," "third," and the like in the description of the present application is for descriptive purposes only to distinguish between different components and is not to be construed as indicating or implying relative importance. The use of the terms "a," "an," or "the" and similar referents in the context of describing the application is not to be construed as an absolute limitation on the number, but rather as the presence of at least one. The use of the terms "comprising" or "including" and the like in the description of the present application is intended to indicate that the element or item preceding the term covers the element or item listed after the term and its equivalents, without excluding other elements or items.
Further, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are used in the description of the invention in a generic sense, e.g., connected as either a fixed connection or a removable connection or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected through the inside of two elements, and those skilled in the art can understand their specific meaning in this application according to the specific situation.
The present application is described in further detail below with reference to fig. 1 to 6.
A flow measurement assistance device comprising:
a drainage tube 1 with a measuring hole thereon;
an inlet honeycomb 2 is arranged in the drainage tube 1 and is positioned between the inlet of the drainage tube 1 and the measuring hole.
For the auxiliary flow measurement device disclosed in the above embodiment, it can be understood by those skilled in the art that the auxiliary flow measurement device can be used to assist in measuring the flow rate of the airflow in the pipeline, when the auxiliary flow measurement device is used to assist in measuring the flow rate of the airflow in the pipeline, an inlet of the drainage tube 1 is arranged to be in butt joint with an outlet of the pipeline, so that the airflow in the pipeline can flow into the drainage tube 1, a corresponding total temperature, total pressure and static pressure measurement device is connected to the measurement hole, the total temperature, total pressure and static pressure of the airflow flowing through the drainage tube 1 are measured, and the flow rate of the airflow in the pipeline is obtained through calculation based on the total temperature.
For the auxiliary flow measurement device disclosed in the above embodiment, it can be further understood by those skilled in the art that when the auxiliary flow measurement device is used for assisting in measuring the flow rate of the airflow in the pipeline, the inlet of the drainage tube 1 is connected to the outlet of the pipeline, the airflow in the pipeline flows into the drainage tube 1, when the airflow passes through the inlet honeycomb 2, the large-scale vortex in the airflow is divided into small-scale vortices, so that the attenuation of the vortices in the airflow is accelerated, when the airflow flows to the cross section where the measurement hole is located, the airflow velocity distribution becomes uniform, the measurement of the total temperature, the total pressure and the static pressure of the airflow has higher accuracy, and the flow rate of the airflow in the pipeline is more accurate through calculation based on the total temperature, the total pressure and the static pressure.
In some optional embodiments, in the flow measurement auxiliary device, a plurality of measurement holes are distributed along the circumferential direction, and include a total pressure measurement hole a, a total temperature measurement hole B, and a static pressure measurement hole C.
With respect to the auxiliary flow measurement device disclosed in the above embodiment, it can be understood by those skilled in the art that a total pressure pipe may be disposed in the total pressure measurement hole a to be able to measure the total pressure of the air flow at the position in the drainage pipe 1; a total temperature pipe can be arranged in the total temperature measuring hole B to measure the total temperature of the airflow at the position in the drainage pipe 1; the static pressure air-entraining pipe can be connected into the static pressure measuring hole C so as to measure the static pressure of the airflow at the position in the drainage pipe 1.
For the auxiliary flow measurement device disclosed in the above embodiment, it can be further understood by those skilled in the art that the number and the distribution positions of the total pressure measurement holes a, the total temperature measurement holes B, and the static pressure measurement holes C may be set by the relevant technical personnel according to the specific practice when the application is applied, for example, the total pressure measurement holes may be 2, the total temperature measurement holes B may be 1, and the static pressure measurement holes C may be 8, and are arranged in an iso-torus shape.
In some optional embodiments, in the auxiliary flow measurement device, the diameter of the drainage tube 1 is D;
the distance between the inlet of the drainage tube 1 and the inlet honeycomb 2 is L1; l1 ═ 0.25-0.4D.
In some alternative embodiments, in the flow measurement auxiliary device, the lattice of the inlet honeycomb 2 is a regular hexagon, and the distance between the opposite sides is M;
the length of the inlet cell 2 is L2; L2/M is more than or equal to 10, so that the segmentation effect on the large-scale vortex in the airflow is ensured, and the attenuation of the vortex in the airflow is accelerated.
In some optional embodiments, in the flow measurement auxiliary device, the wire mesh 3 is disposed in the drainage tube 1 and located between the inlet honeycomb 2 and the measurement hole to further divide the vortex in the air flow and straighten the air flow, so as to ensure that the velocity distribution is uniform when the air flow flows to the cross section where the measurement hole is located.
In some optional embodiments, in the auxiliary flow measurement device, the diameter of the drainage tube 1 is D;
the distance between the screen 3 and the measuring hole is L3; L3/D is not less than 0.5.
In some optional embodiments, in the flow measurement auxiliary device, the mesh 3 has more than 18 meshes/inch.
In some optional embodiments, in the flow measurement auxiliary device, the wire mesh 3 has a wire mesh diameter d and a wire mesh spacing c;
the opening ratio of the screen 3 is s; s ═ 1-d/c)2；s≥0.6。
In some alternative embodiments, in the flow measurement auxiliary device, the distance between the wire mesh 3 and the inlet honeycomb 2 is L7; l7 ═ 0.125D.
In some optional embodiments, the flow measurement auxiliary device further includes:
two baffle rings 4 are provided with criss-cross ribs inside and are arranged in the drainage tube 1, the outer edges of the baffle rings are connected with the inner wall of the drainage tube 1 and distributed at two sides of the silk screen 3 to clamp the silk screen 3.
For the auxiliary flow measurement device disclosed in the above embodiment, as can be understood by those skilled in the art, two baffle rings 4 are disposed corresponding to the wire mesh 3, on one hand, the position of the wire mesh 3 in the drainage tube 1 can be fixed, and on the other hand, the criss-cross ribs on the baffle rings 4 can effectively maintain the shape of the wire mesh 3, thereby avoiding the wire mesh 3 from being impacted by airflow and seriously deformed locally.
With regard to the auxiliary flow measurement device disclosed in the above-mentioned embodiment, it can be further understood by those skilled in the art that, in order to better prevent the silk screen 3 from being seriously deformed locally due to the impact of the air flow, coarse meshes may be disposed on two sides of the silk screen 3 to clamp the silk screen 3.
In some alternative embodiments, in the flow measurement auxiliary device, there are two sets of the wire nets 3 and the retaining rings 4 corresponding to the wire nets, that is, in each set, one wire net 3 corresponds to two retaining rings 4 and is disposed in the drainage tube 1.
In some alternative embodiments, in the flow measurement auxiliary device, the meshes of the two screens 3 are distributed in a staggered manner, specifically at 45 °.
In some alternative embodiments, in the flow measurement auxiliary device, the distance between the two wire meshes 3 is L4; l4 is 25-35 times the mesh width, and specifically may be 30 times the mesh width.
In some optional embodiments, the flow measurement auxiliary device further includes:
and the flow regulating valve 5 is arranged at the outlet of the drainage tube 1.
In some optional embodiments, the flow measurement auxiliary device further includes:
and the outlet honeycomb 6 is arranged in the drainage tube 1 and positioned between the outlet of the drainage tube 1 and the measuring hole so as to reduce the influence of the flow regulating valve 5 on the speed distribution of the cross section of the air flow at the measuring hole.
In some optional embodiments, in the auxiliary flow measurement device, the diameter of the drainage tube 1 is D;
the distance between the measuring hole and the outlet cell 6 is L5; L5/D is not less than 1.
In some optional embodiments, the flow measurement auxiliary device further includes:
the outlet of the adapter tube 7 is butted with the drainage tube 1, and the inlet shape of the adapter tube can be designed according to the outlet shape of the pipeline so as to be butted with the outlet of the pipeline and introduce the air flow in the pipeline into the drainage tube 1.
In some optional embodiments, in the flow measurement auxiliary device, the hydraulic radius of the inlet of the adapter tube 7 is R1, and the hydraulic radius of the outlet of the adapter tube is R2;
the length of the adapter tube 7 is L6;
to avoid separation of the gas streams.
According to at least one embodiment of the present application, in the auxiliary flow measurement device, the cross-sectional area of the outlet of the adapter tube 7 is 2 times of the cross-sectional area of the inlet, so as to reduce the possibility of gas flow separation.
In the intermediary machine casket test piece, the incoming flow air current gets into sprue E, the air current flows through sprue E, shunt in sprue E exit, part gets into outer culvert runner F, part gets into inner culvert runner G, carry out intermediary machine casket test and need obtain outer culvert runner F, the flow of air current in the inner culvert runner G, in order to obtain the culvert channel ratio, under the known situation of entering sprue E air current flow, the accessible is to the measurement of air current flow in the inner culvert runner G, obtain the air current flow in the inner culvert runner G, calculate the difference that gets into sprue E air current flow and the air current flow in the inner culvert runner G, obtain the air current flow in the outer culvert runner F, in order to reduce cost, inner culvert runner G in the intermediary machine casket test piece is processed into fan-shaped more.
Based on the intermediary casing test piece, the effect of the auxiliary flow measurement device provided by the embodiment of the application is verified, and the process is as follows:
according to the shape of the outlet of the culvert flow passage G, the shape of the inlet of the transfer pipe 7 is designed to be in butt joint with the outlet of the culvert flow passage G;
under the known condition of entering main runner E air flow, close outer culvert runner F, the air current that flows through main runner E promptly, at main runner E exit, can all flow into interior culvert runner G, when mach number is 0.2, 0.25, 0.3, 0.321 respectively, measures the air flow in interior culvert runner G, and its result is as follows:
it can be known through the comparison, flow measurement auxiliary device based on that this application embodiment provided is less than 1.5% to air current flow measurement error in the connotation runner G, has higher accuracy, satisfies the requirement of using.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Having thus described the present application in connection with the preferred embodiments illustrated in the accompanying drawings, it will be understood by those skilled in the art that the scope of the present application is not limited to those specific embodiments, and that equivalent modifications or substitutions of related technical features may be made by those skilled in the art without departing from the principle of the present application, and those modifications or substitutions will fall within the scope of the present application.
Claims (10)
1. A flow measurement assistance device characterized by comprising:
a drainage tube (1) with a measuring hole thereon;
and the inlet honeycomb (2) is arranged in the drainage tube (1) and is positioned between the inlet of the drainage tube (1) and the measuring hole.
2. Flow measurement assistance device according to claim 1,
the measuring holes are distributed along the circumferential direction and comprise a total pressure measuring hole (A), a total temperature measuring hole (B) and a static pressure measuring hole (C).
3. Flow measurement assistance device according to claim 1,
and the wire mesh (3) is arranged in the drainage tube (1) and is positioned between the inlet honeycomb (2) and the measuring hole.
4. Flow measurement assistance device according to claim 3,
further comprising:
two baffle rings (4) are provided with criss-cross ribs inside, are arranged in the drainage tube (1), are connected with the inner wall of the drainage tube (1) at the outer edges and are distributed on two sides of the silk screen (3) to clamp the silk screen (3).
5. Flow measurement assistance device according to claim 4,
two groups of the silk screens (3) and the baffle rings (4) corresponding to the silk screens are arranged.
6. Flow measurement assistance device according to claim 5,
the meshes on the two silk screens (3) are distributed in a staggered way.
7. Flow measurement assistance device according to claim 1,
further comprising:
and the flow regulating valve (5) is arranged at the outlet of the drainage tube (1).
8. Flow measurement assistance device according to claim 7,
further comprising:
and the outlet honeycomb (6) is arranged in the drainage tube (1) and is positioned between the outlet of the drainage tube (1) and the measuring hole.
9. Flow measurement assistance device according to claim 1,
further comprising:
the outlet of the adapter tube (7) is butted with the drainage tube (1).
10. Flow measurement assistance device according to claim 16,
the hydraulic radius of the inlet of the adapter tube (7) is R1, and the hydraulic radius of the outlet of the adapter tube is R2;
the length of the adapter tube (7) is L6;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011172259.6A CN112284478A (en) | 2020-10-28 | 2020-10-28 | Auxiliary device for flow measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011172259.6A CN112284478A (en) | 2020-10-28 | 2020-10-28 | Auxiliary device for flow measurement |
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| CN112284478A true CN112284478A (en) | 2021-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011172259.6A Pending CN112284478A (en) | 2020-10-28 | 2020-10-28 | Auxiliary device for flow measurement |
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| CN108896121A (en) * | 2018-06-08 | 2018-11-27 | 华北电力大学 | A kind of axial flow blower flow measurement device based on cross probe |
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Application publication date: 20210129 |