CN107014450B - Noise reduction rectifying structure and ultrasonic flowmeter comprising same - Google Patents
Noise reduction rectifying structure and ultrasonic flowmeter comprising same Download PDFInfo
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- CN107014450B CN107014450B CN201710297781.9A CN201710297781A CN107014450B CN 107014450 B CN107014450 B CN 107014450B CN 201710297781 A CN201710297781 A CN 201710297781A CN 107014450 B CN107014450 B CN 107014450B
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011148 porous material Substances 0.000 claims description 16
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 5
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- 238000009434 installation Methods 0.000 abstract description 10
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- 239000012530 fluid Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
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- 239000006262 metallic foam Substances 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
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- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a noise reduction rectifying structure, which comprises a pipe structure, wherein a primary porous structure and a secondary porous structure are arranged in the pipe structure, the primary porous structure is a porous structure formed by foam metal, and the secondary porous structure is a porous structure formed by a honeycomb aluminum core. The invention can completely replace the straight pipe sections arranged in front and behind the traditional ultrasonic flowmeter, greatly reduces the installation volume of the ultrasonic flowmeter, eliminates the problem of signal drift of the ultrasonic flowmeter in the prior art, and effectively controls the relative error of gas flow measurement within 1 percent. The invention also provides an ultrasonic flowmeter composed of the noise reduction rectification structure.
Description
Technical Field
The invention relates to the technical field of gas metering equipment, in particular to a noise reduction and rectification structure and an ultrasonic flowmeter formed by the same.
Background
The ultrasonic flowmeter is a meter for measuring the flow of fluid in a circular tube by taking a speed difference method as a principle. The flow meter adopts advanced multi-pulse technology, signal digital processing technology and error correction technology, so that the flow meter can be more suitable for the environment of industrial sites, and the metering is more convenient, economical and accurate. The product reaches the advanced level at home and abroad, and can be widely applied to the fields of petroleum, chemical industry, metallurgy, electric power, water supply and drainage and the like. Ultrasonic flow meters are a major trend in the development of fluid metering.
The ultrasonic flowmeter is a non-contact instrument which can be used for measuring medium flow with large pipe diameter and medium which is not easy to contact and observe. The ultrasonic flowmeter needs to collect data signals when in use, so the stability of the signals has great influence on the measurement precision, and therefore, the ultrasonic flowmeter has a disadvantage that: when the gas flows through a plurality of elbows, reducing pipes, filters and other fluids which are easy to change the direction of the gas flow, the gas flow with irregular rotation and movement can influence signal acquisition, so that the measurement accuracy is poor. Therefore, the ultrasonic flowmeter is required to have at least 10D and 5D straight pipe sections at the front and back respectively, and when the ultrasonic flowmeter passes through the front and back straight pipe sections in a certain proportion, air flows in the same direction as the pipe sections, and the air flows are gradually corrected into regular air flows, so that the purpose of accurate measurement is achieved. However, the adoption of a long enough straight pipe section around the ultrasonic flowmeter is naturally helpful for signal acquisition, but sometimes in order to reduce the installation volume of the ultrasonic flowmeter, a rectifying plate is added on the straight pipe section, so that the straight pipe section around the ultrasonic flowmeter can be shortened to a certain extent. In the prior art, an ideal rectifying effect cannot be achieved by an ultrasonic flowmeter adopting a common rectifying plate, timing errors are easy to occur due to poor rectifying effect, and stable signals are difficult to obtain.
Disclosure of Invention
The invention mainly aims to provide a noise reduction rectifying structure and an ultrasonic flowmeter formed by the noise reduction rectifying structure, so as to solve the problem that the ultrasonic flowmeter in the prior art is difficult to acquire stable signals.
In order to achieve the above purpose, the invention provides a noise reduction rectifying structure, which comprises a pipe structure, wherein a primary porous structure and a secondary porous structure are arranged in the pipe structure, the primary porous structure is a porous structure formed by foam metal, and the secondary porous structure is a porous structure formed by a honeycomb aluminum core. The noise reduction and rectification structure can reduce noise and simultaneously pre-rectify the entering gas, the secondary rectification structure can re-rectify the pre-rectified gas, the noise reduction and rectification effect can be achieved under the specific structural condition, the pre-rectification and re-rectification effect can be completely replaced by the straight pipe section arranged front and back of the traditional ultrasonic flowmeter, the installation volume of the ultrasonic flowmeter is greatly reduced, the timing error of the ultrasonic flowmeter in the prior art is eliminated, the problem of signal drift of the ultrasonic flowmeter is solved, and the relative error of gas flow measurement is effectively controlled within 1%. The foam-shaped holes have small pore diameters, can realize small Kong Jiangzao and has a certain rectifying effect on the air flow, but the flow direction of the air after passing through the small holes is inconsistent, and the rectifying effect cannot reach an ideal effect; the honeycomb-shaped air holes are regular, the rectifying effect is good, the two are combined, the ideal noise reduction and rectifying effect can be achieved, the aperture of the foam-shaped holes in the aperture is naturally smaller than that of the honeycomb-shaped air holes, and the primary noise reduction and rectifying structure and the secondary rectifying structure are compact in installation at the installation positions and can be tightly attached to each other in consideration of the fact that the smaller the installation space is, the better the installation space is.
Further, the pore diameter of the primary porous structure is 1-5mm, and the wall thickness is 10-15mm. The primary porous structure is a porous structure formed by foam metal. The porosity of the foam metal can reach more than 90 percent, and the foam metal is porous metal with certain strength and rigidity. The metal material containing foam-like air holes has higher porosity and pore diameter reaching millimeter level compared with the common sintered porous metal. Considering rust prevention, copper foam, aluminum foam and nickel foam are selected for testing the light weight of the aluminum foam and the alloy thereof, and the aluminum foam has the characteristics of sound absorption, heat insulation, vibration reduction, impact energy absorption, electromagnetic wave absorption and the like.
Further, the primary porous structure can be a porous structure formed by one foam metal of foam copper, foam aluminum and foam nickel. The secondary porous structure is a honeycomb aluminum core. The aluminum honeycomb core is formed by bonding multiple layers of aluminum foils, laminating, and stretching and expanding to form a regular hexagonal honeycomb core. The aluminum honeycomb core has sharp and clear pore walls, has no burrs, and is suitable for bonding high-quality core to surface materials and other purposes. The honeycomb plate core layer is a hexagonal aluminum honeycomb structure, and the mutually-held dense honeycomb has a plurality of small I-beams, so that the pressure from the direction of the panel can be dispersedly borne, the stress of the plate is uniform, and the panel can still keep high flatness in a larger area. In addition, the hollow honeycomb can also greatly weaken the thermal expansibility of the plate body. The aluminum honeycomb core material is provided in a form of aluminum honeycomb stack blocks, aluminum honeycomb core strips and stretched aluminum honeycomb core blocks.
Further, the pore diameter of the secondary porous structure is 4-10mm, and the wall thickness is 15-30mm.
Further, a stepped structure for installing the secondary rectifying structure is arranged on the inner wall of the pipe structure for a circle, and the primary noise reduction rectifying structure compresses the secondary rectifying structure at the stepped structure through the compressing structure.
Further, the pressing structure comprises a pressing plate and a bolt structure for fixing the pressing plate.
Further, the primary porous structure is disposed immediately adjacent to the secondary porous structure.
In order to achieve the above purpose, the invention also provides an ultrasonic flowmeter composed of the noise reduction rectifying structure, which comprises an ultrasonic flowmeter main body and the noise reduction rectifying structure arranged at the air inlet of the ultrasonic flowmeter main body, wherein the noise reduction rectifying structure is adopted by the noise reduction rectifying structure.
When the noise reduction rectifying structure is installed on the ultrasonic flowmeter, the noise reduction rectifying structure can be built in the ultrasonic flowmeter or externally connected with the ultrasonic flowmeter, the two structures can realize the noise reduction through the primary noise reduction rectifying structure and simultaneously pre-rectify the entering gas, the secondary rectifying structure arranged by the primary noise reduction rectifying structure can re-rectify the pre-rectified gas immediately, the noise reduction rectifying effect can be realized under the specific structural condition, the effect of re-rectifying can be realized, the straight pipe sections arranged in front of and behind the traditional ultrasonic flowmeter can be completely replaced, the installation volume of the ultrasonic flowmeter is greatly reduced, the problem of signal drift of the ultrasonic flowmeter in the prior art is solved, and the relative error of gas flow measurement is effectively controlled within 1%.
Further, when the noise reduction and rectification structure is externally connected with the ultrasonic flowmeter, the pipe structure is a connecting pipe externally connected with the air inlet end of the main body of the ultrasonic flowmeter.
Further, when the noise reduction and rectification structure is arranged in the ultrasonic flowmeter, the pipe structure is an ultrasonic flowmeter valve body.
Therefore, the invention can completely replace the straight pipe sections arranged in front and behind the traditional ultrasonic flowmeter, greatly reduces the installation volume of the ultrasonic flowmeter, eliminates the problem of signal drift of the ultrasonic flowmeter in the prior art, and effectively controls the relative error of gas flow measurement within 1 percent. The invention is suitable for the technical field of gas flow measurement, in particular for application to ultrasonic flow meters.
The invention is further described below with reference to the drawings and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which form a part hereof, are shown by way of illustration and not of limitation, and in which are shown by way of illustration and description of the invention. In the drawings:
fig. 1 is a schematic structural diagram of an ultrasonic flowmeter according to the present invention with a noise reduction and rectification structure built in.
Fig. 2 is a schematic structural diagram of the noise reduction rectifying structure of the present invention when the noise reduction rectifying structure is built in.
Fig. 3 is a schematic structural diagram of the ultrasonic flowmeter according to the present invention when the noise reduction and rectification structure is external.
Fig. 4 is a schematic structural diagram of the noise reduction rectifying structure of the present invention when the noise reduction rectifying structure is external.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be noted in particular that:
(1) The technical solutions and technical features provided in the sections including the following description in the present invention may be combined with each other without conflict.
(2) The embodiments of the invention that are referred to in the following description are typically only some, but not all embodiments of the invention. Therefore, all other embodiments, which can be made by one of ordinary skill in the art without undue burden, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
(3) With respect to the description of the terms in the present invention. The terms "first," "second," and the like in the description and in the claims and in the related sections of this invention are used for distinguishing between objects that are easily miscible and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprising," "including," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion. The term "having strength" means having the ability to resist damage under the action of external force, and the primary porous structure and the secondary porous structure in the present invention can resist the pressure formed by the gas passing through under the condition that the gas flow passes through continuously, and keep the original form unchanged. The term "relative error" is the error between the measured flow and the standard calibration device. The accuracy of ultrasonic flowmeter in national standard requires controlling the relative error of the above gas flow measurement to 1.0 level. Wherein the term "pore size" refers to the average diameter of the average pore size.
The noise reduction and rectification structure comprises a pipe structure, wherein a primary porous structure 2 and a secondary porous structure 3 are arranged in the pipe structure, the primary porous structure 2 is a porous structure formed by foam metal, and the secondary porous structure 3 is a porous structure formed by a honeycomb aluminum core.
The pore diameter of the primary porous structure 2 is 1-5mm, and the wall thickness is 10-15mm.
The primary porous structure 2 is a porous structure formed by foam metal.
The primary porous structure 2 can be a porous structure formed by one foam metal of foam copper, foam aluminum and foam nickel.
The secondary porous structure 3 is a honeycomb aluminum core.
The pore diameter of the secondary porous structure 3 is 4-10mm, and the wall thickness is 15-30mm.
The inner wall of the pipe structure is provided with a stepped structure for installing the secondary porous structure 3, and the primary porous structure 2 compresses the secondary porous structure 3 at the stepped structure through a compressing structure.
The pressing structure comprises a pressing plate 4 and a bolt structure for fixing the pressing plate 4.
The primary porous structure 2 is disposed immediately adjacent to the secondary porous structure 3.
The ultrasonic flowmeter comprises an ultrasonic flowmeter main body and a noise reduction rectifying structure arranged at the air inlet of the ultrasonic flowmeter main body, wherein the noise reduction rectifying structure adopts the noise reduction rectifying structure.
The pipe structure is a connecting pipe A externally connected with the air inlet of the ultrasonic flowmeter main body.
The pipe structure is an ultrasonic flowmeter valve body B.
Fig. 1 is a schematic structural diagram of an ultrasonic flowmeter according to the present invention with a noise reduction and rectification structure built in. As shown in fig. 1, when the noise reduction and rectification structure is built-in, the ultrasonic flowmeter of the invention comprises an ultrasonic flowmeter body and a connecting pipe A connected with the ultrasonic flowmeter body, wherein the ultrasonic flowmeter body comprises an ultrasonic flowmeter valve body B, a flowmeter meter body 5 arranged on the ultrasonic flowmeter valve body B and a transducer 7 arranged on the ultrasonic flowmeter valve body B.
Fig. 2 is a schematic structural diagram of the noise reduction rectifying structure of the present invention when the noise reduction rectifying structure is built in. As shown in fig. 2, the connecting pipe a includes a connecting pipe main body 1 and flanges disposed at two ends of the connecting pipe main body 1, a connecting pipe step structure 12 is disposed on an inner wall of an air inlet end of the connecting pipe main body 11, and a pressing plate 4, a primary porous structure 2 and a secondary porous structure 3 are sequentially disposed at the air inlet end of the connecting pipe main body 1, wherein the primary porous structure 2 is a plate-shaped porous structure formed by foam metal, the secondary porous structure 3 is a plate-shaped porous structure formed by honeycomb aluminum cores, the pressing plate 4 is connected with the air inlet end flange 11 through a bolt structure, and the pressing plate 4 compresses the primary porous structure 2 and the secondary porous structure 3 on the connecting pipe step structure 12 when the bolt structure is screwed. The connecting pipe main body 1 is a short pipe.
Referring to fig. 1 and 2, the valve body B of the ultrasonic flowmeter includes a tubular valve body 6 and flanges disposed at two ends of the tubular valve body 6, and the flange 13 at the air outlet end of the adapter body 1 is connected with the flange 61 at the air inlet end of the tubular valve body 6 by bolts 130, and then is screwed by nuts 610, thereby forming the whole ultrasonic flowmeter.
Fig. 3 is a schematic structural diagram of the ultrasonic flowmeter according to the present invention when the noise reduction and rectification structure is external. As shown in fig. 3, when the noise reduction and rectification structure is external, the ultrasonic flowmeter of the invention comprises an ultrasonic flowmeter valve body B, a flowmeter meter body 5 arranged on the ultrasonic flowmeter valve body B and a transducer 7 arranged on the ultrasonic flowmeter valve body B.
As shown in fig. 4, the valve body B of the ultrasonic flowmeter comprises a tubular valve body 6 and flanges disposed at two ends of the tubular valve body 6, a valve body step structure 62 is disposed on an inner wall of an inlet end of the tubular valve body 6, and a pressing plate 4, a primary porous structure 2 and a secondary porous structure 3 are sequentially disposed at the inlet end of the tubular valve body 6, wherein the primary porous structure 2 is a plate-shaped porous structure formed by foam metal, the secondary porous structure 3 is a plate-shaped porous structure formed by a honeycomb aluminum core, the pressing plate 4 is connected with the valve body air inlet end flange 61 through a bolt structure, and the pressing plate 4 compresses the primary porous structure 2 and the secondary porous structure 3 on the valve body step structure 62 when the bolt structure is screwed. The metal foam is capable of providing a primary porous structure 2 with a porosity of > 90%.
The ultrasonic flowmeter when the noise reduction rectification structure is arranged outside is slightly larger in volume than the ultrasonic flowmeter when the noise reduction rectification structure is arranged inside, and the two ultrasonic flowmeters have no obvious difference in use effect.
The invention is further illustrated by the following calibration tests of ultrasonic flow meters of different configurations. The above experiments included examples 1-3, comparative examples 1-24.
The calibration test of the ultrasonic flowmeter is to connect the ultrasonic flowmeter with the negative pressure calibration device for calibration, the calibration method is the calibration method in the prior art, which is not described in detail herein, and the negative pressure of-250 pa is uniformly adopted for calibration in the test.
In the test, the noise reduction and rectification structures of the embodiments 1-3 are installed according to the sequence that the gas firstly passes through a foam copper porous plate-shaped structure with the wall thickness of 10mm and the aperture of 2mm and then passes through a honeycomb aluminum core porous plate-shaped structure with the wall thickness of 15mm and the aperture of 6 mm; the structural difference between comparative examples 1-3 and examples 1-3 is that the ultrasonic flowmeter body of comparative examples 1-3 is not provided with noise reduction and rectification structures in front and back; the structural difference between the comparative examples 4-6 and the examples 1-3 is that the noise reduction and rectification structure of the comparative examples 4-6 adopts a 10D straight pipe section arranged at the front part of the ultrasonic flowmeter main body and a 5D straight pipe section arranged at the rear part; the structural difference between comparative examples 7-9 and examples 1-3 is that the noise reduction and rectification structures of comparative examples 7-9 were installed in a honeycomb aluminum core porous plate-like structure having a wall thickness of 5mm and an aperture of 10mm, in accordance with the gas; the comparative examples 10 to 12 are structurally different from examples 1 to 3 in that the noise reduction and rectification structures of comparative examples 10 to 12 are installed in such a manner that the gas passes through only a cellular aluminum core porous plate-like structure having a wall thickness of 15mm and an aperture of 10mm; the comparative examples 13 to 15 are structurally different from examples 1 to 3 in that the noise reduction and rectification structures of comparative examples 13 to 15 are installed in such a manner that the gas passes through only a cellular aluminum core porous plate-like structure having a wall thickness of 15mm and an aperture of 6 mm; the noise reduction and rectification structures of comparative examples 16-18 were installed in such a manner that the gas passed through only a foam copper porous plate-like structure having a wall thickness of 10mm and an aperture of 2 mm; the noise reduction and rectification structures of comparative examples 18-21 were installed in such a manner that the gas passed through only a foam copper porous plate-like structure having a wall thickness of 10mm and an aperture of 1 mm; the noise reduction and rectification structures of comparative examples 22-24 were installed in a manner such that the gas was first passed through a cellular aluminum core porous plate-like structure having a wall thickness of 15mm and an aperture of 6mm, and then passed through a foam copper porous plate-like structure having a wall thickness of 10mm and an aperture of 2 mm. The comparative examples 25-27 differ from examples 1-3 in structure in that the primary porous structure of comparative examples 25-27 has a pore diameter < 1mm and a wall thickness < 10mm; the pore diameter of the secondary porous structure is less than 4mm, and the wall thickness is less than 15mm. The comparative examples 28 to 30 differ from examples 1 to 3 in structure in that the primary porous structures of comparative examples 25 to 27 have a pore diameter of > 5mm and a wall thickness of > 15mm; the pore diameter of the secondary porous structure is more than 10mm, and the wall thickness is more than 30mm.
The specific tests are shown in Table 1 below.
TABLE 1
As can be seen from the above table, only the relative errors of the embodiments 1-3 under each test pressure are completely controlled within 1.0%, so that the problem of signal drift of the ultrasonic flowmeter in the prior art is eliminated, the relative errors of gas flow measurement are effectively controlled within 1%, meanwhile, the noise reduction rectifying structure of the embodiments 1-3 can completely replace the straight pipe sections arranged in front of and behind the existing ultrasonic flowmeter, the installation volume of the ultrasonic flowmeter is greatly reduced, and the gas rectifying effect is obviously better than that of the structure in the prior art in which the straight pipe sections are arranged in front of and behind the ultrasonic flowmeter. It is apparent from examples 1 to 3 and comparative examples 7 to 24 that the above-described desirable rectifying effect can be achieved only by adopting the mounting structure and the mounting order of the noise reduction rectifying structure in the present invention. The copper foam in the above test can be replaced with aluminum foam or nickel foam, and has no obvious difference in gas rectifying effect from examples 1 to 3.
The noise reduction test is continued for the invention examples 1-3, the background noise is tested before and after the ultrasonic flowmeter when the air in the pipeline is static by using the microphone, and then the noise attenuation can reach 15 db by testing the attenuation of the noise frequency at 200 KHz. Experiments prove that the embodiment 1-3 of the invention can effectively reduce noise generated in the gas circulation process, can realize noise reduction through the noise reduction rectification structure of the foam metal porous plate-shaped structure, simultaneously pre-rectify the entering gas, and can immediately re-rectify the pre-rectified and noise reduced gas through the honeycomb aluminum core porous plate-shaped structure, so that an excellent noise reduction rectification effect is achieved.
In addition, in the specific embodiment of the invention, the pore diameter of the porous plate-shaped structure of the foam copper which is the primary porous structure can be selected from specifications such as 1mm, 1.5mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.5mm, 4mm, 4.5mm and 5mm, and the wall thickness can be selected from specifications such as 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm and 15mm; the pore diameter of the cellular aluminum core porous plate-like structure as the secondary porous structure may be selected from the specifications of 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.1mm, 6.2mm, 6.3mm, 6.4mm, 6.5mm, 6.6mm, 6.7mm, 6.8mm, 6.9mm, 7.0mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm, 8.0mm, 8.5mm, 9mm, 9.5mm, 10mm, etc., and the wall thickness may be selected from the specifications of 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, etc., and the above-mentioned specifications may be arbitrarily combined to achieve the above-mentioned effects of the present invention.
Claims (7)
1. The noise reduction and rectification structure for the ultrasonic flowmeter comprises a pipe structure and is characterized in that a primary porous structure (2) and a secondary porous structure (3) are arranged in the pipe structure, the primary porous structure (2) is a porous structure formed by foam metal, and the secondary porous structure (3) is a porous structure formed by a honeycomb aluminum core; the aperture of the primary porous structure (2) is 1-5mm, and the wall thickness is 10-15mm; the aperture of the secondary porous structure (3) is 4-10mm, and the wall thickness is 15-30mm; the pore diameter of the primary porous structure (2) is smaller than that of the secondary porous structure (3); the primary porous structure (2) is arranged next to the secondary porous structure (3).
2. The noise reduction and rectification structure for an ultrasonic flow meter according to claim 1, wherein the primary porous structure (2) is a porous structure composed of one foam metal of foam copper, foam aluminum and foam nickel.
3. The noise reduction and rectification structure for an ultrasonic flowmeter according to claim 1, wherein the inner wall of the pipe structure is provided with a stepped structure for installing the secondary porous structure (3) in a circle, and the primary porous structure (2) compresses the secondary porous structure (3) at the stepped structure through a compression structure.
4. A noise reducing and rectifying structure for an ultrasonic flow meter according to claim 3, characterized in that said pressing structure comprises a pressing plate (4) and a bolt structure fixing the pressing plate (4).
5. The ultrasonic flowmeter comprises an ultrasonic flowmeter main body and a noise reduction and rectification structure arranged at the air inlet of the ultrasonic flowmeter main body, and is characterized in that the noise reduction and rectification structure is the noise reduction and rectification structure for the ultrasonic flowmeter according to any one of claims 1-4.
6. The ultrasonic flow meter of claim 5, wherein the tubular structure is a nipple (a) circumscribing an air inlet of the ultrasonic flow meter body.
7. The ultrasonic flow meter of claim 5, wherein the tube structure is an ultrasonic flow meter valve body (B).
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| CN110388972B (en) * | 2018-04-17 | 2021-04-30 | 中国石油天然气股份有限公司 | Serial calibrating device and method for non-isodiametric ultrasonic flowmeter |
| CN108759948A (en) * | 2018-08-31 | 2018-11-06 | 四川菲罗米特仪表有限公司 | A kind of built-in rectifier of gas ultrasonic flowmeter |
| CN110967079B (en) * | 2019-10-25 | 2021-05-11 | 上海中核维思仪器仪表有限公司 | Plug-in type gas ultrasonic flowmeter with uniformly distributed gas flow |
| CN112747260B (en) * | 2020-12-29 | 2023-01-03 | 中国华能集团清洁能源技术研究院有限公司 | Ultrasonic flow measuring device capable of preventing noise interference |
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