CN110333176A - A kind of device and its measurement method of flux controllable measurement acoustics flow resistance - Google Patents
A kind of device and its measurement method of flux controllable measurement acoustics flow resistance Download PDFInfo
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- 238000005259 measurement Methods 0.000 title claims abstract description 149
- 230000004907 flux Effects 0.000 title claims abstract description 32
- 238000000691 measurement method Methods 0.000 title claims description 18
- 238000012360 testing method Methods 0.000 claims abstract description 88
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 31
- 239000011148 porous material Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 22
- 229940099259 vaseline Drugs 0.000 claims description 16
- 238000012797 qualification Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000000741 silica gel Substances 0.000 claims description 6
- 229910002027 silica gel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 2
- 239000011358 absorbing material Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
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- 230000009467 reduction Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000004364 calculation method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000004519 grease Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000003801 milling Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005534 acoustic noise Effects 0.000 description 1
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- 238000010297 mechanical methods and process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/12—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water
- G01M3/14—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/143—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for pipe joints or seals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
A kind of device of flux controllable measurement acoustics flow resistance, including efficiently mute negative-pressure vacuum pump machine head, precision flow regluating valve, high-precision gas mass flowmenter, measurement pipe and intelligent digital differential manometer；Efficiently mute negative-pressure vacuum pump machine head, precision flow regluating valve, high-precision gas mass flowmenter, measurement pipe and the intelligent digital differential manometer pass sequentially through silicone tube and are attached.The measurement pipe is the top opening of strip, the closed cylinder in bottom, the bottom of the measurement pipe is provided with measurement pipe measuring mouth and measurement pipe air inlet, the inner cavity of the measurement pipe is provided with the card slot of protrusion, and the internal diameter of the measurement pipe and the diameter of test specimen are adapted.The device simple structure, design is light and handy, measures easy to operate, disturbance is not generated, and data adjusting exact extension is wide, and measuring accuracy is high, the flow resistivity that sound-absorbing porous material can be measured during research and production, the consistency of sound-absorbing porous material is controlled with this, guarantees the noise reduction effect of sound-absorbing material.
Description
Technical field
The invention belongs to acoustic noise field of measuring technique, be related to a kind of flux controllable measurement acoustics flow resistance device and
Its measurement method.
Background technique
Flow resistance indicates the draught head of material ends and flows through the ratio between gas linear velocity of material.The calculation formula of flow resistance are as follows:
R=p/u；
In formula: p-material ends draught head, unit Pa；
U-gas flows through the linear velocity of material, unit m/s；
R-flow resistance, unit Pam/s；
Flow resistance is an important parameter of reaction material acoustic characteristic, studies have found that depositing between flow resistance and the acoustic absorptivity of material
In the relationship of an optimum value.It reflects the relationship between the structure of porous material acoustic characteristic and its material, production method, and
It can ensure that product quality (quality control).Specifying measurement stream in specification GB ∕ T 25077 " measurement of acoustics sound-absorbing porous material flow resistance "
There is direct current method A in the method for resistance, is all using flow resistance instrument adopting water tank method now in direct current method A.
Flow resistance instrument adopting water tank method is mentioned in flow resistance instrument adopting water tank method disclosed in notification number CN201319029Y by sealing radiator, minute-pressure
Composition is sealed after power meter, test specimen casket, graduated cylinder, stopwatch or stopwatch, the connection of six part of water source, flow resistance instrument adopting water tank method is measurement and control
The flow resistance of sound-absorbing material, flow resistance are to determine the indispensable key factor of material sound absorption effect, and system pressure is stablized, letter
Single easy, economical and practical, for air-flow caused by being discharged water using airtight water tank as gas source, valve opening, which sluices, generates air-flow, when air-flow passes through
When test block, test block both ends can generate pressure difference, measure its difference, can calculate stream in conjunction with the air-flow velocity degree Jing Guo test block
Resistance value.But this measurement method has the following deficiencies: the water discharged amount by then passing through certain time to calculate water velocity, uses water
The flow velocity of flow velocity degree equivalence gas and indirectly measurement；And in actual mechanical process, it is difficult to ensure that each flow measurement and control
The precision of system.However the speed of water flow is difficult to accurately adjust, and is difficult to ensure that water flow is the at the uniform velocity therefore gas flow rate obtained
It can only be the average speed of a period of time, and pressure difference is the amount of a real-time change, the flow resistance calculated so is necessarily deposited
In large error, and water tank volume is huge, shows slightly heavy, it is therefore desirable to which one kind is easy to operate, easily controllable, measurement is accurately set
It is standby to measure flow resistivity in favor of more convenient and fast in scientific research and production.
Summary of the invention
The purpose of the present invention is to provide a kind of device of flux controllable measurement acoustics flow resistance can provide it is stable, controllable
Gas flow rate, solve the problems, such as the casual problem uncontrollable, test specimen installation is inconvenient of the cumbersome, flow of existing measurement, and meeting
The problem of influencing the accuracy of measurement.
The technical solution to solve the above problems is: a kind of device of flux controllable measurement acoustics flow resistance, including efficiently quiet
Sound negative-pressure vacuum pump machine head, precision flow regluating valve, high-precision gas mass flowmenter, support frame, measurement pipe and intelligent digital
Differential manometer；The vacuum pump head air inlet of the efficiently mute negative-pressure vacuum pump machine head passes through silicone tube and precision flow regluating valve
The connection of adjusting valve air gate, the regulating valve air inlet of the precision flow regluating valve passes through silicone tube and high-precision gas quality
The flowmeter gas outlet of flowmeter connects；The measurement pipe is the top opening of strip, the closed cylinder in bottom, the measurement
The bottom of pipe is provided with measurement pipe measuring mouth and measurement pipe air inlet, and the inner cavity of the measurement pipe is provided with the card slot of protrusion, institute
The diameter of the internal diameter and test specimen of stating measurement pipe is adapted；The measurement pipe installation is on the support frame；The high-precision gas quality
The flowmeter air inlet of flowmeter is connected by the measurement pipe measuring mouth of silicone tube and measurement pipe；The intelligent digital differential manometer is set
It is equipped with differential manometer measuring mouth and differential manometer normal pressure mouth, the differential manometer measuring mouth is connect with measurement pipe air inlet by silicone tube,
The external atmospheric pressure of differential manometer normal pressure mouth.
Further technical solution is: the device is also configured with guide pipe, and the guide pipe is the cylinder of both ends open, described
For placing test specimen, the internal diameter of the guide pipe and the diameter of test specimen are adapted for the inner cavity of guide pipe；The guide pipe is movable to be put
It sets in measurement tube cavity, bottom is located on card slot, and top is higher by the top of measurement pipe.
Further technical solution is: handle, the handle groove or handle are provided at the top of the guide pipe.
Further technical solution is: the card slot is arranged at 20 ~ 100 mm of range measurement bottom of the tube.
Further technical solution is: the guide pipe is formed or is welded by the polishing of stainless steel tube material, when being placed on
When in measurement pipe, the top at least 30mm of measurement pipe is higher by the top of the guide pipe.
Further technical solution is: the power of the mute electric vacuum pump head is 3000W, air-flow can stepless time adjustment from
0~280L/max；The maximum diameter of the Miniature precision flow control valve is 4mm, voltage endurance capability≤0.12Mpa；The high-precision
The range of gas mass flow meter: 0 ~ 25L/min, precision ± (2.5+0.5FS) %, pressure≤0.12Mpa.
Its is relevant another solution is that a kind of measurement method of the device of flux controllable measurement acoustics flow resistance, is somebody's turn to do
Method is that the flow resistance of sound-absorbing porous material test specimen is measured using the device of the above-mentioned flux controllable measurement acoustics flow resistance of one kind
The measurement method of characteristic when measurement, is carried out according to the following steps:
A, with silicone tube connecting components, after checking that each component operates normally, the airtight of detection device is carried out using bubble method
Property: fluorocarbon oil leak detection liquid is smeared in the interface of each silica gel pipeline, starts device work, checks silicone tube interface, if
There is bubble generation, is to examine qualification without bubble if there is bubble then checks leak stopping；Qualification is examined to turn off efficient mute negative pressure true
Empty pump machine head power supply；
B, by the test specimen for the sound-absorbing porous material to be measured made, thin layer vaseline is spread around four Mondays circle, is vertically put
Enter inside measurement pipe, until test specimen bottom touches groove position, places steady；
C, starting efficiently mute negative-pressure vacuum pump machine head, adjustment precision flow control valve observes high-precision gas mass flowmenter,
By adjustment precision Flux Valve Control air velocity, air velocity required for selecting, after steady air current, real-time streams
Speed can be read by high-precision gas mass flowmenter, record the pressure difference of intelligent digital differential manometer；
D, duplicate measurements multi-group data takes flow resistance average value, and the flow resistivity size of the material test specimen is calculated according to modular formula；
E, different airflow volume speed is adjusted, different pressure differences is measured；
F, after being measured, turn off the switch of each component, the test specimen of sound-absorbing porous material is taken out from measurement pipe inside, is put on the skin
The inner wall of clean measurement pipe, in case next time uses.
Its is relevant and another solution is that this method is using the above-mentioned flux controllable measurement acoustics flow resistance of one kind
Device measure the measurement method of the flow resistance characteristic of sound-absorbing porous material test specimen, when measurement, carried out according to the following steps:
A, with silicone tube connecting components, after checking that each component operates normally, the airtight of detection device is carried out using bubble method
Property: fluorocarbon oil leak detection liquid is smeared in the interface of each silica gel pipeline, starts device work, checks silicone tube interface, if
There is bubble generation, is to examine qualification without bubble if there is bubble then checks leak stopping；Qualification is examined to turn off efficient mute negative pressure true
Empty pump machine head power supply；
B, it by the test specimen for the sound-absorbing porous material to be measured made, circumferentially spreads after thin layer vaseline from guide pipe bottom
Portion is put into inside guide pipe, and test specimen is placed until end is concordant with guiding bottom of the tube, and handle, guide pipe external application are held in overturning
Vaseline is inserted directly into measurement pipe, until guiding bottom of the tube touches groove position, is placed steady；
C, starting efficiently mute negative-pressure vacuum pump machine head, adjustment precision flow control valve observes high-precision gas mass flowmenter,
By adjustment precision Flux Valve Control air velocity, air velocity required for selecting, after steady air current, real-time streams
Speed can be read by high-precision gas mass flowmenter, record the pressure difference of intelligent digital differential manometer；
D, duplicate measurements multi-group data is averaged, and the flow resistivity size of the material test specimen is calculated according to modular formula；
E, different air velocities is adjusted, different pressure differences is measured；
F, after being measured, turn off the switch of each component, the handle of measurement pipe guide pipe is grabbed, by guide pipe directly from measurement
Pipe takes out, and the test specimen in removal guide pipe, the vaseline put clean measurement pipe on the skin, be oriented to inside pipe wall, in case next time uses.
Further technical solution is: the step E, different air velocities is adjusted, respectively by airflow volume speed control
In the L/min airflow volume speed of 0.55L/min, 0.5 L/min, 0.4 L/min, 0.3 L/min, 0.1, different pressures is measured
Difference calculates flow resistance value.
Further technical solution is: repeating step B- step E, can measure different sound-absorbing porous material test specimens.
Therefore, compared with prior art, the present invention " it is a kind of it is flux controllable measurement acoustics flow resistance device and its measurement
Method " has the advantages that the device simple structure of flux controllable measurement acoustics flow resistance of the invention, and design is light and handy,
It measures easy to operate, does not generate disturbance, data adjust that exact extension is wide, and measuring accuracy is high, can be during research and production
The flow resistivity for measuring sound-absorbing porous material, the consistency of sound-absorbing porous material is controlled with this, guarantees the noise reduction effect of sound-absorbing material.
The mute negative-pressure vacuum pump machine head and precision flow regluating valve 2 that the another present apparatus provides can continuous gas entry, precise gas flow and provide
Constant flow velocity overcomes mass flow discrepancy, gas flow rate is difficult to maintain the disadvantages of constant.It is specific as follows:
1, the gas flow of the device of the invention is provided by mute electric vacuum pump head 1, the mute electric vacuum pump head 1
It is small in size, power 3000W, air-flow can stepless time adjustment from 0 ~ 280L/max, air-flow nozzle connects 8mm tracheae, and (size can basis
It needs to set).It connects power supply and generates steady air current, mute, with small vibration, strong antijamming capability.
2, the gas flow adjusting of the device of the invention is provided by Miniature precision flow control valve 2, the Miniature precision flow
2 maximum diameter Φ=4mm of regulating valve, small in size, voltage endurance capability≤0.12MPa can be according to requiring electrodeless adjustment.
3, the gas strength control of the device of the invention is controlled by high-precision gas mass flowmenter 3, the high-precision
30 ~ 25L/min of range of gas mass flow meter, precision ± (2.5+0.5FS) %, pressure≤0.12MPa.
4, the draught head of the device of the invention show that the intelligent digital is micro- by the measurement of 8 high stable of intelligent digital differential manometer
Pressure 8 pressure limits of meter: 0- ± 3000Pa, elementary error: ± 1%F.S, maximum overload ability :≤200%F.S class of accuracy 1
Grade, resolution ratio: 1Pa.
5, the test specimen of the device of the invention is placed and measurement is realized by measurement pipe 5: measurement pipe is by smooth aluminium alloy or stainless
Steel is integrally formed, referring to fig. 2, in figure, internal diameter Φ D1 >=98mm of measurement pipe, length H1 >=190mm, bottom of the tube distance H3=20 ~
100 mm are equipped with card slot, and the porous material test specimen of respective diameters Φ D1 is vertically put into measurement pipe by when installation, until slot
It sets, places steady.The size design meets code requirement: measurement pipe height H meets unidirectional laminar air flow and flows in and out test specimen,
And its height H is at least 100mm bigger than the thickness d of test specimen.The standard thickness of the test specimen of porous material presses specification=100mm, i.e., generally
The thickness d of test specimen=100 mm(are referring to Fig. 3).
6, the measurement tube shape of the device of the invention is the upper end opening of strip, the cylinder of lower end closed, by test specimen
Being vertically mounted to card slot and testing completion takes out very troublesome, therefore the device of the invention increases guide pipe 6, by stainless steel tube
Equal materials are polished, and bore Φ D3 >=96mm is oriented to, and guiding pipe outside diameter and corresponding measurement pipe id tolerance cooperate, that is, be oriented to
Pipe outside diameter Φ D2=measurement bore Φ D1, height H2 >=H1+30 (mm) (referring to fig. 2), groove milling or welding on guide pipe
Handle facilitates test specimen to take out in measurement pipe.When measurement, guiding pipe outside diameter spreads thin layer silicone grease or vaseline, by corresponding Φ D3
Test specimen outer diameter spreads silicone grease or vaseline, is packed into guiding bottom of the tube, lifts handle and guide pipe is inserted into measuring cylinder, until card slot
?.
7, tube wall sealing silicone grease or vaseline use silicone grease or all because tube wall is all tight fit between each other
Intellectual circle had not only played the role of gas tight seal but also had lubricated, and when disassembly facilitates erasing again.By can guarantee that air-flow is entirely after sealing
By the surface of test block material, accuracy, the science of measurement are improved, the sealing problem of tube wall is solved.
Device to the flux controllable measurement acoustics flow resistance of one kind of the present invention and its survey with reference to the accompanying drawings and examples
The technical characteristic of amount method is described further.
Detailed description of the invention
Fig. 1: the apparatus structure schematic diagram of the flux controllable measurement acoustics flow resistance of one kind of the present embodiment；
Fig. 2: the measurement pipe and guide pipe scale diagrams of the present embodiment；
Fig. 3: the scale diagrams of the test block of the present embodiment；
Fig. 4: the present embodiment has reeded guide pipe scale diagrams；
Fig. 5: the present embodiment has the guide pipe scale diagrams of handle.
In figure:
The efficiently mute negative-pressure vacuum pump machine head of 1-, 11- vacuum pump head air inlet, 2- precision flow regluating valve, 21- regulating valve
Gas outlet, 22- regulating valve air inlet, 3- high-precision gas mass flowmenter, 31- flowmeter gas outlet, 32- flowmeter air inlet
Mouth, 4- support frame, 5- measurement pipe, 51- measurement pipe measuring mouth, 52- measurement pipe air inlet, 53- card slot, 6- guide pipe, 61- are recessed
Slot, 62- handle, 7- test specimen, 8- intelligent digital differential manometer, 81- differential manometer measuring mouth, 82- differential manometer normal pressure mouth, 9- silicone tube.
Arrow in figure indicates the direction of air motion.
Specific embodiment
Embodiment 1:
A kind of device of flux controllable measurement acoustics flow resistance, constructional device is as shown in Figure 1, include efficient mute negative-pressure vacuum
Pump machine head 1, precision flow regluating valve 2, high-precision gas mass flowmenter 3, support frame 4, measurement pipe 5 and intelligent digital differential manometer
8；The vacuum pump head air inlet 11 of the efficiently mute negative-pressure vacuum pump machine head 1 passes through silicone tube 9 and precision flow regluating valve 2
Adjusting valve air gate 21 connect, the regulating valve air inlet 22 of the precision flow regluating valve 2 passes through silicone tube 9 and high-precision gas
The flowmeter gas outlet 31 of weight flowmeter 3 connects；The measurement pipe 5 is the top opening of strip, the closed circle in bottom
Cylinder, the bottom of the measurement pipe 5 are provided with measurement pipe measuring mouth 51 and measurement pipe air inlet 52, and the inner cavity of the measurement pipe 5 is set
It is equipped with the card slot 53 of protrusion, which is one circular, and the internal diameter of the measurement pipe 5 and the diameter of test specimen 7 are adapted；The survey
Buret 5 is mounted on support frame 4；The flowmeter air inlet 32 of the high-precision gas mass flowmenter 3 is by silicone tube 9 and surveys
The measurement pipe measuring mouth 51 of buret 5 connects；The intelligent digital differential manometer 8 is provided with differential manometer measuring mouth 81 and differential manometer normal pressure
Mouth 82, the differential manometer measuring mouth 81 are connect with measurement pipe air inlet 52 by silicone tube 9, and the differential manometer normal pressure mouth 82 is external
Atmospheric pressure.
The measurement pipe is integrally formed or is welded by smooth aluminium alloy or stainless steel, internal diameter D1 at least 98mm, institute
Card slot is stated to be arranged at 20 ~ 100 mm of range measurement bottom of the tube.
The power of the mute electric vacuum pump head 1 is 3000W, air-flow can stepless time adjustment from 0 ~ 280L/max；It is described
The maximum diameter of Miniature precision flow control valve 2 is 4mm, voltage endurance capability≤0.12Mpa；The high-precision gas mass flowmenter
3 range: 0 ~ 25L/min, precision ± (2.5+0.5FS) %, pressure≤0.12Mpa.
The silicone tube is flexible, good airproof performance, resistance to certain pressure.4 ~ 12mm can be selected in diameter range.
To solve the problems, such as that measurement pipe test block installation is convenient and efficient, which is also configured with guide pipe 6, i.e., in measurement pipe 5
Inside increase guide pipe 6, guide pipe has handle, can groove milling can weld handle, extract place test specimen it is convenient and efficient.
The guide pipe 6 is the cylinder that both ends are all open, and the inner cavity of the guide pipe 6 is for placing test specimen 7, the guide pipe
6 internal diameter and the diameter of test specimen are adapted；The guide pipe 6 is movable to be placed on 5 inner cavity of measurement pipe, and bottom is located at card slot
On, top is higher by the top of measurement pipe 5.The size relationship of measurement pipe 5 and guide pipe is shown in Fig. 2, is higher than at H1 in guide pipe
Top can groove milling or welding handle, i.e., the top of the described guide pipe 6 is milled with groove 61(referring to fig. 4) or be welded with handle 62
(referring to Fig. 5) convenient for quick load test specimen and extracts guide pipe.Measurement pipe 5 and 6 size of guide pipe measure flow resistance as needed
Test block is selected.In the present embodiment, the guide pipe 6 is polished by stainless steel tube material, when being placed in measurement pipe 5
When, the top of the guide pipe 6 is higher by the top at least 30mm of measurement pipe 5.
Embodiment 2:
A kind of measurement method of the device of flux controllable measurement acoustics flow resistance, this method is using a kind of stream described in implementation 1
The device of the controllable measurement acoustics flow resistance of amount measures the measurement method of the flow resistance characteristic of sound-absorbing porous material test specimen, when measurement,
It is carried out according to the following steps:
A, equipment presses Fig. 19 connecting components of silicone tube, after checking that each component operates normally, is detected using bubble method
The air-tightness of device: fluorocarbon oil leak detection liquid is smeared in the interface of each silica gel pipeline, starting device work, (starting includes efficient
Mute negative-pressure vacuum pump machine head power supply, high-precision gas mass flowmenter power supply, intelligent digital differential manometer power supply and accurate stream
Adjustable valve etc.), check silicone tube interface, if having bubble generation, be inspection without bubble if there is bubble then checks leak stopping
Test qualification；Qualification is examined to turn off efficient mute negative-pressure vacuum pump machine head power supply.
B, by the test specimen for the sound-absorbing porous material to be measured made, thin layer vaseline is spread around four Mondays circle, is hung down
It is directly put into inside measurement pipe, until test specimen bottom touches groove position, places steady；
C, start efficiently mute negative-pressure vacuum pump machine head 1, adjustment precision flow control valve 2 observes high-precision gas mass flow
Meter 3 controls air velocity by adjustment precision flow control valve 2, air velocity required for selecting, after steady air current,
Real-time flow rate can be read by high-precision gas mass flowmenter 3, record the pressure difference of intelligent digital differential manometer 8；
D, duplicate measurements multi-group data takes flow resistance average value, and the flow resistivity r size of the material test specimen is calculated according to modular formula；
It is specific as follows:
Repeat above two steps of B, C, each test specimen takes flow resistance average value in the measurement of same flow velocity three times, according to formula (1) ~
(3) flow resistance characteristic of material is calculated, and examines the sound absorbing performance of sound-absorbing material with flow resistance characteristic.
1. the calculating of flow resistance R is indicated by formula (1), unit is the every cubic meter per second (Pas/m of Pascal3)。
(1)
In formula:
P-test specimen two sides pressure difference, is read by intelligent digital differential manometer 8, and unit is Pascal (Pa)；
q v --- by the airflow volume speed of test specimen, can be read by high-precision gas mass flowmenter 3, unit is cubic meter
(m per second3/s)。
2. than flow resistance (R s ) calculation formula by (2) indicate, unit be every meter of pascal second (Pas/m).
(2)
In formula:
R--- material flow resistance, unit are the every cubic meter per second (Pas/m of Pascal3)；
A--- perpendicular to the test specimen cross-sectional area of airflow direction, unit is square metre (m2)。
3. the calculation formula of flow resistivity r is indicated by formula (3), unit is every square metre of pascal second (Pas/m2)。
(3)
In formula:
R s --- the ratio flow resistance of test block, unit are every meter of pascal second (Pas/m)；
d--- along the specimen thickness of airflow direction, unit rice (m).
Because
(4)；
In formula:
D3--- the diameter of test specimen cross-sectional area.
Formula (1), (2), (4) are substituted into formula (3), obtain formula (5),
Therefore,(5).
E, different airflow volume speed is adjusted, measures different pressure differences；It can be respectively by airflow volume speed control
In 0.55L/min, 0.5 L/min, 0.4 L/min, 0.3 L/min, the airflow volumes speed such as 0.1 L/min is measured different
Pressure difference calculates flow resistance value R.According to the regulation in specification, linear velocity needs to be less than 0.5 × 10-3m/s, passes through test specimen
Volume conversion, airflow volume speed maximum is no more than 0.58L/min, and different airflow volume speed is to the flow resistance of measurement
It is different, it is usually to do different airflow volume speed to be averaged therefore, show that data are more accurate effective.
F, after being measured, turn off the switch of each component, the test specimen of sound-absorbing porous material is taken from measurement pipe inside
Out, the inner wall of clean measurement pipe is put on the skin, in case next time uses.
It such as needs to measure different sound-absorbing porous material test specimens, different test specimens is put into device in turn, each
Test specimen repeats step B- step E and measures.
Embodiment 3:
A kind of measurement method of the device of flux controllable measurement acoustics flow resistance, this method is using a kind of stream described in implementation 1
The device of the controllable measurement acoustics flow resistance of amount measures the measurement method of the flow resistance characteristic of sound-absorbing porous material test specimen, when measurement,
It is carried out according to the following steps:
A, equipment presses Fig. 19 connecting components of silicone tube, after checking that each component operates normally, is detected using bubble method
The air-tightness of device: fluorocarbon oil leak detection liquid is smeared in the interface of each silica gel pipeline, starting device work, (starting includes efficient
Mute negative-pressure vacuum pump machine head power supply, high-precision gas mass flowmenter power supply, intelligent digital differential manometer power supply and accurate stream
Adjustable valve etc.), check silicone tube interface, if having bubble generation, be inspection without bubble if there is bubble then checks leak stopping
Test qualification；Qualification is examined to turn off efficient mute negative-pressure vacuum pump machine head power supply.
B, it by the test specimen for the sound-absorbing porous material to be measured made, circumferentially spreads after thin layer vaseline from guiding
Bottom of the tube, which is gently revolved, to be put into inside guide pipe, and test specimen is placed until end is concordant with guiding bottom of the tube, and handle, guide pipe are held in overturning
External application vaseline, is inserted directly into measurement pipe, until guiding bottom of the tube touches groove position, places steady.Test block with
It is mating to be oriented to pipe size, guiding bore is 1-2mm bigger than the internal diameter of card slot, and test specimen and guide pipe are added again by dimensional tolerance cooperation
The effect of upper vaseline enables test specimen to be secured firmly in guide pipe without falling in guide pipe.
C, start efficiently mute negative-pressure vacuum pump machine head 1, adjustment precision flow control valve 2 observes high-precision gas quality
Flowmeter 3, by adjustment precision flow control valve 2 control air velocity, select required for air velocity, to steady air current it
Afterwards, real-time flow rate can be read by high-precision gas mass flowmenter 3, record the pressure difference of intelligent digital differential manometer 8；
D, duplicate measurements multi-group data takes flow resistance average value, and the flow resistivity size of the material test specimen is calculated according to modular formula；Tool
Body is as follows:
Above two steps of B, C are repeated, each test specimen is averaged three times in the measurement of same flow velocity, is counted according to formula (1) ~ (3)
The flow resistance characteristic of material is calculated, and examines the sound absorbing performance of sound-absorbing material with flow resistance characteristic.
1. the calculating of flow resistance R is indicated by formula (1), unit is the every cubic meter per second (Pas/m of Pascal3)。
(1)
In formula:
P-test specimen two sides pressure difference, is read by intelligent digital differential manometer 8, and unit is Pascal (Pa)；
q v --- by the airflow volume speed of test specimen, can be read by high-precision gas mass flowmenter 3, unit is cubic meter
(m per second3/s)。
2. than flow resistance (R s ) calculation formula by (2) indicate, unit be every meter of pascal second (Pas/m).
(2)
In formula:
R--- material flow resistance, unit are the every cubic meter per second (Pas/m of Pascal3)；
A--- perpendicular to the test specimen cross-sectional area of airflow direction, unit is square metre (m2)。
3. the calculation formula of flow resistivity r is indicated by formula (3), unit is every square metre of pascal second (Pas/m2)。
(3)
In formula:
R s --- the ratio flow resistance of test block, unit are every meter of pascal second (Pas/m)；
d--- along the specimen thickness of airflow direction, unit rice (m).
Because
(4)；
In formula:
D3--- the diameter of test specimen cross-sectional area.
Formula (1), (2), (4) are substituted into formula (3), obtain formula (5),
Therefore,(5).
E, different airflow volume speed (flow velocity) is adjusted, measures different pressure differences；It can be respectively by airflow volume speed
Degree control is in 0.55L/min, 0.5 L/min, 0.4 L/min, 0.3 L/min, 0.2L/min, the airflow volumes speed such as 0.1L/min
Degree, measures different pressure differences, calculates flow resistance value R.
F, after being measured, turn off the switch of each component, grab the handle of measurement pipe guide pipe, by guide pipe directly from
Measurement pipe is taken out, and the test specimen in removal guide pipe, the vaseline put clean measurement pipe on the skin, be oriented to inside pipe wall, in case next time uses.
It such as needs to measure different sound-absorbing porous material test specimens, different test specimens is put into device in turn, each
Test specimen repeats step B- step E and measures.
Claims (10)
1. a kind of device of flux controllable measurement acoustics flow resistance, it is characterised in that: including efficient mute negative-pressure vacuum pump machine head
(1), precision flow regluating valve (2), high-precision gas mass flowmenter (3), support frame (4), measurement pipe (5) and intelligent digital are micro-
Pressure meter (8)；The vacuum pump head air inlet (11) of the efficiently mute negative-pressure vacuum pump machine head (1) passes through silicone tube (9) and essence
The adjusting valve air gate (21) of close flow control valve (2) connects, the regulating valve air inlet (22) of the precision flow regluating valve (2)
It is connect by silicone tube (9) with the flowmeter gas outlet (31) of high-precision gas mass flowmenter (3)；The measurement pipe (5) is
The top opening of strip, the closed cylinder in bottom, the bottom of the measurement pipe (5) are provided with measurement pipe measuring mouth (51) and survey
Buret air inlet (52), the inner cavity of the measurement pipe (5) be provided with protrusion card slot (53), the internal diameter of the measurement pipe (5) with
The diameter of test specimen (7) is adapted；The measurement pipe (5) is mounted on support frame (4)；The high-precision gas mass flowmenter
(3) flowmeter air inlet (32) is connect by silicone tube (9) with the measurement pipe measuring mouth (51) of measurement pipe (5)；The intelligence
Digital micromanometer (8) is provided with differential manometer measuring mouth (81) and differential manometer normal pressure mouth (82), the differential manometer measuring mouth (81) with
Measurement pipe air inlet (52) is connected by silicone tube (9), the external atmospheric pressure of the differential manometer normal pressure mouth (82).
2. the device of the flux controllable measurement acoustics flow resistance of one kind according to claim 1, it is characterised in that: the device is also
Configured with guide pipe (6), the guide pipe (6) is the cylinder of both ends open, and the inner cavity of the guide pipe (6) is for placing test specimen
(7), the diameter of the internal diameter of the guide pipe (6) and test specimen is adapted；The guide pipe (6) is movable to be placed in measurement pipe (5)
Chamber, bottom are located on card slot, and top is higher by the top of measurement pipe (5).
3. the device of the flux controllable measurement acoustics flow resistance of one kind according to claim 2, it is characterised in that: the guiding
Handle, the handle groove or handle are provided at the top of pipe (6).
4. the device of the flux controllable measurement acoustics flow resistance of one kind according to claim 1, it is characterised in that: the card slot
It is arranged at 20 ~ 100 mm of range measurement bottom of the tube.
5. the device of the flux controllable measurement acoustics flow resistance of one kind according to claim 2, it is characterised in that: the guiding
Pipe (6) by stainless steel tube material polishing form or be welded, when be placed on measurement pipe (5) it is interior when, the top of the guide pipe (6)
Portion is higher by the top at least 30mm of measurement pipe (5).
6. the device of the flux controllable measurement acoustics flow resistance of one kind according to claim 1, it is characterised in that: described mute
The power of electric vacuum pump head (1) is 3000W, air-flow can stepless time adjustment from 0 ~ 280L/max；The Miniature precision flow tune
The maximum diameter for saving valve (2) is 4mm, voltage endurance capability≤0.12Mpa；The range of the high-precision gas mass flowmenter (3): 0 ~
25L/min, precision ± (2.5+0.5FS) %, pressure≤0.12Mpa.
7. a kind of measurement method of the device of flux controllable measurement acoustics flow resistance, it is characterised in that: this method is using right
It is required that the device of the flux controllable measurement acoustics flow resistance of one kind described in 1 measures the flow resistance characteristic of sound-absorbing porous material test specimen
Measurement method when measurement, is carried out according to the following steps:
A, with silicone tube connecting components, after checking that each component operates normally, the airtight of detection device is carried out using bubble method
Property: fluorocarbon oil leak detection liquid is smeared in the interface of each silica gel pipeline, starts device work, checks silicone tube interface, if
There is bubble generation, is to examine qualification without bubble if there is bubble then checks leak stopping；Qualification is examined to turn off efficient mute negative pressure true
Empty pump machine head power supply；
B, by the test specimen for the sound-absorbing porous material to be measured made, thin layer vaseline is spread around four Mondays circle, is vertically put
Enter inside measurement pipe, until test specimen bottom touches groove position, places steady；
C, starting efficiently mute negative-pressure vacuum pump machine head, adjustment precision flow control valve observes high-precision gas mass flowmenter,
By adjustment precision Flux Valve Control air velocity, air velocity required for selecting, after steady air current, real-time streams
Speed can be read by high-precision gas mass flowmenter, record the pressure difference of intelligent digital differential manometer；
D, duplicate measurements multi-group data takes flow resistance average value, and the flow resistivity size of the material test specimen is calculated according to modular formula；
E, different airflow volume speed is adjusted, different pressure differences is measured；
F, after being measured, turn off the switch of each component, the test specimen of sound-absorbing porous material is taken out from measurement pipe inside, is put on the skin
The inner wall of clean measurement pipe, in case next time uses.
8. a kind of measurement method of the device of flux controllable measurement acoustics flow resistance, it is characterised in that: this method is using right
It is required that the device of the flux controllable measurement acoustics flow resistance of one kind described in 2 measures the flow resistance characteristic of sound-absorbing porous material test specimen
Measurement method when measurement, is carried out according to the following steps:
A, with silicone tube connecting components, after checking that each component operates normally, the airtight of detection device is carried out using bubble method
Property: fluorocarbon oil leak detection liquid is smeared in the interface of each silica gel pipeline, starts device work, checks silicone tube interface, if
There is bubble generation, is to examine qualification without bubble if there is bubble then checks leak stopping；Qualification is examined to turn off efficient mute negative pressure true
Empty pump machine head power supply；
B, it by the test specimen for the sound-absorbing porous material to be measured made, circumferentially spreads after thin layer vaseline from guide pipe bottom
Portion is put into inside guide pipe, and test specimen is placed until end is concordant with guiding bottom of the tube, and handle, guide pipe external application are held in overturning
Vaseline is inserted directly into measurement pipe, until guiding bottom of the tube touches groove position, is placed steady；
C, starting efficiently mute negative-pressure vacuum pump machine head, adjustment precision flow control valve observes high-precision gas mass flowmenter,
By adjustment precision Flux Valve Control air velocity, air velocity required for selecting, after steady air current, real-time streams
Speed can be read by high-precision gas mass flowmenter, record the pressure difference of intelligent digital differential manometer；
D, duplicate measurements multi-group data is averaged, and the flow resistivity size of the material test specimen is calculated according to modular formula；
E, different air velocities is adjusted, different pressure differences is measured；
F, after being measured, turn off the switch of each component, the handle of measurement pipe guide pipe is grabbed, by guide pipe directly from measurement
Pipe takes out, and the test specimen in removal guide pipe, the vaseline put clean measurement pipe on the skin, be oriented to inside pipe wall, in case next time uses.
9. the measurement method of the device of the flux controllable measurement acoustics flow resistance of one kind according to claim 7 or 8, feature
It is: the step E, different air velocities is adjusted, respectively by airflow volume speed control in 0.55L/min, 0.5 L/
Min, 0.4 L/min, 0.3 L/min, 0.1 L/min airflow volume speed measure different pressure differences, calculate flow resistance value.
10. the measurement method of the device of the flux controllable measurement acoustics flow resistance of one kind according to claim 7 or 8, special
Sign is: repeating step B- step E, can measure different sound-absorbing porous material test specimens.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117804994A (en) * | 2023-12-28 | 2024-04-02 | 广东鼎诺科技音频有限公司 | Sheet material air permeability flow test system, method, equipment and storage medium |
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