CN208171788U - A kind of sound-absorbing material flow resistance measuring instrument of temperature-controllable - Google Patents
A kind of sound-absorbing material flow resistance measuring instrument of temperature-controllable Download PDFInfo
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- CN208171788U CN208171788U CN201820517929.5U CN201820517929U CN208171788U CN 208171788 U CN208171788 U CN 208171788U CN 201820517929 U CN201820517929 U CN 201820517929U CN 208171788 U CN208171788 U CN 208171788U
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Abstract
The utility model discloses a kind of sound-absorbing material flow resistance measuring instrument of temperature-controllable, test specimen cylinder is upright column cylinder, has been fitted heating coil with test specimen medial wall of the tube；Turbogrid plates are installed using the axial gap between lower section heating coil and upper section heating coil, test specimen is placed on Turbogrid plates, and test specimen cylinder is divided into lower barrel chamber and upper barrel chamber；Gas source external hole is set in the bottom center of column cylinder, and is connected by gas source pipeline with aspiration pump, pressure differential detection unit is set for lower barrel chamber and upper barrel chamber；Piston is set in the upper barrel chamber of test specimen cylinder, carries out specimen thickness detection using piston is mobile, infrared radiation thermometer is set above test specimen cylinder, for detecting to test specimen temperature.The utility model can obtain the flow resistance value of test specimen at a set temperature, provide foundation for concrete application of the sound-absorbing material in different temperatures environment.
Description
Technical field
The utility model relates to acoustic test equipment technical field, more specifically a kind of sound-absorbing material flow resistance measurement
Instrument.
Background technique
There is the hole being largely connected to, when sound wave enters material internal propagation, due to air inside sound-absorbing porous material
The heat transfer of viscosity and material, enables sound to be constantly lost, and plays the role of sound absorption.Flow resistance is that sound-absorbing porous material is joined substantially
One of number is to determine material sound absorbing performance key factor.Therefore, in the basic research of acoustical material and the development of sound absorbing products
In, the measurement of flow resistance is important.Flow resistance is defined as the draught head of upper and lower two sides and the ratio between the airflow volume speed for passing through test specimen.
" flow resistance instrument adopting water tank method " (publication number disclosed in Chinese patent literature：CN 201319029, publication date：In September, 2009
30 days), steady air flow is obtained using adopting water tank method, although this method can guarantee to flow through the stability of the air-flow of sample, energy
Enough flow resistance progress to sound-absorbing porous material are effectively measuring, but there are the problems such as bulky, inconvenient for use, not practical enough.
" a kind of instrument for air flow resistance measurement " (publication number disclosed in Chinese patent literature：CN 104458200, publication date：
On March 25th, 2015), although this method is intuitive, economical, portable, sample can be lacked reliable and effective with and without loss measurement
Support and positioning, have certain influence to the accuracy of measurement result." a kind of sound-absorbing porous material disclosed in Chinese patent literature
Flow resistance measuring instrument " (publication number：CN 106918442, publication date：On July 4th, 2017), it, can although the technology structural volume is small
Sample is reliably and efficiently supported and be positioned, but because test specimen cylinder front and back end internal diameter slightly has difference, so that air-flow disengaging examination
The sectional area of sample differs, and then causes measurement result not accurate enough.
All it is in the prior art to carry out at normal temperature about the measurement of flow resistance, does not there is the influence for considering temperature convection resistance.But
It is that when temperature changes, flow resistance can also change material therewith, and this phenomenon is particularly evident at high temperature, in fact, greatly
The application temperature of most sound-absorbing materials is quite high, for example normal domestic aero-engine cabin surface temperature is up to 600 DEG C, existing
Measured under room temperature in technology acquisition material flow resistance and sound-absorbing material practical application in flow resistance there are larger difference, this measurements
Data can not accurately reflect the sound absorbing performance of material.
Utility model content
The utility model is to provide a kind of sound-absorbing material of temperature-controllable to avoid above-mentioned deficiency of the prior art
Flow resistance measuring instrument obtains the flow resistance value of test specimen at a set temperature by temperature control and measurement, is sound-absorbing material in not equality of temperature
The concrete application spent in environment provides foundation, and also relationship provides safeguard between the flow resistance and temperature to study sound-absorbing material.
The utility model adopts the following technical scheme that in order to solve the technical problem
The sound-absorbing material flow resistance measuring instrument of the utility model temperature-controllable is structurally characterized in that：
Be arranged test specimen cylinder be upright column cylinder, the bottom end closure of column cylinder, top opening on end cap is installed, trying
In part cylinder, heating coil has been fitted with the inner sidewall of test specimen cylinder；The heating coil subsection setup is lower section heating coil and upper
Section heating coil forms annular groove using the axial gap between lower section heating coil and upper section heating coil, and Turbogrid plates are mounted on institute
It states in annular groove, test specimen is placed on the Turbogrid plates, and test specimen cylinder is made to be divided into lower barrel chamber and upper barrel chamber by test specimen plate；
Gas source external hole is set in the bottom center of the column cylinder, the gas source external hole passes through gas source pipeline and pumping
Pump is connected, and gas flow sensor is arranged on the gas source pipe road；For the lower barrel chamber and the setting of upper barrel chamber in test specimen cylinder
Pressure differential detection unit forms two drive tests being connected to the lower barrel chamber of test specimen cylinder and upper barrel chamber including differential manometer and respectively in differential manometer
Pressure pipe road；The pressure differential detection unit is set as two sets on the radial symmetric position of test specimen cylinder；
Piston is set in the upper barrel chamber of the test specimen cylinder, and the rod end of piston rod is protruded out through end cap, convex in the piston rod
The rod end stretched is provided with thickness indicator, using movement of the piston in the upper barrel chamber of test specimen cylinder, and passes through thickness indicator pair
Specimen thickness is detected；
The test specimen cylinder top, be in radial symmetric position on two groups of infrared radiation thermometers are set, for test specimen
Temperature is detected.
The design feature of the sound-absorbing material flow resistance measuring instrument of the utility model temperature-controllable is lain also in：In upper barrel chamber and lower cylinder
Pressure tap is opened up on the side wall of chamber, is upper barrel chamber pressure tap and lower barrel chamber pressure tap respectively, and the upper barrel chamber pressure tap is in tightly
At the height and position for sticking the top of section heating coil, lower barrel chamber pressure tap is in the height and position for being close to the bottom end of lower section heating coil
Place；The two-way pressure-measuring pipe road of differential manometer is corresponded through upper barrel chamber pressure tap and lower barrel chamber pressure tap and upper barrel chamber and lower barrel chamber
It is connected.
The design feature of the sound-absorbing material flow resistance measuring instrument of the utility model temperature-controllable is lain also in：The lower section heating coil
It is identical with upper section heating coil internal diameter, and thickness is equal；The axial length of the upper section heating coil is not less than twice of specimen thickness；
The axial length of lower section heating coil is not less than the thickness of test specimen.
The design feature of the sound-absorbing material flow resistance measuring instrument of the utility model temperature-controllable is lain also in：The heating coil uses
Ceramic heat circle, it is high temperature resistant instrument that the flow resistance measuring instrument, which is arranged, including the outer wall in the test specimen cylinder and pressure-measuring pipe road
Upper setting insulating layer, can be smearing insulating mold coating, and tolerable temperature is not less than 850 DEG C.
The design feature of the sound-absorbing material flow resistance measuring instrument of the utility model temperature-controllable is lain also in：The Turbogrid plates are equal
The even orifice plate that through-hole is distributed with, the through-hole are the rectangular openings that bond length is not less than 10mm, and the punching rate on Turbogrid plates is not small
In 80%；There are enough distances between Turbogrid plates and the cylinder bottom of test specimen cylinder so that air-flow is steady, it is described it is enough away from
From referring to not small specimen diameter, and it is not less than the distance value of specimen thickness.
The design feature of the sound-absorbing material flow resistance measuring instrument of the utility model temperature-controllable is lain also in：Following performance ginseng is set
Number：
The minimum linear velocity of the aspiration pump is 0.5 × 10-3m/s；
The differential manometer most low energy detects that the pressure values of 0.1Pa, differential manometer precision are at least ± 5%；
The flowmeter most low energy detection 0.5 × 10-3The flow value of m/s, flowmeter accuracy are at least ± 5%；
The temperature measurer highest measurement temperature is not less than 850 DEG C, and temperature measurer precision is at least ± 5%.
Compared with the prior art, the utility model has the beneficial effect that：
1, the utility model introduces heating coil, analog material actual work temperature, and detection obtains material in real work
At a temperature of flow resistance value, more accurately reflect practical application in material sound absorbing performance, have important practical application valence
Value；
2, built-in heating coil is arranged in the utility model, may be implemented to be rapidly heated by temperature control；In its measurement process
Gas is small, steady air current, is conducive to the raising of measurement accuracy；
3, double temperature probes are configured in the utility model, it is whether equal using two groups of temperature probe detection sound-absorbing material temperature
It is even；And can be mutually authenticated with the measurement data of two groups of temperature probes, guarantee the reliability of detection data；By by two groups
The measurement data of temperature probe is averaged, and can improve measurement accuracy to a certain extent；
4, double pressure differences measurement connectors are arranged for test specimen cylinder in the utility model, and correspond separate configurations differential manometer, and two
The measurement data of a differential manometer is mutually authenticated, and guarantees the reliability of detection data；By by the measurement data of two differential manometers into
Row is average, can improve measurement accuracy to a certain extent.
Detailed description of the invention
Fig. 1 is the utility model flow resistance instrument schematic diagram of internal structure.
Figure label：1 test specimen cylinder；2 end caps；3 upper section heating coils；4 lower section heating coils；5 Turbogrid plates；6 bracing rings；7 pumpings
Pump；8 differential manometers；9 gas flow sensors；10 piston rods；11 infrared radiation thermometers；12 data collectors；13 computers；14 temperature controls
Device.
Specific embodiment
Referring to Fig. 1, the structure type of the sound-absorbing material flow resistance measuring instrument of temperature-controllable is in the present embodiment：
Be arranged test specimen cylinder 1 be upright column cylinder, the bottom end closure of column cylinder, top opening on end cap 2 is installed, hold
2 one side of lid plays the role of heat preservation, on the other hand can reduce gas to a certain extent；In test specimen cylinder 1, with test specimen
The inner sidewall of cylinder 1 has been fitted heating coil；Heating coil subsection setup is lower section heating coil 4 and upper section heating coil 3, under utilization
Axial gap between section heating coil 4 and upper section heating coil 3 forms annular groove, and Turbogrid plates 5 are mounted in annular groove, test specimen
It is placed on Turbogrid plates 5, test specimen cylinder 1 is made to be divided into lower barrel chamber and upper barrel chamber by test specimen plate.
Gas source external hole is set in the bottom center of column cylinder, gas source external hole is connected by gas source pipeline with aspiration pump 7
It is logical, gas flow sensor 9 is set on gas source pipe road；For the lower barrel chamber and upper barrel chamber setting pressure differential detection in test specimen cylinder 1
Unit forms the two-way pressure-measuring pipe being connected to the lower barrel chamber of test specimen cylinder 1 and upper barrel chamber including differential manometer 8 and respectively in differential manometer 8
Road；Pressure differential detection unit is set as two sets on the radial symmetric position of test specimen cylinder 1.
Piston is set in the upper barrel chamber of test specimen cylinder 1, and the rod end of piston rod 10 is protruded out through end cap 2, protruded out in piston rod
Rod end is provided with thickness indicator, carries out Thickness sensitivity to test specimen using movement of the piston in the upper barrel chamber of test specimen cylinder 1, and lead to
It crosses thickness indicator and reads specimen thickness detected value, on the one hand piston is used to measure specimen thickness, on the other hand can be used for smooth
Test specimen；Test specimen cylinder 1 top, be in radial symmetric position on two groups of infrared radiation thermometers 11 are set, for test specimen temperature
It is detected.
Corresponding structure setting also includes in the present embodiment：
Column cylinder can be cylindrical drum, and being also possible to cross sectional shape is rectangular or Else Rule polygon column cylinder.
Pressure tap is opened up on the side wall of upper barrel chamber and lower barrel chamber, is upper barrel chamber pressure tap and lower barrel chamber pressure tap respectively,
At upper barrel chamber pressure tap at the height and position on top for being close to upper section heating coil, lower barrel chamber pressure tap, which is in, is close to lower section heating
At the height and position of the bottom end of circle；The two-way pressure-measuring pipe road of differential manometer 8 is corresponded to be surveyed by upper barrel chamber pressure tap and lower barrel chamber
Pressure mouth is connected with upper barrel chamber and lower barrel chamber.
Lower section heating coil 4 is identical with 3 internal diameter of upper section heating coil, and thickness is equal；The axial length of upper section heating coil 3 is not small
In twice of specimen thickness；The axial length of lower section heating coil 4 is not less than the thickness of test specimen.
Upper section heating coil 3 and lower section heating coil 4 are all made of ceramic heat circle, and setting flow resistance measuring instrument is high temperature resistant instrument,
Including insulating layer is arranged on the outer wall on test specimen cylinder 1 and pressure-measuring pipe road, heat preservation can be formed by smearing insulating mold coating
Layer, tolerable temperature are not less than 850 DEG C.Insulating layer is conducive to the raising of heating rate, is conducive to the holding of set temperature, also reduces
Heat loss realizes energy conservation.
Turbogrid plates 5 are the orifice plate for being evenly distributed with through-hole, and through-hole is the rectangular opening that bond length is not less than 10mm, Turbogrid plates
Punching rate on 5 is not less than 80%；There are enough distances between Turbogrid plates 5 and the cylinder bottom of test specimen cylinder 1, so that air-flow
Steadily, enough distances refer to not small specimen diameter, and are not less than the distance value of specimen thickness；It is to add in specific implementation in lower section
Bracing ring 6 is arranged in the bottom of gas ket 4, guarantees the distance between the cylinder bottom of Turbogrid plates 5 and test specimen cylinder 1, support using bracing ring 6
The internal diameter of circle 6 is equal with the internal diameter of lower section heating coil 4.
Corresponding performance parameter, which is arranged, is：The minimum linear velocity of aspiration pump 7 is 0.5 × 10-3m/s；Differential manometer is minimum
It can detect that the pressure values of 0.1Pa, differential manometer precision are at least ± 5%；Flowmeter most low energy detection 0.5 × 10-3The flow of m/s
Value, flowmeter accuracy are at least ± 5%；Temperature measurer highest measurement temperature is not less than 850 DEG C, and temperature measurer precision is at least ± 5%.
Corresponding dimensional parameters, which are arranged, is：The internal diameter of test specimen cylinder is 115mm, outer diameter 170mm, is highly 300mm, grid
Plate with a thickness of 5mm；The height of supporting block is not less than 60mm；Heating coil internal diameter is 100mm, outer diameter 115mm, upper section heating
Enclose length 140mm, lower section heating coil length 30mm；The heater of heating coil is that circle silk twines and scratches into spring like and penetrate ceramic strip circle system
At outer cover is stainless steel；Gas source external hole aperture positioned at the bottom center of column cylinder is 23mm；Upper barrel chamber pressure tap and lower cylinder
Chamber pressure tap is circular through hole, aperture 8.5mm；To cooperate infrared radiation thermometer, is taken a little convenient for thermometric, thermometric is set on end cap
Through-hole, aperture 30mm.
Computer control system, including data collector 12, computer 13 and temperature control can be set for the utility model
Device 14, temperature controller 14 receive the instruction from computer, realize the temperature automatic control to test specimen.
The flow resistance of sound-absorbing material increases with the increase of linear velocity in a certain range, and pumping is required in the present embodiment
Pump can provide sufficiently low line flow velocity, and minimum rate of accumulation flow velocity will reach 0.5 × 10-3M/s, it is ensured that flow resistance is not by the shadow of air velocity
It rings；The detection data of two sets of pressure difference detection units can be used for verifying each other, and measurement accuracy can be improved by averaged.
Likewise, two groups of infrared radiation thermometers can be used for verifying each other, its average value is sought, and will appreciate that the temperature of sound-absorbing material is equal
Even situation keeps temperature of the sound-absorbing material at center and peripheral almost the same by extending heating time；If test specimen be it is soft and
Compressible sound-absorbing material, such as foamed plastics should be avoided and form gap at test specimen edge；If test specimen is hard test specimen, can
The position that gap can be formed is closed using greasy filth etc., guarantees air-tightness.
The measuring principle of the utility model is：Test specimen is heated and maintained to the temperature of setting using heating coil；Utilize pumping
Air pump controls one way stable air-flow by the test specimen in test specimen cylinder, measures the pressure difference caused by test specimen upper and lower end faces.
Flow resistance measuring instrument realizes that flow resistance measures as follows in the present embodiment：
Test specimen is placed on test specimen cylinder inside grid by step 1, guarantees the air-tightness between test specimen and test specimen barrel, benefit
Specimen thickness d is measured using thickness measurement equipment after test specimen naturally relaxation with the smooth test specimen of piston；
Step 2, heating coil are devoted oneself to work, and test specimen is heated and maintained at set temperature until test terminates；
Step 3 opens aspiration pump, as linear velocity qvStablize 0.5 × 10-3When m/s, the indicating value Δ of differential manometer is recorded
P, then flow measurement resistance R be：R=Δ p/qv。
Claims (6)
1. a kind of sound-absorbing material flow resistance measuring instrument of temperature-controllable, it is characterized in that：
Be arranged test specimen cylinder (1) be upright column cylinder, the bottom end closure of column cylinder, top opening on end cap (2) are installed,
In test specimen cylinder (1), heating coil has been fitted with the inner sidewall of test specimen cylinder (1)；The heating coil subsection setup adds for lower section
Gas ket (4) and upper section heating coil (3) form annular using the axial gap between lower section heating coil (4) and upper section heating coil (3)
Groove, Turbogrid plates (5) are mounted in the annular groove, and test specimen is placed on the Turbogrid plates (5), make test specimen cylinder (1) by trying
Part plate is divided into lower barrel chamber and upper barrel chamber；
Gas source external hole is set in the bottom center of the column cylinder, the gas source external hole passes through gas source pipeline and aspiration pump
(7) it is connected, gas flow sensor (9) is set on the gas source pipe road；For in test specimen cylinder (1) lower barrel chamber and upper cylinder
Pressure differential detection unit is arranged in chamber, including differential manometer (8) and respectively in the lower barrel chamber and upper barrel chamber of differential manometer (8) and test specimen cylinder (1)
Form the two-way pressure-measuring pipe road of connection；The pressure differential detection unit is set as two sets on the radial symmetric position of test specimen cylinder (1)；
Piston is set in the upper barrel chamber of the test specimen cylinder (1), and the rod end of piston rod is protruded out through end cap (2), in the piston rod
The rod end protruded out is provided with thickness indicator, indicates using movement of the piston in the upper barrel chamber of test specimen cylinder (1), and by thickness
Device detects specimen thickness；
The test specimen cylinder (1) top, be in radial symmetric position on two groups of infrared radiation thermometers are set, for test specimen temperature
Degree is detected.
2. the sound-absorbing material flow resistance measuring instrument of temperature-controllable according to claim 1, it is characterized in that：In upper barrel chamber and lower cylinder
Pressure tap is opened up on the side wall of chamber, is upper barrel chamber pressure tap and lower barrel chamber pressure tap respectively, and the upper barrel chamber pressure tap is in tightly
At the height and position for sticking the top of section heating coil, lower barrel chamber pressure tap is in the height and position for being close to the bottom end of lower section heating coil
Place；The two-way pressure-measuring pipe road of differential manometer (8) correspond by upper barrel chamber pressure tap and lower barrel chamber pressure tap and upper barrel chamber and under
Barrel chamber is connected.
3. the sound-absorbing material flow resistance measuring instrument of temperature-controllable according to claim 1, it is characterized in that：The lower section heating coil
(4) identical with upper section heating coil (3) internal diameter, and thickness is equal；The axial length of the upper section heating coil (3) is thick not less than test specimen
Twice of degree；The axial length of lower section heating coil (4) is not less than the thickness of test specimen.
4. the sound-absorbing material flow resistance measuring instrument of temperature-controllable according to claim 1, it is characterized in that：The heating coil uses
Ceramic heat circle, it is high temperature resistant instrument that the flow resistance measuring instrument, which is arranged, is included in the outer of the test specimen cylinder (1) and pressure-measuring pipe road
Insulating layer is set on wall, can be smearing insulating mold coating, tolerable temperature is not less than 850 DEG C.
5. the sound-absorbing material flow resistance measuring instrument of temperature-controllable according to claim 1, it is characterized in that：The Turbogrid plates (5)
For the orifice plate for being evenly distributed with through-hole, the through-hole is the rectangular opening that bond length is not less than 10mm, the perforation on Turbogrid plates (5)
Rate is not less than 80%；There are enough distances between Turbogrid plates (5) and the cylinder bottom of test specimen cylinder (1), so that air-flow is steady,
Enough distances refer to not small specimen diameter, and are not less than the distance value of specimen thickness.
6. the sound-absorbing material flow resistance measuring instrument of temperature-controllable according to claim 1, it is characterized in that：Following performance ginseng is set
Number：
The minimum linear velocity of the aspiration pump is 0.5 × 10-3m/s；
The differential manometer most low energy detects that the pressure values of 0.1Pa, differential manometer precision are at least ± 5%；
The temperature measurer highest measurement temperature is not less than 850 DEG C, and temperature measurer precision is at least ± 5%；
Flowmeter most low energy detection 0.5 × 10-3The flow value of m/s, flowmeter accuracy are at least ± 5%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820517929.5U CN208171788U (en) | 2018-04-12 | 2018-04-12 | A kind of sound-absorbing material flow resistance measuring instrument of temperature-controllable |
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| CN201820517929.5U CN208171788U (en) | 2018-04-12 | 2018-04-12 | A kind of sound-absorbing material flow resistance measuring instrument of temperature-controllable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489855A (en) * | 2018-04-12 | 2018-09-04 | 合肥工业大学 | A kind of sound-absorbing material flow resistance measuring instrument of temperature-controllable |
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2018
- 2018-04-12 CN CN201820517929.5U patent/CN208171788U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489855A (en) * | 2018-04-12 | 2018-09-04 | 合肥工业大学 | A kind of sound-absorbing material flow resistance measuring instrument of temperature-controllable |
| CN108489855B (en) * | 2018-04-12 | 2023-12-05 | 合肥工业大学 | Temperature-controllable sound-absorbing material flow resistance measuring instrument |
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