CN106197896A - A kind of tube or inner liner air tightness detecting apparatus and determination of gas tightness method - Google Patents
A kind of tube or inner liner air tightness detecting apparatus and determination of gas tightness method Download PDFInfo
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- CN106197896A CN106197896A CN201610654441.2A CN201610654441A CN106197896A CN 106197896 A CN106197896 A CN 106197896A CN 201610654441 A CN201610654441 A CN 201610654441A CN 106197896 A CN106197896 A CN 106197896A
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- 239000002184 metals Substances 0.000 claims description 6
- 241001081830 Degeneriaceae Species 0.000 claims description 3
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- 238000005245 sintering Methods 0.000 claims description 2
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- 238000000034 methods Methods 0.000 abstract description 5
- 238000001764 infiltration Methods 0.000 description 6
- 238000004088 simulation Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 229920001971 elastomers Polymers 0.000 description 3
- 230000001131 transforming Effects 0.000 description 3
- VHOQXEIFYTTXJU-UHFFFAOYSA-N 2-methylbuta-1,3-diene;2-methylprop-1-ene Chemical compound 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CC(C)=C.CC(=C)C=C VHOQXEIFYTTXJU-UHFFFAOYSA-N 0.000 description 2
- 281000119710 All-Steel companies 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 210000004247 Hand Anatomy 0.000 description 1
- 241000287181 Sturnus vulgaris Species 0.000 description 1
- 210000001138 Tears Anatomy 0.000 description 1
- 229920002725 Thermoplastic elastomer Polymers 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Classifications
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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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2846—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for tubes
-
- 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
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
-
- 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
-
- 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
- G01N2015/086—Investigating permeability, pore-volume, or surface area of porous materials of films, membranes or pellicules
Abstract
Description
Technical field
The invention belongs to tyre performance detection technique field, particularly to a kind of airtight for tube or inner liner Property determinator and measure tube or the bubble-tight method of inner liner with this device.
Background technology
Tire is generally made up of cover tire, the inner tube of a tyre, rim strip three part.Also have and need not the inner tube of a tyre, inside its carcass, have one layer The rubber layer (being also inner liner or inner liner) that air-tightness is good, and special wheel rim need to be joined.The structure of countries in the world tire, all Develop to tubeless, meridian structure, flat (ratio of tire section Gao Yukuan is little) and light-weighted direction.
The automobile tire inner tube of a tyre or inner liner mostly use the epoxy glue of butyl rubber or butyl rubber and other rubber at present. For the inner tube of a tyre or the elastomeric material of inner liner, in addition to requiring to have the stretch-proof of high intensity, tear resistance, also requirement has good Good air-tightness, to ensure that automobile tire is used without inflation for a long time.
One automobile tire, after sufficient gas, uses 6-12 month, it may appear that tire pressure in various degree declines, to wheel Tire checks, the most also will not be found to have leakage point.Such tiny leakage, generally not carcass, valve receive Damage, but owing to the infiltration of intact tire material gas own is caused, and the factor affecting gas infiltration is main Have:
(1) diffusion coefficient affecting material of tire material itself is the biggest, and gas infiltration is the easiest；
(2) temperature to affect temperature the highest, gas molecule motion is the most violent, and gas infiltration is the easiest；
(3) fill in tire gas to affect gas molecule diameter the least, gas infiltration is the easiest；
(4) in tire the blowing pressure affect tire in the blowing pressure the highest, the pressure reduction inside and outside tire is the biggest, and gas infiltration is more Easily.
For half steel tire, the gas pressure in tire is generally 0.2-0.25MPa, for all steel tire, the gas in tire Pressure is generally 0.7-0.8MPa.And tire is during running at high speed, internal temperature can steeply rise, limiting temperature up to 120 DEG C, at a temperature of this, half steel tire air pressure inside is up to 0.264-0.33MPa, and all steel tire air pressure inside is up to 0.923- 1.055MPa.I.e. during tire is actually used, at a temperature of different the blowing pressure, varying environments, tube or inner liner Air-tightness the most different.
Evaluate tube at present or the bubble-tight quality of inner liner is mainly by gas permeation amount, gas transmission coefficient (GB/T 1038-2000) two indices is weighed.
Gas permeation amount, refers under steady temperature and unit pressure difference, when stably passing through, through examination in the unit interval The volume of the gas of sample unit are.Representing with the bulking value under standard temperature and pressure (STP), unit is: cm3/(m2·d·Pa)。
Gas transmission coefficient, refers under steady temperature and unit pressure difference, when stably passing through, passes through in the unit interval Sample unit thickness, the volume of gas of unit are.Representing with the bulking value under standard temperature and pressure (STP), unit is: cm3· cm/(cm2·s·Pa)。
Gas permeation amount Qg[cm3/(m2D Pa)] calculate by formula (1):
In formula: QgThe gas permeation amount of material, cm3/(m2·d·Pa)；
Δ p/ Δ t stably through time, the arithmetic mean of instantaneous value of low pressure chamber gas pressure change, Pa/ in the unit interval h；
V low pressure chamber volume, cm3；
The test area of S sample, m2；
T test temperature, K；
p1-p2The pressure reduction of sample both sides, Pa；
T0, p0Temperature (273.15K) under standard state and pressure (1.0133 × 105Pa)。
Gas transmission coefficient Pg[cm3·cm/(cm2S Pa)] calculate by formula (2):
In formula: PgThe gas permeation rate of material, cm3·cm/(cm2·s·Pa)；
Δ p/ Δ t stably through time, the arithmetic mean of instantaneous value of low pressure chamber gas pressure change, Pa/ in the unit interval s；
T test temperature, K；
D tests thickness, cm；
At present in industry, for the bubble-tight test method of tube or inner liner it is: whole finished product tire is filled with rule The gas of constant-pressure, and connect Pressure gauge, it is positioned in the environment that a temperature keeps constant and stands about 7 days, treat finished product tire After internal and external temperature reaches balance, start pressure changing in shake rails.Test period the most at least continues one month, many Up to one years.The method of testing of this globality in addition to the way by observation Pressure gauge pressure drop, does not also have it at present His preferable implementation.This method of testing precision length low, time-consuming, cost are high, operate very inconvenient.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art with not enough, the primary and foremost purpose of the present invention be to provide a kind of new for Tube or the air tightness detecting apparatus of inner liner, it can improve tube or the efficiency of inner liner air tightness test and standard Really property, realizes GB/T 7755-2003 vulcanite or the mensuration of thermoplastic elastomer breathability on this device.
Another object of the present invention is that offer utilizes said apparatus to measure tube or the bubble-tight method of inner liner.Should Method samples on measured material, is installed between high pressure chest assembly and low pressure chamber assembly, is formed airtight respectively in sample both sides High pressure cavity volume and low pressure cavity volume, make sample both sides keep a constant pressure reduction, measure low pressure-volume after gas penetrates sample Cavity pressure over time, calculates gas permeation amount and gas transmission coefficient etc. by GB/T 1038-2000 and directly affects The parameter of air-tightness.
The purpose of the present invention is realized by following proposal:
A kind of tube or the air tightness detecting apparatus of inner liner, including high pressure chest assembly, low pressure chamber assembly and use In tested sample being fixed on the fixation kit between high pressure chest assembly and low pressure chamber assembly, formed airtight in tested sample both sides High pressure cavity volume and low pressure cavity volume, high pressure cavity volume is connected with high-voltage power supply, high voltage control unit and high-pressure detection unit respectively, low pressure Cavity volume is connected with low pressure source, low voltage control unit and low voltage detecting unit respectively, high voltage control unit, low voltage control unit, temperature Degree control unit is respectively by correspondingly high-pressure detection unit, low voltage detecting unit and temperature detecting unit and label Rhizoma Coptidis Connecing, high pressure chest assembly and low pressure chamber assembly are connected with temperature control unit and temperature detecting unit respectively.
Described high pressure chest assembly includes high pressure chest lid, high-pressure chamber and the high pressure chest heater being placed in one, high Pressure chamber heater is connected with temperature control unit and temperature detecting unit respectively.
Described low pressure chamber assembly includes low pressure chamber lid, low pressure volumes and the low pressure chamber heater being placed in one, low Pressure chamber heater is connected with temperature control unit and temperature detecting unit respectively.
Described high pressure chest heater includes high pressure chest heating plate, high pressure chest heat-insulation layer and high pressure chest temperature sensor, High pressure chest temperature sensor is inserted high pressure chest heating plate from the side of high-pressure chamber through high pressure chest heat-insulation layer, high pressure chest temperature Sensor is connected with temperature detecting unit；Described low pressure chamber heater include low pressure chamber heating plate, low pressure chamber heat-insulation layer and Low pressure chamber temperature sensor, low pressure chamber temperature sensor is inserted low pressure chamber from the side of low pressure volumes through low pressure chamber heat-insulation layer and is added In hot plate, low pressure chamber temperature sensor is connected with temperature detecting unit；
Preferably, high pressure chest heating plate is identical with the structure of low pressure chamber heating plate, and inside is all arranged in parallel two heating rods, Heating rod and temperature control unit connect.
Described fixation kit can be hold down gag or automatic supporting device.
Described hold down gag includes lead, handwheel, screw rod and claw, high pressure chest assembly by lead, screw rod with Hold down gag is connected, and low pressure chamber assembly is fixed by screws in identical platform with holding down assembly, and holding down assembly will by handwheel Claw firmly buckles in the oblique groove above low pressure volumes, makes high pressure chest assembly and low pressure chamber assembly compress tested sample, from And airtight high pressure cavity volume and low pressure cavity volume is formed in sample both sides.Described high pressure cavity volume and low pressure cavity volume diameter dimension phase With.
Described automatic supporting device includes power source (such as cylinder, electricity cylinder etc.) and support, and the take-off lever of power source is with high Pressure chamber assembly connects, and support and low pressure chamber assembly are fixed in identical platform, rely on the pressure of power source, by high pressure chest assembly Firmly it is pressed in low pressure chamber assembly and tested sample, thus forms airtight high pressure cavity volume and low pressure in tested sample both sides Cavity volume.
Preferably, described fixation kit is hold down gag.
Described high-voltage power supply is gases at high pressure, for increasing high pressure chest volume, makes the high pressure that long leak test causes Chamber pressure loss reduction, can be connected high pressure cavity volume with test pressure-sustaining gas air accumulator.
Described low pressure source is ambient atmosphere, and low pressure cavity volume passes through high sensitivity normally closed solenoid valve and exhaust shutter with low Potential source connects.Low pressure chamber pressure higher limit (normal atmosphere+100Pa) is set, exhaust shutter is adjusted to minimum exhaust stream Amount, when low voltage detecting unit detects and causes low pressure chamber pressure value to exceed setting higher limit because of long leak test, The break-make being controlled high sensitivity normally closed solenoid valve by low voltage control unit realizes automatic aerofluxus, recovers normal atmosphere, thus Simulation tire operating mode in actual use.
Also including sample support block in described low pressure cavity volume, sample support block is by having certain hardness and good saturating The material of gas prepares, and diameter is more smaller than low pressure cavity volume, and height is identical with the low pressure cavity volume degree of depth, plays a supporting role sample 2, To resist gases at high pressure load, sample 2 is made not produce significantly deformation, it is ensured that vapor permeation area is constant.
Preferably, described sample support block is prepared by sintering metal powder, micropore metal or binding metal granule.
Described low pressure volumes is provided above with two circular grooves, is used for placing O RunddichtringO, it is ensured that tested sample And the sealing between low pressure cavity volume, the diameter of O RunddichtringO is less than tested sample.
It is connected with gases at high pressure by high pressure cavity volume and low pressure cavity volume is connected with ambient atmosphere and simulates tire and make actual Operating mode during with, the pressure limit in high pressure chest can be normal atmospheric pressure～2.0MPa.
The described unit of record automatically carries data handling system.
One utilizes said apparatus to measure tube or the bubble-tight method of inner liner, and this device can be in both modes Measure tube or inner liner air-tightness, comprise the following steps respectively:
Under the pattern of constant temperature and constant-pressure drop:
(1) sample on measured material, testing wheel fetus in fetus or inner liner sample thickness, then sample is placed in high pressure chest Between assembly and low pressure chamber assembly, high pressure chest assembly and low pressure chamber assembly is made to fix and compress tested sample with fixation kit, Tested sample both sides form airtight high pressure cavity volume and low pressure cavity volume；
(2) being connected with ambient atmosphere by low pressure cavity volume, making low pressure cavity volume initial pressure is normal atmosphere, then keeps close Close；
(3) in high pressure cavity volume and constant-pressure gas storage tank, it is filled with the gases at high pressure of setting pressure；
(4) control high pressure chest heater and low pressure chamber heater by temperature control unit, keep high pressure chest assembly With the temperature constant in low pressure chamber assembly, kept the pressure reduction of high and low pressure cavity volume by high voltage control unit and low voltage control unit Constant；
(5) air tightness test: by the low voltage detecting unit being connected with low pressure cavity volume with automatically record unit, real time record The pressure changing of low pressure cavity volume, draws the gas permeation curve of sample, thus calculates gas permeation amount and gas permeation Coefficient；
Under the pattern of transformation difference that relents:
(1) sample on measured material, testing wheel fetus in fetus or inner liner sample thickness, then sample is placed in high pressure chest Between assembly and low pressure chamber assembly, high pressure chest assembly and low pressure chamber assembly is made to fix and compress tested sample with fixation kit, Tested sample both sides form airtight high pressure cavity volume and low pressure cavity volume；
(2) being connected with ambient atmosphere by low pressure cavity volume, making low pressure cavity volume initial pressure is normal atmosphere, then keeps close Close；
(3) in high pressure cavity volume and constant-pressure gas storage tank, it is filled with the gases at high pressure of setting pressure under room temperature state；
(4) by temperature control unit and temperature detecting unit, high pressure chest heater and low pressure chamber heater are controlled High pressure chest assembly and low pressure chamber assembly are heated to design temperature and keep constant, after balance, by low pressure cavity volume with air even Logical, make low pressure cavity volume internal gas pressure keep sealing after being down to normal atmosphere；
(5) air tightness test: by the low voltage detecting unit being connected with low pressure cavity volume with automatically record unit, real time record The pressure change of low pressure cavity volume, draws the gas permeation curve of sample, thus calculates gas permeation amount and gas transmission coefficient.
Under above two mode of operation, when carrying out step (5) air tightness test, high pressure cavity volume and the pressure reduction of low pressure cavity volume Scope is normal atmosphere～2MPa；The temperature range of high pressure chest assembly and low pressure chamber assembly is room temperature～150 DEG C.
Preferably, under above two mode of operation, when carrying out step (5) air tightness test, high pressure cavity volume and low pressure-volume The pressure differential range in chamber is 0.2～0.3MPa or 0.7～0.8MPa.
The actually used operating mode of tube or inner liner can be preferably simulated under the transformation differential mode formula that relents.
The present invention, relative to prior art, has such advantages as and beneficial effect:
Instant invention overcomes and take time and effort present in prior art, operate that complexity, accuracy be low and high the lacking of cost Point, carries out this type of test on this instrument, and general only need can complete, and can truly simulate under actually used situation for 24 hours Temperature, and real-time rendering pressure history, substantially increase work efficiency, tube or inner liner material are chosen, Improve and all there is very important practical guided significance.
Accompanying drawing explanation
Fig. 1 is the system pie graph for tube or the air tightness detecting apparatus of inner liner of the present invention.
Fig. 2 is the hold down gag of high and low pressure chamber assembly.
Fig. 3 is the automatic supporting device of high and low pressure chamber assembly.
Fig. 4 is the axial section that high pressure chest is perpendicular to sample.
Fig. 5 is the axial section that low pressure chamber is perpendicular to sample.
Fig. 6 is the radial cutaway view being parallel to sample of the heating plate in high and low pressure chamber.
Wherein, 1 high pressure chest assembly, 2 samples, 3 low pressure chamber assemblies, 4 low voltage control unit, 5 low voltage detecting unit, 6 temperature Control unit, 7 temperature detecting units, 8 high voltage control unit, 9 high-pressure detection units, 10 automatically record unit, 11 hold down gags, 12 automatic supporting devices, 100 high pressure cavity volumes, 101 high pressure chest lids, 102 high pressure chest heat-insulation layers, 103 high pressure chest heating plates, 104 height Pressure cavity, 105 high pressure chest temperature sensors, 106 high pressure chest heating rods, 300 low pressure cavity volumes, 301 low pressure chamber lids, 302 low pressure chamber Heat-insulation layer, 303 low pressure chamber heating plates, 304 low pressure volumes, 305 low pressure chamber prop up bracer, 306O RunddichtringO, 307 low pressure chamber temperature Sensor, 308 low pressure chamber heating rods, 309 high sensitivity normally closed solenoid valves, 310 exhaust shutters, 1101 leads, 1102 handss Wheel, 1103 screw rods, 1104 claws, 1201 power sources (such as cylinder, electricity cylinder etc.), 1202 supports.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention do not limit In this.
A kind of tube or the air tightness detecting apparatus of inner liner, concrete as it is shown in figure 1, include high pressure chest assembly 1, examination Sample 2, low pressure chamber assembly 3, low voltage control unit 4, low voltage detecting unit 5, temperature control unit 6, temperature detecting unit 7, high pressure Control unit 8, high-pressure detection unit 9, automatically record unit 10.Wherein, it is placed on high pressure chest assembly 1 and low by fixation kit Sample 2 between pressure chamber assembly 3 compresses, and forms airtight high pressure cavity volume 100 and low pressure cavity volume 300 respectively in the both sides of sample 2, High pressure cavity volume 100 is connected with high voltage control unit 8 and high-pressure detection unit 9 respectively, low pressure cavity volume 300 respectively with low voltage control list Unit 4 and low voltage detecting unit 5 connect, and high voltage control unit 8, low voltage control unit 4, temperature control unit 6 are respectively by corresponding Ground high-pressure detection unit 9, low voltage detecting unit 5 and temperature detecting unit 7 are connected with record unit 10, and record unit carries automatically Data handling system (not shown), high pressure chest assembly 1 and low pressure chamber assembly 3 respectively with temperature control unit 6 and temperature Detector unit 7 connects.
For increasing high pressure cavity volume 100 volume, make to reveal for a long time high pressure cavity volume 100 pressure loss that test causes Little, high pressure cavity volume 100 is connected with test pressure-sustaining gas air accumulator, fills to high pressure cavity volume and pressure-sustaining gas air accumulator during test Enter gases at high pressure；
For the operating mode during preferably simulation is actually used, low pressure cavity volume 300 is by high sensitivity normally closed solenoid valve 309, exhaust shutter 310 is connected with ambient atmosphere, arranges low pressure cavity volume 300 upper pressure limit value, when low voltage detecting unit 5 detects To when causing low pressure chamber pressure value to exceed setting higher limit (normal atmosphere+100Pa) because of long leak test, pass through Low voltage control unit 4 controls the break-make of high sensitivity normally closed solenoid valve 309 and realizes automatic aerofluxus, recovers reference pressure value, thus Simulation tire operating mode in actual use.
As in figure 2 it is shown, described fixation kit is hold down gag 11, hold down gag 11 includes lead 1101, handwheel 1102, screw rod 1103, claw 1104, hold down assembly 11 and low pressure chamber assembly 3 be fixed by screws in identical platform, high pressure chest Assembly 1 is connected with hold down gag 11 by lead 1101, screw rod 1103, holds down assembly and 11 passes through handwheel by firm for claw 1104 Buckle in the oblique groove above low pressure volumes, make high pressure chest assembly 1 and low pressure chamber assembly 3 compress tested sample 2, thus in examination Sample 2 both sides form airtight high pressure cavity volume and low pressure cavity volume；Described high pressure cavity volume is identical with low pressure cavity volume diameter dimension.
As it is shown on figure 3, described fixation kit is automatic supporting device 12, automatic supporting device 12 includes power source 1201 (can be the form such as cylinder, electricity cylinder) and support 1202.The take-off lever of power source 1201 is connected with high pressure chest assembly 1, support 1202 It is fixed in identical platform with low pressure chamber assembly 3.The take-off lever of power source 1201 can be axially extending and retract, thus drives height Pressure chamber assembly 1 raising and lowering, in process of the test, high pressure chest assembly 1 is firmly pressed on low by the take-off lever of power source 1201 On pressure chamber assembly 3 and tested sample 2, thus form airtight high pressure cavity volume 100 and low pressure cavity volume 300 in tested sample 2 both sides.
As shown in Figure 4, high pressure chest assembly 1 includes high pressure chest lid 101, high-pressure chamber 104 and high pressure chest heater, wherein High pressure chest heater includes high pressure chest heat-insulation layer 102, high pressure chest heating plate 103 and high pressure chest temperature sensor 105, high pressure chest Heating plate 103 is positioned at the middle and upper part of high-pressure chamber 104, and high pressure chest heating plate 103 surrounding and top are coated with high pressure chest heat-insulation layer 102, high pressure chest lid 101 is positioned at above high-pressure chamber 104, and high pressure chest lid 101 and high-pressure chamber 104 are connected by screw, high Pressure cavity temperature sensor 105 inserts high pressure chest heating plate 103 from the side of high-pressure chamber 104 through high pressure chest heat-insulation layer 102, High pressure chest temperature sensor 105 is connected (not marking in figure) with temperature detecting unit 7.
As it is shown in figure 5, low pressure chamber assembly 3 includes that low pressure chamber lid 301, low pressure volumes 304 and the low pressure chamber being placed in one add Thermal, wherein low pressure chamber heater includes low pressure chamber heat-insulation layer 302, low pressure chamber heating plate 303 and low pressure chamber temperature sensing Device 307, low pressure chamber heating plate 303 is positioned at the middle and lower part of low pressure volumes 304, and low pressure chamber heating plate 303 surrounding and bottom are coated with Low pressure chamber heat-insulation layer 302, low pressure chamber lid 301 is positioned at below low pressure volumes 304, and low pressure chamber lid 301 and low pressure volumes 304 pass through Screw connects, and low pressure chamber temperature sensor 307 inserts high pressure chest from the side of low pressure volumes 304 through low pressure chamber heat-insulation layer 302 In heating plate 303, low pressure chamber temperature sensor 307 is connected with temperature detecting unit 7, and (not marking in figure, temperature detecting unit 7 is real Border is the process circuit of temperature sensor 105 and 307)；
High pressure chest heater and low pressure can be controlled as required by temperature control unit 6 and temperature detecting unit 7 Chamber heater, accurately controls high pressure cavity volume 100 and the temperature of low pressure cavity volume 300 internal gas, and then simulation rubber for tire material Material variation of ambient temperature situation in actual use；
For ensureing the air-tightness between sample 2 and low pressure chamber assembly 1, the upper design at low pressure volumes 304 has two circles Connected in star, is used for placing O RunddichtringO 306, and specimen finish size is more than O RunddichtringO, as shown in Figure 5；
In process of the test, because sample 2 both sides exist certain pressure reduction, affect ventilative for preventing sample 2 to be deformed The mensuration of area, should be supported in the low-pressure side of sample 2, to resist high side gas pressure load.In this experimental provision, Sample support block 305 is also included, as it is shown in figure 5, the diameter of sample support block 305 is than low pressure cavity volume diameter in low pressure cavity volume 300 Smaller, height is identical with the low pressure cavity volume degree of depth, and it is made up of the material with certain hardness and good breathability, can be to examination Sample 2 is played a supporting role, and to resist gases at high pressure load, makes sample 2 not produce significantly deformation, it is ensured that vapor permeation area is constant.
As shown in Figure 6, heating plate 103 interior parallel of high pressure chest arranges 2 heating rods 106 and a temperature sensor 105；Low pressure chamber heating plate 303 interior parallel arranges 2 heating rods 308 and a temperature sensor 307.Heating rod 106 (308) Connecting with temperature control unit 6, temperature sensor 105 (307) is connected with temperature detecting unit 7, can accurately control as required High pressure chest assembly 1 processed and the temperature of low pressure chamber assembly 3, and then simulate tube or inner liner ring in actual use Border temperature variations.
Under constant temperature and constant-pressure drop, measure tube or the bubble-tight method of inner liner by said apparatus, specifically wrap Include following steps:
(1) sample on measured material, testing wheel fetus in fetus or inner liner sample thickness, then sample 2 is placed in high pressure Between chamber assembly 1 and low pressure chamber assembly 3, with hold down gag 11, high pressure chest assembly 1 and low pressure chamber assembly 3 are fixed, now sample 2 The most compacted, airtight high pressure cavity volume 100 and low pressure cavity volume 300 is formed on sample both sides；
(2) being connected with ambient atmosphere by low pressure cavity volume 300, making low pressure cavity volume 300 initial pressure is normal atmosphere, then High sensitivity normally closed solenoid valve 309 is kept to be closed；
(3) in high pressure cavity volume 100 and constant-pressure gas storage tank, it is filled with the gases at high pressure of setting pressure；
(4) pass through temperature control unit 6 and temperature detecting unit 7 controls high pressure chest heater and low pressure chamber adds hot charging Put, keep high pressure chest assembly 1 and the temperature constant of low pressure chamber assembly 2, protected by high voltage control unit 8 and low voltage control unit 9 The pressure reduction holding high-low pressure cavity volume is constant；
(5) air tightness test: by the low voltage detecting unit 5 being connected with low pressure cavity volume and automatic record unit 10, in real time The pressure changing of record low pressure cavity volume, draws the gas permeation curve of sample, calculates according to GB/T 1038-2000 and gives vent to anger Body transit dose and gas transmission coefficient；
Under the transformation difference that relents, measure fetus in fetus or the bubble-tight method of inner liner by said apparatus, specifically include Following steps:
(1) sample on measured material, testing wheel fetus in fetus or inner liner sample thickness, then sample 2 is placed in high pressure Between chamber assembly 1 and low pressure chamber assembly 3, with hold down gag 11, high pressure chest assembly 1 and low pressure chamber assembly 3 are fixed, now sample 2 The most compacted, airtight high pressure cavity volume 100 and low pressure cavity volume 300 is formed on sample both sides；
(2) being connected with ambient atmosphere by low pressure cavity volume 300, making low pressure cavity volume initial pressure is normal atmosphere, then protects Hold high sensitivity normally closed solenoid valve 309 to be closed；
(3) in high pressure cavity volume 100 and constant-pressure gas storage tank, it is filled with the gases at high pressure of setting pressure under room temperature state；
(4) by temperature control unit 6 and temperature detecting unit 7, control high pressure chest heater and low pressure chamber adds hot charging Put and high pressure chest assembly 1 and low pressure chamber assembly 3 are heated to design temperature and keep constant, after balance, in high and low pressure cavity volume Gas pressure all raises, and now continues to keep high pressure cavity volume airtight, by opening normally closed solenoid valve 309, by low pressure cavity volume with big Gas connects, and after making low pressure cavity volume internal gas pressure be down to normal atmosphere, closes normally closed solenoid valve 309, keeps air-tight state；
(5) air tightness test: by the low voltage detecting unit 5 being connected with low pressure cavity volume and automatic record unit 10, in real time The pressure change of record low pressure cavity volume, draws the gas permeation curve of sample, calculates gas according to GB/T 1038-2000 saturating Excess and gas transmission coefficient.
In the bubble-tight method of said determination, the gas permeation amount of sample and gas transmission coefficient are specifically by following formula It is calculated:
In formula: QgThe gas permeation amount of material, cm3/(m2·d·Pa)；
Δ p/ Δ t stably through time, the arithmetic mean of instantaneous value of low pressure cavity volume gas pressure change in the unit interval, Pa/h；Drawn by low voltage detecting unit and automatic record unit；
V low pressure chamber volume, cm3；Obtain according to practical situation measurement；
The test area of S sample, m2；Obtain according to practical situation measurement；
T test temperature, K；Drawn by temperature detecting unit and automatic record unit；
p1-p2The pressure reduction of sample both sides, Pa；Obtained by high-pressure detection unit, low voltage detecting unit and automatic record unit Go out；
T0, p0Temperature (273.15K) under standard state and pressure (1.0133 × 105Pa)。
D tests thickness, cm；Drawn by measuring samples.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by above-described embodiment Limit, the change made under other any spirit without departing from the present invention and principle, modify, substitute, combine, simplify, All should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (10)
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