CN102435402B - Device for detecting leak rate of sealing ring - Google Patents
Device for detecting leak rate of sealing ring Download PDFInfo
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- CN102435402B CN102435402B CN201110393271.4A CN201110393271A CN102435402B CN 102435402 B CN102435402 B CN 102435402B CN 201110393271 A CN201110393271 A CN 201110393271A CN 102435402 B CN102435402 B CN 102435402B
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Abstract
The invention discloses a device for detecting the leak rate of a sealing ring. The device for detecting the leak rate of the sealing ring comprises a ring flange, a flange which is connected with the ring flange in a sealing way, and an inner sealing groove and an outer sealing groove which are arranged between the ring flange and a flange cover, wherein a sealing ring to be detected is arranged in the inner sealing groove, and a standard sealing ring is arranged in the outer sealing groove; an annular leak detection groove and a gas cavity are arranged at a contact part of the ring flange and the flange cover, and the annular leak detection groove is arranged between the outer sealing groove and the inner sealing groove and is communicated with an external leak detection pipe without leakage; and the gas cavity is arranged at the center of the flange and is communicated with a cylinder arranged outside the flange without leakage. The device has the advantages of compact structure, small volume, and convenience and quickness in heating, and the problem that the traditional detection device is difficultly applied to the detection of the leak rate of the sealing ring in high-pressure and high-temperature environments can be solved.
Description
Technical field
The present invention relates to a kind of leak rate of sealing ring leakage detection apparatus, particularly a kind ofly can be within the scope of 0～300 ℃ in temperature, the pressure impermeability device that O type rubber ring leak rate detects while being 0～2.5MPa.
Background technology
Rubber seal is simple in structure, and sealing effectiveness is reliably widely used.Because sealing can not reach zero leakage, so leak rate is the important indicator of design packoff.The material difference of O-ring seal, the environment of adaptation is not identical yet.Temperature and O-ring seal both sides pressure reduction are the essential environmental factors that affects sealing effectiveness.In practical application, have a lot of particular surroundingss, as the sealing of spacecraft work chamber, O-ring seal operting differential pressure is an atmospheric pressure and for a long time in high temperature compressed state; For the sealed pressure vessel of explosion test, it mainly relies on O type rubber ring and flange combination sealing. and the inside and outside pressure of container differs larger.In addition, airspace engine O-ring seal also long-term work in the environment of High Temperature High Pressure.
The Wang Guangzhen of Tsing-Hua University has carried out the slip experiment of silicon rubber O type circle under analog space vacuum environment, experimental system is made up of vacuum system, refrigeration system, vacuum tank, computer data acquisition system, pressure transducer, temperature sensor, testpieces, the impact of load decay and the elemental oxygen radiation etc. of having studied compressibility, temperature, O type circle in space sealing on slip, experimental temperature scope-1～100 ℃, O-ring seal pressure reduction is an atmospheric pressure.Author is by pressure change calculations leak rate, but because leak rate of sealing ring when the small leakage is generally very little, and tonometric precision is limited, therefore in the time of O-ring seal generation minute leakage, can introduce larger error by pressure change calculations leak rate.The pressure reduction of O-ring seal both sides is driving forces of revealing, this system simulation be vacuum environment, O-ring seal one side vacuumizes, opposite side communicates with atmosphere all the time, pressure is up to an atmospheric pressure, cannot realize more O type circle under high pressure and reveal experiment, and testpieces is arranged in vacuum tank, testpieces is heated to inconvenience to some extent.
Summary of the invention
The present invention has designed a kind of device for detecting leak rate of sealing ring, the leak detection groove communicating with outside leak detection tube and the air chamber that can fill high pressure are set in seal flange, and flange can be put into water-bath or the heating of oil bath pan entirety, has solved existing pick-up unit and has been difficult to be applied to the detection to leak rate of sealing ring under high pressure and hot environment.
Technical solution of the present invention is:
A kind of device for detecting leak rate of sealing ring, its special character is, comprises flange that ring flange and blind flange sealed attachment form, is arranged on interior road sealing groove and outer road sealing groove between ring flange and blind flange, is arranged on standard seal circle in outer road sealing groove, is arranged on annular leak detection groove and air chamber between ring flange and blind flange; Described interior road sealing groove is used for placing O-ring seal to be detected; Described belt leak detection groove is arranged between outer road sealing groove and interior road sealing groove, and is communicated with without leaking with outside leak detection tube; Described air chamber is arranged on the center of flange and is communicated with without leaking with the cylindrical shell of flange outer setting; Described cylindrical shell and pressure measuring tube, temperature survey pipe, gas-filled tube, bleeder pipe sealed attachment; Described leak detection tube is connected with leak locator; Described gas-filled tube is connected with high-pressure air source; In described temperature survey pipe, be provided with temperature sensor; In described pressure measuring tube, be provided with pressure transducer.
Above-mentioned high-pressure air source is high-pressure helium, and above-mentioned leak locator is helium mass spectrometer leak detector.
Above-mentioned detection device also comprises the vacuum pump being connected with gas-filled tube; Described high-pressure air source is the combination gas of nitrogen or helium and tracer gas, and described leak locator is trace gas leak detection instrument.
Above-mentioned tracer gas is sulfur hexafluoride.
Above-mentioned detection device also comprises constant temperature bath, and described constant temperature bath is for heating flange.
Above-mentioned detection device also can arrange pressure-regulating valve between gas-filled tube and high-pressure air source.
Above-mentioned blind flange and flange material are 16Mn forging, adopt bolt-connection.
Above-mentioned temperature sensor is thermopair.
Above-mentioned cylindrical shell, pressure measuring tube, temperature survey pipe, gas-filled tube and bleeder pipe preferably adopts five weldless steel tubes to be welded as five connectivity structures, and described weldless steel tube material is 16Mn.
The present invention has following beneficial effect:
1, the present invention arranges the air chamber that can fill high pressure in flange, except meeting the detection at normal pressure lower seal leak rate, can also be used for the detection of high pressure lower seal leak rate.
2, the present invention arranges leak detection groove and communicates with outside leak detection tube in flange, and adopts helium mass spectrometer leak detector or trace gas detection instrument, fast response time, and accuracy is high and easy to operate.
3, cylindrical shell of the present invention, pressure measuring tube, temperature survey pipe, gas-filled tube and bleeder pipe adopt five weldless steel tubes to be welded as five connectivity structures, easy to process, compact conformation.
4, seal flange compact conformation of the present invention, volume are little, and heating is rapidly convenient, can put into water-bath, oil bath etc., and flange entirety heats up evenly, has met the requirement of hot test.
5, the present invention can be to the gentle row Real-Time Monitoring of compressing into of temperature in flange by temperature survey pipe, pressure measuring tube, and by valve regulated air chamber internal pressure, experiment is convenient.
Accompanying drawing explanation
Fig. 1 is device for detecting leak rate of sealing ring flange arrangement schematic diagram;
Fig. 2 is device for detecting leak rate of sealing ring overall schematic;
Fig. 3 is the experimental system sketch that adopts helium mass spectrometer leak detector;
Experimental system sketch when Fig. 4 is trace gas detection;
Fig. 5 is temperature-pressure curve in 200 ℃ of high temperature experiment flanges;
Fig. 6 is temperature-leak rate curve in 200 ℃ of high temperature experiment flanges;
Wherein: 1-blind flange; 2-ring flange; 3-cylindrical shell; 4-pressure measuring tube; 5-temperature survey pipe; 6-gas-filled tube; 7-bleeder pipe; Road sealing groove in 8-; The outer road sealing groove of 9-; 10-air chamber; 11-annular leak detection groove; 12-leak detection tube; 13-hunts leak mouthful; 14-gas cylinder; 10-pressure-regulating valve; 16-temperature sensor; 17-pressure transducer; 18-constant temperature bath; 19-helium mass spectrometer leak detector; 20-signal recorder; 21-vacuum pump; 22-trace gas leak detection instrument.
Embodiment
As shown in Figure 1, device for detecting leak rate of sealing ring of the present invention, comprise the flange of ring flange 2 and blind flange 1 sealed attachment, the interior road sealing groove 8 and the outer road sealing groove that between ring flange 2 and blind flange 1, arrange, the wherein interior placement of interior road sealing groove 8 O-ring seal to be detected, the interior placement standard seal of outer road sealing groove 9 circle.At the contact position open loop shape leak detection groove 11 of ring flange 2 and blind flange 1, annular leak detection groove 11 can be opened on ring flange 2, also can open on blind flange 1, the leak detection groove 11 that goes in ring is arranged between outer road sealing groove 9 and interior road sealing groove 8, and be communicated with without leaking with outside leak detection tube 12, for the detection of slip.Have air chamber 10 in the center of flange, and be communicated with without leaking with the cylindrical shell 3 of flange outer setting.Because the leak rate of standard seal circle can be ignored, therefore the leak rate in leak detection district is the leak rate of O-ring seal to be detected.In said apparatus, the material of blind flange 1 and flange is 16Mn forging, can adopt 8 M16 bolted to connect, and blind flange 1 and flange thickness are 25mm, cylindrical shell 3 internal diameter 50mm, wall thickness 5mm.
In order to realize filling air chamber 10, venting and temperature, the monitoring of pressure, as shown in Figure 2, cylindrical shell 3, pressure measuring tube 4, temperature survey pipe 5, it is that 16Mn weldless steel tube is welded as five communication seals structures that gas-filled tube 6 and bleeder pipe 7 adopt five root timber material, the another port of cylindrical shell 3 wherein communicates with the air chamber 10 in flange, the interior thermopair that arranges of temperature survey pipe 5, the interior pressure gauge that arranges of pressure measuring tube 4, gas-filled tube 6 connects high-pressure air source, between gas-filled tube 6 and high-pressure air source, be provided with pressure-regulating valve 15, in experiment, pass through to regulate pressure-regulating valve 15, the seal leakage rate realizing under different pressures detects, said apparatus can be placed on to water-bath simultaneously, in oil bath etc., flange entirety heats up evenly, meet the requirement of hot test.
The leak detection of gas can adopt helium mass spectrum leak detection method or trace gas leak detection method.In the helium mass spectrum leak detection method experimental system of Fig. 3, high pressure helium gas cylinder is connected with inflation inlet, and centre arranges pressure-regulating valve 15, and thermopair and pressure transducer access recording instrument without paper, can monitor temperature and pressure in flange in real time.Helium mass spectrometer leak detector 19 is connected with leak detection mouth 13, and seal flange is put into constant temperature bath 18 and carried out homogeneous heating.Concrete experimental implementation step is, first connect experimental system according to Fig. 3, at normal temperatures and pressures impermeability device is hunted leak, leak rate meets the requirements and proceeds experiment to being filled with helium in air chamber 10 and air reaches predetermined pressure, flange is put into oil bath pan and be heated to test temperature, in process, adopt temperature sensor 16 and pressure transducer 17 monitor temperatures and pressure, and carry out record with signal recorder 20, hunt leak with helium mass spectrometer leak detector 19 simultaneously.
In the trace gas leak detection experimental system of Fig. 4, vacuum pump 21 connects inflation inlet, and gas bottle is connected to leak detection mouth 13; When experiment, device is vacuumized, while reaching negative pressure in air chamber 10, close vacuum pump 21, open relief port valve and suck valve-off after tracer gas; Continuing to be filled with gases at high pressure in air chamber 10 reaches after experimental pressure, flange is put into 18 heating of constant temperature bath tests, in process, adopt temperature sensor 16 and pressure transducer 17 monitor temperatures and pressure, and carry out record with signal recorder 20, adopt trace gas leak detection instrument 22 to hunt leak simultaneously, tracer gas can adopt sulfur hexafluoride, and gases at high pressure can adopt helium or helium nitrogen mixture gas.
The present invention has been applied to fluororubber O-type sealing ring tightness and can have examined in experiment, temperature, pressure data figure in flange when Fig. 5 is experiment, test temperature is 200 ℃, and in flange, temperature experience heats up, is incubated and cooling three phases, and air chamber 10 internal pressures are 0.8MPa.Fig. 6 is the variation diagram of impermeability device leak rate in experimentation.The O-ring seal examination experiment that to have realized at present temperature and be 0～300 ℃, pressure be 0～2.5MPa, by changing the structure and material of flange, can also be used for the more parameter measurement of high target.It should be noted that, the present invention is not restricted to O type rubber seal, for other material and the O-ring seal of structure, is suitable for too.
Claims (9)
1. a device for detecting leak rate of sealing ring, is characterized in that: comprise flange that ring flange and blind flange sealed attachment form, be arranged on interior road sealing groove and outer road sealing groove between ring flange and blind flange, be arranged on standard seal circle in outer road sealing groove, be arranged on annular leak detection groove and air chamber between ring flange and blind flange; Described interior road sealing groove is used for placing O-ring seal to be detected; Described annular leak detection groove is arranged between outer road sealing groove and interior road sealing groove, and is communicated with without leaking with outside leak detection tube; Described air chamber is arranged on the center of flange and is communicated with without leaking with the cylindrical shell of flange outer setting; Described cylindrical shell and pressure measuring tube, temperature survey pipe, gas-filled tube, bleeder pipe sealed attachment; Described leak detection tube is connected with leak locator; Described gas-filled tube is connected with high-pressure air source; In described temperature survey pipe, be provided with temperature sensor; In described pressure measuring tube, be provided with pressure transducer.
2. device for detecting leak rate of sealing ring according to claim 1, is characterized in that: described high-pressure air source is high-pressure helium, and described leak locator is helium mass spectrometer leak detector.
3. device for detecting leak rate of sealing ring according to claim 1, is characterized in that: also comprise the vacuum pump being connected with gas-filled tube; Described high-pressure air source is the combination gas of nitrogen or helium and tracer gas, and described leak locator is trace gas leak detection instrument.
4. device for detecting leak rate of sealing ring according to claim 3, is characterized in that: described tracer gas is sulfur hexafluoride.
5. according to the device for detecting leak rate of sealing ring described in claim 1 or 2 or 3 or 4, it is characterized in that: also comprise constant temperature bath, described constant temperature bath is for heating flange.
6. device for detecting leak rate of sealing ring according to claim 5, is characterized in that: between gas-filled tube and high-pressure air source, be provided with pressure-regulating valve.
7. device for detecting leak rate of sealing ring according to claim 6, is characterized in that: described blind flange and flange material are 16Mn forging, adopts bolt-connection.
8. device for detecting leak rate of sealing ring according to claim 7, is characterized in that: described temperature sensor is thermopair.
9. device for detecting leak rate of sealing ring according to claim 8, it is characterized in that: described cylindrical shell, pressure measuring tube, temperature survey pipe, gas-filled tube and bleeder pipe adopts five weldless steel tubes to be welded as five connectivity structures, and described weldless steel tube material is 16Mn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110393271.4A CN102435402B (en) | 2011-12-01 | 2011-12-01 | Device for detecting leak rate of sealing ring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110393271.4A CN102435402B (en) | 2011-12-01 | 2011-12-01 | Device for detecting leak rate of sealing ring |
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| CN102435402A CN102435402A (en) | 2012-05-02 |
| CN102435402B true CN102435402B (en) | 2014-06-25 |
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| CN201110393271.4A Active CN102435402B (en) | 2011-12-01 | 2011-12-01 | Device for detecting leak rate of sealing ring |
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| US5375453A (en) * | 1993-08-31 | 1994-12-27 | Westinghouse Electric Corporation | Assembly for evaluating gasket service life and method for performing the same |
| JP3686355B2 (en) * | 2001-06-06 | 2005-08-24 | 三菱重工業株式会社 | Method and apparatus for evaluating characteristics of metal gasket |
| CN2539021Y (en) * | 2002-04-25 | 2003-03-05 | 广州市新龙浩工业技术有限公司 | Leakage-preventing flange sealer |
| CN201083590Y (en) * | 2007-09-06 | 2008-07-09 | 中国核动力研究设计院 | High-temperature high pressure helium-leakage detecting apparatus |
| CN101726396A (en) * | 2009-12-17 | 2010-06-09 | 中国航天科技集团公司第五研究院第五一○研究所 | Device and method for detecting leak rate of O type rubber sealing ring used for spaceflight |
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