CN104897493B - Low-temperature pressure cycling life test method and system - Google Patents
Low-temperature pressure cycling life test method and system Download PDFInfo
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- CN104897493B CN104897493B CN201410693276.2A CN201410693276A CN104897493B CN 104897493 B CN104897493 B CN 104897493B CN 201410693276 A CN201410693276 A CN 201410693276A CN 104897493 B CN104897493 B CN 104897493B
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Abstract
The invention discloses a kind of low-temperature pressure cycling life test method and system, its typical embodiments includes：Power source and actuated element are used as using vibration generating arrangement and bellows component respectively, the transmission parts of bellows component are connected by the moving component of transmission component and vibration generating arrangement, and cooperatively form the closed sap cavity filled with incompressible cryogen medium and the closed air cavity filled with compressible cryogen medium respectively with bellows component and pressure measurement connecting tube and bellows etc.；And the motion by vibration generating arrangement moving component, drive the transmission parts of bellows component to stretch, so that the liquid for being filled in sap cavity produces extruding to bellows and forms pressure fluctuation.Present system is simple in construction, and assembling maintenance cost is low, easily operated, and can adapt to different amplitude of pressure fluctuation and frequency conveniently by the adjustment to shake table output displacement and frequency, ensures that pressure fluctuation has higher control accuracy.
Description
Technical field
The present invention is more particularly directed to a kind of low-temperature pressure cycling life test system and method, can apply to simulated rocket combustion
Pressure oscillation in material conveying tube road, and to examine on pipeline accumulator bellows in incompressible cryogen media environment
Under fatigue behaviour.
Background technology
The harsh grade of pressure fluctuation in rocket fuel conveyance conduit is by pulsation amplitude, balance pressure and ripple frequency institute
Determine, its simulation medium is usually liquid nitrogen.At present, traditional electromagnetic vibration platform coordinates vibration controller accurately to realize pre-
Determine alternative frequency and displacement amplitude, and larger thrust can be provided.However, the precise displacement control that shake table provides can not be direct
Apply to pressure fluctuation simulated test.In addition, most hydraulic fatigue test equipment can be stored by executive component actuator compression
Depressor bellows air cavity, to realize pulsation amplitude, but because the medium of its executive component is hydraulic oil, sealing means are not suitable for liquid
Nitrogen, and can not be effective heat-insulated to the medium progress in executive component, therefore be also difficult to use.
The content of the invention
In view of deficiency of the prior art, it is an object of the invention to provide a kind of low-temperature pressure cycling life test system
And method.
To achieve these goals, the technical solution adopted by the present invention is as follows：
A kind of low-temperature pressure cycling life test system, including vibration generating arrangement, transmission component, bellows, bellows group
Part and pressure measurement connecting tube, wherein the bellows component is connected through the pressure measurement connecting tube with the bellows, the vibration occurs
Transmission parts of the moving component of device through the transmission component and the bellows component are connected, and the bellows
Cooperatively formed between the transmission parts of component and pressure measurement connection tube cavity and the bellows end face filled with incompressible
Cryogen medium closed sap cavity, between the fixed component and transmission parts of the bellows component and the transmission component
Cooperatively form the closed air cavity filled with compressible cryogen medium.
Further, the liquefaction point temperature for the compressible cryogen medium being filled in the air cavity is not higher than filling
The temperature of incompressible cryogen medium in the sap cavity.
Further, the transmission parts of the bellows component include bellows, and the bellows is located at the fixed part
In part, the transmission component includes power transmission shaft, and the fixed component one end has enclosed construction, and the other end is through pressure measurement connecting tube
It is fixedly connected with bellows, described power transmission shaft one end is connected with the moving component of the vibration generating arrangement, and the other end is described in
Movable end after fixed component one end with the bellows is connected, the ripple pipe outer wall and the fixed component inwall and institute
State and the air cavity is cooperatively formed between the enclosed construction of fixed component one end, the ripple tube cavity and the pressure measurement connecting tube
The sap cavity is cooperatively formed between inner chamber and the bellows end face.
Further, the low-temperature pressure cycling life test system also includes：
To adjust the incompressible cryogen medium of the gentle intracavitary of the sap cavity and compressible cryogen medium
Pressure pressue device, particularly to adjust in the air cavity and sap cavity balance pressure pressue device.
Further, the low-temperature pressure cycling life test system also includes：
To monitor the incompressible cryogen medium of the gentle intracavitary of the sap cavity and compressible cryogen medium
Pressure pressure monitoring system.
Further, incompressible low temperature in the pressure measurement connecting tube can be monitored and controlled in the pressure monitoring system
The amplitude of pressure fluctuation and average pressure of fluid media (medium).
Further, the pressure monitoring system is also connected with low-temperature pressure sensor, the low-temperature pressure sensor with
The sap cavity connection.
Further, the low-temperature pressure cycling life test system also includes the storage tank for filling low-temperature cooling media, special
It is not the storage tank with Open architecture, and the sap cavity and air cavity are immersed in the low-temperature cooling media, to subtract
Incompressible cryogen medium gasifies in few sap cavity.
Further, the low-temperature pressure cycling life test system is also included to provide liquid nitrogen to the liquid nitrogen storage tank
Device.
Further, the transmission component includes guide flange, especially at least ensureing bellows component and transmission
The guide flange that axle vertical-transmission is oriented to, described fixed component one end cooperatively form the enclosed construction with the guide flange,
The power transmission shaft passes perpendicularly through the guide flange.
Further, the moving component of the vibration generating arrangement is coaxially set with the power transmission shaft and the bellows component
Put.Particularly preferably, the moving component of the vibration generating arrangement, the power transmission shaft, the bellows component and pressure measurement connection
Pipe etc. is coaxially disposed.
Further, the transmission component such as described power transmission shaft and guide flange is preferably using the material shape with compared with low heat conductivity
Into such as fiberglass etc., to reduce sap cavity heat transfer.
Further, the transmission component also includes transmission bracket, described in the moving component warp of the vibration generating arrangement
Transmission bracket is connected with the transmission shaft driven.
Further, the fixed component of the bellows component and the guide flange pass through fixed support and the vibration
The pedestal of generating means is fixedly connected.
Further, the low-temperature pressure cycling life test system also includes the motion portion with the vibration generating arrangement
The acceleration transducer of part connection, the acceleration transducer are connected with the control system of the vibration generating arrangement.
Further, the low-temperature pressure cycling life test system also includes：
To provide the first holding vessel of incompressible cryogen medium, first holding vessel is through having stop valve
Pipeline connected with the sap cavity.
Further, the low-temperature pressure cycling life test system also includes：
To provide the second holding vessel of compressible cryogen medium, second holding vessel is passed through with stop valve
Pipeline connects with the air cavity.
Further, incompressible cryogen medium can use comparatively safe cryogen known in the art
Medium, such as liquid nitrogen preferably is used, the compressible cryogen medium can use all kinds of gases known to industry, but excellent
Selected from nitrogen or helium etc..
Further, foregoing low-temperature cooling media preferably uses liquid nitrogen.
Further, foregoing vibration generating arrangement can be selected electric vibration table etc., but not limited to this, and vibration occur
The moving component of device may include moving-coil etc..
A kind of low-temperature pressure cycling life test method, including：
Foregoing any low-temperature pressure cycling life test system is provided,
And start the vibration generating arrangement, the ripple is driven by the moving component of the vibration generating arrangement
The transmission parts of tube assembly, which produce, to be stretched, so that being filled in incompressible cryogen medium of sap cavity to bellows end face
Produce extruding and form pressure fluctuation.
Further, the low-temperature pressure cycling life test method also includes：
The pressure of the gentle intracavitary of sap cavity is monitored with pressure monitoring system,
Pressure in the sap cavity and/or air cavity is adjusted with pressue device, the pressure in the sap cavity is reached setting number
Value, and the moving component of the vibration generating arrangement is substantially at equilbrium position,
And start the vibration generating arrangement and carry out low-temperature pressure cycling life test experiment.
Further, the low-temperature pressure cycling life test method also includes：
Acceleration transducer is set on the moving component of the vibration generating arrangement, and by the acceleration transducer with
The control system connection of the vibration generating arrangement, to monitor the working condition of the vibration generating arrangement, and prevent described
Displacement occurred for vibration generating arrangement.
Compared with prior art, the present invention at least has the following advantages that：
（1）The low-temperature pressure cycling life test method of use can accurately realize pressure fluctuation, and can be according to difference
Testing requirement, balance pressure and the surge pressure being conveniently adjusted in sap cavity, and to vibration generating arrangement, such as shake table
Static load is smaller, solves the problems, such as incompressible cryogen medium gasification in sap cavity and avoids incompressible low temperature
The problem of fluid media (medium) environment dynamic sealing；
（2）The low-temperature pressure cycling life test system architecture of use is simple, and installation maintenance cost is low, easy to use.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments described in invention, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of low-temperature pressure cycling life test system in one embodiment of the invention；
Fig. 2 is a kind of fundamental diagram of low-temperature pressure cycling life test system in one embodiment of the invention；
Description of reference numerals：1- electric vibration tables, 2- moving-coils, 3- transmission brackets, 4- fixed supports, 5- glass power transmission shafts,
6- guide flanges, 7- bellows components, 8- pressure measurement connecting tubes, 9- bellows, 10- liquid storage tanks, the pipelines of 121- first, 122- second
Pipeline, the pipelines of 123- the 3rd, the pipelines of 124- the 4th, the stop valves of 13- first, the stop valves of 14- the 3rd, 15- safety valves, 17- decompressions
Valve, the stop valves of 18- second, the liquid nitrogen containers of 19- first, the liquid nitrogen containers of 20- second, 21- low-temperature pressure sensors, 22- pressure monitorings system
System, 23- nitrogen cylinders.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, detailed retouch is carried out to the technical scheme in the embodiment of the present invention
State, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on the present invention
In embodiment, the every other implementation that those of ordinary skill in the art are obtained on the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
The exemplary embodiments of the system present invention one shown in Figure 1, a kind of its low-temperature pressure cycling life test system being related to
System includes electric vibration table 1, pressure monitor system 22, low-temperature pressure sensor 21 and bellows component 7 etc., wherein, bellows
Component 7 is sequentially arranged in pressure measurement connecting tube 8 and bellows 9, and three encloses to form sap cavity A, the transmission parts of bellows component 7（I.e.
Bellows）It is connected by fiberglass power transmission shaft 5 and transmission bracket 3 with moving-coil 2, and fiberglass power transmission shaft 5 and jigging platform moving coil 2 are same
Axle is set, and is arranged a guide flange 6 on fiberglass power transmission shaft 5, the fixed component and guide flange 6 of line tube assembly 7 pass through fixation
Support 4 is fixedly connected with the pedestal of shake table 1, and is enclosed between the transmission parts and fixed component of guide flange 6 and line tube assembly 7
Conjunction forms air cavity B, bellows component 7 and pressure measurement connecting tube 8 and the grade of bellows 9 is immersed in liquid nitrogen in open liquid nitrogen storage tank 10
In, using reduce in sap cavity as incompressible cryogen medium liquid nitrogen gasification, and liquid nitrogen storage tank 10 is placed on fixation
On support 4, liquid nitrogen filling can be carried out to open liquid nitrogen storage tank 10 by the second liquid nitrogen container 20 and the 3rd pipeline 123.Low temperature pressure
Force snesor 21 monitors the pressure in sap cavity by pressure measurement connecting tube 8.Pass through the first liquid nitrogen container 19（That is the first storage tank）Liquid
Mutually outlet can carry out liquid nitrogen filling to sap cavity, while the opening and closing of the first pipeline 121 can be controlled by the first stop valve 13.Pass through nitrogen
Gas cylinder 23（That is the second storage tank）The nitrogen filling as compressible cryogen medium can be carried out to air cavity, while can be passed through
Output pressure size and the break-make of the second pipeline 122 of the stop valve 18 of pressure-reducing valve 17 and second regulation nitrogen cylinder 23 etc..And may be used also
By nitrogen caused by liquid nitrogen gasification in stop valve 14 and the emission testing system sap cavity of the 4th pipeline 124, and pass through safety valve 15
Prevent from producing too high pressure in pilot system sap cavity.
Previous corrugated tube assembly 7 uses nonstandard bellows, while should meet the application requirement in liquid nitrogen environment, authorized pressure
Under application requirement and fatigue require.Also, wherein bellows can be fixed in any known way.
It is shown in Figure 2, when carrying out low-temperature pressure cycling life test with the low-temperature pressure cycling life test system,
The sap cavity and air cavity of pilot system can be pressurizeed by liquid nitrogen container 19 and nitrogen cylinder 23, until reaching the balance of test requirements document
Pressure value；And the transmission parts of bellows component are driven by shake table, pressure fluctuation is produced, and by adjusting shake table
Power amplifier gain-adjusted shake table displacement, so as to adjust the amplitude of sap cavity pressure fluctuation, wherein each parameter and its
Measurement unit refers to following table：
| Frequency（Hz） | Balance pressure | Pulsation amplitude（MPa） | Number |
| f | P0 | ±ΔP | ≥10000 |
The use step of the low-temperature pressure cycling life test system is as follows：
1. according to regulation torque requirement installation bellows 9 and bellows component 7 etc.；
2. drying sap cavity and air cavity, and check its air-tightness；
3. injecting liquid nitrogen, cooling bellows component 7 etc. into open liquid nitrogen storage tank 10 by liquid nitrogen container 20, liquid is reduced
Incompressible cryogen medium gasifies in chamber；
4. by the way that bellows component, pressure measurement connecting tube and bellows are removed into open liquid nitrogen storage tank, according to the power of regulation
Square is checked to the installation bolt of flange everywhere, and repeats the step 2-3 times, ensures that bolt no longer loosens；
5. the open grade of liquid nitrogen storage tank 10 is fixed on the bearing of electric vibration table 1 by fixed support 4；
6. installing low-temperature pressure sensor 21, and liquid nitrogen is injected in the sap cavity of pilot system by liquid nitrogen container 19, until
After liquid nitrogen occurs in 3rd stop valve 14, the 3rd stop valve 14 is closed, after stable certain time, opens the 3rd stop valve 14,
Nitrogen in emission testing system sap cavity after liquid nitrogen gasification, and repeat the step 2-3 times, will not with the nitrogen amount ensured in sap cavity
Influence result of the test；
7. continuing to inject liquid nitrogen into sap cavity by nitrogen pot 19, sap cavity is pressurizeed, and with pressure detecting system 22
The pressure in sap cavity is detected, the pressure in sap cavity A is less than test requirements document pressure value P0；
8. nitrogen is filled with to the air cavity of pilot system by nitrogen cylinder 23, by adjusting the stop valve of pressure-reducing valve 17 and second
18, the sap cavity of pilot system is balanced pressure and reach requirement pressure value P0；
9. bellows component 7 is arranged on jigging platform moving coil 2 by transmission bracket 3；
10. repeat step 6-8, ensure that the pressure in sap cavity keeps basicly stable；
11. opening electric vibration table, the gain size of the power amplifier of shake table is adjusted, when pulsation amplitude reaches examination
After testing requirement, on-test, is counted to complete defined cycle-index.Bellows is driven by the up-down vibration of jigging platform moving coil
The transmission parts of component, which produce, to be stretched, and the liquid nitrogen in sap cavity is produced extruding to bellows end face, so as to form pressure fluctuation, and
During experiment, by adjusting the power amplifier gain of nitrogen cylinder 23, the 3rd stop valve 14 and electric vibration table, ensure whole
Balance pressure and fluctuation pressure Pass Test requirement during individual experiment.
By previous designs so that low-temperature pressure cycling life test method and system provided by the invention can produce as follows
Good effect：
（a）Hydraulic drive between jigging platform moving coil and bellows is realized using the bellows component with simple structure, and
Avoid the dynamic sealing problem of low temperature environment；
（b）Pressurizeed by the coordination of pilot system air cavity, realize the adjustment of experimental rig sap cavity middle arteries dynamic balancing pressure, subtract
Dead load of the lab scale check system to shake table；
（c）Bellows component etc. is placed in open liquid nitrogen storage tank, suppresses the liquid in pilot system sap cavity well
Nitrogen；
（d）Jigging platform moving coil and bellows are coaxial, and jigging platform moving coil is not in bias, and to the tilting moment of shake table
It is smaller；
（e）The amplitude Pressure behaviour of pilot system is controllable, and controller uses opened loop control, is increased by adjusting power amplifier
Benefit adjusts the stroke of bellows component transmission parts, and then controls fluctuation pressure amplitude；
（f）The balance pressure and fluctuation pressure of pilot system can be moved according to the gasification situation of liquid nitrogen in pilot system sap cavity
State is controllable.
It is summarized, the present invention can adapt to different pressure conveniently by the adjustment to shake table output displacement and frequency
Amplitude of pulsing and frequency, ensure that pressure fluctuation has higher control accuracy, carry out pressure actuation secondly by bellows component, keep away
The problem of having exempted from low temperature dynamic sealing, again, system sap cavity are immersed in incompressible cryogen medium, reduce liquid as far as possible
Chamber and extraneous heat exchange.Meanwhile it is simple using used system architecture, assembling maintenance cost is low, easily operated.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply and deposited between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability includes, so that process, method, article or equipment including a series of elements not only will including those
Element, but also the other element including being not expressly set out, or it is this process, method, article or equipment also to include
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element also be present in process, method, article or equipment including the key element.
It should be appreciated that described above is only the embodiment of the present invention, it is noted that for the general of the art
For logical technical staff, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improve and
Retouching also should be regarded as protection scope of the present invention.
Claims (9)
- A kind of 1. low-temperature pressure cycling life test system, it is characterised in that including：Vibration generating arrangement, transmission component, bellows （9）, bellows component（7）, pressure measurement connecting tube（8）, wherein the bellows component（7）Through the pressure measurement connecting tube（8）With institute State bellows（9）Connection, the moving component of the vibration generating arrangement is through the transmission component and the bellows component（7）Biography Dynamic component is connected, and the transmission parts of the bellows component and the pressure measurement connecting tube（8）Inner chamber and the bellows （9）The closed sap cavity filled with incompressible cryogen medium, the bellows component are cooperatively formed between end face（7） Fixed component and transmission parts and the transmission component between cooperatively form filled with the close of compressible cryogen medium Hold one's breath chamber；The bellows component（7）Transmission parts include bellows, the bellows is in the fixed component, institute Stating transmission component includes power transmission shaft（5）, the fixed component one end has enclosed construction, and the other end is through pressure measurement connecting tube（8） With bellows（9）It is fixedly connected, the power transmission shaft（5）One end is connected with the moving component of the vibration generating arrangement, and the other end is worn It is connected after crossing the fixed component one end with the movable end of the bellows, in the ripple pipe outer wall and the fixed component The air cavity, the ripple tube cavity and the pressure measurement are cooperatively formed between the enclosed construction of wall and the fixed component one end Connecting tube（8）Inner chamber and the bellows（9）The sap cavity is cooperatively formed between end face；And to adjust the incompressible cryogen medium of the gentle intracavitary of the sap cavity and compressible cryogen medium Pressure pressue device；And to monitor the incompressible cryogen medium of the gentle intracavitary of the sap cavity and compressible cryogen medium Pressure pressure monitoring system.
- 2. low-temperature pressure cycling life test system according to claim 1, it is characterised in that also include filling low temperature cold But the storage tank of medium, the sap cavity and air cavity are immersed in the low-temperature cooling media.
- 3. low-temperature pressure cycling life test system according to claim 1, it is characterised in that：The transmission component includes Guide flange（6）, described fixed component one end and the guide flange（6）Cooperatively form the enclosed construction, the power transmission shaft （5）Pass perpendicularly through the guide flange（6）.
- 4. low-temperature pressure cycling life test system according to claim 1, it is characterised in that：The transmission component also wraps Include transmission bracket（3）, the moving component of the vibration generating arrangement is through the transmission bracket（3）With the power transmission shaft（5）Transmission Connection.
- 5. low-temperature pressure cycling life test system according to claim 1, it is characterised in that also include：To provide not First holding vessel of compressible cryogen medium, first holding vessel pass through the pipeline with stop valve and connected with the sap cavity It is logical.
- 6. low-temperature pressure cycling life test system according to claim 1, it is characterised in that also include：Can to provide Second holding vessel of the cryogen medium of compression, second holding vessel pass through the pipeline with stop valve and connected with the air cavity It is logical.
- A kind of 7. low-temperature pressure cycling life test method, it is characterised in that including：Low-temperature pressure cycling life test system any one of claim 1-6 is provided,And start the vibration generating arrangement, the bellows group is driven by the moving component of the vibration generating arrangement The transmission parts of part, which produce, to be stretched, so that the incompressible cryogen medium for being filled in sap cavity produces to bellows end face Extrude and form pressure fluctuation.
- 8. low-temperature pressure cycling life test method according to claim 7, it is characterised in that also include：The pressure of the gentle intracavitary of sap cavity is monitored with pressure monitoring system,Pressure in the sap cavity and/or air cavity is adjusted with pressue device, the pressure in the sap cavity is reached setting numerical value, and The moving component of the vibration generating arrangement is set to be substantially at equilbrium position,And start the vibration generating arrangement and carry out low-temperature pressure cycling life test experiment.
- 9. low-temperature pressure cycling life test method according to claim 7, it is characterised in that also include：In the vibration Acceleration transducer is set on the moving component of generating means, and by the acceleration transducer and the vibration generating arrangement Control system connects, and to monitor the working condition of the vibration generating arrangement, and prevents the vibration generating arrangement from occurring Displacement.
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| CN201410693276.2A CN104897493B (en) | 2014-11-26 | 2014-11-26 | Low-temperature pressure cycling life test method and system |
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| CN201410693276.2A CN104897493B (en) | 2014-11-26 | 2014-11-26 | Low-temperature pressure cycling life test method and system |
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| CN105444973B (en) * | 2015-11-17 | 2018-06-26 | 上海航天精密机械研究所 | Low-temperature pressure Automatic-boosting balancing device |
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| CN111551378A (en) * | 2020-04-26 | 2020-08-18 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Reliability test device and test system suitable for liquid nitrogen cooling equipment |
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| CN111998997A (en) * | 2020-09-27 | 2020-11-27 | 中国航空工业集团公司北京长城计量测试技术研究所 | Low-temperature pulsating pressure calibration device |
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| CN113340552A (en) * | 2021-05-28 | 2021-09-03 | 天津航天瑞莱科技有限公司 | Liquid nitrogen medium pressure generating device |
| CN113959858B (en) * | 2021-11-16 | 2024-03-15 | 沈阳仪表科学研究院有限公司 | Metal bellows stability test device |
| CN114323954B (en) * | 2022-01-07 | 2022-07-15 | 珠海市三思泰捷电气设备有限公司 | Mechanical property testing equipment for material with variable-temperature tension-torsion composite load |
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| KR20100045719A (en) * | 2008-10-24 | 2010-05-04 | 한국전력공사 | Stiffness measurement apparatus of super conductor bearing |
| CN102297809A (en) * | 2010-06-22 | 2011-12-28 | 上海航天精密机械研究所 | Low-temperature fatigue test system of corrugated pipe |
| CN203616084U (en) * | 2013-11-18 | 2014-05-28 | 北京宇航***工程研究所 | Fill and relief valve low temperature vibration test device for carrier rocket |
| CN103712787B (en) * | 2013-12-27 | 2016-12-07 | 天津航天瑞莱科技有限公司苏州分公司 | Pressures cycle service life experiment system and method |
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| CN204286961U (en) * | 2014-11-26 | 2015-04-22 | 天津航天瑞莱科技有限公司苏州分公司 | Be applied to the equipment of low-temperature pressure cycle life test |
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