CN104697739A - Flow resistance and temperature distribution testing device for low-temperature fluid inside heat insulating corrugated pipes - Google Patents
Flow resistance and temperature distribution testing device for low-temperature fluid inside heat insulating corrugated pipes Download PDFInfo
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Abstract
The invention relates to a flow resistance and temperature distribution testing device for low-temperature fluid inside heat insulating corrugated pipes. The low resistance and temperature distribution testing device for the low-temperature fluid inside the heat insulating corrugated pipes comprises a low-temperature self-pressurization storage tank, a two-stage supercooler, a corrugated pipe testing section, a vaporizer and a gas flowmeter which are connected through metal hoses. The corrugate pipe testing section is communicated with an inflating and exhaust pipe, which adjusts the internal vacuum degree of the corrugated pipe testing section; the inside of the corrugated pipe testing section is provided with a temperature and pressure measuring unit and a vacuum degree measuring unit, and the flow resistance and the temperature distribution of the low-temperature fluid inside the heat insulating corrugated pipe can be obtained according to the temperature, pressure and vacuum degree data inside the heat insulating corrugated pipes. Compared with the prior art, the flow resistance and temperature distribution testing device for the low-temperature fluid inside the heat insulating corrugated pipes is simple in structure, convenient to operate, safe, reliable and applicable to experiment measurement of the flowing and heat transfer characteristics of the low-temperature fluid inside the heat insulating corrugated pipes at different inclinations.
Description
Technical field
The present invention relates to cry-fluid flow and heat transfer characteristic experiment test device, especially relate to cryogenic fluid stream dynamic resistance and Temperature Distribution proving installation in a kind of adiabatic corrugated tube, belong to cryogenic engineering and cryogenic technique field.
Background technology
Cry-fluid flow and heat transfer characteristic are the fundamental propertys of the field extensive concerns such as energy development, chemical industry metallurgical, environmental protection, health care, communications and transportation, space technology, and product newly developed all needs the actual measurement carrying out being correlated with usually.Especially, in the processes such as the production of hyperconductive cable transmission of electricity, liquefied natural gas (LNG) and Liquid Hydrogen fuel stores and transports, the flow behavior measurement of the fluid devices such as all kinds of pipeline, valve, reducing is related to widely.The conveying of cryogen and all be unable to do without vacuum heat-insulated pipe as the circulation of heat eliminating medium, wherein flexible bellow occupies significant proportion in this kind of vacuum heat-insulating pipe.Design a kind of simple and reliable device can realize the Flow-induced vibration characteristic standardization of applicable multiple cryogen in corrugated tube under specified conditions and measure there is important value.
Publication number is the pilot system that patent discloses a kind of cry-fluid flow boiling heat transfer characteristic and drooping characteristic of CN102435632A, this system installs electric heating equipment in vacuum dewar, carries out heat transfer study with drooping characteristic mainly for this specified conditions that seethe with excitement of cry-fluid flow in heat exchanger tube; It only heat exchanger pipeline carry out temperature survey, pipeline cannot be realized along journey temperature survey.In addition, its subcooler cannot realize the fluid precooling of below 77K warm area.The journal article experimental study of flow characteristics " in the corrugated tube " (Engineering Thermophysics journal, 2008, a kind of experimental provision measuring liquid nitrogen resistance to flow in corrugated tube is disclosed 10:1725-1727), be provided with the fluid voltage stabilization and current stabilization that voltage stabilizer makes to enter corrugated tube, there is certain advantage.But this device is not easy to replace the corrugated tube sample of different size, cannot change angle of inclination, not have measuring bellows along journey Temperature Distribution, does not change and detect the performance measurement etc. under different vacuum tightness leakage enthusiasm condition.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and cryogenic fluid stream dynamic resistance and Temperature Distribution proving installation in a kind of adiabatic corrugated tube are provided, this device is applicable to resistance to flow and Temperature Distribution test in the adiabatic corrugated tube of multiple cryogen, device is simple, safe and reliable, the experiment measuring under multiple condition can be realized, conveniently can replace sample pipeline sample, not only provide and different leak drooping characteristic under heat condition, and the Temperature Distribution of synchronous experiments section, the more important thing is and achieve the measurement function of tested pipeline under different angle.
Object of the present invention can be achieved through the following technical solutions:
Cryogenic fluid stream dynamic resistance and Temperature Distribution proving installation in a kind of adiabatic corrugated tube, this proving installation comprises the low temperature that is connected by metal hose from pressurized tanks, two-stage subcooler, corrugated tube experimental section, carburetor and gas meter,
Described corrugated tube experimental section comprises inner corrugated pipe, outward corrugated tube, major diameter operating cavity and inner filling core body, described outward corrugated tube is set in inner corrugated pipe outside, described inside is filled core body and is seated in inner corrugated pipe die place, described major diameter operating cavity is positioned at the two ends of outward corrugated tube, wherein, the two ends of described inner corrugated pipe are communicated with the metal hose of delivering cryogenic fluid
Between inner corrugated pipe and outward corrugated tube, form vacuum insulation cavity, this vacuum insulation cavity is connected with charge and exhaust pipe road, by vacuum tightness in charge and exhaust pipe road adjustment vacuum insulation cavity,
Temperature and pressure measuring unit and vacuum measurement unit is provided with, by cryogenic fluid stream dynamic resistance and Temperature Distribution in the adiabatic corrugated tube of temperature, pressure and vacuum tightness data acquisition in corrugated tube experimental section in described corrugated tube experimental section.
Metal hose is provided with pressure-regulating valve, flow control valve, back pressure regulating valve and switch valve, described pressure-regulating valve is located at low temperature between pressurized tanks and two-stage subcooler, described flow control valve is located between two-stage subcooler and corrugated tube experimental section, described back pressure regulating valve is located between corrugated tube experimental section and carburetor, and described switch valve is located between carburetor and gas meter.
Described two-stage subcooler is divided into first order subcooler and second level subcooler, and first order subcooler is placed in the stainless cylinder of steel of uncovered insulation by first order coil pipe and forms; Second level subcooler is by airtight wide-mouth Dewar, the second level coil pipe be placed in wide-mouth Dewar, and the mechanical pump be communicated with wide-mouth Dewar inside constitutes, and described first order coil pipe and second level coil pipe sequential series are on metal hose.Obtain the cryogen of supercooled state according to two-stage subcooler, wherein first order subcooler completes most exchange heat at ambient pressure, and second level subcooler can realize further crossing cold heat exchange under the condition vacuumized.
Core body is filled for simulating embolus in inner corrugated pipe in described inside, and described inside is filled core body and is fixed on inner corrugated pipe die by teflon spiral support structure, both heatproofs, and it is minimum to enter again resistance to flow, is more convenient for dismounting and replaces.
Described major diameter operating cavity is connected with outward corrugated tube by clip, major diameter operating cavity inside is connected with the vacuum insulation cavity formed between inner corrugated pipe and outward corrugated tube, the two ends of described inner corrugated pipe are connected by ferrule fitting with the connecting pipe in major diameter operating cavity, connecting pipe in major diameter operating cavity is communicated with metal hose, filling multilayer thermal insulation material in the vacuum insulation cavity formed between inner corrugated pipe and outward corrugated tube.Can realize the cutting ferrule attended operation of inner corrugated pipe by opening this major diameter operating cavity, so that flexible dismounting and the tested corrugated tube of replacing and tube core sample, thus the different size realizing tested corrugated tube and tube core sample replaces experiment.
Described charge and exhaust pipe road is connected with major diameter operating cavity inside, and charge and exhaust pipe road is provided with vacuum pump and vacuum valve, and arranges inflation stop valve on charge and exhaust pipe road.
Described temperature and pressure measuring unit comprises differential pressure transmitter, bottom temp sensor and head temperature sensor, the two ends of described differential pressure transmitter are communicated with the two ends of inner corrugated pipe, described differential pressure transmitter realizes micro-pressure-difference and measures, described bottom temp sensor interval is evenly arranged on the bottom outer surface of the vertical direction of inner corrugated pipe, and described head temperature sensor interval is evenly arranged on the outer surface of cupular part of the vertical direction of inner corrugated pipe;
Described vacuum measurement unit comprises the vacuum gauge and digital display vacuum meter that are connected with major diameter operating cavity inside, the vacuum tightness of the vacuum insulation cavity formed between inner corrugated pipe and outward corrugated tube is obtained by vacuum gauge and digital display vacuum meter, corrugated tube adiabatic condition is changed by changing vacuum tightness, the cryogenic pipe gas leakage operating mode in various degree that simulation runs throughout the year, tests the transient flow zone characteristic in corrugated tube under can be used for monitoring different vacuum tightness.
Described differential pressure transmitter, bottom temp sensor and head temperature sensor are all connected with data collecting card, this data collecting card is connected with computing machine, computing machine, according to the temperature, the pressure data that are obtained by differential pressure transmitter, bottom temp sensor and head temperature sensor, obtains cryogenic fluid stream dynamic resistance and Temperature Distribution in adiabatic corrugated tube.
Described corrugated tube experimental section is placed on supporting base, described supporting base is two-part liftable support, comprise base, intermediate stretchable support and the hinge that can stretch, described intermediate stretchable props up the middle part being erected at base, described stretched hinge is provided with two, its one end is connected to left end or the right-hand member of base, and the other end is simultaneously hinged with the top of intermediate stretchable support; The distortion of supporting base bent angle is realized, for cryogenic fluid stream dynamic resistance in corrugated tube adiabatic under different angle and Temperature Distribution test by the angle adjusting the hinge that can stretch.
Compared with prior art, apparatus of the present invention are applicable to resistance to flow and Temperature Distribution test in the adiabatic corrugated tube of multiple cryogen, device is simple, safe and reliable, the experiment measuring under multiple condition can be realized, conveniently can replace sample pipeline sample, not only be provided by apparatus of the present invention and different leak drooping characteristic under heat condition, and the Temperature Distribution of synchronous experiments section, the more important thing is and achieve the measurement function of tested pipeline under different angle.
Accompanying drawing explanation
Fig. 1 is the structural representation of proving installation of the present invention;
Fig. 2 is the partial enlarged drawing of proving installation corrugated tube experimental section of the present invention;
Fig. 3 is the jacking condition schematic diagram of proving installation supporting base of the present invention.
Number in the figure: 1 is that low temperature is from pressurized tanks, 2 is pressure-regulating valve, 3 is stainless cylinder of steel, 4 is first order coil pipe, 5 is wide-mouth Dewar, 6 is second level coil pipe, 7 is mechanical pump, 8 is flow control valve, 9 is major diameter operating cavity, 10 is ferrule fitting, 11 is inner corrugated pipe, 12 is clip, 13 is outward corrugated tube, 14 is vacuum gauge, 15 is inner filling core body, 16 is differential pressure transmitter, 17 is bottom temp sensor, 18 is head temperature sensor, 19 is back pressure regulating valve, 20 is carburetor, 21 is switch valve, 22 is gas meter, 23 is inflation stop valve, 24 is vacuum valve, 25 is vacuum pump, 26 is data collecting card, 27 is computing machine, 28 is base, 29 is intermediate stretchable support, 30 for stretching hinge.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
Cryogenic fluid stream dynamic resistance and Temperature Distribution proving installation in a kind of adiabatic corrugated tube, as Fig. 1, shown in Fig. 2, this proving installation comprises the low temperature that is connected by metal hose from pressurized tanks 1, two-stage subcooler, corrugated tube experimental section, carburetor 20 and gas meter 22, metal hose is provided with pressure-regulating valve 2, flow control valve 8, back pressure regulating valve 19 and switch valve 21, pressure-regulating valve 2 is located at low temperature between pressurized tanks 1 and two-stage subcooler, flow control valve 8 is located between two-stage subcooler and corrugated tube experimental section, back pressure regulating valve 19 is located between corrugated tube experimental section and carburetor 20, switch valve 21 is located between carburetor 20 and gas meter 22.
Two-stage subcooler is divided into first order subcooler and second level subcooler, and first order subcooler is placed in the stainless cylinder of steel 3 of uncovered insulation by first order coil pipe 4 and forms; Second level subcooler is by airtight wide-mouth Dewar 5, the second level coil pipe 6 be placed in wide-mouth Dewar 5, and the mechanical pump 7 be communicated with wide-mouth Dewar 5 inside constitutes, and first order coil pipe 4 and second level coil pipe 6 sequential series are on metal hose.The cryogen of supercooled state is obtained according to two-stage subcooler, wherein first order subcooler completes most exchange heat at ambient pressure, and second level subcooler utilizes the principle of the corresponding unique saturation temperature of saturated vapor pressure can realize further crossing cold heat exchange under the condition vacuumized.
Wherein, corrugated tube experimental section comprises inner corrugated pipe 11, outward corrugated tube 13, major diameter operating cavity 9 and inner filling core body 15, it is outside that outward corrugated tube 13 is set in inner corrugated pipe 11, inner core body 15 of filling is for simulating embolus in inner corrugated pipe 11, inner core body 15 of filling is fixed on inner corrugated pipe 11 die by teflon spiral support structure, both heatproof, it is minimum to enter again resistance to flow, is more convenient for dismounting and replaces.Major diameter operating cavity 9 is positioned at the two ends of outward corrugated tube 13, major diameter operating cavity 9 is connected with outward corrugated tube 13 by clip 12, major diameter operating cavity 9 inside is connected with the vacuum insulation cavity formed between inner corrugated pipe 11 and outward corrugated tube 13, the two ends of inner corrugated pipe 11 are connected by ferrule fitting 10 with the connecting pipe in major diameter operating cavity 9, connecting pipe in major diameter operating cavity 9 is communicated with metal hose, filling multilayer thermal insulation material in the vacuum insulation cavity formed between inner corrugated pipe 11 and outward corrugated tube 13.Can realize the cutting ferrule attended operation of inner corrugated pipe 11 by opening this major diameter operating cavity 9, so that flexible dismounting and the tested corrugated tube of replacing and tube core sample, thus the different size realizing tested corrugated tube and tube core sample replaces experiment.
Vacuum insulation cavity is formed between inner corrugated pipe 11 and outward corrugated tube 13, this vacuum insulation cavity is connected with charge and exhaust pipe road, by vacuum tightness in charge and exhaust pipe road adjustment vacuum insulation cavity, charge and exhaust pipe road is connected with major diameter operating cavity 9 inside, charge and exhaust pipe road is provided with vacuum pump 25 and vacuum valve 24, and inflation stop valve 23 is set on charge and exhaust pipe road.
Temperature and pressure measuring unit and vacuum measurement unit is provided with in corrugated tube experimental section, temperature and pressure measuring unit comprises differential pressure transmitter 16, bottom temp sensor 17 and head temperature sensor 18, the two ends of differential pressure transmitter 16 are communicated with the two ends of inner corrugated pipe 11, differential pressure transmitter 16 realizes micro-pressure-difference and measures, bottom temp sensor 17 is evenly arranged on the bottom outer surface of the vertical direction of inner corrugated pipe 11 at equal intervals, and head temperature sensor 18 is evenly arranged on the outer surface of cupular part of the vertical direction of inner corrugated pipe 11 at equal intervals;
Vacuum measurement unit comprises the vacuum gauge 14 and digital display vacuum meter that are connected with major diameter operating cavity 9 inside, the vacuum tightness of the vacuum insulation cavity formed between inner corrugated pipe 11 and outward corrugated tube 13 is obtained by vacuum gauge 14 and digital display vacuum meter, corrugated tube adiabatic condition is changed by changing vacuum tightness, simulation gas leakage operating mode in various degree, tests the transient flow zone characteristic in corrugated tube under can be used for monitoring different vacuum tightness.
Differential pressure transmitter 16, bottom temp sensor 17 and head temperature sensor 18 are all connected with data collecting card 26, this data collecting card 26 is connected with computing machine 27, computing machine 27, according to the temperature, the pressure data that are obtained by differential pressure transmitter 16, bottom temp sensor 17 and head temperature sensor 18, obtains cryogenic fluid stream dynamic resistance and Temperature Distribution in adiabatic corrugated tube.
In the present embodiment, corrugated tube experimental section is placed on supporting base, supporting base as shown in Figure 3, for two-part liftable support, comprise base 28, intermediate stretchable support 29 and the hinge 30 that can stretch, intermediate stretchable support 29 is located at the middle part of base 28, the hinge 30 that can stretch is provided with two, and its one end is connected to left end or the right-hand member of base 28, and the other end is simultaneously hinged with the top of intermediate stretchable support 29; The distortion of supporting base bent angle is realized, for cryogenic fluid stream dynamic resistance in corrugated tube adiabatic under different angle and Temperature Distribution test by the angle adjusting the hinge 30 that can stretch.
The course of work of apparatus of the present invention is:
Take liquid nitrogen as actuating medium, first low temperature is connected with metal hose by pressure-regulating valve 2, flow control valve 8, back pressure regulating valve 19, switch valve 21 with two-stage subcooler, corrugated tube test section, carburetor 20, gas meter 22 successively from pressurized tanks 1.Corrugated tube experimental section is placed on supporting base.
Vacuumize corrugated tube experimental section, process is: be connected with corrugated tube experimental section by vacuum valve 24 by vacuum pump 25, closes inflation stop valve 23, opens vacuum valve 24, vacuumize between interior outward corrugated tube, treat that vacuum tightness reaches and is stabilized in 10
-3pa closes vacuum valve 24 later.
Precooling is carried out to proving installation, specifically: in the stainless cylinder of steel of uncovered insulation 3 and wide-mouth Dewar 5, pour a small amount of liquid nitrogen into.Open back pressure regulating valve 19, open pressure-regulating valve 2, treat that overpressure is elevated to gauge pressure 0.1MPa, crack flow control valve 8, from pressurized tanks 1, pass into a small amount of liquid nitrogen to corrugated tube experimental section from low temperature, and directly emit.
Formally test: liquid nitrogen is full of the stainless cylinder of steel 3 of uncovered insulation and wide-mouth Dewar 5, opens mechanical pump 7, wide-mouth Dewar 5 is vacuumized.Open pressure-regulating valve 2, back pressure regulating valve 19, switch valve 21, control suitable liquid nitrogen flow by flow control valve 8 and continue through proving installation.
Differential pressure transmitter 16, bottom temp sensor 17, head temperature sensor 18 real-time testing data are recorded by computing machine 27.Use digital display vacuum meter record vacuum gauge 14 survey the vacuum tightness of cavity between inner corrugated pipe and outward corrugated tube.Arrange calculating data and just can obtain cryogenic fluid stream dynamic resistance and Temperature Distribution in adiabatic corrugated tube.
Above-mentioned is can understand and use invention for ease of those skilled in the art to the description of embodiment.Person skilled in the art obviously easily can make various amendment to these embodiments, and General Principle described herein is applied in other embodiments and need not through performing creative labour.Therefore, the invention is not restricted to above-described embodiment, those skilled in the art, according to announcement of the present invention, do not depart from improvement that scope makes and amendment all should within protection scope of the present invention.
Claims (9)
1. cryogenic fluid stream dynamic resistance and Temperature Distribution proving installation in an adiabatic corrugated tube, it is characterized in that, this proving installation comprises the low temperature that is connected by metal hose from pressurized tanks (1), two-stage subcooler, corrugated tube experimental section, carburetor (20) and gas meter (22)
Described corrugated tube experimental section comprises inner corrugated pipe (11), outward corrugated tube (13), major diameter operating cavity (9) and inner filling core body (15), it is outside that described outward corrugated tube (13) is set in inner corrugated pipe (11), described inside is filled core body (15) and is seated in inner corrugated pipe (11) die place, described major diameter operating cavity (9) is positioned at the two ends of outward corrugated tube (13), wherein, the two ends of described inner corrugated pipe (11) are communicated with the metal hose of delivering cryogenic fluid
Between inner corrugated pipe (11) and outward corrugated tube (13), form vacuum insulation cavity, this vacuum insulation cavity is connected with charge and exhaust pipe road, by vacuum tightness in charge and exhaust pipe road adjustment vacuum insulation cavity,
Temperature and pressure measuring unit and vacuum measurement unit is provided with, by cryogenic fluid stream dynamic resistance and Temperature Distribution in the adiabatic corrugated tube of temperature, pressure and vacuum tightness data acquisition in corrugated tube experimental section in described corrugated tube experimental section.
2. cryogenic fluid stream dynamic resistance and Temperature Distribution proving installation in the adiabatic corrugated tube of one according to claim 1, it is characterized in that, metal hose is provided with pressure-regulating valve (2), flow control valve (8), back pressure regulating valve (19) and switch valve (21), described pressure-regulating valve (2) is located at low temperature between pressurized tanks (1) and two-stage subcooler, described flow control valve (8) is located between two-stage subcooler and corrugated tube experimental section, described back pressure regulating valve (19) is located between corrugated tube experimental section and carburetor (20), described switch valve (21) is located between carburetor (20) and gas meter (22).
3. cryogenic fluid stream dynamic resistance and Temperature Distribution proving installation in the adiabatic corrugated tube of one according to claim 1, it is characterized in that, described two-stage subcooler is divided into first order subcooler and second level subcooler, and first order subcooler is placed in the stainless cylinder of steel of uncovered insulation (3) by first order coil pipe (4) and forms; Second level subcooler is by airtight wide-mouth Dewar (5), the second level coil pipe (6) be placed in wide-mouth Dewar (5), and constitute with the inner mechanical pump (7) be communicated with of wide-mouth Dewar (5), described first order coil pipe (4) and second level coil pipe (6) sequential series are on metal hose.
4. cryogenic fluid stream dynamic resistance and Temperature Distribution proving installation in the adiabatic corrugated tube of one according to claim 1, it is characterized in that, core body (15) is filled for simulating inner corrugated pipe (11) interior embolus in described inside, and described inside is filled core body (15) and is fixed on inner corrugated pipe (11) die by teflon support.
5. cryogenic fluid stream dynamic resistance and Temperature Distribution proving installation in the adiabatic corrugated tube of one according to claim 1, it is characterized in that, described major diameter operating cavity (9) is connected with outward corrugated tube (13) by clip (12), major diameter operating cavity (9) inside is connected with the vacuum insulation cavity formed between inner corrugated pipe (11) and outward corrugated tube (13), the two ends of described inner corrugated pipe (11) are connected by ferrule fitting (10) with the connecting pipe in major diameter operating cavity (9), connecting pipe in major diameter operating cavity (9) is communicated with metal hose,
Filling multilayer thermal insulation material in the vacuum insulation cavity formed between inner corrugated pipe (11) and outward corrugated tube (13).
6. cryogenic fluid stream dynamic resistance and Temperature Distribution proving installation in the adiabatic corrugated tube of one according to claim 5, it is characterized in that, described charge and exhaust pipe road is connected with major diameter operating cavity (9) inside, charge and exhaust pipe road is provided with vacuum pump (25) and vacuum valve (24), and inflation stop valve (23) is set on charge and exhaust pipe road.
7. cryogenic fluid stream dynamic resistance and Temperature Distribution proving installation in the adiabatic corrugated tube of one according to claim 1, it is characterized in that, described temperature and pressure measuring unit comprises differential pressure transmitter (16), bottom temp sensor (17) and head temperature sensor (18), the two ends of described differential pressure transmitter (16) are communicated with the two ends of inner corrugated pipe (11), described bottom temp sensor (17) is evenly arranged on the bottom outer surface of the vertical direction of inner corrugated pipe (11) at equal intervals, described head temperature sensor (18) is evenly arranged on the outer surface of cupular part of the vertical direction of inner corrugated pipe (11) at equal intervals,
Described vacuum measurement unit comprises the vacuum gauge (14) and digital display vacuum meter that are connected with major diameter operating cavity (9) inside, is obtained the vacuum tightness of the vacuum insulation cavity formed between inner corrugated pipe (11) and outward corrugated tube (13) by vacuum gauge (14) and digital display vacuum meter.
8. cryogenic fluid stream dynamic resistance and Temperature Distribution proving installation in the adiabatic corrugated tube of one according to claim 7, it is characterized in that, described differential pressure transmitter (16), bottom temp sensor (17), head temperature sensor (18) is all connected with data collecting card (26), this data collecting card (26) is connected with computing machine (27), computing machine (27) basis is by differential pressure transmitter (16), the temperature that bottom temp sensor (17) and head temperature sensor (18) obtain, pressure data, obtain cryogenic fluid stream dynamic resistance and Temperature Distribution in adiabatic corrugated tube.
9. cryogenic fluid stream dynamic resistance and Temperature Distribution proving installation in the adiabatic corrugated tube of one according to claim 1, it is characterized in that, described corrugated tube experimental section is placed on supporting base, described supporting base is two-part liftable support, comprise base (28), intermediate stretchable support (29) and the hinge (30) that can stretch, described intermediate stretchable support (29) is located at the middle part of base (28), described stretched hinge (30) is provided with two, its one end is connected to left end or the right-hand member of base (28), the other end is simultaneously hinged with the top of intermediate stretchable support (29), the distortion of supporting base bent angle is realized, for cryogenic fluid stream dynamic resistance in corrugated tube adiabatic under different angle and Temperature Distribution test by the angle adjusting the hinge (30) that can stretch.
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| CN109029909A (en) * | 2018-10-09 | 2018-12-18 | 浙江省医疗器械检验研究院 | Conduit gas-flow resistance test device |
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