CN102288510B - Hygroscopic weight increment measuring device for low-temperature and heat-insulating foam plastic - Google Patents

Hygroscopic weight increment measuring device for low-temperature and heat-insulating foam plastic Download PDF

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Publication number
CN102288510B
CN102288510B CN2011102036786A CN201110203678A CN102288510B CN 102288510 B CN102288510 B CN 102288510B CN 2011102036786 A CN2011102036786 A CN 2011102036786A CN 201110203678 A CN201110203678 A CN 201110203678A CN 102288510 B CN102288510 B CN 102288510B
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China
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liquid nitrogen
sample
tank
provided
temperature
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CN2011102036786A
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Chinese (zh)
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CN102288510A (en
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张小斌
吴钊
邱利民
杨汝平
马晓静
刘志华
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浙江大学
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Abstract

The invention discloses a hygroscopic weight increment measuring device for low-temperature and heat-insulating foam plastic. A constant-temperature high-humidity box, a sample sleeve, a liquid nitrogen trough, an external liquid nitrogen tank and an internal liquid nitrogen tank are connected in sequence; a flow guiding cover is sleeved outside the sample sleeve; a groove is arranged at the upper end of the constant-temperature high-humidity box; a G-10 washer is arranged in the groove; the inner wall of the constant-temperature high-humidity box is provided with a PTC (positive temperature coefficient) heating resistor and a fan; a water inlet system and a water discharging pipeline are arranged at the lower part of the constant-temperature high-humidity box; an ultrasonic generator and a miniature lifter is arranged at the bottom of the constant-temperature high-humidity box; a sample is mounted in the sample sleeve; a liquid nitrogen inlet pipe, a safety valve and an outlet shutoff valve are arranged at the top of the external liquid nitrogen tank; the liquid nitrogen inlet pipe is provided with a manual shutoff valve; the external liquid nitrogen tank and the internal liquid nitrogen tank are connected with the liquid nitrogen trough; a copper disc is welded at the bottom of the liquid nitrogen trough; the lower part of the external liquid nitrogen tank is provided with a vacuumizing opening; and the outlet shutoff valve is connected with the flow guiding cover through a pipeline. By using the measuring device, the hygroscopic weight increment measurement of the sample is achieved in a high-humidity extreme environment with one side at a super-low temperature and the other side at a room temperature, and furthermore, the sample can be conveniently moved away and mounted.

Description

Cryo Heat Insulation is with polyfoam moisture absorption weightening finish measurement mechanism

Technical field

The present invention relates to Aero-Space and refrigeration low-temperature field of engineering technology, relate in particular to a kind of Cryo Heat Insulation with polyfoam moisture absorption weightening finish measurement mechanism.

Background technology

The solid polyurethane foam has light weight; Characteristics such as physical strength and heat-insulating property are good; Become the standard insulated material of low temp fuel storage tank in the space device, generally through the outside of in-situ spraying at liquid hydrogen (253 ℃) storage tank and liquid oxygen (180 ℃) storage tank.The rocket required thrust is decided by rocket load, for accurately calculating, controlling rocket thrust and required fuel, requires rocket useful load and volume little and accurate.Though foam-thermal insulation density is less, area occupied is big on rocket.Before the rocket launching, the long-time low temperature of foamed material (storage tank wall), one side are exposed to the high humidity physical environment, will absorb the water in air steam in a large number, thereby the useful load during extra increase rocket launching can not ignore the influence of rocket thrust design.

U.S. NASA has carried out long-term experimental study to Cryo Heat Insulation with polyfoam, has investigated the moisture absorption weightening finish under this material aging, the weathering situation.The result shows that foamed material is in the one side liquid nitrogen temperature, and one side room temperature high humidity environment exposes 8 hours down, and it is about 35% ~ 80% that moisture absorption is increased weight, and is equivalent to increase several thousand kilograms of load.Therefore, significant to the quantitative measurment of polyfoam moisture absorption weightening finish to the precise design rocket thrust.

One Chinese patent application book 200910248607.0 disclose a kind of under pressurized state the proving installation of foam class thermal insulation material low-temperature thermal conductivity, this device focuses on measuring the thermal conductivity of foamed material, and is different fully with content of the present invention.

Above-mentioned patent application specification does not all relate to the proving installation of Cryo Heat Insulation with polyfoam moisture absorption weightening finish.

Summary of the invention

The present invention seeks to overcome the deficiency of prior art, provide a kind of profound hypothermia adiabatic with polyfoam moisture absorption weightening finish measurement mechanism.

Cryo Heat Insulation comprises jar, liquid nitrogen tank, kuppe in the high wet tank of constant temperature, Sample sleeve, outer jar of liquid nitrogen, the liquid nitrogen with polyfoam moisture absorption weightening finish measurement mechanism; Jar connects in order in the high wet tank of constant temperature, Sample sleeve, liquid nitrogen tank, outer jar of liquid nitrogen, the liquid nitrogen, and kuppe is sleeved on the Sample sleeve outside; Be provided with groove in the high wet tank of constant temperature upper end; Be provided with the G-10 packing ring in the groove; Be provided with PTC heating resistor, fan at constant temperature high humidity chamber interior wall, be provided with water inlet system, discharge pipe line, be provided with ultrasonic generator and small-sized lifter in the high wet tank of constant temperature bottom at constant temperature high humidity lower box part; Polyfoam sample to be measured is housed in the Sample sleeve; The outer tank top of liquid nitrogen is provided with liquid nitrogen and gets into pipe, safety valve and outlet shutoff valve; Liquid nitrogen gets into pipe and is provided with hand stop valve; Jar links together through welding and liquid nitrogen tank in outer jar of liquid nitrogen and the liquid nitrogen, and the liquid nitrogen tank bottom is welded with the copper dish, and the outer jar of a liquid nitrogen bottom is provided with vacuum orifice; Outlet shutoff valve is connected with kuppe through pipeline.

Described Sample sleeve is low thermal conductivity material that becomes internal diameter such as the right cylinder that fiberglass is processed; The Sample sleeve part is highly surrounded sample, and internal diameter is identical with the test polyfoam, all the other height parts; Internal diameter is greater than the about 3mm of specimen, and the packing ring internal diameter is less than Sample sleeve or sample internal diameter 4mm.

Major advantage of the present invention is that apparatus structure is simple and reliable; Simple to operate; The method of taking can be cooled to rapidly profound hypothermia and since good thermal insulation to guarantee to accomplish to leak under the profound hypothermia heat little; Because the design of small-sized lifter can realize the for convenience detach and installation of sample in the experimentation.

Description of drawings

Fig. 1 for Cryo Heat Insulation with polyfoam moisture absorption weightening finish measurement mechanism structural representation;

Fig. 2 (a) in 14 sensor temperatures of embodiment polyfoam of the present invention test 0~9h hour over time;

Fig. 2 (b) in 14 sensor temperatures of embodiment polyfoam of the present invention test 9~18h hour over time;

Fig. 2 (c) between 14 sensor temperatures of embodiment polyfoam of the present invention test 18~24h hour over time;

Fig. 3 increases weight over time for polyfoam moisture absorption in the embodiment of the present invention;

Among the figure, liquid nitrogen gets in pipe 1, hand stop valve 2, outer jar 3 of Dewar container for liquefied nitrogen, the Dewar container for liquefied nitrogen jars 4, the high wet tank of liquid nitrogen tank 5, Sample sleeve 6, G-10 packing ring 7, PTC heating resistor 8, discharge pipe line 9, ultrasonic generator 10, safety valve 11, outlet shutoff valve 12, nitrogen pipeline 13, vacuum orifice 14, copper dish 15, kuppe 16, sample 17, constant temperature 18, fan 19, water inlet system 20, small-sized lifter 21.

Embodiment

As shown in Figure 1, Cryo Heat Insulation with polyfoam moisture absorption weightening finish measurement mechanism comprise in the high wet tank of constant temperature 18, Sample sleeve 6, outer jar 3 of liquid nitrogen, the liquid nitrogen jars 4, liquid nitrogen tank 5, kuppe 16; Jars 4 connect in order in the high wet tank of constant temperature 18, Sample sleeve 6, liquid nitrogen tank 5, outer jar 3 of liquid nitrogen, the liquid nitrogen, and kuppe 16 is sleeved on Sample sleeve 6 outsides; Be provided with groove in the high wet tank of constant temperature 18 upper ends; Be provided with G-10 packing ring 7 in the groove; Be provided with PTC heating resistor 8, fan 19 at high wet tank 18 inwalls of constant temperature; Be provided with water inlet system 20, discharge pipe line 9 in the high wet tank of constant temperature 18 bottoms, be provided with ultrasonic generator 10 and small-sized lifter 21 in the high wet tank of constant temperature 18 bottoms; Polyfoam sample 17 to be measured is housed in the Sample sleeve 6; Outer jar 3 tops of liquid nitrogen are provided with liquid nitrogen and get into pipe 1, safety valve 11 and outlet shutoff valve 12; Liquid nitrogen gets into pipe 1 and is provided with hand stop valve 2; Jar 4 links together through welding and liquid nitrogen tank 5 in outer jar 3 of liquid nitrogen and the liquid nitrogen; Liquid nitrogen tank 5 bottoms are welded with copper dish 15, and outer jar 3 bottoms of liquid nitrogen are provided with vacuum orifice 14; Outlet shutoff valve 12 is connected with kuppe 16 through pipeline 13.

Described Sample sleeve 6 is low thermal conductivity material that becomes internal diameter such as the right cylinder that fiberglass is processed, and Sample sleeve 6 part height surround sample 17, and internal diameter is identical with test polyfoam 17, all the other height parts, and internal diameter is greater than the about 3mm of specimen.Packing ring 7 internal diameters are less than Sample sleeve 6 or the about 4mm of sample 17 internal diameters.

Whole device divides liquid nitrogen container and the high wet tank two parts of room temperature, reaches low temperature and real warm high humidity environment respectively.The high wet tank of room temperature is wide * high * be 400 * 300 * 400mm deeply, be placed on small-sized lifter top, thereby but realize the casing upper and lower displacement, shift length is not less than 15cm, and the located lateral precision guarantees through 2 side guides.Humidity reaches humidity through ultrasonic humidifier in the case>98% requirement, ultrasonic humidifier is arranged in the casing outer bottom, and by the water surface covering of about 10mm height.For humiture in the guard box is even, on the box wall water surface, arrange small-sized fans, for preventing fan circuit short circuit when the high humidity environment, motor is placed on beyond the casing.The 78K temperature obtains through liquid nitrogen vaporization, and liquid nitrogen container is a double-walled face vacuum insulation structure, vacuumizes between the inside and outside wall, avoids cross-ventilation and heat conduction to leak heat, connects external vacuum pump through vacuum orifice.Wrapped multiple thermal insulation material (MLI) on the internal face, the about 10mm of parcel thickness leaks heat to reduce radiation.Liquid nitrogen container top layout feed tube, escape pipe and survey liquid level hole, wherein feed tube is through to about 5mm place, Dewar container for liquefied nitrogen inner core bottom surface.Evaporation nitrogen is peripheral to Sample sleeve through the escape pipe water conservancy diversion, in order to sample area and surrounding air are isolated.Survey on the liquid level hole and be connected to threeway, the horizontally set safety valve, vertical openings is in order to survey the liquid nitrogen liquid level.Leak for reducing thermal loss, pipeline and the valve etc. that are higher than the Dewar container for liquefied nitrogen top cover all wrap up thermal insulation material.Package unit is installed on the support, and frame bottom is equipped with 4 mobilizable wheels, makes things convenient for package unit to move, about 200 kilograms of whole device general assembly (TW).The Dewar container for liquefied nitrogen bottom connects liquid nitrogen tank, liquid nitrogen tank length overall 45mm, and wherein 20mm is the vacuum length between the liquid nitrogen container double wall.The liquid nitrogen tank open upper end is communicated with Dewar container for liquefied nitrogen, lower end soldering copper dish, and liquid nitrogen can directly contact the copper dish, thus assurance copper dish temperature and liquid nitrogen temperature are approaching.Copper dish external diameter is identical with sample, is 200mm, and thickness 10mm is with being welded on the hollow stainless steel ring end face.The polyfoam thickness 20mm that tests, external diameter is identical with the Sample sleeve internal diameter, is placed in the Sample sleeve, and wherein the lower surface flushes with Sample sleeve, and is exposed in the high wet tank of room temperature, and the upper surface closely contacts with the copper dish end face of about 78K low temperature.

The polyfoam of testing at first is positioned over the Sample sleeve that material is g-10.The long 40mm of Sample sleeve, wherein 20mm length is surrounded sample, and internal diameter is 200mm.Remaining 20mm length is surrounded liquid nitrogen tank, and internal diameter is 220mm, avoids the Sample sleeve inside surface directly to contact with liquid nitrogen tank, leaks heat thereby reduce heat conduction, leaks heat to sample side Influence of Temperature to reduce through Sample sleeve.Sample axially (vertically to) be 192 through an internal diameter, external diameter is that the g-10 packing ring of 220mm is fixed, the packing ring internal diameter helps to prevent that less than sample diameter water vapour from getting into from the slit between sample and the Sample sleeve, increases sample moisture absorption area.Packing ring is placed between sample (or g-10 annulus) and the constant temperature high humidity box top, and such benefit is that along with the high wet tank of constant temperature moves down, packing ring and g-10 Sample sleeve axially break away from, thereby conveniently take out samples weighing.The g-10 annulus that between high wet tank of constant temperature and low-temperature (low temperature) vessel, is exposed to the natural air environment is outside, and the parcel thermal insulation material leaks heat and steam coagulation to reduce.

Claims (2)

1. a Cryo Heat Insulation is characterized in that comprising jar (4), liquid nitrogen tank (5), kuppe (16) in the high wet tank of constant temperature (18), Sample sleeve (6), liquid nitrogen outer jar (3), the liquid nitrogen with polyfoam moisture absorption weightening finish measurement mechanism; Jar (4) connect in order in the high wet tank of constant temperature (18), Sample sleeve (6), liquid nitrogen tank (5), liquid nitrogen outer jar (3), the liquid nitrogen, and kuppe (16) is sleeved on Sample sleeve (6) outside; Be provided with groove in the high wet tank of constant temperature (18) upper end; Be provided with G-10 packing ring (7) in the groove; Be provided with PTC heating resistor (8), fan (19) at the high wet tank of constant temperature (18) inwall; Be provided with water inlet system (20), discharge pipe line (9) in the high wet tank of constant temperature (18) bottom, be provided with ultrasonic generator (10) and small-sized lifter (21) in the high wet tank of constant temperature (18) bottom; Polyfoam sample to be measured (17) is housed in the Sample sleeve (6); Outer jar (3) top of liquid nitrogen is provided with liquid nitrogen and gets into pipe (1), safety valve (11) and outlet shutoff valve (12); Liquid nitrogen gets into pipe (1) and is provided with hand stop valve (2); Jar (4) link together through welding and liquid nitrogen tank (5) in liquid nitrogen outer jar (3) and the liquid nitrogen; Liquid nitrogen tank (5) bottom is welded with copper dish (15), and outer jar (3) bottom of liquid nitrogen is provided with vacuum orifice (14); Outlet shutoff valve (12) is connected with kuppe (16) through pipeline (13).
2. a kind of Cryo Heat Insulation according to claim 1 is with polyfoam moisture absorption weightening finish measurement mechanism; It is characterized in that the right cylinder that described Sample sleeve (6) is processed for the fiberglass that becomes internal diameter; Sample sleeve (6) part is highly surrounded sample (17), and internal diameter is identical with test polyfoam (17), all the other height parts; Internal diameter is greater than specimen 3mm, and packing ring (7) internal diameter is less than Sample sleeve (6) or sample (17) internal diameter 4mm.
CN2011102036786A 2011-07-20 2011-07-20 Hygroscopic weight increment measuring device for low-temperature and heat-insulating foam plastic CN102288510B (en)

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Publication number Priority date Publication date Assignee Title
CN103808593B (en) * 2012-11-09 2016-04-27 浙江大学 A kind of Cryo Heat Insulation polyfoam moisture absorption weightening finish measurement mechanism
CN103076281B (en) * 2013-01-04 2015-09-23 航天材料及工艺研究所 Adiabatic with polyfoam viscid characteristic proving installation under a kind of low temperature and effect of stress
CN103969142A (en) * 2014-05-19 2014-08-06 浙江宏途交通工程科技有限公司 Detection device for performances of foam concrete foaming agent and operation method thereof
US20190150427A1 (en) * 2017-11-17 2019-05-23 Savsu Technologies, Inc. Dry vapor cryogenic container with absorbent core
CN107966382A (en) * 2017-11-20 2018-04-27 北京宇航系统工程研究所 A kind of tank heat insulating construction moisture absorption weight increment test device and method

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