CN103196944B - A kind of measurement mechanism of fibrefill fiber assembly heat transfer performance - Google Patents
A kind of measurement mechanism of fibrefill fiber assembly heat transfer performance Download PDFInfo
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- CN103196944B CN103196944B CN201310070303.6A CN201310070303A CN103196944B CN 103196944 B CN103196944 B CN 103196944B CN 201310070303 A CN201310070303 A CN 201310070303A CN 103196944 B CN103196944 B CN 103196944B
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- fibrefill
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Abstract
The present invention relates to a kind of measurement mechanism of fibrefill fiber assembly heat transfer performance, it is characterized in that: comprise thermal insulation protection seat, thermal insulation protection seat top is provided with the groove of two-part, groove lower floor is provided with heating board, heat flux sensor, medical silica-gel layer from below to up successively, the planar dimension of heating board, heat flux sensor and medical silica-gel layer is identical with the planar dimension of groove lower floor, and medical silica-gel layer top is provided with the first temperature sensor; Groove upper strata and test specimen tube immovable fitting, the medial surface of test specimen tube and the lateral surface of pushing cylinder are slidably matched, pushing cylinder upper end is open, lower end is provided with mesh interlayer, is fixedly installed the second temperature sensor above mesh interlayer, and pushing cylinder outer wall is fixedly installed ring, ring is provided with vertical through hole, be inserted in screw rod in vertical through hole, and be fixedly connected with screw rod by a pair height setting nut, screw rod is fixedly connected with thermal insulation protection seat upper surface; Heating plate, heat flux sensor, first and second temperature sensor is connected with control circuit.
Description
Technical field
The present invention relates to a kind of measurement mechanism of heat-insulating property, particularly relate to a kind of measurement mechanism of fibrefill fiber assembly heat transfer performance.Belong to heat trnasfer field of measuring technique.
Background technology
It is heat insulating material formed that fibrefill fiber assembly is commonly used for clothing, and the approach that its heat-preserving function is mainly propagated by intercept heat realizes.Calorie spread carries out mainly through conduction, convection current and radiation three kinds of modes.In actual applications, the characteristic of fibrefill material itself and inner structure affect its transmission speed to heat, and its volume density is one of factor affecting fibrefill aggregate thermal property.
At present, the proving installation for Heat Conductivity of Textiles is more, and the measurement mechanism being specifically designed to fibrefill fiber assembly heat transfer performance is little.Mostly be, by making sample bag, fiber assembly to be put in sample bag, is placed on the test warming instrument of textile flat plane carrying out heat transfer performance to the test of fibrefill material heat transfer performance in the past.And the Chinese invention patent that number of patent application is 200510024967.4 discloses the conductive original position comprehensive measuring method of a kind of variable density fibre aggregate and device, this device tests the various conductive performances of fiber assembly, when wherein heat-conductive characteristic being tested, the well heater selected is that small size is block, distance fiber samples has certain distance, well heater environment temperature is high, and the local temperature departing from well heater is low, so the more difficult control of homogeneity of heating.Aperture that its heat radiation is measured bottom chamber by pushing cylinder carries out heat loss through convection, and this and human body skin are mainly undertaken conducting by small pore and heat loss through radiation has larger difference, truly can not imitate the heat dissipation environment of human body.The clothing employing fibrefill fiber assembly wears in process actual, its warmth retention property is very large by the impact of ambient air speed, although the pushing cylinder of this device measures top of chamber pore window, by regulating the gas penetration potential can improved in cylinder, but this directly contacts completely with air still there is larger difference with the actual fibrefill material that to wear in process, causes the heat transfer performance recorded to have deviation.For pushing cylinder drive part, be connected with driving twin-screw by trave lling girder, adopt motor-driven to control the motion in pushing cylinder measurement chamber, this drive mechanism is relatively complicated, realizes cost higher.In addition, be fastened in bottom test specimen tube in lower measurement chamber, top is hung on the hook of hanger bracket, and can test after need regulating the balance hanging test specimen tube, this structure is loaded down with trivial details, operation inconvenience.The measurement of device to fiber assembly heat-conductive characteristic only has the temperature index in upper and lower measurement chamber, without other correlation parameters such as heat fluxs, cavity temperature ratio can only be measured up and down, carry out the qualitative heat-conductive characteristic providing fiber assembly, quantitatively can not obtain these heat transfer property indexs accurately of the insulation rate of fiber assembly, thermal resistance and clo value.
Summary of the invention
The present invention is on the basis that application number is the patent of invention of 200510024967.4, the improvement that the actual conditions in conjunction with heat transfer performance test are carried out.The technical issues that need to address of the present invention are:
A, well heater heating the more difficult control of homogeneity, fibrefill fiber assembly cannot obtain stable, heat uniformly;
The radiating mode of b, its radiating mode and human body skin has larger difference, truly can not imitate the heat dissipation environment of human body, cause measurement result can referential poor;
C, fibrefill material and the direct contact of outside air are poor, and this and the actual process that wears exist larger difference, cause the heat transfer performance recorded to have deviation;
The drive mechanism more complicated of d, pushing cylinder drive part, realizes cost higher;
E, need first regulate hang test specimen tube balance after can test, complex operation inconvenience;
F, qualitatively can only provide the heat-conductive characteristic of fiber assembly, quantitatively can not obtain these heat transfer property indexs accurately of the insulation rate of fiber assembly, thermal resistance and clo value.Reference value that is professional and measurement result is not high.
The present invention takes following technical scheme:
A kind of measurement mechanism of fibrefill fiber assembly heat transfer performance, comprise thermal insulation protection seat 1, described thermal insulation protection seat 1 top is provided with the groove of two-part, described groove lower floor is provided with heating board 2, heat flux sensor 3, medical silica-gel layer 4 from below to up successively, the planar dimension of described medical silica-gel layer 4 is identical with the planar dimension of described groove lower floor, and its top is provided with the first temperature sensor 5, described groove upper strata and test specimen tube 7 immovable fitting, the medial surface of described test specimen tube 7 and the lateral surface of pushing cylinder 8 are slidably matched, described pushing cylinder 8 upper end is open, lower end is provided with mesh interlayer, the second temperature sensor 9 is fixedly installed above described mesh interlayer, described pushing cylinder 8 outer wall is fixedly installed ring 12, described ring 12 is provided with vertical through hole, screw rod 10 is inserted in described vertical through hole, and be fixedly connected with screw rod 10 by a pair height setting nut 11, described screw rod 10 is fixedly connected with described thermal insulation protection seat 1 upper surface, regulate a pair height setting nut 11, pushing cylinder 8 moves up and down in test specimen tube 7, described heating plate 2, heat flux sensor 3, first and second temperature sensor 5,9 is connected with outside control circuit, and to be connected with computing machine by signal pickup assembly and to carry out data processing.
Further, the planar dimension of described heating plate 2, heat flux sensor 3 is all identical with the planar dimension of described groove lower floor.
Further, described two-part groove is cylindrical, and described test specimen tube 7, pushing cylinder 8 are all cylindrical.
Further, bottom thermal insulation protection seat 1 and surrounding all make heat-barrier coating with the organic glass shell of liner polyurethane foam plastics.
Further, described heating board 2, by the nickel-chromium resistance wire of helical arrangement, is evenly attached on aluminium sheet and forms.
Further, described heat flux sensor 3 is TR heat flux sensor.
Further, described first temperature sensor 5 adopts laminar PN junction temperature sensor.
Further, test specimen tube 7, pushing cylinder 8 are transparent, adiabatic superpolymer, and test specimen tube 7 outer wall is carved with scale.
Further, described second temperature sensor 9 adopts PN junction temperature sensor.
Below technical scheme of the present invention is described in further detail:
Principle of the invention process applies the heat effect close with body temperature in one end of fibrefill fiber assembly, and imitate human-body radiating by simulation human body skin, and then test fibrefill fiber assembly is at the actual heat transfer performance worn in process.Meanwhile, by changing the volume density of fiber assembly in one end of fibrefill fiber assembly force extruding, the impact of volume density for fibrefill fiber assembly thermal property can be probed into.
The nickel-chromium resistance wire that the present invention is circularized by helical arrangement and the less aluminium sheet of thermal resistance with the use of, the uniform heat effect close with body temperature can be sent.Simulate human body skin by medical silica-gel layer thus imitate human-body radiating, making the heat dissipation environment of device more close to human body.The top opening completely of pushing cylinder, directly communicates with air, can imitate fibrefill fiber assembly better in the actual atmospheric environment worn in process.Use screw rod and nut screw connection, the motion of pushing cylinder can be controlled by turning nut, thus realize the object changing fibrefill fiber assembly volume density, be connected than use trave lling girder with driving twin-screw, the motion being controlled pushing cylinder measurement chamber by motor-driven is simplified greatly, easy to use, cost reduces.Test specimen tube is directly fastened in the top of thermal insulation protection seat two-part groove, and can realize balance and stablize fixing, eliminate the link of adjusting sample cylinder balance, structure is all obviously simplified with using.By the temperature measured by acquisition total time on test, accumulative heat time, first and second temperature sensor and heat flux sensor power parameter etc., calculate heat dissipation capacity, insulation rate, thermal resistance and clo value, and then the heat transfer performance of objective and accurate ground quantitatively characterizing fibrefill fiber assembly.
This measurement mechanism forms primarily of four parts, is respectively: heating part, test specimen tube, pushing cylinder, control circuit and signals collecting part.
A, thermal insulation protection seat 1 are the rectangular parallelepipeds with cylindrical groove; cylindrical groove is the groove of two-part; the heating part of measurement mechanism is placed in the bottom of groove; diameter is 10cm; comprise heating board 2, heat flux sensor 3, medical silica-gel layer 4, first temperature sensor 5; the top of two-part groove is used for cutting ferrule test specimen tube 7; diameter is 11cm; bottom thermal insulation protection seat 1 and surrounding make heat-barrier coating by the organic glass shell of liner polyurethane polyfoam, it prevents thermal loss while the stable placement of assurance device.The nickel-chromium resistance wire that heating board 2 is circularized by helical arrangement, is evenly attached on thickness is 3mm, diameter is 10cm circular aluminium sheet and is formed, and this design makes heating board generate heat evenly.The heat flux sensor 3 being positioned at heating board 2 top is TR heat flux sensor, be used for testing the heat acted on medical silica-gel layer 4, its size is identical with heating board 2, and this kind of sensor output signal is large, sensitivity is higher, and the voltage of output and hot-fluid have good linear relationship.The diameter of medical silica-gel layer 4 is identical with heat flux sensor 3, be laid on heat flux sensor 3, medical silica-gel material can be dispelled the heat by surface micropore that is small, that be similar to human body skin pore, the relatively true radiating mode of human body skin, and has good shape stability.First temperature sensor 5 is placed on medical silica-gel layer 4, and select microlamellar PN junction temperature sensor, sensitivity is higher, and does not affect the heat radiation of simulated skin.
B, test specimen tube 7 are fastened in the top of the two-part groove of thermal insulation protection seat 1; the thick 5mm of barrel; external diameter is 11cm; be highly 15cm; material is all-transparent, adiabatic superpolymer, and barrel is carved with scale, can the height of fixing quantity fiber assembly; and then control its volume density, thus realize the measurement of different volumes density fibrefill fiber assembly heat transfer performance.
C, pushing cylinder 8, top is opening completely, directly communicates with air, and bottom is with mesh interlayer, can transferring heat well, can realize again the extruding to fibrefill fiber assembly, its external diameter is identical with the internal diameter of test specimen tube 7, is 10cm, the thick 5mm of barrel, material therefor is identical with test specimen tube 7, and mesh is close and many, ensures that the hot-fluid in test specimen tube 7 and pushing cylinder 8 is unimpeded.Second temperature sensor 9, be fixed on pushing cylinder 8 and can move up and down with pushing cylinder, select PN junction temperature sensor, this size sensor is little, highly sensitive.Screw rod 10 is fixed on thermal insulation protection seat 1; its metric diameter is 10mm; height setting nut 11 is mated use; the ring 12 of fixing pushing cylinder 8 is enclosed within screw rod 10; a pair height setting nut 11 is separately fixed at the upper and lower both sides of ring; by turning and changing the elevating movement that the high and low position of height setting nut 11 on screw rod 10 controls pushing cylinder 8, thus realize the change of fibrefill fiber assembly volume density.
D, control circuit are connected with the second temperature sensor 9 with heating board 2, heat flux sensor 3, first temperature sensor 5 with signal pickup assembly, signal pickup assembly is connected with computing machine can realize the automatic business processing of data, it forms primarily of amplifying circuit, converter and single-chip microcomputer, the feeble signal that sensor exports mainly is amplified by amplifying circuit, meet the requirement of converter to input signal, converter converts the simulating signal after amplification to digital signal, the collection, storage, pre-service etc. of single-chip microcomputer settling signal.
The present invention, according to " test method of insulating property of textile " GB11048-1989 standard, first detects the heat dissipation capacity Q of empty cylinder timer
1, then put into fibrefill fiber assembly sample, apply heat effect in its one end by hot body, the heat dissipation capacity Q after sample is put in test
2, put into the heat dissipation capacity Q after sample
2with heat dissipation capacity Q during empty cylinder
1difference and empty cylinder time heat dissipation capacity Q
1ratio, be the insulation rate of fibrefill fiber assembly, thermal resistance and clo value can by calculating with the relation of insulation rate.Heat dissipation capacity Q is that the power calculation detected by the temperature of the T.T. of testing, accumulative heat time, the first temperature sensor 5 and the second temperature sensor 9 and heat flux sensor 3 draws.
Beneficial effect of the present invention is:
1) can apply the uniform heat effect close with body temperature, imitate human-body radiating by simulation human body skin, the true heating environment imitating human body, truly expressed fibrefill material is at the actual heat transfer performance worn in process;
2) apparatus structure is simple, cost is lower;
3) measuring accuracy is high, is applicable to the test of various fibrefill fiber assembly heat transfer performance;
4) pushing cylinder upper end is not closed, and makes fibrefill material fully and contacting external air, simulates actually to wear process, and test structure is had more can referential;
5) pushing cylinder and thermal insulation protection seat realize being rigidly connected, and without the need to adjustment before using, manipulate easy;
6) add and arrange heat flux sensor, can record these heat transfer property indexs accurately of insulation rate, thermal resistance and clo value, reference value that is professional and measurement result is higher.
Accompanying drawing explanation
Fig. 1 is the cross-sectional schematic of the measurement mechanism of fibrefill fiber assembly heat transfer performance of the present invention.
Fig. 2 is the schematic top plan view of Fig. 1.
Fig. 3 is signal pickup assembly block diagram.
Fig. 4 is the graph of relation of down fiber aggregate insulation rate and the volume density adopting apparatus of the present invention to record.
Wherein, 1-thermal insulation protection seat; 2-heating board; 3-heat flux sensor; 4-medical silica-gel layer; 5-the first temperature sensor; 6-fibrefill fiber assembly; 7-test specimen tube; 8-pushing cylinder; 9-the second temperature sensor; 10-screw rod; 11-height setting nut; 12-ring.
Embodiment
Below in conjunction with specific embodiment, the present invention is further described.
To contribute to understanding the present invention by following examples, but not limit the scope of the invention.
In order to ensure degree of accuracy and the sensitivity of measurement mechanism, ensure that the error of measurement data is no more than the scope of regulation, first will carry out the check and correction of measurement mechanism displayed value and standard value.The signal that first and second temperature sensor spreads out of, is temperature after conversion, and with the temperature of the wet bulb thermometer under standard atmosphere condition for standard temperature is demarcated this temperature, after demarcating, error is not more than 0.1 DEG C.The determination of stability of device heating power is then with within identical interval time, and the thermal resistance value difference of four groups of continuous-readings is no more than 1%, and when not being monotonously to a direction change, is considered as steady state (SS).
Adopt 25V constant voltage DC to power to heat to heating board, stable during the output signal ratio Alternating Current Power Supply of now heat flux sensor, fluctuate little, the power of heating board is 6W, WMNK400 type temperature controller is adopted to control the length of conduction time, make the temperature constant of heating board at 35 DEG C, be equivalent to human body Subcutaneous Temperature, precision is 0.1 DEG C.
See Fig. 1, when empty cylinder, first carry out the preheating of instrument, make heating board temperature remain on 35 DEG C, simulated skin, after the temperature stabilization of the first temperature sensor 5 namely on medical silica-gel layer 4, test can be started.The blank test of advanced line space cylinder, does not place any sample in test specimen tube, and regulate a pair height setting nut 11, the height of pushing cylinder 8 moves to the calibrated position of order, passes into the direct current of voltage regulation of 25V, after certain hour, is read the T.T. t of test by computing machine
1with accumulative heat time t
2, the temperature T of the first temperature sensor 5 will be recorded in the process of test
1, the second temperature sensor 9 on pushing cylinder 8 temperature T
2, and the power N on heat flux sensor 3, by T.T. t
1, accumulative heat time t
2, temperature T
1, temperature T
2and heat dissipation capacity Q during power N calculating clearancen cylinder
1.
After blank test, the down fiber aggregate 2g of random alignment is put into equably in test specimen tube 7, the landing of pushing cylinder 8 is controlled by a pair height setting nut 11 turned on screw rod 10, thus make pushing cylinder 8 extrude down fiber aggregate, its volume density is changed, and the position of pushing cylinder 8 is identical with the height and position scale measured during aforementioned empty cylinder, and device for opening power supply is tested, after certain hour, read the T.T. t of test by computing machine
1' and accumulative heat time t
2', record the temperature T of the first temperature sensor 5
1' and pushing cylinder 8 on the temperature T of the second temperature sensor 9
2', by T.T. t
1', accumulative heat time t
2', temperature T
1', temperature T
2' and the test of empty cylinder in power N on the heat flux sensor 3 that records calculate the heat dissipation capacity Q of down fiber aggregate
2, then by Q
1, Q
2calculate the insulation rate of down fiber aggregate, thermal resistance and clo value can by calculating with the relation of insulation rate.The insulation rate M of the down fiber aggregate recorded thus and the relation curve of its volume density ρ, as shown in Figure 4.
Claims (8)
1. a measurement mechanism for fibrefill fiber assembly heat transfer performance, is characterized in that:
Comprise thermal insulation protection seat (1), described thermal insulation protection seat (1) top is provided with the groove of two-part, described groove lower floor is provided with heating board (2), heat flux sensor (3), medical silica-gel layer (4) from below to up successively, the planar dimension of described medical silica-gel layer (4) is identical with the planar dimension of described groove lower floor, and its top is provided with the first temperature sensor (5);
Described groove upper strata and test specimen tube (7) immovable fitting, the medial surface of described test specimen tube (7) and the lateral surface of pushing cylinder (8) are slidably matched, described pushing cylinder (8) upper end is open, lower end is provided with mesh interlayer, the second temperature sensor (9) is fixedly installed above described mesh interlayer, described pushing cylinder (8) outer wall is fixedly installed ring (12), described ring (12) is provided with vertical through hole, screw rod (10) is inserted in described vertical through hole, and be fixedly connected with screw rod (10) by a pair height setting nut (11), described screw rod (10) is fixedly connected with described thermal insulation protection seat (1) upper surface, regulate described a pair height setting nut (11), pushing cylinder (8) moves up and down in test specimen tube (7),
Described heating plate (2), heat flux sensor (3), first and second temperature sensor (5,9) is connected with outside control circuit, and to be connected with computing machine by signal pickup assembly and to carry out data processing;
Described heating board (2), by the nickel-chromium resistance wire of helical arrangement, is evenly attached on aluminium sheet and forms.
2. the measurement mechanism of fibrefill fiber assembly heat transfer performance as claimed in claim 1, is characterized in that: the planar dimension of described heating plate (2), heat flux sensor (3) is all identical with the planar dimension of described groove lower floor.
3. the measurement mechanism of fibrefill fiber assembly heat transfer performance as claimed in claim 1, it is characterized in that: the groove of described two-part is cylindrical, described test specimen tube (7), pushing cylinder (8) are all cylindrical.
4. the measurement mechanism of fibrefill fiber assembly heat transfer performance as claimed in claim 1, is characterized in that: thermal insulation protection seat (1) bottom and surrounding all make heat-barrier coating with the organic glass shell of liner polyurethane foam plastics.
5. the measurement mechanism of fibrefill fiber assembly heat transfer performance as claimed in claim 1, is characterized in that: described heat flux sensor (3) is TR heat flux sensor.
6. the measurement mechanism of fibrefill fiber assembly heat transfer performance as claimed in claim 1, is characterized in that: described first temperature sensor (5) adopts laminar PN junction temperature sensor.
7. the measurement mechanism of fibrefill fiber assembly heat transfer performance as claimed in claim 1, is characterized in that: test specimen tube (7), pushing cylinder (8) are transparent, adiabatic superpolymer, and test specimen tube (7) outer wall is carved with scale.
8. the measurement mechanism of fibrefill fiber assembly heat transfer performance as claimed in claim 1, is characterized in that: described second temperature sensor (9) adopts PN junction temperature sensor.
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| CN201310070303.6A CN103196944B (en) | 2013-03-06 | 2013-03-06 | A kind of measurement mechanism of fibrefill fiber assembly heat transfer performance |
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| CN103196944B true CN103196944B (en) | 2015-09-16 |
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| CN104173182A (en) * | 2013-11-17 | 2014-12-03 | 陈莉芬 | Moxibustion cylinder |
| CN104215658A (en) * | 2014-08-20 | 2014-12-17 | 中国科学院力学研究所 | High-temperature heat conduction calibration method and high-temperature heat conduction calibration device |
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|---|---|---|---|---|
| US3987660A (en) * | 1974-03-25 | 1976-10-26 | Johns-Manville Corporation | Method of determining thermal conductivity of fiber insulation |
| CN1441251A (en) * | 2003-04-08 | 2003-09-10 | 东华大学 | Microweather simulator for low-temperature microweather facbric test instrument |
| CN1687788A (en) * | 2005-04-07 | 2005-10-26 | 东华大学 | In site synthetic measuring method and apparatus for conductivity of variable density fibre aggregate |
| JP2007040793A (en) * | 2005-08-02 | 2007-02-15 | Japan Synthetic Textile Inspection Inst Foundation | Evaluation method of thermal performance testing of cloth-like fiber material and tester |
| CN102590273A (en) * | 2012-02-21 | 2012-07-18 | 刘宏森 | System and method for detecting warm-keeping rate of a textile |
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2013
- 2013-03-06 CN CN201310070303.6A patent/CN103196944B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3987660A (en) * | 1974-03-25 | 1976-10-26 | Johns-Manville Corporation | Method of determining thermal conductivity of fiber insulation |
| CN1441251A (en) * | 2003-04-08 | 2003-09-10 | 东华大学 | Microweather simulator for low-temperature microweather facbric test instrument |
| CN1687788A (en) * | 2005-04-07 | 2005-10-26 | 东华大学 | In site synthetic measuring method and apparatus for conductivity of variable density fibre aggregate |
| JP2007040793A (en) * | 2005-08-02 | 2007-02-15 | Japan Synthetic Textile Inspection Inst Foundation | Evaluation method of thermal performance testing of cloth-like fiber material and tester |
| CN102590273A (en) * | 2012-02-21 | 2012-07-18 | 刘宏森 | System and method for detecting warm-keeping rate of a textile |
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