CN104122292B - Thermal contact resistance pick-up unit under a kind of LCS condition - Google Patents

Thermal contact resistance pick-up unit under a kind of LCS condition Download PDF

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Publication number
CN104122292B
CN104122292B CN201410390738.3A CN201410390738A CN104122292B CN 104122292 B CN104122292 B CN 104122292B CN 201410390738 A CN201410390738 A CN 201410390738A CN 104122292 B CN104122292 B CN 104122292B
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fixed head
contact resistance
thermal contact
vacuum
measured piece
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CN201410390738.3A
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CN104122292A (en
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张鹏
孙付仲
卢礼华
梁迎春
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Harbin Institute of Technology
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Harbin Institute of Technology
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Abstract

Thermal contact resistance pick-up unit under a kind of LCS condition, relates to thermal contact resistance detection technique field.Solve traditional thermal contact resistance pick-up unit and can only detect the heat transfer situation of measured piece under larger stress, the thermal contact resistance situation under low stress so that unstress state cannot be realized, there is the indelible problem of contact stress effect that material dead weight produces simultaneously.The present invention makes left fixed head and right fixed head be clamped by measured piece by the cooperation of screw rod and nut, thus the low-pressure realizing measured piece loads, by lifting table, measured piece is supported simultaneously, when on-load pressure is larger, then do not need lifting table to support measured piece, thus eliminate the impact of the contact stress produced because of measured piece self gravitation; Multiple temperature sensor is equally spaced to be placed on measured piece, for detecting the temperature of the multiple position of measured piece, and is obtained the result of thermal contact resistance by a series of formula operation.The present invention is applicable to detect thermal contact resistance.

Description

Thermal contact resistance pick-up unit under a kind of LCS condition
Technical field
The present invention relates to thermal contact resistance detection technique field.
Background technology
Faying face thermal contact resistance is as one of faying face key property parameter, its order of accuarcy will directly have influence on Complexed Prostate Specific Antigen characteristic model, and in the contour precision optics of laser instrument, because high contact stress can make material deformation, affect optical accuracy, therefore in this type of optical system, extensively there is low stress contact interface, and under different pretightning force effects, the heat transfer that can greatly affect between material, therefore, under low-stress, the designing and calculating of the thermal contact resistance between Measurement accuracy different materials to optical element plays most important effect.Traditional measuring method can only detect the heat transfer situation of measured piece under larger stress, cannot realize the thermal contact resistance situation under low stress so that unstress state, and the contact stress effect that especially material dead weight produces can not be eliminated.
Summary of the invention
The present invention can only detect the heat transfer situation of measured piece under larger stress to solve traditional thermal contact resistance pick-up unit, the thermal contact resistance situation under low stress so that unstress state cannot be realized, there is the indelible problem of contact stress effect that material dead weight produces simultaneously, propose thermal contact resistance pick-up unit under a kind of LCS condition.
Under a kind of LCS condition, thermal contact resistance pick-up unit comprises vacuum (-tight) housing, coldplate, heat insulation loop, right fixed head, left fixed head, bracing frame, lifting table, heating plate and screw rod, the inside of described vacuum (-tight) housing is vacuum chamber, coldplate, heat insulation loop, right fixed head, left fixed head, bracing frame, lifting table, heating plate and screw rod are all positioned at the inside of described vacuum chamber, described lifting table is fixed on the bottom of vacuum (-tight) housing, heat insulation loop is fixed on the top of lifting table, described heat insulation loop inside is divided into two parts, described two parts are all for placing measured piece, the side of coldplate is fixed on the right side of heat insulation loop, and described coldplate has through hole, the side opening of right fixed head is fluted, coldplate is fixed in the groove of described right fixed head, described right fixed head is vertically fixed on the bottom of vacuum (-tight) housing, the side of heating plate is fixed on the left side of heat insulation loop, and described heating plate has through hole, the side opening of left fixed head is fluted, heating plate is fixed in the groove of described left fixed head, described left fixed head is parallel with right fixed head, and described left fixed head is fixedly connected with by screw rod with right fixed head, the bottom of left fixed head is fixed with bracing frame, support frame as described above is fixed on the bottom of vacuum (-tight) housing.
Described pick-up unit also comprises constant temperature water tank, cold water pipe and hot-water line, described constant temperature water tank inside is divided into cold water memory block and hot water memory block, the two ends of described cold water pipe are all communicated with the cold water memory block of constant temperature water tank, and this cold water pipe is through the through hole of coldplate, the two ends of hot-water line are all communicated with the hot water memory block of constant temperature water tank, and this hot-water line is through the through hole of heating plate.
Described pick-up unit also comprises multiple temperature sensor and temperature display, described multiple temperature sensor is for detecting the temperature of measured piece, the temperature signal output terminal of each temperature sensor is connected with a temperature signal input of temperature display respectively, and described temperature display is used for the temperature of the measured piece that displays temperature sensor detects.
Beneficial effect: the present invention makes left fixed head and right fixed head be clamped by measured piece by the cooperation of screw rod and nut, thus the low-pressure realizing measured piece loads, by lifting table, measured piece is supported simultaneously, when on-load pressure is larger, then do not need lifting table to support measured piece, thus eliminate the impact of the contact stress produced because of measured piece self gravitation;
Environmental requirement according to measuring thermal contact resistance adjusts the environment in vacuum (-tight) housing, thus meets the demand of the thermal contact resistance detection under varying environment condition;
Exported hot water and the cold water of fixed temperature by constant temperature water tank respectively, and coldplate is freezed, heating plate is heated, the temperature difference needed for detection can not only be provided, also ensure the stable of heat flux at steady state simultaneously;
Multiple temperature sensor is equally spaced to be placed on measured piece, for detecting the temperature of the multiple position of measured piece, shown by the temperature of temperature display to measured piece, record the temperature value of each temperature sensor, and obtain the result of thermal contact resistance by a series of formula operation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of the left fixed head 17 described in embodiment one;
Fig. 3 is the structural representation of the right fixed head 9 described in embodiment one;
Fig. 4 is the vertical view of Fig. 3.
Embodiment
Embodiment one, composition graphs 1-Fig. 4 illustrates this embodiment, under a kind of LCS condition described in this embodiment, thermal contact resistance pick-up unit comprises vacuum (-tight) housing 3, coldplate 6, heat insulation loop 7, right fixed head 9, left fixed head 17, bracing frame 14, lifting table 10, heating plate 18 and screw rod 19, the inside of described vacuum (-tight) housing 3 is vacuum chamber, coldplate 6, heat insulation loop 7, right fixed head 9, left fixed head 17, bracing frame 14, lifting table 10, heating plate 18 and screw rod 19 are all positioned at the inside of described vacuum chamber, described lifting table 10 is fixed on the bottom of vacuum (-tight) housing 3, heat insulation loop 7 is fixed on the top of lifting table 10, described heat insulation loop 7 inside is divided into two parts, described two parts are all for placing measured piece, the side of coldplate 6 is fixed on the right side of heat insulation loop 7, and described coldplate 6 has through hole, the side opening of right fixed head 9 is fluted, coldplate 6 is fixed in the groove of described right fixed head 9, described right fixed head 9 is vertically fixed on the bottom of vacuum (-tight) housing 3, the side of heating plate 18 is fixed on the left side of heat insulation loop 7, and described heating plate 18 has through hole, the side opening of left fixed head 17 is fluted, heating plate 18 is fixed in the groove of described left fixed head 17, described left fixed head 17 is parallel with right fixed head 9, and described left fixed head 17 is fixedly connected with nut 8 by screw rod 19 with right fixed head 9, the bottom of left fixed head 17 is fixed with bracing frame 14, support frame as described above 14 is fixed on the bottom of vacuum (-tight) housing 3.
In present embodiment, by the cooperation of screw rod 19 and nut 8, measured piece is clamped by left fixed head 17 and right fixed head 9, thus the low-pressure realizing measured piece loads, supported by lifting table 10 pairs of measured pieces simultaneously, when on-load pressure is larger, then do not need lifting table 10 pairs of measured pieces to support, thus eliminate the impact of the contact stress produced because of measured piece self gravitation.
Environmental requirement according to measuring thermal contact resistance adjusts the environment in vacuum (-tight) housing 3, thus meets the demand of the thermal contact resistance detection under varying environment condition.
Embodiment two, composition graphs 1 illustrate this embodiment, this embodiment is with the difference of thermal contact resistance pick-up unit under a kind of LCS condition described in embodiment one, it also comprises heat insulating element 15, and described heat insulating element 15 is fixed between left fixed head 17 and bracing frame 14.
In present embodiment, by heat insulating element 15, left fixed head 17 and bracing frame 14 are separated, make the heat in heating plate 18 can not be passed to vacuum (-tight) housing 3 by bracing frame 14, thus heat is concentrated, improve accuracy of detection.
Embodiment three, composition graphs 1 illustrates this embodiment, this embodiment is with the difference of thermal contact resistance pick-up unit under a kind of LCS condition described in embodiment one, it also comprises constant temperature water tank 12, cold water pipe 11 and hot-water line 13, described constant temperature water tank 12 comprises refrigeration system and heating system, described cold water pipe 11 forms cooling cycle system with refrigeration system, and described cold water pipe 11 is for freezing to coldplate 6, described hot-water line 13 and heating system form heating circulation system, and described hot-water line 13 is for heating heating plate 18.
In present embodiment, exported hot water and the cold water of fixed temperature by constant temperature water tank 12 respectively, and coldplate 6 is freezed, heating plate 18 is heated, temperature difference needed for detection can not only be provided, also ensure the stable of heat flux at steady state simultaneously.
Under a kind of LCS condition described in embodiment four, this embodiment and embodiment one, the difference of thermal contact resistance pick-up unit is, it also comprises multiple temperature sensor and temperature display 1, described multiple temperature sensor 1 is for detecting the temperature of measured piece, the temperature signal output terminal of each temperature sensor 1 is connected with a temperature signal input of temperature display respectively, the temperature of the measured piece that described temperature display 1 detects for displays temperature sensor.
In present embodiment, multiple temperature sensor is equally spaced to be placed on measured piece, for detecting the temperature of the multiple position of measured piece, shown by the temperature of temperature display 1 pair of measured piece, record the temperature value of each temperature sensor, and obtain the result of thermal contact resistance by a series of formula operation.
Under a kind of LCS condition described in embodiment five, this embodiment and embodiment one, the difference of thermal contact resistance pick-up unit is, it comprises vacuum interface 16 and vacuum pump, described vacuum (-tight) housing 3 has vacuum interface 16, and the pump gas port of vacuum pump is communicated with vacuum (-tight) housing 3 inside by vacuum interface 16.
In present embodiment, when thermal contact resistance testing environment is vacuum condition, be evacuated in vacuum (-tight) housing 3 by vacuum pump, under thermal contact resistance testing environment is normal temperature and pressure, then do not need to be evacuated in vacuum (-tight) housing 3.
The thermal contact resistance pick-up unit that the present invention proposes to the principle that thermal contact resistance detects is:
If two measured piece length are 1, and label is carried out to two measured pieces, left side measured piece is designated as No. 1, right side measured piece is designated as No. 2, the temperature sensor of all equally spaced placement four on two measured pieces, label is 1 successively from left to right, 2, 8, spacing between every two adjacent temperature sensors on each measured piece is m, the distance of the surface of contact of No. 4 temperature sensors and No. 5 temperature sensor distance two measured pieces is n, measuring point temperature is designated as Tii=1 respectively, 2, 8, in order to ensure thermometric accuracy, temperature sensor side head is arranged on the axis of measured piece,
By constant temperature water tank 12 this device heated and freeze, when the range of temperature on temperature display 1 is within the scope of 0.2 DEG C, can think and now record the temperature value of eight temperature sensors by system stability, then:
No. 1 measured piece at the temperature value of surface of contact is:
No. 2 measured pieces at the temperature value of surface of contact are:
The temperature existed at two measured piece surface of contact places is reduced to: △ T=T 1'-T 2',
That is: ΔT = ( T 4 - T 5 ) - ( T 1 + T 2 + T 5 + T 6 ) - ( T 3 + T 4 + T 7 + T 8 ) 4 m · n ;
Circumference hot-fluid q is:
wherein, λ tit is the thermal conductivity of No. 1 measured piece;
Then contact conductane h cfor: h c = q ΔT = λ T ( T 1 - T 4 ) / 3 m ( T 4 - T 5 ) - ( T 1 + T 2 + T 5 + T 6 ) - ( T 3 + T 4 + T 7 + T 8 ) 4 m · n ;
Thermal contact resistance R cfor:

Claims (5)

1. thermal contact resistance pick-up unit under a LCS condition, it is characterized in that, it comprises vacuum (-tight) housing (3), coldplate (6), heat insulation loop (7), right fixed head (9), left fixed head (17), bracing frame (14), lifting table (10), heating plate (18) and screw rod (19), the inside of described vacuum (-tight) housing (3) is vacuum chamber, coldplate (6), heat insulation loop (7), right fixed head (9), left fixed head (17), bracing frame (14), lifting table (10), heating plate (18) and screw rod (19) are all positioned at the inside of described vacuum chamber, described lifting table (10) is fixed on the bottom of vacuum (-tight) housing (3), lifting table (10) supports measured piece, heat insulation loop (7) is fixed on the top of lifting table (10), described heat insulation loop (7) inside is divided into two parts, described two parts are all for placing measured piece, the side of coldplate (6) is fixed on the right side of heat insulation loop (7), the side opening of right fixed head (9) is fluted, coldplate (6) is fixed in the groove of described right fixed head (9), described right fixed head (9) is vertically fixed on the bottom of vacuum (-tight) housing (3), the side of heating plate (18) is fixed on the left side of heat insulation loop (7), the side opening of left fixed head (17) is fluted, heating plate (18) is fixed in the groove of described left fixed head (17), described left fixed head (17) is parallel with right fixed head (9), and described left fixed head (17) is fixedly connected with nut (8) by screw rod (19) with right fixed head (9), the bottom of left fixed head (17) is fixed with bracing frame (14), support frame as described above (14) is fixed on the bottom of vacuum (-tight) housing (3).
2. thermal contact resistance pick-up unit under a kind of LCS condition according to claim 1, it is characterized in that, it also comprises heat insulating element (15), and described heat insulating element (15) is fixed between left fixed head (17) and bracing frame (14).
3. thermal contact resistance pick-up unit under a kind of LCS condition according to claim 1, it is characterized in that, it also comprises constant temperature water tank (12), cold water pipe (11) and hot-water line (13), described constant temperature water tank (12) comprises refrigeration system and heating system, described cold water pipe (11) and refrigeration system form cooling cycle system, and described cold water pipe (11) is for freezing to coldplate (6), described hot-water line (13) and heating system form heating circulation system, and described hot-water line (13) is for heating heating plate (18).
4. thermal contact resistance pick-up unit under a kind of LCS condition according to claim 1, it is characterized in that, it also comprises multiple temperature sensor and temperature display (1), described multiple temperature sensor (1) is for detecting the temperature of measured piece, the temperature signal output terminal of each temperature sensor (1) is connected with a temperature signal input of temperature display respectively, the temperature of the measured piece that described temperature display (1) detects for displays temperature sensor.
5. thermal contact resistance pick-up unit under a kind of LCS condition according to claim 1, it is characterized in that, it comprises vacuum interface (16) and vacuum pump, described vacuum (-tight) housing (3) has vacuum interface (16), the pump gas port of vacuum pump is communicated with vacuum (-tight) housing (3) inside by vacuum interface (16).
CN201410390738.3A 2014-08-08 2014-08-08 Thermal contact resistance pick-up unit under a kind of LCS condition Active CN104122292B (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN108195878A (en) * 2017-12-15 2018-06-22 北京长城华冠汽车科技股份有限公司 The test device and method of a kind of thermal contact resistance

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CN104359942A (en) * 2014-12-01 2015-02-18 哈尔滨工业大学 Interface thermal resistance measuring method in dissimilar metal compound molding process
CN109580707B (en) * 2018-12-21 2021-06-01 中国航空工业集团公司西安航空计算技术研究所 Device and method for measuring contact thermal resistance
CN110927210A (en) * 2019-12-11 2020-03-27 南京工业大学 High-precision thermal contact resistance measuring device under vacuum condition

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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