CN101915781B - Thermal contact resistance test equipment with compensating heating device - Google Patents

Abstract

The invention discloses a contact thermal resistance testing device with a compensation heating device, which mainly includes a bracket, a top plate, a bottom plate, a stress loading device, a cooling device, a data acquisition system, a heating device and a temperature compensation device. The compensation heating device includes A thermocouple and a ring heater, the thermocouple is arranged on the ring heater; the ring heater is arranged in a radial plane at the contact interface of every two samples; the thermocouple and the temperature control The temperature controller controls the on-off of the ring heater through the temperature data fed back by the thermocouple. By adjusting the temperature control point of the temperature controller, the heating temperature of the ring heater can be controlled within the theoretical conduction temperature range, so that the axial transmission of the heat flow at the contact interface of the sample is maximized, the lateral heat flow is avoided, and the heat flow is realized. Axial one-dimensional transfer.

Description

The thermal contact resistance test equipment that has compensating heating device

Technical field

The invention belongs to technical field of measurement and test, be specifically related to a kind of thermal contact resistance method of testing and equipment, be applicable to the test of in different temperatures and loading stress scope, carrying out thermal contact resistance, especially possess the thermal contact resistance test condition under high temperature, the high contact stress condition.

Background technology

When two body surfaces are in contact with one another, no matter how smooth the surface is, always there is the incomplete contact point of microcosmic.The surface in contact of object is kept apart by big space between these contact points by disperseing tiny contact point to form, and possibly be vacuum in these spaces, also maybe the falling heat-transfer medium.Therefore, except intrinsic thermal resistance, also there is extra heat transmission resistance---thermal contact resistance at the surface of contact place.Thermal contact resistance is an important parameters in a lot of practical applications.The research of thermal contact resistance now mainly concentrates on theoretical analysis and calculating Methods Research aspect; Promptly through setting up mathematical model; The mode of utilization computer simulation is predicted thermal contact resistance, then through with document in test figure compare the reliability of judgment models again.Present main calculation methods has: finite element method, Monte Carlo random point method, molecular dynamics method etc.But these method parameters are more, error is bigger, and are also impracticable on engineering.

Summary of the invention

The present invention is in order to solve simple problem of relying on theory and analog computation to carry out thermal contact resistance test existence in the prior art; A kind of thermal contact resistance engineering test method of testing and equipment thereof are provided; Described method of testing adopts many root timbers material samples and a heat flow meter to form an axial heat passage; Gather axial many test points of hot-fluid transmission direction temperature respectively; Adopt multilayer insulation material and interface temperature compensation technique to reduce heat simultaneously and laterally scatter and disappear phenomenon, realize the test of thermal contact resistance according to the test point temperature of gathering contacting the influence of thermo-resistance measurement.

Thermal contact resistance test equipment provided by the invention has compensating heating device; The described thermal contact resistance test equipment that has compensating heating device; Mainly comprise support, top board, base plate, answer force loading device, cooling device, data acquisition system (DAS), heating arrangement and temperature compensation means; Said top board and base plate are horizontally fixed on four supports through four groups of nuts respectively; And top board is positioned at the top of base plate, sets gradually heating arrangement, sample, cooling device between base plate and the top board from the bottom to top and answers force loading device; The said force loading device of answering is fixed on the top board center, answers the power conductive bar of force loading device to pass cooling device and contacts with the top of sample, is used to sample top loading stress; Said base plate is regulated level angle and vertical height through four groups of nuts, and heating arrangement is set on the base plate, is used to the sample heating;

Described compensating heating device comprises thermopair and ring heater, and described thermopair is arranged on the ring heater; Described ring heater is arranged in the sagittal plane at contact interface place of per two samples; Described thermopair links to each other with temperature controller, and temperature controller is through the break-make of the temperature data control ring heater of this thermopair feedback.

The invention has the advantages that:

(1) heat block in the heating arrangement of the present invention's employing is a high-temperature material; Answer force loading device that the interface contact stress of 500MPa can be provided; Therefore equipment provided by the invention can carry out the thermal contact resistance testing experiment high temperature, high contact stress under, and can change hot-side temperature (≤1000 ℃) continuously on request and adjust loading stress (≤500MPa).

(2) temperature required through the power control hot junction of silicon-controlled voltage regulation device control heater strip; Avoid the lateral heat flow loss through multilayer insulation material and interface temperature compensation; And adopt cooling device to make the hot junction of test sample and colling end form the very big temperature difference, realized the one dimension transmission that hot-fluid is axial.

(3) equipment provided by the invention can detect and record multichannel monitoring point temperature simultaneously, and analyzes and add up, thereby has improved work efficiency, the error of having avoided each passage of cycle index to be brought.

(4) method of testing provided by the invention can test sample thermal contact resistance under thermal stress and compressive stress act on simultaneously, and method simply is easy to realize.

Description of drawings

Fig. 1 is a thermal contact resistance test equipment one-piece construction synoptic diagram provided by the invention;

Fig. 2 is the layout of thermopair on the sample among the present invention;

Fig. 2 a is the structural representation of stable support frame among the present invention;

Fig. 3 is top board loss of weight structural representation among the present invention;

Fig. 4 a looks cut-open view for the master of cooling water tank among the present invention;

Fig. 4 b is the vertical view of cooling water tank among the present invention;

Fig. 5 a is heating arrangement structural representation among the present invention;

Fig. 5 b is the cylindrical shape cartridge heater structural representation of heating arrangement among the present invention;

Fig. 5 c is the structural representation of heat block among the present invention;

Fig. 6 is the structural representation of compensating heating device among the present invention;

Fig. 6 a is a support bracket fastened upward view in the compensating heating device;

Fig. 6 b is a support bracket fastened front view in the compensating heating device.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is elaborated.

The present invention provides a kind of thermal contact resistance method of testing; This method of testing utilizes the characteristic of the temperature variation that hot-fluid transmits between the different materials interface to detect the interface thermal contact resistance, thus this kind method adopt fairly simple, reliable, measuring accuracy is higher, the testing apparatus of easy operating is just passable.But, need the regular hour just can reach thermal equilibrium, so the data that reach after the stable state are only believable because of temperature element and surrounding medium need carry out sufficient heat interchange.Based on above-mentioned factor, thermal contact resistance method of testing provided by the invention specifically realizes through following steps:

The first step, the preparation of test sample and equipment.

Process at least three samples; Comprise a heat flow meter sample and two test samples; Be installed in the bottom heating arrangement and the top is answered between the force loading device with three samples are vertically coaxial; Described sample is provided with thermopair, and thermopair is connected with data acquisition system (DAS), is used to test and gather the axial temperature of sample.

In second step,, gather sample testing point temperature to sample heating and loading compressive stress.

Through heating arrangement sample is heated, and sample is applied compressive stress, after 3～4 hours, treat that specimen temperature reaches and begin the collecting test temperature after stable.Described probe temperature comprises the test point temperature T of n test point on each sample _iI=1 ... N, n are test point number on the sample.Described test point temperature T _iTest point thermopair through on sample, being uniformly distributed with is gathered, and the probe of described test point thermopair is arranged on the axis of sample, guarantees the accuracy of thermometric.

For example the distance between the test point satisfies following relation on the sample: specimen length is l; Axial distance between adjacent two test points equates; N test point is set between from the lower surface to the upper surface on each sample; Distance between the test point is l/n, and first test point equals the distance of n test point apart from the upper surface apart from the distance of lower surface, and two equal the distance between adjacent two test points apart from sum.Test sample is vertically coaxial, and test point is evenly arranged from top to bottom, serial number.

Thermopair connects data acquisition system (DAS), and the temperature variation that shows each test point on the sample when computing machine on the data acquisition system (DAS) can think that axial hot-fluid transmission has reached stable state in 0.5 degree the time.

In the 3rd step, adjacent samples is in the medial temperature at contact interface place.

Temperature on each test point on the sample is gathered and stored, and pass through the temperature variation curve at computer drawing test point place.

On per two adjacent samples, the temperature of two the test point thermopairs nearest apart from contact interface is T _nAnd T _N+1, then the below sample n test point temperature T _nThe 1st test point temperature T with adjacent top sample _N+1Mean value be exactly the medial temperature at two sample contact interface places, then the medial temperature Δ T ' at contact interface place is:

$\mathrm{\Δ}{T}^{\′}=\frac{T_n+T_{n+1}}{2}.$

In the 4th step, the sample contact interface is carried out temperature compensation.

The medial temperature Δ T ' at contact interface place is conducted temperature as the theory between adjacent two samples, the sample contact interface is carried out temperature compensation, adopt compensating heating device to guarantee that the contact interface place of sample keeps the theoretical temperature Δ T ' that conducts.

In the 5th step, confirm that through the extrapolation thermograde Δ T falls in the temperature at adjacent samples contact interface place:

$\mathrm{\ΔT}=(T_n-\frac{(T_1-T_n)}{(n-1)\·l/n}\×l/2n)-(T_{n+1}+\frac{(T_{n+1}-T_{2n})}{(n-1)\·l/n}\×l/2n)$

$=(T_n-\frac{2(T_1-T_n)}{n-1})-(T_{n+1}+\frac{2(T_{n+1}-T_{2n})}{n-1})$

Wherein, l is a specimen length, and n is a number of checkpoints on each sample, T ₁, T _n, T _N+1, T _2nThe temperature of the 1st of first tested sample of difference, a n test point, second adjacent tested sample n+1 and the temperature of 2n test point.

The 6th goes on foot, and confirms the axial hot-fluid of sample according to selected heat flow meter.

Ignore the lateral heat flow loss of sample, as heat flow meter, be prepared into the heat flow meter sample with the same size of sample with metallic copper, then axially hot-fluid is:

$q={\mathrm{\λ}}_T\frac{\mathrm{dt}}{\mathrm{dx}}={\mathrm{\λ}}_T(T_1-T_n)/m$

λ wherein _TThermal conductivity for copper; T ₁, T _nTemperature for first test point and n test point on the heat flow meter sample; M is the distance between first test point and n the test point on the heat flow meter sample.

In the 7th step, calculate contact conductane and thermal contact resistance.

According to the axial hot-fluid in the 6th step, the contact conductane h in obtaining testing _CAs follows:

$h_C=\frac{q}{\mathrm{\ΔT}}=\frac{{\mathrm{\λ}}_T(T_1-T_n)/m}{(T_n-\frac{2(T_1-T_n)}{n-1})-(T_{n+1}+\frac{2(T_{n+1}-T_{2n})}{n-1})}$

Fall Δ T according to the temperature at per two sample contact interface places and calculate thermal contact resistance R _C

Described thermal contact resistance R _CFor:

$R_C=\frac{1}{h_C}=\frac{\mathrm{\ΔT}}{q}$

Wherein q is axial hot-fluid.

According to the test needs, can adjust heating-up temperature or loading stress, repeat six steps of the first step to the and can test the thermal contact resistance under different temperatures and the stress condition.

The present invention also provides a kind of thermal contact resistance test equipment, and is as shown in Figure 1, and described testing apparatus mainly comprises support 1, top board 2, base plate 3, answers force loading device 4, data acquisition system (DAS) 6 and heating arrangement 7, also comprises a cooling device 5.Said top board 2 is horizontally fixed on four supports 1 through four groups of nuts 8 respectively with base plate 3, and top board 2 is positioned at the top of base plate 3.Space between base plate 3 and the top board 2 sets gradually heating arrangement 7, sample 9, cooling device 5 from the bottom to top and answers force loading device 4.The said force loading device 4 of answering is fixed on top board 2 centers, answers the power conductive bar of force loading device 4 to pass cooling device 5 and contacts with the top of sample 9, is used to sample 9 top loading stresses.Said base plate 3 is provided with heating arrangement 7, is used to sample 9 heating.

At least three of the quantity of described sample 9, vertically axial array, and one of them sample 9 is as the heat flow meter sample, and all the other are the material sample of thermal contact resistance to be measured.As shown in Figure 2; Arrange 4 test point thermopairs 10 (like nickelchromium-nickelsiliconthermocouple) on the axis of each sample 9; Test point thermopair 10 is used for measuring in real time along the Temperature Distribution of sample 9 on axially as temperature sensor, and the probe of test point thermopair 10 is arranged on the vertical axis of sample 9, and the buttock line of test point thermopair 10 connects data acquisition system (DAS) 6; Like Fig. 1; Temperature variation curve is stored and drawn to the temperature data that data acquisition system (DAS) 6 is gathered through computing machine 601, is shown to the operator, is convenient to operator's monitoring and control thermal contact resistance test process.

Distance relation on each sample 9 between the thermocouple probe is following: the axial distance between the adjacent heat galvanic couple equates; The length of each sample is l; From the lower surface to the upper surface, arrange n thermopair on each sample successively; Then the distance between the thermopair is l/n, and first thermopair equals the distance of n thermopair apart from the upper surface apart from the distance of lower surface, is l/2n.

Material such as the copper of selecting known heat-conduction coefficient among the present invention for use come the axial hot-fluid q of test sample as heat flow meter.Heat flow meter is made the size the same with sample 9; As one of them heat flow meter sample; During test, the top that described heat flow meter sample is arranged in test sample contacts with the power conductive bar of answering force loading device 4, and perhaps lowermost end directly contacts with heating arrangement 7; Guarantee that contact forms contact interface 901 between the alloy material sample of thermal contact resistance to be measured, testing apparatus provided by the invention is exactly the thermal contact resistance that is used to test contact interface 901 places between contacted two samples.

Described test point thermopair 10 adopts the nickelchromium-nickelsiliconthermocouple of K type, can survey 0～1300 ℃ temperature range.The present invention adopts the probe arrangement mode of test point thermopair 10 as shown in Figure 2, and probe is arranged on the vertical axis of sample 9.Specimen length is 60mm, the probe distance upper and lower end face 7.5mm of test point thermopair 10 on each sample 9, and interval 15mm arranges four thermopairs altogether each other.The processing that the probe hole of layout test point thermopair 10 is taken every caution against error on sample 9 because the small error of probe hole spacing promptly can be brought the bigger error of thermograde, and then draws the bigger uncertainty of thermal contact resistance.

Because all there is tolerance in the processing in test point thermopair 10 and thermocouple probe hole, in sample is heated the process of carrying, sample meeting expanded by heating, some test point thermopairs 10 might come off from sample aperture.For fixing test point thermopair 10; As shown in Figure 2; Buttock line with described test point thermopair 10 among the present invention passes through a stable support frame 11, shown in Fig. 2 a, buttock line hole 11A is set on the described stable support frame 11; The quantity of buttock line hole 11A equals the quantity of test point thermopair 10 on the sample; The buttock line of each test point thermopair 10 is connected with data acquisition system (DAS) 6 after all passing buttock line hole 11A, and buttock line is that mode through screw lock is fixed on the stable support frame 11, prevents that test point thermopair 10 from coming off from sample 9.

Be connected with pressure transducer 401 on the force loading device 4 said answering; Like Fig. 1; Pressure transducer 401 is connected with computing machine 601 in the data acquisition system (DAS) 6; Be used to measure the size of the compressive stress that loads, and with measured compressive stress data recording be presented on the computing machine 601 of data acquisition system (DAS) 6.Promote top boards 2 through regulating four nuts 8, make the adjustable height of top board 2, and then realize that counter stress charger 4 exerts pressure, answer force loading device 4 pressure to be imposed on the top of sample 9 through the power conductive bar.Because said power conductive bar is passed the cooling water tank of cooling device 5 and is contacted with sample.When the power conductive bar applies compressive stress for sample 9 conduction, also will realize cooling to the top of sample 9.

The structure of described top board 2 is as shown in Figure 3, and top board 2 adopts the structure of steel plate+reinforcements, and top board 2 adopted the loss of weight structure to come thin device, and parts such as test point thermopair and compensating heating device also can insert and use safely more easily.In the area that has increased top board 2, lightening hole 201 is set on top board 2 realizes loss of weight, also make more convenient operation when having alleviated the weight of charger.

Described cooling device 5 is placed on the top of sample 9; Shown in Fig. 4 a, 4b; Described cooling device 5 is a cooling water tank structure, and the center of cooling water tank is provided with central through hole 501, and the internal diameter of central through hole 501 is a bit larger tham the external diameter of power conductive bar; Described central through hole 501 has internal thread, and cooling water tank is fastened on the power conductive bar of answering force loading device 4 through said internal thread.The temperature of the chilled water that cooling water tank is inner can directly be conducted to the power conductive bar, and the temperature through the power conductive bar reduces the top cold junction that comes cooling samples 9.The cooling water tank set inside has cooling duct 502, and cooling duct 502 centers on central through hole 501 for spirality.Chilled water is from the chilled water water inlet 503 entering cooling ducts 502 of cooling water tank bottom; And flow out from the cooling water outlet at cooling water tank top 504; So circulation, chilled water is with the cooling duct 502 of certain flow velocity through cooling water tank inside, for the power conductive bar provides lower stationary temperature; Can reduce the temperature of power conductive bar, and then the top cold junction of cooling samples 9.The temperature maintenance of general recirculated cooling water gets final product at 20 ℃～25 ℃.This kind mode makes that the contact area of recirculated cooling water and sample cold junction is maximum, has improved cooling effectiveness to greatest extent.There is upper, middle and lower-ranking cooling duct 502 cooling water tank inside, and between layer and layer, the dividing plate 505 that two opening diagonal angles distribute is set, in order to guarantee that recirculated cooling water flows to the top from the bottom.Recirculated cooling water will from down and on, prevented delay.

Adopt this kind type of cooling to find in the test; After heating arrangement reaches needed hot-side temperature with the power of maximum heating (220V/1500W); Turn down voltage between 90V-120V through silicon-controlled voltage regulation device 12, after about 2-3 hour, the axial hot-fluid on the sample has reached metastable state.

Described heating arrangement 7 shown in Fig. 5 a, mainly comprises heat block 701, and heat block 701 can directly connect silicon-controlled voltage regulation device 12, and silicon-controlled voltage regulation device 12 connects temperature controller, is the sample heating; Also can connect silicon-controlled voltage regulation device 12 through pottery (SiC) cartridge heater 702 of heat block 701 outer rings or the cylinder heater 705 of a side opening, silicon-controlled voltage regulation device 12 connects temperature controller, is the sample heating.When selecting ceramic cartridge heater 702 for use; Ceramic cartridge heater 702 peripheries are wound with heater strip 703, and heater strip 703 connects silicon-controlled voltage regulation device 12, and silicon-controlled voltage regulation device 12 connects temperature controller 12A; Being used to heater strip 703 provides power controllable heating-up temperature, for sample 9 loads temperature.The heat of heater strip 703 passes to heat block 701 through ceramic cartridge heater 702, for sample 9 provides thermal source.The internal diameter of ceramic cartridge heater 702 is a bit larger tham the external diameter of heat block 701, guarantees that the heat of ceramic cartridge heater 702 can all pass to heat block 701.

The cylinder heater 705 of a described side opening is the structure shown in Fig. 5 b, promptly adopts the cylinder heater 705 of a side opening to be heat block 701 heating.Said cylinder heater 705 internal diameters closely contact with heat block 701 external diameters, and then can increase the efficiency of heating surface, shorten heat time heating time.Be designed to the structure of a side opening, help tight contact the between cylinder heater 705 inwalls and the heat block 701 more.Arrange heater strip 703 on said cylinder heater 705 inwalls, the two ends of heater strip 703 are connected to silicon-controlled voltage regulation device 12, and silicon-controlled voltage regulation device 12 connects temperature controller 12A.

Described heat block 701 structures are shown in Fig. 5 c; Heat block 701 is a cylindrical structure, and cylindrical upper surface is provided with a cylinder shape groove 701A, and groove 701A diameter is a bit larger tham sample 9 diameters; Bolt hole 701D is set around the groove 701A; After being installed to sample 9 bottoms in the groove 701A, with bolt passing through bolt hole 701D sample 9 bottoms are held out against, prevent sample 9 bottoms moving with respect to groove 701A; Simultaneously can be with the heat transferred sample 9 of heat block 701, general bolt hole 701D is provided with four.A threaded column 701B is arranged at the bottom of heat block 701, is threaded between the sheet metal of arranging on this threaded column 701B and the refractory brick 13 14, like Fig. 5 a, connects sheet metal 14 and makes the center of gravity of heat block 701 descend the firm upper surface that is positioned at refractory brick 13.Said refractory brick 13 places on the base plate 3.Described refractory brick 13 all is the effect of playing fixed heated piece 701 with sheet metal 14, and refractory brick 13 also plays the effect heat insulation and position balance of adjusting heat block 701 simultaneously.

Bottom position at heat block 701 upper groove 701A is provided with a temperature sensor 701C; Temperature sensor 701C perhaps is connected to temperature controller 12A through ceramic sleeve 702 through the opening of cylinder heater 705; Temperature sensor 701C feeds back to the measured temperature data on the temperature controller 12A; Temperature controller 12A guarantees that through the break-make of heating on the silicon-controlled voltage regulation device 12 control cylinder heaters 705 heat block 701 tip positions remain stationary temperature with heat transferred test sample 9.

Described four supports 1 all have external thread structure, and eight groups of nuts 8 can be regulated separately.Regulate four groups of fixing on the top board 2 nuts 8 and can power straight down be provided proof stress charger 4; Regulate four groups of nuts 8 of base plate 3, can guarantee that the axis of the heat block 701 on the refractory brick 13 is perpendicular to the ground.

Usually the heater strip of choosing 703 is siderochrome aluminium heater strip, like 0Cr21Al16Nb.Choose heat block 701 and adopt high-temperature alloy,, perhaps choose K417 alloy steel (high temperature resistant more than 1000 ℃) like 1Cr18Ni9Ti (600 ℃).The peak power that can provide is 1500W.Heat-insulation layer 704 (avoiding heater strip directly to contact with heat-barrier material reacts) can also be set in the outside of said ceramic cartridge heater 702, as shown in Figure 1, be used to prevent the heat dissipation of heater strip 703 and heat block 701.

Periphery at said sample 9 is provided with thermofin 16; Thermofin 16 is made up of heat-preservation cotton and perlite; Like Fig. 1, thermofin 16 is arranged on the periphery of sample 9 and heating arrangement 7, is used to prevent that the specimen surface heat laterally scatters and disappears; Guarantee that as far as possible the temperature heat on the sample 9 axially rises along sample 9, avoids the horizontal loss of hot-fluid at the interface.

In the thermal contact resistance test process, because specimen temperature transmits from bottom to top, in different temperature, hot-fluid loss transversely is inevitable at radially same graphic memory.According to the principle of dynamics of conducting heat, the temperature difference on two planes is big more, and the power that then conducts heat is just big more, when hot-fluid in axial direction maximizes, reaches the metastable state of hot-fluid one dimension transmission, and just can carry out the test of thermal contact resistance this moment.Minimizing lateral heat flow loss in order to try one's best makes hot-fluid transmit vertically, and the present invention also is provided with compensating heating device 15.Described compensating heating device 15 comprises two thermopair 15A and two ring heater 15B; As shown in Figure 6, described ring heater 15B is positioned at the sagittal plane of contact interface, respectively apart from the position of contact interface 50mm and 60mm; Fixedly install a thermopair 15A on the ring heater 15B respectively; Thermopair 15A links to each other with temperature controller 12A, gives temperature controller 12A with the Temperature Feedback of ring heater 15B, makes the temperature of sample contact interface consistent with the temperature of ring heater 15B through temperature controller 12A; The horizontal isothermal of two material contact interfaces has been avoided laterally scattering and disappearing of heat.In the process of the test through immediate two test point thermopair 10 measured temperatures on adjacent two samples are made difference and are asked average; Obtain the theory conduction temperature Δ T ' at contact interface place; According to this theory conduction temperature Δ T ', regulate the temperature control point of temperature controller 12A, ring heater 15B heating and temperature control is conducted in the temperature range in described theory; Make hot-fluid maximize, avoid lateral heat flow to scatter and disappear in the axial transmission at sample contact interface place.

Said ring heater 15B is fixed on the top board 2 through fixed support 15C, and said fixed support 15C is for falling " L " type, and the top is provided with two threaded holes 150, and shown in Fig. 6 a, screw passes said threaded hole 150 fixed support 15C is fixed on the top board 2; Bottom end vicinity is provided with slotted hole 151; Shown in Fig. 6 b; Two circular holes are arranged on the ring heater 15B; Pass said circular hole with bolt ring heater 15B is fixed on the slotted hole 151, the purpose that is processed into slotted hole is to regulate ring heater 15B position in the axial direction for ease, and then makes that ring heater 15B's is Height Adjustable.

Data acquisition system (DAS) 6 among the present invention is divided into two parts with the temperature data of being gathered; A part is all temperature datas of test point thermopair 10; Be used for computer drawing and become temperature variation curve; The steady change of test samples heating-up temperature, the temperature data according to this collection carries out resolving of thermal contact resistance then; Another part is the temperature data of two thermopairs nearest apart from the contact interface place, is used to resolve the medial temperature at sample contact interface place, so that control is for the temperature compensation at sample contact interface place.

Temperature controller 12A among the present invention can realize the independent control and the data presentation of multichannel heating, and the temperature controller 12A model of choosing among the present invention is XMZJ16-38K XLDS.

Claims (3)

1. A thermal contact resistance testing device with a compensation heating device, characterized in that: it mainly includes a support, a top plate, a base plate, a stress loading device, a cooling device, a data acquisition system, a heating device and a compensation heating device, the top board and The bottom plate is horizontally fixed on the four brackets by four sets of nuts respectively, and the top plate is located above the bottom plate, and a heating device, a sample, a cooling device and a stress loading device are sequentially arranged between the bottom plate and the top plate; the stress loading device is fixed At the center of the top plate, the force conduction rod of the stress loading device passes through the cooling device and contacts the top of the sample for loading stress on the top of the sample; the bottom plate adjusts the horizontal angle and vertical height through four sets of nuts, and the bottom plate is equipped with a heating means for heating the sample; The compensation heating device includes a thermocouple and a ring heater, and the thermocouple is arranged on the ring heater; the ring heater is arranged in a radial plane at the contact interface of every two samples; The thermocouple mentioned above is connected with the temperature controller, and the temperature controller controls the on-off of the ring heater through the temperature data fed back by the thermocouple; The number of the samples is at least three, arranged vertically and axially, and one of the samples is used as a heat flow meter sample, and the rest are test samples of the thermal contact resistance to be measured; the heat flow meter sample is located at the top or bottom end; The distance relationship between the thermocouple probes on each sample is as follows: the axial distance between adjacent thermocouples is equal; the length of each sample is l, and each sample is arranged in turn from the lower end surface to the upper end surface n If there are two thermocouples, the distance between the thermocouples is l/n, and the distance between the first thermocouple and the lower end surface is equal to the distance between the nth thermocouple and the upper end surface, both of which are l/2n. 2. The contact thermal resistance testing equipment with a compensation heating device according to claim 1, characterized in that: the annular heater is fixed on the top plate through a fixing bracket, the fixing bracket is an inverted "L" shape, and the top end There are two threaded holes, and the screws pass through the threaded holes to fix the fixing bracket on the top plate; there are grooved holes near the bottom, and there are two round holes on the ring heater, and the ring heater is fixed by bolts through the holes. The heater is fixed on the slotted hole. 3. The thermal contact resistance testing equipment with compensation heating device according to claim 1, characterized in that: the test point thermocouples are evenly arranged on the central axis of each sample, and the test point thermocouples are used as temperature sensors for real-time Measure the temperature distribution along the axial direction of the sample; the probe of the thermocouple at the test point is set on the vertical axis of the sample, and the tail wire of the thermocouple is connected to the data acquisition system.

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