阅读说明：本技术 对称多线瞬态热带固体高导热系数测试装置 (Symmetrical multi-thread thermal transient band solid high thermal conductivity coefficient test device ) 是由 孙毅 时建捷 郭清华 于 2018-05-16 设计创作，主要内容包括：本发明涉及材料导热系数测试技术领域,尤其涉及高导热系数固体材料的导热系数和热扩散系数测量装置。本发明公开了一种对称多线瞬态热带加热膜大导热系数固体材料的导热系数和热扩散系数测量装置,包括,由多线构成的八个加热电阻构成的加热片、电源以及数据采集系统。解决了现有稳态导热系数测试技术测试时间过长,以及现有瞬态导热系数测试技术因为模型限制导致信噪比不高,在测试,尤其是高导热系数材料测试过程中重复性不好的问题。(The present invention relates to material thermal conductivity the field of test technology more particularly to the thermal coefficients and thermal diffusion coefficient measuring device of high thermal conductivity coefficient solid material.The invention discloses a kind of symmetrical thermal coefficient and thermal diffusion coefficient measuring device of the multi-thread thermal transient with the big thermal coefficient solid material of heating film, including, heating sheet, power supply and the data collection system being made of multi-thread eight constituted adding thermal resistance.It solves that the existing steady heat conduction coefficient measuring technology testing time is too long and existing transient heat conduct coefficient measuring technology is because model limitation causes signal-to-noise ratio not high, is testing, the bad problem of repeatability especially in high heat conductive material test process.)

1. a kind of measuring device of the thermal coefficient of solid high heat conductive material, which is characterized in that including by eight heating electricity The heating sheet constituted is hindered, which includes: 4 composition internal resistances (dash area), and 4 are non-essential resistances, every 1 resistance For 4 torrid zone compositions；

Power supply, for providing constant energy for two nodes opposite in the heating sheet；

Data collection system is connected to the heating sheet, and for acquiring other two opposite nodes in the heating sheet Voltage and temperature change, and obtain the thermal coefficient of the detected materials.

2. measuring device as described in claim 1, which is characterized in that the spacing between heater wire is 0.1 ± 0.05mm.

3. measuring device as described in claim 1, which is characterized in that heating line width is the 2 times or more of spacing.

4. measuring device as described in claim 1, which is characterized in that the power supply is the electricity of constant current, constant pressure or invariable power Source.

5. a kind of method using measuring device measurement solid-state highly heat-conductive material thermal coefficient described in claim 1, feature It is, comprising:

Heating sheet is placed among two detected materials；

Record the humidity and temperature of detected materials type and environment；

Load constant-current source, constant pressure source or constant power source；

Data are acquired and handled, the thermal coefficient of the detected materials is obtained.

Technical field

The present invention relates to material thermal conductivity the field of test technology more particularly to the thermally conductive systems of high thermal conductivity coefficient solid material Several and thermal diffusion coefficient measuring device.

Background technique

As the important physical parameter of substance, material thermal conductivity and thermal diffusion coefficient, in chemical industry, material, the energy, power There is important purposes with fields such as Refrigeration Engineerings, is essential basic data in many industrial flows and product design. With the fast development of modern industry, the measurement of the thermal coefficient and thermal diffusion coefficient of solid material is increasingly subject to the weight of people Depending on.

The thermal coefficient and thermal diffusion coefficient of substance can pass through the methods of experiment measurement, theoretical reckoning or computer simulation It obtains, but at present still based on experiment measurement.According to the experiment measuring principle of thermal coefficient, measurement method substantially can be with It is divided into steady state method and cold store enclosure.

Steady state method refer to when on sample Temperature Distribution stablize, i.e., the Temperature Distribution in sample be do not change over time it is steady Fixed temperature field, the method for flowing through the parameters such as heat and the temperature gradient of sample by measurement to determine the thermal coefficient of sample.

The characteristics of steady state method is that experimental principle is simple, however the steady state method needs accurately one-dimensional hot-fluid, it usually needs attached If thermal compensation device；Need to arrange multiple temperature points simultaneously to obtain uniform Temperature Distribution；Therefore experimental provision is electrical Control and adjusting circuit are more complicated；Furthermore it Test Cycle and is tested required for preparing, all than relatively time-consuming and to ring Border requirement is harsher, and steady state method mainly includes guarded-plate method, heat-flow meter method, round tube method etc..

Cold store enclosure refers to that specimen temperature changes over time in experiment measurement process, passes through the temperature of certain points in measurement sample Situation of change and other relevant parameters are spent, so that it is determined that the method for the thermal coefficient of sample；This method time of measuring is short, essence True property is higher, low to environmental requirement, but also due to limited by measurement method itself, is chiefly used in heat conducting coefficient measuring and tends to be normal Several substances mainly has transient hot wire technique, Hot-strip Method, normal power heat source method, laser flash method etc..

Transient state Hot-strip Method and the measuring principle of transient hot wire technique are very similar, take the identical sample to be tested of two block sizes, In A very thin sheet metal is sandwiched between the two, it is as tropical, apply constant heating power on the torrid zone, as constant heat source, The temperature change in the torrid zone can be obtained by the variation of the upper resistance in the measurement torrid zone, can also directly be measured with thermocouple.Further The variation relation of the available upper temperature and time in the torrid zone, is obtained with thermal coefficient according to its principle relational expression.This side Method makes the torrid zone can be very good to contact with detected materials, meanwhile, solid material can be preferably measured compared with than heat-pole method Thermal coefficient, heat-pole method are mainly used for having bigger advantage in terms of measuring gas or fluent material thermal coefficient.

Tropical cross sectional dimensions used in Hot-strip Method heat conducting coefficient measuring is 4 × 0.008mm², selected by metal material The resistivity of material is 5 × 10^-3, the size of detected materials is 80 × 50 × 15mm³.In order to make have very between detected materials and the torrid zone Good thermo-contact, needs to add the relatively low oil of some viscosity in their contact surfaces.

In addition, occurring former piece type plane heat source method in recent years, principle is approximate with transient state Hot-strip Method, and difference is length-width ratio to see It is transformed into discoidal flat heat source at the torrid zone of near infinite.

Transient state Hot-strip Method and heat-pole method and plane heat source method because its test process signal-to-noise ratio is low leads to test repeatability Difference, this problem is especially prominent in terms of big thermal coefficient, precision can only be improved by repeatedly testing, but this raising is smart The raising of precision in big thermal coefficient material testing procedures of the method for degree is obtained by the square root of pendulous frequency, because of material Thermal coefficient is higher, and the testing time for needing to carry out is also more, it is possible to which more to user is difficult to endure.

In short, there is an urgent need to develop one kind can be easy to operate and to select difference by those skilled in the art at present The instrument of the thermal coefficient of the big thermal coefficient solid material of mode precise measurement.

Summary of the invention

The object of the present invention is to provide a kind of easy to operate and the energy big thermal coefficient solid material of precise measurement thermally conductive systems Several and thermal diffusion coefficient measuring device.

In order to achieve the above objectives, the invention discloses a kind of thermally conductive systems of symmetrical multi-thread big thermal coefficient solid material of transient state Several and thermal diffusion coefficient measuring device, including, the heating sheet being made of multi-thread eight constituted adding thermal resistance；

Power supply, for providing constant energy for two nodes opposite in the heating sheet；

Data collection system is connected to the heating sheet, and for acquiring other two opposite nodes in the heating sheet Voltage and temperature change, and obtain the thermal coefficient of the detected materials.

Further, every group of torrid zone line spacing for constituting 8 resistance is 0.1 ± 0.05mm.

Further, every group of torrid zone line width for constituting 8 resistance is the 2 times or more of line spacing.

Further, the power supply is the power supply of constant current, constant pressure or invariable power.

In order to achieve the above objectives, the invention also discloses a kind of thermal coefficients of solid-state material and thermal diffusion coefficient measurement side Method, comprising:

Above-mentioned heating sheet is placed among two detected materials；

Record the humidity and temperature of detected materials type and environment；

Load constant-current source, constant pressure source or constant power source；

Data are acquired and handled, the thermal coefficient of the detected materials is obtained.

Compared with prior art, the invention has the following advantages that

Firstly, measuring device of the invention can measure the thermal coefficient of various different materials in a short period of time, measurement Thermal coefficient range be 10 ~ 400 W▪, and the uncertainty of measured thermal coefficient is within 5%, and It can be good at measuring thermal diffusion coefficient；

Secondly, the present invention using constant voltage/constant current/constant power source heat conducting coefficient measuring principle is prepared by using metal material Heater strip composition in the form of Wheatstone bridge arrange heating sheet, when two detected materials compress the heating sheet, lead to The voltage and temperature change for measuring the opposite node in centre two of the Wheatstone bridge are crossed, measuring principle according to the present invention obtains The thermal coefficient of detected materials out；This method is simple, easy to operate, and the range -30 of temperature change when measurement⁰C—1000⁰C it It is interior；

Furthermore on the basis of the transient state Hot-strip Method of the prior art, symmetrical transient Hot-strip Method is developed, measuring temperature in Hot-strip Method Signal is converted into measurement resistance/voltage signal, and symmetrically tropical device, constant pressure source transient state are symmetrical for thus obtained constant-current source transient state The symmetrical tropical device of tropical device and constant power source transient state, which can quickly and the high-precision big thermal coefficient of measurement is solid The thermal coefficient of body material, and greatly reduce cost of manufacture.

Detailed description of the invention

Fig. 1 is the structure chart for the heating sheet that measuring device of the present invention includes；

Fig. 2 is the enlarged diagram of the local E-E in Fig. 1 of the invention；

Fig. 3 is the enlarged diagram of the local F-F in Fig. 1 of the invention；

Fig. 4 is the schematic equivalent circuit of heating sheet of the invention；

Fig. 5 is the decomposition diagram of measuring device of the invention；

Fig. 6 is the experiment curv figure of the embodiment of measuring device heat conducting coefficient measuring of the invention.

Specific embodiment

Solid material heat conductivity measuring device of the invention is further illustrated with reference to the accompanying drawings and examples.

Thermal coefficient is important one of the thermophysical property of material, and the thermal coefficient of material is characterization heat conducting material physical property Important parameter, have very important theoretical and engineering application value to its precise measurement.Since thermal coefficient is with substance Ingredient and structure change are more, experimentally determine that material thermal conductivity almost becomes unique way of research substance thermal coefficient Diameter.

Thermal coefficient is the physical quantity for reflecting material conducts heat capacity of water, and also referred to as thermal conductivity, unit is.

Core of the invention design is the measuring device for the measurement solid material heat conductivity established using Hot-strip Method, i.e., Symmetrical multi-thread transient state Hot-strip Method, measures detected materials in conjunction with constant-current source, constant pressure source or constant power source, using of the invention Heating sheet, establishes the measurement method of new solid material heat conductivity and thermal diffusion coefficient, and this method can be when very short The thermal coefficient of interior measuring metallic materials, the range of heat conducting coefficient measuring is 10 ~ 400, and the uncertainty measured exists Within 5%.