CN201255727Y

CN201255727Y - Thermal conductivity measuring device

Info

Publication number: CN201255727Y
Application number: CNU2008201316618U
Authority: CN
Inventors: 陈次郎; 游本懋
Original assignee: ZHIHUI TECH CORP
Current assignee: Chroma ATE Inc
Priority date: 2008-08-06
Filing date: 2008-08-06
Publication date: 2009-06-10
Anticipated expiration: 2018-08-06

Abstract

The utility model relates to a thermal conductivity coefficient measuring device, which belongs to the electromechanical class. The measuring device measures the thermal conductivity of the preset object to be measured, the two sides of the object to be measured are respectively provided with a first contact surface and a second contact surface, the first contact surface is connected with a first heat transfer guide pillar, the second contact surface is connected with a second heat transfer guide pillar, the first heat transfer guide pillar is connected with a first temperature detector and a second temperature detector, the second heat transfer guide pillar is connected with a third temperature detector and a fourth temperature detector, the first heat transfer guide pillar is connected with a heater, the second heat transfer guide pillar is connected with a refrigerating chip, the refrigerating chip is connected with a radiator, and the refrigerating chip is connected with a controller. Has the advantages that: the heat balance is very fast, and any reasonable temperature setting can complete the measurement within 1-3 minutes; the temperature of the object to be measured can be accurately controlled within 0.1 ℃, and the temperature can be set at will and accurately and rapidly achieved.

Description

The thermal conductivity coefficient measuring equipment

Technical field

The utility model relates to electrical category, particularly a kind of thermal conductivity coefficient measuring equipment.

Background technology

As everyone knows, heat energy is a kind of relational expression of temperature, when certain material has higher temperature, represent its energy that has just high more, heat conduction is because the difference of temperature, cause heat energy in single object or between several objects, mutually exchange is when two parts of a material distinctly remain on different temperature, the material Transfer of energy between these two parts then, and when the temperature of two objects not simultaneously, do not participate in if there are other physical mechanisms, for example thermoelectric effects, then the transmission of heat energy all be from temperature high conduct to the low place of temperature, that is to say that heat all is that this kind conduction phenomenon just is called heat conduction by the cold position of passing to of heat.

Heat conduction is under the unit temperature difference, unit interval is by the heat of unit area unit distance, the heat-conduction coefficient (Thermal Conductivity) that is called this material, if with thickness L, the determinand of contact area A measures, and bestows the heat Q of unit interval, measured temperature difference △ T, then the heat-conduction coefficient of this speciality is remembered into k usually, and it can be expressed as k=(Q * L)/(A * △ T).

When measuring, determinand must remain on a thermal equilibrium, recording temperature difference △ T does not change in time, it is correct calculating gained heat-conduction coefficient side, shown in accompanying drawing 1 and accompanying drawing 2, measuring equipment 11 commonly used includes determinand 11, determinand 11 both sides are respectively equipped with first surface of contact 111 and second surface of contact 112, first surface of contact 111 is connected with the first heat conduction post 12, second surface of contact 112 is connected with the second heat conduction post 13, the first heat conduction post 12 is connected with first temperature detector 121 and second temperature detector 122, the second heat conduction post 13 is connected with the 3rd temperature detector 131 and the 4th temperature detector 132, and wherein the first heat conduction post 12 is connected with well heater 14, the second heat conduction posts 13 and is connected with water-cooled 15, water-cooled 15 is connected with water pipe 151, and water pipe 151 is connected with frozen water machine 16;

Its principle is that well heater 14 per seconds produce known heat Q, this heat Q conducts to determinand 11 via the first heat conduction post 12, produce temperature difference △ T through determinand 11, again through the second heat conduction post 13, mediate by water-cooled 15 at last, and 4 temperature detectors 121,122,131,132 respectively measure T1, T2, T3, the temperature value of T4, according to indivedual thermometers that can draw in the position of the first heat conduction post 12 and the second heat conduction post 13, again T1 and T2 point are done the straight line extension, can extrapolate first surface of contact, 111 temperature T h with determinand 11 first surface of contact 111 confluces, in like manner T3 and T4 are done the straight line extension, can extrapolate second surface of contact, 112 temperature T c with determinand 11 second surface of contact 112 confluces, 11 liang of surface of contact temperature difference of determinand △ T=Th-Tc thereby can extrapolate;

Moreover, extrapolate △ T after, because of determinand 11 thickness L and contact area A are known, Q is also known for the conduction heat, so its thermal conductivity coefficient k=(Q * L)/(A * △ T) can calculate and learn.

But above-mentioned measuring equipment 11 is in use, still has following point:

One, thermal conductivity coefficient must measure under the thermal equilibrium situation, being that T1～4 are all stable does not change in time, but it is very of a specified duration when Water Cooling Technology commonly used reaches the thermal equilibrium palpus, with universal experience, approximately must 5～10 minutes after 16 temperature balances of frozen water machine, frozen water machine 16 temperature if do not reach balance in addition must the time more than 30 minutes;

Two, the thermal conductivity coefficient of determinand 11 is real is temperature funtion, with determinand 11 temperature variation, if desiring to finish complete heat-conduction coefficient measures, must be set under the condition of different temperatures and measure, common technology is slow except measurement speed, and temperature controls also that difficulty precisely is controlled at 1 ℃ below the error, do measurement under specified temp, adjustment is difficult for, and transformation temperature is more consuming time arbitrarily;

Three, because of using frozen water machine 16, volume is big, and maintenance operation is trouble, need be improved.

The utility model content

The purpose of this utility model is to provide a kind of thermal conductivity coefficient measuring equipment, and having solved measuring equipment commonly used, to measure speed slow, and temperature controls also that difficulty precisely is controlled at 1 ℃ below the error, do measurement under specified temp, adjusts to be difficult for, and it is more consuming time to change temperature arbitrarily; And volume is big, and maintenance operation is than problems such as troubles.

The technical solution of the utility model is: measuring equipment can be for the thermal conductivity coefficient that measures default determinand, these determinand both sides are respectively equipped with first surface of contact and second surface of contact, first surface of contact is connected with the first heat conduction post, second surface of contact is connected with the second heat conduction post, the first heat conduction post is connected with first temperature detector and second temperature detector, the second heat conduction post is connected with the 3rd temperature detector and the 4th temperature detector, the first heat conduction post is connected with well heater, the second heat conduction post is connected with cooling wafer, this cooling wafer is connected to heating radiator, and this cooling wafer is connected with controller, the user can be by controller with the control cooling wafer, by said structure, make the effect that the utility model can reach thermal equilibrium fast and can accurately adjust temperature;

Wherein, controller is the control output instrument that is the feedback signal according to first temperature detector, second temperature detector, the 3rd temperature detector, the 4th temperature detector one of them or a plurality of temperature detector value.

Advantage of the present utility model is: it is very quick to reach thermal equilibrium, and any reasonable temperature is set all can finish measurement in 1～3 minute; Can precisely control the determinand temperature and reach in 0.1 ℃, and design temperature is precisely reached fast arbitrarily; This measuring equipment volume is little, and maintenance operation is easy.

Description of drawings:

Fig. 1 is the embodiment synoptic diagram of thermal conductivity coefficient measuring equipment commonly used;

Fig. 2 is a thermometer of the present utility model;

Fig. 3 is an embodiment synoptic diagram of the present utility model;

Fig. 4 is an action synoptic diagram of the present utility model.

Embodiment:

As shown in Figure 3, the utility model measuring equipment 22 can be for the thermal conductivity coefficient that measures default determinand 21, these determinand 21 both sides are respectively equipped with first surface of contact 211 and second surface of contact 212, wherein, first surface of contact 211 is connected with the first heat conduction post, 22, the first heat conduction posts 22 and is connected with first temperature detector 221 and second temperature detector 222; Second surface of contact 212 is connected with the second heat conduction post 23, the second heat conduction post 23 is connected with the 3rd temperature detector 231 and the 4th temperature detector 232, the first heat conduction post 22 is connected with well heater 24, the second heat conduction post 23 is connected with cooling wafer 25, this cooling wafer 25 is connected to heating radiator 26, this cooling wafer 25 can be for the heat flux of regulating the first heat conduction post 22 and the second heat conduction post 23 rapidly, and the input of the electric current of cooling wafer 25 is connected with controller 27, the user can be by controller 27 with control cooling wafer 25, and this controller 27 can be according to first temperature detector 221, second temperature detector 222, the 3rd temperature detector 231, the control output instrument that the 4th temperature detector 232 one of them or a plurality of temperature detector value are the feedback signal.

Shown in accompanying drawing 2 and accompanying drawing 4, when measurement device 22 measures the thermal conductivity coefficient of determinand 21, its principle is that well heater 24 per seconds produce known heat Q, heat Q via the first heat conduction post 22 to determinand 21, produce temperature difference △ T through determinand 21, the second heat conduction post 23 of transmitting scriptures again, this second heat conduction post 23 is connected with cooling wafer 25, cooling wafer 25 is connected to heating radiator 26, cooling wafer 25 can be regulated the heat flux of the first heat conduction post 22 and the second heat conduction post 23 rapidly and finally through heating radiator 26 heat be discharged, and four temperature detectors 221,222,231,232 can measure respectively T1, T2, T3, the temperature value of T4, again according to 4 temperature detectors 221,222,231,232 thermometers that can draw in the position of the first heat conduction post 22 and the second heat conduction post 23, again T1 and T2 point are done the straight line extension, can extrapolate first surface of contact, 211 temperature T h with determinand 21 first surface of contact 211 confluces, in like manner T3 and T4 are done the straight line extension, can extrapolate second surface of contact, 212 temperature T c with determinand 21 second surface of contact 212 confluces, 21 liang of surface of contact temperature difference of determinand △ T=Th-Tc, thereby can extrapolate; After extrapolating △ T, because of determinand 21 thickness L and contact area A are known, Q is also known for the conduction heat, so its thermal conductivity coefficient k=(Q * L)/(A * △ T) can calculate and learn.

Wherein, because thermal conductivity coefficient must measure under the thermal equilibrium situation, the temperature when T1～4 does not change in time for stable, just is thermal equilibrium, and it is very quick that the utility model reaches thermal equilibrium, but rapid measuring; The utility model is owing to be provided with controller 27 with control cooling wafer 25, and can pass through the feedback of T1, T2, T3, T4, controller 27 can give cooling wafer 25 suitable output, and the temperature of determinand 21 is controlled at setting value, reach the purpose that measures determinand 21 heat-conduction coefficient at design temperature; Only utilized cooling wafer 25, heating radiator 26 and control 27, dwindled volume, added cooling wafer 25 for being swift in response, regulating easy temperature control element, so can obtain more accurate temperature, maintenance operation is also easy.

Claims

1, a kind of thermal conductivity coefficient measuring equipment, measuring equipment measures the thermal conductivity coefficient of default determinand, these determinand both sides are respectively equipped with first surface of contact and second surface of contact, first surface of contact is connected with the first heat conduction post, second surface of contact is connected with the second heat conduction post, the first heat conduction post is connected with first temperature detector and second temperature detector, the second heat conduction post is connected with the 3rd temperature detector and the 4th temperature detector, the first heat conduction post is connected with well heater, it is characterized in that: the second heat conduction post is connected with cooling wafer, this cooling wafer is connected to heating radiator, and this cooling wafer is connected with controller.

2, thermal conductivity coefficient measuring equipment according to claim 1 is characterized in that: described controller is the control output instrument that is the feedback signal according to first temperature detector, second temperature detector, the 3rd temperature detector, the 4th temperature detector one of them or a plurality of temperature detector value.