CN113376207A - Over-and-under type coefficient of heat conductivity test instrument of constant temperature basin - Google Patents
Over-and-under type coefficient of heat conductivity test instrument of constant temperature basin Download PDFInfo
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- CN113376207A CN113376207A CN202110628948.1A CN202110628948A CN113376207A CN 113376207 A CN113376207 A CN 113376207A CN 202110628948 A CN202110628948 A CN 202110628948A CN 113376207 A CN113376207 A CN 113376207A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention discloses a lifting type heat conductivity coefficient testing instrument of a constant-temperature water tank, and aims to adopt an automatic lifting device to enable the lifting type heat conductivity coefficient testing instrument to be convenient to take and place during testing, to more conveniently control the temperature difference between a cold plate and a hot plate in the testing process by adopting a constant-temperature water tank mode, to further ensure that heat flow is uniformly transmitted in a test piece, and to measure the flow and the temperature of a water inlet and a water outlet of a core part of the cold plate, so that the heat taken away by water is obtained, the power for one-dimensional steady state of the test piece is more accurate when the heat conductivity coefficient is calculated, the testing result is more accurate, and the automation of the instrument is improved. To further enable better birth of the measured results, an aesthetically pleasing visualization interface is also provided with the LABVIEW. The test instrument can accurately measure the heat conductivity coefficient of the test piece, and is simple and convenient to operate.
Description
Technical Field
The invention relates to the field of heat conductivity coefficient test instruments for materials, in particular to a lifting type heat conductivity coefficient test instrument for a constant-temperature water tank.
Background
The heat conductivity coefficient is a key parameter of the performance of the heat-conducting material, and refers to the heat transferred by the unit area of the material in a certain time under the condition of stable heat transfer. Generally, the higher the thermal conductivity, the better the performance, so it is important to determine the thermal conductivity of the material in order to obtain various performance parameters of the material to accurately locate the specific application of the material.
At present, the heat conductivity coefficient is obtained by a theoretical method and a test method. The theoretical method for obtaining the heat conductivity coefficient is mainly obtained by analyzing each composition and proportion of the material and establishing a prediction model of the heat conductivity coefficient. The heat conductivity coefficient obtained by the test method is mainly measured by setting up an experiment platform according to the heat conduction principle to carry out tests. The acquisition of the heat conductivity coefficient of the material is mainly measured by a test platform built by a heat conduction principle, and in the test process, the temperature change of a cold plate is unstable, so that the heat conductivity coefficient of the material under a high-temperature condition cannot be accurately researched, the heat dissipation condition cannot be avoided during the test, but the heat loss cannot be accurately calculated, and the accuracy of the test result is low. And the test piece can only be manually lifted up by lifting the pressing plate during the measurement process, and the automation degree is not high.
Aiming at the prior technical problem, a test instrument which has high automation degree, keeps the temperature of a cold plate stable, can reduce the problem of test heat dissipation and can accurately detect the heat conductivity coefficient of a material under the high-temperature condition is urgently needed to be designed.
Disclosure of Invention
The invention aims to provide a lifting type heat conductivity coefficient testing instrument of a constant-temperature water tank, which ensures that the temperature of a cold plate is constant through the constant-temperature water tank, and improves the testing precision and the automation degree by calculating the heat dissipated in the testing process and automatically lifting a pressing plate.
In order to achieve the purpose, the invention provides the following technical scheme that the device comprises a screw rod, a pressing plate, a pressure sensor, a heat insulation layer, a cold plate, a silica gel sheet, a test piece, a heating plate, a protective hot plate, a back plate, a lifting device, a measurement and control device, a motor, a constant-temperature water tank, a power supply plate, universal wheels, support columns, a support column and a clamping mechanism arranged on the support column.
Preferably, the pull screw, the pressing plate and the pressure sensor are used for applying pressure to a test piece in the test process and detecting the pressure applied to the test piece.
Preferably, the heat-insulating layer is made of silicic acid ceramic fibers, so that the heat-insulating and fireproof effects are achieved, and the heat loss in the test process can be reduced better.
Preferably, the cold plate is made of a soaking plate made of copper and an aluminum alloy plate with a groove shaped like a Chinese character 'hui' in the cold plate, and connectors with threads are arranged on two sides of the cold plate. The copper that adopts the copper preparation is put homogeneity and the heat conduction effect of assurance temperature that one side of test piece can be better, adopts the aluminum alloy plate of the recess of returning the font, can make discharge take away more heats to guarantee the homogeneity of cold drawing temperature. And the heat of the water dissipated from the hot plate is calculated, so that the energy consumed by heating the hot plate is obtained, the power generation efficiency in the heat conductivity coefficient calculation process is more accurate, and the accuracy of data is improved.
Preferably, the upper surface and the lower surface of the test piece are both adhered with heat-conducting silica gel sheets, and the heat-conducting silica gel sheets are self-adhesive, can be well adhered to the test piece and can fill up unevenness of the upper surface and the lower surface of the test piece, so that the contact between the test piece and the hot plate and the cold plate is ensured. The material also has high electrical insulation and good temperature resistance, and can meet the test requirements.
Preferably, the hot plate and the protective plate are uniform cubes and are connected into a whole to be positioned on the same plane, a gap exists between the protective plate and the hot plate, and heat insulation is carried out by adopting a heat insulation material so as to reduce heat loss. The hot plate and the guard plate are internally embedded with a resistance wire shaped like a Chinese character 'hui', so that the uniformity of the guard plate and the hot plate is ensured.
Preferably, the back plate is made of an aluminum plate, and a resistance wire with a shape like a Chinese character hui is arranged in the back plate, so that the back plate is uniformly heated, and the heat loss of the lower side surface of the hot plate is reduced.
Preferably, the lifting device is driven by an electric device, when the test piece needs to be replaced, the clamping device at the upper end is pulled down, and then the lifting device can be lowered by pressing the switch, so that the test piece is replaced.
Preferably, the measurement and control device is composed of a data measurement device and a control device, the temperature measurement is carried out by adopting a K-type thermocouple wire, the NI9213 and NI3263 data acquisition modules and the NI9189 case are used for acquiring, and then the software written by LABVIEW is used for controlling and storing data, so that the automation degree of the test can be efficiently improved.
Preferably, the constant-temperature water tank mainly comprises a water inlet valve, a water discharge valve, a temperature control system, a compressor, a stirrer and a heat preservation device. The control system of the constant-temperature water tank adopts an AT89C51 singlechip, uses closed-loop control, detects the temperature by a contact sensor DS18B20, and has the advantages of low cost, small volume, light weight and accurate and stable control. The constant temperature can be guaranteed to the temperature of constant temperature basin drain valve, has further guaranteed the homogeneity of inflow cold drawing temperature.
Preferably, the universal wheel is a polyurethane trundle, adopts double bearings, has the functions of wear resistance, static performance, strong bearing capacity and the like, is symmetrically arranged four, and can ensure the convenience of movement of the test device.
Preferably, the shell adopts transparent high temperature resistant acrylic plate, can play the isolated effect with ambient temperature, can also see the test process constantly. The invention has the advantages that
Compared with the prior art, the invention has the beneficial effects that: the lifting type thermal conductivity testing instrument of the constant-temperature water tank can enable a tester to replace a test piece more conveniently, and greatly improves the automation level and the testing precision of a machine; a constant-temperature water tank is adopted to supply water to the cold plate, so that the temperature gradient of the hot plate and the cold plate can be ensured when the influence of temperature on the heat conductivity coefficient of the material is researched; the flow meter probe and the temperature sensor are arranged at the water inlet of the core part of the cold plate, so that the heat taken away by water can be calculated, the power when the heat conductivity coefficient is calculated is more accurate, and the precision of the heat conductivity coefficient measurement is greatly improved.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic diagram of the front structure of the housing according to the present invention;
FIG. 3 is a schematic cross-sectional view of a cold plate according to the present invention;
FIG. 4 is a schematic cross-sectional view of a heat plate and a shield according to the present invention.
FIG. 5 is a schematic cross-sectional view of a back plate according to the present invention
FIG. 6 is a schematic view of a clamping structure according to the present invention
FIG. 7 is a schematic view of a thermostatic water bath according to the present invention
FIG. 8 is a block diagram of a system for controlling a constant-temperature water tank according to the present invention
In the figure: 1. a screw rod, 2, an upper transverse plate, 3, a pressing plate, 4, a fixing screw, 5, a cold plate, 6, a cold plate water inlet, 7, a test piece, 8, an observation plate, 9, a heat protection plate, 10, a heat preservation insulating layer, 11, a back plate, 12, a connecting shaft, 13, a motor, 14, a motor supporting seat, 15, a constant-temperature water tank water outlet, 16, a power supply device, 17, a base, 18, a universal wheel, 19, a constant-temperature water tank water inlet, 20, a lifting platform bottom plate, 21, a measurement and control device, 22, a middle screw rod, 23, a lifting mechanism, 24, a lifting mechanism upper flat plate, 25, a heat preservation insulating layer, 26, a heat preservation insulating layer, 27, a silica gel sheet, 28, a cold plate water outlet, 29, a clamping mechanism, 30, a pressure sensor, 31, a supporting column, 32, a fixing screw, 33, a PC, 34, a shell, 36, a central cold plate water inlet temperature sensor, 37 and a central water outlet temperature sensor, 38. the device comprises a central cold plate water outlet, 39, a cold plate water outlet, 40, a central cold plate water outlet flow meter probe, 41, an intermediate heat preservation insulating layer, 42, a central cold plate water inlet flow meter probe, 43, a central cold plate water inlet, 44 heating resistance wires, 45, a protective plate, 46, a hot plate, 47, a heat preservation insulating layer, 48, a water inlet valve, 49, a stirrer, 50, a compressor, 51, a heating pipe, 52, a drain valve, 53, a temperature sensor, 54, a display panel, 55, heat preservation layer filling, 56 and a constant temperature water tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides a technical solution: a lifting type heat conductivity coefficient testing instrument of a constant-temperature water tank comprises a lead screw 1, a lead screw 2, an upper transverse plate 3, a pressing plate 4, a fixing screw 5, a cold plate 6, a cold plate water inlet 7, a test piece 8, an observation plate 9, a heat protection plate 10, a heat insulation layer 11, a back plate 12, a connecting shaft 13, a motor 14, a motor supporting seat 15, a constant-temperature water tank water outlet 16, a power supply device 17, a base 18, a universal wheel 19, a constant-temperature water tank water inlet 20, a lifting platform bottom plate 21, a measurement and control device 22, a middle screw rod 23, a lifting mechanism 24, a lifting mechanism upper flat plate 25, a heat insulation layer 26, a heat insulation layer 27, a silica gel sheet 28, a cold plate water outlet 29, a clamping mechanism 30, a pressure sensor 31, a supporting column 32, a fixing screw 33, a PC machine 34, a shell 36 and a central water inlet temperature sensor, 37. the central cold plate water outlet temperature sensor 38, the central cold plate water outlet 39, the cold plate water outlet 40, the central cold plate water outlet flow meter probe 41, the intermediate heat preservation insulating layer 42, the central cold plate water inlet flow meter probe 43, the central cold plate water inlet 44, the heating resistance wire 45, the guard plate 46, the hot plate 47, the heat preservation insulating layer 48, the water inlet valve 49, the stirrer 50, the compressor 51, the heating pipe 52, the drain valve 53, the temperature sensor 54, the display panel 55, the heat preservation layer filling and the like.
The shell 34 is opened with observation oral plate 8 in two directions in the front and back, is connected observation board and shell 8 through the hinge, and shell 34 is connected through setting up the locating stud on elevating system bottom plate 20 with elevating system bottom plate 20 to set up the temperature display module on the shell, make things convenient for the experimenter to read experimental data at any time, experimental used PC 33 places on the shell.
Go up diaphragm 2 and fix on the instrument through two extension support columns 31, lead screw 1 is connected with last diaphragm 2, and 1 has clamp plate 3, pressure sensor 30, fixed screw 4 on the lead screw, and fixed screw 4 welds on cold drawing 5 through the welded mode, exerts pressure through rotatory lead screw 1 to pass to pressure sensor 30 through clamp plate 3, thereby read out the pressure size that the sample of test piece received.
The cold plate 5 is the core part of cold drawing in the middle of, and font is returned in cold drawing all around, has the aluminium alloy plate preparation of the recess of font back by the soaking plate of copper preparation and inside, and the mid portion of cold plate 5 is inside to be equipped with back font helicla flute, all is equipped with the screw hole in the both sides that are close to the support column for be connected with clamping device, clamping mechanism 29 one end adopts the form of snap ring to fix on two support columns 31, when needing to change the test piece, presses down clamping mechanism 29, plays fixed effect promptly. And the other two sides are provided with threaded joints, and the two ends of the joints are respectively provided with a flowmeter probe 40 and a temperature sensor probe 36 which are used for detecting the flow and the temperature of water flowing into the central cold plate, so that the heat taken away by the water, namely the heat used in the heating process, is calculated, and the accuracy of the heat conductivity coefficient test value is further improved. The flow meter used was a doppler ultrasonic flow meter. Let the flow rate of the water inlet be Q1The flow of the water outlet is Q2Temperature T of water inlet1Temperature T of water outlet2The method comprises the following steps of heating power phi of a hot plate, density of water rho, heat conductivity coefficient lambda of a test piece, thickness delta of the test piece, specific heat capacity c of water, temperature difference delta T between the upper surface and the lower surface of the test piece, test area A of a material and time for a system to reach stability T.
Calculation formula of thermal conductivity coefficient before improvement:
the calculation formula of the thermal conductivity coefficient after improvement is as follows: phi' ═ cm delta t,
Δt＝T2-T1
through the improved compensation of the power, the calculated power tends to be used for heat transfer, so that the test result is more accurate, and the test error is reduced.
The silica gel piece 27 is a high-thermal-conductivity material, has slight self-adhesion, can be attached to the heat protection plate 9 and the cold plate 5, has a high compression ratio, can fill up grooves and gaps on the surface of the asphalt mixture, has high electrical insulation and good temperature resistance, and can complete heat transfer from the heater to the test piece and from the test piece to the surface of the cold plate.
The hot plate 46 is a square plate with 100 × 100mm, which is made of copper, and has a resistance wire with a shape of a Chinese character hui inside, so as to ensure the uniformity of heating, and 8 guard plates 45 with labyrinth resistance wires inside are arranged around the hot plate. There is the interval between backplate 45 and the hot plate 46, adopts the heat preservation insulating layer 47 to insulate against heat to reduce thermal loss, its hot plate 46 and backplate 45 pass through the non-metallic material of insulating high temperature resistance and connect as an organic whole, have guaranteed that the material can be stable carry out heat transfer.
The back plate 11 is to solve the problem that the lower half part of the hot plate transfers heat downwards, and to prevent heat dissipation, the back plate is arranged below the heat insulation layer to solve the problem, so that the direction of heat flow generated by the hot plate is only one-dimensional conduction towards one direction, and because the set temperature of the hot plate and the set temperature of the back plate are the same, no heat conduction exists between the hot plate and the back plate. The inside of the lifting platform is also provided with a resistance wire shaped like a Chinese character 'hui', so that the heating is uniform, and the back plate of the lifting platform is provided with an insulating layer through the middle part, so that the lifting platform is fixed above the lifting platform.
The power supply device 16 selects a GPD-4303S programmable direct current power supply and an open weft NES-350-36 direct current switch power supply. The GPD-4303S programmable direct current power supply supplies power to the hot plate, not only can feed back the output voltage and current value in real time, but also can control the output voltage and current value through a Lab VIEW program, thereby realizing the purpose of automatic temperature control. The clear weft NES-350-36 direct current switch power supply supplies power to the guard plate and the back plate, the single group of power supply has the output power of 350W, the output voltage of 36V, the voltage precision of +/-1.0 percent and the output current of 0-9.7A, the switch power supply is provided with an electromagnetic filter circuit, and the influence of electromagnetic interference (EMI) generated by the power supply on a temperature acquisition module, an electronic instrument and the like can be inhibited
The lifting mechanism 23 adopts a connecting rod connection, a screw rod 22 is additionally arranged at the middle position, and the lifting mechanism is connected with a motor 13 through a coupler 12, so that the screw rod 22 rotates to pull a bilateral support, thereby playing the functions of ascending and descending, an upper platform of the lifting mechanism 23 is connected with an upper flat plate 24 of the lifting mechanism through a bolt, a lower platform is connected with a bottom plate 20 of the lifting mechanism through a bolt, and the lifting mechanism has the advantages of small volume, multiple functions, light weight, no noise, compact structure, convenience in installation, flexibility in use, wide power source, high transmission efficiency, long service life and the like.
The measurement and control device 21 mainly comprises a temperature measurement and control module, the temperature measurement and control module mainly comprises a temperature measurement module and a temperature control value module, and mainly comprises a K-type thermocouple sensor, an NI9213 thermocouple input module, a Lab VIEW control program, an NI9263 analog voltage output module, a current amplification circuit, a solid-state relay, a fixed-weft GPD-4303S programmable direct-current power supply, a heating plate and the like. The communication module mainly comprises a computer, an NI9312 thermocouple input module, an NI9263 analog voltage input module, a fixed weft GPD-4303S programmable direct current power supply and the like, and all the modules are communicated with the computer through different interface forms. NI9213 and NI9263 realize the transmission of multichannel temperature signal and control signal through ethernet or wireless network, and programmable DC power supply realizes the input and the output of voltage, electric current signal through USB interface and computer connection.
The constant temperature water tank 56 is composed of a water inlet valve 48, a water discharge valve 52, a display panel 54, a temperature sensor 53, a compressor 50, a stirrer 49, a heating pipe 51 and an insulating layer filling 55. The water inlet valve 48 and the water outlet valve 52 are respectively arranged at two sides of the constant temperature water tank 56. The compressor 50 is used for cooling when the temperature of the water in the constant temperature water tank 56 is too high. The agitator 49 is used to mix the water in the tank uniformly. The heating device adopts the heating pipe 51 to realize the heating process of the water temperature of the water tank, and has the characteristics of small volume and high power. The temperature control system adopts an AT89C51 singlechip as a control system, uses closed-loop control, detects the temperature by a contact sensor DS18B20, and has the advantages of low cost, small volume, light weight and accurate and stable control. The system block diagram is shown in figure 6, the temperature control system comprises a water temperature measuring part, a button temperature setting part, an alternating current heating part, a display part and the like, the water temperature can be measured in real time, if the temperature is lower than a desired temperature value, a circuit where the electric furnace is located is closed, a resistance wire starts to heat, otherwise, the circuit where the electric furnace is located is disconnected to reduce the water temperature, and the temperature reaches a value which tends to be set. And when the temperature is not at an appropriate value, alarming and reducing the temperature by using the compressor. The display part adopts a 7SEG-MPX2-CA nixie tube, the display operation is simple and convenient, the software of the driving part is simple, the price is low, the display is stable and clear, the safety and the reliability are high, the shell is made of flame-retardant PC plastic, the strength is high, the ageing resistance, the ultraviolet resistance, the dust resistance and the water resistance are realized. The alarm control module adopts a Sounder digital buzzer as an alarm device, so that the circuit is simple, the price is low, a power supply is not required to be configured, more energy is saved, the buzzer can sound only by outputting pulse through a single chip, and the difference of sound can be simply controlled by controlling the length of the pulse. The constant-temperature water tank realizes automatic control of water temperature and output of constant-temperature water.
The universal wheel 18 is a polyurethane caster wheel, and is mainly composed of a rotating shaft, a thickened flat plate, a protective shell, a brake pedal, a mute wheel shaft, a built-in bearing and the like, bolt holes in the thickened flat plate of the universal wheel are connected with a lower base plate through bolts, double bearings are adopted, the universal wheel has the functions of being wear-resistant, static, strong in bearing capacity and the like, four are arranged in symmetrical distribution, the convenience of moving the testing device is greatly improved, and when the universal wheel is fixed, the brake pedal is pressed down.
The heat-insulating layer is made of silicic acid ceramic fibers, has the effects of lasting heat preservation, heat insulation and fire resistance, and can better reduce heat loss in the test process. The hot plate and the back plate are provided with protective insulating layers, and a circle of heat-insulating layer is also surrounded on the whole heating periphery, so that the heat loss is reduced, and the measurement precision is improved.
The working principle is as follows: the test is carried out, firstly, the test piece is installed, the clamping device at the upper end is pulled down, then the lifting device can be lowered by pressing the switch, the test piece is installed, then, external facilities are connected, and the test can be carried out by starting software.
The temperature acquisition module acquires the temperature of the heating plate through a thermocouple, and the temperature signal is analyzed and processed through a Lab VIEW control program to output a temperature control signal which is finally transmitted to the solid-state relay and the programmable direct-current power supply respectively to realize the heating power control of the protection plate and the heating plate.
The working principle of the constant-temperature water tank is that a target temperature value is set through a temperature controller, a stirrer is started, the temperature of liquid in the constant-temperature water tank is collected through a temperature sensor and compared with the target temperature value, and a heater or a compressor is started to heat or cool the liquid. Through DS18B20 temperature measurement, give AT89C51 singlechip with temperature information transfer and carry out data processing, the singlechip will detect temperature and set temperature information transfer and show for the charactron, the singlechip still can compare the value of actual temperature and demand temperature simultaneously, if it is less than the required value to detect the temperature, the electric stove begins working, and the relay is closed after the temperature increases to expectation. If the water temperature is in an abnormal value, the singlechip controls the buzzer to sound and alarm and cool.
The principle of the instrument is that a single-protection flat plate method is used for testing the heat conductivity coefficient of a material, a stable heat transfer environment is provided for a test piece in the testing process, and when the whole testing system reaches a stable state, one-dimensional stable heat flow distribution similar to that existing in an infinite flat plate is formed in the central area of the tested piece with a limited size, so that the heat conductivity coefficient of the material is calculated by using the relevant knowledge of heat transfer science.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a over-and-under type coefficient of heat conductivity test instrument of constant temperature basin which characterized in that: the cold plate is connected with the upper transverse plate 2, the pressing plate 3, the pressure sensor 30 and the fixing screw 4 through the screw rod 1, pressure is applied to the cold plate 5 through the rotating screw rod 1, and the cold plate is read through the pressure sensor 30.
2. The elevating type thermal conductivity testing instrument of the constant temperature water tank as claimed in claim 1, wherein the center of the cold plate 5 is a core part of the cold plate, the cold plates at the periphery are made of a rectangular shape, a soaking plate made of copper and an aluminum alloy plate with a rectangular groove therein are made of copper, a rectangular spiral groove is arranged in the middle of the cold plate 5, threaded holes are arranged at both sides close to the supporting columns for connecting with the clamping device, one end of the clamping mechanism 29 is fixed on the two supporting columns 31 in a form of a snap ring, and when a test piece needs to be replaced, the clamping mechanism 29 is pressed down, so that the fixing effect is achieved. And in addition, threaded joints are arranged on two sides, and a flowmeter probe 40 and a temperature sensor probe 36 are respectively arranged at two ends of each joint and are used for detecting the flow and the temperature of water flowing into the central cold plate, so that the heat taken away by the water is calculated and is the heat for heating, and the accuracy of the heat conductivity coefficient test value is further improved. The flow meter used was a doppler ultrasonic flow meter.
3. The elevating thermal conductivity testing instrument of a constant temperature water bath according to claim 1, wherein: the silicone sheet 27 is a high thermal conductivity material and is attached to the heat protection plate 9 and the cold plate 5 by its own slight self-adhesion.
4. The elevating thermal conductivity testing instrument of a constant temperature bath as set forth in claim 1, wherein said hot plate 46 is a square plate of 100 x 100mm, and has a resistance wire of a zigzag shape inside it, and 8 guard plates 45 having labyrinth resistance wires inside all around. The guard plate 45 and the hot plate 46 are in interval, heat insulation is carried out by adopting a heat insulation layer 47, and the hot plate 46 and the guard plate 45 are connected into a whole through a non-metallic material with high temperature resistance.
5. The elevating type thermal conductivity measuring instrument for a constant temperature water bath according to claim 1, wherein the thermal insulation layers 10 and 25 are respectively formed on the upper and lower surfaces of the back plate 11, and the thermal insulation layer 26 surrounds the heated main body portion, thereby having the effects of lasting thermal insulation and fire resistance and preventing heat loss.
6. The elevating thermal conductivity testing instrument for a constant temperature water bath as claimed in claim 1, wherein the back plate 11 is connected to the upper plate 24 of the elevating mechanism through the thermal insulation layer 25, and the inside thereof is a resistance wire shaped like a Chinese character 'hui', and the set temperature is the same as the set temperature of the hot plate 46, so that the direction of the heat flow generated by the hot plate is only one-dimensionally conducted in one direction, and there is no thermal conduction between the two.
7. The elevating thermal conductivity testing instrument of a constant temperature water bath according to claim 1, wherein: the supporting column 31 is provided with a clamping mechanism 29 and is also connected with the lifting platform bottom plate 20 and the base 17.
8. The elevating thermal conductivity testing instrument of a constant temperature water bath according to claim 1, wherein: the lifting mechanism 23 is controlled by a motor, the up-down lifting platform is integrally connected with an instrument through bolts, the lifting platform bottom plate 17 is connected with an instrument shell 34 made of a transparent high-temperature-resistant acrylic plate through a positioning hole, and the observation plates 8 are arranged in the front and at the back of the shell and connected with the shell 34 through hinges.
9. The elevating thermal conductivity testing instrument of a constant temperature water bath according to claim 1, wherein: the constant-temperature water tank 56 is composed of a water inlet valve 48, a water discharge valve 52, a display panel 54, a temperature sensor 53, a compressor 50, a stirrer 49, a heating pipe 51 and a heat preservation layer filling 55, is subjected to data control by an AT89C51 single chip microcomputer, is high in temperature accuracy, ensures that the water temperature of the water discharge valve is constant, is connected with the base 17 through bolts, and is symmetrically provided with 4 universal wheels 18 below the base 17.
10. The elevating thermal conductivity testing instrument of a constant temperature water tank as claimed in claim 1, wherein the measurement and control device 21 is composed of a data measuring device and a control device, and is fixed on the bottom plate 20 of the elevating platform by bolts, the temperature of the measurement and control device is measured by using K-type thermocouple wires, the data is collected by NI9213, NI3263 data collecting module and NI9189 of the cabinet, the software compiled by lavbiew is used for controlling and storing the data, and a PID control algorithm is added in the aspect of temperature control, so that the accuracy of the data is further improved, and the automation degree of the test can be efficiently improved.
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