Multichannel thermal field test deviceTechnical field
The utility model is related to a kind of thermal field test device, particularly a kind of multichannel thermal field test device.
Background technology
When carrying out thermal field test to temperature standard case, data acquisition is carried out usually using branched thermal resistance, thermal resistanceSensor section is positioned over the different location inside thermostatical instrument, and the terminals of thermal resistance are connect with terminal box.
Conventional method would generally use the line length thermal resistance even longer for 3-4 meters, and hot wire winding occurs often, thisThe service life of thermal resistance is not only lost, thermal resistance can be caused to damage when serious.After wiring before data acquisition simultaneously is acquired with dataTake out stitches and take time and effort, frequent wiring and take out stitches but also often occurring the situation of loose contact or wrong channel when testingOccur, largely slow down the efficiency of test.
From the foregoing, it will be observed that hot wire winding and damage easily occur at work for existing thermal field data acquisition device, andWiring takes time and effort with the process taken out stitches.
Utility model content
The purpose of this utility model is to provide a kind of multichannel thermal field test devices.
Realize the utility model aim technical solution be：A kind of multichannel thermal field test device, is adopted including thermal field dataAcquisition means and thermal field data processing equipment；
The thermal field data acquisition device includes a rectangular aluminum square box, and rectangular aluminum square box is equipped with multiple respectively sidesLattice, it is a temperature data acquisition channel each to divide equally grid, each temperature data acquisition channel built-in thermoelectric resistance conducting wire, springReed and brake apparatus, respectively grid top be provided with thermal resistance sensor, one end of thermal resistance conducting wire and thermal resistance sensorConnection, the other end are connect with spring reed, and brake apparatus is used to fixing and recycling thermal resistance conducting wire；
The thermal field data processing equipment is used to convert electrical signals to digital signal.
Compared with prior art, the remarkable advantage of the utility model is：The utility model is carrying out temperature to temperature standard caseDuring the test of field, avoid and hot wire winding occur, reduce the loss of thermal resistance, improve the service life of thermal resistance.Exempt from simultaneouslyTaking out stitches after the wiring and data acquisition gone before data acquisition, not only increases the efficiency of thermal field test, decreases contactBad or wrong channel case generation.
Description of the drawings
Fig. 1 is the multichannel thermal field test device application schematic diagram of the utility model.
Fig. 2 is the thermal field data acquisition device structure chart of the utility model.
Fig. 3 is the single channel interior structure diagram of the thermal field data acquisition device of the utility model.
Specific embodiment
With reference to Fig. 1, a kind of multichannel thermal field test device is filled including thermal field data acquisition device 1 and thermal field data processingPut 2；
With reference to Fig. 2, Fig. 3, the thermal field data acquisition device 1 includes a rectangular aluminum square box, and rectangular aluminum square box is setThere are multiple respectively grids, each divide equally grid for a temperature data acquisition channel 4, built in each temperature data acquisition channel 4Thermal resistance conducting wire 7, spring reed 9, brake apparatus 10, thermal resistance sensor 6, which is located at, divides equally grid top, thermal resistance conducting wire 7One end is connect with thermal resistance sensor 6, and the other end is connect with spring reed 9, and brake apparatus 10 is used to fixing and recycling thermal resistanceConducting wire；
The thermal field data processing equipment 2 is used to convert electrical signals to digital signal；
The thermal resistance sensor 6 is Pt100 platinum resistance thermometer sensor,s.
The thermal field data processing equipment is 2700 digital multimeters.
The thermal resistance conducting wire is connect by buckle 8 with spring reed.The thermal resistance conducting wire and the one end snapped connectionIt is connect by connecting line with thermal field data processing equipment.
The test method of above-mentioned multichannel thermal field test device is：
1) according to the temperature range where temperature standard case to be measured work, the thermal field data in corresponding thermometric section is selected to acquireDevice；
2) according to the constant temperature zone size of temperature standard case to be measured, temperature data acquisition port number used in selection testThe length of amount and required thermal resistance conducting wire, and thermal resistance sensor is positioned over test point, thermal resistance is fixed by brake apparatusConducting wire；
3) temperature standard case is powered, and the required temperature spot tested is set；
4) when temperature standard case shows the temperature for having reached required test, kept for the time of setting；
5) it powers to thermal field data acquisition device, thermal field data processing equipment, thermal field data acquisition device carries out data and adoptsCollection；
6) data of acquisition are carried out with temperature deviation calculating, temperature uniformity calculating and temperature fluctuation to calculate, is obtainedThe thermal field distribution situation of tested region.
The utility model is further described with reference to embodiment and attached drawing.
Embodiment
As shown in Figure 1, the multichannel thermal field of the present embodiment tests system by thermal field data acquisition device 1 and thermal field dataReason device 2 forms.Thermal field data acquisition device 1 is responsible for collecting temperature data, and each temperature spot acquires 15 times, and one is acquired per 2minIt is secondary.Thermal field data processing equipment 2, which is responsible for converting electrical signals to digital signal, to be shown, is recorded and is handled by host computer 3The data that each channel acquisition comes.Calculated by temperature deviation, temperature uniformity calculate and temperature fluctuation calculate, using pointAnalysis compares, it can be deduced that the thermal field distribution situation of tested region.
Temperature deviation calculates
Δtd=td-to
In formula, Δ td--- temperature deviation, DEG C；
to--- the average value that test zone central point n times measure, DEG C；
td--- all channel n times measure temperature averages, DEG C.
Temperature uniformity calculates
In formula, Δ tu--- temperature uniformity, DEG C；
N --- pendulous frequency；
timax--- the maximum temperature that each test point is measured in ith, DEG C；
timin--- the minimum temperature that each test point is measured in ith, DEG C.
Temperature fluctuation calculates
Δtf=± (tomax-tomin)/2
In formula：Δtf--- temperature fluctuation, DEG C；
tomax--- the maximum temperature in the measurement of test zone central point n times, DEG C；
tomin--- the minimum temperature in the measurement of test zone central point n times, DEG C.
As shown in Fig. 2, the thermal field data acquisition device 1 of the utility model is by 20 identical temperature data acquisition channels 4And the connecting line 5 for being connect with thermal field data processing equipment forms.
As shown in figure 3, it is can be seen that by Pt100 platinum thermoelectricity from the single channel sectional drawing of thermal field data acquisition device 1Sensor 6 and thermal resistance conducting wire 7 are hindered, buckle 8, spring reed 9 and thermal resistance conducting wire brake apparatus 10 form.Buckle 8 will be ledLine 7 is fixed on spring reed 9, and one end of conducting wire 7 is connected with Pt100 platinum thermal resistance sensors 6, the other end buckle 8 atThe connecting line 5 of thermal field data processing equipment is connected.Thermal resistance sensor 6 is pulled outwardly the length needed for stretching out during use, and is led toThermal resistance conducting wire brake apparatus 10 fixes thermal resistance conducting wire.10 thermoelectric of thermal resistance conducting wire brake apparatus resistance sensor, 6 direction pushes awayIt is dynamic to fix conducting wire, reversely push conducting wire that can recycle automatically.