CN217034096U - Measuring device for electrical conductivity of cylindrical thermoelectric material - Google Patents
Measuring device for electrical conductivity of cylindrical thermoelectric material Download PDFInfo
- Publication number
- CN217034096U CN217034096U CN202123282204.3U CN202123282204U CN217034096U CN 217034096 U CN217034096 U CN 217034096U CN 202123282204 U CN202123282204 U CN 202123282204U CN 217034096 U CN217034096 U CN 217034096U
- Authority
- CN
- China
- Prior art keywords
- molybdenum
- crystal bar
- molybdenum wire
- voltage detection
- probe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The present invention relates to the field of electrical property measurement. The measuring device for the conductivity of the cylindrical thermoelectric material comprises a current output device, wherein the current output device comprises a digital source meter, a fixed probe and a movable probe, and the current output end of the digital source meter is respectively connected with the fixed probe and the movable probe; the fixed probe and the movable probe are respectively used for contacting the left end surface and the right end surface of the crystal bar; the device also comprises voltage detection ends which are arranged along the axial direction of the crystal bar, wherein the voltage detection ends comprise molybdenum wires which are used for wrapping the outer circumference of the crystal bar and a movement mechanism which drives the molybdenum wires to move; the movement mechanism comprises a support frame and a longitudinal moving frame which is longitudinally connected with the support frame in a sliding manner, a clamping cylinder is arranged on the longitudinal moving frame, a wiring terminal connected with a voltmeter is arranged on the clamping cylinder, and the positive pole and the negative pole of the voltmeter are respectively connected with the wiring terminals of the adjacent voltage detection ends; one end of the molybdenum wire is connected with the wiring terminal, and the other end of the molybdenum wire is connected with the balance weight. The patent gives a device basis for detecting the conductivity of the crystal bar.
Description
Technical Field
The utility model relates to the field of electrical property measurement, in particular to a device for measuring the electrical conductivity of a cylindrical thermoelectric material.
Background
Conductivity is a fundamental physical quantity characterizing the electrical properties of a material, reflecting the conductive ability of the material. Thermoelectric materials are key materials of thermoelectric refrigeration or power generation devices, and the index for characterizing the thermoelectric performance of the materials is a figure of merit Z, wherein
(alpha: the seebeck coefficient of the material, sigma: the electrical conductivity of the material, and kappa: the thermal conductivity of the material); where conductivity is a very important indicator, the value of material conductivity is directly related to the design and fabrication of the device.
The "semiconductor refrigeration device and its application" of the institute of Chongguang, et al describes the two-probe method in the method for measuring the electrical conductivity in section 4.2.2 of page 179, in order to ensure good contact, the requirements on the flatness and smoothness of the two end faces of the sample are high, and only one value can be obtained at a time, especially in the face of large-scale production process, it is difficult to obtain the electrical conductivity data of the thermoelectric material and the data distributed along the axial direction rapidly.
SUMMERY OF THE UTILITY MODEL
In view of the problems in the prior art, the present invention provides a device for measuring the electrical conductivity of a cylindrical thermoelectric material, which solves at least one of the above technical problems.
The technical scheme of the utility model is as follows: the device for measuring the electrical conductivity of the cylindrical thermoelectric material is characterized by comprising a crystal bar supporting platform, a measuring device and a control device, wherein the crystal bar supporting platform is used for supporting a crystal bar in an insulating way;
the current output device comprises a digital source meter, a fixed probe and a movable probe, and the current output end of the digital source meter is respectively connected with the fixed probe and the movable probe;
the fixed probe is arranged on the fixed seat, the movable probe is arranged on a sliding platform, and the fixed probe and the movable probe are respectively used for contacting the left end surface and the right end surface of the crystal bar;
the device also comprises voltage detection ends which are arranged along the axial direction of the crystal bar, wherein the voltage detection ends comprise molybdenum wires which are used for wrapping the outer circumference of the crystal bar and a movement mechanism which drives the molybdenum wires to move;
the moving mechanism comprises a support frame and a longitudinal moving frame which is longitudinally connected with the support frame in a sliding manner, clamping cylinders which are arranged in the front and back are installed on the longitudinal moving frame, the clamping cylinders which are arranged in the front and back are respectively connected with two clamping jaws, and molybdenum wire guide wheels are installed on the two clamping jaws and the longitudinal moving frame;
a wiring terminal connected with a voltmeter is arranged on the clamping cylinder;
one end of the molybdenum wire is connected with the wiring terminal, the other end of the molybdenum wire is connected with a balancing weight, the wiring terminal and the balancing weight are respectively positioned on the front side and the rear side of the clamping cylinder, and the molybdenum wire sequentially winds molybdenum wire guide wheels arranged on the two clamping jaws and molybdenum wire guide wheels arranged on the supporting frame from the wiring terminal side.
This patent has realized that the molybdenum filament wraps around the periphery of crystal bar through optimizing the structure, has given the crystal bar to detect the equipment basis of conductivity. Through the balancing weight, the molybdenum wires are always in a tensioning state, and meanwhile, the tension of all the molybdenum wires is kept consistent.
The positive pole and the negative pole of the voltmeter are respectively connected with the wiring terminals of the adjacent voltage detection ends. Outputting 2Hz-50Hz rectangular wave pulse current by a digital source meter, collecting corresponding voltage values by a voltmeter and the current output by the digital source meter at the same frequency and the same phase, calculating the average value of the absolute value of the voltage not less than one period, dividing the obtained average value by the current value set by the digital source meter to obtain the resistance value of the crystal bar in the measuring interval, and obtaining the resistance value of the crystal bar in the measuring interval according to the current value set by the digital source meter
(R is the resistance value of the crystal bar between two adjacent molybdenum wires, L is the distance between two adjacent molybdenum wires, and S is the sectional area of the crystal bar between two molybdenum wires) to calculate the conductivity of the crystal bar in the area between two molybdenum wires.
Further preferably, the adjacent voltage detection terminals are equally spaced.
The axial equidistant detection or the step-by-step condition of the conductivity of different areas of the crystal rod is convenient.
Further preferably, the diameter of the molybdenum wire is 0.1mm to 0.25 mm.
Further preferably, a telescopic cylinder is installed on the supporting frame, and a piston rod of the telescopic cylinder is in transmission connection with the longitudinal moving frame.
The vertical movement of the longitudinal moving frame is convenient to realize.
Preferably, the lower ends of the two clamping jaws are inclined parts with the distance decreasing from top to bottom, and the lower end parts of the inclined parts are provided with the molybdenum wire guide wheels.
The fixation of the molybdenum wire is convenient.
Further preferably, all the voltage detection ends share the same movement mechanism;
the two clamping jaws are respectively connected with two connecting rods, and molybdenum wire guide wheels used for guiding molybdenum wires at the voltage detection ends are sequentially arranged in the length direction of the connecting rods.
The molybdenum wires at all the voltage detection ends can move synchronously.
Preferably, the distance between the molybdenum wire guide wheels of the adjacent voltage detection ends is equal, and the molybdenum wire guide wheels are provided with V-shaped grooves embedded with molybdenum wires.
And controlling the error.
Further preferably, the digital source meter is connected with a resistor in series on the connecting line of all the fixed probes;
and the digital source meter is connected with all the movable probes in series through a resistor.
The resistance value of the resistor is 0.5-1 ohm, and the power is not less than 10 milliwatts.
The series resistance on the probe wire can improve the distribution consistency of the current flowing into the surface of the sample by each probe, and improve the distribution uniformity of the power line in the sample, thereby improving the measurement accuracy and effectively improving the abnormal jump of the measured value.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a partial cross-sectional view taken at A-A of FIG. 1 in accordance with the present invention;
fig. 3 is a partial cross-sectional view of the molybdenum wire of the present invention wrapped around the periphery of the ingot.
In fig. 1, 1 is a bottom plate, 2 is a fixed base, 3 is a longitudinal moving frame, 5 is a front cylinder and a rear cylinder, 6 is a pre-pressing plate, 7 is a sliding platform, 11 is a crystal bar supporting platform, 12 is a crystal bar, 13 is a clamping cylinder, 14 is a telescopic cylinder, 15 is a clamping jaw, 16 is a molybdenum wire, 17 is a molybdenum wire guide wheel, and 18 is a counterweight.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 3, in embodiment 1, an apparatus for measuring electrical conductivity of a cylindrical thermoelectric material includes a support platform 11 for supporting a crystal ingot 12 in an insulating manner; the crystal bar supporting platform is arranged on a moving platform of a front cylinder 5 and a rear cylinder 5 which can move back and forth.
The current output device comprises a digital source meter, a fixed probe and a movable probe, and the current output end of the digital source meter is respectively connected with the fixed probe and the movable probe. That is, the two output electrodes of the digital source meter are respectively connected with the fixed probe and the movable probe. The fixed probe is arranged on the fixed seat 2, and the movable probe is arranged on a sliding platform 7. The fixing seat 2 is fixed on the bottom plate 1. The sliding platform 7 is connected with the bottom plate 1 in a sliding way through a telescopic cylinder. The fixed probe and the movable probe are used to contact the left end surface and the right end surface of the ingot 12, respectively. Distribution density of 2 roots/cm for fixed probe and movable probe2-3 roots/cm2。
The device also comprises voltage detection ends which are axially arranged along the crystal bar 12, wherein the voltage detection ends comprise molybdenum wires which are used for wrapping the outer circumference of the crystal bar 12 and a movement mechanism which drives the molybdenum wires to move;
the moving mechanism comprises a support frame and a longitudinal moving frame 3 connected with the support frame in a longitudinal sliding mode, clamping cylinders 13 which are arranged in the front and at the back are installed on the longitudinal moving frame 3, and the clamping cylinders 13 which are arranged in the front and at the back are connected with two clamping jaws 15 respectively. The relative movement of the two clamping cylinders realizes the closing of the two clamping jaws. Molybdenum wire guide wheels 17 are arranged on the two clamping jaws 15 and the longitudinal moving frame 3; the clamping cylinder 13 is provided with a wiring terminal connected with a voltmeter, and the anode and the cathode of the voltmeter are respectively connected with the wiring terminals of the adjacent voltage detection ends; one end of a molybdenum wire 16 is connected with a connecting terminal, the other end of the molybdenum wire 16 is connected with a balancing weight 18, the connecting terminal and the balancing weight 18 are respectively positioned at the front side and the rear side of the clamping cylinder 13, and the molybdenum wire 16 sequentially winds molybdenum wire guide wheels 17 arranged on the two clamping jaws and molybdenum wire guide wheels arranged on the supporting frame from the connecting terminal side. The molybdenum wire guide wheel is an insulated wire guide wheel made of an insulated material. The molybdenum wire passes under the molybdenum wire guide wheel 17 on the clamping jaws. The molybdenum wire passes through the upper side of the molybdenum wire guide wheel on the support frame.
This patent has realized that the molybdenum filament wraps around the periphery of crystal bar 12 through optimizing structure, has given crystal bar 12 to detect the equipment basis of conductivity. Through the balancing weight, the molybdenum wires are always in a tensioning state, and meanwhile, the tension of all the molybdenum wires is kept consistent. The weight block is an insulator.
Outputting 2Hz-50Hz rectangular pulse current by a digital source meter, collecting corresponding voltage values by a voltmeter and the current output by the digital source meter in the same frequency and phase, calculating the average value of the absolute value of the voltage not less than one period, dividing the obtained average value by the current value set by the digital source meter to obtain the resistance value of the crystal bar 12 in the measuring interval, and obtaining the resistance value of the crystal bar 12 in the measuring interval according to the current value set by the digital source meter
(R is the resistance value of the crystal bar 12 between two adjacent molybdenum wires; L is the distance between two adjacent molybdenum wires; and S is the sectional area of the crystal bar 12 between two molybdenum wires) the conductivity of the crystal bar 12 in the region between two molybdenum wires is calculated.
The fixed seat and the sliding platform are made of insulating materials. The fixed seat and the sliding platform are both connected with a prepressing plate 6 in a sliding mode, the prepressing plate 6 is made of insulating materials, and through holes penetrating through the fixed probes and the movable probes are formed in the prepressing plate.
The adjacent voltage detection ends are equally spaced. Facilitating axially equidistant detection or stepped conditions of conductivity in different regions of the ingot 12. The diameter of the molybdenum wire is 0.1mm-0.25 mm.
A telescopic cylinder is arranged on the supporting frame, and a piston rod of the telescopic cylinder is in transmission connection with the longitudinal moving frame 3. The up-and-down movement of the longitudinal moving frame 3 is facilitated.
The lower ends of the two clamping jaws 15 are inclined parts with the distance decreasing from top to bottom, and the lower end parts of the inclined parts are provided with molybdenum wire guide wheels. The fixation of the molybdenum wire is convenient. All the voltage detection ends share the same movement mechanism; the two clamping jaws are respectively connected with two connecting rods, and molybdenum wire guide wheels used for guiding molybdenum wires at the voltage detection ends are sequentially arranged in the length direction of the connecting rods. The molybdenum wires at all the voltage detection ends can move synchronously. The distance between the molybdenum wire guide wheels at the adjacent voltage detection ends is equal, and the molybdenum wire guide wheels are provided with V-shaped grooves embedded with molybdenum wires. And controlling the error.
The digital source meter is connected with all the fixed probes in series through a resistor; and the digital source meter is connected with all the movable probes in series through a resistor. The resistance value of the resistor is 0.5 ohm-1 ohm, and the power is not less than 10 milliwatts. The series resistors on the probe leads can improve the distribution consistency of the current flowing into the surface of the sample from each probe, and improve the distribution uniformity of the power lines in the sample, so that the measurement accuracy is improved, and the abnormal jump of the measured value is effectively improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (8)
1. The device for measuring the electrical conductivity of the cylindrical thermoelectric material is characterized by comprising a crystal bar supporting platform, a measuring device and a control device, wherein the crystal bar supporting platform is used for supporting a crystal bar in an insulating way;
the current output device comprises a digital source meter, a fixed probe and a movable probe, and the current output end of the digital source meter is respectively connected with the fixed probe and the movable probe;
the fixed probe is arranged on the fixed seat, the movable probe is arranged on a sliding platform, and the fixed probe and the movable probe are respectively used for contacting the left end surface and the right end surface of the crystal bar;
the device also comprises voltage detection ends which are arranged along the axial direction of the crystal bar, wherein the voltage detection ends comprise molybdenum wires which are used for wrapping the outer circumference of the crystal bar and a movement mechanism which drives the molybdenum wires to move;
the moving mechanism comprises a support frame and a longitudinal moving frame which is longitudinally connected with the support frame in a sliding manner, clamping cylinders which are arranged in the front and back are installed on the longitudinal moving frame, the clamping cylinders which are arranged in the front and back are respectively connected with two clamping jaws, and molybdenum wire guide wheels are installed on the two clamping jaws and the longitudinal moving frame;
a wiring terminal connected with a voltmeter is arranged on the clamping cylinder;
one end of the molybdenum wire is connected with the wiring terminal, the other end of the molybdenum wire is connected with a balancing weight, the wiring terminal and the balancing weight are respectively positioned on the front side and the rear side of the clamping cylinder, and the molybdenum wire sequentially winds molybdenum wire guide wheels arranged on the two clamping jaws and molybdenum wire guide wheels arranged on the supporting frame from the wiring terminal side.
2. The apparatus of claim 1, wherein the cylindrical thermoelectric material comprises: the adjacent voltage detection ends are equally spaced.
3. The apparatus of claim 1, wherein the cylindrical thermoelectric material comprises: the diameter of the molybdenum wire is 0.1mm-0.25 mm.
4. The apparatus of claim 1, wherein the cylindrical thermoelectric material comprises: and a telescopic cylinder is arranged on the supporting frame, and a piston rod of the telescopic cylinder is in transmission connection with the longitudinal moving frame.
5. The apparatus for measuring the electrical conductivity of a cylindrical thermoelectric material according to claim 1, wherein: the lower ends of the two clamping jaws are inclined parts with the distance decreasing from top to bottom, and the lower end parts of the inclined parts are provided with the molybdenum wire guide wheels.
6. The apparatus for measuring the electrical conductivity of a cylindrical thermoelectric material according to claim 1, wherein: all the voltage detection ends share the same movement mechanism;
the two clamping jaws are respectively connected with two connecting rods, and molybdenum wire guide wheels used for guiding molybdenum wires at voltage detection ends are sequentially arranged in the length direction of the connecting rods.
7. The apparatus for measuring the electrical conductivity of a cylindrical thermoelectric material according to claim 1, wherein: the distance between the molybdenum wire guide wheels at the adjacent voltage detection ends is equal, and the molybdenum wire guide wheels are provided with V-shaped grooves embedded with molybdenum wires.
8. The apparatus for measuring the electrical conductivity of a cylindrical thermoelectric material according to claim 1, wherein: the digital source meter is connected with all the fixed probes in series through a resistor;
and the digital source meter is connected with all the movable probes in series through a resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123282204.3U CN217034096U (en) | 2021-12-24 | 2021-12-24 | Measuring device for electrical conductivity of cylindrical thermoelectric material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123282204.3U CN217034096U (en) | 2021-12-24 | 2021-12-24 | Measuring device for electrical conductivity of cylindrical thermoelectric material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217034096U true CN217034096U (en) | 2022-07-22 |
Family
ID=82442907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123282204.3U Active CN217034096U (en) | 2021-12-24 | 2021-12-24 | Measuring device for electrical conductivity of cylindrical thermoelectric material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217034096U (en) |
-
2021
- 2021-12-24 CN CN202123282204.3U patent/CN217034096U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103777078B (en) | Cable conductor DC resistance proving installation and method of testing | |
| CN103513111A (en) | System and method for testing electric conductivity of metal wire | |
| CN104897734B (en) | Soil moisture content real-time measurement system and method in earth structure | |
| CN202939222U (en) | Cable conductor direct-current resistance test device | |
| CN208383989U (en) | A kind of cable direct current resistance m easurem ent device | |
| CN217034096U (en) | Measuring device for electrical conductivity of cylindrical thermoelectric material | |
| CN110873823A (en) | Resistivity testing method for semiconductor material | |
| CN115326884A (en) | Testing device and evaluation method for resistivity of semiconductive rubber and plastic material | |
| CN114325109A (en) | Method for measuring conductivity of cylindrical crystal bar | |
| CN104635118B (en) | A kind of test method of evaluation transformer oil surface breakdown voltage | |
| CN104678181B (en) | Rail resistance rate measuring method | |
| CN211453441U (en) | Resistivity test device under tensile state of indoor undisturbed soil sample | |
| CN109884134A (en) | A kind of electric pole type crude oil water content real-time detector | |
| CN207007940U (en) | A kind of soil resistivity test device | |
| KR100775916B1 (en) | Electricity conductivity measurement equipment for four terminal resistance measurement method | |
| CN115616293A (en) | Volume resistivity measuring device for semi-conductive buffer layer | |
| CN101520302B (en) | Method for measuring the diameter of ultra-fine tungsten wires and device thereof | |
| CN203149035U (en) | Measurement device for specific resistance of dust | |
| CN205718961U (en) | A kind of tantalum wire surveys wave apparatus | |
| CN103149446B (en) | Auxiliary device for measuring electrical impedance of paper | |
| CN2374939Y (en) | Eleven lines d. c. potential difference meter | |
| KR100454676B1 (en) | The multi-electrode cells for measurement of the dielectric strength | |
| JP3360682B2 (en) | Apparatus for measuring critical current value of superconducting wire | |
| CN209356439U (en) | A kind of intelligence conductance salt density tester | |
| CN212341322U (en) | Radial resistivity testing device for cable buffer layer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |