CN211318600U - Device for researching influence of solid electrode oxide film on liquid-solid contact resistance - Google Patents
Device for researching influence of solid electrode oxide film on liquid-solid contact resistance Download PDFInfo
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- CN211318600U CN211318600U CN201921340975.3U CN201921340975U CN211318600U CN 211318600 U CN211318600 U CN 211318600U CN 201921340975 U CN201921340975 U CN 201921340975U CN 211318600 U CN211318600 U CN 211318600U
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Abstract
The utility model discloses a device for researching the influence of a solid electrode oxide film on liquid-solid contact resistance, which comprises a vacuum glove box, a microohm meter and a resistance measuring device, wherein the microohm meter and the resistance measuring device are respectively arranged outside and inside the vacuum glove box; the resistance measuring device comprises an insulating glass groove, a liquid metal conductor is arranged in the insulating glass groove, two same metal conductor electrodes with variable distances are further arranged in the insulating glass groove, an electrode clamp fixing position is arranged on each metal conductor electrode, and the microohmmeter is connected with the electrode clamp fixing position through a Kelvin test clamp. The utility model creates an anaerobic condition, and reduces the measurement error caused by the additional oxide film layer generated by the oxidation of the liquid or solid metal conductor in the measurement process; the measurement error caused by the initial oxidation film and the component unevenness of the liquid metal is reduced.
Description
Technical Field
The utility model relates to a liquid metal electrical contact field especially relates to a research device of solid electrode oxidation film to liquid solid contact resistance influence.
Background
The liquid metal switch is a type of switch in which liquid metal is driven by inertia force or other acting force to be in contact with and conducted with a conductor electrode. There is a contact resistance between the liquid metal and the conductor electrode. When a large current passes through the contact resistor, a large amount of heat is generated, so that the temperature of the switch is increased, the on-resistance is continuously increased, the vicious circle damages the circuit, and the service life of the switch is influenced. The size of the contact resistance can be controlled to effectively ensure that the switch equipment can stably operate under rated power and ensure the service life of other equipment connected with the switch equipment.
The contact resistance is composed of a film resistance and a shrinkage resistance. Film resistance refers to resistance produced by a film with poor conductivity composed of oxides, sulfides and other pollutant impurities formed on the contact surface; pinch resistance refers to the increase in resistance of a metal caused by the pinch effect of current passing through a conductive spot. The liquid-solid conductor contact has better compatibility and wettability than the solid-solid conductor contact, so that the shrinkage resistance ratio is smaller, and the reduction of the film resistance is the main method for reducing the liquid-solid contact resistance.
Chinese patent CN103163375A proposes a method for measuring contact resistance of solid-liquid conductor, and chinese patent CN105301358A proposes an on-line detection device for film resistance on vacuum winding coating equipment, but is not suitable for investigating the influence of solid oxide film on contact resistance of solid-liquid conductor.
In the process of measuring the influence of the solid oxide film on the liquid-solid contact resistance, liquid metal (such as gallium indium tin) is easy to form a surface oxide film in an air environment, and the contact resistance generated when the liquid metal before and after oxidation is in mutual contact with the same solid electrode is greatly different, so that an oxygen-free environment is provided for measurement and the measurement accuracy can be ensured.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough among the prior art, provide a study solid electrode oxidation film to the device of liquid solid contact resistance influence, the utility model discloses the device can provide an anaerobic measuring environment, overcomes the easy oxidation of liquid metal and influences measuring accuracy. The contact resistance value was calculated by the mean difference method.
The utility model aims at realizing through the following technical scheme:
the device for researching the influence of the solid electrode oxide film on the liquid-solid contact resistance comprises a vacuum glove box, a microohm meter and a resistance measuring device, wherein the microohm meter and the resistance measuring device are respectively arranged outside and inside the vacuum glove box; the resistance measuring device comprises an insulating glass groove, a liquid metal conductor is arranged in the insulating glass groove, two same metal conductor electrodes with variable distances are further arranged in the insulating glass groove, an electrode clamp fixing position is arranged on each metal conductor electrode, the micro-ohmmeter is connected with the electrode clamp fixing position through a Kelvin test clamp, and the liquid metal conductor between the two metal conductor electrodes forms a liquid metal column.
Further, an oxygen detector is arranged in the vacuum glove box.
Further, the air inlet hole is connected with a nitrogen bottle.
Furthermore, marks are respectively made at the positions of the fixing position of the electrode clamp and the liquid level, and the distance between the fixing position of the electrode clamp and the liquid level and the distance between the two metal conductor electrodes are measured through a ruler. Compared with the prior art, the utility model discloses a beneficial effect that technical scheme brought is:
1. the connection of the nitrogen cylinder and the vacuum glove box creates an anaerobic condition in the vacuum glove box, and the oxygen detector accurately measures the existence of oxygen, thereby reducing the measurement error caused by an additional oxide film layer generated by the oxidation of a liquid or solid metal conductor in the measurement process.
2. The average difference value method is adopted to calculate the contact resistance value, so that the measurement error caused by uneven components and initial oxide films of the liquid metal is reduced, the accidental error is effectively reduced, and the measurement accuracy is improved.
3. The resistance of the loop is measured by a Kelvin four-wire detection method, so that the influence of a gauge pen and wiring on the measurement of the contact resistance is eliminated.
Drawings
Fig. 1 is a schematic structural diagram of the device of the present invention.
FIG. 2 is a schematic front view of the resistance measuring apparatus, which is disposed in a glove box for operation.
Fig. 3 is a schematic top view of the resistance measuring device.
Fig. 4 is an equivalent circuit diagram of the resistance measuring device.
Fig. 5 is a diagram of the end of the metal conductor electrode in contact with the liquid metal conductor.
Reference numerals: 1-glove hole, 2-air outlet hole, 3-air inlet hole, 4-microohm meter, 5-resistance measuring device, 6-metal conductor electrode, 7-metal conductor electrode, 8-insulating glass groove, 9-electrode clamp fixing position, 10-electrode clamp fixing position, 11-liquid metal conductor, and 12-15 metal conductor electrodes with different oxidation degrees.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the device for researching the influence of the solid electrode oxide film on the liquid-solid contact resistance shown in fig. 1, a resistance measuring device 5 is placed in a vacuum glove box, and a nitrogen bottle is connected with the glove box and is filled with nitrogen gas for circulating filtration of oxygen gas, so that an oxygen-free environment is formed. The microohmmeter 4 is started, measurement is carried out by using a 0-100 m omega measuring range, the precision reaches 0.015%, the measurement precision is high, the microohmmeter adopts a four-end Kelvin test clamp, the oxygen detector is placed in the glove box and started, the nitrogen cylinder is connected with the air inlet 3 (the air outlet 2 is opened simultaneously) on the glove box, the air outlet of the nitrogen cylinder is adjusted, oxygen in the box is discharged, the glove is arranged on the glove hole 1 when the oxygen content in the box is zero, and the nitrogen outlet rate is adjusted again. The left and right electrodes of the measuring device are arranged, the four-terminal clamp of the micro-ohmmeter is fixed on the two electrodes, a certain amount of liquid metal conductor 11 is poured into the insulating glass groove 8, and the measurement of the contact resistance is started. The nitrogen is introduced in the whole experiment process, and the glove box is ensured to be in an anaerobic environment. In this embodiment, the liquid metal conductor 11 is made of gallium indium tin alloy, and is placed in a sealed opaque bottle, and is placed in a vacuum glove box before the start of the experiment, and after the oxygen is exhausted, the liquid metal conductor can be poured into an insulating glass tank through the glove hole 1, so that the oxidation of the oxygen is eliminated.
A pair of metal conductor electrodes 6, 7 with equal length, width and height as shown in figure 2 are arranged at two ends of a cuboid insulating glass groove 8, a microohmmeter four-terminal test clamp is respectively and fixedly clamped at the positions of electrode clamp fixing positions 9, 10 on the conductor, and the distance between the two metal conductor electrodes 6, 7 is Lx(x is a distance number), a liquid metal conductor 11 is filled in the insulating glass tank 8, and a liquid metal conductor 11H is measured2And the length H from the liquid level to the position of the electrode clamp1Length H1The conductor resistance value of (1) is Ra、RbIs measured directly by a microohm meter, H2The conductors of the length are all at equal potential. The liquid metal conductor 11 between the two metal conductor electrodes 6, 7 is defined as a liquid metal column, LxI.e. the length of the liquid metal column.
L in FIG. 3xHas an initial measurement position of L11cm, corresponding to a microohm meter showing a total resistance of Rab1The metal conductor electrode 6 is fixed, the metal conductor electrode 7 moves from the initial position to the right, moves 1cm to the right each time, and the distance between the two electrodes is L in sequence2、L3、L4… corresponding to a total resistance of Rab2、Rab3、Rab4…, the resistance value is recorded every 1cm of the right movement, and the measurement of multiple sets of data is repeated and averaged.
FIG. 4 is an equivalent circuit diagram of a resistance measuring device, the total measuring resistance RabxFrom a length of H1On the two metal conductor electrodes 6, 7Value Ra、RbAnd a distance L from the two conductor electrodesxResistance value R of time liquid metal columnxAnd contact resistance rax、rbxAre connected in series. Namely:
the unit is mu omega, and x is the distance number of the two electrodes.
Using a difference formula to process and solve Rx。
Rx＝xR (3)
R is the average resistance value of the liquid metal of a cuboid column with the length of 1 cm.
And (6) obtaining the contact resistance.
rai+rbi＝Rabi-Ra-Rb-Ri(4)
i＝1，2，3，...，n
rabTo obtain the contact resistance value.
In the above equation, i denotes the number of the distance between the electrodes, and equation (4) denotes the contact resistance calculation method at an arbitrary distance, as in the case of the above x. Namely rai+rbiRefers to the contact resistance of the two electrodes at a certain distance.
raRefers to the contact resistance, r, of the first electrode with the liquid conductorbRefers to the contact resistance of the second electrode and the liquid conductor. r isaAnd raxThe difference of (1): r isaMeans the finally calculated average contact resistance, raxIs the contact resistance of the two electrodes at a distance x length.
The utility model discloses a measuring method can measure many times under the anaerobic condition and get contact resistance's average value, obtains accurate contact resistance value. The whole measuring process accurately ensures the anaerobic condition, and eliminates the influence of oxygen on the oxidation of liquid metal in the measuring process on the accuracy of measured data.
The present invention is not limited to the above-described embodiments. The above description of the embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above embodiments are merely illustrative and not restrictive. Without departing from the spirit of the invention and the scope of the appended claims, the person skilled in the art can make many changes in form and detail within the teaching of the invention.
Claims (4)
1. The device for researching the influence of the solid electrode oxide film on the liquid-solid contact resistance is characterized by comprising a vacuum glove box, a microohm meter and a resistance measuring device, wherein the microohm meter and the resistance measuring device are respectively arranged outside and inside the vacuum glove box; the resistance measuring device comprises an insulating glass groove, a liquid metal conductor is arranged in the insulating glass groove, two same metal conductor electrodes with variable distances are further arranged in the insulating glass groove, an electrode clamp fixing position is arranged on each metal conductor electrode, and the microohmmeter is connected with the electrode clamp fixing position through a Kelvin test clamp; the liquid metal conductor between the two metal conductor electrodes is configured as a liquid metal column.
2. The device for researching the influence of the solid electrode oxide film on the liquid-solid contact resistance as claimed in claim 1, wherein an oxygen detector is further arranged in the vacuum glove box.
3. The device for researching the influence of the solid electrode oxide film on the liquid-solid contact resistance according to claim 1, wherein the gas inlet hole is connected with a nitrogen gas bottle.
4. The apparatus for investigating the effect of a solid electrode oxide film on liquid-solid contact resistance as claimed in claim 1, wherein the positions of the electrode clip fixing part and the liquid level are marked respectively, and the distance from the electrode clip fixing part to the liquid level and the distance between the two metal conductor electrodes are measured by a scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921340975.3U CN211318600U (en) | 2019-08-19 | 2019-08-19 | Device for researching influence of solid electrode oxide film on liquid-solid contact resistance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921340975.3U CN211318600U (en) | 2019-08-19 | 2019-08-19 | Device for researching influence of solid electrode oxide film on liquid-solid contact resistance |
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| CN211318600U true CN211318600U (en) | 2020-08-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470908A (en) * | 2019-08-19 | 2019-11-19 | 天津大学 | Solid electrode oxidation film is studied to the device and method of liquid-solid contact Resistance Influence |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470908A (en) * | 2019-08-19 | 2019-11-19 | 天津大学 | Solid electrode oxidation film is studied to the device and method of liquid-solid contact Resistance Influence |
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