CN-121978413-A - Liquid in-situ conductivity test experimental device under ultra-high pressure low-temperature environment

Abstract

The invention discloses a liquid in-situ conductivity test experiment device in an ultrahigh-pressure low-temperature environment, which comprises an experiment table, wherein an impedance analyzer is arranged on one side of the upper end of the experiment table, the upper end of the experiment table is provided with a placing frame, the upper end of the placing frame is detachably connected with a pressure-bearing cavity, the middle positions of the upper end and the lower end of the outer wall of the pressure-bearing cavity are respectively communicated with an electromagnetic valve and a vacuum valve, a vacuum pump is arranged on one side of the upper end of the experiment table, a pressurizing assembly is arranged on the other side of the upper end of the experiment table, an in-situ conductivity detection module is arranged on the outer wall of the pressure-bearing cavity close to the lower end of the pressure-bearing cavity, a temperature control assembly is arranged on one side of the upper end of the experiment table, a heating compensation assembly is arranged on the outer wall of the temperature control assembly, and a control panel is arranged in the control cabinet. The invention can not only realize the in-situ conductivity test of the liquid, but also control the change of the temperature and pressure environment of the test, and realize the in-situ conductivity test under the ultra-high pressure and low temperature environment.

Inventors

• LIU ZHAO
• PAN YILONG

Assignees

• 宁波大学

Dates

Publication Date

20260505

Application Date

20260127

Claims (9)

1. 1. The liquid in-situ conductivity test experiment device comprises an experiment table (1), and an impedance analyzer (11) arranged at one side of the upper end of the experiment table (1), and is characterized in that the upper end of the experiment table (1) is provided with a placement frame (12), the upper end of the placement frame (12) is detachably connected with a pressure-bearing cavity (13) with a hollow inside, liquid inlet holes (14) and liquid outlet holes (17) are respectively formed in the middle positions of the upper end and the lower end of the outer wall of the pressure-bearing cavity (13), the liquid inlet holes (14) are communicated with electromagnetic valves (15), the liquid outlet holes (17) are communicated with vacuum valves (18), the liquid inlet holes (14) are provided with pressure-voltage sensors (16) communicated with the liquid inlet holes, one side of the upper end of the experiment table (1) is provided with a vacuum pump (2), a vacuum tube (21) is detachably connected between an extraction opening of the vacuum pump (2), and the vacuum valves (18), and the other side of the upper end of the experiment table (1) is provided with a pressurizing assembly (4) communicated with the electromagnetic valves (15); One side of pressure-bearing cavity (13) outer wall upper end is installed and is stretched into its inside temperature sensor (22), the opposite side of its outer wall upper end has been offered down observation hole (23), observation hole (23) embedded install with it sealing connection's observation window (24), observation window (24) pass through oxygen-free sealing washer (25) with observation hole (23) interference fit, oxygen-free sealing washer (25) outer wall laminating has modified polytetrafluoroethylene liner (26), a plurality of mounting holes (3) that are equidistant distribution are offered in the position that pressure-bearing cavity (13) outer wall is close to its lower extreme, mounting hole (3) embedded cooperation is installed with it sealing connection and is stretched to in situ conductivity detection module (31) of pressure-bearing cavity (13) inside, one side of experiment table (1) upper end be provided with the overcoat in temperature control subassembly (5) of pressure-bearing cavity (13) outer wall, temperature control subassembly (5) outer wall is provided with the heating compensation subassembly (6) of cooperation sealing connection with it, experiment table (1) upper end be provided with in control panel (7) one side (7) are provided with in control panel (7).
2. 2. The device for testing the in-situ conductivity of the liquid in the ultra-high pressure and low temperature environment according to claim 1, wherein one end of the electromagnetic valve (15) and one end of the vacuum valve (18) extending into the pressure-bearing cavity (13) are respectively provided with a one-way valve (19) communicated with the electromagnetic valve.
3. 3. The device for testing the in-situ conductivity of the liquid in the ultra-high pressure and low temperature environment according to claim 1, wherein the temperature control assembly (5) comprises a liquid nitrogen tank (51), a reflux tank (52), a heat exchange coil (53), a liquid nitrogen pump (54) arranged on one side of the liquid nitrogen tank (51), a liquid inlet pipe (55) communicated with a liquid inlet of the liquid nitrogen pump (54) and extending to the bottom of the inner wall of the liquid nitrogen tank (51), a liquid outlet pipe (56) arranged between a liquid outlet of the liquid nitrogen pump (54) and the lower end of the heat exchange coil (53) and communicated with the liquid outlet pipe, and a reflux pipe (57) arranged between the upper end of the heat exchange coil (53) and the upper end of the outer wall of the reflux tank (52) and communicated with the liquid outlet pipe.
4. 4. The device for in-situ conductivity test of liquid under ultra-high pressure and low temperature environment according to claim 3, wherein the heating compensation component (6) comprises a heating film (61) arranged on the outer wall of the heat exchange coil (53), a heat insulation cushion layer (62) arranged between the heating film (61) and the heating coil, and a heat preservation sleeve (63) arranged on the outer wall of the heating film (61).
5. 5. The device for in-situ conductivity test of liquid under ultra-high pressure and low temperature environment according to claim 1, wherein the in-situ conductivity detection module (31) comprises an insulating ring (32), two working electrodes (33) oppositely installed on the inner wall of the insulating ring (32), two auxiliary electrodes (34) respectively arranged between the two working electrodes (33), insulating sleeves (35) respectively arranged on the outer walls of the working electrodes (33) and the auxiliary electrodes (34), the working electrodes (33), the auxiliary electrodes (34) and the corresponding insulating sleeves (35) are fixed through high-temperature resistant sealant (36), an included angle between the two working electrodes (33) is 180 degrees, and an included angle between the two auxiliary electrodes (34) is 180 degrees.
6. 6. The device for in-situ conductivity test of liquid under ultra-high pressure and low temperature environment according to claim 5, wherein the insulating ring (32) and the insulating sleeve (35) are made of alumina ceramic material, and the working electrode (33) and the auxiliary electrode (34) are made of 99.99% platinum wire.
7. 7. The device for testing in-situ conductivity of liquid under ultra-high pressure and low temperature environment according to claim 6, wherein the outer side of each insulating sleeve (35) is wound with a bulked polytetrafluoroethylene tape (37) to form flexible seal with the inner wall of the corresponding mounting hole (3).
8. 8. The device for in-situ conductivity test of liquid under ultra-high pressure and low temperature environment according to claim 1, wherein the pressurizing assembly (4) comprises a pressurizing pump (41), a pressure buffer (42) communicated with a liquid outlet of the pressurizing pump (41), and a high-pressure pipeline (43) communicated with the pressure buffer (42).
9. 9. The device for testing in-situ conductivity of liquid under ultrahigh pressure and low temperature environment according to claim 1, wherein the pressure-bearing cavity (13) is made of 18Ni300 maraging steel.

Description

Liquid in-situ conductivity test experimental device under ultra-high pressure low-temperature environment Technical Field The invention relates to the technical field of material testing, in particular to a liquid in-situ conductivity testing experimental device under an ultrahigh pressure and low temperature environment. Background Liquid conductivity measurement systems are used to measure the conductivity of water and aqueous or non-aqueous solutions in environments, medical, industrial and other applications where an indication of the ionic content of a liquid is desired, in various scenarios to measure liquid conductivity to provide relatively inexpensive parameters that may be related to the volume ion concentration (bulkionic concentration), in the presence of a single type of ion, conductivity may actually be related to a particular ion concentration, even in the presence of multiple different ionic compounds, measurement of liquid volume conductivity may still provide very useful information. Therefore, the measurement of high pressure and low temperature through the industry of various purposes is widely adopted and utilized, the measurement of high pressure and low temperature is two extremely important conditions for regulating the state of substances and researching novel physical properties, under the synergistic effect of ultrahigh pressure and low temperature, many liquids (especially water) can show singular characteristics which are not available at normal pressure and normal temperature, such as high pressure dense ice, super ionic conductor and the like, the conductivity is a key physical parameter for researching the phase transformation and ion transmission behaviors, and at present, the measurement technology of the conductivity of the liquid is mature, but is limited to normal pressure or medium-low pressure, normal temperature or limited temperature change range, and the in-situ conductivity test under the environment of ultrahigh pressure and low temperature cannot be performed. Disclosure of Invention The invention aims to provide a liquid in-situ conductivity test experimental device under an ultrahigh pressure and low temperature environment, which not only can realize the in-situ conductivity test of liquid, but also can control the change of the temperature and pressure environment of the test and realize the in-situ conductivity test under the ultrahigh pressure and low temperature environment. The technical aim of the invention is realized by the following technical scheme: The utility model provides a liquid normal position conductivity test experimental apparatus under super high pressure low temperature environment, includes the experiment table, places the impedance analyzer in experiment table upper end one side, the upper end of experiment table is provided with the rack, the upper end of rack can be dismantled and be connected with inside hollow pressure-bearing cavity, liquid inlet opening, play liquid hole have been seted up respectively to the intermediate position at pressure-bearing cavity outer wall upper and lower both ends, liquid inlet opening intercommunication has the solenoid valve, liquid outlet opening intercommunication has the vacuum valve, the pressure sensor with it intercommunication is installed to the liquid inlet opening, the vacuum pump is installed to one side of experiment table upper end, the extraction opening of vacuum pump with the cooperation is dismantled between the vacuum valve and is connected with the vacuum tube, the opposite side of experiment table upper end is provided with the pressurization subassembly of solenoid valve intercommunication; The temperature sensor that stretches to its inside is installed to one side of pressure-bearing cavity outer wall upper end, the opposite side of its outer wall upper end has offered the observation hole downwards, the observation hole embedded mounting has the observation window rather than sealing connection, the observation window pass through the anaerobic sealing washer with observation hole interference fit, anaerobic sealing washer outer wall laminating has modified polytetrafluoroethylene liner, a plurality of mounting holes that are equidistant distribution have been seted up to the position that pressure-bearing cavity outer wall is close to its lower extreme, the embedded cooperation of mounting hole is installed rather than sealing connection and stretches to the inside normal position conductivity detection module of pressure-bearing cavity, one side of experiment table upper end be provided with the overcoat in pressure-bearing cavity outer wall's accuse temperature subassembly, accuse temperature subassembly outer wall be provided with its cooperation sealing connection's heating compensation subassembly, experiment table upper end in one side of impedance analyzer is provided with the switch board, be provided with control panel in the switch board. Through adopting above-me