CN-224231555-U - Dynamic pressure temperature-changing liquid surface tension testing device

Abstract

The utility model belongs to the field of surface tension testing, and particularly discloses a dynamic pressure variable temperature liquid surface tension testing device, which comprises a vacuum box, a temperature adjusting module and a testing platform module; the temperature regulating module comprises a condenser, a compressor, a fan, a heating resistance wire, a filter, a cold-heat exchanger, a capillary tube and an evaporator, and is arranged at the upper part of the vacuum box and can exchange heat with the lower part of the vacuum box. The utility model relates to a device and a method for measuring the surface tension of liquid under different pressure and different temperature conditions, which are helpful for understanding the physicochemical properties of the liquid, optimizing relevant industrial processes, improving the performance of fire extinguishing materials, predicting and understanding the thermodynamic behavior of the liquid, and the like, and have profound effects on scientific research and industrial application.

Inventors

• ZHU XINHUA
• HUANG HE
• TANG SHUPEI
• ZHANG YUQIANG
• JIA XUHONG
• LIU ZIHAO
• PAN XI
• DENG RUOFAN

Assignees

• 中国民用航空飞行学院

Dates

Publication Date

20260512

Application Date

20250317

Claims (6)

1. 1. The dynamic pressure variable temperature liquid surface tension testing device is characterized by comprising a vacuum box, a temperature adjusting module and a testing platform module; The temperature regulating module comprises a condenser (1), a compressor (2), a fan (3), a heating resistance wire (4), a filter (8), a cold-heat exchanger (9), a capillary tube (10) and an evaporator (11), wherein the whole body formed by the condenser (1), the compressor (2), the fan (3), the filter (8), the cold-heat exchanger (9), the capillary tube (10) and the evaporator (11) is arranged in a metal protective shell and arranged at the upper part of the vacuum box, and can exchange heat with the lower part of the vacuum box.
2. 2. The dynamic pressure temperature change liquid surface tension testing device according to claim 1, wherein the compressor (2) is connected with the fan (3), heat dissipation is carried out on the compressor (2) through the fan (3), the compressor (2) is respectively connected with the condenser (1) and the evaporator (11), the evaporator (11) is connected with the cold heat exchanger (9), the cold heat exchanger (9) is connected with the capillary tube (10), the capillary tube (10) is connected with the dry filter (8), and the dry filter (8) is connected with the condenser.
3. 3. The dynamic pressure temperature change liquid surface tension testing device according to claim 1, wherein the heating resistance wire (4) is arranged on the inner wall of the lower part of the vacuum box, the vacuum pump (7) is arranged outside the vacuum box, the vacuum pump (7) is connected with the air suction hole (6), and the vacuum box can be vacuumized by controlling the vacuum valve (18) and the air discharge hole (12) which are positioned on the outer wall of the vacuum box.
4. 4. The dynamic pressure temperature changing liquid surface tension testing device as set forth in claim 1, wherein a vacuum gauge (13) capable of reading the pressure in the box at any time is further arranged on the outer wall of the vacuum box.
5. 5. The dynamic pressure temperature change liquid surface tension testing device according to claim 1, wherein the testing platform module comprises an electromagnetic force balance sensor (5), a hook (20), a balancer (21), a platinum ring (23), a temperature sensor (22), a surface dish (24), a lifting platform (15), a level meter (16) and a motor (17).
6. 6. The dynamic pressure temperature changing liquid surface tension testing device according to claim 5, wherein the electromagnetic force balance sensor (5) is connected with the hook (20) through the balancer (21), the platinum ring (23) is arranged on the hook (20), a temperature sensor (22) is arranged behind the hook (20), the surface dish (24) is arranged on the electrified heating lifting platform (15), a level meter (16) is arranged outside below the electrified heating lifting platform (15), and the lifting platform (15) is connected with the motor (17).

Description

Dynamic pressure temperature-changing liquid surface tension testing device Technical Field The utility model relates to the technical field of dynamic pressure variable temperature liquid surface tension test, in particular to a dynamic pressure variable temperature liquid surface tension test device. Background The fire extinguishing agent has various types and different performances, wherein the core component surfactant of the foam fire extinguishing agent has the function of reducing the surface tension of aqueous solution, can generate a condensed foam floating layer on the surface of the combustion liquid to isolate air and reduce the temperature of a combustion area, is a main fire extinguishing material for extinguishing fuel fires, and is widely applied to the fields of petrochemical enterprises, solvent factories, oil fields, oil reservoirs, automobile houses, airports and the like. However, the areas of China are wide, the geographical environment is complex, the pressure difference between the plateau and the plain is obvious, and the temperature difference between the winter and the summer of the south and the north is obvious, so that the surface tension performance of the surfactant is influenced, and the fire extinguishing performance of the foam extinguishing agent is further influenced. Therefore, the detection of the surface tension of different foam extinguishing agents under different pressures and temperatures has important significance on the extinguishing effectiveness of the foam extinguishing agents. Surface tension is a force that acts on the surface of a liquid to reduce the surface area of the liquid. Because the surface of the liquid, which is in contact with the gas, is provided with a thin layer, called a surface layer, molecules in the surface layer are sparse compared with the inside of the liquid, the distance between the molecules is larger than the inside of the liquid, and the interaction between the molecules is expressed as attractive force, namely surface tension. The surface tension test method mainly comprises a platinum plate method, a platinum ring method, a hanging drop method, a bubble pressure method, a dropping weight method, a capillary rising method, a maximum bubble pressure method and the like, when the platinum ring method is used for testing, the platinum ring is immersed under the liquid level (or an interface of two immiscible materials) for 2-3mm, then the platinum ring is slowly lifted upwards, and a film is formed between the platinum ring and the liquid level. The maximum force value of the membrane acting on the ring in the whole platinum ring lifting process is measured and converted into a real surface (interface) tension value. In the prior art, as disclosed in the Chinese patent publication No. CN202320634193, a temperature-changing liquid surface tension coefficient measuring instrument is designed, an experimental device for measuring the temperature-changing liquid surface tension coefficient is designed, and a measuring device with clear principle, simple structure and convenient use is provided. The device regulates the temperature of liquid through a heating water tank, and uses a pull-off method to measure the surface tension coefficients at different temperatures. Meanwhile, the photoelectric door component and the singlechip control system are utilized to accurately detect the height and tension change of the liquid film, so that high-precision measurement is realized. Through the device, the surface tension coefficient of the liquid can be obtained at different temperatures, meanwhile, the lifting of the liquid level can be conveniently and stably regulated, and the measuring accuracy and repeatability are improved. The Chinese patent with publication number of CN215004844U discloses a vacuum high-temperature surface tension meter, designs a vacuum high-temperature surface tension meter, solves the problem of oxidation of graphite flakes, ensures accurate and effective test data, and provides feasibility for surface tension test of easily oxidized samples. The device draws air through the vacuum hood, and inert gas fills supplementary exhaust air in the vacuum hood, makes the test substrate test under the protection of no oxidizing gas and inert gas, solves the oxidation problem of surface tension test substrate, reduces the heating furnace body outside temperature through water cooling, prevents equipment accelerated aging or damage, protects the operator simultaneously from scalding. The photographing window has the function of replacing transparent quartz glass, and is convenient for subsequent maintenance and replacement. However, the device of CN215004844U can only test the surface tension under vacuum condition, has no function of measuring the surface tension under different pressure conditions, is used for measuring the surface tension of materials under high temperature (more than 1000 ℃) under vacuum condition, is not app