Multifunctional temperature control double-cavity pressure chamber

Abstract

The invention discloses a multifunctional temperature control double-cavity pressure chamber. The multifunctional temperature control double-cavity pressure chamber comprises a temperature control system and a pressure chamber system, wherein the temperature control system comprises a thermostatic box (1), a first temperature sensor (2-1), a second temperature sensor (2-2), a third temperature sensor (2-3) and a water bath circulating copper pipe (3); the pressure chamber system is mounted in the thermostatic box (1) and comprises a pressure chamber base (11), an organic glass cylinder (5) mounted on the pressure chamber base (11), an aluminum alloy cylinder (7) located in the organic glass cylinder (5) and an upper cover (4) mounted at the tops of the organic glass cylinder (5) and the aluminum alloy cylinder (7). The multifunctional temperature control double-cavity pressure chamber is reasonable in structural design, simple to operate, wide in application range, high in automation degree, high in stability and long in service life and can implement various test operation processes.

Description

technical field [0001] The invention relates to a multifunctional temperature-controlled double-chamber pressure chamber, in particular to a multi-functional double-chamber pressure chamber structure capable of realizing high precision and temperature control. Background technique [0002] In geotechnical tests, the pressure chamber is an indispensable part of simulating the actual engineering environment. By applying external loads such as ambient pressure, vertical stress, osmotic pressure and matrix suction to the sample in the pressure chamber, it can effectively simulate the natural state of the rock. The stress distribution of the soil material can be used to conduct in-depth research on the shape and behavior characteristics of the sample, such as mechanics, penetration, and piping. [0003] Usually, the test time required for most geotechnical tests ranges from 2-3 days to as long as 12 months. Under the long-term test load, the structure of the pressure chamber will...

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Problems solved by technology

[0003] Usually, the test time required for most geotechnical tests is as little as 2-3 days and as long as 12 months. Under the long-term test load, the structure of the pressure chamber will undergo fatigue deformation, and most of the pressure chambers are single-cavity structures. At this time, it will not be possible to Effectively avoid the impact of this part of the deformation on the test results, especially the impact on the sample volume measurement, which will reduce the accuracy of the test; and the upper structure and base of the pressure chamber are fixed by three bolts, which is inconvenient to install. Both are prone to water leakage, which affects the effective conduct of the test; at the same time, most of the test instruments use external load sensors to contact the sample back pressure cap through the central rod. During the test, with the effect of the confining pressure, the central rod and the There will be different degrees of friction between the sealing seats, and it is easy to produce eccentricity to generate additional effects

[0004] For the temperature control in the test, temperature control equipment such as electric heating plates, resistance wires and water baths are often used to control the temperature of the pressure chamber, but there are certain disadvantages, such as electric heating plates and resistance wires can only control heating, but cannot The simulation of low temperature environment, and the control accuracy is low, the water bath can control the heat and cold, but only the water bath is used for loading, since the outer wall is wrapped with heat insulation material, when the difference between the ambient temperature and the control temperature of the pressure chamber is large, a temperature gradient will be generated in the pressure chamber cavity , the temperature cannot be precisely controlled, and it is difficult to accurately control the sample temperature for a long time

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