Freezing plate for cooling soil body and temperature control system

Abstract

The invention relates to a freezing plate for cooling a soil body and a temperature control system, which comprise a freezing plate, temperature detection devices, a controller, an electronic expansion valve, a refrigeration system, an evaporator and a reservoir. The refrigeration system refrigerates a refrigerant in the evaporator; the evaporator carries out heat exchange with refrigerating fluid in the reservoir so as to lower the temperature of the refrigerating fluid; the low-temperature refrigerating fluid flows into the freezing plate, and the soil body is refrigerated by the freezing plate; and the two temperature detection devices are respectively arranged in the refrigerating fluid on the freezing plate and in the reservoir, the collected temperature signals are fed back to the controller, the condition that the opening degree of the electronic expansion valve is changed between 0 percent and 100 percent is determined according to an average value after an internal program ofthe controller carries out weighted average on the temperature signals, and the opening degree also determines the regulation of the refrigerating capacity of the evaporator, so that the temperaturesof the refrigerating fluid and the freezing plate can be strictly controlled. The invention has the advantages of high cooling speed, no need for a heating device, energy conservation and the like, cools the soil body directly and can form a plurality of uniform and stable temperature boundary conditions.

Description

technical field [0001] The invention relates to a freezing plate and a temperature control system for cooling soil. Background technique [0002] The Golmud-Lhasa section of the Qinghai-Tibet Railway, which has attracted worldwide attention, has a total length of 1,118 kilometers. Among them, the length of the permafrost zone is 632 kilometers. Frozen soil is the main problem that must be solved in the construction and safe operation of the Qinghai-Tibet Railway. To understand the nature of frozen soil, field test is the most direct method. However, the field test period is long and the cost is high. Therefore, indoor model test is an essential means of frozen soil research. In the indoor model test of frozen soil, the soil must be cooled by artificial freezing, and the temperature boundary conditions must be strictly controlled, so that the cooling process of the soil can simulate the actual situation well. [0003] The usual permafrost model test devices use air cooling...

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Problems solved by technology

The above method has the following defects: because the indirect cooling method is adopted, the cooling speed of the soil is slow; the ambient temperature is controlled by air flow, the temperature field is not easy to be uniform, and the fluctuation is large; and only one temperature boundary condition can be set; To reduce the ambient temperature, and at the same time, heating devices are required, and the energy requirements are relatively high

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