Measuring probe of soil thermal resistivity based on point heat source method

Abstract

The invention discloses a measuring probe of soil thermal resistivity based on a point heat source method, which is in a spheroidal structure and is composed of a hollow metallic spherical shell, an insulated heat-conducting filler, an electric heating appliance and a temperature thermocouple, wherein the metallic spherical shell is provided with a round hole and a strip groove gap; the electric heating appliance is positioned at the center of the metallic ball; the temperature thermocouple probe is arranged in the strip groove gap of the surface of the metallic ball; the inside of the metallic spherical shell is filled with the insulated heat-conducting filler; the electric heating appliance is sealed and positioned through the insulated heat-conducting filler; and the temperature thermocouple probe and the metallic spherical shell are filled with insulation heat conducting filler silicon. The probe can be used for sampling measuring in a laboratory, can directly measure the soil thermal resistivity on site under the condition of not damaging the soil structure, is in particular suitable for the measurement of the soil thermal resistivity in the burying depth range of the facilities such as power cables, heat distribution pipelines and the like.

Description

technical field [0001] The invention relates to a probe device for measuring soil thermal resistance coefficient based on a point heat source method, and belongs to the technical field of measurement. Background technique [0002] The thermal resistivity of soil is one of the basic parameters of soil. There are two methods to determine the thermal resistivity of soil. One is the sampling method, that is, the soil is sampled and measured by instruments in the laboratory. However, the samples in the laboratory cannot accurately reflect the parameters of the on-site soil, and errors will be introduced; another method is to measure the thermal resistivity of the soil on-site. This method can preserve the real soil conditions. The design, construction and management process require real-time and accurate measurement of soil temperature and thermal conductivity. However, there is still a lack of ready-made measuring devices and testing methods in China. [0003] Invention patent...

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Problems solved by technology

[0004] A utility model patent (publication number: CN2310994Y, name: a probe for measuring soil temperature and humidity) discloses a probe capable of measuring soil temperature and humidity, including an inner protective cover with ventilation holes, a humidity sensor, and a switch circuit, the probe is a long cylindrical structure, the main function is to effectively prevent the blockage of the steam hole in the protective cover of the soil, the structure is more complicated, and the on-site detection ability is poor

[0005] Invention patent (publication number: CN 101105467A, name: Soil thermal resistivity measuring device and its method) discloses a soil thermal resistivity measuring device and its method, which can be used to test the ground source heat pump air-conditioning system to discharge or take heat from the soil The thermal resistivity of soil in the two modes is mainly measured for the thermal resistivity of soil at an underground depth of 40-100 meters, but this method does not involve the specific content of the shape and structure of the probe

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