Freezing-thawing test machine

Abstract

The invention relates to a freezing-thawing test machine. The freezing-thawing test machine comprises a test piece box, a control cabinet and a refrigeration system, wherein the control cabinet is disposed at the side of the test piece box and the refrigeration system is also disposed at the side of the test piece box. The refrigeration system comprises a first sub-refrigeration system and a second sub-refrigeration system which are operated individually, wherein the first sub-refrigeration system comprises a first compressor, a first condenser and a plate heat exchanger; the second sub-refrigeration system comprises a second compressor, a second condenser and a plate heat exchanger; the plate heat exchanger plate is disposed close to the box body of the test piece box. By the first sub-refrigeration system and a second sub-refrigeration system which are operated individually, the refrigeration system of the freezing-thawing test machine can realize independent control of refrigeration system, is energy conservation and effectively reduces cost.

Description

technical field [0001] The invention relates to concrete frost resistance test equipment, in particular to a freeze-thaw test machine. Background technique [0002] In order to test the anti-freeze performance of concrete specimens, it is necessary to simulate the temperature change of the natural environment and test the concrete specimens, which is called a freeze-thaw test. The freeze-thaw test consists of multiple freeze-thaw cycles. The freeze-thaw cycle can be divided into many types according to different test requirements. The more typical one is to control the freeze-thaw cycle at 12 hours, which consists of the cooling stage (4 hours), the maintenance stage (3 hours), the heating stage (4 hours) ), holding phase (1 hour). The cooling stage requires time and temperature to change in a linear relationship, that is, within 4 hours, the temperature is uniformly dropped from 20°C above zero to minus 20°C, and then kept at minus 20°C for three hours, and then starts to...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a freeze-thaw test machine, the purpose of which is mainly to solve the problems in the prior art that the refrigeration device of the freeze-thaw test machine consists of only one compressor, the refrigeration time is long, and the energy is relatively wasted.

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