Discuss the refrigeration system of the ozone aging test chamber

Zhejiang ozone aging box is used to test the degree of damage of
rubber products such as vulcanized rubber, thermoplastic rubber, cable insulation sheath and other products in the ozone environment.

Ozone content in the atmosphere is very small but is the main factor of rubber cracking, ozone aging box simulation and strengthening of ozone conditions in the atmosphere, study the law of ozone on rubber, rapid identification and evaluation of rubber anti-ozone aging performance and anti-ozone agent protection efficiency of the method, and then take effective anti-aging measures to improve the service life
of rubber products.

Ozone aging of rubber is a surface reaction, the occurrence of ozone cracking requires a certain amount of stress or strain, the surface of the unextruded rubber ozone aging after the formation of a frost-like gray-white hard brittle film
.

Under the action of stress or strain, the film cracks ozone cracks, and the crack direction of the crack is perpendicular to the direction of
the force.

The cracking time of various rubbers is significantly shortened with the increase of ozone concentration, but the degree varies depending on the variety of rubber
.

Ozone concentrations also affect crack growth rates
.

Analysis of the refrigeration system of Shanghai ozone aging test chamber: 1.
Refrigeration system and compressor In order to ensure the requirements of the test chamber for cooling rate and low temperature, the refrigeration system of the test chamber adopts a cascading refrigeration system composed of imported compressors, which has the advantages
of reasonable matching, high reliability, convenient use and maintenance.

2.
Refrigeration principle The refrigeration cycle adopts the reverse carro cycle, which is composed of two isothermal processes and two insulation processes, the process is as follows: The refrigerant is compressed to a higher pressure by the compressor insulation, and the exhaust temperature is increased by consuming the work, and then the refrigerant is isothermal and the surrounding medium is heat exchange to the surrounding medium to transmit heat to the surrounding medium
.

After the refrigerant is insanely expanded by the interceptor valve, the refrigerant temperature decreases
.

Finally, the refrigerant absorbs heat from the higher temperature object through the evaporator isotherm, so that the temperature of the cooled object is reduced
.

This cycle repeats itself in order to achieve the purpose
of cooling.

The design of the refrigeration system applies energy regulation technology, an effective treatment method can not only ensure that in the case of normal operation of the refrigeration unit, but also effectively adjust the energy consumption and refrigeration capacity of the refrigeration system, so that the operating cost of the refrigeration system is reduced to a more economical situation
.