Mixing apparatus used for ternary one-time foaming for refrigerator

Abstract

The invention discloses a mixing apparatus used for ternary one-time foaming for a refrigerator. The mixing apparatus includes a static mixer. A polyether pipeline, a pentafluoropropane pipeline and a cyclopentane pipeline are arranged in and are communicated with the static mixer. A two-way valve, a pressure meter, a flow rate meter and a three-way valve are disposed respectively in each of the three pipelines. A material line is disposed in the three-way valve of each pipeline. The ternary one-time mixing foaming apparatus has stable and high-effective mixing effect and advanced mixing technology. A foamed product has excellent efficiency after mixing, is improved in heat insulation performance, is reduced in foaming usage amount, and is reduced in corrosion cracking probability.

Description

technical field [0001] The invention relates to a mixing device for three-way primary foaming in a refrigerator. Background technique [0002] At present, most of the refrigerator foaming process adopts binary primary foaming mixing device. The advantage of this equipment is that it is easy to operate, but the foamed products produced have the following disadvantages: 1. Poor heat preservation effect: binary primary foaming agent is generally used, The thermal conductivity of the alkane blowing agent is relatively high, and after the polyurethane insulation foam is produced through the mixed reaction, the overall insulation effect of the insulation layer is poor. 2. The amount of foaming is large: the boiling point of the alkane foaming agent is relatively high (generally over 40°C), and it is a liquid at normal temperature and pressure. Therefore, the foaming hole bears a large pressure and requires a high density to prevent the foam from shrinking. Therefore consumption i...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the refrigerator foaming process adopts binary primary foaming mixing device. The advantage of this equipment is that it is easy to operate, but the foamed products produced have the following disadvantages: 1. Poor heat preservation effect: binary primary foaming agent is generally used, The thermal conductivity of the alkane blowing agent is relatively high, and after the polyurethane insulation foam is produced through the mixed reaction, the overall insulation effect of the insulation layer is poor

2. The amount of foaming is large: the boiling point of the alkane foaming agent is relatively high (generally over 40°C), and it is a liquid at normal temperature and pressure. Therefore, the foaming hole bears a large pressure and requires a high density to prevent the foam from shrinking. Therefore, the dosage is large and the overall cost is high

3. Strong swelling performance: alkane is liquid at room temperature, has strong swelling performance, and has a certain corrosion performance on the foam lining, which increases the probability of corrosion and cracking of the foam lining. Foam corrosion cracking has become a feedback from the refrigerator aftermarket. one of the main problems

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