Mixed working medium refrigerating system capable of rapidly starting low-temperature storage box and control method

Abstract

The invention discloses a mixed working medium refrigerating system capable of rapidly starting a low-temperature storage box and a control method. The system comprises a compressor, a condenser, a heat regenerator, a temperature sensor, a two-position three-way electromagnetic valve, a short capillary tube, a one-way valve, an evaporator and a long capillary tube. According to the system, the two-position three-way electromagnetic valve and the one-way valve are arranged, so that switching between a starting mode and a refrigerating mode is achieved; when the system is in a starting mode, the two-position three-way electromagnetic valve supplies liquid to the short capillary tube, the flow of a mixed working medium entering the heat regenerator is increased, the temperature of an outlet of the heat regenerator is rapidly reduced, therefore, high-boiling-point components in the system are gradually condensed, and the pressure of the high-pressure side in the starting stage is greatly reduced; when the system is in a refrigeration mode, the two-position three-way electromagnetic valve supplies liquid to the long capillary tube and the evaporator, so that low-boiling-point components in the system are gradually condensed, and the refrigeration temperature is further reduced. The invention further provides a control method of the system, so that rapid starting and reliable and efficient continuous operation of the low-temperature storage box are effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of refrigeration and low temperature, and in particular relates to a mixed working medium refrigeration system and a control method applied to the quick start of a low temperature preservation box (refrigerator or freezer, etc.). Background technique [0002] In recent years, scholars have carried out a lot of research on the application of non-azeotropic mixed refrigerants in low-temperature refrigeration systems. There is a temperature glide in the process of condensation and evaporation of mixed refrigerants, and Lorentzian can be realized in traditional vapor compression refrigeration systems. Circulation, the temperature glide of the working fluid during the condensation and evaporation process reduces the heat transfer temperature difference and reduces the irreversible loss, so it is beneficial to the improvement of system performance. The throttling refrigeration system using mixed working fluid has ...

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Problems solved by technology

[0003] However, the mixed working fluid throttling refrigeration system has the problem of high exhaust pressure and difficulty in starting the system at the initial stage of start-up

This is because at the initial stage of the start-up of the refrigeration system, the overall refrigeration temperature of the system is high, and the mixed working fluid cannot be condensed normally in the condenser, which will cause the pressure on the high-pressure side of the system to rise continuously. When the pressure on the high-pressure side exceeds the limit value, it will cause the pipe Road breaks and causes serious accident

The existing technology usually uses expansion vessels to store excess working fluid, but this also brings disadvantages such as complex systems and large volumes

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