Exhaust injection cooling device

Abstract

The invention discloses an exhaust injection cooling device comprising a condenser, a compressor, a venturi pipe injector and an injection pump, wherein an exhaust pipe of the compressor is connected with the inlet of the venturi pipe injector, and the outlet of the venturi pipe injector is connected with the inlet or the middle of the condenser; a first inlet of the injection pump is connected with the exhaust pipe of the compressor or an exhaust opening inside the compressor, a second inlet of the injection pump is connected with a liquid outlet of the condenser, and the outlet of the injection pump is connected with a middle connector of the venturi pipe injector. The exhaust injection cooling device has a structure with both the injection pump and the venturi pipe injector so that theliquid injection efficiency is greatly improved. The neck of a venturi pipe has larger diameter to cause small exhaust pressure drop. The device does not need to increase the external power and has the advantages of high efficiency, energy saving, simple structure and low cost.

Description

【Technical field】 [0001] The invention relates to an exhaust ejection cooling device used in a refrigeration unit, in particular to a double-effect Venturi tube ejection device for ejecting condensed liquid in a refrigeration unit to reduce exhaust temperature and improve condensation heat exchange efficiency. 【Background technique】 [0002] When the refrigeration unit is running, the high-temperature refrigerant gas discharged from the compressor needs to be condensed into a medium-temperature refrigerant liquid through the condenser. heat, liquid refrigerant subcooling heat exchange and other three processes. Among them, the heat transfer efficiency of the cooling heat exchange of the superheated refrigerant gas is much lower than that of the phase transformation heat. By spraying liquid refrigerant into the superheated refrigerant gas, the refrigerant entering the condenser becomes saturated steam, and the refrigerant enters the condenser. After the condenser, the phase ...

AI Technical Summary

Problems solved by technology

This method has the following problems: 1. It is necessary to add a mechanical pump with complex structure, high cost, and low cost performance; 2. The mechanical pump needs to be driven by external power, which increases the energy consumption of the refrigerant; 3. Due to the supercooling of the condensed refrigerant liquid The temperature is small, it is easy to vaporize inside the pump, which will cause damage to the pump body, and the delivery volume of the pump will be greatly reduced after the refrigerant is vaporized; 4. Since the pressure and temperature of the delivery fluid are relatively high, the pump High requirements; 5. The device is prone to failure and difficult to maintain

The structure of this method has the following disadvantages: a high-pressure gas source is required, and there is a certain pressure difference at the inlet of the compressor outlet pressure box of the refrigeration unit, but generally the pressure difference is small, so the direct use of the compressor exhaust Gas is used as power for ejection, and the amount of liquid refrigerant ejected is very small

There are also some disadvantages in this method: 1. In order to make the injected refrigerant liquid have a sufficient amount, it is necessary to make the refrigerant gas have a higher flow rate at the throat, and the refrigerant gas changes from low flow rate to high flow rate to low flow rate. This process produces a large pressure drop

The pressure difference between the compressor discharge pressure and the condensing pressure is large

2. When the refrigerator is unloaded, the exhaust flow rate of the compressor decreases, causing the ejected liquid refrigerant flow to fail

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