High-efficiency external evaporation heat exchanger with perturbation and safe oil return

Abstract

The invention discloses a high-efficient external pipe evaporation heat exchanger with disturbance and safe oil return, and the invention aims at providing the external pipe evaporation heat exchanger which can prevent hydraulic hit accidents, enhance heat exchange effect and return oil safely. Space between a first seal head and a first pipe plate is divided into a second shunt chamber and a liquid gathering chamber through a first partition board, the space between a second seal head and a second pipe plate is divided into a first shunt chamber and a third shunt chamber through a second partition board, a plurality of vertical heat exchange flat pipes are arranged in parallel and positioned in the lower space in a casing body, one part of the vertical heat exchange flat pipes communicate the second shunt chamber with the first shunt chamber, the other part of the vertical heat exchange flat pipes communicate the second shunt chamber with the third chamber; and a horizontal heat exchange flat pipe is arranged in the upper space in the casing body and communicates the liquid gathering chamber with the third shunt chamber. The space in the casing body of the evaporation heat exchanger is increased and smooth, and the bubble rising resistance out of the heat exchange pipes is reduced, thereby facilitating the rapid rise of bubbles and enhancing the heat exchange effect. The evaporation heat exchanger can avoid the droplet entrainment in gas and prevent the hydraulic hit accidents.

Description

technical field [0001] The invention relates to an external evaporating heat exchanger for cooling refrigerant in a condensing pipe and carrying refrigerant in a cooling pipe used in a refrigeration system. Background technique [0002] In the industrial and commercial fields, the shell-and-tube evaporative heat exchangers used in existing refrigeration systems mainly have the following disadvantages: [0003] 1. The shell and tube outside the tube of the evaporative heat exchanger is filled with refrigerant according to a certain liquid level, and the inside of the shell forms a mist due to disturbance. When it is easy to entrain liquid droplets, it will cause liquid hammer accidents of the compressor. [0004] 2. For the working medium that absorbs heat and evaporates in the large space between the shell and tube, the lubricating oil is either suspended on the surface of the liquid or deposited under the liquid, and the oil is carried by the compressor to suck the gas, so...

AI Technical Summary

Problems solved by technology

[0003] 1. The shell and tube outside the tube of the evaporative heat exchanger is filled with refrigerant according to a certain liquid level, and the inside of the shell forms a mist due to disturbance. It is easy to entrain liquid droplets, causing liquid hammer accidents of the compressor

[0004] 2. For the working medium that absorbs heat and evaporates in the large space between the shell and tube, the lubricating oil is either suspended on the surface of the liquid or deposited under the liquid, and the oil is carried by the compressor to suck the gas, so the lubricating oil cannot return to the compression in time and smoothly machine, the amount of lubricating oil in the compressor cannot be guaranteed

[0005] 3. If the heat exchange tube used in the evaporative heat exchanger is longer, it is necessary to install a support plate to reduce the heat exchange area. More material, more weight

[0006] 4. The evaporative heat exchanger adopts the structure of staggered arrangement of circular heat exchange tubes, which is not conducive to the rise of air bubbles and affects the heat exchange effect

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