A multi-shell tube flooded heat exchanger

Abstract

The invention discloses a multi-shell tube flooded heat exchanger, which comprises a plurality of shell tubes distributed in an array, a plurality of heat exchange tubes passing through each shell tube, and a tube respectively connected and communicated with two ends of each shell tube. The first outer tube box and a second outer tube box are respectively connected to the two ends of each heat exchange tube and are respectively connected to the first outer tube box and the two tube sheets connected to the outside of the second outer tube box, and are respectively connected to two A first inner tube box and a second inner tube box outside the tube sheet; the lower part of the first outer tube box is connected with a refrigerant inlet connection pipe, and the upper part of the second outer tube box is connected with a refrigerant outlet connection pipe. The heat exchanger is a flooded heat exchanger in which the refrigerant goes through the shell side and the refrigerant goes through the tube side. Through the structure of the heat exchange tube in the shell and tube, the refrigerant charge is much less than that of the ordinary flooded evaporator. And the oil return performance is good.

Description

technical field [0001] The invention belongs to the field of heat exchangers of refrigeration equipment, and in particular relates to a multi-shell tube flooded heat exchanger which can be used as a condenser or an evaporator. Background technique [0002] The existing technology adopts flooded evaporators with large shells and large spaces, which are generally used in larger cold and hot water units, such as screw chillers and centrifugal chillers, and generally used in smaller scroll chillers. Use dry evaporation, or directly borrow the design method of flooded evaporator for larger units. This method is generally adopted because it has the advantages of high energy efficiency, low cost, and relatively mature technology when used on larger units. However, using this method for scroll chillers will result in high cost and difficulty in oil return. It is necessary to install secondary oil separation and an ejector oil return system. In this way, although the energy efficie...

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Problems solved by technology

However, the use of this method for scroll chillers will result in high cost and difficulty in oil return. It is necessary to install secondary oil separation and an ejector oil return system.

In this way, although the energy efficiency of the small flooded unit is slightly improved, the cost of the unit is increased by a large proportion, and the economy is not good.

At the same time, oil return and ejection will cause part of the refrigerant to return directly to the compressor without heat exchange, resulting in a large loss of cooling capacity, and the energy efficiency is very limited compared with the dry-type unit.

At the same time, the stability of the oil return system is not very good.

Because the traditional flooded evaporator has a large shell, the 50% liquid charge of the evaporator makes the cooling charge large, which is 60% more than the dry evaporator, and the cost remains high

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