A shell and tube heat exchanger

Abstract

The invention discloses a shell-and-tube heat exchanger, which comprises a liquid separator assembly, a gas collection assembly, a tube plate, a shell installed on the tube plate, and a heat exchange tube located in the shell; the shell and the tube plate surrounded The space is formed as a heat exchange chamber; each set of heat exchange tubes includes a first heat exchange tube and a second heat exchange tube, and one end of the first heat exchange tube is connected to one end of the second heat exchange tube through a pipe fitting; the liquid separator assembly is installed On the tube plate, the liquid separator assembly is connected with a first fluid pipe, the first fluid nozzle of the first fluid pipe is located outside the heat exchange chamber, and the first heat exchange pipe is connected to the liquid separator assembly; the gas collection assembly is installed on On the tube plate, the gas collection assembly is connected with a second fluid pipe, the second fluid nozzle of the second fluid pipe is located outside the heat exchange chamber, and the second heat exchange pipe is connected to the gas collection assembly. In this application, the liquid separator assembly can eliminate the gas-liquid separation of the refrigerant, and more evenly distribute the refrigerant to each group of heat exchange tubes, so that each group of heat exchange tubes can evenly and fully exert their capacity, thereby improving the performance of the heat exchanger. efficiency.

Description

technical field [0001] The invention relates to a shell-and-tube heat exchanger, belonging to the field of air-conditioning heat exchangers. Background technique [0002] A shell and tube heat exchanger is a partitioned heat exchanger that uses the wall of the tube bundle enclosed in the shell as the heat transfer surface, mainly including tube sheets, shells, baffles, heat exchange tubes, tube boxes, partitions, Tube-side inlet, tube-side outlet, shell-side interface and other parts. [0003] The shell of the heat exchanger is generally cylindrical, with a number of heat exchange tubes inside; the heat exchange tubes are fixed on the tube sheet with holes; the tube box and partition are arranged outside the tube sheet, and the refrigerant enters the exchange After the heater, the tube box distributes the refrigerant to each heat exchange tube, and the partition in the tube box plays the role of changing the flow direction of the refrigerant in the tube and increasing the l...

AI Technical Summary

Problems solved by technology

In the prior art, the inlet tube box of the shell-and-tube heat exchanger is provided with a mesh plate, which has the function of dispersing and evenly distributing the refrigerant to a certain extent, but it cannot improve the distribution of the gas-liquid phase of the refrigerant. There are many phase components, and the gas phase components of the upper heat exchange tubes are too high, which will make the performance insufficient. However, the higher the degree of uniform distribution and distribution of the refrigerant, the better the balance of the capacity of each tube of the heat exchanger and the full performance of the heat exchanger.

[0006] On the other hand, due to the structural size limitation of the system where the heat exchanger is located and the product, the shell-and-tube heat exchanger is sealed into several spaces by adding tube boxes and baffles to make the refrigerant go back and forth in the heat exchange tubes to meet the heat exchange requirements. However, the more times the heat exchange tubes go back and forth, the longer the heat exchange tubes and the more tube passes, the more tube boxes, partitions and sealing surfaces will be generated; especially, there are two or more sets of shell-and-tube heat exchangers. In the case of refrigerant heat exchange tube groups that are not connected to each other and have their own inlets and outlets, the number of sealed separation surfaces between the tube box, separator, tube sheet and the three will also increase exponentially, such as a shell-and-tube replacement When the heat exchanger has two groups of heat exchange tube groups that are not connected to each other and each has an inlet and an outlet, the number of tube boxes and partitions needs to be multiplied by two, and the sealing surface is also doubled; usually the refrigeration in the heat exchange tube The working pressure of the agent is high, and leakage is easy to occur. This requires high sealing and isolation between the tube sheet, tube box and partition, which makes the manufacturing and processing of the heat exchanger complicated and high in cost.

[0007] Due to the large volume and large external area of ​​the tube box, the refrigerant and the external environment have heat exchange to the external environment outside the tube box, resulting in additional heat loss, reducing the efficiency of the heat exchanger, and increasing the heat exchanger insulation cost

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