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U-shape tube type heat exchanger

A heat exchanger and U-shaped tube technology, applied in the field of heat exchangers, can solve the problems of high manufacturing cost, low heat exchange efficiency, complex heat exchanger structure, etc., to save manufacturing costs, enhance heat exchange, and improve emission performance The effect of indicators

Active Publication Date: 2009-02-11
辽宁联友博科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first type is the plate-fin heat exchanger, which is composed of many thin plates and the secondary surface between the plates. The secondary surface not only acts as a ribbed surface, but also plays the role of tube-sheet spacing and enhances rigidity. This type of heat exchanger The structure of the switch is complex and the manufacturing cost is high
[0006] The second type is the shell-and-tube heat exchanger, and the shell-and-tube heat exchanger is provided with many parallel tubes in a cylindrical shell (these parallel tubes are called tube bundles), and the hot and cold fluids are separated from the space in the tubes. (tube side) and the space outside the tube (shell side) flow through for heat exchange; usually a longitudinal partition parallel to the tube bundle or a baffle perpendicular to the tube bundle is installed on the shell side; to increase the flow velocity of the fluid and enhance the disturbance, Improve heat transfer efficiency; this type of heat exchanger has a simple structure, but the heat transfer efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] see figure 1 and figure 2 , wherein an opening is provided at one end of the shell 1, and a tube plate 3 is provided at the opening, and the tube plate 3 faces the shell side as the inner side, and the exhaust gas inlet pipe 7 and the exhaust gas outlet pipe are respectively connected to the two ends of the outer side of the tube plate 3 8. The connection ports between the inlet pipe 7 and the outlet pipe 8 and the tube sheet 3 are trumpet-shaped; the end faces of the inlet pipe 7 and the outlet pipe 8 of the tube sheet 3 are provided with through holes for fixing the U-shaped heat exchange tube 2; The heat pipe 2 is composed of two equal-length straight pipe sections 22 and a curved section 23 smoothly connected, and the shape is U-shaped; the two nozzles on the U-shaped heat exchange tube 2 are respectively welded on the corresponding tube sheet 3 and fixed in the shell 1 parallel to each other; a cooling medium inlet 5 is provided on the shell 1 close to the air in...

Embodiment 2

[0042] see figure 1 and image 3 , in order to reduce the difficulty of processing, no spiral groove is provided at the bending section 23 of the U-shaped heat exchange tube 2 fixed in the housing 1 .

[0043] see Figure 4 to Figure 8 , The vertical section of the U-shaped heat exchange tube 2 fixed in the casing 1 can have various shapes.

[0044]The heat exchange tubes arranged in the shell 1 with a flat cross-sectional shape and spiral grooves are compared with the circular heat exchange tubes with spiral grooves in the cross-sectional shape: First, when the cross-sectional area of ​​the heat exchange tubes is constant and the flow rate of the heat exchange medium is not Under the premise of changing, the cross-sectional perimeter of the flat tube is larger than that of the round tube, so the heat transfer area of ​​the flat tube is larger than that of the round tube, which in turn increases the heat transfer area of ​​the entire heat exchanger. Under the premise that t...

Embodiment 3

[0046] see figure 1 and Figure 4 , the U-shaped heat exchange tube 2 fixed in the shell 1 is Figure 4 The U-shaped heat exchange tube 2 shown in the first cross-sectional shape, the U-shaped heat exchange tube 2 has a flat cross section, the two opposite long sides 25 are straight lines, and the two opposite short sides 24 are arc-shaped from the inside to the outside It is convex and is connected with the long side 25 in a circular arc shape. Such a setting makes full use of the surface of the heat exchange tube to achieve heat exchange with maximum efficiency, and is easy to produce and process.

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Abstract

The invention relates to a U-shape pipe heat exchanger suitable for exhaust gas recirculation cooling device in automobile engine system. The invention comprises shell and heat exchanging pipe. On the shell one end is opened and at the position of port pipe plate is set. Inlet and outlet pipes of heat exchanging medium are connected on the pipe plate. Via holes for fixing U-shape heat exchanging pipes are set at connecting ports of inlet and outlet pipes on the pipe plate. The heat exchanging pipe is constituted by elbow and straight pipe to form U-shape. Two pipe ports f said heat exchanging pipe are welt on the pipe plate and corresponding fixing via hole and they are fixed in shell in parallel. The invention can improve heat exchanging efficiency by 25-40%, decrease emission of NOx in automobile engine, and shorten length and cubage of heat exchanger. The invention is provided with simple and compact structure, low scaling and low manufacture and maintenance cost.

Description

technical field [0001] The invention relates to a heat exchanger, in particular to a U-shaped tube heat exchanger, which is suitable for use in an exhaust gas recirculation system of an automobile engine, and is used as a cooler for reducing nitrogen oxide (NOx) emissions , is also suitable for use as an intercooler in a turbocharger system to improve engine performance. Background technique [0002] Heat exchangers are used in various industrial sectors such as power, metallurgy, chemical industry, oil refining, construction, machinery manufacturing, food, medicine and aerospace. Therefore, the optimal design of heat exchangers is particularly important for various industries. With increasingly stringent emission standards around the world, heat exchangers in automotive exhaust gas recirculation cooling systems are critical. [0003] Exhaust gas recirculation cooling technology is in the well-known automobile engine exhaust gas recirculation system. Part of the exhaust ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28D7/10
Inventor 景建周景建坤杨晓瑷沈董浩汤俊洁
Owner 辽宁联友博科技有限公司
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