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Flat-shaped groove heat exchange tube and heat exchanger using the same

A technology of heat exchange tubes and flat shapes, which is applied in the field of heat exchangers of exhaust gas recirculation coolers, can solve the problems of reduced heat exchange efficiency of heat exchangers, achieve improved heat exchange effects, increase reliability, and reduce maintenance costs Effect

Active Publication Date: 2009-04-22
BEIJING U BRIDGE CHAOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the heat exchange tubes are too dense, the two bulging heat exchange tubes may squeeze together, blocking the flow of the heat exchange medium outside the heat exchange tubes, resulting in a decrease in the overall heat exchange efficiency of the heat exchanger
Need to propose a new type of heat exchange tube to overcome the shortcomings of heat exchange tube deformation

Method used

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  • Flat-shaped groove heat exchange tube and heat exchanger using the same
  • Flat-shaped groove heat exchange tube and heat exchanger using the same
  • Flat-shaped groove heat exchange tube and heat exchanger using the same

Examples

Experimental program
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Effect test

Embodiment 1

[0033] This embodiment is a flat groove heat exchange tube, which includes a stainless steel tube body with a cross-sectional shape of different height and width. The upper and lower surfaces between the grooves are provided with outwardly protruding bulges.

[0034] see figure 1 , figure 2 and image 3 , figure 2 is a perspective view of a flat grooved heat exchange tube with a cross-sectional shape, image 3 It is a partial enlarged view of the flat heat exchange tube, figure 1 It is a heat exchanger using flat heat exchange tubes. The heat exchanger is mainly composed of a shell 1, a heat exchange tube 2, a tube sheet 3 and a water tube 4. The tube plates at both ends of the casing are provided with recirculation exhaust gas inlet and exhaust gas outlet, and the casing is provided with coolant inlet and coolant outlet. The cross-section of the heat exchange tube is a rectangle with different long sides and short sides. The upper and lower surfaces of the tube body ...

Embodiment 2

[0036] This embodiment is an improvement of Embodiment 1. The spacing of the short grooves in this embodiment is equal, and the axes of all the short grooves on the pipe body along the long side are connected together to form a continuous equal-pitch around the pipe body. spiral, such as figure 2 , 3 shown.

[0037] The equidistant helix is ​​similar to the helix on the existing continuous helical groove heat exchange tube, such as Figure 4 shown. Figure 4 Shown is a perspective view of a flat continuous spiral grooved heat exchange tube, which also has the effect of strengthening the flow of fluid inside and outside the tube, but compared with the flat grooved tube in the present invention, it lacks a tube body The bulge on the top is set, so that when it is arranged in the heat exchanger, there is no support between the tubes, and there may be a situation where the flat tube is deformed at high temperature, which may lead to a decrease in the heat exchange effect. The ...

Embodiment 3

[0040] This embodiment is an improvement of the second embodiment. In this embodiment, the helix angle of the axis of the short groove along the long side direction ranges from 15° to 30°.

[0041] In this embodiment, the helix angle 25 of the short grooves 23, 24 is between 15° and 30°. The depth of the short grooves 23, 24 is not less than 0.4 mm. For example, when the lengths of the long and short sides of the flat tube are 13.5 mm and 4 mm respectively, and the wall thickness is 0.3 mm, the depth of the short groove can be several different values ​​such as 0.6 mm, 0.8 mm, 1.0 mm, and 1.2 mm.

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Abstract

The invention discloses a flat groove heat exchange tube and a heat exchanger using the heat exchange tube. The heat exchanger is applied to an automobile engine waste gas recycling system as an engine waste gas recycling cooler and comprises a section-shaped stainless steel tube body with unequal height and width. The upper surfaces and lower surfaces of the tube body are provided with internally concave short grooves which are parallelly arranged and the upper surfaces and lower surfaces among a plurality of grooves are provided with bulges protruding externally. By the combination of the grooves and the bulges of the flat groove heat exchange tube, the heat exchange tube does not easily deform and generates stable heat exchange effect when bearing fierce temperature and pressure change. The short grooves for increasing the heat exchange efficiency can increase the strength of a plane in the long axis direction of the flat tube, inhibit deformation, and the mutual support of the bulges among the tubes forcefully improves the stress condition on the tube wall; thus leading to the minimum deformation of the flat tube, sparing an enough space among the tubes in spite of deformation and being beneficial to the flow of a medium outside the tubes.

Description

technical field [0001] The flat grooved heat exchange tube and the heat exchanger using the flat grooved heat exchange tube of the present invention are an accessory used for an automobile engine, and an exhaust gas recirculation cooling system used in an exhaust gas recirculation system of an automobile engine. The heat exchanger of the device. Background technique [0002] The application of heat exchanger has a long history, but it is still in continuous improvement and development. Heat exchangers account for 40% to 60% of all process equipment investment in petrochemical, machinery manufacturing, oil refining, metallurgy, light industry, pharmaceutical, food and other industries, so new heat exchangers continue to emerge with the advancement of science and technology . In the field of automobiles, coolers for engine exhaust gas recirculation cooling systems are also being continuously improved to meet increasingly stringent standards for automobile exhaust emissions. ...

Claims

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Application Information

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IPC IPC(8): F28F1/12F28F1/02F28D7/10F02M25/07F02M26/29F02M26/32
CPCY02T10/121Y02T10/12
Inventor 景建周沈董浩汤俊洁
Owner BEIJING U BRIDGE CHAOYANG
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