JPS60181589A - Heat exchanger - Google Patents

Abstract

PURPOSE:To permit mass production with less number of process and improve the heat transfer performance of the heat exchanger by a method wherein both ends of heat transfer pipes are formed into hexagonal shapes and the central parts thereof are formed so as to have pleats while a multitude of the pipes are bundled up to form the heat exchanger so that each surfaces of the hexagonal shapes at both ends of the pipes are adhered to each other. CONSTITUTION:Both ends 2, 2' of the heat transfer pipes 1 are formed into hexagonal shapes and the central parts 3 thereof are formed so as to have pleats. A multitude of the heat transfer pipes are bundled so as to be adhered to each other at the surfaces of the hexagonal sections at both ends thereof while the outer periphery thereof is fixed by end plates 4 and frames 5. Gas A, whose heat is to be exchanged, flows through the inside of the heat transfer pipes while the gas B flows through the outside of the heat transfer pipes. Synthetic resin, easy to form, is used for the material of the heat transfer pipes and fine ceramics may be employed for the heat exchange of high-temperature gas while glass may be employed for gas having corrosive properties. The heat exchanger may be manufactured by only bundling the heat transfer pipes capable of being manufactured by mass production with less processes. Further, in case the moisture of the gas B is condensed, the condensed water is introduced into the valleys between the pleats, therefore, the heat transfer performance of the heat exchanger may be improved as compared with the heat transfer pipe of flat type.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a heat exchanger that performs heat exchange between two gases having different temperatures.

[Prior art and its problems]

In a heat exchanger that consists of a large number of heat exchanger tubes in a tube group, as a method of omitting the work of inserting the heat exchanger tubes into the tube sheet, a unit wall member such as a square, triangle, hexagon, etc. is fitted at both ends of the C heat exchanger tube, A heat exchanger constructed by bundling a large number of these is known (Japanese Patent Application Laid-Open No. 58-60196.
3392).

However, although these conventional examples are easy to assemble as a heat exchanger, the manufacturing of heat exchanger tubes requires fitting unit wall members at both ends, which increases the number of manufacturing steps and hinders cost reduction. .

[Purpose of the invention]

The object of the present invention is to provide a heat exchanger having a heat transfer tube structure that can be produced in large quantities with a small number of steps and that can improve heat transfer performance.

[Summary of the invention]

The present invention provides a heat exchanger constructed by bundling a large number of heat exchanger tubes formed into fully hexagonal shapes at both ends and pleated central portions so that the surfaces of the hexagonal portions at both ends are in close contact with each other. It is.

〔Effect of the invention〕

According to the present invention, the end portion of the heat exchanger tube t is formed into a hexagonal shape f'L, so that the step of fitting the unit wall member is not necessary. Furthermore, the central part of the heat exchanger tube has a pleated shape, which not only increases the heat transfer area, but also has the effect of improving heat transfer performance by imparting turbulence to the gas flowing inside the heat exchanger tube.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention. Both ends (2, 2') of the heat exchanger tube (1) are formed into a hexagonal shape, and the center part (3)
is formed into a pleated shape.

A large number of these heat exchanger tubes are bundled so that the surfaces of the hexagonal portions at both ends are in close contact with each other, and the outer periphery thereof is fixed by an end plate (4) and a frame (5).

Gas A to be heat exchanged flows inside the heat exchanger tube, and gas B flows outside the heat exchanger tube. As the material for the heat exchanger tube, in addition to synthetic resin that is easy to mold, fine ceramics may be used for heat exchange of high-temperature gases, or glass may be used for corrosive gases.

According to the present invention, a heat exchanger can be manufactured by simply bundling mass-produced heat exchanger tubes in a few steps. Furthermore, if the gas B to be heat exchanged is, for example, exhaust from a dryer and contains moisture, and the moisture is condensed by the low-temperature gas AK, the condensed water will be drawn into the valleys of the folds. Thermal resistance is lower than that of a smooth heat exchanger tube, and heat transfer performance is improved compared to a flat heat exchanger tube. It goes without saying that the heat transfer performance is improved by increasing the C heat transfer area due to the pleats and by the effect of providing turbulence to the gas within the heat transfer tube.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention. l...Heat transfer tube. 4... End plate. 5...Frame. Agent: Patent attorney Kensuke Chika (and 1 other person)

Claims (1)

[Claims] A heat exchanger made up of a large number of heat transfer tubes each having hexagonal ends and pleated central portions, which are bundled together so that the hexagonal surfaces at both ends are in close contact with each other.