JPS5833091A - Double pipe type heat exchanger - Google Patents

Abstract

PURPOSE:To improve the coefficient of heat transfer, to reduce the sectional area of heat transfer surface and to miniaturize the titled heat exchanger by a method wherein a single reticulated member or a layer of such members having a suitable thickness is inserted into an annular clearance between an inner pipe and an outer pipe of the heat exchanger. CONSTITUTION:A heat exchanger has a wire netting 4 (as the reticulated member) inserted into the annular clearance 3 formed between an inner pipe 2 and an outer pipe 1. In this case, the wire netting 4 may be inserted into the annular clearance 3 singly or in layers. Consequently, a fluid flowing through the annular clearance 3 in the direction of the arrow B meanders through the gaps among the wires of the wire netting 4 so that violent turbulences are generated in the fluid and the heat transfer coefficient of the fluid is imporved thereby. Further, due to the existence of the wire netting 4, the heat transfer coefficient of the inner pipe 2 is improved to a remarkable degree, the heat exchanger can be miniaturized and the heat transfer efficiency of the heat exchanger can be improved to thereby contribute effectively to the saving of energy and its resources.

Description

DETAILED DESCRIPTION OF THE INVENTION In order to utilize thermal energy effectively, it is necessary to skillfully use a heat exchanger that is optimal for each usage condition.

Therefore, the double tube heat exchanger that has been commonly used is the simplest type of heat exchanger, which is constructed by concentrically arranging two metal tubes with different diameters on the inside and outside. It is an exchanger that is easy to manufacture and maintain, the heat transfer area can be increased or decreased as needed, and high temperature fluid and low temperature fluid can flow completely countercurrently. widely used.

That is, in a general double-tube nonheat exchanger shown in the side cross-sectional view of FIG. The fluid which is a heat transfer medium shown by arrow A and the fluid which is a heat transfer medium shown by arrow B which flows through the annular part 3 formed between the inner tube material 2 and the outer tube material 1 move along the tube wall of the inner tube material 2. Heat is exchanged through the

However, in such a double-tube heat exchanger, no attempt has been made to use something like the baffle plate of a multi-tube heat exchanger in order to improve the heat transfer coefficient, and the flow rate of the fluid is simply increased. This method has the drawback that the heat transfer coefficient cannot be significantly improved because it is carried out only by increasing the heat transfer coefficient.

Therefore, the present invention has been made to solve the above-mentioned conventional drawbacks. By inserting a net-like body such as a wire mesh in one layer or in an appropriately overlapping manner, the fluid flowing through the annular part is made to flow through the gaps between the wires such as the wire mesh in the mesh-like body. By creating severe turbulence, the purpose is to improve the heat transfer coefficient, save heat transfer surface area, downsize the heat exchanger, and further improve heat transfer efficiency.

That is, in the present invention, two tubes having different diameters are arranged concentrically, and the fluid flowing in the inner tube and the fluid flowing in the annular portion formed between the outer and inner tubes are connected to the inner tube. In a double-tube heat exchanger that exchanges heat through a tube material, it is constructed by inserting a mesh body into the annular part.

The present invention will be described in detail below with reference to the drawings, and the side sectional view in FIG. 2 and the front sectional view in FIG. 3 show a double tube heat exchanger in an embodiment of the present invention. It has almost the same structure and function as the conventional example shown in FIG. The heat transfer medium fluid indicated by arrow B flowing through the section 3 exchanges heat through the tube wall of the inner tube member 2 .

Therefore, in the double tube heat exchanger in this example,
A wire mesh 4 is inserted as a net-like body into an annular portion 3 formed by an inner tube material 2 and an outer tube material 1.

By inserting the wire mesh 4 into the gap of the annular portion 3 in a single layer or in an appropriately overlapping manner, the arrow B flowing through the annular portion 6 can be
The fluid flows through the gaps between the wires of the wire mesh 4, thereby creating severe turbulence in the fluid indicated by the arrow B, thereby improving the heat transfer coefficient.

In addition, although the wire mesh 4 is used in the above embodiment,
It is not particularly limited to the wire mesh 4, and any mesh body may be used.

Therefore, in the double-tube heat exchanger of the present invention, the heat transfer coefficient of the outer surface of the inner tube material is significantly improved, making it possible to downsize the heat exchanger and improve heat transfer efficiency, resulting in energy and resource savings. It is valid.

In addition, it is a double-tube heat exchanger that simply uses a net-like material such as a wire mesh tightly wrapped around the inner tube material as the inner tube material, and it can be easily manufactured like a conventional double-tube heat exchanger. It has great industrial and economic effects.

In addition, the inner pipe material generally used in the present invention is:
It is not limited to smooth tubes, but heat transfer promoting tubes such as corrugated tubes can also be used as the inner tube material.
In that case, the heat transfer coefficient is further improved and the heat transfer effect is increased.

[Brief explanation of the drawing]

Figure 1 is a schematic side sectional view of a conventional double-tube heat exchanger;
The figure is a schematic sectional view of a double-tube heat exchanger according to an embodiment of the present invention, and FIG. 3 is a front sectional view of FIG. 2. DESCRIPTION OF SYMBOLS 1... Outer tube material, 2... Inner tube material, 6... Annular part, 4... Wire mesh, A, B... Fluid. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] Two pipes with different diameters are arranged concentrically, and the fluid flowing in the inner pipe and the fluid flowing in the annular part formed between the outer and inner pipes are connected to each other through the inner pipe. A double tube heat exchanger for exchanging heat, characterized in that a mesh body is inserted into the annular portion.