JPS6370097A - Heat exchanger - Google Patents

Abstract

PURPOSE:To improve heat exchange performance and provide freedom in shape and raise reliability by making heat exchange between a heating medium which flows in a pipe passage and the air which flows through pores in a porous metal and, after building a pipe passage, forming the porous metal tight contacting with the pipe passage. CONSTITUTION:A porous metal 5 which has continuous pores covers the external face of a pipe passage 4 with tight contact between them. When this is used for room heating the heating medium flowing through the pipe passage 4 and the air which flows in the external face of the porous metal 5 exchange heat between them to transfer heat from the heat medium to the air. At this time because the rate of porosity of the porous metal 5 which works as fin is made small, the air flow is disturbed and the heat conduction is improved and the heat exchange performance becomes better. Further, there is not necessity to connect the pipe passage 4 with welding but only bending of a single pipe is required with the possibility of providing a desired shape of heat exchanger. It is, therefore, possible to make a circular heat exchanger and it is possible to provide a shape of heat exchanger that fits the circular flow such as that from a propeller fan.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat exchanger used for air conditioning such as heating or cooling.

2. Description of the Related Art As shown in FIG. 3, a conventional heat exchanger of this type has a U-shaped metal tube 2 passed through a thin metal fin 1.
By expanding the pipe, the fiber 1 and the pipe 2 are firmly attached, and at the same time, the U-bend 3 is brazed to the end of the pipe 2,
It was configured so that the pipe line 4 was continuous. (For example, Japanese Unexamined Patent Publication No. 60-223995) Problems to be Solved by the Invention However, in the above configuration, when the number of stages is large, the number of brazing points increases, which reduces reliability and increases processing costs. I had this problem. On the other hand, the shape is limited to a rectangular shape, and it is difficult to process a circular shape or a shape in which the pipe has curvature, and there are also problems in that there is a limit to reducing the fin pitch.

The present invention solves such conventional problems, and aims to improve heat exchange performance, freedom of heat exchanger shape, and reliability.

Means for Solving the Problems In order to solve the above-mentioned problems, the heat exchanger of the present invention uses a pipe line obtained by bending a single pipe into an arbitrary shape without welding or other joints. The pipe has a structure in which a part or the whole of the pipe is covered with a porous metal having a series of pores, which is a member that is in close contact with the outer surface of the pipe.

Effects According to the present invention, heat exchange is performed between the heat medium flowing in the pipe and the air flowing in the pores of the porous metal due to the above-mentioned roof structure. At this time, by closely forming porous metal after forming the pipes, the shape of the pipes and the shape of the heat exchanger can be set arbitrarily.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In FIG. 1, reference numeral 4 indicates a meandering conduit with no connection part, and the outer surface of the conduit 4 is covered with a porous metal 5 having continuous pores in close contact with the conduit 4. It is being said.

In the above configuration, when used for heating, heat exchange is performed between the heat medium flowing inside the pipe 4 and the air flowing on the outer surface of the porous metal 5, and heat is transferred from the heat medium to the air. At this time, by reducing the porosity of the porous metal 5 that acts as a fin, it is possible to increase the fin area, and since air flows through the pores, the air flow is disturbed.
Heat transfer is also improved and heat exchange performance is improved. In addition, pipe line 4
There is also no need to weld connections, and a single tube can be bent to create any heat exchanger shape.

Next, another embodiment of the present invention will be described using FIG. 2. The point in FIG. 2 that is different from the above embodiment is that the conduit 4 has a spiral configuration, and with this configuration, a circular heat exchanger can also be easily created. This has the effect that it is possible to obtain a heat exchanger shape that is well suited to circular flow tubes such as propeller fans.

Effects of the Invention As described above, the heat exchanger of the present invention provides the following effects.

(1) Porous metal is used for the fins, so
In addition to being able to obtain a desired fin surface profile, it also has the effect of disturbing the flow of air flowing through the fins and improving heat exchange performance.

(2) Since the porous metal fins are closely covered after the pipes are formed, any pipe configuration and any heat exchanger shape can be obtained.

(3) Since the pipe structure does not include welded or other connections, a highly reliable heat exchanger can be obtained at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a heat exchanger in an embodiment of the present invention;
FIG. 2 is a perspective view of a heat exchanger according to another embodiment of the present invention, and FIG. 3 is a perspective view of a conventional heat exchanger. 4... Conduit, 5... Porous metal. Name of agent: Patent attorney Toshio Nakao and 1 other person 4-
Figure 1: No. 5 hard metal Figure 2

Claims (2)

[Claims] (1) A heat exchanger consisting of a pipe line obtained by bending a single pipe into an arbitrary shape, and a porous metal that covers at least a portion of the pipe line in close contact with the outer surface of the pipe line. . (2) The heat exchanger according to claim 1, wherein the conduit is formed in a spiral shape, and the porous metal covering the conduit is formed in a circular shape.