JPS6218866Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a heat exchanger having heat transfer fins on its outer peripheral surface.

The conventional heat exchanger is as shown in Figure 1 A and B.
A hollow cylindrical heat exchange element 1 is formed by extrusion molding, inner fins 2 are integrally formed during extrusion molding, and annular heat transfer fins 3 are formed on the outside of such heat exchange element 1. It was formed by pressure fitting.

For this reason, the shape, spacing, etc. of the inner fins 2 are restricted by extrusion molding, making it impossible to provide a product with good heat exchange efficiency.

This idea was made in order to eliminate such drawbacks of the conventional technology, and consists of two semi-cylindrical heat exchange elements formed into a predetermined shape with a large number of internal fins by extrusion molding and joined together facing each other. In the heat exchange body, a predetermined space is formed between the heat exchange elements to allow fluid to pass therethrough, and an annular heat transfer fin is attached to the outer peripheral surface of the cylindrical heat exchange element. , dovetail grooves and protrusions corresponding to the dovetail grooves are formed on the joining surfaces of the heat exchange elements to connect the heat exchange elements to each other with the dovetail grooves, and an annular transmission groove is formed on the outer peripheral surface of the cylindrical heat exchange element. The object of the present invention is to provide a heat exchange body in which heat exchange elements are fixed to each other by fitting heat fins.

Below, this invention will be explained in detail with reference to the illustrated embodiment. In FIG. The fins 2 are integrally formed during extrusion molding, and a cylindrical heat exchange element is formed by combining the inner fins 2, 2 so as to face each other and joining their both side end surfaces 1a to each other. . In addition, by forming protrusions corresponding to the grooves 5 and the dovetail grooves during extrusion molding on both end surfaces 1a, which are the bonding surfaces between the heat exchange elements 1 and 1, and by dovetailing the two, the heat exchange medium In addition to preventing leakage, it also improves the workability of joining. Then, the annular heat transfer fins 3 are press-fitted onto the outer circumferential surface of the cylindrical heat exchange element, and the heat exchange elements 1 and 1 are brought into close contact with the heat transfer fins 3, and they are welded or screwed together. The heat exchange elements 1, 1 can be bonded and fixed together without using the like. Reference numeral 4 denotes a circulation space formed between the heat exchange elements 1, 1, through which, for example, high-temperature combustion gas is passed, and heat is exchanged with the fluid passing outside the heat exchange elements 1, 1. be.

With the above configuration, the overall price of the heat exchanger can be significantly reduced, and the heat exchange efficiency can be increased.

That is, by forming a large number of heat exchange elements 1 of the same shape by extrusion molding, and joining two heat exchange elements facing each other, a cylindrical heat exchange element is obtained, and the shape is not hollow but solid. As a result, a complex fin shape is possible, and the shape and spacing of the inner fins 2 can be freely set, so the heat exchange area can be significantly increased, thereby improving heat exchange efficiency. can be done.

Figure 3 shows another embodiment of this invention.
A heat transfer fin 3 was fitted onto the outside of the combined cylindrical heat exchange elements 1, 1, and the inner peripheral edge of this heat transfer fin was fixed to the outer surface of the heat exchange element 1 by brazing. It is something. With this configuration, the brazing filler metal used for brazing will also flow between the end surfaces 1a, 1a on both sides of the heat exchange elements 1, 1, making the connection more reliable, and achieving a more airtight heat exchange. It can be used as a body, and the thermal conductivity can be improved compared to a simple fitting.

As an example of the above-mentioned brazing, when the heat exchange element 1 is made of aluminum, aluminum vacuum brazing can be used, but as shown in FIG. Then, the surface of the heat transfer fin 3 can be coated with the brazing material 6 in advance, and the heat transfer fin 3 is fitted into the heat exchange element 1, 1 as shown in FIG. When heated in a heating furnace, the brazing material 6 of the heat transfer fins 3 melts, and the heat transfer fins 3 can be reliably brazed to the heat exchange element 1 as shown in FIG. 4B.

As described above, this invention consists of two semi-cylindrical heat exchange elements formed into a predetermined shape with a large number of inner fins by extrusion molding, which are joined facing each other to form a cylindrical shape. In a heat exchange body formed by forming a predetermined space through which a fluid can pass, and attaching annular heat transfer fins to the outer peripheral surface of the cylindrical heat exchange element, a bonding surface between the heat exchange elements is formed. Heat exchange is achieved by forming dovetail grooves and protrusions corresponding to the dovetail grooves, connecting the heat exchange elements to each other with the dovetail grooves, and fitting annular heat transfer fins to the outer peripheral surface of the cylindrical heat exchange element. Since the elements are fixed to each other, a compact heat exchanger with high heat exchange efficiency can be manufactured at low cost, and the joining work can be performed without using welding, screwing, etc.

[Brief explanation of the drawing]

FIG. 1 shows a conventional heat exchanger, with A being a front view thereof and B being a side view thereof. FIG. 2 shows an embodiment of the heat exchanger of this invention, in which A is a front view thereof and B is a side view thereof. FIG. 3 shows another embodiment of the heat exchanger of this invention, in which A is a front view and B is a side view. FIG. 4 shows an example of a brazing method, in which A is a sectional view taken along the line -- in FIG. 3A before brazing, and B is a longitudinal sectional view of the same portion after brazing. In the figure, 1 is a heat exchange element, 2 is an inner fin, 3 is a heat transfer fin, 4 is a circulation space, 5 is a dovetail groove, and 6 is a brazing material. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) Two semi-cylindrical heat exchange elements formed into a predetermined shape with a large number of inner fins on the inside by extrusion molding are joined facing each other to form a cylindrical shape. In a heat exchange body formed by forming a predetermined space through which a fluid can pass between the exchange elements and attaching annular heat transfer fins to the outer peripheral surface of the cylindrical heat exchange element, the heat exchange elements are connected to each other. A dovetail groove and a protrusion corresponding to the dovetail groove are formed on the joining surface of the
A heat exchange element characterized in that the heat exchange elements are bonded together by dovetail grooves, and the heat exchange elements are fixed to each other by fitting annular heat transfer fins to the outer peripheral surface of the cylindrical heat exchange element. . (2) The heat exchanger according to claim 1 of the utility model registration claim, characterized in that the heat exchange elements are fixed to each other by brazing annular heat transfer fins to the outer peripheral surface of the heat exchange elements. body.