JPH0514118Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a connection device between a finned tube and a header in a solar heat collector or the like.

BACKGROUND ART Conventionally, as a connection device between a finned tube and a header in a solar heat collector, etc., as shown in FIG. 5, a plurality of finned tubes 12 arranged in parallel have been used.
It is known that each end of the header is joined to a pair of headers 13.

That is, as shown in FIG. 6, the finned tube 12 has the same length as the fin 14 at the center of the width of the lower surface of the band-shaped fin 14 made of aluminum and has excellent heat absorption performance, and extends in the longitudinal direction of the fin 14. stretches to,
Copper water pipe 15 with excellent corrosion resistance against hot water
are joined by high-frequency resistance welding or the like, and both ends are separated at the joint with the water pipe 15, and the water pipe 15 is removed at the location shown by the two-dot chain line in the figure. . Each head 13 is made of copper with excellent corrosion resistance against hot water, and as shown in FIG. An outwardly projecting flange 17 is provided into which the end of the flange 17 is fitted. As shown in FIG. 7, each end of the water pipe 15 of the finned pipe 12 is fitted into each flange 17 of the header 13 by a predetermined dimension, and the two are joined by brazing or welding. .

Problems to be Solved by the Invention The conventional connection device between the finned tube and the header has the following problems.

That is, considering versatility and cost, the finned tube 12 is a belt-like fin 1 of several meters to several tens of meters.
4 and a water pipe 15 of the same length, which is then cut to the desired length and used. In order to fit the tube 12 into the flange 17 of the header 13, both ends of the finned tube 12 must be cut off as described above. However, when both ends of the finned pipe 12 are separated at the joints with the water pipes 15, the flocculent portion 18 of the peripheral wall of the water pipe 15, which was the joint with the fins 14, is exposed as part of the fins 14. Since aluminum remains, when each end of the water pipe 15 is fitted into each flange 17 of both headers 13 made of copper and joined, the remaining aluminum on the peripheral wall of the water pipe 15 and the copper of the flange 17 become dissimilar metals. As a result, joint defects such as poor brazing and welding may occur, and problems such as flow and fluid leakage may occur at the joints.

As shown in FIG. 8, when fitting the water pipe 15 of the finned pipe 12 into the flange 27 of the header 23, in order to make the fitting depth constant, the middle part of the flange 27 is This also exists when the header 23 in which the diameter enlarged portion 27a is formed is joined to the finned tube 12.

The object of this invention is to provide a coupling device for a finned tube and a header that solves the above-mentioned problems.

Means for Solving the Problem This invention is based on a method in which a copper water pipe having the same length as the fin and extending in the longitudinal direction of the fin is joined to the bottom surface of an aluminum band-shaped fin, and both ends of the fin are connected to the water pipe. In a coupling device for connecting a plurality of finned pipes which are separated at the same time and are cut out leaving a water passage pipe, and a pair of copper headers having a plurality of holes drilled in the peripheral wall and an outwardly protruding flange provided on the periphery of the hole. In order to achieve the above objective, the outer diameter of each flange is made smaller than the inner diameter of each water pipe, and a flat surface is provided around the base end of each flange, and both ends of each water pipe are connected to both headers. The pipe is fitted onto the outer peripheral surface of each flange so as to come into contact with each flat surface portion of the pipe, and the water pipe and the flange are joined by brazing or welding.

Function The connecting device between the finned pipe and the header according to this invention has the outer diameter of each flange smaller than the inner diameter of each water pipe, and both ends of each water pipe are fitted over the outer peripheral surface of each flange. Since the water pipe and the flange are joined by brazing or welding, both ends of the fin are separated at the joint with the water pipe, and the water pipe is removed, leaving only the water pipe. Even if aluminum remains as part of the fin at the joint with the fin, this part will still be on the outside of the water pipe, and the parts to be brazed or welded will be made of similar metals. Become.

In addition, a flat surface is provided around the base end of each flange, and the ends of each water pipe are fitted onto the outer circumferential surface of each flange so that they come into contact with the flat surfaces of both headers. Positioning can be performed accurately.

Embodiments Hereinafter, embodiments of this invention will be described with reference to FIGS. 1 to 4.

In FIG. 1, reference numeral 1 denotes a connecting device between a finned tube and a header according to this invention, which is applied to a solar heat collector. This connecting device 1 is composed of five finned tubes 2 which are arranged in parallel and are substantially rectangular in plan, and a pair of cylindrical headers 3.

Each finned tube 2 has a copper cylindrical water pipe 5 which has the same length as the fins 4 and extends in the length direction of the fins 4 approximately at the center of the lower surface of the band-shaped fins 4 made of extruded aluminum material by high-frequency resistance welding. It is joined and both ends are separated at the joint with the water pipe 5 and cut into a rectangular shape leaving the water pipe 5 intact.

Each header 3 is made of copper, and has five circular holes 6 formed at predetermined intervals in its peripheral wall, and has an outwardly protruding shape on the periphery of each hole 6 having an outer diameter slightly smaller than the inner diameter of the water pipe 5. A flange 7 is provided. A flat surface portion 3 a is provided around the base end of the flange 7 on the peripheral wall of each header 3 .

The ends of each water pipe 5 in the finned pipe 2 are fitted over each flange 7 in both headers 3, and the two are joined by brazing.

Aluminum as part of the fin 4 remains in the linear portion 8 of the peripheral wall of the water pipe 5 that was the joint portion with the fin 4.

2 to 4 show the procedure for joining the water pipe 5 and the header 3. First, a circular hole 6 is made in each header 3, and a flange 7 is formed around the periphery of the hole 6 by burring, and a flat surface portion 3a is formed around the base end of the flange 7 by pressing ( Figure 2). Next, ring-shaped phosphor brazing solder (BCuP) 9 is placed on the flange 7 as a brazing material.
(Figure 3). Then, by fitting and brazing the end of the water pipe 5 of the finned tube 2 onto this flange 7, the two are joined at their opposing surfaces (FIG. 4).

Effects of the invention In the device for connecting the finned pipe and the header of this invention, both ends of the fins are separated at the joint with the water pipe, and the water pipe is removed, leaving only the water pipe. Even if aluminum remains as part of the fin at the joint with the fin, this part will still exist outside the water pipe, and the parts to be brazed or welded should be made of similar metals. Therefore, bonding defects such as brazing defects and welding defects do not occur, and there is no fear of cracking or fluid leakage at the joints caused by the bonding defects.

In addition, since positioning can be performed accurately during fitting and covering, the connection work can be performed efficiently, and there is no gap between the end face of the water pipe and the header.
It also has the advantage of good appearance.

[Brief explanation of drawings]

1 to 4 show an embodiment of this invention, in which FIG. 1 is a partially exploded perspective view of the coupling device, and FIG.
The figure is a partial perspective view of the header, FIG. 3 is a partial perspective view of the header with a brazing material fitted into the flange, and FIG. 4 is a partial plan view with a cutaway of the main part of the coupling device. 5 to 8 show conventional examples, FIG. 5 is a partially exploded perspective view of a coupling device, FIG. 6 is a partial perspective view of a finned tube, and FIG. 7 is a cutaway portion of one coupling device. The plan view, FIG. 8, is a cutaway partial plan view of another coupling device. 2...Tube with fins, 3...Header, 3a...
Flat surface part, 4...Fin, 5...Water pipe, 6...
Hole, 7...flange.

Claims (1)

[Scope of utility model registration request] Fin 4 on the bottom surface of the aluminum strip fin 4
A copper water pipe 5 having the same length and extending in the length direction of the fin 4 is joined, and both ends of the fin 4 are separated at the joint with the water pipe 5, and the water pipe 5 is removed. In a coupling device between a plurality of finned tubes 2 and a pair of copper headers 3 having a plurality of holes 6 in the peripheral wall and an outwardly protruding flange 7 provided on the periphery of the hole, the outer diameter of each flange 7 is The inner diameter of each water pipe 5 is smaller than that of each water pipe 5, and a flat surface part 3a is provided around the base end of each flange 7, so that each water pipe 5 has a flat surface part 3a around its base end so that both ends of each water pipe 5 come into contact with each flat surface part 3a of both headers 3. A connecting device for connecting a finned pipe and a header, which is fitted over the outer circumferential surface of a flange 7, and the water pipe 5 and the flange 7 are joined by brazing or welding.