JP2002361346A - Manufacturing method for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance assemblability of a heat exchanger. SOLUTION: A plurality of collar parts 2a and collar parts 2b are provided in the longitudinal direction, the heat exchanger is constituted of a plurality of fins 2 lined with them, a heat transfer tube 1 provided with a plurality of meandering parts in the vertical direction, and side plates 4 disposed on both sides of the fins, and the heat transfer tube 1 is inserted into the collar parts 2a, 2b, 4a and 4b of the fin 2 and the side plates 4 from one direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a heat exchanger, and more particularly, to a structure for assembling a heat exchanger without requiring welding of a U-shaped tube to a heat transfer tube.

[0002]

2. Description of the Related Art As shown in FIG. 3A, a conventional heat exchanger used for an air conditioner or the like is provided with a plurality of tubular members 30 formed in a hairpin shape, and the tubular members 30 are inserted. A plurality of fins 31 made of an aluminum material provided with a plurality of collars 32a, side plates 32 made of sheet metal provided on both sides of the fins 31, and a U-shaped tube 33 joined by welding to an opening of the tubular member 30 It is composed of In the assembling procedure, first, the side plates 32 are arranged on both sides, a plurality of the fins 31 are arranged in parallel, and the tubular member 30 is inserted through the collar portion 32a. Subsequently, spherical bodies 34 called tube expansion mandrels are press-fitted from respective connection ports of the tubular member 30, and as shown in FIG. 3 (B), the diameter of the tubular member 30 is increased and the tube member 30 is pressed against the collar portion 32a. The fins 32 are fixed. The fin 32 is provided with the collar 32a.
Thus, predetermined intervals are maintained respectively. Next, the U-shaped pipe 33 is welded to each connection port so that the tubular member 30 communicates in a meandering manner.

[0003] However, the work of welding the U-shaped pipe 33 to the respective connection ports of the tubular member 30 requires a large amount of labor due to the large number of work locations, and high-pressure refrigerant is discharged from the weld location due to poor welding. There is a risk of leakage and a heat exchanger that does not require welding work has been desired.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a method for manufacturing a heat exchanger which can eliminate the leakage of refrigerant due to poor welding and can be easily assembled.

[0005]

In order to solve the above-mentioned problems, the present invention comprises a plurality of collar portions in the longitudinal direction, a plurality of fins arranged in parallel, a pair of connection ports on the same side, and a meandering portion. A heat exchanger is composed of a plurality of heat transfer tubes formed in the vertical direction, and a side plate disposed on both sides of the fin and having a plurality of insertion holes in a longitudinal direction, the heat exchanger comprising: an insertion hole of the side plate and the collar portion of the fin. And the heat transfer tube is inserted, one of the connection ports is closed with a plug, a diameter expansion device is connected to the other connection port, the heat transfer tube is expanded by the diameter expansion device, and the side plate is It is configured to be pressure-bonded to the insertion hole and the collar portion of the fin.

[0006] The diameter expanding device includes a connecting pipe connected to the connecting port, and a hydraulic section for storing a liquid and applying pressure to the connecting pipe to send the liquid to the connecting pipe. The configuration is such that the diameter of the heat transfer tube is expanded by sending a liquid to the heat transfer tube through the connecting tube and applying pressure.

Further, the liquid is configured to be ethylene glycol.

[0008]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an external perspective view showing a heat exchanger assembled by the manufacturing method according to the present invention, and FIG. 2 (A) is an exploded perspective view thereof. FIG. 2B is a perspective view showing a state where the heat exchanger and the diameter expanding device are connected. As shown in FIG. 1, the heat exchanger assembled by the manufacturing method according to the present invention includes a fin 2 in which thin flat plates made of an aluminum material are juxtaposed at predetermined intervals, and a sheet metal provided on both sides of the fin 2. And a heat transfer tube 1 arranged in a meandering direction perpendicular to the side plate 4 and the fins 2. Connection ports at both ends of the heat transfer tube 1 are connected to other devices. It is welded to the connecting pipe 5 and the connecting pipe 6, respectively.

As shown in FIG. 2A, the heat transfer tube 1 is formed by bending both ends of a tubular member made of a copper material into an arc shape by a bend portion 1c, respectively, thereby forming both ends of a tube path 1a and a tube 1b. Are formed in a meandering shape connected by the bend portion 1c, and have connection ports 1d and 1e on the same side. The fin 2
Is provided with a collar portion 2b when the collar portion 2a and the stub passages 1a and 1b connected to the bend portion 1c are inserted, and the side plate 4 made of sheet metal is also provided with the fins 2a.
And has an insertion hole 4a and an insertion hole 4b.

Next, the procedure for assembling the above heat exchanger will be described. First, a number of the fins 2 are arranged in parallel, and the side plates 4 are arranged on both sides thereof. Next, the bend portions 1c of the heat transfer tubes 1 and the tube passages 1a and 1b connected to the bend portions 1c are connected to the insertion holes 4a and 4b of the side plate 4 and the collar portions 2a of the fins 2. 2e, and the bend portion 1c and the connection port 1
d and 1e are projected from both sides of the side plate 4.

Next, as shown in FIG. 2B, the connection port 1e is closed by a stopper 10 while the connection port 1d is closed.
Then, the connection pipe 8a of the diameter expanding device 8 is connected. Diameter expansion device 8
Is provided with a tank in which ethylene glycol is stored, and high-pressure ethylene glycol can be sent out through the connection pipe 8a by a hydraulic part connected to the tank. When the connection pipe 8a is connected to the connection port 1d, high-pressure ethylene glycol is fed into the heat transfer pipe 1, whereby the heat transfer pipe 1 is expanded and the side plate 4a is expanded.
The heat transfer tube 1 is fixed to the side plate 4 and the fin 2 by being pressed against the collar portions 2a, 2b, 4a and 4b of the fin 2.

Next, the plug 10 and the connection pipe 8a are detached from the connection ports 1d and 1e, and the pipe 6 is welded to the connection port 1d and the pipe 5 is welded to the connection port 1e, respectively.
Thereby, the heat exchanger can be easily assembled without requiring the welding operation at the bend portion 1c, and it is not necessary to consider leakage of the refrigerant due to poor welding.

[0013]

As described above, according to the present invention,
A heat exchanger formed of a heat transfer tube in which a tubular member is bent in a meandering shape, a plurality of collar portions vertically formed, a plurality of fins arranged side by side, and side plates arranged on both sides of the fins, By expanding the heat transfer tube with a diameter expanding device and pressing the heat transfer tube against the collar portion of the fin, a method of manufacturing a heat exchanger with reduced assembly man-hours can be provided.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a heat exchanger assembled by a manufacturing method according to the present invention.

FIG. 2A is an exploded perspective view showing a heat exchanger.
(B) is an external appearance perspective view which shows the state which connected the diameter expansion apparatus to the heat exchanger.

FIG. 3A is an external perspective view showing a conventional heat exchanger. (B) is a cross-sectional view showing the diameter expansion of the heat transfer tube.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat transfer tube 1a tube 1b tube 1c bend 1d connection 1e connection 2 fin 2a collar 2b collar 4 side plate 4a insertion hole 4b insertion hole 5 pipe 6 pipe 7 welding part 8 expanding device 8a connection pipe 10 plug

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F28F 1/32 F28F 1/32 F

Claims (3)

[Claims] 1. A heat transfer tube provided with a plurality of collar portions in a longitudinal direction, a plurality of fins arranged side by side, a pair of connection ports on the same side, and a plurality of meandering portions formed in a vertical direction, and both sides of the fins The heat exchanger is constituted by a side plate provided with a plurality of insertion holes in the longitudinal direction, and the heat transfer tube is inserted through the insertion hole of the side plate and the collar portion of the fin. One end is closed by a stopper, a diameter expansion device is connected to the other connection port, the heat transfer tube is expanded by the diameter expansion device, and the heat transfer tube is pressed against the insertion hole of the side plate and the collar portion of the fin. A method for manufacturing a heat exchanger, comprising: 2. The diameter expansion device according to claim 1, further comprising: a connection pipe connected to the connection port; and a hydraulic section for storing a liquid, applying a pressure, and sending the liquid to the connection pipe. The method for manufacturing a heat exchanger according to claim 1, wherein the heat transfer tube is expanded by sending a liquid to the heat transfer tube through a connecting tube and applying pressure. 3. The method according to claim 1, wherein the liquid is ethylene glycol.