JPH038560A - Fin tube type heat exchanger - Google Patents

Abstract

PURPOSE:To secure joining quality without any leakage by constituting the inner part with plural lines of heat conducting tubes in which cooling medium flows and circuit of connecting tubes for connecting these and making inclined deep drawing shape having the same angle of both of brazing joining parts in the heat conducting tube and the connecting tube. CONSTITUTION:In the inner part of the heat conducting tube 11, the cooling medium flows and the connecting tube 12 forms circuit of this heat conducting tubes. Step pitch D11 of the heat conducting tube is the same as the pitch of connecting tube. Clearance D12 is the clearance for brazing at the time of inserting the connecting tube into the heat conducting tube. Enlarged pipe shape at the tip part of the heat conducting tube and the tapered angle T0 in the tip shape of insert part of the connecting tube are made to the inclined deep drawing works having the same angle. Even if dispersions of step pitch D11 and bending pitch of the connecting tube 12 are made to large, the clearance D12 for suitable brazing can be held. By this method, and joining quality of brazing without any leakage can be secured.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a fin-tube heat exchanger used in cooling systems such as air conditioners and refrigerators, which transfers heat between a refrigerant and a fluid such as air. be.

Conventional technology In recent years, in the piping circuit of a fin-tube heat exchanger, an incompatibility between the joints of the heat transfer tubes and the connecting tubes has caused leakage from that area, leading to quality deterioration in the market, and there has been an urgent need to improve this problem. ing.

An example of a conventional fin-tube heat exchanger will be described below with reference to the drawings. Figure 3.

FIG. 4 shows a brazed joint between a heat transfer tube and a connecting tube in a conventional piping circuit. 1 in Fig. 3 is a heat transfer tube in which a refrigerant flows;
2 is a connecting tube that forms the circuit of the heat exchanger tube 1, and Dll is a step pitch that is the same as the pitch of the connecting tube 2. FIG. 4 is an exploded cross-sectional view taken along the line AA' in FIG. 3. In Figure 4, DI2
is the brazing clearance when the connecting tube 2 is inserted into the heat exchanger tube 1, and the tip shape of the insertion portion of the connecting tube 2 and the expanded tip shape of the heat exchanger tube 1 receiving the connecting tube were both straight shapes.

Problems to be Solved by the Invention However, in the above configuration, there are variations in the 10-stage pitch D11 of the heat exchanger tubes and variations in the tip pitch of the connecting tube 2 after bending, and the clearance DI2 is large υ, and it is difficult to braze without leakage. The problem was that the bonding quality deteriorated significantly.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a fin-tube heat exchanger that solves the above-mentioned problems, secures an appropriate brazing clearance, and has a high quality spout-to-joint connection.

Means for Solving the Problems The fin-tube heat exchanger of the present invention consists of a circuit of multiple rows of heat transfer tubes through which a refrigerant flows and connection tubes connected to the heat transfer tubes. Both joints have a tapered shape with a single angle.

Effect: In the above configuration, it is possible to maintain an appropriate brazing clearance of the tip shape of the brazing joint portion between the heat transfer tube and the connecting tube. Therefore, leak-free brazing joint quality can be ensured.

Embodiment As an embodiment of the present invention, a brazed joint between a heat exchanger tube and a connecting tube in a piping circuit is shown in FIGS. 1 and 2.

In FIG. 1, 11 is a heat transfer tube through which a refrigerant flows, 12 is a connecting tube forming a circuit of the heat transfer tubes 110, and Dll is a step pitch that is the same as the pitch of the connecting tubes 12. FIG. 2 is an exploded cross-sectional view taken along line E-B/ in FIG. 1. In Figure 2, DI2
is the brazing clearance when the connecting tube 12 is inserted into the heat exchanger tube 11, and the taper angle T0 of the expanded shape of the tip of the heat exchanger tube 11 and the shape of the inserted tip of the connecting tube 12 are the same angle as the taper drawing process. did.

Next, the operation of the configuration of this embodiment will be explained.

By tapering the expanded shape of the tip of the heat transfer tube 11 and the tip shape of the insertion part of the connecting tube 12 at the same angle, the step pitch D is reduced.
Even if the variation in the bending pitch of the connecting pipe 11 and the connecting pipe 12 becomes large, an appropriate brazing clearance DI2 can be maintained, and brazing joint quality without breakage can be ensured.

Effects of the Invention As described above, the fin-tube heat exchanger of the present invention consists of a circuit of multiple rows of heat transfer tubes through which a refrigerant flows, and connection tubes connected to the heat transfer tubes, and the circuit between the heat transfer tubes and the connection tubes. Since both brazed joint parts are drawn into a tapered shape with a single angle, an appropriate brazing clearance can be maintained, and leak-free brazing joint quality can be ensured.

[Brief explanation of the drawing]

Figure 1 shows a fin tube type heat exchanger 2 according to an embodiment of the present invention.
Fig. 2 is an analytical cross-sectional view taken along the line BB' in Fig. 1. Fig. 3 is an external perspective view of a conventional fin-tube heat exchanger. It is an A' line exploded sectional view. 11...Heat transfer tube, 12...Connection pipe, D
ll...mark/step hitch, D12...clearance, To...taper angle.

Claims (1)

[Claims] It consists of a circuit of multiple rows of heat transfer tubes through which refrigerant flows, and connection tubes connected to the heat transfer tubes, and the brazed joints between the heat transfer tubes and the connection tubes are both drawn into a tapered shape at a single angle. Fin tube type heat exchanger.