JPS5849895A - Heat exchanger - Google Patents

Abstract

PURPOSE:To improve the heat transmitting performance inside the tube of the heat exchanger by a method wherein the arrangement of strength members, which form coolant passages within the flat tube. CONSTITUTION:Subject heat exchanger is formed: Firstly, an intermediate member 13 is produced by forming strength members 11, which are laid out in such an arrangement as to promote heat transmission, and a positioner 12, which coagulates at an intermediate temperature of about 150 deg.C and serves to keep the fixed intervals between the members 11, into one integral body. Secondly, the intermediate member 13 is inserted into the flat tube 10, which has no partition walls at all. Thirdly, pressure is applied from the outside of the flat tube 10 so as to temporarily fix the strength members 11 and the flat tube 10. Fourthly, the positioner 12 is removed by washing with water or the like. Fifthly, after that, the strength members 11 and the flat tube 10 are put in a high temperature furnace in order to be jointed together with one another to complete the heat exchanger. Owing to the structure as described above, the coolant in the flat tube 10 freely flows normal to the direction of main flow and as well as the free selection of arrangement of the strength members becomes possible, resulting in enabling to realize a heat pipe with high performance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger comprising a flat tube in which a plurality of refrigerant flow paths are formed in parallel using a strength member in a meandering shape and corrugated fins are joined to mutually parallel portions.

Conventionally, this type of heat exchanger has a flat tube 1 bent into a meandering shape, corrugated fins 2 joined to parallel parts of the flat tube 1, and a refrigerant inlet pipe 3 connected to each other, as shown in FIG. The header 4 and the refrigerant outlet pipe 5! It consists of a rudder 6 to the IH exit. As shown in FIG. 2, the flat tube 1 has a plurality of refrigerant flow paths 8 arranged in parallel lines 1j inside the tube by a large number of strength members 7 provided so that the inside of the tube can withstand pressure.

Such serpentine flat tubes are usually formed by extrusion processing and censored processing in which the flat tube is bent into a serpentine shape, or hot processing in which flat plates are laminated and joined in a high-temperature furnace. Yop
Manufactured.

When a flat tube is manufactured by hot processing, there are many parts and many welding points, so rounding precision gold g is required to ensure the reliability of the joint surface, and the equipment cost is high. Most of these problems are solved by cold working. However, in the case of cold working, the large number of spaces that serve as refrigerant flow paths separated in consideration of pressure resistance must be independent and good, and firstly, the fluid flowing through each space must flow into adjacent spaces. There isn't.

For this reason, taking an evaporator as an example, if the flow distribution at the header is extremely poor, in a space where the refrigerant flow rate is low, it will completely evaporate on the way to the outlet header, and liquid refrigerant will not be replenished from the adjacent space. , there is almost no heat exchange in this part, resulting in a decrease in heat transfer performance.

(9) In order to completely improve the heat transfer performance of this type of heat exchanger, it is necessary to devise the shape of the corrugated fins 2 as well as the shape of the inside of the flat tube 1. However, in the above-mentioned extrusion process, the shape of the inside of the tube cannot be freely selected because it is difficult to process.In other words, in cold working, it is difficult to create a shape that can promote heat transfer inside the tube at a low cost. Yes.

The present invention addresses the above points and aims to provide a heat exchanger with improved intra-tube heat transfer performance by devising the shape of the reinforcing member forming the intra-pipe refrigerant passage of the flat tube.

The present invention consists of a strength member formed in a shape that can promote heat transfer inside a flat tube without partition walls, and a ninth core (150cm* solidified at medium temperature) that maintains a constant distance between the strength members. After inserting the intermediate member that is integrated with the flat tube, pressure is applied from the outside of the flat tube, the strength member and the flat tube are temporarily attached, the core is removed by washing with water, etc. It is characterized by being formed by joining flat tubes.

The method for manufacturing flat tubes in the heat exchanger of the present invention will be described below for 1 s.
This will be explained with reference to FIGS. 3 to 7.

First, as shown in FIG. 3, a flat tube 1G without partition walls is formed, and as shown in FIGS. 4 and 5, strength members 111 are formed to be inserted into the flat tube 10 at regular intervals. A plurality of strength members 11 are used and inserted at equal intervals. The strength members 11 are partitioned at equal intervals and formed in advance by press working into a looper shape in the example shown in FIG. 4, and a comb shape in the example shown in FIG. do. In addition, the end face f of the strength member 110 after molding
Apply wax to ill and llb. Next, in order to make the interval between adjacent strength members 10 constant and to prevent deformation when inserted into a flat tube, as shown in FIG. Using the solidifying core 12, an intermediate member 131 consisting of the strength member 11 and the core 12 is made. Note that the material of the core 12 must be water-soluble. Moreover, the thickness of Nakakosato 2 is approximately 172 to 3/41 of the height of the strength member 11! Adjust to the desired degree.

The intermediate member 13 manufactured by the method described above is inserted into the flat tube 10 as shown in FIG. In this state, the upper surface 101 of the flat tube 10. Pressure is applied from the lower surface 10b to flatten the tube 10.
and temporarily attach the strength member 11. Next, water is poured into the space created between the inside of the flat tube 10 and the intermediate member 13 to dissolve the core 12, and the core 12 is gradually removed. After the core 12 has been sufficiently removed, the inside of the pipe is drained with water.

Next, in a high temperature furnace, 111% of the upper surface of the above-mentioned strength member 11 is heated.
By melting the brazing material on the lower surface flb, you can create a flat tube! 0 and the strength member 11 are fixed. As a result, the flat tube forms a strength member within the tube that slows down the flow paths adjacent to each other.

As explained above, according to the present invention, the flow of refrigerant in the flat tube is made to flow freely in the direction perpendicular to the flow, and the shape of the strength member can be freely selected, resulting in a high-performance heat exchanger tube. It becomes possible to do so.

[Brief explanation of drawings]

Figure 1 is a diagram explaining an example of a conventional full-gate fin heat exchanger, Figure 2 is a cross-sectional view of the flat tube in Figure 1, and Figure 3 is a cross-sectional view of the flat tube in Figure 1.
Figures 2 to 7 are diagrams illustrating the method for manufacturing flat tubes in the heat exchanger of the present invention. lO: Flat tube, 11: Strength member, 12: Core, 13: Intermediate member. Figure 1 Figure Z ■ 3 Figure YJ4 Figure

Claims (1)

[Claims] 1. In a heat exchanger made of flat tubes with internal K(l) parallel refrigerant channels formed in a meandering shape and corrugated fins T-joined to mutually parallel parts,
The flat tube has a shape in which adjacent refrigerant flow paths are connected to each other after arranging an intermediate member consisting of an O1]11 member and a water-soluble core, temporarily attaching a strength member to the inner wall of the tube, and removing the core. , A heat exchanger characterized in that it is constructed by welding an inner wall of a pipe and a strength member.