JPS6176890A - Heat exchanger - Google Patents

Abstract

PURPOSE:To make it possible to prevent an air flow from leaking and to make repair of root portions by providing plates extending between sheet metals and fins in the direction which is substantially rectangular to the core part ventilation direction and filling up gaps formed between the sheet metals and fins. CONSTITUTION:A corrugated fin type heat exchanger has two hot water tanks 2 and 14, sheet metals 8 and 80 which cover the hot water tanks, and core parts. The core parts are formed by a large number of tubes 10 both ends of each of which are inserted into and connected to both hot water tanks 2 and 14 an fins 12 mounted on these tubes 10. A thin and long plate 10 such as a bent portion 16 which extends in the direction substantially rectangular to the ventilating direction 4 of the core part and fills up gaps between the sheet metals 8 and 80 and the fin 12, is provided between the sheet metal 8 and the fin 12. Since the tip end of the bent portion 16 makes contact with the end portion 12a of the fin 12, it is possible to prevent the air flow from leaking and further when the leak is generated from the root portion, soldering of a part D is carried out from the direction C by a line solder and thus the repair of the root portion is made possible.

Description

Detailed Description of the Invention A. Field of Industrial Application The present invention relates to a type of heat exchanger that combines corrugated fins and tubes, and is particularly applicable to hot water heating systems for automobiles or automobile engines. It is effective for use in so-called compact heat exchangers such as radiators.

Conventional technology For example, a conventional corrugated fin type heat exchanger as disclosed in Japanese Utility Model Publication No. 53-33885 has already been assembled when soldering (hereinafter referred to as rooting) the joint between the sheet metal and the tube. , A certain gap is maintained between the sheet metal and the fins in order to prevent solder from being absorbed by the fins that have already been soldered.

Therefore, when heating air passes through the core, it does not pass through the fins 1211, as shown by arrow E in FIG. 9, and therefore passes through the gap between the sheet metal 8 and the fins 12 without exchanging heat. This will cause a decrease in heating capacity. According to experiments, the influence of the gap between the sheet metal and the fins on the heating capacity is as shown in Figure 10, and even at present it is approximately 2.
The capacity has decreased by about %.

Furthermore, since the fin ends are free ends and the lengths of the fins vary, it is not always possible to determine a reliable dimension for the height of the core formed by the fins.

In order to prevent metal leakage from the gap between the sheet metal and the fin, it is recommended to attach a gasket to the gap between the sheet metal and the fin.
It has been proposed to fill the gap by pouring liquid urethane foam between the fins and the sheet metal as disclosed in No. 6>. Although these methods can prevent leakage, they do not solve the problem of reliability of the dimensions of the core height formed by the fins, and furthermore, the netsuke is difficult to prevent when leakage occurs. Extrapolation becomes difficult.

It is an object of the present invention to provide a heat exchanger that prevents drafts between the sheet metal and the fins and also allows repair of the base portion.

Another object of the present invention is to provide a heat exchanger in which the height of the core formed by the fins can be determined with high reliability.

20 Structure of the Invention To achieve this object, the present invention comprises two hot water tanks, a sheet metal covering the hot water tanks, and a number of tubes J3 and tubes inserted at both ends into the sheet metal and connected to the hot water tanks. In a corrugated fin type heat exchanger having a core section consisting of attached fins, between the sheet metal and the fins, the sheet metal and the fins extend in a direction substantially perpendicular to the direction in which the core section passes. It has a long and narrow plate that fills the gap between the two.

E, Example The present invention will be described in detail below based on the drawings.

FIG. 1 is a sectional side view of a main part of an embodiment of a heat exchanger according to the present invention, and FIG. 2 is a perspective view of an example of a heat exchanger to which the present invention is applied.

In the figure, a hot water inlet lever 4 is connected to the inlet tank portion 2a of the upper hot water tank 2, and a hot water outlet lever 6 is connected to the outlet tank portion 2b.

A fin 12 is attached to a tube 10 whose one end is inserted into a sheet metal 8 covering the upper hot water tank 2 and connected to the upper hot water tank 2. The other end of the tube 10 is inserted into a seamy metal 80 that covers the lower hot water tank 14 and is connected to the lower hot water tank 14 .

The square tube 10 and the fins 12 constitute a core portion.

The sheet metal 8.80 is provided with a bent portion 16 extending approximately at right angles to the core ventilation direction (in the direction of the arrow) at approximately the center of the length of the core portion. Although the bent portion 16 is illustrated, it may be of any type as long as its tip is in contact with the end portion 12a of the fin 12.

The material of the sheet metal 8.80 is, for example, aluminum, the material of the tube 10 is, for example, brass or aluminum, and the material of the fin 12 is, for example, copper or aluminum.

The heating air flows in the direction of the arrow by a fan (not shown), and exchanges heat with the hot water in the tube 10 while passing between the fins 12 and the tube 10. As shown by arrow B, hot water flows through the hot water inlet pipe 4, the inlet tank part 2a of the upper hot water tank 2, the left tube group, the lower hot water tank 14, the right tube group, the hot water tank part 2b, and the hot water outlet pipe 6. .

Next, the assembly process of the core part will be explained.

First, the fins 12 and tube 10 are stacked and tightened using a jig, and in this state, the sheet metals 8 and 80 are assembled. Thereafter, with the jig attached, flux is applied and integrally brazed in a furnace to join the fins 12 and tube 10. Next, solder the root part, and
0 and sheet metal 8.80 are joined. After that, solder the hot water tank, clean the vibrator, complete the core assembly, and finally check for leaks.Tube 10 Root A 4 part Then, flat soldering is performed on the D part shown in Fig. 1 from the direction C using wire soldering, and the netsuke is repaired.

As mentioned above as a conventional technique, when applying a gasket to the gap between the sheet metal and the fin or pouring liquid urethane foam into this gap, it is not possible to solder from the C direction, so repair of the root part is difficult. However, in the present invention, since soldering can be performed from the C direction, repair of the root part has become possible.

In this example, sheet metal 8.8
0 is provided with a bent portion 16 extending in a direction substantially perpendicular to the core ventilation direction, and the tip of this bent portion 16 is connected to the fin 1.
2, it is possible to prevent wind leakage as shown by the arrow E in FIG. A highly reliable dimension for the height of the core to be formed can be obtained.

Furthermore, in this embodiment, since wind leakage is prevented by the bent portion 16 of the sheet metal 8.80, wind leakage can be prevented without increasing the number of parts.

FIG. 3 is a perspective view of another embodiment of the heat exchanger according to the present invention;
FIG. 4 is a sectional side view of the main part of the embodiment shown in FIG. 3.

In this embodiment, the present invention is applied to a type of heat exchanger in which the internal space of one of two hot water tanks is divided into two, as disclosed in Japanese Utility Model Application Publication No. 54-28160. This is an example.

This embodiment differs from the embodiment shown in FIGS. 1 and 2 in that the internal space of the upper hot water tank 2 is divided into two in the front and back direction of the core ventilation direction, and the sheet metal 8,
The only difference is that the bent portion 160 of 80 is fitted into the divided portion 18 of the hot water tank 2 divided into two and soldered, and the other configuration is the same as the embodiment shown in FIGS. 1 and 2. It is.

In this type of heat exchanger, the hot water tank 2 is divided into two parts.
Since the divided portion 18 is sealed with a packing, the sealing performance is not perfect and durability is also a problem, which causes internal leakage and causes a decrease in the performance of the heat exchanger. In this embodiment, since the structure is as described above, the sealing performance of the divided portion 18 is perfect C1 and the sealing portion is excellent in durability, so that the conventional packing is unnecessary.

FIG. 5 is a cross-sectional front view of the pig part of still another practical example of the heat exchanger according to the present invention, and FIGS. 6 to 8 are cross-sectional side views of main parts of the embodiment combined with FIG. 5.

In the embodiments shown in FIGS. 1 and 2, the sheet metals 8 and 80 are provided with a bent portion 16, and this bent portion 16 is a plate as described in claim 1. , in this example fin 12 and sheet metal 8.80
It differs in that plates 20, 120, 220 configured separately from the sheet metal 8.80 are provided between them,
The other configurations are the same.

The cross-sectional shape of the plate 20, 120° 220 in this embodiment may be, for example, a mouth shape, a T shape, or a square shape as shown in the figure.
It can be shaped like a letter, but it is not limited to this, and one end is in contact with the sheet metal 8.80, and the other end is in contact with the fin 10.
Any shape may be used as long as it comes into contact with the .

In this example, to incorporate the plates 20° 120.220 into the heat exchanger, after the fins 12 and tubes 10 have been assembled, the sheet metal 8.
When assembling 80, it is only necessary to place it between the tubes 10, so it can be easily carried out.

1 Effect of the Invention The heat exchanger according to the present invention is provided with an elongated plate that fills the gap between the sheet metal and the fins, so that the sheet metal and the fins can be prevented from getting wet. Repairs can be made to the parts.

Further, in the heat exchanger according to the present invention, since the fins can be positioned using the elongated plate, a highly reliable dimension can be obtained for the height of the core formed by the fin portion.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of essential parts of an embodiment of a heat exchanger according to the present invention, FIG. 2 is a perspective view of an example of a heat exchanger suitable for applying the present invention, and FIG. 3 is a heat exchanger according to the present invention. FIG. 4 is a perspective view of another embodiment of the exchanger, FIG. 4 is a cross-sectional side view of the main part of the embodiment shown in FIG. 3, and FIG. 5 is a main part of another embodiment of the heat exchanger according to the present invention. 6 to 8 are cross-sectional side views of main parts of the embodiment shown in Fig. 5, and Fig. 9 is a cross-section of main parts for explaining wind leakage of the heat exchanger in the conventional example. The side view, FIG. 10, is a diagram showing the relationship between the gap between the sheet metal and the fins and the heat radiation performance of the heat exchanger. 2...Upper hot water tank, 8.80...Sheet metal, 10...Tube, 12...Fin, 12a...Fin End part, 14... Lower hot water tank, 16.160... Bent part, 18... Divided part, 20.120.220... Plate, A...
... Core ventilation direction.

Claims (5)

[Claims] (1) A core consisting of two hot water tanks, a sheet metal covering the hot water tanks, a number of tubes whose ends are inserted into the sheet metal and connected to the hot water tanks, and fins attached to the tubes. In a corrugated fin type heat exchanger having a section, an elongated plate is provided between the sheet metal and the fins, extending in a direction substantially perpendicular to the core ventilation direction and filling the gap between the sheet metal and the fins. characterized by
Heat exchanger. (2) In the heat exchanger according to claim 1, the elongated plate is formed by a bent portion of the sheet metal, and the top of the bent portion is in contact with the fin. A heat exchanger. (3) In the heat exchanger according to claim 2, the internal space of any one of the two hot water tanks is divided into two in the front and back direction of the core ventilation direction, and the bent part A heat exchanger that fits into a divided part of a hot water tank divided into two parts. (4) The heat exchanger according to claim 1, wherein one side of the elongated plate is in contact with the fin and the other side is in contact with the sheet metal. vessel. (5) In the heat exchanger according to any one of claims 1, 2, or 4, the elongated plate is located approximately at the center of the core portion in the ventilation direction. A heat exchanger characterized by being installed in the section.