JPS6150240B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Generally speaking, the present invention relates to a structure for facilitating air removal from an upper tank of a heat exchanger, and its use is not particularly limited.
It is suitable for use in a radiator for heat dissipation of internal combustion engine coolant in automobiles.

In recent years, in order to improve fuel efficiency in automobiles, there has been a demand for lighter parts in the vehicle, and ways to reduce the weight of radiators include not only reducing the number of constituent materials, but also reducing the capacity of the coolant. This is an effective means of weight reduction. In order to reduce this coolant capacity, it is necessary to make the tank smaller. By the way, the upper tank of the radiator has an inlet pipe for circulating the coolant through a liquid injection port for injecting the coolant. As the inner diameter of this inlet pipe becomes smaller, water flow resistance increases and the circulation flow rate of the radiator decreases, so there is a limit to how small the inner diameter of the inlet pipe can be made. Therefore, if the inlet pipe remains the same size and only the upper tank is made smaller, the top of the tank 5 will be lower than the top of the inner surface of the inlet pipe 5a, as shown in Figures 1 and 2. As a result, the air flowing into the upper tank 5 together with the cooling liquid from the inlet pipe 5a cannot be separated and discharged to the liquid injection port 5b side, and therefore the air flows into the tube 1 together with the cooling liquid. This causes various problems such as a decrease in heat dissipation efficiency.

The present invention has been made in view of the above points, and includes providing an air vent protrusion in the upper tank that extends from the liquid injection port to the inlet pipe and has a height that is approximately equal to or higher than the top of the inner surface of the inlet pipe, By communicating the side part of the liquid inlet and the top of the inner surface of the inlet pipe through the space inside this protrusion, it is possible to make the upper tank smaller and to have a good air venting effect in the upper tank. The purpose is to provide an exchanger.

The present invention will be described below with reference to embodiments shown in the drawings. Figures 3 to 6 show an embodiment in which the present invention is applied to a radiator for heat dissipation of coolant in an automobile internal combustion engine. At Tube,
Its cross-sectional shape is formed into a flat oval shape. 2 is a corrugated fin made of copper or aluminum with good heat conductivity, and is provided with an appropriate louver (not shown) to improve the heat conductivity of the fin. A heat dissipation core portion 3 is formed by the tube 1 and the corrugated fins 2.
Air is blown into the core portion 3 in the direction of arrow A by a blower (not shown). 4
are core side plates joined to the left and right outermost fins 2; 5 and 6 are upper and lower tanks made of molded resin, for example, nylon resin containing glass fiber as a reinforcing material; the upper tank 5 has an inlet pipe 5a; A liquid injection port 5b, a mounting bracket 5c for mounting on the vehicle body, an air vent protrusion 5d, etc. are integrally molded.

Here, the liquid injection port 5b is provided at the top of the upper tank 5, and a pressure lid 7 is removably attached to it, and when a pressure valve (not shown) in this pressure lid 7 is opened, the upper tank A discharge pipe 5e for discharging air, water vapor, etc. in the liquid injection port 5b into a reserve tank (not shown) or into the atmosphere is integrally provided with the liquid injection port 5b. Further, as shown in FIGS. 5 and 6, the air vent protrusion 5d has the same height as the top of the inner surface of the inlet pipe 5a, and is formed from the liquid injection port 5b to the inlet pipe 5a. A space 5d' within the protrusion 5d allows the side of the liquid inlet 5b to communicate with the top of the inner surface of the inlet pipe 5a. The lower tank 6 has an outlet pipe 6
A, a mounting bracket 6b for mounting on the vehicle body, etc. are integrally molded from resin. Reference numeral 8 is a drain stock attached to the lower tank 6, and 9 is a header plate made of brass or aluminum, which has an oblong hole 9a with a collar for fixing the tube. Reference numeral 10 denotes an elastic sealing material interposed between the open ends 5f of the upper and lower tanks 5 and 6 and the peripheral edge 9b of the header plate 9.

To assemble the heat exchanger of the above embodiment, first, the joints of the tube 1, corrugated fins 2, core side plate 4, and header plate 9 are joined together by soldering or brazing, and then the header plate 9 is assembled. By interposing the elastic sealing material 10 between the peripheral edge part 9b and the end parts 5f of the tanks 5 and 6, and fitting the tip protrusion part 9c of the peripheral edge part 9b onto the open end parts 5f of the tanks 5 and 6, the The dirt plates 9, 9 and the tanks 5, 6 are watertightly connected. This allows the third
The entire heat exchanger shown in the figure can now be assembled.

In the heat exchanger having the above configuration, the engine coolant flows into the upper tank 5 from the inlet pipe 5a, and is distributed from here into each tube 1, and while flowing through the tubes 1, the engine coolant is cooled. The liquid is cooled by exchanging heat with cooling air blown by a blower (not shown), and returns to the engine side from the outlet pipe 6a via the lower tank 6.

On the other hand, the air contained in the engine coolant flowing in from the inlet pipe 5a floats to the top of the inner surface of the inlet pipe 5a due to its buoyancy, and the protruding portion 5
The liquid passes through the space 5d' in d and reaches the inside of the liquid injection port 5b, and is discharged from there to the outside of the upper tank 5 through the discharge pipe 5e. Therefore, problems such as a decrease in heat dissipation performance due to air being mixed into the coolant can be prevented.

In the above-described embodiment, the height of the protrusion 5d is set to be the same as the top of the inner surface of the inlet pipe 5a, but it may be made higher than the top of the inner surface of the inlet pipe 5a. If it is formed in a tapered shape so that the height gradually increases from the 5a side to the liquid injection port 5b side, the air can be discharged even better.

Further, the core portion 3 is not limited to a corrugated fin type, but may be of any type such as a plate fin type.

Further, the present invention provides an inlet pipe 5a to the upper tank 5.
Of course, a heat exchanger having the liquid injection port 5b can be applied to uses other than radiators.

As described above, the present invention includes an upper tank, a liquid injection port provided at the top of the upper tank, an inlet pipe provided in the upper tank for allowing liquid to flow into the upper tank, a lower tank, and the inlet pipe provided at the top of the upper tank. The tube is provided in the lower tank and includes an outlet pipe that drains the liquid from the lower tank, and a tube that communicates between the upper tank and the lower tank, and that extends from the liquid injection port to the inlet pipe in the upper tank. An air venting protrusion having a height substantially equal to or higher than the top of the inner surface of the inlet pipe is provided, and the space within this protrusion allows communication between the side of the liquid inlet and the top of the inner surface of the inlet pipe. Therefore, the air contained in the liquid from the inlet pipe can be reliably discharged to the liquid injection port side by the action of the space in the protrusion, and therefore the upper tank can be reliably discharged to the liquid injection port side without causing any problems in terms of air venting. It can be formed into a compact structure with a small capacity as shown in FIG. 6, and therefore has the great effect of providing a small, lightweight, and high-performance heat exchanger.

Moreover, since the protruding portion also functions as a reinforcing rib, the upper tank can be effectively reinforced, and when the tank is made of resin, warping of the resin tank can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a partial front view for explaining the problems of the heat exchanger in the process of devising the present invention, Fig. 2 is a sectional view taken along the line X--X in Fig. 1, and Figs. 3 to 6 are 3 is a perspective view of the entire heat exchanger, FIG. 4 is a partial sectional view of the heat exchanger, FIG. 5 is a partial front view of the heat exchanger, and FIG. 6 is a partial front view of the heat exchanger. 5 is a sectional view taken along YY arrow in FIG. 5. 1...Tube, 5...Upper tank, 5a...
Inlet pipe, 5b...liquid inlet, 5d...air vent protrusion, 5d'...space, 6...lower tank, 6
a...Exit pipe.

Claims (1)

[Claims] 1. An upper tank, a liquid injection port provided at the top of the upper tank, an inlet pipe provided in the upper tank for allowing liquid to flow into the upper tank, a lower tank, and the lower tank. The tube is provided in the tank and includes an outlet pipe that drains the liquid from the lower tank, and a tube that communicates between the upper tank and the lower tank, and a tube that extends from the liquid injection port to the inlet pipe in the upper tank. , characterized in that an air venting protrusion having a height substantially equal to or higher than the top of the inner surface of the inlet pipe is provided, and the space within the protrusion allows communication between the side part of the liquid inlet and the top of the inner surface of the inlet pipe. Heat exchanger. 2. The heat exchanger according to claim 1, wherein the liquid injection port, the inlet pipe, and the air vent protrusion are integrally molded with resin on the upper tank. 3. The heat exchanger according to claim 1 or 2, which is used as a radiator for radiating heat from an engine coolant of an internal combustion engine.