JP2539897Y2 - Radiator for boiling cooling device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator for a boiling cooling device used for cooling, for example, an automobile engine.

[0002]

2. Description of the Related Art In recent years, high output has been promoted in engines for automobiles and the like by using a supercharger or using a multi-valve intake and exhaust system. As a result, the calorific value during operation is much larger than that of the conventional one, and a high-performance cooling device is required.

[0003] The boiling cooling device has been developed in response to such a demand, and FIG. 2 shows the overall configuration of the boiling cooling device.

As shown in FIG. 2, an inlet 6 for coolant (coolant) is formed in the water jacket 3 on the cylinder block 2 side of the engine 1, and an outlet for coolant is formed in the water jacket 5 on the cylinder head 4 side. 7 are formed. The inlet 6 is connected to a radiator 8 by a circulation path 10 via a circulation pump 9, and the outlet 7 is connected to the radiator 8 by a circulation path 10 via a gas-liquid separator 11.
It is connected to. The gas-liquid separator 11 separates the liquid-phase coolant and the gas-phase coolant and guides only the gas-phase coolant to the radiator 8.
It is sent to the water jacket 3 without passing through. In the figure, 1
Reference numeral 2 denotes a reserve tank that stores the coolant that has overflowed from the circulation path 10 during warm-up, and 13 denotes an electric fan that forcibly sends cooling air to the radiator 8 according to the temperature of the coolant.

[0005] A conventional radiator 8 used in a boiling cooling device will be described with reference to FIG. FIG. 3 shows a front view of a conventional radiator.

As shown in the figure, a pair of side tanks 2
A large number of core tubes 23 are provided horizontally between the core tubes 1 and 22, and corrugated fins 24 for heat radiation are provided between the core tubes 23. An inlet 25 for a gas-phase coolant is provided at an upper portion of one side tank 21, and an outlet 26 for a condensed and liquefied coolant is provided at a lower portion of the other side tank 21.

In the above-mentioned boiling cooling device, the heat of the cylinder head 4 is absorbed by utilizing the boiling heat transfer of the coolant that has boiled in the water jacket 5, and the coolant that has become steam is vaporized by the gas-liquid separator 11. Separate into liquid and gas phase coolant. The gas-phase coolant is introduced into the radiator 8 from the inlet 25 and is condensed and liquefied while flowing through the core tube 23. The liquefied coolant is further cooled and sent to the water jacket 3 from the outlet 26 by the circulation pump 9.

[0008] The boiling cooling device has a higher cooling efficiency than a cooling device that circulates cooling water at a temperature lower than the boiling point, and the circulation amount of the coolant may be small.

[0009]

In the radiator 8 used in the above-mentioned boiling cooling device, the gas-phase coolant is condensed and liquefied while flowing through the core tube 23, and steam is contained inside the downstream side of the core tube 23. Condensed water will be mixed. For this reason, FIG. 4 showing an arrow IV-IV in FIG.
As shown in (2), a water film is formed below the core tube 23 in a portion where the steam 26 and the condensed water 27 coexist. Since the water film serves as a thermal resistance of heat passing from the steam 26 to the cooling air 28, there is a possibility that a heat radiation amount is reduced and cooling efficiency is deteriorated.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a configuration of the present invention is a boiling cooling device that cools an engine by boiling a coolant in a water jacket of the engine and utilizing boiling heat transfer. In the cross-flow type radiator in which the core tube is horizontally disposed, a condensed water flow path for flowing the condensed water in the core tube is provided in the core tube on the cooling air outflow side. .

[0011]

The condensed water is collected in the condensed water flow path in the core tube where the steam and the condensed water are mixed, thereby securing a large area occupied by the steam on the inner surface of the core tube.

[0012]

FIG. 1 is a sectional view of a main part of a radiator for a boiling cooling apparatus according to an embodiment of the present invention.

In the figure, 31 is a core tube provided horizontally between a pair of side tanks (not shown), and 32 is a corrugated fin for heat dissipation provided between the core tubes 31.

A condensed water passage 33 having a lower bottom surface is formed in the core tube 31 on the cooling air outflow side (the right side in the figure), and the condensed water 34 of the gas phase coolant condensed and liquefied inside the core tube 31 is formed. It collects in the condensed water channel 33. Although the flow path of the cooling air is narrow at the condensed water flow path 33, most of the air-side pressure loss of the radiator is
2 has almost no effect.

According to the above-described structure, in the core tube 31 where the vapor-phase coolant is condensed and liquefied and the steam 35 and the condensed water 34 are mixed, the condensed water 34 is collected in the condensed water passage 33 and Condensed water 34 on the lower side
No water film is formed, and a large area occupied by the steam 35 on the inner surface of the core tube 31 can be secured.

[0016]

[Effect of the invention] The radiator for the boiling cooling device of the invention is:
Since the condensed water flow path is provided in the core tube, the condensed water is collected in the condensed water flow path in a portion where the steam and the condensed water are mixed, and a condensed water film is not formed on the lower side of the core tube. A large area occupied by steam on the inner surface of the tube can be secured. As a result, the thermal resistance of heat passing from the steam to the cooling air is reduced, and the cooling efficiency does not deteriorate.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a radiator for a boiling cooling device according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram for a boiling cooling device.

FIG. 3 is a front view of a conventional radiator.

FIG. 4 is a view taken along line IV-IV in FIG. 3;

[Explanation of symbols]

 31 core tube 32 corrugated fin 33 condensed water channel 34 condensed water 35 steam

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuji Ukita 5-33-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation (56) References JP-A-54-125563 (JP, A) Showa 61-23415 (JP, U) Actually open Showa 59-76882 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A cross-flow type cooling system in which a coolant is boiled in a water jacket of an engine to cool the engine by utilizing boiling heat transfer, and a core tube is disposed horizontally. In the radiator, a condensed water flow path for allowing condensed water in the core tube to flow through the core tube on the cooling air outflow side is provided.