JPH0547342U - Radiator for boiling cooling system - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the heat resistance of heat passage from steam to cooling air and prevent deterioration of cooling efficiency. [Configuration] A core tube 31 is provided with a condensed water flow path 33,
The condensed water 34 is collected in the condensed water flow path 33 by the core tube 31 in the portion where the steam 35 and the condensed water 34 are mixed, and the formation of a water film of the condensed water 34 on the lower side of the core tube 31 is prevented. It reduces the heat resistance of the heat transfer to and prevents the deterioration of cooling efficiency.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a radiator for a boiling cooling device used for cooling an automobile engine, for example.

[0002]

[Prior Art]

 In recent years, in engines for automobiles and the like, higher output has been promoted by using a supercharger or using a multi-valve intake / exhaust system. As a result, the amount of heat generated during operation is significantly higher than that of the conventional one, and a high-performance cooling device is also required.

The boiling cooling device was developed in response to such a demand, and FIG. 2 shows the entire structure of the boiling cooling device.

As shown in FIG. 2, the water jacket 3 on the cylinder block 2 side of the engine 1 is formed with an inlet 6 for cooling liquid (coolant), and the water jacket 5 on the cylinder head 4 side is provided with an outlet for coolant. 7 are formed. The inflow port 6 is connected to the radiator 8 by a circulation path 10 via a circulation pump 9, and the outflow port 7 is connected to the radiator 8 by a circulation path 10 via a gas-liquid separator 11. 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. The liquid-phase coolant is sent to the water jacket 3 without passing through the radiator 8. In the figure, 12 is a reserve tank that stores the coolant that overflows from the circulation path 10 during warm-up, and 13 is an electric fan that forcibly sends cooling air to the radiator 8 according to the temperature of the coolant and the like.

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 large number of core tubes 23 are horizontally provided between the pair of side tanks 21 and 22, and corrugated fins 24 for heat dissipation are provided between the core tubes 23. . An inflow port 25 for the vapor-phase coolant is provided at the upper part of the one side tank 21, and an outflow port 26 for the condensed liquefied coolant is provided at the lower part of the other side tank 21.

In the boiling cooling device described above, 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 boiled to become vapor is separated into the gas-liquid separator 11 Separate into liquid-phase coolant and gas-phase coolant. The vapor-phase coolant is introduced into the radiator 8 through the inflow port 25, and is condensed and liquefied while flowing through the core tube 23. The liquefied coolant is further cooled and sent from the outlet 26 to the water jacket 3 by the circulation pump 9.

The boiling cooling device has a higher cooling efficiency than a cooling device that circulates cooling water at a temperature below the boiling point, and a small amount of coolant may be circulated.

[0009]

[Problems to be solved by the device]

 In the radiator 8 used in the above-described boiling cooling device, the vapor-phase coolant is condensed and liquefied while flowing through the core tube 23, and steam and condensed water are mixed inside the wake side of the core tube 23. Therefore, as shown in FIG. 4 which is a view taken along the line IV-IV in FIG. 3, a water film is formed below the core tube 23 at the portion where the steam 26 and the condensed water 27 are mixed. End up. 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 the heat radiation amount is reduced and the cooling efficiency is deteriorated.

[0010]

[Means for Solving the Problems]

 The structure of the present invention for solving the above problems is used in a boiling cooling device that cools an engine by boiling the coolant in the water jacket of the engine to utilize the boiling heat transfer. A horizontally arranged cross-flow type radiator is characterized in that a condensed water flow path for allowing condensed water in the core tube to flow is provided in the core tube on the cooling air outflow side.

[0011]

[Action]

 In the core tube where steam and condensed water coexist, the condensed water is collected in the condensed water flow path to secure a large area occupied by the steam on the inner surface of the core tube.

[0012]

【Example】

 FIG. 1 shows a cross section of a main part of a radiator for a boiling cooling device according to an embodiment of the present invention.

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

A condensed water flow path 33 having a lower bottom surface is formed in the core tube 31 on the cooling air outflow side (right side in the figure), and condensed water of the vapor phase coolant condensed and liquefied inside the core tube 31 is formed. 34 gather in the condensed water flow path 33. Although the cooling air flow path becomes narrower at the portion of the condensed water flow path 33, most of the air-side pressure loss of the radiator is occupied by the corrugated fins 32, so there is almost no effect.

According to the above-described configuration, in the core tube 31 in the portion where the vapor-phase coolant is condensed and liquefied and the vapor 35 and the condensed water 34 are mixed, the condensed water 34 is collected in the condensed water passage 33, and the core tube 31 There is no formation of a water film of condensed water 34 on the lower side, 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 device]

 Since the radiator for the boiling cooling device of the present invention has the condensed water flow passage in the core tube, the condensed water is collected in the condensed water flow path in the core tube where steam and condensed water are mixed, and Since there is no water film of condensed water, it is possible to secure a large area occupied by steam on the inner surface of the core tube. As a result, the thermal resistance of the heat passing from the steam to the cooling air is reduced, and the cooling efficiency does not deteriorate.

[Brief description of 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 the line IV-IV in FIG.

[Explanation of symbols]

 31 Core Tube 32 Corrugated Fin 33 Condensed Water Flow Path 34 Condensed Water 35 Steam

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuji Ukita 5-3-8, Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation

Claims (1)

[Scope of utility model registration request] 1. A cross-flow type in which a core tube is horizontally arranged, which is used in a boiling cooling device for cooling an engine by boiling the coolant in a water jacket of the engine and utilizing boiling heat transfer. A radiator for a boiling cooling device, characterized in that a condensate flow passage for allowing condensed water in the core tube to flow is provided in the core tube on the cooling air outflow side.