JPH0547343U - Radiator for boiling cooling system - Google Patents

Abstract

(57) [Abstract] [Purpose] To simplify the boiling cooling device and improve the heat transfer coefficient. A radiator 3 used in a boiling cooling device that cools an engine by boiling the coolant in a water jacket of the engine and utilizing boiling heat transfer.
1, by providing the inner fins 32 inside the core tube 23a, the heat transfer area of the core tube 23a through which the liquid-phase coolant flows is made larger than the heat transfer area of the core tube 23b through which the gas-phase coolant flows. Cool some liquid-phase separated liquid-phase coolant sufficiently.

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.

FIG. 3 shows a conventional downflow type radiator used in a boiling cooling apparatus.

As shown in FIG. 3, as shown in the figure, a large number of core tubes 23 are provided horizontally between the pair of left and right side tanks 21, 22, and between the core tubes 23. Is provided with a heat dissipation corrugated fin 24. An inlet 25 for the vapor phase coolant is formed in the upper part of one side tank 21, and an outlet 26 for the condensed and liquefied coolant is formed in 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. Then, the gas-phase coolant is introduced into the radiator 8 and condensed and liquefied while flowing through the core tube 23 of the radiator 8. The liquefied coolant is further cooled and sent 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 above-mentioned boiling cooling device, in order to efficiently perform the condensation cooling, the gas-liquid separator 11 is arranged on the upstream side of the radiator 8 and the coolant is separated into the gas-phase coolant and the liquid-phase coolant, and only the gas-phase coolant is provided. It is flowing into the radiator 8. Therefore, there is a problem that the device configuration becomes complicated and the cost becomes high.

The present invention solves such a problem, and an object of the present invention is to provide a radiator having a gas-liquid separation function, and to simplify a boiling cooling device.

[0011]

[Means for Solving the Problems]

 The radiator for a boil cooling device of the present invention for achieving the above object is used in a boil cooling device for cooling an engine by boiling the coolant in the water jacket of the engine and utilizing boiling heat transfer. In the radiator, the heat transfer area of the core tube in which the liquid-phase separated liquid-phase coolant flows is made larger than the heat transfer area of the core tube in which the gas-phase coolant flows.

[0012]

[Action]

 Although the liquid-phase separated liquid-phase coolant in the radiator has a low flow rate, the heat transfer area of the core tube through which the gas-liquid separated liquid-phase coolant flows is made larger than the heat transfer area of the core tube through which the gas-phase coolant flows. As a result, the heat transfer rate of the liquid-phase coolant is improved.

[0013]

【Example】

 FIG. 1 shows a cross section of a radiator for a boiling cooling device according to an embodiment of the present invention. The members having the same functions as those in the related art are designated by the same reference numerals, and the duplicated description will be omitted.

In the radiator for a boiling cooling apparatus of this embodiment, the heat transfer area of the core tube through which the liquid-phase separated liquid-phase coolant flows is made larger than the heat transfer area of the core tube through which the gas-phase coolant flows. I am doing it.

As shown in FIG. 1, in a radiator 31 for a boiling cooling device, a large number of core tubes 23a and 23b are provided between a side tank 21 into which a coolant flows and a side tank 22 from which condensed water of the coolant is discharged. A corrugated fin 24 for heat dissipation is provided along the horizontal direction and between the core tubes 23a and 23b. A coolant inlet 25 is provided at the lower portion of the side tank 21, while a condensed water outlet 26 of the condensed liquefied coolant is provided at the lower portion of the side tank 22.

Inner fins 32 are provided inside the core tube 23 a located below the radiator 31. Therefore, the heat transfer area of the core tube 23a is larger than the heat transfer area of the core tube 23b.

The coolant that has flowed in from the inflow port 25 of the side tank 21 is separated here into a vapor-phase coolant and a liquid-phase coolant. Then, the liquid-phase coolant (condensed water) flows into the side tank 22 through the inside of the lower core tube 23a. On the other hand, the vapor-phase coolant (steam) has a low specific gravity and therefore rises in the side tank 21, enters the upper core tube 23b, condenses there, becomes a liquid phase, and flows into the side tank 22. Then, it flows out from the outlet 26 together with the cooled liquid phase coolant in the side tank 22.

At this time, since the heat transfer area of the core tube 23a is larger than the heat transfer area of the core tube 23b, the liquid-phase separated liquid-phase coolant has a low flow rate but is sufficiently cooled. It

The gas-phase coolant and the liquid-phase coolant thus separated from each other are made to flow from the separate core tubes 23a and 23b to the side tank 22, and the inner fins 32 are provided inside the core tube 23a. Since the heat transfer area of the core tube 23a through which the gas flows is made larger than the heat transfer area of the core tube 23b through which the gas-phase coolant flows, it is possible to separate the gas and liquid of the coolant with a radiator without attaching a special gas-liquid separation mechanism. This can be done and the gas-liquid separator can be omitted, and the liquid coolant with a low flow rate can be sufficiently cooled to improve the heat transfer coefficient.

In the above-described embodiment, in order to make the heat transfer area of the core tube 23a through which the liquid-phase separated liquid-phase coolant flows larger than the heat transfer area of the core tube 23b through which the gas-phase coolant flows, Although the inner fin 32 is provided inside the core tube 23a, the present invention is not limited to this. For example, the heat transfer area may be increased by forming the inner surface of the core tube 23a in an uneven shape.

[0021]

[Effect of the device]

 As described above in detail with reference to the embodiments, according to the radiator for a boiling cooling device of the present invention, in the radiator used for the boiling cooling device utilizing boiling heat transfer, the liquid-phase coolant separated into gas and liquid is used. The heat transfer area of the core tube through which the gas flows is made larger than the heat transfer area of the core tube through which the gas-phase coolant flows.Therefore, the coolant flowing from the inlet is separated into gas and liquid inside the radiator to achieve a special gas-liquid separation. Coolant gas-liquid separation can be performed with a simple structure without attaching a separation mechanism, and the boiling-cooling device can be simplified by omitting the gas-liquid separator of the boiling cooling device. It is possible to improve the heat transfer coefficient by sufficiently cooling the liquid phase coolant, which has a low flow rate.

[Brief description of drawings]

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

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

FIG. 3 is a perspective view of a conventional cross-flow type radiator.

[Explanation of symbols]

 21, 22 Side tank 23a, 23b Core tube 24 Corrugated fin 25 Coolant inlet 26 Coolant outlet 31 Radiator 32 Inner fin

Claims (1)

[Scope of utility model registration request] 1. A radiator 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, wherein liquid-phase separated liquid-phase coolant flows. A radiator for a boiling cooling device, characterized in that the heat transfer area of the core tube is formed larger than the heat transfer area of the core tube through which the vapor phase coolant flows.