JPH0712666Y2 - Engine cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an engine cooling device using a boiling cooling system.

(Prior Art and Problems Thereof) FIG. 5 shows an example of a conventional cooling device of this type.

The cooling water, which is heated by cooling the engine 1 and partially evaporated to form a mixture of water and steam, enters the steam separator 3 through the outlet pipe 2, where the water and steam are separated. To be separated. The separated water goes through the return pipe 10 and the water pump
Inhaled on 11. The separated steam enters the condenser 7 through the steam pipe 5, where it is cooled by heat exchange with the outside air or the like to be condensed and liquefied. Then, the water liquefied in the condenser 7 enters the return pipe 10 through the drain pipe 8, joins the water from the steam separator 3 and is sucked into the water pump 11. In FIG. 5, 4 is a baffle plate and 6 is a pressure regulating valve.

In this cooling device, most of the water sucked into the water pump 11 is the water that returns directly from the steam separator 3, which is heated in the engine 1 until just before boiling.
There was a problem that the negative pressure generated on the suction side of the water pump 11 immediately vaporized, and as a result, the impeller and the like of the water pump 11 were damaged by cavitation.

In order to deal with this, the cooling device shown in FIG. 6 has been proposed.

The steam of the cooling water generated by cooling the engine 1 rises in the steam pipe 5 and enters the condenser 7, where it is condensed and liquefied. Then, the water liquefied in the condenser 7 flows into the engine 1 through the drain pipe 8 due to its own weight.

In this cooling device, since the cooling water circulates by convection, there is a problem that the cooling of the engine 1 becomes uncertain because a vapor pool is generated inside the engine 1 and there is a place where the cooling water cannot reach. It was

(Means for Solving the Problems) The present invention has been proposed to solve the above problems, and its gist is to describe a mixture of water and steam heated by cooling an engine. The tangential direction from the upper peripheral wall into the upright cylindrical steam-water separator and condensate the condensed water from the steam-separated steam from the condenser from the middle peripheral wall of the steam-water separator. The water in the steam-water separator is rotated by flowing in the same tangential direction as the inflow direction of the mixture, and the water is taken out tangentially from the outer periphery of the bottom of the steam-water separator along the flow of the water pump. The engine cooling device is characterized in that it is pressure-fed.

It is desirable that a bottom surface of the steam separator is provided with an inclined surface that becomes lower toward the downstream side along the flow of water rotating in the steam separator.

(Operation) In the present invention, because of the above configuration, the water in the steam separator is a mixture of water and steam tangentially flowing in from the upper peripheral wall of the steam separator and the middle stage of the steam separator. It continues to rotate by being urged by the condensed water flowing from the peripheral wall in the same tangential direction as the inflow direction of the mixture. Then, this water is taken out tangentially along the flow from the outer periphery of the bottom of the steam separator, so that it is guided to the water pump with rotational kinetic energy.

When the bottom surface of the steam separator is provided with an inclined surface that becomes lower toward the downstream side along the flow of water, the rotational kinetic energy of water rotating in the steam separator can be more effectively used.

(Embodiment) One embodiment of the present invention is shown in FIGS.

The steam separator 3 has an upright cylindrical shape, and a mixture of water and steam is tangentially introduced from an upper peripheral wall of the separator. Further, the bottom surface of the steam separator 3 is provided with an inclined surface 9 which becomes lower toward the downstream side along the flow of water rotating in the steam separator 3, and the lowermost end of the inclined surface 9, that is, ,
A return pipe 10 is connected to the outer periphery of the bottom so that the water rotating in the steam separator 3 can be taken out tangentially along the flow.

Further, a drain pipe 8 is connected to the middle stage of the steam separator 3 so that the water condensed in the condenser 7 flows tangentially. Other configurations are similar to those of the conventional one shown in FIG. 5, and corresponding members are designated by the same reference numerals.

Thus, the mixture of water and steam heated by cooling the engine 1 passes through the outlet pipe 2 and the steam separator 3
It flows in tangentially from its upper peripheral wall into the steam-water separator 3
The water inside is rotated along its inner wall, and the water surface rises higher toward the outer circumference. Then, the steam is separated from the water in the steam-water separator 3, bypasses around the baffle plate 4, flows out from the top of the steam-water separator 3, and passes through the steam pipe 5 to the condenser 7
Then, it is cooled by outside air and condensed and liquefied.
The liquefied water flows through the drain pipe 8 into the steam separator 3 from its middle stage in the tangential direction. Then, the water in the steam separator 3 gradually descends while rotating, is guided by the inclined surface 9 of the bottom surface thereof and reaches the lower end thereof, and the rotational kinetic energy and the inside and outside of the steam separator along the flow from the outer circumference of the bottom portion. It flows out in the tangential direction with a static pressure due to the rise of the water surface of the circumference, and is pumped to the water pump 11 via the return pipe 10. As a result, the water pump 11 is operated in a state where no negative pressure is generated on its suction side, so that the impeller is not damaged by cavitation.

(Effect of the Invention) In the present invention, the mixture of water and steam heated by cooling the engine flows tangentially from the upper peripheral wall thereof into the upright cylindrical steam separator, and is condensed. Since the condensed water from the vessel flows in the same tangential direction as the inflow direction of the mixture from the middle peripheral wall of the steam-water separator, the water in the steam-water separator rotates at a high speed and The water surface rises high.

On the other hand, since the water rotating in the steam separator is taken out tangentially along the flow from the outer periphery of the bottom and pumped to the water pump, the water in the steam separator has kinetic energy and It is sent to the water pump with a static pressure due to the rise of the water surface inside and outside the water separator.

Therefore, it is possible to prevent negative pressure from being generated on the suction side of the water pump, and thus to prevent the impeller of the water pump from being damaged by cavitation.

As a result, since the water can be urged by using the water pump, it is possible to prevent a place where the water does not reach in the jacket of the engine, and to cool the engine efficiently by the boiling cooling method. .

Further, if the bottom surface of the steam separator is provided with an inclined surface that becomes lower toward the downstream side along the rotating water flow, the kinetic energy due to the rotation of water can be used more effectively.

[Brief description of drawings]

1 to 4 show one embodiment of the present invention, FIG. 1 is a schematic system diagram, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 4 is a sectional view taken along the line III-III in FIG. 4, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. 5 and 6 are schematic system diagrams of the conventional device. Engine …… 1, outlet pipe …… 2, steam separator …… 3, inclined surface …… 9, return pipe …… 10, water pump …… 11

Claims (2)

[Scope of utility model registration request] 1. A mixture of water and steam heated by cooling an engine is introduced into an upright cylindrical steam-water separator tangentially from its upper peripheral wall and separated by the steam-water separator. The condensed water from the condenser for condensing the steam is rotated through the middle wall of the steam-water separator in the same tangential direction as the inflow direction of the mixture to rotate the water in the steam-water separator. An engine cooling device, characterized in that it is taken out tangentially from the outer periphery of the bottom of the steam separator along the flow thereof and is pumped to a water pump. 2. The bottom surface of the steam separator is provided with an inclined surface which becomes lower toward the downstream side along the flow of water rotating in the steam separator. The engine cooling system described.