JPH05930U - Boiling cooler - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a boiling cooling device capable of reliably and promptly recirculating a coolant from a reserve tank to a cooling system after an engine is stopped. [Configuration] Circulation path 11 between the engine 1 and the steam separator 8
A return pipe 21 from the reserve tank 18 is connected to. The return pipe 21 is inserted from the upper surface of the reserve tank 18, and its end is open near the inner and lower surfaces. Further, a check valve 22 is provided in the conduit of the return pipe 21 so that the coolant flows only from the reserve tank 18 to the circulation path 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a boiling cooling device used for cooling an automobile engine or the like.

[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 request, and as shown in FIG. 4, the coolant is applied to the water jacket 3 on the cylinder block 2 side and the water jacket 5 on the cylinder head 4 side of the engine 1. And an outlet 7 are formed, and these are connected by circulation paths 11 to 14 in which a gas-liquid separator 8, a condenser 9, and a radiator 10 are arranged. In the figure, reference numeral 15 is a circulation pump for pressure-feeding a liquid-phase coolant (hereinafter referred to as a cooling liquid), which is provided in the circulation path 14 between the radiator 10 and the engine 1. Reference numeral 16 is a thermostat that connects the circulation path 11 and the circulation path 14 via the bypass pipe 17 during cooling, and opens and closes depending on the temperature of the coolant. Further, 18 is a reserve tank for storing the coolant overflowing from the circulation path 14 between the radiator 10 and the engine 1 at the time of warming up, and 19 is an overflow pipe. An electric fan 20 sends cooling air to the condenser 9 and the radiator 10 in accordance with the coolant temperature and the like.

In the boiling cooling device, first, the coolant boiling in the water jackets 3, 5 absorbs heat of vaporization to absorb heat of the cylinder block 2 and the cylinder head 4, and then the coolant is separated into a gas-liquid separator. The gas phase and the liquid phase are separated by 8. Then, the gas-phase coolant (hereinafter referred to as steam) is condensed and liquefied by the condenser 9, and the saturated cooling liquid is further cooled by the radiator 10 and is circulated to the engine 1 by the circulation pump 15. The reason why gas-liquid separation is performed in the boiling cooling device is that when the cooling liquid flows into the condenser 9, droplets adhere to the inner wall of the core tube (not shown) and the heat transfer efficiency between the steam and the core tube is significantly reduced. ..

[0005]

[Problems to be solved by the device]

 The boil cooling device has higher cooling efficiency than the conventional cooling device that circulates the coolant at a temperature below the boiling point, and also has the feature that a small amount of coolant is required. However, this device also had the following problems due to the presence of steam in the cooling system.

When the operation of the engine 1 is stopped, the engine temperature gradually decreases, and the cooling liquid thermally contracts in the cooling system, and the vapor also condenses and liquefies. As a result, the system internal pressure gradually decreases to generate a negative pressure, and the coolant in the reserve tank 18 flows back into the cooling system via the overflow pipe 19. However, in the conventional apparatus, because the overflow pipe 19 is connected to the circulation path 14 between the radiator 10 and the engine 1, the reflux from the reserve tank 18 is not smoothly performed, and the water jacket 3 is partially condensed without being condensed. , 4 and the upper part of the capacitor 9 sometimes remained. When the engine 1 is restarted in this state, cavitation may occur in the circulation pump 15 because the internal pressure of the cooling system is low, and the impeller or the like (not shown) may be damaged. In order to ensure that the coolant is recirculated to the cooling system, the overflow pipe 19 may be connected to the circulation paths 11 and 12 between the engine 1 and the condenser 9 in which steam is accumulated. However, if such piping is used, a large amount of steam will flow out to the reserve tank 18 at the time of operation, resulting in a drastic increase in coolant consumption.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a boiling cooling device that surely and quickly recirculates coolant from a reserve tank to a cooling system after an engine is stopped. ..

[0008]

[Means for Solving the Problems]

 Therefore, in order to solve this problem, the present invention is a boiling chiller that cools the engine by boiling the coolant in the water jacket of the engine and the heat of vaporization of the coolant. The present invention proposes a boiling cooling device characterized in that a return pipe communicating with the reserve tank and a check valve that allows only the flow from the reserve tank to the coolant circulation path are provided in the return pipe line. ..

[0009]

[Action]

 If the internal pressure of the cooling system drops after the engine is stopped, coolant will flow back from the reserve tank to the cooling system from the return piping in addition to the conventional overflow piping. At this time, since the return pipe communicates with the coolant circulation path from the engine where the steam accumulates to the condenser, the steam is quickly condensed and the cooling system is filled with the cooling liquid. On the other hand, during operation, the return pipe is closed by the check valve, so the flow of steam into the reserve tank is minimized.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows an embodiment of a boiling cooling device according to the present invention, and FIGS. 2 and 3 respectively show longitudinal sectional views of a check valve. As shown in FIG. 1, in the boiling cooling apparatus of the embodiment, a return pipe 21 from a reserve tank 18 is connected to a circulation path 11 between the engine 1 and the steam separator 8. The return pipe 21 is inserted from the upper surface of the reserve tank 18, and its end is open near the inner and lower surfaces. Further, a check valve 22 is provided in the conduit of the return pipe 21 so that the coolant flows only from the reserve tank 18 to the circulation path 11. As the check valve 22, a conical valve body 24 and a return spring 25 are incorporated in a body 23 as shown in FIG. 2, or a butterfly type valve body 24 is provided in the body 23 as shown in FIG. The one with the return spring 25 incorporated therein is used.

The operation of this embodiment will be described below. When the internal pressure of the cooling system decreases due to the stop of the operation of the engine 1, the coolant in the reserve tank 18 flows back into the cooling system not only from the overflow pipe 19 but also from the return pipe 21 in this embodiment. Since the return pipe 21 is connected to the circulation path 11 between the engine 1 and the steam separator 8 as described above, the refluxed cooling water directly enters the steam accumulated above the engine 1 and the condenser 9. It will flow in. Since the coolant in the reserve tank 18 has a relatively low temperature, the steam is quickly cooled and condensation / liquefaction is promoted. As a result, no steam remains in the water jackets 3 and 4 and the condenser 9, which is a problem in the conventional apparatus, and cavitation in the circulation pump 15 is prevented. On the other hand, during the operation in which the internal pressure of the cooling system rises, the check valve 22 prevents the coolant from flowing out from the return pipe 21 to the reserve tank 18. Therefore, the outflow of vapor to the reserve tank 18 is minimized, and the consumption amount of the coolant is suppressed to the same level as the conventional device.

Although the description of the specific embodiment is finished above, the aspect of the present invention is not limited to this embodiment. For example, the return pipe 21 may be connected to the circulation path 12 between the steam separator 8 and the condenser 9, or the check valve 22 may be of a type other than that shown in FIGS. May be.

[0013]

[Effect of the device]

 According to the boiling cooling device of the present invention, the coolant circulation path between the engine and the condenser and the reserve tank are connected by the return pipe having the check valve, so that the engine consumption can be increased without increasing the coolant consumption. This has the effect of allowing the coolant to flow back from the reserve tank to the cooling system reliably and promptly after the stop.

[Brief description of drawings]

FIG. 1 is a perspective view showing a boiling cooling device according to the present invention.

FIG. 2 is a vertical sectional view of a check valve.

FIG. 3 is a vertical sectional view of a check valve.

FIG. 4 is a conceptual diagram showing a conventional boiling cooling device.

[Explanation of symbols]

 1 Engine 3,5 Water jacket 8 Steam separator 9 Condenser 10 Radiator 11-14 Circulation path 18 Reserve tank 19 Overflow piping 21 Return piping 22 Check valve

Claims (1)

Claims for utility model registration 1. A boiling cooling device for boiling a coolant in a water jacket of an engine to cool the engine by the heat of vaporization of the coolant. A boiling cooling device comprising: a return pipe communicating with a reserve tank; and a check valve that allows only a flow from the reserve tank to a coolant circulation path in a pipeline of the return pipe.