JPS6193225A - Air vent structure in engine cooling water circulating system - Google Patents

Abstract

PURPOSE:To make air-bleeding in time of injection of cooling water ever so easy, by installing an interconnecting pipe which interconnects an uppermost part of a radiator upper hose to that of a heater upper host and then installing an air vent part in this interconnecting pipe. CONSTITUTION:An uppermost part in an upper host 3 of a radiator 2 is interconnected to that in an upper hose 7 of a heater core 6 with an interconnecting pipe 16, while an air vent part 10 is installed in this interconnecting pipe 16. In time of injection of cooling water, a screw cock 14 is warmed and cooling water is injected into the radiator 2 from an injection port 2a. At this time, a thermostat 5 is low temperature and closed and, after the radiator is filled up, this cooling water passes through the radiator hose 3 and flows into the heater core 6 from the heater upper hose 7 while filling up an engine 1. Air inside the heater core 6 passes through the hose 7 and the interconnecting pipe 16 against inflow water from the upper host 7 and then discharged out of the air vent part 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to an air vent structure for an engine cooling water circulation system.

Conventionally, there is a conventional air bleed structure for this type of engine cooling water circulation system as shown in Fig.
96430). Engine 1 and radiator 2 are
radiator upper hose 3 in each upper position and radiator lower hose 4 in each lower position.
connected by. With radiator lower hose 4 of engine 1.

A thermostat 5 is provided near the connection. On the other hand, the lower position of the engine 1 and the upper position of the heater core 6 are connected by a heater upper hose 7, and the upper position of the engine 1 and the lower position of the heater core 6 are connected by a heater lower hose 8. By connecting in this way, an engine cooling water circulation system is formed.

Further, an air bleed hose 9 is connected near the connection point of the radiator upper hose 3 of the engine 1 to communicate the highest level of the circulation system of the engine 1 with the cooling water inlet 2a of the radiator 2.

Now, when injecting cooling water into this mQ system, inlet 2
When cooling water is injected from the radiator 2, it flows down inside the radiator 2. As shown in this figure, some recent engines 1 are equipped with a thermostat 5 at the bottom, so the cooling water is dammed here, and the air in the radiator lower hose 4 and radiator 2 flows from the inlet 2a. The water is sequentially expelled, and when the radiator becomes full of water, it flows into the engine 1 from the radiator upper hose 3. As the water level inside engine 1 rises, the air inside engine 1 sequentially
It is expelled from the inlet 2a via the radiator upper hose 3 and the air release hose 9. The water level that has further risen will rise sequentially from the bottom of the heater upper hose 7, or
If the heater core 6 is provided at a low position, the water will flow into the heater core 6. To a certain extent, the air in the heater upper hose 7 and the heater core 6 is transferred sequentially to the heater lower hose 8, the engine 1, and the radiator upper hose 3.
and is discharged via the air purge hose 9.

When the water level of the engine 1 reaches the upper end position of the heater lower hose 8, the cooling water flows into the heater core 6 from the upper end of the heater lower hose 8 and fills the heater core 6. However, since the higher side of the air in the heater core 6 is blocked by cooling water, the air in the heater core 6 has no place to escape, and is compressed by the cooling water that has accumulated from the lower side of the heater core 6. Therefore, air cannot be completely vented and the inside of the heater core 6 is not filled with water.

Problems to be Solved by the Invention By the way, if the engine 1 is operated in such a state that air cannot be completely removed from the circulation system, the cooling water is likely to run out, and due to the lack of water, steam is likely to be generated, resulting in overheating. There is a problem with that. To solve this problem, you can eliminate the air as much as possible by waiting a while, or by repeatedly injecting the coolant again after running the engine 1 and circulating the coolant, but this takes a lot of effort. It requires Further, providing air bleed directly to the heater core increases the number of air bleed locations, resulting in poor workability, and is even more difficult because the heater core is located in a location that is generally difficult to work with.

To solve the problem, the present invention provides a communication pipe that communicates the highest position of the radiator upper hose with the highest position of the heater upper hose, and provides an air vent in the communication pipe.

Operation When engine cooling water is injected from the radiator, the water flowing from the top of the engine through the heater lower hose causes the air in the heater core to flow, mostly without passing through the heater lower hose or engine. The air is discharged from the highest position of the heater upper hose through the communication pipe and is discharged from the air vent, and the heater core and the inside of the heater hose are replaced with cooling water. Therefore, air is also bled from the engine in the same way, and the air in the engine cooling water circulation system is completely replaced with cooling water, allowing the engine to continue operating without overheating.

Isamu Oarashi Next, the present invention will be explained based on the drawings.

FIGS. 1 to 4 are diagrams showing an embodiment of an air bleed structure for an engine cooling water circulation system according to the present invention. In the figure,
The same reference numerals are given to the same or equivalent parts or members as in the prior art, and redundant explanation will be omitted.

The engine 1 and radiator 2 are arranged in the engine room of the automobile, and the heater core 6 is arranged in the passenger compartment.The engine cooling water circulation system is long and complicated. is the same as , but differs in the following points. That is, a communication pipe 16 is provided that connects the highest position of the radiator upper hose 3 and the highest position of the heater upper hose 7. This communication pipe 16 may be made integrally with the heater upper hose 7, or may be connected to it via a known connection means. In addition, the communication pipe 1
6 is provided with an air bleed portion 10. In this embodiment, the air vent portion 10 is provided on the radiator upper hose 3 side of the communication pipe 16.

In detail, as shown in FIGS. 2 to 4, the air bleed part 10 separates the radiator upper hose 3, connects the base pipe 11 inserted between the parts, and connects the base pipe 11 at right angles from the base pipe 11. It is composed of a protruding branch pipe 12, a tube 13 protruding to the side of the branch pipe 12, and a screw cock 14 that closes or opens the opening of the tube 13 to the branch pipe 12 and to the atmosphere. The male screw 1 of the screw cock 14 is attached to the branch pipe 12.
A female screw 12a that is screwed into the housing 4a and a seat portion 12b on which a gasket 15 is installed are provided.

It is also possible to provide a vertical groove on the male screw 14a so that when the screw cock 14 is loosened, the vertical groove communicates with the atmosphere above the tube 13 and the packing 15, thereby facilitating air bleeding.

Next, the effect of air bleeding will be explained.

First, 1. Second. As shown in Fig. 4, open the inlet 2a, loosen the screw cock 14, and remove the radiator upper hose 3.
and the communication pipe 16, and communicate these with the atmosphere. Next, when engine cooling water is injected from the injection port 2a, the thermostat 5 is closed at a low temperature, and after the radiator 2 is filled, the engine 1 is filled through the radiator hose 3, and the heater core 6 is filled from the heater upper hose 7.
and fills the heater core. At this time, the air in the radiator 2 comes out from the inlet 2a to replace the cooling water. Air in the engine 1 is discharged from above the engine 1 through the radiator upper hose 3 from the injection port 2a or from a location opened by the screw cock I4 of the air bleed portion IO as shown by the hollow arrow. The air in the heater core 6 passes through the heater upper hose 7 through the communication pipe 16 as indicated by the hollow arrow against the water flowing in from the heater upper hose 7, and is discharged from the air bleed part 10.
The air is discharged from the air bleed section 10 via the heater lower hose 8, the engine 1, and the radiator upper hose 3.

By the way, the air discharge from the heater lower hose 8 is as follows:
Until the opening of this heater lower hose 8 into the radiator core 6 is blocked with cooling water, this is the initial stage when the heater core 6 is filled with cooling water, and after that, it is exclusively connected from the heater upper hose 7. It is discharged through tube 16.

Even when the heater core 6 is located at a lower position than the engine 1, it is reliably discharged. Therefore, the communication pipe 16 is connected to the highest position of the heater upper hose 7 which is connected to the highest position of the heater core 6, and the air is sequentially expelled from within the heater core 6, filling the heater core 6 full and at least draining the heater upper hose 7. It also fills the communication pipe 16, causing cooling water to be blown back from the air vent part 10. Therefore, stop the injection and close the injection port cap.1. By tightening the screw cock 14, this engine cooling water circulation system is sealed.

When the engine 1 is operated in this state, under low temperature conditions, the movement of cooling water is slightly caused by convection within the engine 1.
When the temperature reaches a predetermined temperature or higher, the valve of the thermostat 5 opens.
As shown by the arrow, connect the radiator upper hose 3 from the top of the engine 1. Circulation back to the engine 1 via the radiator 2 and radiator lower hose 4 is performed by a water pump (not shown). In addition, by opening the heater valve (not shown), the heater core 6 is connected to the heater lower hose 8. Circulation of the heater core 6, heater upper hose 7, and engine 1 is performed by a pump (not shown). Since air is completely removed, cooling water circulates smoothly and overheating does not occur.

As explained above, according to the present invention, there is provided a communication pipe that communicates the highest position of the upper hose of the radiator with the highest position of the heater upper hose, and the communication pipe is provided with an air bleed part. Therefore, even if the heater core is separated from the engine and placed in an arbitrary position, it is possible to ensure that air is completely removed from the engine cooling water circulation system and filled with engine cooling water by injection twice. Therefore, the injection work is very easy as it only requires opening and closing the radiator cap and the air vent in the vicinity.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an embodiment of the air bleed structure of an engine cooling water circulation system according to the present invention, Fig. 2 is a perspective view of the air bleed part with the screw cock loosened, and Fig. 3 is a diagram of the air bleed part. A normal central sectional view, FIG. 4 is a diagram similar to FIG. 3 in an air-bleeding state, and FIG. 5 is a schematic configuration diagram similar to the conventional diagram in FIG. 1. 1...Engine, 2...Radiator. 3...Radiator upper hose, 6...Heater core, 7...Heater upper hose, 10...Air vent, 16...Communication pipe.

Claims (1)

[Scope of Claims] In an air release structure for an engine cooling water circulation system that connects an engine, a radiator, and a heater core to circulate engine cooling water, the highest position of a radiator upper hose of the radiator and the highest position of a heater upper hose of the heater core are provided. 1. An air bleed structure for an engine cooling water circulation system, characterized in that a communication pipe is provided for communicating with the engine cooling water circulation system, and an air bleed part is provided in the communication pipe.