JPH0345039Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an air vent plug provided in a radiator incorporated in a cooling device for an internal combustion engine.

Background of the invention Some radiators used in internal combustion engine cooling systems do not have a cooling water inlet at the top of the cooling water tank, but have an air vent plug on the side wall of the cooling water tank. It is preferable that the air vent plug be provided at the top of the side wall to vent air from the radiator, but in many cases it is not installed at the top due to the structure, installation, and strength of the cooling water tank. Not provided. For this reason, conventionally,
The air bleed plug provided on the side wall of the cooling water tank has the disadvantage that air from the radiator cannot be completely vented.

Purpose of the invention The purpose of the invention is to provide an air bleed plug installed on the side wall of the cooling water tank of a radiator, which is improved so as to bleed air from the radiator more reliably than conventional ones. There is.

According to the present invention, the above purpose is to provide an extension pipe at a position different from a cooling water inlet for injecting cooling water into the radiator, and to provide a port opened in the radiator cooling water tank. Connect the lower end to the port and extend the inside of the radiator cooling water tank upwards from the port. An air intake port is formed at the upper end of the extension pipe and opens near the top of the radiator cooling water tank, and the extension pipe has an L-shape.
This is also achieved by an air vent plug characterized by opening and closing a port opened in the radiator cooling water tank and providing a valve element that communicates and shuts off communication between the inside of the radiator cooling water tank and the outside of the radiator cooling water tank. be done.

Effects of the invention According to the configuration of the air vent plug as described above, when cooling water is injected from the water inlet, the valve element is opened, the port opening into the cooling water tank is opened,
The differential pressure between the air in the tank and the atmospheric pressure is set to 0 to improve water injection performance. At this time, cooling water flows from the water inlet,
The cooling water pipes pass through the pipes and the radiator is filled with water while removing the air that inevitably accumulates inside the pipes and the radiator. Then, the air inside the pipes and the radiator gathers in the radiator cooling water tank, and this air passes through the extension pipe and is discharged to the outside. In other words, air accumulates in the upper part of the tank, but since the air intake port opens near the top of the tank, the accumulated air can be effectively discharged to the outside.

When the radiator cooling water tank is completely filled with water, the cooling water flows out from the port. This allows the user to visually confirm that the air in the radiator cooling water tank has been removed and that the tank is completely filled with water. Then, by closing the port with the valve element,
Water injection work can be performed reliably.

Further, since the extension pipe has an L-shape, the extension pipe is connected to an open port formed in the side wall of the tank at a position below the top. Therefore, the lower end of the extension pipe can be installed at a position below the upper part of the tank, rather than at the top, which allows flexibility in installation and is extremely effective in dealing with space constraints. be.

Furthermore, although the upper part of the tank is inferior in strength, the extension pipe can be attached without any problem in terms of strength because it is attached at a position below the upper part.

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail with reference to embodiments with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a radiator equipped with an air bleed plug according to the present invention, and FIG. 2 shows the air bleed plug according to the present invention partially in section. In the figure, 1 indicates a radiator, which is a cross-flow type, and has two vertically long side tanks (cooling water tanks) 2 and 3.
, a plurality of cooling water tubes 4 extending horizontally between the two side tanks and connecting them to each other, and a heat dissipation fin 5 attached to the outer periphery of the cooling water tube. . There is a cooling water inlet port 6 at the top of the side wall of the side tank 2.
However, cooling water outlet ports 7 are provided at the lower portions of the side walls of the side tanks 3, respectively.

An air vent plug 8 is provided at the upper part of the side wall of the side tank 3. The air vent plug 8 has a plug housing 9 fixed to the side wall of the side tank 3 by penetrating the side wall. The plug housing 9 has a valve chamber 12 that communicates with a port 10 that opens into the side tank 3 at one end and communicates with a port 11 that opens outside the side tank 3 at the other end.
, and a manual valve element 13 is screwed into the valve chamber. When the valve element 13 is rotated, it moves in the axial direction of the plug housing 9 by means of a screw action, thereby selectively communicating or blocking the ports 10 and 11.

One end of an elbow-shaped extension pipe 14 is connected to the port 10 of the plug housing 9 in communication. The extension pipe 14 extends upward from the port 10 into the side tank 3 and has an air intake port 15 at its upper end. Thus, the plug housing 9 and the elbow-shaped extension pipe 14 open the external port 1 to the outside of the side wall of the tank 3.
A conduit structure is constructed which provides an L-shaped passage as a whole from 0 to an internal port 15 which is located in the side wall of the tank 3 and opens at a higher position than the port 10.

If the air vent plug 8 is attached to the side tank 3 as shown in FIG. 2 and the extension pipe 14 is not provided, the water level of the cooling water in the side tank 3 will be as shown in FIG. When the water level shown by the symbol A is exceeded, the cooling water in the side tank 3 overflows to the outside from the port 11, so in this case, the air above the water level A is not vented.
Although cooling water does not flow into the cooling water tube 4 located above the water level A and does not function effectively, if an extension pipe 14 is provided like the air vent plug according to the present invention, the air intake port of the extension pipe The air is vented to the water level B corresponding to the height position 15, and the air intake port 15 is located near the top of the side tank 3 and above the top cooling water tube 4, as shown in the figure. As a result, cooling water can flow to all of the cooling water tubes 4 of the radiator 1, and even if the air vent plug is installed at a lower position than the highest cooling tube 4, all of the cooling water tubes 4 can dissipate heat from the cooling water. It comes to work effectively.

Although the present invention has been described above in detail with respect to specific embodiments, it is understood that the present invention is not limited to these and that various embodiments are possible within the scope of the present invention. This will probably be obvious depending on the manufacturer.

[Brief explanation of the drawing]

Figure 1 is a front view showing a cross-flow type radiator equipped with an air vent plug according to the present invention;
The figure is a partially sectional side view of one embodiment of the air vent plug according to the present invention. 1...Radiator, 2,3...Side tank,
4...Cooling water tube, 5...Radiation fin, 6...
...Cooling water inlet port, 7...Cooling water outlet port, 8...Air vent plug, 9...Plug housing, 10, 11...Port, 12...
...valve chamber, 13...valve element, 14...extension pipe,
15...Air intake port.

Claims (1)

[Claims for Utility Model Registration] Provided on the side wall of the radiator cooling water tank, communicates with and shuts off the inside of the radiator cooling water tank and the outside of the radiator cooling water tank, and discharges air mixed inside the radiator to the outside. The air vent plug is provided in a position different from a cooling water inlet for injecting cooling water into the radiator, and a lower end thereof is connected to a port opened in the radiator cooling water tank, and the lower end is connected to a port opening in the radiator cooling water tank. an L-shaped extension pipe that extends upward from the port inside the water tank and has an air intake port at its upper end that opens near the top of the radiator cooling water tank; An air vent plug comprising: a valve element that opens and closes a port opened in a radiator cooling water tank, and communicates and shuts off communication between the inside of the radiator cooling water tank and the outside of the radiator cooling water tank.