JPH0221557Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a reserve tank type radiator for a gasoline or diesel engine.

A reserve tank type radiator is a type of radiator in which when the temperature of the coolant in the radiator increases and its pressure increases, the coolant overflows and escapes to the reserve tank, and returns to the original radiator when the coolant temperature drops. This has the advantage of not requiring refilling of cooling water.

FIG. 1 shows the structure of the upper tank portion of such a reserve tank type radiator, and this structure controls the pressure of the radiator or the temperature of the cooling water. In the figure,
1 is a radiator cap, 2 is a rubber gasket, 3 is a pressure valve, 4 is a pressure spring, 5 is a vent valve, 6 is a vent valve spring, 7 is an overflow pipe, 8 is a reserve tank, 9 is a steam/water separation plate, 10 is the air-water separation chamber,
11 indicates an inlet pipe.

While the engine is stopped, the valves 3 and 5 are brought into close contact with their respective valve seats by the springs 4 and 6 to maintain airtightness within the radiator. When the engine runs, the temperature of the coolant increases,
When the pressure reaches a specified value, for example, a gauge pressure of 0.5 kg/cm ² or more, the pressure valve 3 is pushed up against the pressure spring 4 and opened, and the high temperature cooling water flows through the overflow pipe 7 to the reserve tank 8. run away to When the engine stops and the coolant temperature in the radiator drops, the vent valve 5 is pushed down against the vent valve spring 6 and opened by the negative pressure in the radiator, and the coolant in the reserve tank 8 flows into the overflow pipe. 7 and returned to the radiator.

The air-water separation chamber 10 stores cooling water mixed with air bubbles, and when the pressure valve 3 opens, it flows into the reserve tank 8, from which the air bubbles are released to the atmosphere to perform air-water separation. It is. This is because air bubbles mixed in the cooling water not only reduce the performance of the radiator but also cause cavitation corrosion.

The purpose of this invention is to dramatically improve the steam/water separation performance of such a reserve tank type radiator.

The reserve tank type radiator based on this invention has a vent valve on the radiator cap that
The upper and lower sides are supported by two different springs, and the lower spring has the property of increasing its length as the temperature rises.

An embodiment of this invention will be described below with reference to FIG. 2. Since the structure is the same as that in FIG. 1 except for the vent valve spring, the same members are given the same reference numerals. The vent valve 5 has a first spring 6a installed between the lower surface side of the flange 5a of the shaft portion and the pressure valve 3, and a first spring 6a installed between the upper surface side of the flange 5a and the lower surface of the radiator cap 1. It is supported by the radiator cap 1 by two springs 6b.

When the temperature is lower than the set temperature, the second spring 6a presses the flange 5a toward the first spring 6a to keep the vent valve 5 open together with the first spring 6a, and when the temperature is higher than the set temperature, the first spring The vent valve 5 is compressed by the expansion of the spring 6a, and holds the vent valve 5 in a closed state together with the first spring 6a. Here, the first spring 6a is formed of a titanium alloy or a bimetallic alloy whose length becomes longer when the temperature exceeds a certain temperature, for example 90°C. It is made from a shape memory alloy such as nickel alloy.

First spring 6a and second spring 6b
is balanced with the vent valve 5 open when the cooling water temperature is below 90°C, and when the cooling water temperature exceeds 90°C, the first spring 6 opens as shown in Figure 3.
a extends against the second spring 6b, and the vent valve 5 is closed. Therefore,
During normal operation when the cooling water temperature is below 90°C, the vent valve 5 is always open, and when the pressure inside the upper tank increases or decreases due to fluctuations in engine rotation, the air-water separation chamber 10 (see Figure 1) is opened accordingly. Since the cooling water mixed with air bubbles in the reservoir tank 8 breathes with the cooling water in the reserve tank 8, the air bubbles are released from the reserve tank 8 to the atmosphere, and air and water separation is effectively performed.

On the other hand, when the cooling water temperature exceeds 90° C., the first spring 6a expands and closes the vent valve 5, so that it functions in the same way as a conventional vent valve. That is, since the temperature of the cooling water has risen and the internal pressure of the radiator has become high, the pressure valve 3 is opened and the high temperature cooling water flows into the reserve tank through the overflow pipe 7 to prevent overheating. When the cooling water temperature drops to 90° C. or lower, the first spring 6a contracts again and opens the vent valve 5 to allow communication between the radiator and the reserve tank.

As mentioned above, in the reserve tank type radiator according to this invention, the vent valve of the radiator cap is supported at the lower part of the flange by a spring whose length increases as the temperature rises, so The radiator and the reserve tank are in communication with each other, promoting the release of the bubble-containing cooling water to the atmosphere, and dramatically improving the steam-water separation of the cooling water. On the other hand, when the temperature of the cooling water exceeds the set temperature, it acts like a normal vent valve.
The advantages of a reserve tank type radiator can be maintained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the upper tank portion of a conventional reserve tank type radiator, Fig. 2 is a sectional view showing only the main parts of an embodiment of this invention, and Fig. 3 is an implementation of the embodiment shown in Fig. 2. It is an explanatory diagram of an example of an operation. 1... Radiator cap, 2... Rubber gasket, 3... Pressure valve, 4... Pressure spring, 5... Vent valve, 6... Vent valve spring, 7... Overflow pipe, 8... Reserve tank, 9 ...Air-water separation plate,
10... Steam/water separation chamber, 11... Inlet pipe.

Claims (1)

[Scope of utility model registration request] A pressure valve that is slidably provided on the radiator cap and opens and closes an opening in the upper part of the upper tank of the radiator, a vent valve that is attached to the pressure valve and opens and closes the opening of the pressure valve, and a reserve tank that communicates with the radiator through the opening. and maintains the internal pressure of the radiator within a set pressure range by cutting off communication between the reserve tank and the radiator,
The vent valve is installed between the lower surface side of the shaft flange and the pressure valve, and has a first spring that extends its entire length when the cooling water in the radiator reaches a set temperature or higher, and the upper surface side of the flange and the radiator cap. The vent valve is supported by the radiator cap by a second spring installed between the vent valve and the lower surface of the vent valve. A reserve tank type radiator characterized in that the first spring extends against the spring force of the second spring to close the vent valve.