JPH045689Y2 - - Google Patents

Description

[Detailed description of the invention] "Technical field of the invention" This invention relates to a cooling device for an automobile engine.
In particular, the present invention relates to a cooling device that has a simplified structure and improved heater effectiveness.

"Prior Art and its Problems" Regarding a conventional cooling device for an automobile engine, for example, a cooling system circuit for a water-cooled engine described in Japanese Utility Model Publication No. 52-37731 is known.

This cooling system circuit is extremely common; a thermostat (thermostat valve 2) is installed in the path of the cooling water flowing out from the engine, and when the temperature of the cooling water is high, most of the cooling water flows out to the radiator. After cooling, the cooling water is flowed into the engine again by the cooling water pump, and when the temperature of the cooling water is low, the amount of cooling water directed to the radiator is restricted by a bypass equipped with a thermostat (thermostat valve 9). The water is sent to the cooling water pump via a water channel.

In this way, when the coolant temperature is low (when the engine is cold), the coolant bypasses the radiator and returns to the engine, quickly raising the coolant temperature to an appropriate temperature and reducing the exhaust concentration. Efforts are being made to maintain the engine in optimal operating condition through improvements and other measures.

Further, a heater and a heater bypass for use when the heater is not in use are installed in parallel in the bypass waterway, and a part of the heat of the coolant heated by the heater is released to heat the interior of the vehicle. ing.

However, in the conventional cooling system circuit as described above, when the engine is cold, the thermostat (thermostat valve 9) is opened and the bypass waterway is opened, forming a detour for the heater. be done. Therefore, sufficient cooling water does not flow into the heater against the driver's will.
Most of the cooling water ends up flowing back to the engine via the bypass waterway, which has the drawback of making the heater less effective and not providing optimal heating.

``Purpose of the invention'' The purpose of this invention is to solve the problems caused by the presence of the bypass waterway as described above, namely, the insufficient effectiveness of the heater, and to improve the problem so that optimal heating can be performed. be.

``Structure of the invention'' The main means adopted by the invention in order to achieve the above object is to bypass the radiator and return the cooling water to the engine by bypassing the passageway for the heated cooling water flowing out of the engine. A first thermostat that closes the waterway when the temperature is low and a second thermostat that closes the waterway when the temperature is high are set so that the opening and closing timings of both thermostats are both open, and the first thermostat is connected to the radiator. At the same time, the second water channel connected to the heater is directly connected to the second thermostat, and when the first thermostat is fully closed, the entire amount of water flows out to the second water channel. The point is that when the second thermostat is fully closed, the entire amount of water flows out into the first water channel.

The first and second thermostats in the above components may be a single thermostat with two internal valves, such as a thermostat with a bottom bypass, or two separate thermostats may be used. It may also be configured with a thermostat.

"Embodiments" Next, embodiments embodying the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. 1 and 2 are schematic piping circuit diagrams showing engine cooling systems according to first and second embodiments of the present invention, respectively.

In FIG. 1 showing the first embodiment, 1 is an engine, 3 is a radiator, 4 is a cooling water pump, and 5 is a heater.

In the device shown in the figure, a bottom bypass thermostat 8 is disposed in the cooling water discharge passage from the engine 1, and the bottom bypass thermostat 8 serves as both the first and second thermostats. A first water channel 6 connected to the radiator 3 is connected to the drain port of the bottom bypass thermostat 8 on the side that opens when the cooling water is at high temperature.
Further, a second water channel 7 connected to the heater 5 is connected to the discharge port side that is opened when the cooling water is low temperature.

The bottom bypass thermostat shown in the figure is an example of a wax type thermostat, in which a wax body 10 into which a spindle 9 is inserted moves up and down by utilizing the thermal expansion of the wax, and this causes the first water channel 6 to move up and down. When the connected valve 11 opens or closes, the valve 12 attached to the lower end of the wax body 10 closes or opens in the opposite direction to the valve 11. Therefore, by adjusting the opening/closing timing of the valves 11 and 12 to suit the appropriate temperature, both valves 11
and 12 can be configured so that both are open to some extent in a certain temperature range, and in a temperature range higher than that temperature range, valve 12 is closed and valve 11 is opened, and in a temperature range lower than that temperature range, valve 12 is closed and valve 11 is opened. In this case, the valve 12 is opened and the valve 11 is closed. This makes it possible to adjust the amount of cooling water flowing into the heater 5 as appropriate by changing the ratio of opening and closing times of each valve between summer and winter, thereby making it possible to perform optimal heating control.
If the rate of cooling water flowing into the heater 5 as described above is controlled by, for example, fixing the valve 11 and changing the opening/closing characteristics of the valve 12, optimal heating can be achieved without controlling the heater.

Therefore, in this embodiment, when the valve 11 is completely closed because the temperature of the cooling water is low as in the cold state, the valve 12 is open, and all the cooling water passes through the second water channel 7 to the heater. Sent to 5,
After releasing the heat, it is returned to the engine 1.

As a result, the temperature of the cooling water passing through the engine 1 rises rapidly, and the effectiveness of the heater 5 is improved.

In this device, the second water channel 7 also serves as a conventional bypass water channel, so that the device can be simplified.

Conversely, when the temperature of the cooling water rises above a certain temperature range, the valve 12 is completely closed, and since the valve 11 is open at this time, the entire amount of cooling water is sent to the radiator 3 through the second water channel 6. the result,
The responsiveness of the temperature control of the engine 1 is significantly improved, and the cooling performance is improved.

Mechanisms that can alternately bring the first water channel and the second water channel into a completely closed state include not only the device shown in FIG. 1 above, but also the device shown in FIG. 2. It is also possible by applying

That is, in the second embodiment shown in FIG. 2, compared to the example shown in FIG. 7 is interposed, and the opening/closing characteristics of this thermostat 13 are opposite to those of thermostat 2. In a certain temperature range, both thermostats 2 and 13 are closed. A device is used that has a characteristic that it becomes open to a certain extent and becomes fully closed when the temperature rises above that temperature range. If such a wrap area is not provided, the cooling water will not flow and the engine 1
This is because heating occurs. Therefore, in this embodiment as well, when the temperature of the cooling water rises above a certain range, the thermostat 13 closes (the thermostat 2 is open), so that no cooling water is sent to the heater 5, and all the cooling water is is sent to the radiator through the first water channel 6 and cooled appropriately, and if the cooling water temperature is lower than a certain range, the thermostat 2 is fully closed (thermostat 13 is open), All the cooling water will be sent to the heater 5 through the second water channel 7.

``Effect of the invention'' As described above, the present invention omitted the bypass waterway that bypasses the radiator and returns the cooling water to the engine, and has a system that closes the waterway at low temperatures in the passageway for heated cooling water flowing out of the engine. The opening/closing timing of the first thermostat and the second thermostat, which closes the water channel when the temperature is high, are set so that both are open, and the first thermostat, which is connected to the radiator, is connected to the first thermostat. At the same time, a second water channel connected to the heater is directly connected to the second thermostat, so that when the first thermostat is fully closed, the entire amount of water flows into the second water channel, and the second thermostat is fully closed. Since this is an engine cooling device in which the entire amount of water flows out into the first waterway when the engine cooling device is closed, the bypass waterway that was conventionally required can be omitted, thereby simplifying the device. Then, it becomes possible to perform optimal heating and improve the effectiveness of the heater, and furthermore, the responsiveness of engine temperature control is significantly improved and cooling performance is also improved.

[Brief explanation of drawings]

1 and 2 are schematic piping circuit diagrams each including an engine cooling device according to an embodiment of the present invention. Explanation of symbols: 1... Engine, 2... First thermostat, 3... Radiator, 4... Cooling water pump, 5... Heater, 6... First water channel, 7...
...Second water channel, 8...Thermostat with bottom bypass, 13...Second thermostat.

Claims (1)

[Scope of utility model registration request] The bypass water passage that bypasses the radiator and returns the cooling water to the engine is omitted.The heated cooling water passage flowing out of the engine is equipped with a first thermostat that closes the water passage when the temperature is low, and a second thermostat that closes the water passage when the temperature is high. The opening and closing times of the thermostats are set so that both are open, the first thermostat is connected to the first waterway connected to the radiator, and the second thermostat is connected to the first waterway connected to the heater. The two water channels are directly connected, so that when the first thermostat is fully closed, the entire amount of water flows into the second water channel, and when the second thermostat is fully closed, the entire amount of water flows into the first water channel. engine cooling system.