JPS5924003B2 - engine cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine cooling system, and more particularly to an improvement in a cooling system that utilizes a portion of the cooling water heated by the engine as a heat source for a heater.

Conventionally, this type of cooling device has generally been constructed as shown in FIG.

That is, for the engine 101, the radiator 102,
A cooling fan 103, a water pump 104, a thermovalve 105, an inflow side cooling water passage 106 that sends cooling water from the radiator 102 into an internal waterway (not shown) of the engine 101 via the water pump 104, and cooling from the engine internal waterway. Outflow side cooling water passage 101 that returns water to the radiator 102 via the thermoha/L/p 105
, and the bypass passage 108 constitute a basic engine cooling system, while a part of the cooling water is supplied to the heater 1 for heating.
10, a heater passage 111 is provided that branches from the engine internal waterway and passes through a heat radiation type heater 110, and the passage 111 is equipped with a valve 112 that can be opened and closed.
The passage 111 passing through the heater 110 merges with the intake passage heating water passage 113 of the engine, and then returns the cooling water to the water pump 104 as it is.

In this structure, in order to enhance the heating effect of the heater 110, it is desirable to make the temperature of the cooling water sent to the heater 110 as high as possible, but this temperature corresponds to the temperature of the cooling water inside the engine. Since the temperature of the cooling water is always limited to a constant condition by the thermostat 105, this also limits the temperature of the cooling water supplied to the heater, which is a major constraint in improving the heating effect.

In view of these circumstances, the present invention provides an engine that can enhance the heating effect of a heater that uses part of the cooling water as a heat source by automatically changing the temperature control conditions of the cooling device when the heater is activated. The purpose of this project is to provide a cooling device.

The present invention is characterized by an inlet cooling water passage that sends cooling water from the radiator into the engine internal waterway, and an outflow cooling water passage that returns the cooling water from the engine internal waterway to the radiator via a thermovalve. , in an engine cooling device comprising a heater passage branching from the engine internal water passage and passing through the heater, the outflow side cooling water passage upstream of the thermovalve and the cooling water passage flowing out from the heater are connected to the cooling water passage upstream of the thermovalve. The reason is that the cooling water and the cooling water flowing out from the heater are arranged so that heat can be exchanged with each other.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows the overall structure of the device of the present invention.

In the figure, 1 is an engine, 2 is a radiator, 3 is a cooling fan, 4 is a water pump, 5 is a thermo valve, and 6
The cooling water from the radiator 2 is passed through the water pump 4 to the internal waterway of the engine 1, that is, the water jacket (
(not shown), I is an outflow cooling water passage that returns the cooling water from the engine internal waterway to the radiator via the thermovalve 5, and 8 is a bypass passage, which provides basic engine cooling. A system is constructed.

The configuration of this basic engine cooling system is the same as that of the conventional one, and a main circulation path is constituted by the radiator 2, the inflow side cooling water passage 6, the engine internal waterway, and the outflow side cooling water passage I, and the water pump 4 When the temperature of the engine 1 is low, the thermovalve 5 closes the cooling water passage γ, and when the engine temperature rises, the thermovalve 5 opens the cooling water passage I to connect the radiator 2 and the engine internal waterway. Cooling water is circulated between them.

The thermovalve 5 automatically controls cooling water based on temperature detection. For example, as shown in FIG. The valve body 52 attached to the valve body 52, the rod 54 which slidably protrudes from the container 51 and whose tip end is held by the holding frame 55, and the spring 56 which biases the valve body 52 toward the valve seat 53, Depending on the temperature of the cooling water around the container 51, when the temperature increases, the rod 54 protrudes due to thermal expansion of the wax, and the container 51 moves to open the valve.

In addition to this, the thermovalve 5 may have any structure used in general water-cooled cooling devices.

Further, the bypass passage 8 is provided between the cooling water passage T near the container 51 of the thermovalve 5 and the water pump 4, and even when the thermovalve 5 is closed, the bypass passage 8 is provided between the periphery of the container 51 and the engine internal waterway. By circulating water between them, the correspondence between the water temperature around the container 51 and the water temperature in the engine internal waterway is maintained.

10 is a heat dissipation type heater for heating, 11 is a heater passage through which cooling water flows to the heater, the heater passage 11 branches from the engine internal waterway, and is operated from the driver's seat etc. in the heater passage 11 upstream of the heater 10. The structure equipped with the valve 12 that can be opened and closed by the heater is the same as that of the conventional device, but the passage downstream of the heater 10 in the heater passage 11 has a cross-shaped structure immediately upstream of the thermovalve 5 of the outflow side cooling water passage I. is inserted into.

A heat exchanger 20 is provided in this heater passage insertion portion.

The heat exchanger 20 includes, for example, a large number of parallel pipes 21 that cross the outflow side cooling water passage T, and these pipes 21 are connected to a cylindrical body that forms a part of the cooling water passage 1. 22, and is interposed in the cooling water passage I by a mounting frame 23 surrounding them.

The inside of each of these pipes 21... is the heater passage 1.
1 and form a part of the heater passage 11, and the outer circumferential surface of each pipe 21... is in contact with the cooling water flowing from the engine internal waterway to the thermovalve 5.

Each pipe 21 is made of a material with high thermal conductivity.

The heater passage 11a that has passed through the heat exchanger 20 is merged with the bypass passage 8 or directly connected to the water pump 4, thereby circulating the cooling water that has passed through the heater 10 and the heat exchanger 20 into the engine internal waterway. That's what I do.

In addition, an intake passage heating water passage 13 that branches off from the engine internal water passage and heats the intake passage is separate from the heater passage 11.
The cooling water is made to flow back to the water pump 4 without merging with the heater passage 11.

The operation of this device will be explained next.

In each figure, the flow of cooling water is indicated by an arrow.

When the engine is operating and the valve 12 of the heater passage 11 is closed and the heater 10 is not operating, the temperature of the cooling water in the engine internal waterway is maintained at a preset constant level by the control action of the thermovalve 5. It is controlled so that it does not exceed the specified value.

At this time, the water temperature in the engine internal waterway and the water temperature around the container 51 of the thermovalve 5 are almost the same, and the control action is performed based on this water temperature.

Next, when the heater 10 is activated, the valve 12 is opened, and the cooling water branched from the engine internal waterway flows into the heater passage 11. When this cooling water passes through the heater 10, heat is radiated and the water is released from the heater 10. On the downstream side, the temperature of the cooling water becomes lower.

This low-temperature cooling water flows to the heat exchanger 20 immediately upstream of the thermovalve 5, and due to the heat exchange action, the mainstream cooling water flowing from the engine internal waterway to the thermovalve 5 is cooled.

Therefore, the temperature of the cooling water when it reaches the temperature sensitive part (container 51) of the thermopulp 5 is lower than the temperature when it flows out from the engine internal waterway by the amount of heat exchanged.

As a result, the opening timing of the thermopulp 5 due to the rise in water temperature inside the engine is delayed compared to normal times (when the heater is not operating), and as a result, the cooling water in the engine internal waterway and the cooling water sent to the heater 10 are reduced. The temperature is maintained at a high temperature, and the degree of this varies depending on the usage state of the heater 10. The larger the amount of heat released by the heater 10, the later the opening timing of the thermovalve 5 is, and the higher the temperature is maintained.

In other words, when the heater is not operating, when the heater is operating, and when the heater 1
By automatically changing the control conditions for the engine internal cooling water depending on the usage level of 0, the amount of cooling sent to the heater 10 when the heater is activated is lower than that of the conventional device shown in Fig. 1 under the same setting conditions. The temperature of the water will be increased and the heating effect will be improved.

In this case, the temperature of the cooling water inside the engine increases to some extent when the heater is activated, but since the heater 10 is activated when it is cold, the problem of engine failure does not occur; At times, the circulation of the cooling water in the heater passage 11 is stopped and the heat exchanger 20 does not work, so that the temperature of the engine is adjusted under normal control conditions.

In the illustrated embodiment, the heater passage 11 and the intake passage heating water passage 13 are separated, but the intake passage heating water passage may be joined to the heater passage and connected to the heat exchanger 20.

However, in this case, the cooling water flowing out from the heater joins the cooling water from the intake passage heating waterway and the temperature rises to some extent, so from the viewpoint of enhancing the heat exchange effect in the heat exchanger 20, The illustrated embodiment is preferred.

Further, the specific structure of the portion that performs heat exchange is not limited to the above embodiments. For example, the passage of the cooling water flowing out from the heater 10 may be arranged along the outflow side cooling water passage 1 upstream of the thermopulp 5, or the passage of the cooling water flowing out from the heater 10 may be Any structure suitable for providing a heat exchange effect between the cooling water flowing out from the heater 10 and the cooling water sent to the thermopulp 5, such as surrounding the heater 10 and enabling appropriate heat exchange between them. can be adopted.

As explained above, the present invention provides a cooling device equipped with a heater passage that uses part of the cooling water heated by the engine as a heat source for a radiation type heater. The cooling water passage upstream of the thermo valve in the engine cooling system is arranged so that the cooling water upstream of the thermo valve and the cooling water flowing out from the heater can exchange heat, so when the heater is activated, the heat of the heat exchanger is Based on the exchange action, the temperature of the cooling water flowing from the engine internal waterway to the heater can be maintained at a high temperature, and the heating effect of the heater can be significantly improved compared to conventional devices of this type.

[Brief explanation of the drawing]

FIG. 1 is a structural explanatory diagram of a conventional cooling device equipped with a heater passage, and FIG. 2 is a structural explanatory diagram showing an embodiment of the present invention device.
Figure 3 is an enlarged cross-sectional view of the heat exchanger installation part of the device, Figure 4 is a cross-sectional view taken along line ■-■ in Figure 3, and Figure 5 is a cross-sectional view taken along line v-V in Figure 3. FIG. 1...Engine, 2...Radiator,
5... Thermopulp, 6... Inflow side cooling water passage, γ... Outflow side cooling water passage, 10...
...Scolding, 11...Scolding, Evening Passage, 20...
···Heat exchanger.

Claims (1)

[Claims] 1. An inflow cooling water passage that sends cooling water from the radiator into the engine internal waterway, an outflow cooling water passage that returns the cooling water from the engine internal waterway to the radiator via a thermovalve, and an outflow cooling water passage that branches from the engine internal waterway. In an engine cooling system, the outflow side cooling water passage upstream of the thermovalve and the cooling water passage flowing out from the heater are connected to the cooling water upstream of the thermopulp and the cooling water passage flowing out from the heater. An engine cooling device characterized by being arranged to enable heat exchange with water.