JPS5930724Y2 - car heater device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a car heater device, and particularly relates to measures for improving heating performance when cooling water is low.

Vehicles equipped with an engine are equipped with a car heater device that circulates a portion of engine cooling water through a heater core, exchanges heat with the cooling water flowing through the heater core, and blows warmed air into the vehicle interior for heating. There is.

By the way, the engine cooling water temperature is closely related to the outside air temperature under engine operating conditions that do not reach the valve opening temperature of the thermostat installed in the cooling water passage, and when the outside air temperature is extremely low, the cooling water temperature will decrease. The air temperature does not rise, and the temperature of the air blown from the car heater device also becomes low, resulting in insufficient heating.

For example, in trucks, etc., people take a nap by turning on the car heater while the engine is idling, but when the outside temperature is 20°C, the cooling water temperature only rises to about 40°C. Since the temperature of the air blown out from the car heater device only rises to about 27 to 28° C., it is difficult to heat the vehicle interior to a comfortable temperature.

Further, even when heating is performed before driving, when the temperature is cold, the rise in the temperature of the blown air is delayed in proportion to the completion of warm-up, so there is a problem that the start-up heating characteristics deteriorate.

The present invention was developed in view of the conventional situation, and has a configuration that recovers the heat radiated from the engine or its connected body to warm the air blown by the car heater device, so that heating performance can be obtained even in cold weather. A car heater device is provided.

The present invention will be described in detail below based on illustrated embodiments.

In FIGS. 1 and 2 showing one embodiment, a part of the collection part of an exhaust manifold 21 connected to the engine body 1 is hermetically covered with a cover 22, and outside air is passed through the space inside the cover 22. Then, a heating air blowing passage 23 is provided which leads to the air intake port of the heater core of the car heater 8.

Further, as shown in FIG. 2, a heating air inlet of the cover 22 is provided with a valve 25 that can freely open and close the inlet, and a heating air outlet 22 is also provided at the heating air outlet of the cover 22.
A is opened, and a heating air blowing passage 23 on the downstream side is connected to the heating air outlet 22a and the heater core of the car heater 8.
A valve 26 is provided to selectively open the valve.

With this configuration, when the valves 25 and 26 are in the solid line position in FIG. 2, the exhaust heat released from the outer wall of the exhaust manifold 21 is recovered in the space inside the cover 22, and the preheated air is used as heating air. Car heater 8 via passage 23
Since the air is guided to the air intake port of the car heater 8, the temperature of the air blown from the car heater 8 is increased, and the heating performance can be improved.

Further, when the exhaust manifold 21 is heated and the heat supply to the car heater 8 is excessive, the valve 25 is opened, the valve 26 is set to the chain line position in FIG. 2, and the warm air blowing passage 23 is closed. When the heating air passage outlet 22a is switched to open, heating of the exhaust manifold 21 by the blown air can be prevented while suppressing excessive heating.

On the other hand, when the exhaust brake is activated, that is, when the fuel supply is stopped and combustion is not taking place, the cover 22 is closed by closing only the valve 25 from the above state.
It is possible to keep the internal air warm by blocking the air blowing into the interior, thereby preventing a drop in the temperature of the air blown from the car heater 8, and maintaining a comfortable heating performance.

In this way, the heating air blowing passage 23 including the cover 22 functions as a "gas heater" and an "exhaust manifold cooler".
It has two functions.

The valves 25 and 26 may be operated automatically by an actuator by sensing the temperature inside the warm air blowing passage 23 or the cover 22, or may be operated manually.

A part of the exhaust passage may be formed into an expanded shape, and an air supply pipe to the car heater may be passed through the internal space of the expanded molded part.

In addition, as shown by the chain line in FIG. 1, bypass air passages 24 that bypass the space inside the cover 22 are connected in parallel, and when the outside air or cooling water temperature is below a predetermined value (for example, the valve opening temperature of the thermostat 3), the inside of the cover 22 is A configuration in which the bypass air passage 24 is selectively opened when the space exceeds a predetermined value may be used in combination to suppress an excessive rise in heating temperature.

A similar function can be obtained by providing a bypass exhaust passage that bypasses the space inside the cover 22 on the exhaust passage side and selectively opening it.

As explained above, according to the present invention, the exhaust manifold of the engine is covered with a cover, and the air that has been preheated through the space inside the cover is further warmed through the heater core. The temperature of the air blown out from the car heater can be obtained, comfortable heating can be performed, and the heating performance is also excellent.

Further, by using the valves provided at the inlet and outlet portions of the cover and the heating air outlet, it is possible to prevent a drop in the car heater blowout temperature during the exhaust operation, and also to prevent the exhaust manifold from overheating.

In addition, since the configuration is simple, it has the advantage that it can be implemented at low cost.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic configuration diagram showing one embodiment of the present invention;
The figure is a sectional view of a main part of the same embodiment. 1...Engine body, 8...Car heater, 21...Exhaust manifold, 22...
...Cover, 22a... Heating air outlet, 23
・・・・・・Heating air ventilation passage, 25.26・・・・・・
·valve.

Claims (1)

[Scope of utility model registration request] In a car heater device that heats the vehicle interior by exchanging heat with engine cooling water flowing through the heater core of the car heater, a part of the exhaust manifold connected to the engine body is covered with a cover and inside the cover. A heating air blowing passage passing through the space and the heater core in sequence is provided, and a heating air inlet of the cover is provided with a valve that can freely open and close the inlet, and a heating air outlet is also provided at the heating air outlet of the cover. A car heater device characterized by being provided with a valve that opens and selectively opens the heating air outlet and a passage leading to a heater core.