JPS5810247B2 - Automotive heating system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating device for an automobile, and more particularly to a heating device that recovers exhaust heat from an engine and transmits nuclear heat to a heater core via a heat medium.

Generally, as shown in FIG. 1, a heating system for an automobile supplies a portion of the cooling water of an engine 1 (hot water warmed by the engine) through a pipe 2 to a heater core provided downstream of a fan 4 in a heater unit 3. 5, outside air A absorbed by the fan 4 is heated by heat exchange with the heater core 5, and hot air B is blown into the passenger compartment. The applicant of the present application has proposed a combination of a so-called heat storage heater that recovers and stores exhaust heat in the interior and uses this stored heat to perform heating after the vehicle has stopped (Utility Model Application Publication No. 56-77416). ) That is, a heat storage device 7 is attached to a part of the exhaust pipe 6, and this heat storage device 7
By disposing a pipe line 9 branched from the pipe line 2 through a switching valve 8, the pipe line 9 on the heat storage T side is closed by the switching valve 8 during engine operation, and exhaust heat is stored. When the engine is stopped, the switching valve 8 forms a hot water circulation circuit between the heater core 5 and the heat storage device 7, and the heat stored in the heat storage device 7 is transferred to the heater core 5. Even after the train stopped, the cabin was heated to ensure continued operation.

However, even with such a heat storage heater, the exhaust heat can only be used for heating after the engine has stopped, such as when the coolant temperature is low immediately after the engine is started, during idling, or in the middle of winter. Even if the cooling water temperature alone was insufficient for heating, the exhaust heat immediately after startup could not be used, and a sufficient heating effect could not be obtained.

The present invention has been made in view of the above circumstances, and includes a heat exchanger that can directly exchange exhaust heat with a heat medium in addition to a heat storage device, and also includes a heat exchanger that enables direct heat exchange between the heat storage device and the heat exchanger. By installing a switching valve that selects the higher temperature heat medium from the heater core and supplies it to the heater core, the exhaust gas can be controlled even during operation, including immediately after engine startup, or after the engine has stopped. To provide a heating device that can utilize heat effectively.

The present invention will be explained below based on an embodiment shown in FIG.

However, in FIG. 2, the same parts as in FIG. 1 showing the conventional example are given the same reference numerals to simplify the explanation.

Referring to FIG. 2, a heat storage device 7 is attached to a part of the exhaust pipe 6 of the engine 1 so as to surround it.

This heat storage device 7 includes an inner heat storage container 7a and an outer heat medium container 7b, and has a heat storage container T in contact with the outer peripheral wall of the exhaust pipe 6.
For example, lithium fluoride, lithium hydroxide, etc. are sealed in the heat storage body a, and engine cooling water as a heat medium can flow through the heat medium container 7b.

Further, a heat exchanger 10 is installed in the exhaust pipe 6 upstream from the installation position of the heat storage device 7.

Engine cooling water as a heat medium can flow inside the heat exchanger 10.

Here, the heater core 5 in the cooling water pipe 2 between the engine (its water jacket) 1 and the heater core 5 is
Branch the return side from the pump 11 and connect it to the suction port of the pump 11.
Pipe lines 12 and 13 connected to the discharge port of this pump 11 are connected to respective inlets of the heat storage device 7 and the heat exchanger 10.

Pipes 14 and 15 connected to the respective outlet ports of the heat storage device 7 and the heat exchanger 10 are connected to the middle of the pipe 2 on the inflow side to the heater core 5 via the switching valve 16.

This switching valve 16 has two valve bodies 16a and 16b that interlock so that when one opens, the other closes, and senses the heat medium temperature Ta on the heat storage device 7 side and the heat medium temperature Tb on the heat exchanger 10 side. Then, when Ta>Tb, the valve body 16a is opened to connect the pipe 14 on the heat storage 7 side to the pipe 2, and when Ta≦Tb, the valve body 16b is opened to connect the pipe on the heat exchanger 10 side. The conduit 15 is configured to communicate with the conduit 2 .

Note that 17 is a one-way valve installed on the side of the pipe line 2 facing the heater core 5 and upstream from the confluence position of the pipe lines 14 and 15.

Next, the effect will be explained.

Cooling water as a heat medium is sent to the heat storage device 7 and the heat exchanger 10 by the pump 11, and then passes through the valve bodies 16a and 16b of the exchange valve 16, respectively, and is sent from the pipe line 2 to the heater core 5. , the valve bodies 16a and 16b of the switching valve 16 are opened and closed depending on the temperature of the heat medium (cooling water temperature) on the outflow side of the heat storage device 7 and the heat exchanger 10, and hot water is discharged from either the heat storage device 7 or the heat exchanger 10. It is sent to the heater core 5.

For example, when the cooling water temperature Ta on the outflow side of the heat storage device 7 is low and the cooling water temperature Tb on the outflow side of the heat exchanger 10 is high (when Ta>Tb), such as immediately after the engine starts, the switching valve At 16, the valve body 16a is closed, the valve body 16b is opened, and cooling water (hot water) is supplied to the heater core 5 from the heat exchanger 10 side.

Further, when the temperature of the cooling water of the engine 1 is low, such as immediately after the engine is started, a well-known thermostat (not shown) is closed, so that cooling water is not supplied to the heater core 5 from the engine 1 side.

Therefore, immediately after starting the engine, only hot water heated by exchanging heat with exhaust heat in the heat exchanger 10 is supplied to the heater core 5.

That is, the temperature of the exhaust gas rises quickly after the engine starts, and the heat capacity of the heat exchanger 10 is the same as that of the engine 1.
Since the exhaust heat is very small compared to the heat exchanger 10 and the heat storage device 7, the exhaust heat is recovered by the heat exchanger 10 and transmitted to the heater core 5, thereby making it possible to sufficiently heat the interior of the vehicle.

In addition, as time passes, exhaust heat is stored in the heat storage device 7, and the temperature Ta of the cooling water on the outflow side also increases. The cooling water temperature Tb on the outflow side of the heat exchanger 10 is also sufficiently high except when the exhaust gas temperature is particularly low, such as during idling.

Therefore, in the switching valve 16, the valve body 16a closes and the valve body 16b continues to open, and hot water from the engine 1 due to the opening of the thermostat and hot water heated by the heat exchanger 10 are supplied to the heater core 5. Heating is performed, and the heat storage device 7 is maintained at a high temperature without radiating heat.

Furthermore, when the engine 1 is stopped, or when the cooling water temperature Tb on the outflow side of the heat exchanger 10 decreases especially during idling as described above, the cooling water temperature Ta on the outflow side of the heat storage device 7 decreases. It gets expensive.

Then, in the switching valve 16, the valve body 16a opens, while the valve body 16b closes.

Therefore, at this time, the hot water exchanged with the heat stored in the heat storage device 7 is supplied to the heater core 5, and the interior of the vehicle can be sufficiently heated at this time as well.

FIG. 3 shows a specific example of the switching valve 16.

This switching valve 16 includes a temperature-sensitive bellows 21a as a temperature-sensitive member disposed in a pipe line 14 from the heat storage device 7, and a temperature-sensitive bellows 21a as a temperature-sensitive member disposed in a pipe line 15 from the heat exchanger 10. and a temperature-sensitive bellows 21b are connected by a rod 22, and valve bodies 16a and 16b for opening and closing the pipes 14 and 15, respectively, are fixed to the rod 22.

In this way, the heat medium temperature Ta on the heat storage γ side is sensed by one temperature-sensitive bellows 21a, and the heat medium temperature Tb on the heat exchanger 10 side is sensed by the other temperature-sensitive bellows 21b, and the temperature is proportional to each temperature. Valve body 1 due to the difference in operating force (expansion force)
6a and 16b are operated.

That is, when the heat medium temperature Tb on the heat exchanger 10 side is higher than or equal to the heat medium temperature Ta on the heat storage device 7 side, the expansion force of the temperature-sensitive bellows 21b is made larger than the expansion force of the temperature-sensitive bellows 21a. By setting, in this case, the rod 22 moves to the right in the figure, only the valve body 16b opens, and only the heat medium from the heat exchanger 10 is supplied.

Further, when the heat medium temperature Ta on the heat storage device 7 side is higher than the heat medium temperature Tb on the heat exchanger 10 side, the expansion force of the temperature-sensitive bellows 21a becomes large, and the rod 22 moves to the left in the figure. Only the valve body 16a opens, and only the heat medium from the heat storage device 7 is supplied.

In this way, the pipe line 14.1 on the side of the heat storage device 7 and the heat exchanger 10
Connecting the temperature-sensitive bellows 21a and 21b arranged in 6,
A valve that is operated by a difference in actuation force proportional to each sensed temperature can have an extremely simple structure and be highly reliable.

Note that wax pellets or the like may be used as the temperature-sensitive member instead of the temperature-sensitive bellows.

In the above embodiment, the heat medium that transfers heat from the heat storage device 7 and the heat exchanger 10 to the heater core 5 is the same as the heat medium that transfers heat from the engine 1 to the heater core 5, that is, the cooling water, but a different heat medium may be used. In addition to hot water, steam, alcohol, Freon, etc. can be used as the heat medium.

As explained above, according to the present invention, when the heat medium temperature on the heat storage side is low, such as when starting the engine, only the heat medium from the heat exchanger is supplied to the heater core, so heating can be performed rapidly. In addition, when the heat medium temperature on the heat exchanger side is low, such as when the engine is stopped, only the heat medium from the heat storage device is supplied to the heater core, so sufficient heating can be performed even after the engine has stopped, and the exhaust gas from the engine Heat can be used effectively and it is suitable as an auxiliary heating device.

[Brief explanation of drawings]

Figure 1 is a system diagram showing a conventional example of a heating system for automobiles;
The figure is a system diagram showing one embodiment of the present invention, and FIG. 3 is a sectional view showing a specific example of the switching valve in the same embodiment. 1...Engine, 5...Heater core,
6... Exhaust pipe, 7... Heat storage device, 10...
...Heat exchanger, 16...Switching valve, 21a
, 21b... Temperature-sensitive bellows, 22...
rod.

Claims (1)

[Claims] 1. In an automobile heating device that heats a passenger compartment by recovering engine exhaust heat and transmitting nuclear heat to a heater core via a heat medium, the heating device is attached to an engine exhaust pipe and recovers exhaust heat. A heat exchanger that stores the stored heat in a heat storage body and can exchange heat with a heat medium, and a heat exchanger that is attached to an exhaust pipe and allows exhaust heat to be directly exchanged with a heat medium. an exchanger; and a switching valve that is interposed in a passage that supplies the heat medium from the heat storage device and the heat exchanger to the heater core and operates to select a high temperature side heat medium and supply it to the heater core. A heating device for an automobile, characterized in that: 2. The switching valve connects the temperature-sensitive members disposed in the heat medium passages from the heat storage device and the heat exchanger, and is operated by this connection body based on the difference in operating force depending on the temperature of each. An automobile heating device according to claim 1, characterized in that the heating device is configured as follows.