JPS6342652Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a heating device that uses exhaust heat to heat the cooling water of an engine mounted on a vehicle such as an automobile by using exhaust gas from the engine when necessary.

[Conventional technology]

Conventionally, as a heating device using exhaust heat as mentioned above, as shown in Japanese Utility Model Application Publication No. 77416/1986, an exhaust system is used in which exhaust gas is passed through a heater circuit through which cooling water flows after cooling the engine only when necessary. It is known to include a heat exchanger and a heater core connected in series with the heat exchanger. However, in conventional heating devices using exhaust heat of this kind, it is difficult to bleed air from the exhaust heat exchanger part of the heater circuit, and a three-way valve is required as a heater valve installed in the heater circuit. There was a problem with the large amount of cooling water being circulated.

[Purpose of invention]

The present invention solves the conventional problems mentioned above, allows air to be easily vented from the exhaust heat exchanger part of the heater circuit, and also allows the heater valve to be of an open/close type, eliminating the need for a three-way valve. The purpose of the present invention is to provide a heating device using exhaust heat that can easily introduce outside air into the vehicle interior without heating the vehicle by simply modifying the electric circuit.

[Structure of the idea]

The present invention provides a heating system using exhaust heat, which includes an exhaust heat exchanger through which exhaust gas is passed only when necessary, and a heater core connected in series with the heat exchanger, in a heater circuit through which cooling water flows after engine cooling. , an open/close type heater valve is provided between the heater core of the heater circuit and the exhaust heat exchanger, and a bypass circuit is provided between the heater valve of the heater circuit and the exhaust heat exchanger when the heater valve is closed, so that the cooling water is bypassed by the engine. It is connected to a circuit.

【Example】

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 is an engine installed in a car, and a cooling water flow path in the engine 1 and a radiator 2 are connected by a radiator forward circuit 3 and a radiator return circuit 4, and a water pump driven by the engine 1. 5, the cooling water passes through the cooling water flow path in the engine 1, cools the engine 1, and is sent from the radiator forwarding circuit 3 to the radiator 2, where it is cooled by exchanging heat with the outside air.
The cooling water is configured to be returned from the radiator return circuit 4 to the cooling water flow path within the engine 1. Also, both ends of an engine bypass circuit 6, through which cooling water flows by bypassing the radiator 2 by the pump 5, are connected to a cooling water passage in the engine 1, and furthermore, an inlet and an outlet of the radiator circuit 3 are connected to the engine and radiator air vents. Filler part 9 in pipes 7 and 8
The intermediate portion of the radiator return circuit 4 is connected to the filler section 9 through a filler conduit 10, thereby forming a conventionally known engine cooling system. The heater circuit 11 through which the coolant after cooling the engine 1 flows has an inlet connected to the coolant flow path in the engine 1 or the inlet of the radiator circuit 3, and is connected in series to the exhaust heat exchanger 12 and the downstream side thereof. A heater core 13 is provided, and a heater circuit 11
The outlet of is connected to the radiator return circuit 4. The exhaust heat exchanger 12 is connected to the exhaust pipe 1 of the engine 1.
A bypass exhaust pipe 15 is provided to surround the exhaust pipe 14 and bypass the exhaust heat exchanger 12 in parallel with the exhaust pipe 14, and an exhaust switching valve is provided at the engine 1 side branch of the exhaust pipe 14 and the bypass exhaust pipe 15. 1
6 is provided, an exhaust pipe 14 and a bypass exhaust pipe 15
The downstream sides of the two converge and are opened to the atmosphere through a muffler. Further, the heater circuit 11 is provided with an open/close type heater valve 17 between the heater core 13 and the exhaust heat exchanger 12, and a bypass circuit when the heater valve 17 is closed between the valve 17 and the exhaust exchanger 12. One end of 18 is connected,
The other end of this bypass circuit 18 is connected to the engine bypass circuit 6. Further, a fan 20 attached to the heater core 13
The fan switch 21 for turning on and off the exhaust switching valve 16 and the heater reinforcement switch 22 for operating the exhaust switching valve 16 are connected to the key switch 19.
are connected in parallel through the heater reinforcement switch 2.
2 is connected in series with a coil of a solenoid valve 24 via a water temperature switch 23. The water temperature switch 23 detects the temperature of the cooling water after cooling the engine 1 at the inlet of the radiator circuit 3 or the engine 1, and is turned off when the temperature of the cooling water is high. On the other hand, the solenoid valve 24 is
It is provided in a pipe 27 that connects the downstream side of the throttle valve of the intake system 25 of the engine 1 and the negative pressure actuator 26 of the exhaust switching valve 16, and is connected to the water temperature switch 2.
When the actuator 2 is turned off, the coil of the solenoid valve 24 is de-energized, closing the conduit 27, and the actuator 2
6, the exhaust switching valve 16 is connected to the exhaust heat exchanger 1.
This is for switching to pass exhaust gas from the exhaust pipe 14 on the second side to the bypass exhaust pipe 15. The exhaust heat utilization heating device of the embodiment configured as described above opens the heater valve 17 and turns on the heater reinforcement switch 22 and the fan switch 21, so that when the cooling water temperature after cooling the engine is less than a predetermined temperature, When the water temperature switch 23 is turned on, the solenoid valve 24 opens the pipe line 27, the negative pressure actuator 26 operates with the intake negative pressure of the engine 1, and the exhaust switching valve 16 opens the exhaust pipe 14. Exhaust gas passes through the exhaust pipe 14. For this reason, the engine 1 passing through the heater circuit 11
After being cooled, the cooling water exchanges heat with the exhaust gas in the exhaust heat exchanger 12 to raise its temperature, and then is guided to the heater core 13, where it is heat exchanged with the air sent into the vehicle interior by the drive of the fan 20, and the temperature of the coolant is increased. Heat the room. The coolant after heat exchange joins the coolant flowing from the heater core 13 through the radiator return circuit 4 and is sent to the coolant flow path in the engine 1. Here, when the cooling water after cooling the engine 1 reaches a predetermined temperature or higher when the car is climbing a slope or driving at high speed, this is detected and the water temperature switch 23 is turned off, the solenoid valve 24 closes the pipe 27, and the actuator 26 is deactivated, the exhaust switching valve 16 is switched, the exhaust pipe 14 is closed, and the exhaust gas passes through the bypass exhaust pipe 15. Therefore, even if the cooling water after cooling the engine 1 passes through the exhaust heat exchanger 12, it is sent to the heater core 13 without being heated, and is heat exchanged with the air sent into the passenger compartment. In addition, by closing the heater valve 17 and turning off the heater reinforcement switch 22 and fan switch 21, the cooling water after cooling the engine 1 is not sent to the heater core 13 of the heater circuit 11 and is passed through the exhaust heat exchanger 12. After passing through the bypass circuit 18 and the engine bypass circuit 6, it is guided to the inlet of the water pump 5 and circulated. Therefore, from the exhaust heat exchanger 12 section to the bypass circuit 1
Air is vented through 8 and the heater valve 17
The structure is simple because it does not require a three-way valve and can be of an open/close type. Furthermore, since the bypass circuit 18 is connected to the engine bypass circuit 6, the amount of circulating water when the heater valve 17 is closed can be reduced, resulting in less loss. Since the heater reinforcement switch 22 and the fan switch 21 are in separate circuits, only the fan switch 21 can be turned on while the heater valve 17 is closed. can be introduced into the vehicle interior without raising the temperature using the heater core 13. Note that although the heater circuit 11 and the engine bypass circuit 6 are always communicated through the bypass circuit 18, there is almost no deterioration in heating performance due to this.

[Effect of the idea]

As explained above, according to the present invention, since the opening/closing type heater valve of the heater circuit and the exhaust heat exchanger are connected to the engine bypass circuit by the bypass circuit, the exhaust heat of the heater circuit is exchanged when the heater valve is closed. By circulating the cooling water from the heater circuit through the bypass circuit and the engine bypass circuit, air can be easily vented from the exhaust heat exchanger section of the heater circuit with a simple configuration, and there is no need to use a three-way valve as the heater valve. Therefore, it is possible to provide a heating device using exhaust heat, which can reduce the amount of circulating water when the heater valve is closed, and can easily introduce outside air into the passenger compartment without heating the vehicle by simply modifying the electric circuit.

[Brief explanation of drawings]

The figure is a configuration diagram showing a heating device using exhaust heat according to an embodiment of the present invention. 1...Engine, 2...Radiator, 3...Radiator forward circuit, 4...Radiator return circuit,
5... Water pump, 6... Engine bypass circuit, 7, 8... Air vent line, 9... Filler section, 10... Filler line, 11... Heater circuit, 12... Exhaust heat exchanger, 13...Heater core, 14...Exhaust pipe, 15...Bypass exhaust pipe,
16...Exhaust switching valve, 17...Heater valve, 18...Bypass circuit, 19...Key switch, 20...Fan, 21...Fan switch,
22... Heater reinforcement switch, 23... Water temperature switch, 24... Solenoid valve, 25... Intake system, 26... Negative pressure actuator, 27... Piping.

Claims (1)

[Scope of utility model registration request] In the heating device using exhaust heat, the heater circuit through which cooling water flows after cooling the engine is provided with an exhaust heat exchanger through which exhaust gas is passed only when necessary, and a heater core connected in series with the heat exchanger. An open/close type heater valve is provided between the heater core and the exhaust heat exchanger, and the heater valve of the heater circuit and the exhaust heat exchanger are connected to the cooling water engine bypass circuit by a bypass circuit when the heater valve is closed. A heating device using exhaust heat, characterized by: