JPH02124313A - Heating device for vehicle - Google Patents

Abstract

PURPOSE:To prevent the freezing of a medium and facilitate thawing as well as the restarting of a system by returning the whole medium in a heat pipe into an evaporator when the evaporator is cooled down to the vicinity of outdoor air temperature after stopping an engine. CONSTITUTION:Cooling water is circulated in a cooling water passage 3 between an engine 1 and a vehicle-room heater 2. A blast fan 5 feeds air for carrying out heat exchange with the cooling water circulating in a heat core 4. Further, a loop type heat pipe 11 conveys a medium for transmitting exhaust heat to the air by the evaporator 9 of an exhaust air passage 6. On the other hand, the condensing portion 14 of the heat pipe 11 is provided on the air outlet side of the heat core 4. In this case, the defined condition of the evaporator 9 after stopping an engine 1 is detected by a sensor 20. When this sensor 20 is on, a valve means 19 installed on a second pipe 16 between the condensing portion 14 and evaporator 9 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle heating system used in automobiles and the like.

[Prior Art and Problems to be Solved by the Present Invention] As a conventional vehicle heating device used in automobiles, etc., there is, for example, one shown in Japanese Utility Model Application Publication No. 59-16211.

However, according to such conventional technology, after the engine is stopped,
If the medium remains in the heat pipe, there is a risk that the medium may freeze at a location other than the evaporator during low outside temperatures such as in winter. Such freezing may make restarting difficult.

According to the present invention, in view of such conventional problems, it is an object of the present invention to provide a heating device for a vehicle that can be easily restarted even when the outside temperature is low, such as in winter.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a cooling water passage for cooling water circulation between the engine and the vehicle interior heater, and exchanges heat with the cooling water circulating through the heater core. On the other hand, a loop-type heat pipe is installed in which a medium for transmitting the exhaust heat to the air is carried by an evaporator installed in the wandering passage, and the condensing part of the heat pipe is connected to the passenger compartment. In the heating device attached to the air outlet side of the heater core, a sensor is provided for detecting a predetermined condition of the evaporator after the engine is stopped, and when the sensor is turned on, the valve means for returning all the medium to the evaporator is activated. This is installed in the middle of a medium return pipe between the evaporator and the evaporator.

[Function] After stopping the engine, when the sensor detects that the evaporator has cooled to a state close to the outside temperature, the sensor turns ON.
, the valve means is fully opened and all the medium in the heat pipe returns to the evaporator. Even if the medium freezes in the evaporator, if the engine is restarted, the frozen medium will immediately thaw due to the exhaust heat, making restarting the system extremely easy and reliable.

〔Example〕

1 and 2 are diagrams showing one embodiment of the present invention, in which reference numeral 1 is an engine, 2 is a vehicle interior heater, 3 is a cooling water passage for cooling water recirculation, 4 is a heater core, and 5 is the heater core. 4 is a blower fan that supplies air for heat exchange with the circulating cooling water; 6 is an exhaust passage of the engine 1; an evaporator 9 is located eccentrically to the passage between the catalytic converter 7 and the muffler 8;
A door 1 is provided on the upstream side of the evaporator 9 and can be opened and closed to allow or prevent the exhaust heat from being exposed to the evaporator 9.
has 0. 11 is a loop-type heat pipe, and a first pipe 15 connects the evaporator 9 and the condensing part 14 attached to the air outlet 13 side of the vehicle interior heater core 4;
It consists of a second pipe 16 that connects the condensing section 14 and a first pipe 15 near the evaporator 9, and the second pipe 16 includes a third pipe 17 that is connected to the downstream side of the condensing section 14, and a third pipe 17 connected to the downstream side of the condensing section 14. 3. A liquid tank 18 connected downstream of the three pipes 17, an electromagnetic valve 19 as a valve means disposed downstream of the liquid tank 18, and a sensor that detects a predetermined condition of the evaporator 9 after the engine 1 is stopped. A barrel amplifier 20 and a first pipe 1 connected downstream of the solenoid valve 19
5 and a fourth pipe 21 connected to the upstream side of the pipe 5.

When the amplifier 20 is turned on, the electromagnetic valve 19 opens, and the condensing section 14 and the evaporator A solenoid valve 19 is interposed in the middle of a second pipe 16 for returning the medium between the pipe and the pipe 9.

The amplifier 20, as shown in FIG.
A may be used to detect that the temperature of the evaporator 9 has dropped to near the outside temperature, or as shown in FIG. It may be possible to detect the elapsed time, and as shown in FIG. 4, the capillary tube 20c
The temperature of the evaporator 9 may be detected to be lower than a predetermined temperature by using the evaporator 9. In the case of FIG. 4, when the capillary tube 20c is activated (that is, turned ON),
The sealed gas 20e pulls the valve 20d downward (in the direction of the arrow), causing the evaporator 9 and liquid tank 18 to
The medium is communicated with the evaporator 9 through the fourth pipe 21, and the medium flows into the evaporator 9.

Therefore, when a car or the like is stopped, the engine 1 is stopped, and the outside temperature is low, the amplifier 20, which is a sensor, detects a predetermined value, and the solenoid valve 19, which is a valve means, etc. is opened and the medium flows into the evaporator 9, so when the evaporator 9 is restarted, the medium in the evaporator 9 is quickly thawed, and the system can therefore be put into operation in a short time.

In addition, the upstream of the evaporator 9 is 300 mph when the engine 1 is fully open.
℃, but by placing the door 10 on the side of the evaporator 9 (indicated by the broken line in Figure 1), the exhaust gas will reach the muffler 8 directly.
There is no deterioration in power performance.

〔effect〕

As described above, according to the present invention, a cooling water passage for circulating cooling water is provided between the engine and the vehicle interior heater, and a blower fan supplies air for heat exchange with the cooling water circulating through the heater core. At the same time, a loop heat pipe is provided in which a medium for transmitting the exhaust heat to the air is carried by an evaporator provided in the exhaust passage, and the condensing part of the heat pipe is attached to the air outlet side of the heater core for the vehicle interior. In the heating device, a sensor is provided to detect a predetermined condition of the evaporator after the engine is stopped, and when the sensor is turned on, a valve means for returning all the medium to the evaporator is provided between the condensing section and the evaporator. Because it is interposed in the middle of the medium return pipe, it is easy to restart the exhaust heat heater system even when the outside air is relatively low, such as in winter, and even if the medium freezes, the exhaust heat Since the evaporator is disposed at the area where the ice is applied, it has the practical effect of making it easier to melt the ice.

[Brief explanation of drawings]

1 and 2 are diagrams showing one embodiment of the present invention, in which FIG. 1 is an explanatory diagram of the main part, FIG. 2 is an enlarged view of the main part showing an example of the sensor, and FIGS. 3 and 4. 2A and 2B are enlarged views of main parts showing embodiments of sensors different from those in FIG. 2. FIG. 1... Engine, 2... In-vehicle heater, 3
... Cooling water passage, 4 ... Heater core,
5...Blower fan, 6...Exhaust passage,
9... Evaporator, 11... Heat pipe, 14... Condensing section, 16... Second pipe serving as medium return pipe, 19... ...Valve means, 20...Sensor.

Claims (1)

[Scope of Claims] A cooling water passage for circulating cooling water is provided between the engine and the vehicle interior heater, and a blower fan is provided for supplying air for heat exchange with the cooling water circulating through the heater core. In the heating device, a loop heat pipe is provided in which a medium for transmitting the exhaust heat to the air is conveyed by an evaporator provided, and a condensing part of the heat pipe is attached to the air outlet side of a heater core for a vehicle interior. A sensor is provided to detect a predetermined condition of the evaporator after the evaporator is stopped, and a valve means for returning all the medium to the evaporator when the sensor is turned on is provided in the middle of the medium return pipe between the condensing section and the evaporator. A heating device for a vehicle characterized by being equipped with an intervening device.