JPS6139605Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hot water heating system for a vehicle suitable for an engine-driven railway vehicle, and more particularly to a hot water heating system for a vehicle that uses the cooling water of a traveling engine as a heat source.

Conventionally, in this type of heating system, as shown in FIG. 6. The cooling water is circulated through the cooling water radiator 7 and returned to the water tank 3, and the cooling fan 9 of the cooling water cooling radiator 7 is controlled by the water temperature sensor 8 installed in the water channel on the engine outlet side. It is common practice to adjust the water temperature of the waterway on the engine outlet side to an appropriate temperature (70 to 80°C) and to control the fan 11 that circulates air between the passenger compartment 10 and the interior of the heater 5 using a room temperature sensor. In extremely cold regions, when the vehicle is temporarily stopped, meandering, or going down a long slope, when the engine is running at idle, the amount of heat generated by the engine is small and the cooling water temperature may be in a supercooled state. Eventually, the amount of heating heat will become insufficient.

For this reason, in vehicles for cold regions, water pump 1
A cooling water heater 13, which has a built-in check valve 2 and heats the cooling water by combustion of engine fuel, is connected in parallel with the check valve 2 as shown in the figure, but the installation cost of the cooling water heater is also high. However, the maintenance and inspection thereof is quite troublesome, and the fuel cost increases the vehicle operating cost.

The present invention attempts to eliminate the above-mentioned drawbacks by making this cooling water heater a simple device that utilizes high-temperature engine exhaust gas.

The present invention includes a heat exchanger 15 attached to the exhaust pipe 14 of the traveling engine 4 so as to heat the exhaust gas engine cooling water, and below the heat exchanger,
a valve 16 connected between the inlet and outlet water channels;
A heating device including the valve and a water pump 17 that sends engine cooling water to the heat exchanger is installed in parallel with the check valve 2 between the water tank 3 of the engine cooling water circulation system and the suction port of the traveling engine side water pump 1. When the cooling water temperature on the outlet side of the running engine is lower than the standard, the valve 16 is closed and the water pump 17 on the heating device side is driven, and when the cooling water temperature is higher than the standard, the valve is opened and the heating is performed. The apparatus is characterized by being equipped with a control device that stops the water pump on the apparatus side.

2 and 3 show an embodiment of the present invention applied to a railway vehicle, and in the figures, members denoted by the same reference numerals as in FIG. 1 indicate corresponding members. The heat exchanger 15 is a silencer 1 installed in the exhaust pipe 14 near the traveling engine.
8, and a cooling water channel 19 on the inlet side is provided at the bottom of one end of the heat exchanger 15.
A normally open solenoid valve 16 is inserted in the middle of a bypass channel 21 which connects the cooling channels 20 on the outlet side to the upper part of the other end and communicates the hanging portions of both channels 19 and 20. Outlet side cooling water channel 20
Safety valves 22, 2 are installed at the top of the water tank 3 and the top of the water tank 3.
3 is connected, and the key points of the cooling water channel 20 and the upper air chamber of the water tank 3 are appropriately connected through an air vent pipe 24, but the set pressure of the safety valve 23 is slightly higher than that of the safety valve 22.

In addition, manual valves 27 and 28 are installed at the suction waterway 25 of the water pump 17 that sends cooling water to the inlet cooling waterway 19, and at the connection portion of the outlet cooling waterway 20 to the traveling engine cooling water circulation waterway 26, respectively. A drainage pot 29 is connected to the lower end of the side cooling channel 19, and manual valves 27 and 28 are connected when heating is not required in the summer.
is closed to allow water in the heating device to be drained from the drain pot 29. 30 is the fan 11 of the heater 5
The fan 11 is driven only when the room temperature becomes lower than the standard temperature to circulate the air inside the vehicle compartment 10 into the heater 5 as shown by the arrow.

When operating the heating device by opening the manual valves 27 and 28 and closing the drain pot 29 in winter, the solenoid valve 16 and the water pump 1 are activated by the signal 31 of the water temperature sensor 8 to control the driving of the cooling fan 9.
7 are controlled simultaneously. That is, when the water temperature at the outlet of the traveling engine drops to, for example, 70 degrees Celsius or less, the cooling fan 9 is stopped, the solenoid valve 16 is turned on and switched to the closed position shown in the lower part of FIG. 2, and the water pump 17 is driven. let Furthermore, when the water temperature at the outlet of the traveling engine rises to, for example, 80° C. or higher, the cooling fan 9 is driven, the solenoid of the solenoid valve 16 is made non-conducting, and returned to the open position shown in the figure, and the water pump 17 is stopped. .

Therefore, if the water temperature at the engine outlet becomes lower than the standard, the solenoid valve 16 will close, and the check valve 2 will be closed by the suction pressure of the driven water pump 17 and the valve closing force by the valve spring. The cooling water in the water tank 3 sent out from the water pump 17 is heated through the heat exchanger 15, and then supplied to the engine 4 by the water pump 1, and is then supplied to the cooling fan 9.
When the engine stops, the water temperature at the engine outlet increases.

Also, if the water temperature at the engine outlet becomes higher than the standard, the solenoid valve 16 opens, and when the water pump 17 stops, the check valve 2 opens due to the suction pressure of the water pump 1 on the traveling engine side, so there is almost no water in the heating device waterway. No water flow is generated, and the small water flow generated by the water pump 1 on the traveling engine side passes through the bypass waterway 21, and together with the driving of the cooling fan 9, the water temperature on the engine outlet side is lowered. In this case heat exchanger 1
A part of the stagnant water in 5 becomes water vapor S due to engine exhaust heat, and the stagnant water in the 3
Push it out of the heat exchanger as shown in the figure. At this time, since the suction pressure (negative pressure) of the traveling engine side water pump 1 is acting within the heat exchanger, the steam pressure is small. In addition, the change in volume of water or steam in this case is absorbed by the air layer above the water tank 3 via the air vent pipe 24, and if the volume cannot be absorbed completely, the safety valves 22 and 23 are activated to prevent the pressure from increasing beyond the safety limit. .

If the water temperature at the engine outlet drops again in this way,
The solenoid valve 16 is closed again, the water pump 17 is driven, and the water supply pressure of the water pump forces the steam in the heat exchanger to be pushed out into the water channel 20. At the same time, a portion of the steam is transferred to the water channels 25, 19. Since it is absorbed by the water that is still cooled inside and rapidly heats it, the water temperature on the engine outlet side can be rapidly raised.

Although one embodiment has been described above, the heat exchanger 1
5' can also be installed in a muffler 18' of the engine exhaust pipe 14 as shown in FIG.

According to the present invention, when the water temperature rises on the exit side of the running engine, the water in the heat exchanger attached to the engine exhaust pipe is changed to steam to reduce the amount of absorbed heat, and when the water temperature falls on the engine exit side, the water is converted into steam. Because a portion of the steam in the exchanger is absorbed by the cooled water in the water channel on the heating device side, it is possible to reduce the range of fluctuation in water temperature on the exit side of the running engine, making it possible to equalize the heating capacity in cold regions. This has the effect of

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional device, FIG. 2 is a circuit diagram of an embodiment of the present invention, and FIG. 3 is a detailed diagram of its main parts.
FIG. 4 is a side sectional view of another embodiment of the heat exchanger. 1...Travel engine side water pump, 2...Check valve, 3...Water tank, 4...Travel engine, 5...
... Heater, 6 ... Radiator, 7 ... Cooling water cooling radiator, 8 ... Water temperature sensor, 10 ... Vehicle interior, 14 ... Exhaust pipe, 15 ... Heat exchanger, 16 ...
...Solenoid valve, 17...Heating device side water pump.

Claims (1)

[Scope of utility model registration request] In a hot water heating system for a vehicle that uses the cooling water of a traveling engine as a heat source, a heat exchanger is attached to the exhaust pipe of the traveling engine so that the engine cooling water is heated with the exhaust gas, and below the heat exchanger,
The heating device, which includes a valve connected between the inlet and outlet waterways, and a water pump that sends engine cooling water to the valve and the heat exchanger, is connected to the water tank of the engine cooling water circulation system and the water pump on the running engine side. Connected in parallel with a check valve between the openings, when the cooling water temperature on the outlet side of the traveling engine is lower than the standard, the valve is closed and the water pump on the heating device side is driven, and the cooling water temperature is higher than the standard. A hot water heating device for a vehicle, characterized in that a control device is provided for opening the valve and stopping the water pump on the heating device side.