JPH0356406Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a device for heating a nap bed provided in a vehicle.

<Prior Art> In vehicles such as trucks, a bed for napping is sometimes installed in the cabin behind the driver's seat. In a truck equipped with a nap bed as described above, when driving long distances, the driver can park at an appropriate place and take a nap to recover from fatigue.

However, when the weather is cold, the temperature inside the vehicle drops, making it difficult to take a comfortable nap. Therefore, it may be possible to keep the engine running to heat the interior of the vehicle even while the vehicle is parked, but in this case, fuel efficiency would deteriorate, or it would be necessary to consider the impact of exhaust gas and noise on the surrounding area. There was a problem that parking locations were also restricted.

In view of this situation, there is a system that uses engine cooling water to heat a nap bed, as seen in Japanese Utility Model Application No. 56-6608 or 1987-127009. be.

However, when the conventional heating systems disclosed in these publications circulate and supply cooling water from the engine to the sleeping bed for heating, the engine dissipates heat when the engine is not in operation. It was not possible to keep the nap bed heated for a long time because it acted as a container.

<Problems to be solved by the invention> The present invention was made in view of the above-mentioned circumstances, and aims to comfortably heat a nap bed for a long period of time by effectively utilizing the exhaust heat generated by engine operation. An object of the present invention is to provide a heating device for a nap bed for a vehicle.

<Means for Solving the Problems> In order to solve the above problems, the present invention is a device for heating a nap bed installed in a vehicle, in which a hot water tank that also serves as a radiator is built into the nap bed. At the same time, a heat exchanger is provided for exchanging heat between the exhaust gas of the engine mounted on the vehicle and water, and the hot water tank and the heat exchanger are connected in circulation via a pipe. Moreover, by interposing an auxiliary heater in the pipe leading from the outlet of the hot water tank to the inlet of the heat exchanger, and by providing a water pump in the pipe leading from the outlet of the heat exchanger to the inlet of the hot water tank, the water pump can be operated. Water (hot water) can be circulated between the hot water tank and the heat exchanger in conjunction with the water feeding action.

On the other hand, after connecting a pipe downstream of the auxiliary heater and upstream of the heat exchanger and a pipe downstream of the heat exchanger and upstream of the water pump via a bypass pipe, A switching valve is provided to control whether or not the water flowing out from the hot water tank via the auxiliary heater and returned to the tank as a result of the water feeding operation is passed through the heat exchanger.

Further, a regulating valve is provided to adjust the flow rate of exhaust gas supplied to the heat exchanger, and a temperature sensor is provided to detect the temperature of water in the hot water tank. By providing a controller that controls each of the water pump, auxiliary heater, switching valve, and regulating valve based on the output of the temperature sensor, the heat energy stored in the water via the heat exchanger can be used to take a nap. The feature is that the bed is heated.

<Function> In the vehicle nap bed heating system configured as described above, when the engine is running, the water pump is operated and the bypass pipe is closed by the switching valve, so that the water flowing out from the hot water tank ( hot water) is returned to the hot water tank via a heat exchanger. Also, at this time, exhaust gas discharged as the engine is operating is being supplied to the heat exchanger. For this reason, the water (hot water) whose temperature has been raised by the heat exchange action of the heat exchanger is returned to the hot water tank, thereby storing heat therein. Note that while the engine is being operated in this manner, the auxiliary heater is not activated by a signal from the controller.

When the temperature sensor detects that the temperature of the water (hot water) stored in the hot water tank has risen to a predetermined value, the water pump is stopped by a command from the controller, and the regulating valve and switching valve are activated. The switch is activated to stop the supply of exhaust gas and water (hot water) to the heat exchanger. Therefore, in this state, the temperature of the water in the hot water tank is maintained, and the nap bed is heated by the heat radiation effect of the hot water tank. In this case, since the water supply to the heat exchanger is stopped by the switching valve,
This heat exchanger does not function as a radiator, and loss of stored thermal energy is prevented.

As time passes, the temperature of the water in the hot water tank decreases, and when the temperature sensor detects that the temperature of this water has become lower than a predetermined value, the auxiliary heater is activated by a command from the controller. Water pump operates. Then, the water in the hot water tank is supplied to the auxiliary heater by the water feeding action of the water pump, and after being subjected to the temperature raising action of the auxiliary heater, it is returned to the hot water tank through the bypass pipe and the water pump. Therefore, even when the engine is stopped, the temperature of the water (hot water) in the hot water tank (radiator) is maintained at an appropriate temperature, providing comfortable heating for a long time. Note that even when the auxiliary heater is operated in this manner, the switching valve stops the supply of water to the heat exchanger, so the heat exchanger does not function as a radiator.

Furthermore, since the hot water tank that also serves as a radiator is built into the nap bed, even if the hot water tank is enlarged to increase the amount of heat storage, the effective space inside the vehicle will not be reduced.

<Examples> Examples of the present invention will be described below based on the drawings. FIG. 1 shows an embodiment in which the present invention is applied to a truck, in which a bed 1 for napping is provided in the passenger compartment forming the driver's seat of the truck. A hot water tank 2 that also serves as a radiator is provided inside the nap bed 1, and a heat exchanger 5 is connected to the hot water tank 2.
are connected in circulation via pipes 3 and 4. The heat exchanger 5 is installed in a branch pipe 7 branched from an exhaust pipe 6 of an engine mounted on the vehicle, and the exhaust gas from the engine passing through the branch pipe 7 and the pipe 3,
4 and the water supplied from the hot water tank 2. Furthermore, by providing a regulating valve 8 at the branch between the exhaust pipe 6 and the branch pipe 7, the opening degree of the regulating valve 7 can be variably controlled by the electromagnetic actuator 9 to adjust the flow rate of exhaust gas passing through the branch pipe 7. That's what I do.

In addition, a temperature sensor 12 and an auxiliary heater 11 are installed in the pipe 3 extending from the outlet of the hot water tank 2 to the inlet of the heat exchanger 5, and a water pump is installed in the pipe 4 extending from the outlet of the heat exchanger 5 to the inlet of the hot water tank 2. 10, water in the hot water tank 2 is supplied to the heat exchanger 5 after passing through the temperature sensor 12 and the auxiliary heater 11 as the water pump 10 operates, and from the heat exchanger 5 to the water pump 1.
0 and then returned to the hot water tank 2. A pipe 13 is located downstream of the auxiliary heater 11 and upstream of the heat exchanger 5, and a pipe 4 is located downstream of the heat exchanger 5 and upstream of the water pump 10.
are connected via a bypass pipe 13, and a switching valve 14 operated by an electromagnetic actuator 15 is provided at the confluence of the bypass pipe 13 and the pipe 4.
switch operation to switch from hot water tank 2 to auxiliary heater 1.
It is possible to select whether or not the water flowing out through the heat exchanger 5 should be returned to the hot water tank 2 via the heat exchanger 5.

A controller 16 is provided to which the output signal of the temperature sensor 12 is supplied as control information,
This controller 16 controls the water pump, the auxiliary heater 11, and the electromagnetic actuators 9 and 15. 17 is Batsuteri.

In the vehicle nap bed heating system configured as described above, the water stored in the hot water tank 2, which also serves as a radiator and built into the nap bed 1, is used as a heat source using engine exhaust gas while the vehicle is running. It is heated and stored as heat.

That is, since the regulating valve 8 is switched as shown in FIG. 1 via the electromagnetic actuator 9 in response to a signal output from the controller 16, exhaust gas from the engine is guided to the branch passage 7. at the same time,
The switching valve 14 is actuated via the electromagnetic actuator 15 by the signal output from the controller 16 to cut off communication between the water pump 10 and the bypass pipe 13 and connect the water pump 10 to the heat exchanger 5. The water pump 10 is driven by a signal from. Therefore, the water in the hot water tank 2 is supplied to the heat exchanger 5 through the pipe 3 provided with the auxiliary heater 11, where it exchanges heat with the exhaust gas passing through the branch passage 7 and rises. After that, the water is returned to the hot water tank 2 through the pipe 4 and the water pump 10, so the temperature of the water in the hot water tank 2 gradually rises.

The temperature of the water that is heated while circulating between the hot water tank 2 and the heat exchanger 5 is monitored by the temperature sensor 12, and the temperature of the water detected via this temperature sensor 12 is lower than a predetermined value. When the temperature rises, the water pump 10 is stopped by a signal from the controller 16. At the same time, since signals are also supplied from the controller 16 to the electromagnetic actuators 9 and 15, the regulating valve 8 is switched to prevent exhaust gas from being supplied to the branch passage 7, and the switching valve 14 is switched to prevent exhaust gas from being supplied to the branch passage 7. The water pump 10 is switched and connected from the bypass pipe 13 side to the heat exchanger 5 side.
Therefore, even after the engine is stopped, water does not flow into the heat exchanger 5, so the heat exchanger 5 does not function as a radiator, and moreover, the hot water tank 2
Since the water inside has a large specific heat, it can continue to heat the nap bed 1 for a long time.

In addition, if the temperature of the water in the hot water tank 2 decreases over time and the heating effect decreases, the water pump 10 and the auxiliary heater 1 are activated from the controller 16 based on the signal from the temperature sensor 12.
1 are each supplied with an actuation signal. Then, the water in the hot water tank 2 is supplied to the auxiliary heater 11 and heated, then supplied to the water pump 10 through the bypass pipe 13, returned to the hot water tank 2 from the water pump 10, and then returned to the auxiliary heater 11. As water is supplied, water is circulated between the hot water tank 2 and the auxiliary heater 11, and heating by the auxiliary heater 11 is performed. Therefore, even when the engine is stopped, the temperature of the water in the hot water tank 2 does not drop below the set value, and comfortable heating continues.

By the way, in order to comfortably heat the nap bed for a long period of time, it is necessary to increase the capacity of the hot water tank 2 to increase the capacity of water, which is a heat storage medium, and to reduce heat loss. However, if the hot water tank 2 is given the function of a radiator and built into the nap bed 1 as in the present invention, the provision of the hot water tank 2 suppresses the reduction in the effective space in the passenger compartment. This has the advantage of reducing heat transfer loss. Furthermore, since heat is exchanged directly between water, which is a heat storage medium, and high-temperature exhaust gas, the configuration is simpler than those in which a heat transfer means such as a heat pipe is interposed between the two. It is also possible to reduce costs.

<Effects of the invention> As is clear from the above explanation, according to the invention, when the engine is running, the water in the hot water tank is circulated and supplied to the heat exchanger to raise its temperature, and after the engine is stopped, the water is supplied to the heat exchanger. While suppressing the drop in water temperature caused by water supply, the auxiliary heater can be operated as needed to maintain the temperature in the hot water tank that also serves as a radiator, making it a bed for napping for long periods of time. can be heated comfortably. Furthermore, since the hot water tank is built into the nap bed, even if the hot water tank is enlarged to provide comfortable heating over a long period of time, the effective space inside the vehicle will not be reduced. Furthermore, since the hot water tank also serves as a radiator, the configuration is simplified and heat transfer loss can be reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a heating device for a vehicle nap bed according to the present invention. 1... Bed for napping, 2... Hot water tank (radiator), 3, 4... Pipes, 5... Heat exchanger, 6...
...exhaust pipe, 7...branch pipe, 8...regulating valve, 10...
...Water pump, 11...Auxiliary heater, 12...Temperature sensor, 13...Bypass pipe, 14...Switching valve.

Claims (1)

[Scope of utility model registration request] A device for heating a nap bed provided in a vehicle, comprising: a hot water tank that also serves as a radiator built into the nap bed; and a heat exchanger that exchanges heat between exhaust gas from an engine mounted on the vehicle and water; an auxiliary heater installed in a pipe leading from the outlet of the hot water tank to the inlet of the heat exchanger; a water pump installed in the pipe leading from the outlet of the heat exchanger to the inlet of the hot water tank; and a downstream side of the auxiliary heater. a bypass pipe that connects a pipe on the upstream side of the heat exchanger and a pipe on the downstream side of the heat exchanger and upstream of the water pump; a switching valve that controls whether or not the water that flows out through the heater and is returned to the tank is passed through the heat exchanger; and an adjustment valve that adjusts the flow rate of exhaust gas supplied to the heat exchanger; A temperature sensor that detects the temperature of water in the hot water tank; and a controller that controls the water pump, the auxiliary heater, the switching valve, and the regulating valve based on the output of the temperature sensor, and A heating device for a nap bed for a vehicle, characterized in that the nap bed is heated using thermal energy stored in water.