JPH0796366B2 - Vehicle heat insulation device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a combustor for keeping a room warm or heating in a vehicle such as a vehicle equipped with an internal combustion engine, a trailer, or a railway,
The present invention relates to a vehicle heat retention device equipped with a heating unit including a blower and a heat exchanger.

[Conventional technology]

BACKGROUND ART Conventionally, as for indoor heating of a vehicle, cooling water of an internal combustion engine is taken out by a hot water pipe, which is introduced to a heater device, and indirectly performs heat exchange to send hot air into the room for indoor heating. There is.

In addition, a burner, that is, a combustor and a heat exchanger are provided in the intake passage of the engine, the combustor is ignited immediately after the engine is started, and the heat is used to warm the air in the vehicle interior to warm the warm air. A device to be introduced into, in other words, an automotive heating device that performs indoor heating by the amount of heat generated by burning fuel by a combustor irrespective of the internal combustion engine (for example, see JP-A-60-252018). ing.

Further, a combustion gas of the combustor is supplied to an intake port of the engine through a heat exchanger, and an engine warm-up device that guides air heated by the heat exchanger to the passenger compartment (for example,
Japanese Patent Laid-Open No. 61-79864) is disclosed.

Further, a vehicle heat retaining device to which a heat exchanger for vehicle heating as disclosed in JP-A-61-188216 is applied, or a vehicle as disclosed in JP-A-61-211118. There is a combustion device for the heat storage. This will be outlined with reference to FIGS. 5 and 6.

Referring to FIG. 5, in the combustion device 60 of the vehicle heat insulation box, the intake manifold of the internal combustion engine 61 and the air cleaner 63 are connected by the intake pipe 62. Bypass pipe 64 is provided in the middle of intake pipe 62, burner 65 is connected to bypass pipe 64,
A heat exchanger 66 is arranged downstream of the burner 65. The warm air warmed by the heat exchanger 66 is blown out from the warm air outlet 68 into the heat insulation box 67 through the conduction path 69.

In FIG. 6, the outline of the combustion device 60 of the vehicle heat storage is shown. The heat exchanger 66 introduces the air outside the vehicle from the air intake into the inside of the heat exchanger 66 from the air intake 79 through the air cleaner 63 and the blower 77 to exchange heat with the combustion gas from the burner 65. The warmed air is sent out from the air outlet 80 to the conducting path 69. The burner 65 has a fuel supply 74
A vaporization plug 75 and an ignition plug 76 connected to the are installed. The control device 70 is a room temperature sensor provided in the heat insulation box 67.
The burner 65 is controlled by receiving the temperature signal from 78. In the figure,
71 is an operation switch of the control device 70, 72 is a battery, and 73 is a fuel tank.

[Problems to be solved by the invention]

However, in the case of performing indoor heating by using the cooling water of the internal combustion engine, it takes a long time for the heater body to send out warm air because the temperature rising speed of the cooling water is slow, and the heater is in the meantime. It has almost no heating function. In other words, it takes about 10 minutes or more for a gasoline engine and about 10 minutes for a diesel engine until the engine warms up.
Currently, it takes more than 20 minutes. During this time, especially in cold regions and winter, the inside of the vehicle is cold, and frost on the windows of the vehicle,
The defroster that removes ice and the like has a problem that it cannot function sufficiently.

Further, regarding an automobile heating system or an engine warming system that uses a combustor regardless of the internal combustion engine, it takes time and labor for the combustion cycle, exhaust gas treatment, etc., and a complicated mechanism and control device are required. There are problems such as

Further, regarding the combustion device of the vehicle heat storage box shown in FIG. 5 using the heat exchanger or the like, the liquid fuel is quickly burned by the rapid ignition system and the rapid vaporization system, and the combustion heat is used to efficiently and efficiently Produces heating air quickly,
It is possible to send clean heating air that is not mixed with exhaust gas into the vehicle, but it supplies hot air effectively and strongly into the heat-retaining cabinet, and also increases the circulating air volume to make the temperature distribution in the room uniform. There is a problem to be solved in that the temperature of the room is maintained and the temperature of the room is prevented from lowering due to heat escaping from the room due to opening / closing of the loading / unloading door.

Therefore, an object of the present invention is to solve the above-mentioned problems, to provide a combustor that uses a liquid fuel such as light oil and kerosene, and to quickly vaporize the liquid fuel by a rapid ignition system and a rapid vaporization system. The vaporized fuel is ignited and combusted, heating air is efficiently and quickly generated from the combustion heat, and clean heating air that does not contain exhaust gas is sent into the interior of a vehicle or the like. It is configured to heat or heat the room such as, effectively and strongly, i.e., forcibly blow out hot air into the cargo compartment, increase the amount of circulating air, and make the temperature distribution in the room uniform, It is an object of the present invention to provide a vehicle heat retention device capable of preventing a decrease in indoor temperature due to heat escape due to opening / closing of an opening / closing door of a cargo storage.

[Means for solving problems]

The present invention is configured as follows to achieve the above object. That is, the present invention relates to a vehicle heat retention device having a heating unit including at least a combustor, a blower, and a heat exchanger for supplying warm air to a cargo storage mounted on a vehicle, and a blower connected to the heating unit. A plurality of hot air outlets communicating with the cargo compartment and opened in the cargo storage compartment, a fan arranged in at least one of the hot air outlets, and an air collecting opening for air intake opened in the cargo storage compartment. When,
An air circulation passage communicating with the air collecting port and having an air intake for sucking outside air and communicating with the air suction passage of the heating unit; and one of the air collecting port and the air intake is opened to the air circulation passage. And a switching door that closes the other,
A door switch for detecting opening / closing of an opening / closing door attached to the cargo storage, and the switching door opens the air collecting port to close the air collecting port when the opening / closing door is closed based on a signal from the door switch. The present invention relates to a vehicle heat insulation device, characterized in that the inlet is closed and the switching door is configured to close the air collecting port and open the air intake when the opening / closing door is opened.

Further, in this vehicle heat retention device, the fan is arranged at the warm air outlet located in the height direction on the rear side of the vehicle.

[Action]

The vehicle heat retention device according to the present invention is configured as described above and operates as follows. That is, when the open / close door mounted on the cargo storage is closed, this vehicle heat retention device causes the switching door to open the air collection port and close the air intake port by the closing signal from the door switch, and the heating unit The warm air blown to the cargo storage through the blower unit and the warm air outlet is introduced into the air circulation passage through the air collecting port, and is circulated from the air suction passage to the heating unit.

Also, when the open / close door installed in the cargo storage is opened, the switching door closes the air collecting port and opens the air intake port by the closing signal from the door switch, so the warm air from the heating unit is blown by the blower. And is blown to the cargo storage through the hot air outlet, and the heating unit is supplied with outside air from the air inlet through the air circulation passage and the air suction passage.

〔Example〕

Embodiments of a vehicle heat insulation device according to the present invention will be described below in detail with reference to the drawings.

In FIG. 1, an embodiment of a vehicle heat retention apparatus according to the present invention is generally indicated by reference numeral 10. FIG. 1 shows a cab 16 and a cargo storage 13 equipped with this vehicle heat insulation device 10.
Shows a side view of a vehicle consisting of. FIG. 2 shows a rear view of the vehicle of FIG.

In this vehicle heat retention device 10, for example, air taken in through an air cleaner such as an engine, or air taken in directly from the outside or indoors is taken into the combustor 1 from an air intake pipe by a blower and generated in the combustor 1. Combustion gas, that is, hot air, is sent to a heat exchanger 2 installed downstream of the combustor 1, and heat is exchanged with air by the heat exchanger 2, and a plurality of warm air outlets 12 through a blower unit 8 to a cargo storage 13 or the like. Hot air is blown into the room 4 to keep it warm, that is, to heat the room 4.

This vehicle heat retention device, for example, loads food items such as bread and fresh foods such as vegetables into the cargo storage 13 and transports and stores them while maintaining them at a predetermined temperature. It can be used to go or heat the room 4.

This vehicle heat retention device 10 is shown to be applied to a vehicle mounted in a cargo storage 13 covered with a heat insulating wall or the like on a cargo bed of the vehicle. A heating unit including a combustor 1, a blower (not shown) for supplying combustion air to the combustor 1, a heat exchanger 2, a blower 7 for heating air circulation, etc. between a front wheel 15 and a rear wheel 14 of the vehicle. Are arranged. Further, downstream of the heat exchanger 2, there is provided an air blowing unit 8 that communicates warm air with the warm air outlet 12 in order to send the warm air into the cargo storage 13.

The blower unit 8 is located below the cargo storage 13. Blower 8
Communicates with the warm air outlet 12 on the side wall of the heat-retaining box, that is, the cargo storage 13 and the warm air outlet 12 on the rear side wall. A plurality of hot air outlets 12 on the side wall are provided in the lower portion of the cargo storage 13 in the longitudinal direction, and a plurality of hot air outlets 12 on the rear side wall are provided in the height direction close to the open / close door 3 of the cargo storage 13. It is provided individually.
Further, a fan 20 is arranged at the warm air outlet 12 of the rear side wall portion, and has a function of forcibly blowing out the warm air of the air blowing portion 8 into the room 4.

Moreover, the warm air from these fans 20 is configured to blow out in the width direction of the cargo storage 13. Therefore, an air curtain can be formed at the entrance and exit of the cargo storage 13 by the warm air outlet 12 of the rear side wall.

A door switch 27 is installed in the cargo storage 13 in order to detect that the opening / closing door 3 is opened / closed. Stowage
As shown in FIG. 2, both side wall portions of the outer wall 13 and outer wall 18 are
It is formed in a double wall composed of 19 and a hot air passage, that is, an air passage 8 is formed in the double wall. Further, the air blowers 8 on both side walls are communicated with each other by a distribution pipe 9.
Also, a hot air outlet 12 is formed. Further, an air collecting port 5 for sucking the air in the room 4 is formed in the inner wall 19 at the front end portion and the upper portion of the cargo storage 13. A filter or the like may be installed in the air collecting port 5, and the air may be cleaned and circulated in the room 4 by the filter. Further, an air intake 26 for sucking outside air is formed on the outer wall 18 of the cargo storage 13 at a portion corresponding to the air collecting port 5.

Further, a switching door 25 is provided to close either the air collecting port 5 or the air intake port 26. The switching operation of the switching door 25 is configured to respond to a signal from a door switch 27 installed in the cargo storage 13. An air circulation passage 17 is provided between the cab 16 and the cargo storage 13 of the vehicle. The air circulation passage 17 communicates with the air suction passage 21 in order to suck and circulate the air in the room 4 from the air collecting portion 5 or suck the outside air through the air inlet 26.

Regarding the blower 7 and the fan 20 in the heating unit, the air is blown into the heat exchanger 2 through the air suction passage 21, and then the hot air outlet 12 is passed through the blower section 8 of the heat exchanger 2.
The hot air is sent from the inside to the interior 4 of the cargo storage 13 to circulate the air.

A blower (not shown) is provided to supply the combustion air to the combustor 1, and the exhaust gas generated in the combustor 1, that is, the combustion gas is exhausted to the engine or the atmosphere. The heating unit used in the vehicle heat retention device 10, that is, the power source for operating the combustor 1, the heat exchanger 2, the blower 7, and the control device that controls these, is equipped with a battery, a generator installed in the vehicle, The combustor 1, the heat exchanger 2, the blower 7 and the control device for controlling them are power sources so that they can be applied not only to DC power sources such as electric motors but also to AC power sources for home use, business use, etc. Can be configured to be switched.

In FIG. 3, the fan 20 applied to the hot air outlet 12 in this vehicle heat retention device is shown. Fan 20
Is installed in the warm air outlet 12 on the rear side wall of the cargo storage 13. Fan 20 is a small fan motor
22 and a blade 24 rotated thereby. The small fan motor 22 is attached to the crossbar 23 of the attachment frame 25 fitted to the warm air outlet 12 formed on the inner wall 19. Therefore, the warm air blown from the heat exchanger 2 through the air blower 8 is sucked by the fan 20 and forcedly blown out into the room 4 of the cargo storage 13.

In FIG. 4, a front view of the fan 20 shown in FIG. 3 is shown. The mounting frame 25 fitted to the hot air outlet formed on the side wall has a crossbar 23 extending in the diametrical direction,
A small fan motor 22 is attached to the crossbar 23.

Next, although details of the combustor 1 and the heat exchanger 2 are not shown, it is preferable to use, for example, those having the following configurations.

An example of the heat exchanger 2 will be described. An air blower 7 is installed upstream of the heat exchanger 2 through an air intake pipe or the like. A collecting pipe in the air circulation passage may be attached to the suction port of the blower 7. The air circulation passage may be configured to become gradually narrower toward the downstream side, or may be a simple circulation pipe. The heat exchanger 2 has a structure in which a heat absorption passage cylinder is arranged on the outer circumference of a heat passage cylinder that is a double cylinder. The heat flow passage tube body is composed of a heat flow outward path tube body and a heat flow return path tube body arranged on the outer periphery thereof. The combustor 1 is attached to one end of the heat flow passage cylinder.

Therefore, the heat exchanger 2 radiates the heat flow passage through which the combustion gas from the combustor 1 passes in the central portion, the heat transfer passage through which the combustion heat of the combustion gas is transmitted to the outer peripheral side in the middle portion, and the combustion heat to the outer side It is composed of an endothermic passage that turns cold air into warm air. Moreover, the heat flow passage, the heat transfer passage, and the heat absorption passage are arranged coaxially with each other. The heat absorption passage cylinder constitutes an outer case of the heat exchanger 2 and is covered with a heat insulating material or the like. At both ends of the outer case, an air intake pipe is formed at one end and an air delivery pipe, that is, an air blower is formed at the other end. A cup-shaped lid with fins is fixed to the end of the heat flow return tube.

With this structure, the flow passage of the combustion gas, that is, the heat flow passage and the heat transfer passage, and the flow passage of the air to be heated for heating, that is, the heat absorption passage are completely cut off.
Further, the other end of the heat-flow-outgoing-passage tubular body communicates with one end of the heat-flow-backward-passing tubular body, and a combustion gas discharge port is formed at the other end of the heat-flow-backward traveling tubular body. The combustion gas may be sent to the intake system of the engine.
In that case, it may be configured so that it can be switched to either an exhaust pipe for directly exhausting to the outside or a feed pipe for feeding to the engine. Further, the heat receiving fins are formed inside the heat flow return path tubular body, and the heat radiation fins are formed outside the heat flow return path tubular body.

Next, an example of the combustor 1 will be described. The combustor 1 is composed of a combustion cylinder, and the combustion cylinder is partitioned into a combustion chamber of a vaporization chamber by a partition plate having a communication hole, and a vaporizer having a glow plug for vaporization is disposed so as to penetrate the combustion chamber. An ejection port for ejecting vaporized fuel vaporized by the vaporizer is opened in the vaporization chamber, and an ignition glow plug is installed in the vaporization chamber. The vaporization glow plug vaporizes the liquid fuel into vaporized fuel, and takes in combustion air to produce vaporized fuel and a mixture, which is ignited by the ignition glow plug to slightly present oil droplets or mixture. , Burning the mixture in the combustion chamber.

By using such a combustor 1, the liquid fuel is rapidly vaporized to vaporized fuel, and the vaporized fuel is rapidly ignited, that is, ignited, thereby enabling rapid combustion. As a result, the combustor 1 can immediately send the combustion gas to the heat exchanger 2, can quickly perform the function of the heat exchanger 2, and can rapidly heat the interior of the vehicle or the like.

The vehicle heat retention device according to the present invention is configured as described above, and the operation of the vehicle heat retention device 10 shown in FIGS. 1 and 2 is as follows. In order to make it easier to understand the description of the operation, the case where the combustor 1 and the heat exchanger 2 described above are used will be described.

First, the heating operation of the vehicle heat retention device 10 according to the present invention when the open / close door 3 of the cargo storage 13 is closed will be described. In this case, the open / close door 3 is interlocked with the door switch 27 provided in the cargo storage 13. For example, when the open / close door 3 closes the cargo storage 13, the door switch 27 is turned off. The switching door 25 that responds to the signal from the door switch 27 closes the air intake 26 for sucking the outside air. Therefore, the air collecting port 5 is opened, and the room 4 and the air suction passage 17 are in communication with each other.

When the engine in the vehicle is operating, use the DC power supply or power source from the battery, generator or motor installed in the vehicle, or when the engine in the vehicle is not operating, that is, when the vehicle is parked, etc. If the engine is not running, the battery installed in the vehicle,
Or using an AC power supply for household (100V power supply), commercial use (200V power supply, etc.), blower 7, blower for combustor 1, fuel supply device, ignition glow plug, vaporization glow plug, etc. Operate the control device etc. to control.

By these operations, the liquid fuel is supplied to the combustor 1, the vaporized glow plug vaporizes the vaporized fuel, and the ignition glow plug ignites or ignites the fuel.
The vaporized fuel forms a mixture with the combustion air from the blower and becomes a combustion state. The combustion gas generated by the combustor 1 is blown into the heat flow passage in the heat flow outward cylinder. The combustion gas blown into the heat flow passage makes U-turns from the heat flow passage of the heat flow passage tubular body by being guided by the lid, and flows through the heat transfer passage in the heat flow return passage tubular body. Since a large number of heat receiving fins are installed in the heat transfer passage in the radial direction, the combustion gas is deprived of combustion heat by the heat receiving fins and finally discharged from the combustion gas exhaust port (not shown) to the engine or the atmosphere.

On the other hand, the air to be warmed is supplied to the air suction passage by the blower 7.
It is sucked in from the blower 17, passes through the air intake pipe or the like from the blower 7, and is sucked into the heat absorption passage tube body of the heat exchanger 2. The sent-in air flows through between the radiation fins installed in the heat absorption passage. A large number of radial radiating fins are fixedly arranged on the outer periphery of the heat flow return path tubular body in the heat absorbing passage,
The air passes between the radiating fins to absorb the combustion heat from the radiating fins, that is, it is taken away and warmed. The warmed air becomes warm air, and then is further warmed and flows through a plurality of heat radiation fins radially provided on the outer periphery of the lid body.

Then, the warmed hot air is blown into the blower unit 8.
The warm air blown into the blower unit 8 has a side wall inside the cargo storage 13.
The hot air outlet 12 formed in 19 and the hot air outlet 12 provided in the height direction near the opening / closing door 3 and formed on the inner side wall 19 are blown into the room 4 of the cargo storage 13. Moreover,
From the warm air outlet 12 in which the fan 20 is installed, a strong and large amount of air comes to be blown out. The warm air keeps the room 4 warm, that is, heats it, and then passes through the filter of the air collecting port 5 formed in the upper part of the cargo storage 13 to the air suction passage 17 and is sucked into the heat exchanger 2 by the action of the blower 7. . Heat exchanger 2
The heat of the air is again exchanged by the air, and the air is circulated from the hot air outlet 12 into the cargo storage 13 through the air blower 8. By repeating the above operation, the inside of the cargo storage 13 is kept at a predetermined temperature.

Next, when this vehicle heat insulation device is operating,
The case where the opening / closing door 3 of 13 is opened will be described. In this case, the door switch 27 provided on the cargo storage 13 by the opening / closing door 3
Away from, for example, the door switch 27 is turned on.
The switching door 25 responding to the signal from the door switch 27 opens the air intake 26 for sucking the outside air, so that the air collecting port 5 is closed and the communication between the room 4 and the air circulation passage 17 is cut off. . Then, through the air intake 26, an air circulation passage
17 becomes open to the atmosphere.

By the way, the heating unit in the vehicle heat retention device 10 is operating, and the fan 20 is also operating. Therefore, the heating unit takes in fresh air through the air intake 26 and exchanges heat with warm air, and the warm air passes through the blower unit 8 and the fan 20.
Is blown out in the width direction of the cargo storage 13. Therefore, an active or compulsory air curtain is formed near the opening / closing door 3, the warm air in the room 4 of the cargo storage 13 does not flow out, and the room 4 is maintained at a predetermined temperature. . Next, when the opening / closing door 3 is closed and the door switch 27 is turned off, the switching door 25 is immediately switched to close the air intake 26,
The air collecting port 5 is opened. After that, the above heating operation is performed.

As described above, the embodiments of the vehicle heat insulation device according to the present invention have been described in detail, but the present invention is not necessarily limited to these details. For example, in the embodiment, the heating unit is
Although it is a configuration that is arranged individually, a plurality of may be arranged,
Further, the air collecting port, the air intake port, and the air circulation passage in the vehicle including the cab and the cargo storage are formed between the cab and the cargo storage of the vehicle, but may be formed, for example, on the side wall of the vehicle. Of course.

The hot air passage is formed in the double wall of the side wall, but this hot air passage is configured as an indirect structure directly inside the double wall or through a hot air pipe fixed to the double wall. Of course, you can do that. In addition, it goes without saying that the wall portion need not be a double wall in some cases.

Further, although the hot air outlet is formed in the lower part of the cargo storage, it may be formed in the middle part or the upper part, and is not limited to the lower part, but in consideration of the rising hot air, the lower part Is preferred. In addition, the type and size of the cargo in the cargo storage,
Alternatively, it is needless to say that the positions, sizes, shapes, etc. of the hot air outlets and the air intakes can be changed to optimum states by, for example, shelves or the like formed in the cargo storage.

Further, the arrangement of the heating unit including the blower, the heat exchanger, the combustor, etc. is not necessarily limited to this arrangement, and may be arranged on the rear side of the rear wheel of the vehicle, for example, for large vehicles, For vehicles such as flat-row vehicles, the heating unit may be located on the roof, or for large vehicles consisting of a cab and a cargo hold, the heating unit may be located at the top between the cab and the cargo hold, ie on the roof. Furthermore,
The vehicle heat retention device according to the present invention is applied to a vehicle such as an automobile, but it is needless to say that it can be applied to a railway vehicle, a trailer, and the like. Of course, in some cases, the air circulation passage may be a circulation pipe having the same flow area.

Furthermore, as for humidity, the items loaded in the cargo hold,
For example, depending on the fresh food, vegetables, etc., it is of course possible to incorporate a humidifier such as an ultrasonic wave and adjust the humidity in relation to the temperature using a humidity sensor or the like.

Further, it is needless to say that the fan installed at the hot air outlet may be installed in any arrangement, for example, every other one and only one side, as long as the function of the air curtain can be achieved. Further, when it is necessary to stir the air in the room, it goes without saying that a fan for stirring the air can be installed in the upper part of the room.

〔The invention's effect〕

The vehicle heat retention device according to the present invention is configured as described above and has the following effects. That is, this vehicle heat retention device opens and closes the air intake port for air intake opened in the cargo storage and the air intake port for intake of outside air formed in the air circulation passage communicating with the air intake passage of the heating unit. A switching door is provided, and based on a signal from a door switch that detects the opening / closing of the opening / closing door mounted on the cargo storage, when the opening / closing door is closed, the switching door opens the air collecting port to open the air intake port. Since the switching door closes the air collecting port and opens the air intake port when the opening / closing door is opened, the switching door opens the air collecting port when the opening / closing door is closed. Then, the air intake is closed, and the warm air blown from the heating unit to the cargo storage through the air blower and the warm air outlet is introduced into the air circulation passage through the air collecting port, and is then introduced from the air intake passage to the heating unit. Circulation to It is therefore possible to perform efficient heat insulation.

Further, when the opening / closing door is opened, the switching door closes the air collecting port and opens the air intake port, and the warm air from the heating unit is blown to the cargo storage through the blower section and the warm air outlet. As the outside air is supplied to the heating unit from the air intake through the air circulation passage and the air intake passage, even if the opening / closing door is opened, the outside air is not sucked into the cargo storage, so the heat escapes and the indoor temperature drops. Can be prevented.

Further, at least a plurality of the hot air outlets are arranged in the height direction close to the opening / closing door of the vehicle, and the fans installed at the hot air outlets function as an air curtain, and It is possible to maintain a predetermined room temperature without letting out hot air.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an embodiment of a vehicle heat insulation device according to the present invention, FIG. 2 is a rear view of the vehicle of FIG. 1, and FIG.
Sectional drawing which shows the fan applied to the figure, FIG. 4 is the front view of FIG. 3, FIG. 5 is the side view which shows the conventional vehicle heat insulation box, and FIG. 6 is the vehicle heat insulation shown in FIG. It is a structure explanatory view showing a combustion device used for a warehouse. 1 ... Combustor, 2 ... Heat exchanger, 3 ... Open / close door, 4 ...
Indoor: 5 ... Air collection port, 7 ... Blower, 8 ... Blower section, 9 ... Distribution pipe, 10 ... Vehicle heat insulation device, 12 ... Warm air outlet, 13 ... Loading room, 14 ... Rear wheel, 15 ... Front wheel, 16 ...
… Cab, 17 …… Air intake passage, 18 …… Outer wall, 19 …… Inner wall, 20 …… Fan, 22 …… Small fan motor, 24 …… Blade, 25 …… Switching door, 26 …… Air intake, 27 ... Door switch.

Claims (2)

[Claims] 1. A vehicular heat retention apparatus having a heating unit including at least a combustor, a blower and a heat exchanger for supplying warm air to a cargo storage mounted on a vehicle, and a blower section connected to the heating unit. A plurality of hot air outlets that communicate with each other and that are opened in the cargo storage, a fan that is disposed in at least one of the hot air outlets, and an air inlet for air intake that is opened in the cargo storage. An air circulation passage communicating with the air collecting port and having an air intake for sucking outside air and communicating with the air suction passage of the heating unit; and one of the air collecting port and the air intake to the air circulation passage. It has a switching door that opens and closes the other, and a door switch that detects opening and closing of the opening and closing door mounted in the cargo storage, and the switching door is opened when the opening and closing door is closed based on a signal from the door switch. A vehicle characterized in that the air collecting port is opened to close the air intake port, and the switching door closes the air collecting port to open the air intake port when the opening / closing door is opened. Insulation device. 2. The heat insulation device for a vehicle according to claim 1, wherein the fan is arranged at the hot air outlet located in a height direction of a rear side portion of the vehicle.