JP2005257095A - Vehicle with gas cooler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that baggages are heated a little, as the warm air is accumulated in an upper space of a cold storage room 4 in loading and unloading work in a vehicle 1 with a gas cooler, the air flows in the direction opposite to the direction of an arrow B when a fan 3 is rotated (normal rotation) after a door 8 of the cold storage room is closed after the work, and the warm air takes a round while brought into contact with the baggages in the room to reach an evaporator, which heats a little the baggages. <P>SOLUTION: A temperature detector 11 is mounted for detecting a temperature of the upper space of the cold storage room. The loading and unloading work is performed in such a state that an engine is stopped for preventing environmental contamination, a battery switch 10 is turned on, and a freezer is operated after switching the power supply from the power of a vehicle power source to the power of a battery for freezer 7. The fan 3 is stopped during a time when the cold storage room is opened. When the door 8 of the cold storage room is closed after the work, and a detected temperature by the temperature detector 11 is higher than a set value, the stopped fan 3 is rotated backward. The air flows in the direction of the arrow B, and the air of the upper space is cooled by an evaporator 2 first, and then takes a round in the room. As the cooled air takes a round, the baggages are not heated by the air. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

    The present invention relates to a vehicle with a gas cooling device equipped with a cold storage chamber that cools room air with a refrigeration apparatus and freezes / refrigerates luggage.

A vehicle with a gas cooling device is a vehicle in which a cold room is mounted on a cargo bed, and is used, for example, to convey food such as vegetables and fish with high freshness.
FIG. 7 is a diagram illustrating an example of a conventional vehicle with a gas cooling device. In FIG. 7, 1 is a vehicle with a gas cooling device, 2 is an evaporator, 3 is a fan, 4 is a cold insulation chamber, 5 is a refrigerant pipe, 6 is a refrigeration unit, 7 is a battery for a refrigeration device (power supply device), and 8 is a cold insulation. A room door, 9 is a cold room door open / close detection switch, and 10 is a battery input switch. The battery input switch 10 is provided in the driver's seat. FIG. 7 (1) shows a state in which the cold room door 8 is closed. It is closed in this way while driving. FIG. 7 (2) shows a state in which the cold room door 8 is opened. When the vehicle is stopped and the luggage is taken in and out, it is opened in this way.
Each arrow indicates the air flow.

The refrigeration unit 6 contains a compressor (compressor) for compressing the refrigerant. The refrigeration apparatus battery 7 is a battery for operating the refrigeration apparatus (compressor or the like) when the engine is stopped. Recently, it has been required to stop the engine so as not to pollute the environment even if the time for stopping the vehicle and taking in and out the luggage is short. When the battery input switch 10 is turned on after the engine is stopped, power is supplied from the refrigeration apparatus battery 7.
The refrigerant compressed by the refrigeration unit 6 is sent to the evaporator 2 through the refrigerant pipe 5 and is evaporated here. During evaporation, the air is cooled because it takes heat away from the surrounding air. The cooled air is blown out as indicated by arrow A by the fan 3 and circulates in the cold insulation chamber 4 to cool the load.

As a power source for operating the refrigeration apparatus, the electric power generated by the engine is used when the vehicle engine is rotating (vehicle power supply), and the refrigeration apparatus battery 7 is used when the engine is stopped. .
However, if the fan 3 is operated and air is blown as shown by the arrow A while the cold room door 8 is opened and the baggage is taken in and out, the cold air at the corner is positively driven out of the room. . In such a case, there has been proposed one that stops the blowing of the fan 3 (Japanese Patent Laid-Open No. 2003-214747).
Specifically, a cold room door open / close detection switch 9 is provided near the cold room door 8 so that the operation of the fan 3 is stopped when it is detected that the cold room door 8 is open. That way, at least the cold will not be actively expelled.
JP-A-10-160320 JP 2000-283622 A JP 2002-130889 A JP 2002-130891 A JP 2003-214747 A

  In the above-described conventional vehicle with a gas cooling device, warm air gradually accumulates in the upper space of the cold storage chamber 4 when the loading / unloading operation of the luggage performed with the cold chamber door 8 open is prolonged. This is because the cold air in the cool room 4 is heavier than the outside air and there are movements of people and luggage, so as shown by the arrows in FIG. This is because light external air enters from above and accumulates in the upper space of the cold chamber 4.

Therefore, when the cold insulation chamber door 8 is closed after the work is completed, a large lump of warm air may exist in the upper space of the cold insulation chamber 4. When the operation of the fan 3 is started in this state, the warm air is made to go round the room as indicated by the arrow in FIG. That is, it is first driven to the cold room door 8, then descends downward, flows forward near the floor, and rises toward the evaporator 2. Then, it is cooled gradually and sent out as cool air through the fan 3.
As described above, the warm air accumulated in the upper space while the cold room door 8 is opened, when the normal cooling operation was resumed, first touched the loaded cargo in a rounded manner in order. After being warmed, the bag is gradually cooled, so that there is a problem that the luggage is warmed by one round.
An object of the present invention is to solve the above problems.

In order to solve the above-mentioned problems, in the present invention, a refrigeration apparatus including an evaporator and a fan attached to the upper front part of a room is equipped with a door provided at the rear part and a power supply from a vehicle power source. In a vehicle with a gas cooling device comprising a power supply device for a refrigeration apparatus that can operate the refrigeration apparatus independently when the refrigeration apparatus is stopped, a temperature detector that detects the temperature of the upper space of the cold storage room; A temperature discriminating unit that discriminates whether or not the temperature detected from the temperature detector is equal to or higher than a set temperature, a reverse rotation permission switch that is operated by an output from the temperature discriminating unit, and a cold insulation that detects opening and closing of the cold insulation chamber door A door opening / closing detection switch, and when power is supplied from the vehicle power supply, the fan is rotated forward so that cooling air is sent to the rear of the cold storage room, and power is supplied from the power supply device for the refrigeration apparatus, and the reverse rotation The operation corresponding to the time permission switch is equal to or higher than the set temperature, and the cold compartment door closing detecting switch when it detects the closing of the door was that it comprises a fan motor control circuit for controlling so as to reverse the rotation of the fan.

  In the vehicle with the gas cooling device as described above, the number of temperature detectors is not one, but the first temperature detector that detects the temperature of the upper space of the cold storage chamber and the temperature of the lower space of the cold storage chamber. The second temperature detector is used as a second temperature detector, and it is determined whether or not the difference between the detected temperatures from the first temperature detector and the second temperature detector is equal to or higher than the set temperature instead of the temperature determining unit. It is good also as a temperature difference discrimination | determination part to perform. Of course, it is good also as a temperature discrimination | determination part which discriminate | determines together each temperature and a temperature difference.

  In addition, it is equipped with a refrigeration system including an evaporator and a fan attached to the upper front part of the room, and has a cooler room provided with a door at the rear, independently when power supply from the vehicle power supply is stopped In a vehicle with a gas cooling device that includes a power supply device for a refrigeration device that can operate the refrigeration device, a reverse rotation permission switch that is manually turned on and off, and a cold chamber door opening / closing that detects opening / closing of the cold chamber door When the power is supplied from the detection switch and the vehicle power supply, the fan is rotated forward so as to send cooling air to the rear of the cold storage chamber, and the reverse rotation permission switch is turned on when power is supplied from the power supply device for the refrigeration apparatus. And a fan motor control circuit for controlling the fan to reversely rotate when the cold insulation door open / close detection switch detects that the door is closed. There.

According to the vehicle with a gas cooling device of the present invention, the engine is stopped to prevent environmental pollution, and the fan is stopped when the power supply to the refrigeration device is switched to the battery for the refrigeration device and the luggage storage / removal operation is performed. Let me. When a predetermined condition is satisfied when the work is finished and the cold chamber door is closed, the fan attached to the evaporator is reversely rotated. As a result, warm air accumulated in the upper space of the cold room is first cooled by an evaporator. Therefore, it is possible to prevent the loaded luggage from being warmed by the warm air.
Specifically, it is as follows.
(1) According to the invention of claim 1, when the cold room door is closed and the temperature of the upper space of the cold room is equal to or higher than the set value, the fan is reversely rotated to suck the upper air and cool by the evaporator. To do.
(2) According to the invention of claim 2, when the cold room door is closed, if the difference between the temperature of the upper space of the cold room and the temperature of the lower space is not less than the set value, Inhale air and cool with an evaporator.
(3) According to the invention of claim 3, when the cold room door is closed, by turning on the manual reverse rotation permission switch, the fan is reversely rotated to suck the air in the upper portion and cool by the evaporator.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram showing a vehicle with a gas cooling device according to a first embodiment of the present invention. The reference numerals correspond to those in FIG. 7, and 11 is a temperature detector. The temperature detector 11 is for detecting the temperature of the upper space of the cold insulation chamber 4, and is attached to the ceiling or the upper part of the side wall.
First, an outline of the operation will be described. When the vehicle stops, the engine is stopped to prevent environmental pollution (the key switch is turned off), and the power to the refrigeration apparatus is switched to the refrigeration apparatus battery 7 by turning on the battery input switch 10. However, the fan 3 is prevented from rotating only by turning on the battery input switch 10. Accordingly, the fan 3 that has been rotating forward is stopped.

In this state, the cold room door 8 is opened, and the loading and unloading work is performed. As long as the cold room door 8 is opened, the fan 3 is stopped.
When the cold chamber door 8 is closed after finishing the work, if the temperature detected by the temperature detector 11 is higher than the preset temperature, the fan 3 that has stopped is rotated in the reverse direction, and the air in the upper space is moved to the arrow B. The air is sucked and cooled in the direction (when the detected temperature becomes lower than the set temperature, the fan 3 is stopped).
Then, the warm air accumulated in the upper space is cooled by the evaporator 2 before touching the load stacked below, and is touched to the load after being blown down. Accordingly, there is no adverse effect of touching the luggage while warm air and raising the temperature of the luggage.

Details of the above operation will be described with reference to FIGS.
FIG. 3 is a block diagram of a main part of a vehicle with a gas cooling device according to the present invention, in which 20 is an on-vehicle generator, 21 is an engine, 22 is a transmission, 23 is a propeller shaft, 24 is a main part of a refrigeration apparatus, and 25 is Compressor, 26 PTO (Power Take Off), 27 Motor generator, 28 Transfer, 29 Key switch, 30 On-board battery, 31 Inverter, 32 Rectification protection circuit, 33 Commercial power terminal, 34 Lifting Voltage circuit 35: DC-DC converter 36: Converter output power line (battery power supply for refrigeration equipment) 37: Vehicle power line (engine power supply) 38: Fan motor control circuit 39: Fan motor 40: Reverse rotation It is a permission switch.

The main part 24 of the refrigeration apparatus includes a compressor 25, an evaporator 2 and a fan 3. The refrigerant compressed by the compressor 25 is sent to the evaporator 2 through the refrigerant pipe 5 and evaporates here. The surrounding air is cooled during evaporation, and the cooling air is diffused and circulated by the fan 3 into the cold insulation chamber. The fan 3 is rotated by a fan motor 39 in the lower part of FIG.
The force for driving the compressor 25 is obtained from the engine 21 through the PTO 26 when the engine 21 is rotating, and is obtained from the motor generator 27 when the engine 21 is stopped. The motor generator 27 is rotated by the refrigeration apparatus battery 7 or a commercial power source.

That is, when the engine 21 is rotating, the rotational force is obtained through the route of the engine 21 → the transmission 22 → the PTO 26 → the transfer 28 → the compressor 25. When the motor generator 27 is rotated, the rotational force is obtained through the route of the motor generator 27 → transfer 28 → compressor 25.
In a place where commercial power is available (for example, a shipping source or a distribution center), the commercial power is connected to the commercial power terminal 33. The AC of the commercial power source is first converted to DC by the rectification protection circuit 32 and then converted to AC suitable for driving the motor generator 27 by the inverter 31.
Although not shown in order to avoid complication of the figure, a direct current having an appropriate voltage value after rectification is supplied to the fan motor control circuit 38 via the vehicle power supply line 37 and the fan motor 39 (fan 3) Rotate forward.
When using the battery 7 for refrigeration equipment, the battery input switch 10 is first turned on. The voltage of the battery 7 for the refrigeration apparatus is transformed to an appropriate voltage value by the step-up / down voltage circuit 34, converted into alternating current by the inverter 31, and supplied to the motor generator 27.

The fan motor 39 is driven by a power source (the on-vehicle generator 20 or the on-vehicle battery 30) supplied via the vehicle power line 37 when the key switch 29 is turned on. When the key switch 29 is turned off and the battery insertion switch 10 is turned on, the key switch 29 is driven by power supplied from the refrigeration apparatus battery 7 via the converter output power line 36.
The reverse rotation permission switch 40 is a switch that enables reverse rotation of the fan motor 39 when turned on. In the case of the first embodiment, it is turned on when the temperature detected by the temperature detector 11 becomes higher than the set temperature. The battery charging switch 10 connects the refrigeration battery 7 and the input side of the DC-DC converter 35, and the reverse rotation permission switch 40 connects the output side of the DC-DC converter 35 and the fan motor control circuit 38. It is arranged.
That is, in the fan motor control circuit 38 according to the present invention, when a predetermined condition is satisfied in a situation where the battery 7 for the refrigeration apparatus is used, the stopped fan motor 39 is reversely rotated. By being reversely rotated, an air flow in the direction of arrow B in FIG. 1 is generated. This is the main feature of the present invention.

Next, details of the fan motor control circuit 38 will be described.
FIG. 4 is a diagram illustrating the fan motor control circuit 38 according to the first embodiment. The reference numerals correspond to those in FIG. 3, 50 is a normally closed relay, 51 is a relay contact, 52 is a relay coil, 53 is a normally closed relay, 54 is a relay contact, 55 is a relay coil, 56 is a normally open relay, 57 is Relay coil, 58 relay contact, 59 normally open relay, 60 relay coil, 61 relay contact, 62 normally closed relay, 63 relay contact, 64 relay coil, 65 temperature discriminating section, 66 ground line It is.
The cold chamber door open / close detection switch 9 is a switch that is turned off when the cold chamber door 8 is opened and turned on when the cold chamber door 8 is closed.

In the normally closed relay 50, the relay contact 51 is inserted in series with the converter output power line 36, and the relay coil 52 is connected to the vehicle power line 37. Therefore, as long as the vehicle power supply is alive, the relay coil 52 is energized from the vehicle power supply line 37 and the relay contact 51 is turned off. When the vehicle power supply is dead and the energization from the vehicle power supply line 37 is stopped, the relay contact 51 is turned back on. Therefore, the normally closed relay 50 serves to detect whether or not power is supplied from the vehicle power line 37. When the vehicle power source is dead and the relay contact 51 is turned on, power can be supplied from the converter output power line 36 to the fan motor control circuit 38 for the first time.
The temperature discriminating unit 65 discriminates whether or not the temperature detected by the temperature detector 11 is equal to or higher than a preset temperature set in advance, and when it is higher, a signal for turning on the reverse rotation permission switch 40 is given. To emit.

(1) Operation when power is supplied from the vehicle power line 37 In this case, the normally closed relay 50 is turned off as described above. Further, the battery input switch 10 in FIG. 1 is not turned on.
The electric power supplied from the vehicle power supply line 37 causes a current in the direction of arrow C to flow through the fan motor 39 through the path of the vehicle power supply line 37 → the normally closed relay 53 → the fan motor 39 → the normally closed relay 62 → the earth line 66. When flowing in this direction, the fan motor 39 rotates forward (air flows in the direction of arrow A in FIG. 7).

The energization of the relay coils of the normally closed relay 53, the normally open relay 59, the normally open relay 56 and the normally closed relay 62 is performed when the following three conditions are satisfied. Not satisfied. Therefore, the ON / OFF states of the contacts of each relay are as shown in FIG. 4 (only the relay contacts 54 and 63 are ON).
First ... Battery input switch 10 is turned on (power is supplied to converter output power line 36)
Second: The normally closed relay 50 is turned on (in other words, the vehicle power line 37 is turned off).
Third: Reverse rotation permission switch 40 is turned on (temperature detected by temperature detector 11 is greater than a predetermined value)

(2) Operation when power is supplied from converter output power supply line 36 Power supply from converter output power supply line 36 is after power supply from vehicle power supply line 37 is stopped (key switch 29 in FIG. 3 is turned off). To do. When the power supply from the vehicle power supply line 37 is stopped, the rotation stops because the current to the fan motor 39 disappears. Further, the relay contact 51 of the normally closed relay 50 in FIG. 4 is turned back on.
3 is turned on in this state, the refrigeration apparatus battery 7 in FIG. 3 is connected to the DC-DC converter 35, and power supply from the converter output power line 36 is started. However, since the relay coil of each relay is not energized while the reverse rotation permission switch 40 is off, the state of each relay contact is as illustrated. When the cold room door 8 is opened to load / unload the baggage, the cold room door open / close detection switch 9 is turned off.

When the power supply from the converter output power line 36 is started, the state of each relay contact is as described above. However, in this state, a path for energizing the fan motor 39 is not yet formed (because the reverse rotation permission switch 40 is off), and the fan motor 39 remains stopped.
Among these, when the temperature detected by the temperature detector 11 (the temperature of the upper space of the cold insulation chamber 4) is equal to or higher than the temperature set by the temperature determination unit 65, the reverse rotation permission switch 40 is turned on. With this ON, the relay coils of the normally closed relay 53, the normally open relay 59, the normally open relay 56, and the normally closed relay 62 are energized, and the ON / OFF states of the relay contacts are opposite to those shown in the figure. That is, the relay contacts 54 and 63 of the normally closed relays 53 and 62 are turned off, and the relay contacts 58 and 61 of the normally open relays 56 and 59 are turned on.

As a result, an energization path is formed from the converter output power line 36 to the relay contact 58 (normally open relay 56) → the fan motor 39 → the relay contact 61 (normally open relay 59). However, as long as the cold room door 8 is open, the cold room door open / close detection switch 9 is off, so that the energization path to reach the ground line 66 is not completed, and the fan motor 39 is still stopped.
When the storage room door 8 is closed after the loading and unloading operation is completed, the storage room door open / close detection switch 9 is turned on, and the energization path to the fan motor 39 is completed. Here, the fan motor 39 is energized, and the direction of the current is the direction of the arrow D, which is the opposite direction to that during forward rotation. Accordingly, the fan motor 39 (fan 3) rotates in the reverse direction (air flows in the direction of arrow B in FIG. 1).

As described above, in order to prevent environmental pollution, the engine of the vehicle 1 with the gas cooling device is stopped and the cold storage room door 8 is opened in the state of switching to the refrigeration device battery 7 to carry in and out the luggage. However, at the time when the work is completed and the cold room door 8 is closed, the temperature of the air in the upper space of the cold room 4 is checked. If it is higher than the set temperature, the fan motor 39 is reversely rotated, and the warm air in the upper space is first sucked into the evaporator and cooled before touching the load. This prevents the temperature of the load from rising.
This reverse rotation is continued until one of the following times.
First: When the temperature has decreased to the extent that the reverse rotation permission switch 40 is turned off Second: When the power supply from the converter output power supply line 36 is stopped (battery input switch 10 is turned off) Battery input switch When 10 is turned off and power supply from the vehicle power line 37 is started again, the fan motor 39 starts to rotate forward.
Note that the duration of the reverse rotation can be set to a fixed time from the time when the cold room door 8 is closed by using a delay circuit (timer circuit) (the circuit is turned off after the time has elapsed). By).

(Second Embodiment)
FIG. 2 is a diagram showing a vehicle 1 with a gas cooling device according to a second embodiment of the present invention. Reference numerals correspond to those in FIG. 1, and 12 is a temperature detector.
The difference from the first embodiment is that, in addition to the temperature detector 11 provided in the upper part in the cold insulation chamber 4, another temperature detector 12 is provided in the lower part in the cold insulation chamber 4. Thus, the “difference” in the detected temperature is monitored. The description of the same components as in the first embodiment is the same as in the first embodiment, and will be omitted.
If the temperature difference is equal to or greater than the set value when the storage compartment door 8 is closed after the loading / unloading operation, the fan 3 is rotated in the reverse direction so that air flows in the direction indicated by the arrow B (the direction in which the air is sucked into the evaporator 2). .

FIG. 5 is a diagram illustrating a fan motor control circuit 38 according to the second embodiment. Reference numerals correspond to those in FIGS. 2 and 4, and reference numeral 68 denotes a temperature difference determination unit. The circuit operation is almost the same as in FIG. The difference is how the reverse rotation permission switch 40 is turned on. The temperature difference determination unit 68 determines whether or not the difference between the detected temperatures of the temperature detectors 11 and 12 is equal to or greater than a preset set value. The reverse rotation permission switch 40 is turned on when the set value is exceeded, and is turned off when the switch is lower than the set value.
The operation after the loading / unloading operation is completed is the same as in the first embodiment.

(Third embodiment)
FIG. 6 is a diagram showing a fan motor control circuit 38 according to the third embodiment, and the reference numerals correspond to those in FIG. The description of the same components as in the first embodiment is the same as in the first embodiment, and will be omitted.
The third embodiment is different from the first and second embodiments in that the reverse rotation permission switch 40 is a manual switch. In this case, the reverse rotation permission switch 40 may be provided in the driver's seat or may be provided near the cold room door 8.

When the loading / unloading operation is started, the reverse rotation permission switch 40 is turned off, and the cold room door 8 is opened (cold room door open / close detection switch 9 is turned off). Then, the fan motor 39 stops. When the work is finished, the cold chamber door 8 is closed and the reverse rotation permission switch 40 is turned on. Then, the fan motor 39 starts reverse rotation.
The reverse rotation can be stopped in various ways. After a while, the reverse rotation permission switch 40 may be turned off, or the battery insertion switch 10 may be turned off (power supply from the converter output power line 36 is stopped).

In each of the above-described embodiments, the cold chamber door opening / closing detection switch 9 is described as a switch that is turned off when the cold chamber door 8 is opened and turned on when the cold chamber door 8 is closed. It is also possible to use it. In that case, in short, the circuit configuration may be changed so that the reverse rotation current flows through the fan motor 39 when the cold chamber door 8 is closed.
As the reverse rotation permission switch 40, a switch that is turned on and off in the opposite direction may be used. Even in such a case, the circuit configuration may be changed so that a current for inverting each relay contact can flow when a predetermined condition such as temperature is satisfied.

The figure which shows the vehicle with the gas cooling device of the 1st Embodiment of this invention. The figure which shows the vehicle with the gas cooling device of the 2nd Embodiment of this invention. Main part block block diagram of vehicle with gas cooling device of this invention The figure which shows the fan motor control circuit of 1st Embodiment. The figure which shows the fan motor control circuit of 2nd Embodiment. The figure which shows the fan motor control circuit of 3rd Embodiment. The figure which shows the vehicle with the conventional gas cooling device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle with gas cooling device, 2 ... Evaporator, 3 ... Fan, 4 ... Cold storage chamber, 5 ... Refrigerant piping, 6 ... Refrigerating device unit, 7 ... Battery for freezing device, 8 ... Cold storage chamber door, 9 ... Cold storage chamber door Open / close detection switch, 10 ... Battery input switch, 11, 12 ... Temperature detector, 20 ... In-vehicle generator, 21 ... Engine, 22 ... Transmission, 23 ... Propeller shaft, 24 ... Main part of refrigeration system, 25 ... Compressor, 26 ... PTO, 27 ... Motor generator, 28 ... Transfer, 29 ... Key switch, 30 ... In-vehicle battery, 31 ... Inverter, 32 ... Rectification protection circuit, 33 ... Commercial power supply terminal, 34 ... Boosting voltage circuit, 35 ... DC-DC Converter, 36 ... Converter output power line, 37 ... Vehicle power line, 38 ... Fan motor control circuit, 39 ... Fan motor, 40 ... Reverse rotation permission switch, 50 ... Always Relay, 51 ... Relay contact, 52 ... Relay coil, 53 ... Normally closed relay, 54 ... Relay contact, 55 ... Relay coil, 56 ... Normally open relay, 57 ... Relay coil, 58 ... Relay contact, 59 ... Normally open relay, 60 ... Relay coil, 61 ... Relay contact, 62 ... Normally closed relay, 63 ... Relay contact, 64 ... Relay coil, 65 ... Temperature discrimination part, 66 ... Earth line

Claims (3)

A cold storage room equipped with a refrigeration apparatus including an evaporator and a fan attached above the front part of the room, and provided with a door at the rear part;
In a vehicle with a gas cooling device comprising a power supply device for a refrigeration apparatus capable of operating the refrigeration apparatus independently when power supply from the vehicle power supply is stopped,
A temperature detector for detecting the temperature of the upper space of the cold storage chamber;
A temperature discriminating unit for discriminating whether or not the detected temperature from the temperature detector is equal to or higher than a set temperature;
A reverse rotation permission switch that is activated by an output from the temperature determination unit, and a cold insulation chamber door open / close detection switch that detects opening and closing of the cold insulation chamber door;
When power is supplied from the vehicle power source, the fan is rotated forward so that cooling air is sent to the rear of the cold room, and power is supplied from the battery for the refrigeration device, and the operation corresponding to when the reverse rotation permission switch is equal to or higher than a set temperature. And a fan motor control circuit for controlling the fan to reversely rotate when the cold insulation door opening / closing detection switch detects that the door is closed. A cold storage room equipped with a refrigeration apparatus including an evaporator and a fan attached above the front part of the room, and provided with a door at the rear part;
In a vehicle with a gas cooling device comprising a power supply device for a refrigeration apparatus capable of operating the refrigeration apparatus independently when power supply from the vehicle power supply is stopped,
A first temperature detector for detecting the temperature of the upper space of the cold room;
A second temperature detector for detecting the temperature of the lower space of the cold room;
A temperature difference determination unit for determining whether or not a difference between detected temperatures from the first temperature detector and the second temperature detector is equal to or greater than a set temperature difference;
A reverse rotation permission switch operated by an output from the temperature difference determination unit;
A cold room door open / close detection switch for detecting opening and closing of the cold room door;
When power is supplied from the vehicle power supply, the fan is rotated forward so that cooling air is sent to the rear of the cold storage chamber, and power is supplied from the power supply device for the refrigeration device, and the reverse rotation permission switch corresponds to when the temperature difference is greater than a set temperature difference. And a fan motor control circuit for controlling the fan to reversely rotate when the cold insulation door opening / closing detection switch detects that the door is closed. A cold storage room equipped with a refrigeration apparatus including an evaporator and a fan attached above the front part of the room, and provided with a door at the rear part;
In a vehicle with a gas cooling device comprising a power supply device for a refrigeration apparatus capable of operating the refrigeration apparatus independently when power supply from the vehicle power supply is stopped,
A reverse rotation permission switch that is manually turned on and off;
A cold room door open / close detection switch for detecting opening and closing of the cold room door;
When power is supplied from the vehicle power source, the fan is rotated forward so as to send cooling air to the rear of the cold insulation chamber, and the power supply from the power supply device for the refrigeration apparatus is supplied, the reverse rotation permission switch is turned on, and the cold insulation A vehicle with a gas cooling device, comprising: a fan motor control circuit that controls the fan to rotate in reverse when the door opening / closing detection switch detects the closing of the door.

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