JP2020046095A - Portable type refrigerator - Google Patents

Abstract

To provide a portable type refrigerator capable of stably loading light vehicles including a motor cycle, a bicycle and a rear-car, and performing cooling with a high capacity and high efficiency.SOLUTION: A portable type refrigerator comprises a heat pump system 15 which includes: a power supply device 5 capable operating by electric power supply at least from a direct current power source 17; a motor 6 rotatably driven by electric power supply from the power supply device; a compression pump 7 compressing a cooling medium by the rotation force of the motor; a condenser 8 for cooling the compressed cooling medium; and a carbureter 9 for absorbing heat by the expanded cooling medium. The carbureter is arranged at a position thermally coupled to a refrigeration storage chamber, and heavy members of the heat pump system 15 excluding the carbureter are arranged in an exterior package 4 below the refrigeration storage chamber. Vent holes 20, 21, 23, 24, 25 are opened in exterior packages on a front side F and a rear side R in a vehicle advancing direction, and the condenser is arranged in a fresh air insertion flow channel 16 formed between both vent holes 20, 21, 23.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a portable refrigerator that can be stably mounted on a vehicle and has good thermal efficiency.

  Conventionally, an absorption refrigerator using a heat pump has been used, and it has been put to practical use. Further, as disclosed in Patent Document 1, a portable refrigerator mounted on a vehicle to cool drinks and the like has been invented and put to practical use.

  The portable refrigerator is integrally provided with a cooling cycle system incorporating a small scroll compressor that compresses and circulates a refrigerant in a refrigerator case having heat insulating properties to accommodate the object to be refrigerated. The compressor includes a compressor, a condenser, an expansion valve, an evaporator (vaporizer), and a power supply device for supplying power to the compressor.

  Since the portable refrigerator having the above configuration is placed on a stable surface such as a seat or a foot of an automobile, the portable refrigerator can be stably placed even if it has a heavy cooling cycle system. Also, since the seats and feet of the car are almost flat, the bottom of the portable refrigerator is naturally formed to be flat to improve the stability at the time of installation. Often formed on the top. Further, the condenser was exposed to the outside in order to improve the heat radiation efficiency.

JP 2003-279218 A

  However, a portable refrigerator having a relatively heavy cooling cycle system can be easily installed in a space having a roof and a flat surface such as in a car, but is lightweight and unstable such as a motorcycle or a bicycle. When mounted on a vehicle, the weight balance was easily lost, and caution was required when driving. In particular, as the capacity of the refrigerator increases, the load of the object to be kept cool, such as perishables, is added, and it is more important to maintain the weight balance.

  Also, if the condenser is placed inside the car, it is desirable to form it on the side or top surface that is easily exposed to the outside air.However, when it is mounted on a bed that is basically installed outdoors, such as a motorcycle or bicycle, In order to protect the delicate pipes that serve as refrigerant passages from damage due to external collisions, they must be housed in an exterior (case) that has enough rigidity to withstand external physical collisions. However, it was inevitable that this exterior would cause a decrease in cooling efficiency.

  In addition, refrigerators placed outdoors, such as those mounted on vehicles such as motorcycles, bicycles, and rear cars, raise the temperature of the condenser because the surface temperature rises when exposed to direct sunlight, lowering the cooling efficiency. Was invited. In particular, when a refrigerator is provided with a cooling cycle system on the top surface, it is inevitable that the cooling efficiency is significantly reduced.

  In addition, the larger the capacity of the refrigerator storage is, the larger the cooling cycle system that cools it cannot be avoided. Deterioration becomes a problem, and there is a problem that it becomes more difficult to improve the cooling efficiency.

  The present invention has been made in consideration of the above circumstances, and can be stably mounted on a light vehicle including a motorcycle, a bicycle, and a rear car, and can perform large-capacity and high-efficiency cooling. It is intended to provide a portable refrigerator.

  In order to solve the above-mentioned problems, a first invention is directed to a refrigerated storage room having an insulated structure capable of storing an object to be kept cool, a door having an insulated structure capable of opening and closing the refrigerated storage room, and withstanding an external shock. A portable refrigerator which can be mounted on a vehicle, comprising: a power supply device operable at least by power supply from a DC power supply; a motor driven to rotate by power supply from the power supply device; and a rotational force of the motor. A heat pump system comprising a compression pump that compresses the refrigerant by a compressor, a condenser that cools the compressed refrigerant, and a vaporizer that absorbs heat by the expanded refrigerant, wherein the vaporizer is thermally connected to the refrigerator compartment. And a heavy heat pump system member other than the vaporizer is disposed in the exterior below the refrigeration compartment, and the vehicle travels in the direction of travel of the vehicle. In a square and behind the exterior with are opened vent provides portable refrigerator, characterized in that are the condenser is disposed to the outside air through flow path formed between the two vents. (Claim 1)

  The refrigeration compartment can open and close the cold storage object by opening its door. Since both the refrigeration compartment and the door have a heat insulating structure, when the door is closed, the refrigeration compartment is heated from outside by the outside. The cold insulation state can be maintained by shutting it off. The heat insulating structure may be a heat insulating material interposed between the inside of the refrigerator compartment and the exterior and / or an air layer or a vacuum layer formed to prevent heat transfer.

  The power supply device receives electric power supplied from a DC power supply and supplies appropriate electric power to a motor and the like. Although the DC power supply may be a secondary battery such as an existing battery mounted on the vehicle, another secondary battery not involved in the running of the vehicle may be used as the DC power supply. Alternatively, a DC power supply such as a solar battery or a primary battery may be used. In addition, the power supply device may be capable of supplying power from not only a DC power supply but also an AC power supply such as a commercial power supply depending on a place where the portable refrigerator is installed.

  A compression pump rotationally driven by the motor compresses the refrigerant and supplies the compressed refrigerant to the condenser. The condenser can cool and condense the refrigerant whose temperature has risen by being compressed by the airflow flowing in the outside air passage. The cooled refrigerant expands due to the reduced pressure when flowing through the vaporizer, absorbs the heat in the refrigerated storage chamber thermally connected to the vaporizer, and is sent to the compression pump again. The thermal connection between the vaporizer and the refrigeration compartment may be achieved by connecting the inner wall of the refrigeration compartment and the piping of the carburetor with a metal such as heat conductive aluminum. An air circulation mechanism that circulates air in the cooling storage chamber may be provided in an air flow path that communicates between them.

  The heat pump system having the above configuration can compare the temperature in the refrigerated storage room with the outside air and cool the temperature to a low temperature by the temperature difference between the evaporation temperature and the condensation temperature when the pressure of the refrigerant is changed. The compression pump, the condenser, and the vaporizer are extremely delicate structures because they constitute a piping flow path through which the refrigerant flows without leaking, but the heat pump system of the present invention is formed inside the exterior. Therefore, in a vehicle such as a motorcycle, a bicycle, or a rear car that is basically installed outdoors, it is possible to prevent a delicate heat pump system from being damaged by collision of an article from the outside of the portable refrigerator. In particular, by arranging the condenser inside the exterior, the condenser is not exposed to direct sunlight, and the cooling efficiency can be increased accordingly.

  Since the heavy objects constituting the heat pump system are arranged inside the outer package below the refrigeration compartment, the center of gravity of the portable refrigerator can be lowered, and the sense of stability can be improved accordingly. In addition, the refrigerated storage chamber can be formed by using the upper space in the exterior as much as possible, and the capacity can be easily increased.

  Ventilation holes provided on the front and rear exteriors in the traveling direction of the vehicle serve as intake and exhaust ports for the outside air, respectively. Can be drawn in to allow the passage of the outside air passage. However, an intake fan and / or an exhaust fan may be separately provided in the ventilation opening in the front or rear in the traveling direction of the vehicle to force the outside air into the outside air passage.

  The condenser may further improve the cooling efficiency by providing cooling fins made of metal such as aluminum having excellent heat conduction along the outside air passage. The portable refrigerator of the present invention also includes a portable refrigerator by changing the operation rate of the heat pump system. Further, it goes without saying that the refrigerator compartment may be formed by partitioning the refrigeration compartment and the frozen compartment.

  It is preferable that the power supply device be capable of supplying power not only from a secondary battery but also from a commercial power supply. That is, in a state where the portable refrigerator is unloaded from the vehicle and placed at the base, it is preferable that the refrigerator compartment can be kept cool using a commercial power supply.

  The exterior is provided with left and right legs forming a recess therebetween by protruding downward so as to straddle a motorcycle or bicycle carrier on the left and right, so that each member constituting the heat pump system maintains a weight balance. In the case of being inserted into the left and right legs in a distributed state (claim 2), heavy objects are concentrated on the left and right legs formed to protrude downward so as to straddle a motorcycle or bicycle carrier. Thus, the stability of the portable refrigerator mounted on the bed of the vehicle is improved, and the center of gravity can be formed as low as possible.

  In other words, even when mounted on a relatively light vehicle such as a motorcycle or a bicycle, the effect on the overall weight balance can be minimized, and it is possible to contribute to an improvement in stability during traveling. In addition, since the heavier members are arranged below even when the object to be kept cool is stored in the refrigerated storage room, the weight balance is lost by minimizing the height of the center of gravity as much as possible. From falling down.

  In the case where an auxiliary secondary battery that can be inserted into the outer casing or can be engaged with the outer casing and is capable of supplying power to the power supply device is provided (claim 3), the auxiliary secondary battery can be provided without relying on power supply from another secondary battery. Cold storage of the refrigerator compartment can be performed by power supply from the secondary battery. In other words, in the case of a motorcycle, the secondary battery used for starting the vehicle is already mounted, but the power supply from the auxiliary secondary battery is prioritized without supplying the power from the secondary battery for the vehicle. By using it, a load is not applied to a portion related to the running of the vehicle.

  By preferentially using the auxiliary secondary battery in this way, the secondary battery mounted on the vehicle can be protected, but when it is difficult to keep the temperature inside the refrigeration compartment simply by supplying power from the auxiliary secondary battery. In this case, power may also be supplied from a secondary battery mounted on the vehicle to enable more powerful cooling.

  A separate secondary battery is prepared when the portable refrigerator is mounted on a vehicle that does not normally have a secondary battery, such as a bicycle or a rear car, by allowing an auxiliary secondary battery to be inserted into the exterior. Instead, only the auxiliary secondary battery can be used as a power source for the portable refrigerator. Since the position where the auxiliary secondary battery is inserted or fitted is at the lower part of the portable refrigerator, the center of gravity can be set at a lower position, and the stability is improved accordingly.

  When an auxiliary secondary battery that can be fitted into the recess between the legs and is capable of supplying power to the power supply device is provided (Claim 4), the legs are required when the portable refrigerator is arranged on a flat surface such as a rear car. It is possible to stably mount not only the part but also a heavy object such as an auxiliary secondary battery fitted in the concave part.

  The power supply device can be operated by power supply from a commercial power supply, and when the auxiliary secondary battery can be charged in a power supply state from the commercial power supply (claim 5), the portable refrigerator is taken down from the vehicle. In a state where the power supply device is connected to the commercial power supply while being placed at the base, it is possible to perform cooling of the refrigerated storage room by supplying power from the commercial power supply and charge the auxiliary secondary battery to prepare for the next movement. .

  As described above, according to the present invention, when mounted on a vehicle without a roof, the object to be kept cool can be efficiently cooled even if it is placed in a state exposed to direct sunlight, and high speed can be achieved in the open state. Not only does it have sufficient strength to respond to external collisions when moving, but it also effectively utilizes the airflow generated during movement to efficiently cool cold storage objects stored in a large-capacity refrigerated storage room It is possible to provide a portable refrigerator having a good weight balance that is less likely to fall or fall from the vehicle when mounted on a light vehicle including a motorcycle, a bicycle, and a rear car.

It is a perspective view showing the whole portable refrigerator concerning an embodiment of the present invention. It is a front view which shows the portable refrigerator of the said embodiment partially transparently. It is a side view which shows the portable refrigerator of the said embodiment partially transparently. It is a top view which shows the portable refrigerator of the said embodiment partially transparently. It is a block diagram which shows the connection state of each part of the portable refrigerator of the said embodiment. It is a figure showing the state where the portable refrigerator was mounted in the bed of a motorcycle. It is a figure which shows the modification of the said portable refrigerator.

  Hereinafter, the configuration of the portable refrigerator 1 according to the first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, a portable refrigerator 1 of the present invention has a refrigerated storage room 2 of an insulated structure capable of storing an object to be kept cool, a door 3 of an insulated structure capable of opening and closing the refrigerated storage room 2, and an exterior. And an exterior 4 that can sufficiently withstand the impact from the vehicle. It should be noted that the specific configuration shown in the following embodiment is merely an example shown to explain the features of the present invention, and the present invention is not limited to the components and the arrangement shown in the embodiment. Needless to say.

  As shown in FIGS. 2 to 5, the portable refrigerator 1 includes a power supply device 5 operable by at least power supply from a DC power supply, a motor 6 that is driven to rotate by power supply from the power supply device 5, A compression pump 7 for compressing the refrigerant by rotational force, a condenser 8 for cooling the compressed refrigerant, a vaporizer 9 for absorbing heat by the expanded refrigerant, and a gas pump 9 interposed between the condenser 8 and the vaporizer 9. A pressure reducing valve 10 for reducing the pressure of the refrigerant, a temperature sensor 11 for measuring the temperature in the refrigerator compartment 2, a temperature sensor 12 for measuring the temperature of the condenser 8, and a cooling fan 13 for the condenser 8. A heat pump system including a control unit 14 that controls the power supplied to the motor 6 and the cooling fan 13 and performs the opening and closing operation of the pressure reducing valve 10 by using the measured values of the internal temperature sensor 11 and the condensation temperature sensor 12. With a Temu 15.

  Further, the vaporizer 9 is disposed at a position thermally coupled to the refrigeration storage chamber 2, and weighs the members 5 to 7, 8, 10 to 14 of the heavy heat pump system 15 other than the vaporizer 9. The ventilation holes 13 and 14 are provided in the exterior 4 below the room 2 in the exterior F and the rear R in the traveling direction of the vehicle, and are formed between the ventilation holes 13 and 14. The condenser 9 and the cooling fan 13 are arranged in the outside air passage 16.

  The exterior 4 protrudes downward so as to straddle a motorcycle or bicycle carrier on the left and right sides, thereby forming left and right legs 4A and 4B defining a recess therebetween, and a main body provided above the legs 4A and 4B. The heat pump system 15 is inserted into the left and right legs while being distributed so as to maintain a weight balance. Reference numeral 17 denotes an auxiliary secondary battery mounted on the vehicle and provided separately from a secondary battery for an electric system of the vehicle so as to supply DC power to the portable refrigerator 1.

  The refrigerating storage chamber 2 constitutes a main body of the refrigerator having an opening 2A opened at an upper part, and is bent in a spiral shape or a substantially U-shape on an outer wall surface of an inner wall 2B made of aluminum constituting the refrigerator. The carburetor 9 composed of a thermally conductive tube attached so as to be thermally coupled is disposed along the state, and the outside is covered with a heat insulating material 2C, and further, an air layer 2D is formed outside the carburetor 9. The outer cover 2E is thermally isolated from the outside of the outer cover 2E by being fixed inside the outer cover 2E so as to be connected to the carburetor 9. .

  The lid 3 includes a pair of hinges 3A provided on one side and a side facing the side provided with the hinge 3A so that the opening 2A formed in the upper part of the cooling chamber 2 can be opened and closed. A lid stopper hook 3B provided at the center of the box, and a lid stopper fastener 3C attached to the exterior 4 corresponding to the lid stopper hook 3B and engaging the lid stopper hook 3B to close the opening 2A. Although the description is omitted, the lid 3 is used to thermally shield the inside of the refrigeration compartment 2 from the outside by a heat insulating structure.

  The exterior 4 is made of a metal having sufficient rigidity, such as stainless steel, and has a strength enough to protect the heat pump system 15 from an external impact that may sufficiently occur with the running of the vehicle. In addition, the exterior 4 forms ventilation holes 20 to 25 at least in the front F and the rear R in the traveling direction of the vehicle, and uses the airflow generated along with the traveling of the vehicle through the ventilation holes 20, 21, and 24. It is configured such that air can be taken in from the outside, and these can be made to function as intake ports 20, 21, and 24. Similarly, it is configured such that air can be exhausted through the vents 23 and 25, and these can function as the exhaust ports 23 and 25.

  In other words, the space between the intake ports 20 and 21 and the exhaust port 23 becomes the outside air passage 16 in which air flows utilizing the airflow generated as the vehicle travels. The condenser 8 disposed therein can be sufficiently cooled by the outside air. In addition, since the condenser 8 is basically arranged inside the outer casing 4 and inside the lower leg portion 4B which is relatively hard to receive sunlight, it avoids a rise in temperature due to direct sunlight, thereby reducing the cooling efficiency. It is configured so that it can be raised.

  The power supply device 5 receives the DC power supplied from the auxiliary secondary battery 17 accommodated in the helmet accommodating portion of the motorcycle and supplies appropriate electric power to the control portion 14 and the motor 6 and the like. Although the DC power supply may be a secondary battery such as an existing battery mounted on the vehicle, the present embodiment shows an example in which another auxiliary secondary battery 17 not involved in running of the vehicle is used as the DC power supply. . Alternatively, a DC power supply such as a solar battery or a primary battery may be used.

  In particular, as shown in FIG. 5, the power supply device 5 of the present embodiment is an AC / DC converter that can supply power from an AC power supply such as a commercial power supply 18 depending on a place where the portable refrigerator 1 is installed, in addition to a DC power supply. 5A. Further, an inverter 5B for generating a three-phase AC from a DC power supply is provided. That is, it is possible to keep the cold storage in the refrigeration compartment 2 only by the power supply from the auxiliary secondary battery 17, and in an environment connectable to the commercial power supply 18, the electric power DC-converted by the AC / DC converter 5 </ b> A is used as the auxiliary secondary battery. It is preferable that the auxiliary secondary battery 17 can be charged by turning it to the secondary battery 17.

  The motor 6 is rotated in a predetermined direction by a three-phase AC power supply, and the rotational force obtained by the motor 6 is supplied to the compression pump 7 to send the refrigerant to the condenser 8 in a compressed state. It is configured to be able to. Since the inverter 5B can rotate the motor 6 at an arbitrary rotation speed and an arbitrary rotation torque, it is possible to efficiently cool the object to be cooled while minimizing energy consumption.

  The compression pump 7, the condenser 8, the vaporizer 9 and the pressure reducing valve 10 each form a closed pipe that allows the refrigerant to flow without leaking, and the condenser 8 is a refrigerant compressed to a high pressure. (See FIG. 4) and a high-pressure pipe which is thermally connected to the high-pressure pipe 8A and is formed in a flat horizontal plane so as not to obstruct the flow of air in the outside air passage 16. Radiation fins (for example, aluminum fins) 8B made of a large number of metal plates. That is, the temperature is increased by being compressed to a high pressure, and the vaporized refrigerant is condensed and liquefied in the condenser 8. The temperature sensor 12 detects the temperature of the condenser 8.

  The pressure reducing valve 10 arbitrarily reduces the pressure of the refrigerant sent from the condenser 8 according to a signal from the control unit 14 and sends it to the low-pressure pipe, so that vaporization accompanying the decompression of the refrigerant starts in the vaporizer 9 and vaporizes from the surroundings. By absorbing the heat, the temperature in the refrigerated storage chamber 2 can be reduced. The temperature sensor 11 detects the temperature inside the refrigerated storage chamber 2.

  The controller 14 measures the temperature in the refrigerated storage room 2 using the temperature sensor 11 and adjusts the operation rate of the motor 6 so that the temperature in the refrigerated storage room 2 is adjusted to the temperature of the contents in the refrigerated storage room 2. At the same time, the pressure reduction rate by the pressure reduction valve 10 is adjusted. On the other hand, by measuring the temperature of the condenser 8 by using the temperature sensor 12, the cooling fan 13 is used, if necessary, so that the refrigerant is sufficiently condensed in the condenser 8. The air flow is forcibly created.

  The heat pump system 15 according to the present embodiment improves the left-right balance while keeping the center of gravity of the portable refrigerator 1 low by arranging the heavy objects in the left and right legs 4A and 4B in consideration of the weight balance. This makes it easier to balance the traveling of the vehicle equipped with the portable refrigerator 1 and also prevents the portable refrigerator 1 from dropping from the carrier of a motorcycle or bicycle.

  FIG. 6 is a view showing a state where the portable refrigerator 1 is mounted on a motorcycle 30 as an example of a vehicle. As shown in FIG. 6, the motorcycle 30 includes a secondary battery 31 for starting its engine and supplying power to a running electric system. By mounting the auxiliary secondary battery 17 described above, the temperature of the object to be kept cold in the portable refrigerator 1 can be kept at a low temperature without adversely affecting the secondary battery 31 required for the motorcycle 30 to travel.

  The portable refrigerator 1 mounted on the bed of the motorcycle 30 has its legs 4A, 4B arranged so as to straddle the bed, and the heavier heat pump system 15 is provided in the legs 4A, 4B. Most of the motorcycle is housed in a well-balanced left and right position, so that it sits well on the loading platform and does not easily fall down, but also has a low center of gravity, which adversely affects the overall balance of the motorcycle 30. Instead, a large-capacity portable refrigerator 1 can be mounted.

  Further, the wind generated from the front direction F to the rear direction R in the traveling direction as the motorcycle 30 travels passes through the ventilation holes 20 to 22 formed in the exterior 4 of the portable refrigerator 1 as shown by arrows 32 and 33. It is configured to flow in the outside air passage 16 formed in the leg 4A through the air passage, and the condenser 8 arranged in the outside air passage 16 can be cooled strongly. Cooling efficiency is improved.

  The portable refrigerator 1 of the present invention may be mounted not only on the motorcycle 30 as a vehicle but also on a vehicle such as a bicycle or a rear car. In this case, although not shown, the auxiliary secondary battery 17 may be divided into one or both of the legs 4A and 4B and inserted to maintain the weight balance.

  FIG. 7 is a view showing a modification of the portable refrigerator 1 of the present invention. That is, the portable refrigerator 1 of the present invention may be configured such that the auxiliary secondary battery 41 that fits into the concave portion 40 formed between the legs 4A and 4B can be detachably attached. That is, a pair of ribs 42A and 42B are formed at the lower end of the recess 40, and cutouts 43A and 43B that fit into the ribs 42A and 42B are formed at the auxiliary secondary battery 41 side. It is possible to prevent the secondary battery 41 from falling off in a fitted state.

  Further, connector portions 44 and 45 for electrically connecting the auxiliary secondary battery 41 to the power supply device 5 may be formed at positions corresponding to the concave portions 40 and the auxiliary secondary battery 41.

  With such a configuration, when mounted on a vehicle having a flat surface such as a rear car, the bottom area can be increased, and a heavy object such as an auxiliary secondary battery is arranged at the lowermost portion, so that more stable operation can be achieved. There is also the advantage that the arrangement is possible. Further, there is an advantage that a space for mounting only the auxiliary secondary battery 41 separately from the portable refrigerator 1 is not required.

  In the description of the above-described embodiment, a secondary battery (battery) is illustrated as an example of the DC power supply as a practical configuration, but it is needless to say that the DC power supply may be a primary battery. .

DESCRIPTION OF SYMBOLS 1 Portable refrigerator 2 Refrigeration storage room 3 Cover 4 Exterior 4A, 4B Leg 5 Power supply device 6 Motor 7 Compression pump 8 Condenser 9 Vaporizer 10 Pressure reducing valve 15 Heat pump system 16 External air passage 17 Auxiliary secondary battery 20-25 ventilation Mouth 30 Vehicle 40 Concave part 41 Secondary battery

Claims (5)

A portable refrigerator that can be mounted on a vehicle, including a refrigerated storage room having an insulated structure capable of storing an object to be kept cool, a door having an insulated structure capable of opening and closing the refrigerated storage room, and an exterior capable of withstanding an external impact. And
A power supply device operable by at least power supply from a DC power supply;
A motor driven to rotate by power supply from the power supply device;
A compression pump for compressing the refrigerant by the rotational force of the motor;
A condenser for cooling the compressed refrigerant,
Having a heat pump system comprising a vaporizer that absorbs heat by the expanded refrigerant,
The vaporizer is disposed at a position thermally coupled to the refrigerator compartment,
A heavy heat pump system member other than the vaporizer is arranged in the outer casing below the refrigeration compartment,
Ventilation holes are opened in the front and rear exterior of the vehicle in the direction of travel,
A portable refrigerator, wherein the condenser is arranged in an outside air passage formed between both vents.   The exterior is provided with left and right legs forming a recess therebetween by protruding downward so as to straddle a motorcycle or bicycle carrier on the left and right, so that each member constituting the heat pump system maintains a weight balance. 2. The portable refrigerator according to claim 1, wherein the portable refrigerator is inserted into the left and right legs in a distributed state.   3. The portable refrigerator according to claim 1, further comprising an auxiliary secondary battery that can be inserted into the outer casing or can be engaged with the outer casing and that can supply power to the power supply device. 4.   3. The portable refrigerator according to claim 2, further comprising an auxiliary secondary battery that can be fitted into a recess between the legs and that can supply power to the power supply device. 4.   5. The portable refrigerator according to claim 3, wherein the power supply device is operable by power supply from a commercial power supply, and is capable of charging the auxiliary secondary battery in a power supply state from a commercial power supply. 6.