JPH06207771A - Cold and hot storage chamber - Google Patents

Abstract

PURPOSE:To carry out control of a power consumption or an input current while contriving the prevention of remarkable deterioration in performance by switching the semiconductor thermoelectric elements of two circuits manually between series conduction and parallel conduction. CONSTITUTION:The title chamber is provided with a series/parallel changeover switch 10a, switching semiconductor thermoelectric elements 5c, 5d of tow circuits manually between series conduction and parallel conduction, to permit the control of cold and hot storage capacity into strong and/or weak.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile (connected to a battery plug) capable of reducing the load of a power supply by controlling the capacity during refrigeration and heating by switching the energization to a semiconductor thermoelectric element circuit. It is used for cold storage.

[0002]

2. Description of the Related Art A conventional cold storage cabinet will be described with reference to FIGS. FIG. 8: is a figure which shows the schematic cross section of the conventional cold storage. In addition, FIG. 9 is a diagram showing an electric circuit of a conventional cold storage.

A conventional well-known cold storage cabinet has a heat insulating box 1 having a main body 2 having an open top surface and a lid 3 for closing the opening of the main body 2 as shown in FIGS. 8 and 9. It is formed. In general, the heat-insulating box 1 has a form in which an object to be cooled (heated) is accommodated in the space inside the container to be cooled (heated), and the tank wall 4 corresponding to the inner wall of the main body 2 is It is formed of a good heat conductive plate having a plate thickness of about 1 to 2 mm such as an aluminum plate, and this tank wall 4 is also used as a cooling (heating) plate.

On the other hand, a semiconductor thermoelectric element 5 is provided to cool (heat) the tank wall 4 and the space inside the chamber surrounded by the tank wall 4 to a low temperature (high temperature).
Is made of metal with the inside heat collecting plate 5a attached to the side surface of the tank wall 4,
For example, the heat transfer block 6 made of aluminum and the heat collecting plate 5b on the outer side of the refrigerator are in close contact with the heat sink 7 for heat radiation, and are sandwiched between these two parts.

Heat conduction is formed between the inside heat collecting plate 5a of the semiconductor thermoelectric element 5 and the tank wall 4 and between the outside heat collecting plate 5b and the heat sink 7 through the heat transfer block 6. It is what is done. Normally, the heat transfer block 6
Tighten the heat sink 7 and the heat sink 7 with screws, etc.
While sandwiching the semiconductor thermoelectric element 5 of the circuit,
The heat transfer block 6 is also fastened to the tank wall 4 with screws or the like so as to be integrally fixed.

Further, this heat sink 7 is provided with a fan 8
It is configured to be forced to blow. A packing 9 is mounted between the back surface of the heat sink 7 and the main body 2 so as to surround the heat transfer block 6, and the performance is deteriorated due to dew condensation on the heat transfer block 6 and the semiconductor thermoelectric element 5 during cooling, and the semiconductor thermoelectric element. The insulation property of 5 is secured.

The fan 8 is controlled to switch between a strong wind and a weak wind by changing the supply voltage using a dropping resistance 11 with a strength change switch 10. The cold / hot storage switch 13 connected to the battery 12 has two circuits in three positions: an OFF position, a cold storage position (COOL), and a hot storage position (HOT). The diode 14 holds the rotation direction of the fan 8 constant regardless of the polarity change of the power supply line due to the switching of the cold / hot storage switch 13.

Next, the operation will be described. When the switch 13 of the cold / hot storage is operated to the cold storage position (COOL), the heat pump action of the semiconductor thermoelectric element 5 cools the inside heat collecting plate 5a → the heat transfer block 6 → the tank wall 4 in this order to lower the inside temperature. . At the same time, the heat pump 7 is heated by the heat collection plate 5b on the outer side of the chamber by the amount of heat transferred from the inner side of the chamber and the amount of heat generated by the semiconductor thermoelectric element 5 (joule heat amount).

This amount of heat is radiated to the outside of the cabinet by strong air blowing by the fan 8 that is being driven at the same time, and the specified temperature difference (usually 20 to 25 de) which is the capacity setting value of the semiconductor thermoelectric element 5 is radiated.
g. Up to), the internal temperature is lower than the external temperature, and the refrigerated state is maintained. At this time, by changing the strength switch 10 to weak, the amount of air blown by the fan 8 is reduced, and the amount of heat radiation to the outside of the refrigerator is reduced. For this reason, the temperature of the heat sink rises in a weak operation as compared with that in a strong operation, and the capacity of the semiconductor thermoelectric element 5 is substantially constant. Similarly, in strong operation, the cold storage temperature is kept lower than in weak operation.

On the other hand, when the cold / hot box switch 13 is operated to the hot position (HOT), an electric current flows in the opposite direction to the above, and the inside heat collecting plate 5a radiates heat (heats) to function as a hot box. To work. It should be noted that the temperature inside the refrigerator during heating is maintained at the set temperature by intermittently energizing the semiconductor thermoelectric element 5 with a thermo switch (not shown).・ The temperature in the refrigerator does not change during weak operation.

[0011]

Since the conventional cold storage is constructed as described above, even if the strong / weak changeover switch 10 is weakened during operation, the semiconductor thermoelectric element 5 occupies most of the consumed current. Since the current to the power supply does not change, there is a problem in that when the cooler is used in the summer or when the engine is idle and the power consumption is higher than the amount of power generated by the dynamo, problems such as battery exhaustion occur.

The present invention has been made in order to solve the above-mentioned problems, and the current consumption during operation can be greatly reduced, and at the same time, the cold-keeping / heat-retaining performance as a cold storage is remarkable. The purpose is to obtain a cold storage with a function that does not deteriorate.

[0013]

A refrigerating cabinet according to claim 1 of the present invention comprises the following means. [1] A power supply switching circuit that switches the polarity of the battery depending on whether it is refrigerated or hot. [2] A plurality of semiconductor thermoelectric element circuits for cooling or heating the inside of the refrigerator based on the voltage applied from the battery. [3] A series-parallel switching circuit that switches the plurality of semiconductor thermoelectric element circuits to series or parallel energization when the cold storage capacity is changed.

The cold-storage cabinet according to claim 2 of the present invention comprises the following means. [1] A power supply switching circuit that switches the polarity of the battery depending on whether it is refrigerated or hot. [2] A plurality of semiconductor thermoelectric element circuits for cooling or heating the inside of the refrigerator based on the voltage applied from the battery. [3] A serial / parallel switching circuit that switches the plurality of semiconductor thermoelectric element circuits to serial or parallel energization according to the engine speed to change the cold / heat storage capacity.

The cold-storage cabinet according to claim 3 of the present invention comprises the following means. [1] A power supply switching circuit that switches the polarity of the battery depending on whether it is refrigerated or hot. [2] A plurality of semiconductor thermoelectric element circuits for cooling or heating the inside of the refrigerator based on the voltage applied from the battery. [3] A serial / parallel switching circuit that switches the plurality of semiconductor thermoelectric element circuits to serial or parallel energization according to the magnitude of the applied voltage to change the cold / hot storage capacity.

[0016]

In the refrigerating cabinet according to claim 1 of the present invention, when the serial / parallel changeover switch is moved from the strong position to the weak position during the refrigerating operation, the semiconductor thermoelectric elements of the n (n ≧ 2) circuits are energized in parallel. Since it is energized in series, the current consumption is reduced to approximately 1 / n ² and a large reduction in power consumption can be achieved with a relatively small reduction in refrigeration / heating performance. Can be restored to storage capacity.

Further, in the cold / hot storage according to claim 2 of the present invention, the engine speed, which is one of the indicators of the usage state of the automobile during the cold / hot storage operation, is detected and compared with the target value.
When the engine speed becomes lower than the target value, the n-circuit semiconductor thermoelectric elements are automatically switched from parallel energization to series energization, so the current consumption is reduced to approximately 1 / n ² A large reduction in power consumption can be achieved with a relatively small decrease in storage performance, and the original cold storage capacity is immediately restored automatically as the engine speed increases. Further, when the engine output is required at a high rotation speed by the program, it is possible to automatically reduce the power consumption which becomes a dynamo load, and automatically switch from the cold storage to the cold / warm state in which the power supply is stopped when the engine is stopped.

Further, in the cold / hot refrigerator according to claim 3 of the present invention, the voltage applied to the refrigerator is constantly detected during the cold / hot storage operation and compared with the target value, and the battery voltage becomes lower than the target value. In this case, since the semiconductor thermoelectric elements of the n circuits are automatically switched from parallel energization to series energization, the current consumption is reduced to approximately 1 / n ² and the deterioration of the refrigeration / heating performance is relatively small, which is significant. Power saving can be achieved, and as the battery voltage, which is the voltage applied to the refrigerator, rises, it immediately and automatically returns to the original cold storage capacity. Further, by setting a target value lower than the above-mentioned target value, it is possible to automatically switch between the energized state and the cold / heat-retained state by de-energizing.

[0019]

【Example】

Example 1. Hereinafter, the configuration of the first embodiment of the present invention will be described with reference to FIG. Since the basic configuration other than the wiring diagram is the same as that of the conventional example described above, it is omitted, and only the electrical wiring diagram will be described.

In FIG. 1, the cold / hot storage according to the first embodiment includes a two-circuit semiconductor thermoelectric element 5, a heat sink cooling axial fan 8, an OFF position, and a cold storage position (COO).
L) and a cold / hot storage switch 13 having two circuits at three positions of the hot storage position (HOT). Further, it is provided with a diode 14, a battery 12, and a series / parallel (weak / strong) switch 10a having two circuits for switching the two semiconductor thermoelectric elements 5 in series / parallel.

By the way, the power supply switching circuit according to claim 1 of the present invention corresponds to the cold / hot storage switch 13 in the first embodiment, and the plurality of semiconductor thermoelectric element circuits according to the first embodiment is the semiconductor thermoelectric device in the first embodiment. Corresponding to the elements 5c and 5d,
The serial-parallel switching circuit according to Example 1 corresponds to the serial-parallel switching switch 10a in the first embodiment.

Next, the operation of the first embodiment will be described, but since the basic operation is the same, the description thereof will be omitted, and only the operation of the electrical-related portion will be described based on the electrical component configuration diagram of FIG.

The cold / hot storage switch 13 is set to the cold storage position (COO
L) to set the serial / parallel switch 10a to the parallel side (strong side) as shown in the figure, the current from the battery 12 passes through the cold / hot storage switch 13 and one system includes two circuits of the semiconductor thermoelectric elements 5. 5c side → serial / parallel switch 10
The flow is as follows: a → cooling / refrigerating switch 13 → battery 12, and the other is serial / parallel changeover switch 10a → 5d side of the semiconductor thermoelectric element 5 → cooling / refrigerating switch 13 → battery 12.

At this time, the axial flow fan 8 is applied with the voltage of the battery 12 at substantially the same voltage through one of the diodes 14, and the strong operation is performed to cool the heat sink.

When the serial / parallel change-over switch 10a is set in the direction opposite to that shown in the drawing, that is, in the series side (weak side), the battery 1
The current from 2 is the cold / hot storage switch 13 → 5c side of the two-circuit semiconductor thermoelectric element 5 → serial / parallel switch 10a →
The flow proceeds from the 5d side to the cold / hot storage switch 13 to the battery 12.

At this time, the voltage of the battery 12 is applied to the axial fan 8 via the cold / hot storage switch 13 → 5c side of the semiconductor thermoelectric element 5 of the two circuits → one of the diodes 14, and the voltage drop during this period weakens the voltage. The operation started and the heat sink was cooled, and at the same time the fan noise was reduced.

The case where the cold / hot storage switch 13 is set to the cold storage position (COOL) has been described above. When the cold / hot storage switch 13 is set to the hot storage position (HOT), the direction of the current flowing through the semiconductor thermoelectric element 5 is described. Becomes the opposite, and acts as a refrigerator. In addition, the temperature inside the refrigerator during warming is the same as in the conventional case.
It is designed to be maintained at the set temperature by turning on and off the power to.

Here, the characteristics of the semiconductor thermoelectric element will be described. The heat absorption amount Qab is expressed by the following equation.

[0029] _{Qab = n · s · T C} · i ( Peruchu effect) -1/2 · ⁱ 2 · R (Joule loss) -K _{(T H} -
T _C) (thermal conduction losses) (W) n: a semiconductor thermoelectric element number, s: average Seebeck coefficient of the semiconductor thermoelectric elements (v / °
k), _{T C:} cold side temperature of the semiconductor thermoelectric element itself (° k), _{T H:} upper temperature of the semiconductor thermoelectric element itself (° k), i: current flowing through the semiconductor thermoelectric elements (A), R: Resistance (Ω) of semiconductor thermoelectric element, K: Thermal transmittance (w / ° k) of semiconductor thermoelectric element.

From this equation, when cooling is taken as an example, the cooling capacity is the average Seebeck coefficient s and the number of elements n of the semiconductor thermoelectric element.
If the values are the same, the stronger the current value, the stronger the strength. Therefore, by dividing the conventional semiconductor thermoelectric element into two circuits to form a two-circuit configuration, when these circuits are connected in series, the resistance is 1 / {(1/2). R} +1 / {(1/2) · R} = 1
Therefore, Rx = (1/4) .multidot.R, which is 1/4 of that in series, and the current value under the same voltage is 4 times.

Therefore, when the two semiconductor thermoelectric elements 5 are energized in parallel, the same semiconductor thermoelectric element level (number of elements
It is possible to improve the performance by several steps than the conventional one by the resistance value in series), but at the same time, the current consumption also increases. Therefore, in order to reduce the battery load of the automobile in the first embodiment,
Although the series operation and the current consumption will be the same as the conventional one, the current consumption will increase, but it is designed to switch to the parallel operation, which has a better cooling and cooling capacity, and the user can manually switch depending on the situation. It was possible. In the above description, the two-circuit semiconductor thermoelectric element 5 is shown as one element, but the same effect can be obtained by mounting two identical elements in the same manner and forming a two-circuit configuration.

The first embodiment of the present invention, as described above,
In a refrigerating storage cabinet capable of controlling the refrigerating and refrigerating capacity by the semiconductor thermoelectric element 5, two or more circuits of semiconductor thermoelectric elements 5 and a series / parallel switch 10a for switching the semiconductor thermoelectric elements of these circuits to direct / parallel energization are provided. It is characterized by that. That is, in the cold / hot storage where the cold / hot storage capacity can be controlled weakly by the semiconductor thermoelectric element 5, the semiconductor thermoelectric elements 5c and 5d of the two circuits and the series / parallel connection for switching the semiconductor thermoelectric elements 5 of these circuits to serial / parallel energization. By providing the change-over switch 10a, it is possible to reduce power consumption while preventing a large decrease in the performance of the cold storage by a user's operation, and it is possible to prevent a malfunction such as a battery exhaustion of the automobile. Play.

Example 2. In the first embodiment described above, the serial / parallel switching of the two semiconductor thermoelectric elements 5 is manually performed. However, in the second embodiment, the engine speed of the automobile is detected as shown in FIG. The semiconductor thermoelectric element 5 of two circuits is automatically controlled by an automatic controller 30 which is switched by using a series-parallel switching relay 30b in comparison with a target value.

Also, the second embodiment has the same basic structure as the conventional one, and therefore the description thereof will be omitted, and only the structure of electric parts will be described.

In FIG. 2, the cold / hot refrigerator according to the second embodiment has a two-circuit semiconductor thermoelectric element 5, a heat sink cooling axial fan 8, a strength change switch 10, a battery 12, an OFF position, and a cold storage position ( COOL) and a cold / hot storage switch 13 having two circuits at three positions (HOT).

Further, the cold storage according to the second embodiment detects the engine speed and compares it with the target value, and actuates the serial / parallel switching relay 30b and the energization control relay 30c to the semiconductor thermoelectric element 5 according to the result. An automatic controller 30 having a control unit 30a is provided. The engine speed can be detected, for example, by counting the ignition noise coming from the power source (battery 12).

The control unit 30a has an input circuit 31, a memory 32, a CPU 33, and an output circuit 34.
The output circuit 34 is connected to the cooling fan 8, the serial / parallel switching relay 30b, and the energization control relay 30c.

By the way, the power supply switching circuit according to claim 2 of the present invention corresponds to the cold / hot storage switch 13 in the second embodiment, and the plurality of semiconductor thermoelectric element circuits according to the second embodiment are the semiconductor thermoelectric elements in the second embodiment. It corresponds to the elements 5c and 5d, and
In the second embodiment, the serial / parallel switching circuit according to the second embodiment includes a strength / weakness changeover switch 10, a control unit 30a, a serial / parallel switching relay 30b, and an energization control relay 30c.

Next, the operation of the second embodiment will be described, but the basic operation is the same and therefore omitted, and only the operation of the electrical-related parts is shown in FIG. 2 showing the electrical part configuration, FIG. 3 showing a time chart, and a flow chart. Will be described with reference to FIG.

Set the cold / hot storage switch 13 to the cold storage position (COO
L) (step 40) and the strength changeover switch 10 is set to the strong side, which is the opposite of FIG. 2, and when the automatic controller 30 detects that the engine is stopped, the power is turned on. The control relay 30c is turned off to stop the cold storage (steps 45 to 46), and when the engine starts to rotate again, this is detected and the energization control relay 30c is turned on to restart the operation of the cold storage.

Further, when the engine speed is below the target value (1) (YES in step 42) and above the target value (2) (NO in step 41), the serial / parallel switching relay 30b is provided. Is OFF (see FIG. 3 (d)), and the current in the two-circuit semiconductor thermoelectric element 5 is the cold / hot storage switch 13 → semiconductor thermoelectric element 5c side → serial / parallel switching relay 30b → semiconductor thermoelectric element 5d side. -> Energization control relay 30c-> cold / heat storage switch 13-> battery 12
And flows in series.

When the engine speed is between the target values (1) and (2), the serial / parallel switching relay 30b is provided.
Is turned on (steps 43 to 44), and a current flows through the two-circuit semiconductor thermoelectric element 5 to the cold / hot storage switch 13 → 5c side of the semiconductor thermoelectric device → serial / parallel switching relay 30b → cool / hot storage switch 13 → battery 12 , And the cold / hot storage switch 13 → the serial / parallel switching relay 30b → the 5d side of the semiconductor thermoelectric element → the energization control relay 30c → the cold / hot storage switch 13 → the battery 12 flows in parallel.

When the strength / weakness changeover switch 10 is weak, the two circuits of the semiconductor thermoelectric elements 5 are always operated while the engine is rotating, except that the energization control relay 30c is turned off to stop the cold storage when the engine is stopped. Energize in series connection,
The cooling fan 8 is also weakly driven by the automatic controller 30 at a rotation speed with less noise than during strong driving.

Although the case where the switch 13 of the cold / hot storage is set to the cold storage position (COOL) has been described above, when the cold / hot storage switch 13 is set to the hot storage position (HOT), the current flowing through the semiconductor thermoelectric element 5 is The direction is reversed, and it acts as a refrigerator.

As in the conventional case, the temperature inside the refrigerator during heating is maintained at the set temperature by intermittently energizing the semiconductor thermoelectric element 5 with a thermoswitch (not shown). As described above, since the same effect as that of the first embodiment is obtained by the automatic control by utilizing the engine speed of the automobile, it is possible to prevent troubles such as battery exhaustion during driving which is considered to occur due to user's forgetting operation. In addition, it is possible to reduce the load at the time of high engine rotation, which is peculiar to this embodiment, and it is possible to reduce the load at the time of acceleration due to a change in the engine speed by changing the program.

The second embodiment of the present invention, as described above,
Since the control unit 30a that detects the engine speed and compares it with the target value and switches and operates the serial / parallel switching relay 30b based on the result is provided, it is possible to operate the refrigerator / cooler when operating the cold / heat storage, which is thought to occur due to the user forgetting the operation. There are effects such as prevention of troubles such as battery exhaustion, reduction of load during high-speed engine rotation, which is peculiar to the second embodiment, and reduction of load during acceleration due to changes in engine speed.

Example 3. Next, the voltage applied to the cold / hot storage, not the engine speed, is compared with the detection target value, and the semiconductor thermoelectric elements 5 of the two circuits are connected in series / parallel according to the result.
FIG. 5 shows an example of automatic control by the control unit 20a that switches using 0b.

Since the basic structure of the third embodiment is the same as the conventional one, the description thereof will be omitted, and only the structure of electric parts will be described.

In FIG. 5, the refrigerating cabinet according to the third embodiment has a two-circuit semiconductor thermoelectric element 5, a heat sink cooling axial fan 8, a strength change switch 10, a battery 12, an OFF position, and a refrigerating position. (COOL) and a cold / hot storage switch 13 having two circuits at three positions (HOT).

Further, in the cold / hot warehouse according to the third embodiment, the cold / hot warehouse applied voltage which is a voltage close to the battery voltage is detected and compared with the target value, and the serial / parallel switching relay 20b and the semiconductor thermoelectric element are determined according to the result. Energization control relay 20 to 5
It comprises an automatic controller 20 having a control unit 20a for actuating c.

The control unit 20a includes an A / D converter 25 for converting the detected voltage, an input circuit 21, a memory 22 and a C.
It has a PU 23 and an output circuit 24. Output circuit 24
Is connected to the cooling fan 8, the serial / parallel switching relay 20b, and the energization control relay 20c.

By the way, the power supply switching circuit according to claim 3 of the present invention corresponds to the cold / hot storage switch 13 in the third embodiment, and the plurality of semiconductor thermoelectric element circuits according to the third embodiment are the semiconductor thermoelectric devices in the third embodiment. Claims 3c and 5d correspond to the elements 5c and 5d, respectively.
In the third embodiment, the serial / parallel switching circuit according to (3) includes a strength / weakness changeover switch 10, a control unit 20a, a serial / parallel switching relay 20b, and an energization control relay 20c.

Next, the operation of the third embodiment will be described, but the basic operation is the same and therefore omitted, and only the operation of the electrical-related parts is shown in FIG. 5, which shows the configuration of electric parts, FIG. 6 which shows a time chart, and a flow chart. Will be described with reference to FIG.

Set the cold / hot storage switch 13 to the cold storage position (COO
L) (step 50) and the strength changeover switch 10 is set to the strong side as opposed to FIG. 5, as shown in the flowchart of FIG. 7, the automatic unit 20a causes the applied voltage of the cold storage to reach the target value (1). ) When the following is detected, the energization control relay 20c is turned off and the cold storage is stopped (steps 54 to 55).

When the applied voltage returns to the target value (1) or more, this is detected and the energization control relay 20c is turned on to restart the operation of the cold storage.

Further, the applied voltage increases and the target value (1)
When the value exceeds the target value (2), the series-parallel switching relay 20b is turned off, and the semiconductor thermoelectric element 5 of the two circuits has a current of the cold / heat storage switch 13 → 5c of the semiconductor thermoelectric element.
Side → series / parallel switching relay 20b → semiconductor thermoelectric element 5d side → energization control relay 20c → cold storage switch 13
→ It flows in series with the battery 12.

When the applied voltage exceeds the target value (2), the serial / parallel switching relay 20b is turned on, and the current is supplied to the semiconductor thermoelectric element 5 of the two circuits, and the cold / hot storage switch 13 →
5c side of semiconductor thermoelectric element → serial / parallel switching relay 20
b → cooling / refrigerating cabinet switch 13 → battery 12 and cold / refrigerating cabinet switch 13 → serial / parallel switching relay 20b → 5d side of the semiconductor thermoelectric element → energization control relay 20c → cooling / refrigerating cabinet switch 13 → battery 12 in parallel.

When the strength / weakness changeover switch 10 is weak, when the applied voltage is less than the target value (1), the energization control relay 20c is turned off and the cold storage is stopped at all times.
The semiconductor thermoelectric elements 5 of two circuits are energized in series connection, and the cooling fan 8 is also weakly operated by the automatic controller 20 at a rotation speed with less noise than during strong operation.

The case where the cold / hot box switch 13 is set to the cold position (COOL) has been described above. When the cold / hot box switch 13 is set to the hot position (HOT), the direction of the current flowing through the semiconductor thermoelectric element 5 is described. Becomes the opposite, and acts as a refrigerator.

As in the conventional case, the temperature inside the refrigerator during heating is maintained at the set temperature by intermittently energizing the semiconductor thermoelectric element 5 with a thermoswitch (not shown).

As described above, according to the third embodiment, since the strong / weak operation is automatically controlled by using the voltage applied to the cold / hot storage, the battery exhaustion at the time of operation, which is considered to occur due to the user forgetting the operation, etc. It is possible to prevent troubles such as the above, and to prevent damage to the DC power supply due to excessive load during strong operation of the cold storage, which is considered to occur when a DC power supply other than the automobile unique to the third embodiment is used.

The third embodiment of the present invention, as described above,
Since the control unit 20a which detects the voltage applied to the semiconductor thermoelectric element 5 and compares it with the target value and switches and operates the serial / parallel switching relay 20b based on the result, the cooling temperature which is considered to occur due to the user forgetting to operate etc. Effects such as prevention of troubles such as battery exhaustion during storage operation, and prevention of damage to this DC power supply due to excessive load during cold / hot storage operation, which is considered to occur when using a DC power supply other than the automobile unique to the third embodiment. Have.

[0063]

As described above, the refrigerating cabinet according to claim 1 of the present invention is a refrigerator based on the voltage applied from the battery and the power source switching circuit for switching the polarity of the battery according to refrigeration or heating. Equipped with a plurality of semiconductor thermoelectric element circuits for cooling or heating the inside, and a series-parallel switching circuit for switching the plurality of semiconductor thermoelectric element circuits to series or parallel energization when changing the cold storage capacity, so that the user can operate the cooling temperature It is possible to reduce power consumption while preventing a large decrease in the performance of the warehouse, and it is possible to prevent problems such as a battery exhaustion of an automobile.

Further, according to a second aspect of the present invention, there is provided a refrigerating / cooling cabinet in which a power source switching circuit for switching the polarity of the battery in accordance with refrigeration or warming and cooling or heating of the cabinet based on the voltage applied from the battery. Since a plurality of semiconductor thermoelectric element circuits for heating and a series-parallel switching circuit for switching the plurality of semiconductor thermoelectric element circuits to series or parallel energization according to the engine speed to change the cold / hot storage capacity are operated by the user. It is possible to prevent troubles such as battery exhaustion during cold / warm storage operation that is likely to occur due to forgetting, reduce the load when the engine is running at high speed, and reduce the load when accelerating due to changes in engine speed. Produce the effect of.

Further, according to a third aspect of the present invention, there is provided a power source switching circuit for switching the polarity of the battery in accordance with refrigeration or heating, and cooling or heating of the interior of the refrigerator based on the voltage applied from the battery. Since a plurality of semiconductor thermoelectric element circuits for heating and a series-parallel switching circuit for changing the cold / hot storage capacity by switching the plurality of semiconductor thermoelectric element circuits to series or parallel energization according to the magnitude of the applied voltage, This is due to the prevention of troubles such as battery exhaustion during cold / warm storage operation that is likely to occur due to the user's forgetting operation, and the excessive load during heavy-duty cold / storage storage operation that is likely to occur when using a DC power source other than the automobile unique to the present invention. This has the effect of preventing damage to the DC power supply.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of electric components according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of electric components according to a second embodiment of the present invention.

FIG. 3 is a timing chart showing the operation of the second embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the second embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of electric components according to a third embodiment of the present invention.

FIG. 6 is a timing chart showing the operation of the third embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of the third embodiment of the present invention.

FIG. 8 is a diagram showing a general structure of a conventional cold storage cabinet.

FIG. 9 is a view showing a structure of an electric component of a conventional cold storage cabinet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation box body 2 Main body 3 Lid 4 Tank wall 5 Semiconductor thermoelectric element 5a Inside heat collecting plate 5b Outside heat collecting plate 5c, 5d Each circuit constituting the semiconductor thermoelectric element 6 Heat transfer block 7 Heat sink 8 Fan 9 Packing 10 Strength switching switch 10a Series / parallel switching switch 12 Battery 13 Cold / heat storage switch 14 Diode 20, 30 Automatic controller 20a, 30a Control unit 20b, 30b Series / parallel switching relay 20c, 20c Energization control relay

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[Procedure amendment]

[Submission date] November 22, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

Next, the operation will be described. When the switch 13 of the cold / hot storage is operated to the cold storage position (COOL), the heat pump action of the semiconductor thermoelectric element 5 cools the inside heat collecting plate 5a → the heat transfer block 6 → the tank wall 4 in this order to lower the inside temperature. . At the same time, the heat sink 7 is heated by the heat collection plate 5b on the outer side of the chamber by the amount of heat transferred from the inner side of the chamber and the amount of heat generated by the semiconductor thermoelectric element 5 (joule heat amount).

Claims (3)

[Claims] 1. A power source switching circuit for switching the polarity of a battery according to refrigeration or heating, a plurality of semiconductor thermoelectric element circuits for cooling or heating the inside of the refrigerator based on an applied voltage from the battery, and a cooling / heating capability. A refrigerating cabinet, comprising a series-parallel switching circuit for switching the plurality of semiconductor thermoelectric element circuits to series or parallel energization when changing. 2. A power source switching circuit for switching the polarity of the battery according to refrigeration or heating, a plurality of semiconductor thermoelectric element circuits for cooling or heating the inside of the refrigerator based on an applied voltage from the battery, and an engine speed. A refrigerating cabinet comprising a series-parallel switching circuit for changing the refrigerating cabinet capacity by switching the plurality of semiconductor thermoelectric element circuits to series or parallel energization in accordance therewith. 3. A power source switching circuit for switching the polarity of a battery according to refrigeration or heating, a plurality of semiconductor thermoelectric element circuits for cooling or warming the inside of the refrigerator based on an applied voltage from the battery, and the applied voltage. A refrigerating cabinet, comprising a series-parallel switching circuit for switching the plurality of semiconductor thermoelectric element circuits to series or parallel energization to change the refrigerating cabinet capacity depending on the size.