JPH085221A - Electronic cooling type refrigerator-heater - Google Patents

Abstract

PURPOSE:To prevent backflow of heat from radiator fins toward a metal electrode inside a refrigerator-heater by controlling the number of revolutions of a fan so that a temperature inside the refrigerator-heater be a set temperature, in the electronic cooling type refrigerator-heater equipped with a Peltier element and the fan sending air forcibly to the radiator fins of the element exposed outside the refrigerator-heater. CONSTITUTION:A Peltier element 11 is composed of a P-type element and an N-type element and heat is absorbed from a metal electrode and radiated from radiator fins when a current is made to flow from the N-type element to the P-type element, while the heat is absorbed from the radiator fins and radiated from the metal electrode when the current is made to flow in the reverse direction. In an electronic cooling type refrigerator-heater using this Peltier element, a voltage supplied to a fan motor 14 is adjusted by a controller 18 in accordance with a difference between a temperature inside the refrigerator-heater detected by a sensor 21 of the temperature inside the refrigerator-heater and a set temperature, on the occasion when an operating switch 17 is made. According to this constitution, a fan is operated constantly without being stopped and thereby the heat is prevented from flowing back from the radiator fins toward the electrode inside the refrigerator-heater and warming the inside of the refrigerator-heater.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic cooling type cold storage cabinet using a Peltier device.

[0002]

2. Description of the Related Art FIG. 2 shows an example of this type of conventional cold storage. The upper opening of the main body 1 of the cold storage 100 is opened and closed by a lid 3 pivotally supported by a hinge 2 on the main body 1.

The main body 1 comprises an inner surface plate 4 made of a material having a high thermal conductivity such as aluminum, and a heat insulating material 5 attached to the outer surface thereof.
And an outer surface plate 6 that covers this. The lid 3 is formed by laminating an inner surface plate 7, a heat insulating material 8 and an outer surface plate 9 in this order.

A metal electrode of the Peltier element 11 is brought into close contact with the inner surface plate 4, and its heat radiation fin 12 is exposed outside the refrigerator. The fan 13 is forcibly blown to the heat radiation fin 12. In addition, 14 is a fan motor for driving the fan 13, and 15 is a to-be-cooled object to be cooled such as canned juice stored in the inside 16.

The Peltier element 11 is formed by joining two types of thermoelectric semiconductors, which are a P-type element and an N-type element, in a π-type with a metal electrode. When a current is passed from the N-type element to the P-type element, the Peltier effect is obtained. Thus, the heat is absorbed from the metal electrode and radiated from the radiation fin 12.

When an electric current is applied in the opposite direction to the above, the radiation fin
Heat is absorbed from 12 and radiates from the metal electrode. In addition, when either the metal electrode or the radiation fin is cooled or heated to generate a temperature difference between them, an electric current is generated.

[0007]

[Problems to be Solved by the Invention] The above conventional cold storage 10
In 0, since the Peltier element 11 and the fan motor 14 were de-energized when the temperature inside the refrigerator decreased to the set temperature, the heat radiation fins 12 exposed outside the room immediately became room temperature and A temperature difference occurs between the metal electrode and the metal electrode. Then, the heat flows back from the radiation fins 12 toward the metal electrode to heat the interior 16 so that the interior 16 returns to room temperature in a short time.

[0008]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems, and its gist is to provide a fan for forcibly blowing air to a radiation fin exposed outside the Peltier element. An electronic cooling type cold / hot storage provided with an internal temperature sensor for detecting the internal temperature, and a controller for controlling the rotational speed of the fan so that the temperature detected by the internal temperature sensor reaches a set temperature. It is in the electronic cooling type cold storage room.

The controller may include voltage adjusting means for adjusting a voltage supplied to a fan motor for driving the fan according to a difference between the internal temperature and the set temperature.

[0010]

In the present invention, the rotation speed of the fan is controlled by the control means so that the inside temperature detected by the inside temperature sensor becomes the set temperature.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIG. In FIG. 1, 11 is a Peltier element, 14 is a fan motor, 21
Is a temperature sensor inside the storage compartment 16, and 17 is a cold storage compartment 10.
0 operation control switch, 18 controller, 22 power supply,
19 is earth. In the controller 18, voltage adjusting means for adjusting the voltage supplied to the fan motor is incorporated.

When the operation control switch 17 is turned on, the power supply is turned on.
The current from 22 is supplied to the Peltier element 11 and the fan motor 14 via the operation control switch 17 and the controller 18.

The controller 18 is an internal temperature sensor.
The voltage supplied to the fan motor 14 is adjusted according to the difference between the internal temperature detected by 21 and the set temperature.
Rotates at a speed corresponding to this supply voltage.

However, the number of revolutions of the fan 13 is controlled so that the temperature of the inside 16 becomes the set temperature, and the fan 13 does not stop as in the conventional case. It is possible to prevent the interior 16 from being warmed by flowing backward from 12 toward the metal electrode in the interior.

[0015]

According to the present invention, the number of revolutions of the fan is controlled so that the temperature inside the refrigerator detected by the temperature sensor inside the oven becomes the set temperature, and it is not stopped. Therefore,
Since the radiating fins are constantly cooled by the air blown from the fan, it is possible to prevent heat from flowing back from the radiating fins toward the metal electrodes inside the refrigerator. Further, since it is possible to prevent the fan from being frequently operated / stopped, it is possible to prevent the noise from being generated and to suppress the fluctuation of the in-compartment temperature.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a conventional electronic cooling type cold storage cabinet.

[Explanation of symbols]

 11 Peltier element 14 Fan motor 18 Controller 22 Power supply 17 Operation switch 21 Internal temperature sensor

Claims (2)

[Claims] 1. An electronic cooling type cold storage cabinet having a fan for forcedly blowing air to a radiation fin exposed outside the Peltier element, and an internal temperature sensor for detecting the temperature inside the cabinet, and a temperature detected by the temperature sensor. And a controller for controlling the number of revolutions of the fan so that the temperature becomes a set temperature. 2. The controller comprises voltage adjusting means for adjusting the voltage supplied to a fan motor for driving the fan in accordance with the difference between the internal temperature and the set temperature. Item 1. An electronic cooling type cold storage cabinet according to item 1.