JPH0547763U - Refrigeration equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain ultra-low temperature while preventing deterioration of cooling performance. [Structure] A heat radiating portion 72 of a Peltier cooler 70 having a heat absorbing portion 71 arranged in a freezing chamber 50 is cooled by an evaporator 84 of a refrigerating cycle 80. [Effects] The heat radiation effect in the heat radiation portion 72 of the Peltier cooler 70 is promoted, and as a result, the heat transfer in the Peltier cooler 70 is performed in a low temperature range to obtain an ultra low temperature, and a refrigeration cycle in the ultra low temperature range. Since 80 is not placed,
It is possible to prevent the deterioration of the cooling performance due to the freezing of oil in the refrigeration cycle 80.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a refrigerating device used in, for example, an ultra-low temperature freezer.

[0002]

[Prior Art]

 Generally, in a refrigeration cycle using a CFC refrigerant, the temperature difference between the high temperature region and the low temperature region is about 80 degrees. Therefore, in order to obtain an ultra-low temperature range of −85 ° C. or lower, a technique using a multi-source refrigeration cycle provided with a plurality of refrigeration cycles is known.

FIG. 2 is a configuration diagram showing a conventional refrigeration system using a two-way refrigeration cycle. As shown in the figure, this refrigerating apparatus includes a high temperature side refrigeration cycle 10 in which a Freon refrigerant such as R502 (hereinafter referred to as "high boiling point refrigerant") is enclosed, and a Freon refrigerant such as R503 having a lower boiling point than R502. The low temperature side refrigerating cycle 20 (hereinafter referred to as “low boiling point refrigerant”) is enclosed. Then, the high boiling point refrigerant compressed in the compressor 11 of the high temperature side refrigeration cycle 10 is condensed in the condenser 12 and liquefied, and is decompressed and expanded in the capillary tube 13 and then in the low temperature side in the cascade condenser 14. Heat is absorbed from the low boiling point refrigerant of the refrigeration cycle 20 to be vaporized, and then returned to the compressor 11. On the other hand, the low boiling point refrigerant compressed by the compressor 21 of the low temperature side refrigeration cycle 20 is cooled by the high boiling point refrigerant in the cascade condenser 14 to be liquefied, decompressed and expanded in the capillary tube 23, and then evaporated. At 24, heat is absorbed from the freezer compartment 1 to be vaporized, and then returned to the compressor 21. In this way, the high-temperature side refrigeration cycle 10 condenses the low-boiling-point refrigerant in the low-temperature side refrigeration cycle 20 to obtain an ultra-low temperature of -85 ° C or lower.

FIG. 3 shows a block diagram of another conventional refrigeration system. As shown in the figure, the heat absorbing part 32a of the Peltier cooler 32 attached to the wall part of the freezer 30 is arranged in the freezing chamber 31, and the heat radiating part 32b is arranged in the machine room 33 outside the freezing chamber 31. It A cooling fan 34 for cooling the heat radiating portion 32b is installed in the machine room 33. In this refrigeration system, when power is supplied from the power supply section 35 to the Peltier cooler 32, the heat in the freezer compartment 31 is absorbed by the heat absorbing section 32a of the Peltier cooler 32 and radiated from the heat radiating section 32b. The inside is cooled. During this cooling operation, the temperature in the freezer compartment 31 is detected by the sensor 36 and input to the control device 37, and the control device 37 determines the amount of power supplied to the Peltier cooler 32 by the power supply unit 35 based on the detected temperature. The inside of the freezer compartment 31 is controlled to maintain a predetermined set temperature.

[0005]

[Problems to be solved by the device]

 However, in the refrigerating apparatus of FIG. 2, the temperature around the evaporator 24 of the low temperature side refrigeration cycle 20 becomes an extremely low temperature of −85 ° C. or less, so that the lubricating oil that has flowed out of the compressor 21 into the refrigerant path is evaporated. There was a problem in that the refrigerant was frozen in the periphery and the refrigerant path was blocked, thereby blocking the circulation of the cooling medium and lowering the cooling performance.

On the other hand, in the cooling device of FIG. 3, the main part of the Peltier cooler 32 is made of metal having high thermal conductivity, and the heat loss due to the transfer of heat to the metal part is large. The temperature difference between the heat radiation part 32b and the heat radiation part 32b is limited to about 80 degrees. Therefore, there is a problem that it is impossible to obtain an ultralow temperature of −85 ° C. or less.

An object of the present invention is to provide a refrigerating apparatus which solves the above-mentioned problems of the prior art and is capable of obtaining an ultra-low temperature range while preventing deterioration of cooling performance.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the refrigerating apparatus of the present invention is arranged such that a heat radiating portion of a Peltier cooler having a heat absorbing portion arranged inside the freezing chamber is arranged outside the freezing chamber, and a compressor, a condenser, a decompression means, and The evaporator of the refrigeration cycle including the evaporator is arranged in the vicinity of the heat radiating portion, and the heat radiating portion is cooled by heat exchange with the evaporator.

[0009]

According to the refrigerating apparatus of the present invention, the heat absorbing portion is arranged so that the heat radiating portion of the Peltier cooler arranged in the freezing chamber is cooled by the evaporator of the refrigeration cycle. As a result, the heat dissipation effect in the freezer is promoted, and as a result, the heat transfer from the heat absorption part to the heat dissipation part by the Peltier cooler is performed in the low temperature region, and an ultralow temperature can be obtained in the freezing compartment. In addition, since the refrigeration cycle is not installed in the cryogenic chamber, which is the ultra-low temperature range, it is possible to prevent the cooling performance from deteriorating due to oil freezing in the refrigeration cycle.

[0010]

【Example】

 FIG. 1 is a block diagram showing an ultra-low temperature freezer to which a refrigerating apparatus according to an embodiment of the present invention is applied. As shown in the figure, the freezer is provided with a freezer 40, a Peltier cooler 70, and a refrigeration cycle 80.

The substantially box-shaped freezer 40 includes a freezer main body 51 having an opening 52 formed on one surface side thereof, and a lid 54 which is openably and closably attached to the freezer main body 51 to close the opening 52 via a packing 53. It is composed of. Each of the main body 51 and the lid 54 of the freezer 40 has a surface portion formed of a metal panel 55, and a heat insulating material 56 is inserted inside.

A low temperature chamber 57 is formed in the inner wall of the freezer main body 51, and a Peltier cooler 70 is attached to the low temperature chamber 57 so that its heat absorbing portion 71 faces the freezing chamber 50.

On the other hand, the refrigeration cycle 80 includes a compressor 81, a condenser 82, pressure reducing means such as a capillary tube 83, an evaporator 84 housed in the low temperature chamber 57, and a refrigerant path connecting them. The refrigeration cycle 80 is filled with a refrigerant such as R502. Further, the evaporator 84 is arranged so as to be in contact with the heat dissipation portion 72 of the Peltier cooler 70, whereby the heat dissipation portion 72 is cooled by heat exchange with the evaporator 84.

Temperature detection sensors 61 and 62 are arranged in the freezer compartment 50 and the low temperature compartment 57, and these sensors 61 and 62, a power supply section 63 for supplying power to the Peltier cooler 70, and a compressor. 81 and 81 are connected to the control device 100, respectively.

In this freezer, when an operation start command is given to the control device 100, the compressor 81 is driven and power supply to the Peltier cooler 70 is started. As a result, the high-temperature CFC refrigerant discharged from the compressor 81 is condensed and liquefied by the condenser 82, decompresses and expands in the capillary tube 83, and then heats from the heat radiating portion 72 of the Peltier cooler 70 in the evaporator 84. Is vaporized and returned to the compressor 81.

Further, in the Peltier cooler 70, the heat in the freezer compartment 50 is absorbed by the heat absorbing portion 71 and released from the heat radiating portion 72, and thus heat is moved from the heat absorbing portion 71 toward the heat radiating portion 72, so that the freezer compartment is cooled. The inside of 50 is cooled. At this time, the heat radiating portion 72 side is cooled by the evaporator 84 of the refrigeration cycle 80, so that the heat radiating action in the heat radiating portion 72 is promoted, and consequently the heat transfer in the Peltier cooler 70 is performed in the low temperature region. The inside of the chamber 50 is cooled to an ultra low temperature. For example, when the ambient temperature of the device is room temperature, the temperature difference between the heat absorbing side and the heat radiating side of the Peltier cooler 70 and the refrigeration cycle 80 is about 80 degrees as described above. Even if the loss is taken into consideration, the inside of the freezing chamber 50 can be cooled to an ultra-low temperature of −85 ° C. or less.

On the other hand, while the freezer is being driven, the temperatures in the freezer compartment 50 and the low temperature compartment 57 are detected by the temperature sensors 61 and 62 one by one and input to the control device 100. Control the amount of power supplied to the Peltier cooler 70 by the power supply unit 63 so as to be equal to the preset temperature, and keep the temperature in the low temperature chamber 57 within the preset temperature range. The compressor 81 is driven and stopped.

According to this freezer, the heat absorbing portion 71 is configured to cool the heat radiating portion 72 of the Peltier cooler 70 arranged in the freezer compartment 50 by the evaporator 84 of the refrigeration cycle 80, and thus the Peltier cooler. The heat radiating action of the heat radiating portion 72 of the 70 is promoted, and as a result, the heat transfer in the Peltier cooler 70 is performed in the low temperature region, and the inside of the freezing chamber 50 can be cooled to an ultra low temperature.

Further, since the refrigeration cycle 80 is arranged outside the freezing chamber 50, which is an ultra-low temperature region, it is possible to prevent the cooling performance from deteriorating due to oil freezing in the freezing / freezing cycle 80.

Further, when compared with the conventional refrigeration system using the dual refrigeration cycle shown in FIG. 2, since the number of compressors having a high failure occurrence rate is from two to one, the occurrence of failures is halved. The device is highly reliable and the operating noise is low.

[0021]

[Effect of the device]

 As described above, according to this refrigeration system, the heat radiating portion of the Peltier cooler having the heat absorbing portion arranged in the freezing chamber is cooled by the evaporator of the refrigeration cycle. The heat transfer effect in the Peltier cooler is accelerated, and as a result, the heat transfer in the Peltier cooler is performed in a low temperature range to obtain an ultra-low temperature. It is possible to obtain the effect of preventing the deterioration of the cooling performance due to the above.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a freezer to which a refrigerating apparatus according to an embodiment of the present invention is applied.

FIG. 2 is a configuration diagram showing a refrigerating apparatus to which a conventional dual refrigeration cycle is applied.

FIG. 3 is a configuration diagram showing another conventional refrigeration system.

[Explanation of symbols]

 50 Freezing Room 70 Peltier Cooler 71 Heat Absorbing Part 72 Heat Dissipating Part 80 Refrigeration Cycle 81 Compressor 82 Condenser 83 Capillary Tube 84 Evaporator

Claims (1)

[Scope of utility model registration request] 1. An evaporator of a refrigerating cycle comprising a compressor, a condenser, a pressure reducing means and an evaporator, and a heat radiating portion of a Peltier cooler having a heat absorbing portion arranged in the freezing chamber, arranged outside the freezing chamber. Is disposed in the vicinity of the heat radiating portion, and the heat radiating portion is cooled by heat exchange with the evaporator.