JPH0719745A - Low temperature clean drying machine - Google Patents

Abstract

PURPOSE:To enable a precision equipment or non-heat resistance equipment or sample pieces or the like to be dried at low temperature within a clean environment. CONSTITUTION:A dehumidifying cooler 5 and a heating condensor 6 are arranged within a easing 1 for use in storing a precision equipment or non-heat resistance equipment or a sample piece 2 or the like in it Gas passed through the cooler 5 and the condensor 6 is circulated within the easing 1 under operation of a blower 7. There is provided a high performance filter 8 for passing gas circulated by the blower 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention performs low-temperature drying in a clean environment in order to dry precision quantitative glass instruments, non-heat-resistant plastic instruments, samples, etc., which require cleanliness. It relates to a low temperature clean dryer.

[0002]

2. Description of the Related Art Conventionally, when cleaning glass instruments for precision measurement (hole pipettes, volumetric flasks, etc.) and plastic laboratory instruments with low heat resistance, which are used for chemical experiments, etc. The drying is promoted by taking time or by circulating warm air heated by a heater. However, such a conventional drying method has a problem that it takes a long time to dry when the humidity in the air is high.

Therefore, for example, a dryer having a structure as disclosed in Japanese Utility Model Publication No. 63-22478 (F26B9 / 02) is used, and the circulating gas is cooled and dehumidified by the cooler of the refrigeration cycle and heated by the condenser. Thus, a product for drying an article has been developed, and according to such a dryer, it becomes possible to rapidly dry the article, for example, by setting the set temperature to 40 ° C or lower.

[0004]

However, since such a conventional dryer cools and dehumidifies the air that has entered from the outside and heats it to directly circulate it, a large amount of dust and dirt are contained in the circulating gas. It was included, and in some cases, they contaminated the instruments and samples and impaired the accuracy of the experiment itself.

The present invention was made in order to solve the above-mentioned conventional technical problems, and it is possible to dry precision or non-heat-resistant equipment, samples, etc. at a low temperature in a clean environment. An object is to provide a low temperature clean dryer.

[0006]

A low-temperature clean dryer D of the present invention includes a box 1 for accommodating precision or non-heat-resistant equipment, a sample 2 or the like, and a dehumidifier provided in the box 1. Cooler 5 for heating and heater (condenser) 6 for heating,
A blower 7 that circulates the gas passing through the cooler 5 and the heater (condenser) 6 in the box body 1, and a high-performance filter 8 that passes the gas circulated by the blower 7 are provided. .

[0007]

According to the low temperature clean dryer D of the present invention, the gas circulated in the box 1 by the blower 7 is cooled by the dehumidifying cooler 5 and further heated by a heater (condenser). ) 6, it becomes low temperature and low humidity, and is circulated to the high performance filter 8. Since the high-performance filter 8 removes dust in the circulating gas, a clean, low-temperature and low-humidity environment is formed in the box 1. Therefore, by storing the device, the sample 2 and the like in the box body 1, it is possible to rapidly dry at low temperature while preventing contamination due to adhesion of dust and the like to them.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a vertical sectional view of a low temperature clean dryer D of the present invention, and FIG. 2 is a refrigerant circuit diagram of a refrigeration cycle R of the low temperature clean dryer D. The low-temperature clean dryer D of the present invention is installed in, for example, a laboratory of a laboratory, and 1 is a box constituting the main body of the low-temperature clean dryer D. Inside the box 1, there is formed a drying chamber 3 for accommodating precision quantitative glass instruments such as whole pipettes and volumetric flasks, non-heat-resistant plastic instruments, and samples (the above is indicated by reference numeral 2). The equipment and the sample 2 stored in the drying chamber 3 are dried.

A circulation passage 4 is formed by a duct plate 16 at the back and upper portion of the box 1 outside the drying chamber 3, and a cooler 5 and a condenser 6 as a heater are provided in the circulation passage 4 at the back. Are arranged side by side in the vertical direction (cooler 5 is below), and a suction port 13 for sucking gas in the drying chamber 3 is formed in a lower portion of the duct plate 16. Further, a blower 7 for circulation is provided in the upper circulation passage 4, and an outlet of the blower 7 is provided so as to face an upper surface of a high performance filter 8 (HEPA filter). The blower 7 is operated so as to suck up the gas in the circulation passage 4 at the back and pressure-feed it to the high-performance filter 8 from above. Further, the high-performance filter 8 is installed so as to face the upper part of the drying chamber 3, so that the gas blown from the blower 7 to the drying chamber 3 always passes through the high-performance filter 8. .

A machine room 10 for accommodating a compressor 9 constituting a refrigerating cycle R together with the cooler 5 and the condenser 6 is formed in the lower part of the box body 1. In addition, 11 is a drainage pipe for discharging the drain water of the cooler 5. Although the condenser 6 is provided above the cooler 5 in the embodiment, the cooler 5 may be provided above the condenser 6. The compressor 9, the condenser 6, the capillary tube 12, and the cooler 5 are sequentially connected in an annular shape as shown in FIG. 2 to form a refrigeration cycle R.

Next, the operation of the low-temperature clean dryer D of the present invention having the above-mentioned structure will be described. Turn on the provided operation switch (not shown).
As a result, the compressor 9 and the blower 7 are operated, so that the gas in the drying chamber 3 is sucked into the circulation passage 4 from the suction port 13 of the duct plate 16 formed in the back portion.
On the other hand, when the compressor 9 is operated, the high-temperature and high-pressure gas refrigerant discharged from the compressor 9 first radiates heat in the condenser 6 and exerts a heating action, and after being condensed and liquefied, the capillary tube 12 is condensed. It is decompressed, flows into the cooler 5, and evaporates to exert a cooling effect.

On the other hand, the gas sucked into the circulation passage 4 is first cooled by the cooler 5 while rising there. Due to this cooling action, the temperature of the gas is lowered, and the moisture in the gas is condensed in the cooler 5, so that the gas is dehumidified. After that, the gas passes through the cooler 5 and is heated by the condenser 6 provided above the cooler 5. Due to the cooling by the cooler 5 and the heating action by the condenser 6, the temperature of the gas becomes a low temperature of, for example, + 20 ° C. to + 40 ° C., and the humidity becomes extremely low. The temperature is arbitrarily set by a setting device (not shown), and the operation of the compressor 9 is controlled based on the set temperature. In addition, although the temperature at this time depends on the equipment to be dried and the sample 2, especially in the case of non-heat-resistant plastic equipment, the temperature range of + 20 ° C to + 40 ° C is set to prevent deterioration due to high temperature. Can be prevented.

As described above, the low-temperature and low-humidity gas is sucked by the blower 7 and pressure-fed to the high-performance filter 8. In the process of passing through the high-performance filter 8, dust and dirt in the gas are adsorbed and filtered, so that the inside of the drying chamber 3 below the high-performance filter 8 has a low temperature and low humidity and is in an extremely clean state. Will be blown out. The instrument and the sample 2 housed by such a clean low-temperature dry gas are rapidly dried. Moreover, since the gas is extremely clean, the occurrence of contamination due to the adhesion of dust can be prevented.

Although the condenser 6 of the refrigeration cycle R is used as the heater in the embodiment, the invention is not limited to this, and a general electric heater may be used. Also, it is effective to use an electronic cooling device using a Peltier device as the cooler.

[0015]

As described above in detail, according to the present invention, a box containing precision or non-heat-resistant equipment, samples, etc. is cooled by a dehumidifying cooler by a blower and used as a heater for heating. Since the low temperature and low humidity gas that has been cleaned by a high performance filter is circulated while being heated by the It will be able to be dried.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a low temperature clean dryer of the present invention.

FIG. 2 is a refrigerant circuit diagram of the refrigeration cycle of the low temperature clean dryer of the present invention.

[Explanation of symbols]

 1 Box 2 Equipment, etc. 5 Cooler 6 Condenser 7 Blower 8 High-performance filter D Low temperature clean dryer

Claims (1)

[Claims] 1. A box for accommodating precision or non-heat-resistant equipment, a sample or the like, a dehumidifying cooler and a heating heater provided in the box, and passing through these coolers and heaters. A low-temperature clean dryer, comprising: a blower for circulating the generated gas in the box, and a high-performance filter for passing the gas circulated by the blower.