JP3554860B2 - Drying equipment for low humidity storage - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a drying apparatus for a low-humidity storage, and more particularly to a drying apparatus for a low-humidity storage having an updraft forming means.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, a low-humidity storage as disclosed in Japanese Patent Application Laid-Open No. 7-163829 includes a sealed cabinet 1, a plurality of front doors 2a to 2d, for example, as shown in FIGS. 1 comprises a drying unit 3 having a desiccant disposed therein and heating means for regenerating the desiccant.
[0003]
FIG. 6 shows the details of the drying unit 3 used in such a low-humidity storage, wherein 4a is an outer case, 4b is an inner case, 5 is a desiccant case arranged in the inner case 4b, and 6 is this desiccant case 5 A desiccant filled in the desiccant, 7 is a desiccant heating means embedded in the desiccant 6, 8 is a control means of the heating means 7, and 9 and 10 communicate the inside of the cabinet 1 and the inside of the inner case 4b, respectively. Therefore, the openings 11 and 12 formed above and below the outer case 4a and the inner case 4b, the openings 13 and 12 formed above and below the cabinet 1 and the inner case 4b to communicate the outside of the cabinet 1 and the inside of the inner case 4b, respectively. A shutter pivotally supported at one end so that the upper and lower openings 10 and 12 of the inner case 4b can be alternately opened and closed.
[0004]
In such a low-humidity chamber, when the interior of the chamber is dehumidified, for example, the shutter 13 is driven by a driving means including a bias spring, a shape memory alloy coil, and an energization control means for the shape memory alloy coil, and the interior opening 10 is formed. Is closed, the outside opening 12 is opened, and the desiccant 6 is heated by the heater 7 for 40 minutes, for example, to release the moisture in the desiccant 6 to the outside of the compartment.
[0005]
Thereafter, for example, 30 to 40 minutes later, the inside opening 10 is opened and the outside opening 12 is closed. As a result, the water in the refrigerator is adsorbed by the desiccant 6 regenerated by heating.
[0006]
The above-mentioned dehumidification is performed once every 6 to 8 hours to keep the humidity inside the refrigerator low. However, such a general low humidity refrigerator can be dried for a long time as energy saving operation when the door is not opened frequently. The agent is not regenerated. In this case, the surroundings of the dryer in the low humidity chamber are low in humidity, but the circulating air flow is not generated, so that the humidity in the low humidity chamber does not decrease. Generally, in such a case, a circulation fan is provided as shown in the dehumidifier of Japanese Utility Model Registration No. 25662787.
[0007]
[Problems to be solved by the invention]
However, when the fan is operated continuously, the life of the bearing is shortened and noise is a problem.
[0008]
Further, in such a low-humidity storage, when the door is opened, for example, when the humidity in the storage is 5% RH and the humidity outside the storage is 60% RH, the humidity outside the storage enters the storage, and the door is opened once, for example, once. When the chamber is opened for 30 seconds, the humidity in the refrigerator rises to about 20% RH, and it takes about one hour until the humidity falls to 10% RH or less by the action of the drying unit.
[0009]
Such a device is not suitable for storing IC packages and the like.
[0010]
As a result of various experimental studies, the present inventor has formed a vertically extending through-hole in the drying unit 3 and provided a rising airflow forming means having a heating source on a straight line vertically passing through the through-hole and a circulating airflow generating fan. If it is used, the inside of the cabinet can be quickly reduced to a low humidity, and if the inside humidity of the cabinet becomes approximately 10% RH or less, even if the above-mentioned fan is operated continuously, almost no effect is obtained. There was found.
[0011]
The present invention has been made based on such findings.
[0012]
[Means for Solving the Problems]
The drying device for a low-humidity storage of the present invention comprises a humidity sensor disposed in a low-humidity storage cabinet, a drying unit, and switching means for switching the drying unit between the inside of the cabinet and the outside of the cabinet. However, a desiccant and a heating means for regenerating the desiccant, a vertically extending through hole, and a rising air flow forming means and a circulating air flow generating fan having a heating source arranged on a straight line passing vertically through the through hole. Wherein the heating source comprises a heating plate having a vertically extending surface, and the fan is activated only when the humidity in the low humidity cabinet becomes approximately 10% RH or more.
[0014]
Further, the heat source is two and the plate was allowed arranged laterally to each other so that the heat source to form an opening surface that faces to the through holes, that made more the heating element which is sandwiched the plates Features.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
In the present invention, as shown in FIGS. 1 and 2, the desiccant case 5 is a prismatic body having a rectangular cylindrical through hole 14 extending vertically, and is raised below the through hole 14. The airflow forming means 15 and the circulating airflow generating fan 16 are arranged.
[0017]
The rising air flow forming means 15 may be a simple heating element, but is preferably arranged in parallel with each other so as to form a vertically extending rectangular cylindrical opening substantially conforming to the cross section of the through hole 14 as shown in FIG. Of the air heating plates 15a and 15b, and a heating body (positive star) 15c sandwiched between intermediate portions of the air heating plates 15a and 15b.
[0018]
The fan 16 is activated only when the humidity in the cabinet 1 becomes approximately 10% RH or more by the humidity sensor 17 and the humidity controller 18 arranged in the cabinet 1.
[0019]
Since the drying device for a low-humidity storage of the present invention is configured as described above, the rising airflow generated by the rising airflow forming means 15 is transmitted through the through holes 14 in the upper desiccant case 5, the desiccant case 5, The gap between the inner cases 4b rises due to the chimney effect as shown by the arrow. Since the air inside and outside the regenerated desiccant case 5 is always low in humidity due to the diffusion motion of the water vapor molecules, the low-humidity air is released into the cabinet 1 on the rising airflow generated by the rising airflow generation means 15. Further, forced air circulation is generated by the fan 16, and the inside of the cabinet 1 is constantly maintained at a low humidity. When the humidity in the cabinet 1 becomes 10% RH or less, the fan 16 stops, and the life of the bearing is reduced. And power consumption can be reduced.
[0020]
The upward airflow forming means 15 may be provided in the upper part of the desiccant case 5 or in the through hole 14.
[0021]
Further, the air heating plate may be only one, and a heating element may be attached to the air heating plate. Further, the plate itself may generate heat without using a heating element.
[0022]
【The invention's effect】
As described above, according to the low humidity chamber of the present invention, the inside of the cabinet is constantly circulated by the updraft forming means and the fan, so that the inside of the cabinet can be constantly maintained at a low humidity, and the life of the fan can be greatly extended. There are big benefits.
[Brief description of the drawings]
FIG. 1 is a vertical sectional front view of a drying unit in a low-humidity storage of the present invention.
FIG. 2 is a front view of the low-humidity storage of the present invention.
FIG. 3 is a perspective view of an updraft forming means in the drying unit shown in FIG. 1;
FIG. 4 is a front view of a conventional low-humidity storage.
FIG. 5 is a side view of the low humidity chamber shown in FIG.
FIG. 6 is an explanatory diagram of a drying unit used in the low humidity chamber shown in FIG.
[Explanation of symbols]
Reference Signs List 1 sealed cabinet 2a front door 2b front door 2c front door 2d front door 3 drying unit 4a outer case 4b inner case 5 desiccant case 6 desiccant 7 desiccant heating means 8 control means 9 opening 10 opening 11 opening 12 opening 13 shutter 14 Through-hole 15 Ascending airflow forming means 15a Air heating plate 15b Air heating plate 15c Heating body (positive star)
16 Circulating airflow generating fan 17 Humidity sensor 18 Humidity controller

Claims (2)

A humidity sensor disposed in the low humidity cabinet, a drying unit, and switching means for switching and connecting the drying unit to either the inside of the cabinet or the outside of the cabinet, wherein the drying unit comprises a desiccant and a regeneration of the desiccant. Heating means, a vertically extending through hole, a rising air flow forming means having a heating source arranged on a straight line passing vertically through the through hole, and a circulating air flow generating fan, wherein the heating source extends vertically A drying apparatus for a low-humidity storage, comprising a heating plate having a surface, and operating only when the humidity in the low-humidity storage cabinet becomes approximately 10% RH or more. Two and plate was allowed arranged laterally to each other so that the heat source to form an opening surface that faces to the through hole, according to claim 1, characterized by comprising more the heating element sandwiched the plates Drying equipment for low humidity storage.

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