JPH0312215A - Moistureproof storage container - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a moisture-proof cabinet used for storing equipment that dislikes humidity, such as cameras.

(Prior Art) Generally, a moisture-proof storage is provided with a dry unit containing a zeolite-based moisture absorbent inside the storage to keep the inside of the storage at low humidity.

In addition to the moisture absorbent, the dry unit has a built-in semiconductor heater to heat the moisture absorbent, and the semiconductor heater is operated periodically to prevent the moisture absorbent from absorbing too much moisture and losing its moisture absorption ability. That's what I do. That is,
The moisture contained in the moisture absorbent is released outside the refrigerator as water vapor to regenerate the moisture absorbent.

(Problem to be Solved by the Invention) However, in the conventional dry unit as described above, for example, the indoor temperature RT is 20°C and the humidity RH is 90%.
In this case, it takes about 3 hours for the humidity inside the refrigerator to drop to about 50% after the start of operation.

Furthermore, when the door is opened to take out and put in equipment, the humidity inside the refrigerator increases, and it takes a long time for the humidity to drop to a low level. For example, once the humidity inside the refrigerator rises to 80%, increase it to 50%.
It takes about 1 hour and 30 minutes to lower the temperature.

Such a situation in which it takes a long time is unfavorable for equipment that dislikes moisture, and there is room for improvement.

This invention was made in view of the above circumstances,
The purpose is to provide a moisture-proof cabinet that can bring the inside of the cabinet from a high-humidity state to a low-humidity stable state in a short period of time, and that can always provide an optimal storage environment for stored items. It is in.

[Structure of the Invention] (Means for Solving the Problems) A ventilation passage forming means provided in a refrigerator and forming a ventilation passage in the refrigerator, a drying unit provided in the ventilation passage and absorbing moisture, and a convection fan installed in the passageway.

(Operation) The air inside the refrigerator is forcibly circulated through the drying unit by the operation of the convection fan.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, 1 is the main body of the moisture-proof cabinet, which is made of wood.

A door 2 made of transparent glass is pivotally supported on the entire surface of the main body 1 so as to be openable and closable, and a storage compartment 3 is formed inside.

In the storage 3, a plate 4 serving as a ventilation path forming means is erected on the back side, and several sub-tiers of net shelves 5, 5.5 are attached to the plate surface of the plate 4.

These net shelves are for placing articles in a well-ventilated manner.

The back side of the plate 4 is a ventilation passage 6 that communicates in the vertical direction. A dry unit 7 and a convection fan 8 are provided at the top and bottom of the ventilation path 6, respectively.

That is, when the convection fan 8 operates, the air inside the storage 3 circulates through the drying unit 7 as shown by the arrow in the figure.

The dry unit 7 contains a zeolite-based moisture absorbent (not shown), and also includes semiconductor heaters 13 and 14, which will be described later, for heating and regenerating the moisture absorbent.

Further, the dry unit 7 has an internal shutter 11 for shielding from the atmosphere of the storage 3, and an external shutter 12 for ensuring communication with the outside through the back of the main body 1. have. The internal shutter 11 and external shutter 12 are interlocked with each other, and normally the internal shutter 11 is open and the external shutter 12 is closed, but the semiconductor heaters 13 and 14 heat the moisture absorbent. At the time of reproduction, the storage internal shutter 11 is closed and the external storage shutter 12 is opened.

The control circuit is shown in FIG.

Relay 2 is connected to commercial AC power supply 20 via door switch 21.
2 is connected. The door switch 21 is turned off when the door 2 is closed and turned on when the door 2 is opened.

A timer motor 24M of a timer 24 is connected to the power supply 20 via a humidistat 23.

The H21 midistat 23 is activated by sensing the humidity inside the storage 3, and is turned off when the humidity is 40% or less. The timer 24 includes a timer motor 24M and a timer switch (bidirectional contact) 24a, and operates the timer switch 24a for 30 minutes every 5 hours.

Connect the power supply 20, humidistat 23, and relay contacts (
A relay 25 is connected via the normally closed contact (22b) and the normally closed side of the timer switch 24a.

A timer motor 26M of a timer 26 is connected to the power supply 20 via a humidistat 23 and a relay contact (normally closed contact) 25a. The timer 26 is the timer motor 2
6M and a timer switch (bidirectional contact) 26a, and the timer switch 26a is activated when 30 minutes have passed from the start of energization.

The motor 8M of the convection fan 8 is connected to the il source 20 via the humidistat 23, the relay contact 25a1, and the normally closed side of the timer switch 26a.

A semiconductor heater 13.14 is connected to the power supply 20 via the humidistat 23 and the normally open side of the timer switch 24a.
parallel circuits are connected. The semiconductor heaters 13 and 14 are
It is incorporated into the dry unit 7 and heats and regenerates the moisture absorbent.

Explain the operation.

Articles are placed on the net shelves 5 in the storage 3, and the door 2 is closed. Then, the door switch 21 is turned off and the relay 22 is deenergized. In other words, the contact 22b is turned on.

On the other hand, the timer 24 is operating, and the timer switch 24
B operates for 30 minutes every 5 hours.

During the 5-hour period in which the timer switch 24a is inactive, the relay 25 is energized and the contact 25a is turned on.

When the contact 25a is turned on, the timer 26 operates and the fan motor 8M also operates.

In this way, by operating the convection fan 8, the air in the storage 3 is forcibly circulated through the moisture absorbent of the dry unit 7, and the moisture absorption capacity of the dry unit 7 is increased.

Then, when the timer 26 counts 30 minutes, the timer switch 26a is activated, the operation of the fan motor 8M is stopped, and the forced air circulation by the convection fan 8 is ended. In other words, the dry unit 7 returns to its normal moisture absorption capacity based on natural air circulation.

When the timer switch 24a is activated after 5 hours have elapsed,
The semiconductor heaters 13 and 14 are energized, and the heat generated by the semiconductor heaters 13 and 14 heats and regenerates the moisture absorbent in the dry unit 7. In this case, the storage internal shutter 11 of the dry unit 7 is closed and the external storage shutter 12 is opened, and the water vapor evaporated from the moisture absorbent is released to the outside of the storage.

When the timer switch 24a returns after 30 minutes,
The energization to the semiconductor heaters 13 and 14 is terminated, and the heating regeneration of the moisture absorbent is completed. In this case, the storage interior shutter 11 of the dry unit 7 opens and the exterior shutter 12 closes.
The moisture absorbent from which moisture has been removed is put into the atmosphere inside the storage 3.

Thereafter, when the door 2 is opened, the door switch 21 is turned on and the relay 22 is energized. In other words, the contact 22b is turned off.

When the contact 22b is turned off, the relay 25 is deenergized, the contact 25a is turned off, and the operation of the timer 26 is stopped (reset).

Then, when the door 2 is closed, the above-described operation is repeated, and the moisture absorption capacity of the dry unit 7 is increased for the first 30 minutes.

In this way, the convection fan 8 is operated immediately after the door 2 is closed, thereby forcibly circulating the air inside the storage 3 through the drying unit 7, thereby increasing the moisture absorption ability of the drying unit 7. , the inside of the storage 3 can be brought from a high humidity state to a low humidity stable state in a short time. Therefore, an optimal storage environment can always be obtained even for equipment that dislikes moisture.

Here, Fig. 4 shows the actual measurement of the humidity change inside the storage 3. Conventionally, it took more than 3 hours for the humidity to drop from 90% to 40% (dotted line). In this example, this could be achieved in about 30 minutes. Additionally, if the door 2 is opened for 3 minutes, the humidity inside the refrigerator 3, which was stored after the door 2 was closed, would rise to 80%, and it would take an hour and a half for the humidity to stabilize. However, in this example, the increase in humidity after the door 2 was closed could be suppressed to 60%, and the time required for the temperature to stabilize at low and lithium temperatures was significantly shortened to 30 minutes.

Furthermore, since the net shelf 5 is employed as the means for placing articles in the storage 3, the air circulation efficiency within the storage 3 is improved, which can greatly contribute to improving the moisture absorption capacity.

Further, since the dry unit 7 and the convection fan 8 are hidden behind the plate 4 and cannot be seen from outside the door 2, the design becomes neat.

Note that the operating time of the convection fan 8 and the regeneration timing of the moisture absorbent can be set as appropriate depending on the capacity of the storage 3, the size of the moisture absorbent, and the like.

In addition, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without changing the gist.

[Effects of the Invention] As described above, according to the present invention, a ventilation passage forming means is provided in a refrigerator and forms a ventilation passage in the refrigerator, a dry unit is provided in the ventilation passage and absorbs moisture, Since it is equipped with a convection fan installed in the ventilation path, it is possible to bring the inside of the refrigerator from a high humidity state to a low humidity stable state in a short time, thereby providing an optimal storage environment for stored items at all times. We can provide a moisture-proof warehouse that can

[Brief explanation of the drawing]

Fig. 1 is a front view of the external appearance of an embodiment of the present invention, Fig. 2 is a cross-sectional view of the internal configuration of the embodiment, and Fig. 3 is a diagram showing the configuration of the control circuit of the embodiment. 4 are diagrams showing changes in humidity inside the refrigerator in the same embodiment. 2... Door, 3... Storage, 4... Plate (ventilation path forming means) 6... Ventilation path, 7... Dry unit,
8... Convection fan.

Claims (1)

[Claims] It is characterized by comprising: a ventilation passage forming means provided in the refrigerator to form a ventilation passage in the refrigerator; a drying unit provided in the ventilation passage to absorb moisture; and a convection fan provided in the ventilation passage. A moisture-proof warehouse.