JP2010283183A - Electric-electronic device storage box and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric-electronic device storage box, configured such that dew condensation in the box can be sufficiently inhibited by sufficiently absorbing and releasing moisture according to humidity change within the box, and to provide a method for manufacturing the same. <P>SOLUTION: The electric-electronic storage box 1 includes: an electric-electronic device storage box body 2 having a moisture permeability of 150-4,000 mg/(h hPa m<SP>3</SP>); and a humidity control plate 3 disposed within the box body 2, and having a moisture absorption rate coefficient of 0.065-0.09 (L/h) and a moisture absorption capacity of 500-830 g/m<SP>2</SP>. The storage box 1 satisfies expression (1): Y≥(1.5×10<SP>-4</SP>X+0.22)V/0.7, wherein X is the moisture permeability (mg/(h hPa m<SP>3</SP>)) of the box body 2, V is the capacity (m<SP>3</SP>) of the box body 2, and Y is the surface area (m<SP>2</SP>) of one side of the humidity control plate 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric / electronic device storage box in which a humidity control plate having humidity control performance is disposed, and a method for manufacturing the same.

  The electrical / electronic equipment storage box contains a distribution board that distributes high-voltage power supplied from the power plant, an operation panel for operating the power equipment, communication equipment, and electronic components for machine control. It is stored in.

  In the electric / electronic device storage box, when power is supplied, the temperature in the box is relatively high and the humidity is relatively low. However, when the supply of electric power is stopped, the temperature in the box rapidly decreases and the humidity in the box increases rapidly. As a result, condensation may occur in the box, or electrical insulation or electrical leakage may occur in electrical or electronic equipment.

  In particular, the above-described problems are likely to occur in electrical / electronic equipment storage boxes installed outdoors. According to observation records from the Japan Meteorological Agency, the temperature dropped by about 20 ° C in one hour and about 22 ° C in day and night. Therefore, in a box installed outdoors, the temperature in the box may rapidly decrease due to changes in the external environment, and the humidity in the box may increase rapidly.

  Conventionally, in order to solve the above problems, it has been proposed to arrange a humidity control member in a box. For example, Patent Document 1 below discloses a configuration in which a humidity control member made of a water-absorbing polymer is arranged in a box.

JP 2003-134618 A

  In patent document 1, since the humidity control member which consists of a water absorption polymer is arrange | positioned in the box, when the humidity in a box becomes high, a humidity control member will absorb water vapor | steam. Further, when the humidity in the box becomes low, the humidity control member releases water vapor. Therefore, the humidity change in the box can be reduced.

  However, as described in Patent Document 1, even if the humidity control member is arranged in the electric / electronic device storage box, sufficient moisture absorption / release performance cannot be obtained, and condensation may occur in the box.

  Moreover, in order to obtain the humidity control effect by the humidity control member, it is important that the inside of the box is blocked from the outside. However, in a practical electrical / electric equipment storage box, the inside of the box may communicate with the outside around the packing or the floor cable. Also, a small opening may be provided in the box to dissipate the heat in the box. In such a box, a lot of moisture flows into the box from the outside, and exceeds the saturated adsorption amount of the humidity control member in a short time. For this reason, the humidity control performance of the humidity control member may not be exhibited.

  An object of the present invention is to provide an electric / electronic device storage box that can sufficiently absorb and release moisture in accordance with a change in humidity in the electric / electronic device storage box and sufficiently suppress dew condensation in the box, and a method for manufacturing the same. It is.

According to the present invention, a moisture transmission rate of 150 to 4,000 mg / (h · hPa · m ³ ) is disposed in the electric / electronic device storage box main body, and the electric / electronic device storage box main body. A humidity control plate having a speed coefficient of 0.065 to 0.09 (1 / h) and a moisture absorption capacity of 500 to 830 g / m ² , and the moisture permeability (mg / kg) of the electric / electronic device storage box body. (H · hPa · m ³ )) is X, the volume (m ³ ) of the electrical / electronic device storage box body is V, and the surface area (m ² ) of one side of the humidity control plate is Y In addition, an electric / electronic device storage box that satisfies the following formula (1) is provided.

Y ≧ (1.5 × 10 ⁻⁴ X + 0.22) V / 0.7 Formula (1)

Further, according to the present invention, the moisture absorption rate coefficient is 0.065 to 0.09 using the electric / electronic device storage box body having a moisture permeability of 150 to 4,000 mg / (h · hPa · m ³ ). Using a humidity control plate having a (1 / h) and moisture absorption capacity of 500 to 830 g / m ² , the moisture transmission rate (mg / (h · hPa · m ³ )) of the electric / electronic device storage box body is determined. When X is X, the volume (m ³ ) of the electrical / electronic device storage box body is V, and the surface area (m ² ) of one surface of the humidity control plate is Y, the following formula (1) is satisfied. In addition, a method for manufacturing an electrical / electronic device storage box is provided in which the humidity control plate is disposed in the electrical / electronic device storage box body.

Y ≧ (1.5 × 10 ⁻⁴ X + 0.22) V / 0.7 Formula (1)

In the electric / electronic device storage box and the manufacturing method thereof according to the present invention, the moisture permeability of the electric / electronic device storage box body is 150 to 4,000 mg / (h · hPa · m ³ ), and the humidity control plate The moisture absorption rate coefficient is 0.065 to 0.09 (1 / h), the moisture absorption capacity is 500 to 830 g / m ² , and the humidity is adjusted in the electric / electronic device storage box body so as to satisfy the above formula (1). Since a board is arrange | positioned, sufficient moisture absorption / release performance can be obtained. Therefore, it is possible to sufficiently suppress the occurrence of condensation in the electric / electronic device storage box body.

FIG. 1 is a perspective view of an electric / electronic device storage box according to an embodiment of the present invention. 2A and 2B are perspective views showing an example of a humidity control plate used in the electric / electronic device storage box according to the embodiment of the present invention. FIG. 3 is a side view showing a modification of the humidity control plate. FIG. 4 is a diagram illustrating changes in temperature and humidity over time of the electrical / electronic device storage box of the first embodiment. FIG. 5 is a diagram illustrating changes in temperature and humidity with the passage of time of the electrical / electronic device storage box of the second embodiment. FIG. 6 is a diagram illustrating changes in temperature and humidity over time of the electric / electronic device storage box of Example 3. FIG. 7 is a diagram illustrating changes in temperature and humidity over time of the electrical / electronic device storage box of Comparative Example 1. FIG. FIG. 8 is a diagram for explaining a method of measuring the moisture absorption rate coefficient and the moisture absorption capacity.

  Hereinafter, the present invention will be clarified by describing specific embodiments and examples of the present invention with reference to the drawings.

  FIG. 1 is a perspective view of an electric / electronic device storage box according to an embodiment of the present invention.

  An electric / electronic device storage box 1 shown in FIG. 1 includes an electric / electronic device storage box main body 2 and a humidity control plate 3 arranged in the electric / electronic device storage box main body 2. The electric / electronic device storage box 1 is an electric / electronic device storage box provided with a humidity control plate. An electrical / electronic device 11 is accommodated in the electrical / electronic device storage box body 2. The electric / electronic device 11 is an electric device or an electronic device.

  The electric / electronic device storage box body 2 is a box in which various electric / electronic devices 11 such as a switchboard or electronic control parts are stored. The electric / electronic device storage box body 2 may be disposed indoors or outdoors depending on the application.

  As shown in FIG. 1, the electrical / electronic device storage box body 2 includes a box 2a and a door 2b. The door 2b is attached to the box 2a by the hinge member 12 so that it can be opened and closed. The box 2a and the door 2b are formed of metal, alloy, resin, or the like. Examples of the metal or alloy material include iron, stainless steel, and aluminum.

  In the electric / electronic device storage box main body 2, one or more electric / electronic devices 11 are stored. In the present embodiment, the electric / electronic device 11 is fixed to the inner surface 2 c of the electric / electronic device storage box body 2. The type of the electric / electronic device 11 is not particularly limited. Examples of the electric / electronic device 11 include various electronic components such as a distribution board, an operation panel, or a communication device.

The moisture permeability of the electric / electronic device storage box body 2 is in the range of 150 to 4,000 mg / (h · hPa · m ³ ). When the moisture permeability is smaller than 150 mg / (h · hPa · m ³ ), when the inside of the electrical / electronic device storage box body 2 is temporarily opened under high humidity by opening and closing the door 2b, Moisture accumulates in the electrical / electronic device storage box body 2, and condensation tends to occur due to a temperature difference. When the humidity transmittance exceeds 4,000 mg / (h · hPa · m ³ ), a large amount of moisture flows from the outside into the electric / electronic device storage box body 2, and condensation cannot be sufficiently suppressed over a long period of time. A preferable lower limit of the moisture permeability is 160 mg / (h · hPa · m ³ ), and a preferable upper limit is 3,000 mg / (h · hPa · m ³ ).

  The moisture permeability can be measured as follows.

  First, the electrical / electronic device storage box body is placed in an environment of 23 ° C., relative humidity 95%, and wind speed 0 to 0.1 m / s. For example, the door is opened and the dried calcium chloride is placed in the electric / electronic device storage box body. In addition, a humidity sensor is arranged in the center of the internal space of the electric / electronic device storage box body and directly above the calcium chloride. Next, for example, the door is closed, the electric / electronic device storage box body is sealed, and left for 24 hours. After 24 hours, the door is opened and the weight of calcium chloride is measured. At this time, it is confirmed that calcium chloride is dissolved and not liquefied. Further, the relative humidity at the center of the internal space and the relative humidity immediately above the calcium chloride are measured. After the measurement, for example, the door is closed, the electric / electronic device storage box body is sealed, and left for another 24 hours. After 24 hours, that is, 48 hours after the start of the test, the door is opened and the weight of calcium chloride is measured. Further, the relative humidity at the center of the internal space and the relative humidity immediately above the calcium chloride are measured. About the measured relative humidity, water vapor pressure conversion is performed using the saturated water vapor pressure of 28.09 hPa of 23 degreeC. From the measured value obtained, the moisture permeability after 24 hours and the moisture permeability after 48 hours can be obtained from the following formula (2). The average value of the moisture permeability after 24 hours and the moisture permeability after 48 hours is defined as the moisture permeability of the electric / electronic device storage box body.

Moisture permeability = [W1 / (P1-P2)] / V (2)
W1: Weight change per unit time (mg / h)
P1: Water vapor pressure of external environment (hPa)
P2: Water vapor pressure just above calcium chloride (hPa)
V: Volume of electric / electronic device storage box body (m ³ )

  As a method of adjusting the moisture permeability, a method of providing an opening for heat dissipation, etc., a cable hole for introducing an underground cable from the floor surface, etc., a cable is introduced into the hole, For the contact part of the cable, there are a method of filling the putty, a method of providing a packing on the door, and the like.

  As shown in FIG. 1, a plurality of humidity control plates 3 are attached to the inner surface 2 c of the electric / electronic device storage box body 2. The humidity control plate 3 is plate-shaped. The humidity control plate 3 is a plate-shaped humidity control member that absorbs and releases moisture according to the relative humidity in the environment where the humidity control plate 3 is disposed.

  The humidity control plate 3 can be formed of, for example, an inorganic porous material. Examples of the inorganic porous material include amorphous silica and silicate compounds. The humidity control plate 3 preferably contains at least one of amorphous silica and silicate compounds.

  Specific examples of the silicate compound include clay minerals such as allophane, imogolite, vermiculite, palygorskite, and diatomaceous earth.

  The humidity control plate 3 is preferably a carbonated cured body obtained by reacting a calcium silicate compound with pressurized carbon dioxide. Examples of the calcium silicate compound include calcium silicate hydrate such as cement hydrate or tobermorite, and calcium silicate anhydrate such as cement or wollastonite (wollastonite).

  The moisture absorption rate coefficient of the humidity control plate 3 is in the range of 0.065 to 0.09 (1 / h). When the moisture absorption rate coefficient is within the above range, even if the temperature rapidly decreases, it is difficult for the humidity to rapidly increase. The preferable lower limit of the moisture absorption rate coefficient is 0.07 (1 / h), and the preferable upper limit is 0.08 (1 / h).

The moisture absorption capacity of the humidity control plate 3 is in the range of 500 to 830 g / m ² . When the moisture absorption capacity is within the above range, for example, even if it rains for a long period of time, sufficient moisture absorption / release performance can be exhibited. That is, even if the external environment is maintained for a long time in a high humidity state, the moisture absorption / release performance is hardly saturated.

  The moisture absorption rate coefficient and the moisture absorption capacity can be measured as follows.

  The aluminum seal covers one side and the end surface of the humidity control plate so that only one side of the humidity control plate is exposed. The aluminum seal prevents moisture from passing through the humidity control plate. Next, the sealed humidity control plate is transferred to an environment of 23 ° C. and a relative humidity of 50%, and left until the weight reaches equilibrium. Next, the humidity control plate is transferred to an environment of 23 ° C., relative humidity 95 ± 1%, and wind speed 0.8 ± 0.2 m / s, and the amount of weight increase of the sealed humidity control plate is measured over time. . As shown in FIG. 8, with the time as a variable, the weight increment is approximated by the following equation (3), and the moisture absorption rate coefficient and the moisture absorption capacity are determined by the least square method. In addition, a weight increment is the value which divided the said weight increase amount by the area of the single side | surface of the humidity control material which is not sealed.

W = A (1-e ^−kt ) (3)
W: Weight increment (g / m ² )
A: Hygroscopic capacity (g / m ² )
k: Moisture absorption rate coefficient (1 / h)

  As a method of adjusting the moisture absorption rate coefficient, the pore volume or pore size distribution of several μm to several hundred μm is obtained by changing the degree of communication of the pore structure of the humidity control material or the particle size distribution constituting the pores. The method etc. which change are mentioned.

  Examples of the method for adjusting the moisture absorption capacity include a method for changing the pore volume or pore size distribution having a diameter of several nanometers.

  Examples of the molding method for controlling the pore size distribution include a method in which calcium silicate or the like is reacted with pressurized carbon dioxide and cured.

In this embodiment, the moisture permeability (mg / h · hPa · m ³ ) of the electrical / electronic device storage box body 2 is X, and the volume (m ³ ) of the electrical / electronic device storage box body 2 is V. And when the surface area (m ² ) of one surface of the humidity control plate 3 is Y, the following formula (1) is satisfied.

Y ≧ (1.5 × 10 ⁻⁴ X + 0.22) V / 0.7 Formula (1)

  The feature of this embodiment is that the moisture transmission rate of the electric / electronic device storage box body 2 and the moisture absorption rate coefficient and the moisture absorption capacity of the humidity control plate 3 are controlled within the specific range, and the equation ( The humidity control plate 3 is arranged in the electric / electronic device storage box body 2 so as to satisfy 1). In other words, using the electrical / electronic device storage box body 2 in which the moisture permeability is in the specific range, and the humidity control plate 3 in which the moisture absorption rate coefficient and the moisture absorption capacity are in the specific range, Further, the humidity control plate 3 is arranged in the electric / electronic device storage box main body 2 so as to satisfy the above formula (1).

  The inventor of the present application, in order to sufficiently suppress the dew condensation by the humidity control plate 3, the moisture permeability of the electrical / electronic device storage box body 2, the moisture absorption speed coefficient and the moisture absorption capacity of the humidity control plate 3, It has been found that it is extremely important to properly control the relationship between the moisture permeability X, the volume V and the surface area Y.

  By controlling the moisture transmission rate, the moisture absorption rate coefficient, and the moisture absorption capacity within the specific range, and further satisfying the formula (1), the moisture absorption and desorption can be sufficiently absorbed, and the dew condensation in the box can be sufficiently achieved. Can be suppressed. Moreover, even if the usage-amount of the humidity control board 3 is small, dew condensation can fully be suppressed.

  In addition, the said Formula (1) is a formula derived from the below-mentioned Example. By the below-mentioned Example, when satisfy | filling said Formula (1), it can confirm that dew condensation can be suppressed.

  The conditions under which condensation occurs in the electrical / electronic device storage box are determined by the outdoor environment in which the storage box is placed, the specification of the storage box, and the like. Examples of the outdoor environment include temperature, humidity, and rainfall. The specifications of the storage box include the installation condition of the door packing, the sealing state of the cable hole, and the degree of opening with respect to the volume of the storage box. The above formula (1) is a formula derived as a result of repeated field experiments under various conditions in designing an anti-condensation storage box applied throughout Japan.

  In the present embodiment, three humidity control plates 3 are attached to the inner surface 2c of the electrical / electronic device storage box body 2. However, the number of humidity control plates arranged in the electric / electronic device storage box body 2 is not particularly limited. Only one humidity control plate may be disposed, or two or more humidity control plates may be disposed. When a plurality of humidity control plates are used, the surface area Y indicates the total surface area of one surface of the plurality of humidity control plates.

  In addition, the planar shape of the humidity control plate 3 is a rectangular shape. However, the planar shape of the humidity control plate 3 is not particularly limited. For example, the planar shape of the humidity control plate 3 may be circular, elliptical, or oval.

  FIGS. 2A and 2B are perspective views showing the humidity control plate 3 used in the electric / electronic device storage box 1 shown in FIG.

  A through-hole penetrating the humidity control plate 3 is formed in the area near the square of the humidity control plate 3 from the first main surface 3a to the second main surface 3b.

  As shown in FIGS. 2A and 2B, the humidity control plate 3 is housed in an electrical / electronic device in a portion where the through hole on the first main surface 3a side is formed. A plurality of magnets 22 for fixing to the inner surface 2c of the box body 2 are attached. The magnet 32 has a rectangular plate shape. A through hole is provided in the center of the magnet 22.

  The bolt 21 into which the washer is inserted is inserted into the through hole of the magnet 22 and then inserted into the through hole of the humidity control plate 3 from the first main surface 3a side. The bolt 21 protrudes from the second main surface 3b. A washer 23 is extrapolated to a portion protruding from the second main surface 3b of the bolt 21, and a nut 24 is further attached. Thereby, the magnet 22 is attached to the first principal surface 3 a side of the humidity control plate 3.

  The humidity control plate 3 is attached to the inner surface 2c of the electric / electronic device storage box body 2 by the magnetic force of the magnet 22 from the first main surface 3a side.

  In order to absorb and release moisture on both surfaces of the humidity control plate 3, the distance between the outer surface of the humidity control plate 3 and the surface of another member such as the inner surface 2c of the electrical / electronic device storage box body 2 is 2 mm or more. Preferably there is. By setting the thickness of the magnet 22 to 2 mm or more, the distance between the outer surface and the inner surface 2c of the humidity control plate 3 can be set to 2 mm or more.

  FIG. 3 shows a modification of the humidity control plate 3. An attachment component 32 is attached to the humidity control plate 31 shown in FIG. The attachment component 32 includes a pair of sandwiching members 33 and 34.

  The material of the sandwiching members 33 and 34 is not particularly limited. The sandwiching members 33 and 34 are preferably made of a ferromagnetic material such as iron or nickel or an alloy containing a ferromagnetic material. In this case, the magnet 35 adheres to the sandwiching member 33 by magnetic force.

  A biasing member 36 is disposed between the pair of sandwiching members 33 and 34. The urging member 36 urges the tip portions of the pair of sandwiching members 33 and 34 so as to approach each other. The urging member 36 can be constituted by an elastic body such as a compression coil spring or a leaf spring, for example.

  A magnet 35 is fixed to one sandwiching member 33 of the pair of sandwiching members 33 and 34.

  Further, another attachment component 32 in which the humidity control plate 31 is narrowed is attached to the sandwiching member 34 of the attachment component 32 by the magnetic force of the magnet 35. In FIG. 3, the laminated body of the humidity control board by which the three humidity control boards 31 were laminated | stacked by the some attachment component 32 at intervals is shown.

  The humidity control plate 31 can be attached to the inner surface 2 c of the electric / electronic device storage box body 2 by the magnetic force of the magnet 35 in a state where the humidity control plate 31 is sandwiched between the pair of sandwiching members 33 and 34. That is, the humidity control plate 31 can be attached to the inner surface 2c of the electric / electronic device storage box main body 2 by fixing the attachment component 32 to the inner surface 2c of the electric / electronic device storage box main body 2.

  A laminated body of humidity control plates may be disposed in the electric / electronic device storage box body 2. In this case, many humidity control plates 3 can be attached to the inner surface 2c having a limited area. When a laminated body of humidity control plates is disposed, the interval between the humidity control plates is preferably 2 mm or more.

  In addition, the arrangement | positioning method of the humidity control board in the electric / electronic equipment box main body 2 is not limited to the method mentioned above.

  Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. The present invention is not limited only to the following examples.

Example 1
Volume (V) is 0.0256m ^3, and the measured moisture permeability by a measurement method described below was prepared an electric or electronic device-accommodating box body is ^{163mg / (h · hPa · m} 3).

  Moreover, the humidity control board was obtained as follows.

25 parts by weight of palygorskite (200 mesh under product, manufactured by Australia, manufactured by Showa KDE), 60 parts by weight of wollastonite (H1250F, manufactured by Shimizu Industries), 4 parts by weight of pulp fiber, and 300 parts by weight of water are commercially available Were mixed and dehydrated with a mixer, and a molded product having a water content of 30% was cured with pressurized carbon dioxide under conditions of 0.9 MPa and 90 ° C. to obtain a cured product having a thickness of 5.5 mm and a bulk specific gravity of 1.3. . The obtained cured body was cut so that the surface area on one side was 0.06 m ² to obtain a humidity control plate.

  The humidity control plate obtained in the electric / electronic device storage box body was arranged to obtain an electric / electronic device storage box.

(Example 2)
An electric / electronic device storage box main body similar to that in Example 1 was prepared.

Moreover, the humidity control board was obtained like Example 1 except having cut | disconnected the obtained hardening body so that the surface area of one side might be set to 0.03 m < ² >.

  The humidity control plate obtained in the electric / electronic device storage box body was arranged in the same manner as in Example 1 to obtain an electric / electronic device storage box.

(Example 3)
Volume (V) is 0.0256m ^3, and the measured moisture permeability by a measurement method described below was prepared an electric or electronic device-accommodating box body is ^{404mg / (h · hPa · m} 3).

  Further, a humidity control plate was obtained in the same manner as in Example 1 except that the palygorskite (200 mesh under product, manufactured in Australia, manufactured by Showa KDE Co.) was changed to palygorskite (produced in China).

  The humidity control plate obtained in the electric / electronic device storage box body was arranged in the same manner as in Example 1 to obtain an electric / electronic device storage box.

(Comparative Example 1)
Volume (V) is 0.0256m ^3, and the measured moisture permeability by a measurement method described below was prepared an electric or electronic device-accommodating box body is ^{4039mg / (h · hPa · m} 3).

Moreover, the humidity control board was obtained like Example 1 except having cut | disconnected the obtained hardening body so that the surface area of one side might be set to 0.02 m < ² >.

  The humidity control plate obtained in the electric / electronic device storage box body was arranged in the same manner as in Example 1 to obtain an electric / electronic device storage box.

(Evaluation of Examples 1 to 3 and Comparative Example 1)
(1) Moisture permeability The electrical / electronic device storage box body was placed in an environment of 23 ° C., relative humidity 95%, and wind speed 0 m / s. The door of the electric / electronic device storage box body was opened, and 500 g of dried calcium chloride was placed in the electric / electronic device storage box main body per volume (V) of 0.0256 m ³ of the electric / electronic device storage box main body. Moreover, the humidity sensor was arrange | positioned in the center of the internal space in an electrical / electronic equipment storage box, and just above calcium chloride. Next, the door was closed and the electric / electronic device storage box body was sealed and left for 24 hours. After 24 hours, the door was opened and the weight of calcium chloride was measured. At this time, it was confirmed that calcium chloride was dissolved and not liquefied. Further, the relative humidity at the center of the internal space and the relative humidity immediately above the calcium chloride were measured. After the measurement, the door was closed, the electric / electronic device storage box body was sealed, and left for another 24 hours. After 24 hours, that is, 48 hours after the start of the test, the door was opened and the weight of calcium chloride was measured. Further, the relative humidity at the center of the internal space and the relative humidity immediately above the calcium chloride were measured. About the measured relative humidity, water vapor pressure conversion was performed using the saturated water vapor pressure of 28.09 hPa of 23 degreeC. From the obtained measurement value, the moisture permeability after 24 hours and the moisture permeability after 48 hours were determined by the above formula (2). The average value of the moisture permeability after 24 hours and the moisture permeability after 48 hours was taken as the moisture permeability of the electric / electronic device storage box body.

(2) Moisture absorption rate coefficient and moisture absorption capacity One surface and the end surface of the humidity control plate were covered with an aluminum seal so that only one surface of the humidity control plate was exposed. Moisture did not pass through the seal area. Next, the sealed humidity control plate was moved to an environment of 23 ° C. and a relative humidity of 50%, and the sealed humidity control plate was left until the weight reached equilibrium. Next, the humidity control plate was transferred to an environment of 23 ° C., a relative humidity of 95%, and a wind speed of 0.8 ± 0.2 m / s, and the weight increase amount of the humidity control plate was measured over time. As shown in FIG. 8, with the time as a variable, the weight increment was approximated by the above equation (3), and the moisture absorption rate coefficient and the moisture absorption capacity were determined by the least square method.

(3) Temperature and humidity change in electrical / electronic device storage box The electrical and electronic device storage boxes of Examples 1 and 2 were evaluated for temperature and relative humidity over 5 days. Further, the electrical and electronic equipment storage boxes of Example 3 and Comparative Example 1 were evaluated for temperature and relative humidity over 18 days.

(4) Presence or absence of condensation The electrical / electronic device storage box was left outdoors for one month to evaluate the presence or absence of condensation. The table below shows the results when the relative humidity in the electrical / electronic device storage box is maintained at less than 100%, and the case where the relative humidity in the electronic device storage box reaches 100% is indicated as “x”. It was shown in 1.

  The results are shown in Table 1 below.

  The results of evaluating the temperature and humidity changes in the (3) electrical / electronic device storage box are shown in FIGS. The evaluation result of Example 1 is shown in FIG. 4, the evaluation result of Example 2 is shown in FIG. 5, the evaluation result of Example 3 is shown in FIG. 6, and the evaluation result of Comparative Example 1 is shown in FIG. 4 to 7, changes in the temperature and relative humidity of the outside air are indicated by broken lines, and changes in the temperature and relative humidity in the electric / electronic device storage box are indicated by solid lines.

  As shown in FIGS. 4 to 6, in the electrical / electronic device storage boxes of Examples 1 to 3, the relative humidity in the box was kept relatively low compared to the outside air, and the change in relative humidity was small. . On the other hand, as shown in FIG. 7, in the electric / electronic device storage box of Comparative Example 1, the moisture permeability of the electric / electronic device storage box body was large, and a large amount of external moisture flowed into the box. For this reason, the relative humidity in the box was relatively high, and the relative humidity sometimes reached 100%.

(Examples 4-8 and Comparative Examples 2-4)
Except for changing the volume and moisture permeability of the electrical / electronic device storage box body and the moisture absorption rate coefficient and moisture absorption capacity of the humidity control plate as shown in Table 2 below, the same as in Example 1, An electrical / electronic device storage box was obtained.

  About the obtained electrical / electronic apparatus storage box of Examples 4-8 and Comparative Examples 2-4, it carried out similarly to Examples 1-3 and Comparative Example 1, and evaluated the presence or absence of said (4) dew condensation.

  The results are shown in Table 2 below.

From the evaluation results of Examples 1 to 8, the moisture permeability of the electric / electronic device storage box body is in the range of 150 to 4,000 mg / (h · hPa · m ³ ), and the moisture absorption rate of the humidity control plate is as follows. The coefficient is in the range of 0.065 to 0.09 (1 / h), the moisture absorption capacity of the humidity control plate is in the range of 500 to 830, and the moisture permeability X, the volume V, and When the relationship with the surface area Y satisfies the above formula (1), it can be seen that no condensation occurs.

DESCRIPTION OF SYMBOLS 1 ... Electric / electronic device storage box 2 ... Electric / electronic device storage box body 2a ... Box 2b ... Door 2c ... Inner surface 3 ... Humidity control plate 3a ... First main surface 3b ... Second main surface 11 ... Electric / electronic Equipment 12 ... Hinge member 21 ... Bolt 22 ... Magnet 23 ... Washer 24 ... Nut 31 ... Humidity control plate 32 ... Mounting parts 33, 34 ... Pinch plate 35 ... Magnet 36 ... Biasing member

Claims (2)

An electrical / electronic device storage box body having a moisture permeability of 150 to 4,000 mg / (h · hPa · m ³ );
A humidity control plate disposed in the electric / electronic device storage box body, having a moisture absorption rate coefficient of 0.065 to 0.09 (1 / h) and a moisture absorption capacity of 500 to 830 g / m ² ;
The moisture permeability (mg / (h · hPa · m ³ )) of the electrical / electronic device storage box body is X, the volume (m ³ ) of the electrical / electronic device storage box body is V, and An electrical / electronic device storage box that satisfies the following formula (1), where Y is the surface area (m ² ) of one surface of the humidity control plate.
Y ≧ (1.5 × 10 ⁻⁴ X + 0.22) V / 0.7 Formula (1) Using an electrical / electronic device storage box body having a moisture permeability of 150 to 4,000 mg / (h · hPa · m ³ ),
Using a humidity control plate having a moisture absorption rate coefficient of 0.065 to 0.09 (1 / h) and a moisture absorption capacity of 500 to 830 g / m ² ,
The moisture permeability (mg / (h · hPa · m ³ )) of the electrical / electronic device storage box body is X, the volume (m ³ ) of the electrical / electronic device storage box body is V, and An electrical / electronic device in which the humidity control plate is disposed in the electric / electronic device storage box body so that the following formula (1) is satisfied when the surface area (m ² ) of one surface of the humidity control plate is Y: Storage box manufacturing method.
Y ≧ (1.5 × 10 ⁻⁴ X + 0.22) V / 0.7 Formula (1)

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