JP2002355514A - Respiration filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a respiration filter which stably can take out the air from which dust, humidity and corrosive components, etc., which are contained in the air can be removed for a long period although the filter is small-sized. SOLUTION: A porous body 3 comprising adsorbent which seizes humidity and corrosive components in air is incorporated in a frame body 2 having an air introducing port 4 and an air discharging port 5, a groove as an air passage 6 which connects the air introducing port 4 to the air discharging port 5 is formed in the porous body 3, porous films 7, 8 which blocks the invasion of the dust in air are disposed on the air introducing port 4 and the air discharging port 5 of the frame body 2 and, in such a manner, this respiration filter is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a respiratory filter for adjusting a pressure difference between the inside and the outside, and furthermore, it is possible to prevent dust contained in the air from entering, as well as moisture and hydrogen sulfide contained in the air. The present invention relates to a respiratory filter capable of removing corrosive components such as SOx, NOx, siloxane and the like and controlling the flow rate of air, and is suitable as a respiratory filter for a recording device such as a magnetic disk device. Things.

[0002]

2. Description of the Related Art Conventionally, a respiratory filter has been used as a means for adjusting the pressure difference between inside and outside, and is used, for example, in a magnetic disk device or a magneto-optical disk device as a recording device of a large computer or a personal computer. .

FIG. 4 is a schematic sectional view of a general magnetic disk drive. As shown in FIG.
2, a plurality of magnetic disk substrates 34 are attached with a space therebetween, and the magnetic head 35 flies above the magnetic disk substrate 34 by the rotation of the magnetic disk substrate 34. Then, by moving the magnetic head 35 to a predetermined position on the magnetic disk substrate 34,
The information on the magnetic disk substrate 34 is read and the information is written.

[0004] The magnetic disk drive 3 is provided in the casing 31 by rotation of the magnetic disk substrate 34 and temperature change.
In order to prevent a pressure difference between the inside and outside, a minute through hole 36 necessary for the air to enter and exit from the outside is formed.
Was installed in the casing 31.

The magnetic disk drive 30
The breathing filter 40 used not only adjusts the pressure difference between the inside and outside, but also includes dust, moisture,
It has been required to prevent the entry of corrosive components and the like and to suppress the flow rate of the entering air.

That is, if dust in the air enters between the magnetic head 35 and the magnetic disk substrate 34, it may cause a head crash.
Corrosive components in the air (eg, hydrogen sulfide, nitrogen oxidizing gas,
When acid gas, etc.) or moisture enters, the magnetic disk drive 3
This is because, if the components inside 0 are corroded and the corroded powder enters between the magnetic head 35 and the magnetic disk substrate 34, it will cause a head crash.

[0007] Therefore, the following has been proposed as a respiratory filter 40 for solving such a problem.

US Pat. No. 4,863,499 discloses an adsorbent for adsorbing and removing humidity and corrosive components in air in a concave portion of a resin case 41 as shown in FIGS. 5 (a) and 5 (b). Activated carbon tablet 42 is provided inside, and the opening of the concave portion is covered with a porous film 43 made of non-woven fabric. An air inlet 44 is provided on the upper surface of the resin case 41 opposite to the bottom surface of the concave portion. A respiratory filter 40 in which an air flow path 45 communicating with the air inlet 44 from the air inlet 44 to the bottom of the concave portion is provided in the thick portion 41 is disclosed. The flow rate of the entering outside air is suppressed by the meandering air flow path 45, and the activated carbon tablet 42 absorbs and removes moisture and corrosive components contained in the air.
The dust contained in the air is collected at 3 and the porous membrane 4 is collected.
3 to take in a clear stream from which dust, moisture and corrosive components have been removed.

Further, Japanese Patent Publication No. 4-79079 discloses that
As shown in FIG. 6, a respiratory filter 50 formed integrally with a casing 31 of the magnetic disk drive 30 is disclosed. Specifically, a part of the casing 31 having an air inlet 51 is partitioned. A partition plate 53 having an air outlet 52, and two partition plates 55 and 57 having communication ports 54 and 56 for further partitioning a space surrounded by the partition plate 53 and the casing 31 into three rooms. A respiratory filter 50 is disclosed in which each room is filled with a particulate adsorbent 58 for adsorbing and removing humidity in the air, and a porous film 59 is provided at the air outlet 52. According to the filter 50, the outside air entering from the air inlet 51 absorbs and removes the moisture contained in the air by the particulate adsorbent 58 in each room, and removes the gap between the particulate adsorbents 58. Pass while receiving resistance Suppressing the flow rate by the porous film 5
At 9, dust contained in the air is collected and the porous membrane 5 is collected.
9 to take in a clear stream from which dust and moisture had been removed.

[0010]

However, the respiratory filter 4 disclosed in U.S. Pat. No. 4,863,499 is disclosed.
Reference numeral 0 denotes a portion for suppressing the flow rate of air and a portion for absorbing and removing moisture and corrosive components in the air, which are formed independently of each other. Since it is formed in the thick portion, the thickness of the thick portion cannot be reduced due to problems in manufacturing and strength, and as a result, there is a problem that it is difficult to reduce the size.

That is, in order to form the air passage 45 in the thick part of the resin case 41, at least three resin plates are prepared, the air passage 45 is formed in the second resin plate, and the upper surface thereof is formed. It is formed by bonding a first resin plate having an air inlet and bonding a third resin plate having a concave portion on the lower surface. It is difficult to reduce the height of the respiratory filter 40 to 4 mm or less when the thickness is added.

For this reason, it is difficult to mount the magnetic disk drive 30 on which miniaturization is required, and a relatively large magnetic disk drive 30 occupies a considerably large area in the casing 31. There is an inconvenience that the mounting of parts is subject to design restrictions.

On the other hand, the respiratory filter 50 disclosed in Japanese Patent Publication No. 4-79079 does not have a large air flow path, so that the communication ports 54 and 56 are used to suppress the air flow rate and increase the moisture absorption efficiency. It is necessary to prepare a plurality of rooms partitioned by the partition plates 55 and 57 having the above-mentioned problem, and there is a problem that it is difficult to reduce the size.

For this reason, it is difficult to mount the respiratory filter 50 disclosed in Japanese Patent Publication No. 4-79079 on the magnetic disk device 30 which is required to be downsized. Also occupies a considerably large area in the casing 31, and there is an inconvenience that design restrictions are imposed when other components are mounted.

Moreover, the activated carbon or the like as the adsorbent 58 is relatively brittle, and the structure in which the spherical adsorbent 58 is filled in the room as in the respiratory filter 50 disclosed in Japanese Patent Publication No. 4-79079 will cause vibration. When a large impact is applied, the spherical adsorbents 58 collide with each other and rub against each other.
However, there was also a problem that the desired performance could not be exhibited.

Also, a respiratory filter 40 and Japanese Patent Publication No. 4-790 disclosed in US Pat. No. 4,863,499 are disclosed.
The respiratory filter 50 disclosed in Japanese Patent Publication No. 79 has only the porous membranes 43 and 59 only at the air outlets, but not at the air inlets 44 and 51. If the dust in the air is clogged between the air flow path 45 and the particulate adsorbent 58, the flow of air is hindered and the efficiency of absorbing moisture in the air and the efficiency of absorbing corrosive components are reduced. There was also.

When such a problem occurs in the respiratory filters 40 and 50 used in the magnetic disk device 30, the components constituting the magnetic disk device 30 are rusted or corroded by moisture or corrosive components, and generate particles. Therefore, if the particles get caught between the magnetic disk substrate 34 and the magnetic head 35, the magnetic film on the magnetic head 35 and the magnetic disk substrate 34 will be damaged, and it will be impossible to record or read information. there were.

[0018]

SUMMARY OF THE INVENTION An object of the present invention is to provide a respiratory filter which is extremely small in size and capable of adsorbing and removing moisture and corrosive components contained in air for a long period of time.

[0019]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a porous body made of an adsorbent for collecting moisture and corrosive components in air in a frame having an air inlet and an air outlet. The porous body has a groove formed therein as an air flow path connecting the air inlet and the air outlet, and the air inlet and the air outlet of the frame are provided with dust in the air. A respiratory filter is provided by providing a porous membrane for preventing the ingress of air.

Further, the present invention comprises a frame having an air inlet and an air outlet, in which two or more porous bodies made of an adsorbent for collecting moisture and corrosive components in the air are laminated and built. A groove is formed in the porous body at least on the air inlet side as an air flow path connecting the air inlet and another porous body, and air is formed in the air inlet and air outlet of the frame. A respiratory filter is provided by providing a porous film for removing dust therein.

[0021] As the adsorbent for forming the porous body, an average pore diameter of 7.3A～9.6A, and a specific surface area using activated carbon in the range of 1430m ² / g~2250m ² / g Preferably, the filling rate of the activated carbon in the frame is 0.2 g / cc to 0.4 g / cc.
It is preferable that

In the present invention, the term "filling ratio of activated carbon in the frame" means the weight of activated carbon per unit volume, and "the filling ratio is 0.2 g / cc to 0.4 g / c.
"c" means 0.2 g to 0.4 g per cc of volume.
Say that the activated carbon is filled.

[0023]

Embodiments of the present invention will be described below.

FIG. 1A is a plan view showing a respiratory filter according to the present invention, and FIG. 1B is a sectional view showing a respiratory filter according to the present invention.

This respiratory filter 1 has a rectangular parallelepiped frame 2 in which a porous body 3 made of an adsorbent for trapping moisture and corrosive components in the air is incorporated. The main surface (the widest surface) has an air inlet 4 for taking in outside air, and the other main surface (the widest surface) of the frame 2.
Has an air outlet 5 for taking out air from which moisture and corrosive components contained in the outside air have been removed.

The porous body 3 incorporated in the frame 2 is formed by solidifying a granular or fibrous adsorbent with an organic binder, and has a gap between the adsorbents. Acts as a vent that communicates with the other surface. Therefore, when a granular adsorbent is used, the size of the gap between the adsorbents can be made uniform by controlling the particle size distribution, and the air flow rate can be controlled.

For example, the pressure loss of the entire respiratory filter 1 is 10 to 500 mm when the air flow rate is 200 cc / min.
When it is necessary to control to be H ₂ O, the average pore diameter of the porous body 3 is 10 to 300 μm, and the porosity is 3
It may be adjusted in the range of 0 to 90%. If a further lower pressure loss is required, the average pore diameter and / or porosity of the porous body 3 may be increased.
It may be adjusted within a range where the air diffusion rate in the chamber is not too fast and the moisture absorption performance of moisture and the adsorption performance of corrosive components are not excessively reduced.

As described above, as the adsorbent,
Any material can be used as long as it can adsorb moisture and corrosive components in the air. For example, activated carbon, zeolite, various clays, and ion exchange resins can be used. When activated carbon is used as the adsorbent, an appropriate amount of silica gel may be mixed to assist the function of absorbing and desorbing moisture.

When activated carbon is used as the adsorbent,
The average pore diameter is 7.3 to 9.6, and the specific surface area is 1
It is preferable to use activated carbon in the range of 430m ² / g~2250m ² / g.

This is because activated carbon has an average pore diameter of 7.3 mm.
If the diameter is smaller, the pores formed in the activated carbon are too small to adsorb a gas having a large molecule. Conversely, the average pore diameter of the activated carbon is 9.6.
If the size is larger than Å, a production process called activation for expanding the pore diameter of the activated carbon must be repeated, which not only complicates the production process but also leads to instability in quality and cost increase.

The activated carbon has a specific surface area of 1430 m ² /
If the specific surface area of the activated carbon is less than 2 g, it is not possible to obtain a sufficient adsorption performance because the adsorption area is small.
If it is greater than 250 m ² / g, the activation must be repeated, which complicates the production process, stabilizes the quality, and leads to an increase in cost.

Furthermore, when the adsorbent for forming the porous body 3 is activated carbon, the pressure loss during air flow rate 200 cc / min to the 10H ₂ O~500mmH ₂ O is the frame 2
0.2g / cc-0.4g of activated carbon filling rate
/ Cc is preferable.

This is because the filling rate of activated carbon is 0.2 g / cc.
If it is smaller, the amount of activated carbon in the frame 2 is small, so that sufficient moisture and gas adsorption performance cannot be obtained. Conversely, if the filling rate of activated carbon exceeds 0.4 g / cc,
This is because a sufficient pressure of air cannot be obtained because the pressure loss increases.

The average pore size and specific surface area of the activated carbon are N
₂ It can be measured by using a pore distribution measuring device using (nitrogen).

The porous body 3 is formed with a groove as an air flow path 6 communicating from the air inlet 4 to the air outlet 5 and has a sectional shape as shown in FIG. As shown in FIG. 1 (a), the surface of the porous body 3 on the side of the air inlet 4 is made to meander from one end to the other end in the form of a pulse wave. A hole penetrating the body 3 communicates with an air outlet 5 opened on the surface of the frame 2 opposite to the air inlet 4.

The air passage 6 controls the flow rate of air in the respiratory filter 1, diffuses the air throughout the porous body 3, and improves the moisture absorption performance of moisture contained in the air and the adsorption performance of corrosive components. The area of the groove cross-section and the length of the groove forming the air passage 6 may be appropriately set according to the pressure loss required for the respiratory filter 1. For example, when the air flow rate is 200 cc / min. , 10~500mmH ₂ O
In order to control so that
5 mm ² and the total length of the groove may be adjusted in the range of 5 to 100 mm.

The shape and pattern of the cross section of the groove forming the air passage 6 are not limited to those shown in FIGS. 1 (a) and 1 (b). , U-shaped, and V-shaped can be used, and various pattern shapes such as a smooth waveform can be adopted as the groove pattern shape. However, in order to reduce the amount of the porous membrane used, it is preferable that the area of the groove cross section is equal to or slightly smaller than the air inlet 4 and the air outlet 5.

The air inlet 4 and the air outlet 5 of the frame 2 are made of polyester having a mesh size of about 0.1 to 1 μm.
Porous membranes 7 and 8 having a thickness of about several hundred μm made of a resin-based non-woven fabric such as polypropylene and polyethylene are provided.
The porous film 7 on the side of the air inlet 4 prevents dust contained in the air from entering, and the porous film 8 on the side of the air outlet 5 can be removed by the porous film 7 on the side of the air inlet 4. The dust which has not been removed is removed, and the dust generated in the respiratory filter is removed.

Next, the function of the respiratory filter 1 of the present invention will be described.

First, the respiratory filter 1 of the present invention is installed such that the air inlet 4 is open to the atmosphere and the air outlet 5 is opened to another space. When the pressure becomes lower than the atmospheric pressure, air in the atmosphere is guided into the respiratory filter 1 from the air inlet. However, since the porous film 7 is formed in the air inlet 4, The relatively large dust contained therein can be prevented from entering by the porous film 7. Therefore, FIGS. 5 and 6
As shown in the conventional respiratory filters 40 and 50, the gap between the adsorbents is closed by the dust in the air, and the ventilation performance is deteriorated. Deterioration can be prevented.

Then, the air that has passed through the porous membrane 7 passes through the air flow path 6 formed in the porous body 3 and passes through the air outlet 5
However, since the air flows meanderingly, the flow velocity is suppressed, and a part of the air flows to the air outlet through the vent hole opened in the air flow path 6. At this time, moisture and corrosive components contained in the air passing through the air passage 6 are adsorbed and removed by contact with the adsorbent forming the surface of the air passage 6, and the inside of the porous body 3 is removed. Moisture and corrosive components contained in the air passing through are adsorbed and removed by contact with the adsorbent forming the vent surface.

When the air flowing through the air flow path 6 and the porous body 3 passes through the porous film 8 provided in the air discharge port 5, dust is further removed. In addition, air containing almost no corrosive components can be taken in.

As described above, according to the respiratory filter 1 of the present invention, the porous body 3 is formed using the adsorbent for removing moisture and corrosive components in the air, and the flow rate of the air is controlled on the surface thereof. Since the air flow path 6 is provided, the air taken in from the air inlet 4 can be sent to the entire porous body 3, and moisture and corrosive components in the air can be efficiently removed. The volume of the body 3 can be significantly reduced as compared with the conventional respiratory filters 40 and 50,
As a result, the respiratory filter 1
The overall size can be made extremely compact.

Next, a method for manufacturing the respiratory filter 1 of the present invention will be described.

First, in order to manufacture the porous body 3 for adsorbing moisture and corrosive components in the air, an adsorbent made of granular or fibrous activated carbon, zeolite, various clays, ion exchange resins, etc. is prepared. Then, an organic binder composed of polyethylene glycol, polyvinyl alcohol, acrylic acid ester and the like is added to the mixture and mixed so as to be mixed uniformly.

In order to uniformly mix the adsorbent and the organic binder, a mixing stirrer such as a universal stirrer is used for 100-500.
What is necessary is just to mix at a rotation speed of about rpm.

In addition, when the organic binder is added in a liquid state, the gap between the adsorbents is closed, and the moisture absorption performance and the adsorption performance may be impaired as well as the air permeability. It is also possible to use a porous resin powder impregnated with a liquid organic binder. In addition, silica gel may be added as needed.

Next, the uniformly mixed raw material is formed into a predetermined shape by extrusion molding, press molding or the like, and then heat treatment is applied to bring the organic binder into close contact with the adsorbent, so that the space formed between the adsorbents is one side. After forming the porous body 3 having a three-dimensional network structure having ventilation holes communicating from the surface of the porous body to the other surface, a meandering groove serving as the air flow path 6 is formed on the surface of the porous body 3 by grinding. Engrave. In the case of press molding, a meandering groove serving as the air flow path 6 may be formed integrally with the molded body.

At this time, for example, the pressure loss of the entire respiratory filter 1 is 10 to 500 at an air flow rate of 200 cc / min.
If it is necessary to control so that mmH ₂ O, an average pore diameter of the porous body 3 10 to 300 [mu] m, a porosity of 30
To 90%, and the area of the groove cross section as the air flow path 6 formed in the porous body 3 is set to 0.05 to 5 mm ² ,
If the total length of the groove is 5 to 100 mm, a respirable filter 1 that can be used even if the thickness of the porous body 3 is reduced to 3 mm or less can be manufactured.

When activated carbon is used as the adsorbent,
Coarse-grain activated carbon, activated carbon beads, and activated carbon fiber are used, and if necessary, these are mixed so that the filling rate of activated carbon in the frame 2 is 0.2 g / cc to 0.4 g / cc.
g / cc.

Next, the frame 2 surrounding the porous body 3 is formed.
It is only necessary that the structure does not allow air taken in from the outside to leak out, and resin sheets and polymer films with poor air permeability,
Alternatively, it is formed using an adhesive.

For example, when a resin sheet is used, an upper plate having an air inlet 4 and an air outlet 5
A resin sheet serving as a lower plate, two resin sheets serving as side plates, and two resin sheets serving as end plates are prepared, and these resin sheets are molded using an adhesive or a double-sided adhesive tape. After surrounding the molded body, the bonding surface side of the resin sheet is melted by thermocompression bonding or ultrasonic welding, soaked into the communication holes on the surface of the porous body 3 and cured, thereby anchoring effect. The frame 2 surrounding the porous body 3 can be formed by bringing the resin sheets into close contact with each other and also by bringing the resin sheets into close contact with each other. When a resin sheet is used, a material having poor air permeability is preferably used, and for example, polyethylene, polypropylene, polyester, polyethylene phthalate, or polycarbonate can be used.

When a polymer film and an adhesive are used, a polymer film serving as an upper plate having an air inlet 4 and a polymer film serving as a lower plate having an air outlet 5 are prepared. The surface of the body 3 on which the air flow path 6 is formed and the back side thereof are bonded using a thermosetting adhesive or a double-sided adhesive tape, respectively. By applying an agent and curing by applying heat, the side and end surfaces of the porous body 3 are hermetically sealed by the adhesive layer, and the upper and lower surfaces of the porous body 3 are hermetically sealed by the polymer film. Frame 2 can be formed.

When the air inlet 4 and the air outlet 5 are formed, the air taken in from the air inlet 4 is spread on the whole of the porous body 3 as much as possible so that the air taken in from the air inlet 4 is spread on both sides of the porous body 3. In addition to forming the frame 2, the distance is preferably as long as possible from the viewpoint of suppressing the flow velocity of the air taken in from the air inlet 4, and is preferably equal to or greater than the distance between the upper and lower plates forming the frame 2.

Thereafter, a resin nonwoven fabric for forming the porous films 7 and 8 is placed on the air inlet 4 and the air outlet 5 of the frame 2 and joined by thermocompression bonding or ultrasonic welding. The respiratory filter 1 can be manufactured.

FIG. 1 shows an example in which the air inlet 4 and the air outlet 5 formed in the frame 2 are formed on the upper and lower plates of the frame 2. The plate may be replaced with a porous membrane, and the entire porous membrane may be used as the air inlet 4 and / or the air outlet 5.

Further, the outer shape of the respiratory filter 1 is not particularly limited, and various shapes such as a rectangular parallelepiped, a regular tetrahedron, an elliptic cylinder, a circular cylinder, a triangular prism, or other column-shaped bodies may be adopted in accordance with the space of the installation location. Can be.

As described above, the respiratory filter 1 of the present invention is not limited to the above-described embodiment, but
It goes without saying that improvements and modifications may be made without departing from the spirit of the present invention.

Next, an example in which the respiratory filter 1 of the present invention is used in a magnetic disk device 30 will be described.

FIG. 2 is a schematic cross-sectional view of a magnetic disk drive 30 provided with the respiratory filter 1 of the present invention. As shown in FIG. The magnetic head 35 flies above the magnetic disk substrate 34 by the rotation of the magnetic disk substrate 34. By moving the magnetic head 35 to a predetermined position on the magnetic disk substrate 34, information on the magnetic disk substrate 34 is read or information is written.

In the figure, on the left side of the casing 31,
Pressure loss is 500mm when air flow rate is 200cc / min
A respiratory filter 1 of the present invention shown in FIG. 1 which can be H ₂ O or less is installed, and a through-hole 36 provided in an upper portion of a casing 31 is made to coincide with an air inlet 4 of the respiratory filter 1.

Therefore, when the pressure in the magnetic disk device 30 becomes lower than the outside air due to the change of the outside air temperature or the rotation of the magnetic disk substrate 34, a pressure difference is generated and the outside air is taken in from the air inlet 4. Dust in the outside air is removed by the porous membrane 7 provided in the air inlet 4, and the flow rate of the air taken into the respiratory filter 1 is suppressed by the air flow path 6. After flowing into the body 3 and coming into contact with many adsorbents, the air outlet 5
Is taken into the magnetic disk device 30 through the porous film 8 on the side of the magnetic disk device 30. Since the air taken into the magnetic disk device 30 contains almost no moisture or corrosive components, Since the components of the respiratory filter 1 of the present invention can be stably driven even during long-term use without rusting or corroding the components, the respiratory filter 1 of the present invention requires an extremely small area. It can respond to various design needs and can be used for a thin magnetic disk device 30 used for a notebook personal computer.

Next, another embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS.

In this respiratory filter 10, the porous membrane 8 provided on the air outlet 5 of the respiratory filter 1 shown in FIG. 1 is removed, and porous bodies 11 and 12 made of a plurality of adsorbents are further provided on the air outlet 5 side. They are arranged in a stack to enhance the effect of absorbing moisture in air and the effect of adsorbing corrosive components.

In the respiratory filter 10 shown in FIG. 3, a second porous body 11 made of an adsorbent having no air flow path is arranged on the side of the air outlet 5, and a communication port 13 is further provided.
A third porous body 12 made of an adsorbent that does not form an air flow path is disposed with a resin sheet provided with the porous sheet therebetween, and a porous film 14 is disposed on the lowermost layer thereof. Body 1
The side surfaces and end surfaces of the first and third porous bodies 12 are surrounded by a resin sheet as the frame 2 extending from the first porous body 3 side, and the second porous body 11 and the third porous body The communication port 13 provided in the resin sheet disposed between the first porous body 3 and the porous body 12 is disposed at a position farthest from the air discharge port 5. , The second porous body 11, and the third porous body 12, respectively.

Therefore, according to the respiratory filter 10,
The dehumidifying effect and the adsorbing effect of the corrosive component can be obtained about three times as large as those of the respiratory filter 1 of FIG. Moreover, since the thickness of one layer of the porous body 3, 11, 12 can be extremely reduced, the respiratory filter 1 can achieve a three-fold dehumidifying effect and an effect of adsorbing corrosive components while being small.

In FIG. 3, three layers of porous bodies 3, 11, and
Although the respiratory filter 10 including 12 is shown, the number of layers of the porous bodies 3, 11, and 12 may be appropriately selected according to the required dehumidifying performance and adsorption performance of the corrosive component.

[0068]

(Embodiment 1) Here, a respiratory filter 10 of the present invention shown in FIG. 3 and a conventional respiratory filter 40 shown in FIG. 5 are prepared and mounted in a 2.5-inch magnetic disk drive 30 to absorb moisture. Experiments were performed to compare performance.

In the experiment, the respiratory filter 10 of the present invention was used.
Uses granular activated carbon as an adsorbent for forming the porous bodies 3, 11, 12 so that the porosity when the porous bodies 3, 11, 12 are formed is 40%, and the average pore diameter is 60 μm. The outer shape of the first porous body 3 is formed by laminating three layers each having a plate shape of 10 mm × 10 mm × 0.4 mm, and a square having a side of about 150 μm as a cross-sectional shape is formed on the surface of the first porous body 3. The air channel 6 was formed by bending the groove thus formed in a pulse wave manner as shown in FIG.

A polyethylene phthalate film having a thickness of about 100 μm is used for a side plate and an end plate of the frame 2 surrounding the porous bodies 3, 11, and 12. A polyethylene phthalate film of about 50 μm is used, and the porous membranes 7 and 14 forming the air inlet 4 and the air outlet have a thickness of 100 μm.
A nonwoven fabric made of polyethylene having an aperture of 1 μm was used, and these were bonded to the surfaces of the porous bodies 3, 11, and 12 by thermocompression bonding to form a breath filter 10 of the present invention.

Then, the obtained respiratory filter 1 of the present invention is obtained.
When a pressure loss of 0 was examined, the air flow rate was 3 m / min.
At this time, it was about 150 mmH ₂ O or less, and the thickness of the entire respiratory filter 10 was examined, and it was about 1.5 mm.

On the other hand, the conventional respiratory filter 40 has a diameter of 1
A granular activated carbon tablet 42 having a diameter of 8 mm and a height of 2.5 mm is inserted into a concave portion of a columnar polycarbonate resin case having a thickness of 0 mm and a height of 4 mm.
What was covered with a nonwoven fabric made of polyethylene having a size of 0 μm and a mesh size of 40 μm was used. The cross-sectional area of the air passage 45 formed in the resin case 41 was about 0.2 mm ² , and the distance of the air passage 45 was about 20 mm.

Then, the obtained conventional respiratory filter 40 is obtained.
When the pressure loss was measured, the air flow rate was 3 m / min.
At this time, the thickness was about 150 mmH ₂ O or less, and the thickness of the entire respiratory filter 40 was 4 mm when examined.

As a result, when the respiratory filter 10 of the present invention and the conventional respiratory filter 40 are compared, although they have almost the same performance, the respiratory filter 10 of the present invention has a volume less than half that of the conventional respiratory filter 40. It is possible,
It can be seen that the size can be extremely reduced.

Next, two magnetic disk drives 30 having a casing 31 having a thickness of 4 mm and the same volume are prepared. The respiratory filter 10 of the present invention is in a state as shown in FIG. After installation in the state as shown in FIG. 4, the temperature and humidity in each magnetic disk device 30 were stabilized at the same temperature of 20 ° C. and 40% of humidity as the outside air. Thereafter, the temperature of the outside air is set to 20 ° C. and the humidity is set to 80%.
The amount of internal humidity rise was measured with a temperature / humidity measuring device.

The results are as shown in Table 1.

[0077]

[Table 1]

As can be seen from the results, the respiratory filter 10 of the present invention has the same moisture absorption performance even though the whole volume is less than half of the conventional respiratory filter 40, and meets various design requirements. It turns out that it is a respiratory filter which can respond to it. (Embodiment 2) Therefore, in the respiratory filter 10 of the present invention having the structure shown in FIG. 3, the adsorbent forming the porous bodies 3, 11, and 12 is made of fibrous activated carbon having different average pore diameters and specific surface areas. And a respiration filter 10 similar to that of Example 1 was manufactured except that the filling rate of activated carbon in the frame 2 was set to 0.3 g / cc.

Then, these respiratory filters 10 are shown in FIG.
After installation in the state shown in FIG.
The inside temperature and humidity were stabilized at the same temperature as outside air, 20 ° C., and humidity, 40%. Thereafter, the temperature of the outside air was set to 20 ° C. and the humidity was set to 80%.
The amount of increase in humidity inside 0 was measured by a temperature / humidity measuring device.

The results are as shown in Table 2.

[0081]

[Table 2]

As can be seen from Table 2, the average pore diameter of the adsorbent is 7.3 to 9.6 and the specific surface area is 143.
The use of activated carbon in the range of 0m ² / g~2250m ² / g, it was possible to suppress an increase in humidity humidity increase of the magnetic disk device 30 in a conventional breathing filter equal to or higher.

As a result, when activated carbon is used as the adsorbent,
The average pore diameter is 7.3 to 9.6, and the specific surface area is 1
430m ² / g~2250m activated carbon it is understood that it is better to use in the range of ² / g. (Embodiment 3) Next, in the respiratory filter 10 of the present invention having the structure shown in FIG. 3, the adsorbent forming the porous bodies 3, 11, 12 has an average pore diameter of 7.3 to 9.6 mm. and a specific surface area of 1430m ² / g~2250m ² / g using active carbon in the range of, breathing filter 10 for repeated except varying the filling factor of the activated carbon of example 1 in the frame 2
Was made.

Then, these respiratory filters 10 are shown in FIG.
After installation in the state shown in FIG.
The inside temperature and humidity were stabilized at the same temperature as outside air, 20 ° C., and humidity, 40%. Thereafter, the temperature of the outside air was set to 20 ° C. and the humidity was set to 80%.
The amount of increase in humidity inside 0 was measured by a temperature / humidity measuring device. Further, the pressure loss when air at a flow rate of 200 cc / min was supplied to each respiratory filter 10 was measured with a commercially available Manostar gauge.

The results are as shown in Table 3.

[0086]

[Table 3]

[0087] As can be seen from Table 3, the activated carbon with an average pore diameter of the adsorbent to form a porous body 7.3A～9.6A, and a specific surface area in the range of 1430m ² / g~2250m ² / g When the filling rate of the activated carbon in the porous body is set to 0.2 g / cc to 0.4 g / cc, the amount of increase in humidity in the magnetic disk device 30 can be suppressed as compared with the conventional respiratory filter, Air flow rate 200cc / mi
n to be a pressure loss 500mmH ₂ O or less, were excellent.

[0088]

As described above, according to the present invention, a porous body made of an adsorbent for collecting moisture and corrosive components in the air is built in a frame having an air inlet and an air outlet. And
A groove is formed in the porous body as an air flow path connecting the air inlet and the air outlet, and entry of dust in the air into the air inlet and the air outlet of the frame body is prevented. Since the respiratory filter is formed by providing the porous membrane, it is possible to stably take out the air from which dust, moisture, corrosive components and the like contained in the air have been removed while being small in size.

Further, according to the present invention, in a frame having an air inlet and an air outlet, two or more porous bodies made of an adsorbent for collecting moisture and corrosive components in the air are laminated and built in. A groove is formed in the porous body at least on the air inlet side as an air flow path connecting the air inlet and another porous body, and air is formed in the air inlet and air outlet of the frame. A breathable filter with a porous membrane that removes dust from the inside makes the air that is small but free of dust, moisture, corrosive components, etc. from the air more stable over a long period of time. Can be taken out.

Further, when activated carbon is used as the adsorbent forming the porous body, the average pore size of the activated carbon is from 7.3 to 9.5.
6 ° and a specific surface area of 1430 m ² / g to 2250 m ²
/ G, the ability to adsorb moisture and corrosive components can be increased, and the activated carbon can be used to increase the filling rate of the activated carbon in the frame from 0.2 g / cc to 0.4 g / cc.
By doing so, it is possible to provide a respiratory filter having a small pressure loss.

[Brief description of the drawings]

FIG. 1A is a plan view showing a respiratory filter according to the present invention, and FIG. 1B is a cross-sectional view showing a respiratory filter according to the present invention.

FIG. 2 is a schematic sectional view showing a magnetic disk drive provided with the respiratory filter of the present invention.

3A is a plan view showing another embodiment of the respiratory filter according to the present invention, and FIG. 3B is a cross-sectional view showing another embodiment of the respiratory filter according to the present invention.

FIG. 4 is a schematic sectional view showing a general magnetic disk drive.

FIG. 5A is a plan view showing a conventional respiratory filter,
(B) is a sectional view showing a conventional respiratory filter.

FIG. 6 is a schematic sectional view showing a magnetic disk drive provided with another conventional respiratory filter.

[Explanation of symbols]

 1,10: Respiratory filter 2: Frame 3, 11, 12: Porous body 4: Air inlet 5: Air outlet 6: Air flow path 7, 8, 14: Porous membrane 13: Vent 30: Magnetic Disk device 31: Casing 32: Rotating shaft 34: Magnetic disk substrate 35: Magnetic head 40: Respiratory filter 41: Resin case 42: Activated carbon tablet 43: Porous film 44: Air inlet 45: Air flow path 50: Respiratory filter 51 : Air inlet 52: air outlet 53, 55, 57: partition plate 54, 56: communication port 58: granular adsorbent 59: porous membrane

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G11B 33/14 501 G11B 33/14 501Q // B01D 71/26 B01D 71/26 71/48 71/48 (72) Invention Person Akihiko Takahashi 1810 Takagicho, Kawauchi-shi, Kagoshima Prefecture F-term in Kyocera Corporation's Kagoshima-Sendai plant F-term (reference) 4D006 GA41 GA44 KB12 KD09 KD19 MA22 MA31 MC22 MC23 MC48 PB17 PB70 PC80 4D012 CA01 CA10 CB08 CE03 CF10 CG02 ACH04 CH08 BA13 BB03 BB07 BB08 BB10 BC05 BD01 BD03 BD06 CB01 CB04 4D052 AA00 AA10 CE00 GA04 GB12 GB14 HA21 HB02

Claims (4)

[Claims] 1. A porous body made of an adsorbent for collecting moisture and corrosive components in air is built in a frame having an air inlet and an air outlet. A groove is provided as an air flow path connecting the air inlet and the air outlet, and a porous film is provided at the air inlet and the air outlet of the frame to prevent dust from entering in the air. A respiratory filter characterized by the following. 2. A frame body having an air inlet and an air outlet, wherein a porous body made of an adsorbent for collecting moisture and corrosive components in the air is built in two or more layers, At least the porous body on the side of the air inlet has a groove as an air flow path connecting the air inlet and another porous body. A respiratory filter characterized by comprising a porous membrane for removing water. 3. The adsorbent forming the porous body has an average pore diameter of 7.3 to 9.6 and a specific surface area of 1,430 m ^2.
The respiratory filter according to claim 1, wherein the respiratory filter is activated carbon in a range of from ² g / g to 2250 m ² / g. 4. The method according to claim 1, wherein the filling rate of the activated carbon in the frame is 0.5.
The respiratory filter according to claim 3, wherein the respiratory filter is 2 g / cc to 0.4 g / cc.