JPH0414107Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a structure for installing a filter installed on an air blowing surface of a clean room.

[Conventional technology]

When creating a clean room, clean air is blown out through the surface of a HEPA filter (high performance filter) installed on the ceiling. In order to spread such a layer of HEPA filter over a relatively large area, it is usual to install a large number of filter units adjacent to each other, each housing a filter medium in a rectangular frame with upper and lower openings. For this installation, a frame is assembled in advance so that an opening corresponding to the size of each filter unit is formed, and each filter unit is installed in the opening of this frame. The frame consists of intersecting frames, usually made of metal.

[Problem that the invention attempts to solve]

When a filter unit is installed on a frame, if a gap is created between the two, air that does not pass through the filter will leak out, so a seal is required. Various types of sealing materials have been used in the past, but in order to achieve a perfect seal, adhesives are required, and adhesion makes it difficult to replace or repair the filter unit during maintenance, and the installation work is also complicated. There is a problem with becoming. When a removable gasket is used as a sealing material, conventional gaskets may be misaligned due to vibration or deformed over time, causing air leakage.
In order to avoid this, filling or applying a liquid or semi-liquid coating agent has been carried out, but this has the problem of making the work complicated.
There is also the problem of contaminating the inside of the clean room.

For example, Japanese Patent Application Laid-Open No. 58-36613 discloses a gasket in which sealing liquid is pre-filled in a groove with cuts, and proposes to perform a liquid-tight seal by letting the sealing liquid flow out from the cuts during installation. . However, when such a liquid seal is used, there is a risk that it may be washed away during removal and contaminate the clean room. Additionally, once removed, the sealing liquid must be re-injected, which is inconvenient.

Further, Japanese Patent Application Laid-Open No. 59-26119 discloses a rubber gasket in which approximately V-shaped folds are filled with a liquid sealant, and proposes maintaining airtightness with a liquid-tight structure using the liquid sealant. In this case as well, there is a problem of contaminating the clean room during replacement as described above, and great care must be taken in the work.

[Means to solve problems]

In order to solve such problems, this invention
The filter unit is installed on a frame using a gasket with a suction cup function, and as shown in the drawing, a filter unit 3 containing a filter medium 2 in a rectangular frame 1 with upper and lower openings is mounted on an endless rectangular bar. This is a filter installation structure that is attached to the frame member 4 via a gasket 5, which is made of It is in detachable contact with the frame member 4 or the filter unit 3, and the gasket surface on the side in detachable contact has an endless hollow 7 along the longitudinal direction of the bar, and is coated with non-evaporable mucus. This invention has devised a filter installation structure characterized by being configured with a suction cup surface.

〔Example〕

FIG. 1 shows the gasket insertion part in the filter installation structure of the present invention. When forming a relatively large filter area, such as when a HEPA filter is stretched across the ceiling of a clean room to form a clean air blowing surface, it is necessary to A large number of filter units 3 containing high-performance filter media 2 are installed adjacently on a frame member 4. The frame member 4 is made of a metal frame, and by assembling the frame in a crosswise manner, a large number of openings corresponding to the size of the filter unit 3 are formed in a grid pattern. Filter unit 3 on frame member 4
There are various ways to support the HEPA filter 2, but in the example shown in FIG. The figure shows a method of installing the frame on the frame member 4. Then, a special suction cup type gasket 5 according to the present invention is inserted between the flange portion 6 and the frame member 4.

FIG. 2 shows an example of the overall shape of the gasket 5 according to the present invention. The gasket 5 is made of a bar-shaped elastic material such as rubber and molded into a rectangular shape, and has suction cups formed on one of its upper and lower surfaces. This suction cup is formed by providing a hollow 7 on one side, as shown in the enlarged view of part A and the enlarged view of part B. This hollow 7 is a hollow sandwiched between sides 8 and 9 on both sides along the longitudinal direction of the bar,
Sides 8 and 9 have a thin wall thickness and are shaped to protrude. As shown in the enlarged view of part B, this hollow 7 is continuous even at the corner part, and therefore,
It is connected endlessly throughout the rectangular gasket. As a result, when the hollow 7 is pressed against the surface of the flat member, the volume of the hollow 7 is compressed, and the reduced pressure caused by the compression causes the sides 8 and 9 to be attracted to the surface of the flat member. In the present invention, the surface that functions as a suction cup is coated with or impregnated with a non-evaporable sealing material (for example, oily slime) and then used as a gasket for installing a filter. FIG. 1 shows an example in which the suction cup coated or impregnated with this non-evaporable sealing material is pressed against the back side of the flange portion 6 with the suction cup surface facing upward.
In this state, the flange portion 6 and gasket 5
is absorbed by a suction cup.

Note that this non-evaporable sealing material mucus is only applied or impregnated, and no excess amount that would run off is allowed to exist on this surface. is not retained like a liquid reservoir.

FIG. 3 shows the same installation structure as FIG. 1 except that the suction cup surface of the gasket 5 is placed on the side of the frame member 4. In addition, in this FIG.
Pass the nut 14 through the hole of the protrusion 13 fixed to the
Although an example of tightening is shown, such a tightening structure is not necessarily necessary.

4 and 5, a frame member 4 is positioned on the flange portion 6 extending from the lower edge of the rectangular frame 1 via a gasket 5 similar to the previous example, and the upper part of this frame member 4 is attached to the rectangular frame 1 with one end. It shows an installation structure in which it is pressed down by a fixed leaf spring 15. In this case, for example, as shown in FIG. 4, one of the filter units 3a and the frame member 4 are first fixed, and then the other filter unit 3b is pushed up from below until it reaches the state shown in FIG. It can be easily installed using a step-by-step installation method.

In this way, the present invention uses a bar-shaped gasket 5 with a suction cup (a gasket whose suction cup surface is coated with or impregnated with a non-evaporable sealant), and this is inserted between the frame member 4 and the rectangular frame 1. In order to achieve a perfect seal by interposing the gasket, it is preferable to adhere the surface of the gasket 5 opposite to the suction cup surface to the side of the frame member 4 or the square frame 1 in advance. For example, the first
In the figure, the gasket 5 is attached to the frame member 4, and in the examples shown in FIGS.
The surface opposite to the suction cup surface can be glued in advance.

[Effect]

According to the filter installation structure of the present invention, since a suction cup is used, it can be installed with one touch without using a gap filler or the like. This eliminates technical differences among workers, which is the case when using a gap filler, and improves work efficiency. Further, if a pressing force is applied by an attachment as shown in FIG. 3 and FIGS. 4 and 5, the force by the suction cup becomes permanent and a long-term seal is achieved. By using a non-evaporable sealant, the suction force of the suction cup can be maintained for a long period of time, and it can sufficiently withstand external forces such as vibrations. Therefore,
A clean room where air leakage is not allowed.
For installation and repair of HEPA filters, etc.
The present invention can exhibit great effects in terms of both sealability and workability. Furthermore, since the suction surface can be easily released from suction, it is easy to remove and does not contaminate the inside of the clean room, which is an advantage that the liquid-tight seal method does not have.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view of essential parts showing an example of a filter installation structure according to the invention, Fig. 2 is a perspective view showing the overall shape of a gasket according to the invention, and Fig. 3 is another example of a filter installation structure according to the invention. FIG. 4 is a schematic sectional view showing a state in the middle of installation in an installation structure example according to the present invention,
FIG. 5 is a schematic sectional view showing a state in which the installation is completed from the state in FIG. 4. DESCRIPTION OF SYMBOLS 1... Square frame, 2... Filter, 3... Filter unit, 4... Frame material, 5... Gasket with suction cup, 6... Flange portion of square frame, 15... Leaf spring.

Claims (1)

[Scope of utility model registration request] A filter installation structure in which a filter unit 3 in which a filter medium 2 is housed in a rectangular frame 1 with upper and lower openings is attached to a frame member 4 via a gasket 5 consisting of an endless rectangular bar, in which one side of the gasket 5 is hermetically bonded to either the filter unit 3 or the frame member 4, the other surface of the gasket 5 is in detachable contact with the frame member 4 or the filter unit 3, and the gasket surface on the side that is in detachable contact with the frame member 4 or the filter unit 3 is A filter mounting structure characterized in that the bar has an endless hollow 7 along the longitudinal direction of the bar and is formed of a suction cup surface coated with non-evaporable mucus.