JPH0335373Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air filter for the purpose of removing salt from filtered air in, for example, a semiconductor factory located on the sea side.

[Prior Art] Conventionally, there has been no air filter for the purpose of removing salt, and an air filter in which a single filter medium is simply folded into a pleated shape has been used.

[Problems that the invention aims to solve] In the conventional air filter, which has a single piece of filter material folded into a pleated shape, the salt that had been trapped in the filter material deliquesces due to the relative temperature increase of the ventilated air, and becomes water droplets. The problem is that the water droplets penetrate into the filter medium, reach the back side of the filter medium, and scatter on the downstream side of the air filter. It has been considered to install another air filter having the same or higher collection efficiency on the downstream side, but this has the problem of increasing installation space and increasing pressure resistance.

The present invention was developed to solve the above problems, and is an air filter for the purpose of removing salt that can efficiently remove salt, requires less installation space, and does not increase pressure resistance. The purpose is to provide the following.

[Means for Solving the Problems] In order to achieve the above object, the present invention is constructed by sandwiching a spacer having a void between two pleated water-repellent filter media. There is.

[Function] According to the present invention having the above configuration, by sandwiching the spacing member having a gap between two water-repellent filter media, a complete space is provided between the two filter media, and the front Water droplets containing salt that have permeated through the filter media fall along the back surface of the front filter media, and even if the water droplets move to the rear filter media, the water droplets fall on the surface of the rear filter media, which has water-repellent properties, and are removed from the rear filter media. Removes salt from filtered air without reaching the back surface.

[Example] An example of the implementation of the present invention will be described in detail with reference to the drawings. A complete space is formed between two filter media 1 and 2 folded into pleats having water-repellent properties such as glass fiber or polypropylene. In order to provide this, an air filter 5 is formed by sandwiching a spacer 4 having a gap 3 between the filter media 1 and 2. Although the spacer 4 does not need to be particularly limited, it preferably has a thickness of 1 to 2 mm, and one mesh is
A net-like sheet 6 having voids (grids) 3 having a size of about 10 is recommended. In addition, 7 in the figure
8 is a separator, and 8 is a filter frame.

In this way, by providing a complete space between the two water-repellent filter media 1 and 2 by the void 3, water droplets containing salt that have permeated through the filter media 1 fall downward along the back surface of the filter media 1. This prevents water droplets from penetrating into the filter medium 2, and even if the water droplets move to the filter medium 2 through the spacer 4, the water repellency of the filter medium 2 prevents the water droplets from falling downward on the surface of the filter medium 2. hand,
Water droplets containing salt are removed without penetrating the back surface of the filter medium 2.

[Effect of the invention] Since the invention is as described above, a space is completely provided between the two filter media, and this space allows water droplets containing salt that have penetrated the front filter media to be absorbed by the front filter media. By dropping the water droplets downward on the back side of the filter, it prevents water droplets from penetrating into the rear filter material, and even if water droplets move to the rear filter material, the water repellency of the rear filter material will prevent water droplets from penetrating into the rear filter material.
Salt in the filtered air can be removed efficiently by causing water droplets to fall on the surface of the rear filter medium without reaching the back surface of the rear filter medium, and without scattering salt onto the downstream side of the air filter. be. Furthermore, this invention requires only one structure by making the filter medium a double structure, so it requires less installation space and can keep pressure loss low, and can be provided at low cost. possible.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is an overall front view, and FIG. 2 is a partially enlarged sectional view taken along the line A--A in FIG. 1. In the figure, 1 and 2 are filter media, 3 is a gap, 4 is a spacer, 5 is an air filter, and 6 is a mesh sheet.

Claims (1)

[Claims for Utility Model Registration] 1. An air filter for the purpose of removing salt, which comprises a spacing member having voids sandwiched between two water-repellent filter media. 2. An air filter for the purpose of removing salt according to claim 1, wherein the spacer is a reticulated sheet. 3. The air filter for the purpose of removing salt according to claim 2, wherein the mesh sheet has a thickness of 1 to 2 mm, and each mesh has about 10 voids.