RU2518617C1 - Aerosol filter element - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: aerosol filter element contains fine purification filter with branch pipe of purified air discharge and hydrophilic filter, made in form of perforated manacle ring, on external surface of which enclosed in mesh casing coalescing shell, fixed between upper and lower covers, is installed. Lower cover is provided with circular projection with sealing element and holes in lower part for moisture discharge, and ends of perforated manacle ring are made with thread, on which upper and lower covers, in borings of which inside manacle ring hydrophobic filter is installed. Filter cartridge, enclosed in mesh jacket, provided with device for its tightening, is installed on the surface of mesh casing. In lower cover boring is made with circular chamber, provided with channels, output of which is located below sealing element. Fine purification filter is provided with replaceable shell from glass-paper layers.

EFFECT: increased service life of filtering element.

3 cl, 3 dwg

Description

The invention relates to a device for filtering air from aerosols.

A device for filtering air is known, comprising a housing with a tangential inlet of cleaned air, a branch pipe for removing purified gas and an outlet channel for discharging moisture and an aerosol filter element installed inside. The filtering element (figure 3) is made in the form of a coaxially located external coalescing filter (hydrophilic) and a fine filter (HEPA - filter) - hydrophobic. The coalescing filter can be formed from a corrugated fiberglass material with a pore size of about 0.2 microns. The components of the aerosol filter element are connected in a single block of the upper and lower covers, in which spacing annular protrusions are made, providing an annular gap between the filters. In the bottom cover there are drainage holes for moisture discharge (EPO application No. 1155729, IPC D01D 53/047, 2001).

The disadvantage of this filter is an increase in resistance during operation, which reduces its performance. If the filter performance decreases below the permissible value, the filter element is removed from the housing and replaced with a new one, since it is impossible to restore the original operating parameters of the element.

Also known is the aerosol filter element used in the device for filtering air, comprising a fine filter with a cleaned air outlet and a hydrophilic filter made in the form of a perforated shell, on the outer surface of which there is a coalescing shell enclosed in a mesh casing, placed between the upper and lower covers. The bottom cover is equipped with an annular protrusion with a sealing element and holes in the lower part to remove moisture. The ends of the perforated shell are made with a thread on which the upper and lower covers are installed, in the bores of which a hydrophobic fine filter is installed inside the shell, for example, in the form of a membrane element (RF patent No. 2224579 IPC B01D 46/00, 2004).

The disadvantage of this filter element is also an increase in resistance during operation, which reduces its performance. If the filter performance decreases below the permissible value, the filter element is removed from the housing and replaced with a new one, since it is impossible to restore the original operating parameters.

The objective of the invention is to increase the service life of the filter element.

The technical result of the claimed invention is to increase the service life of the aerosol filter element by ensuring its maintainability.

The technical result is achieved by the fact that in the aerosol filter element containing a fine filter with a cleaned air outlet and a hydrophilic filter made in the form of a perforated shell, on the outer surface of which there is a coalescing shell enclosed in a mesh casing fixed between the upper and lower covers, the lower the cover is provided with an annular protrusion with a sealing element and holes in the lower part for moisture removal, the ends of the perforated shell are made with a thread on which the upper and lower covers are installed, a hydrophobic fine filter, for example, in the form of a membrane element, is installed in the bores of the covers inside the shell, an replaceable filter is additionally installed on the surface of the mesh casing, enclosed in a mesh jacket equipped with a device for tightening it, the bore is made with an annular chamber equipped with channels, the outlet of which is located below the sealing element, and the fine filter is equipped with a removable shell of layers of glass paper.

The material of the filter cartridge can be made of glass paper and impregnated with a 30% fluoroplastic suspension -4.

A device for tightening the mesh shirt can be made in the form of staples.

Additional installation on the surface of the mesh casing of a replaceable filter enclosed in a mesh jacket equipped with a device for tightening it, performing a bore in the bottom cover with an annular chamber equipped with channels, the outlet of which is located below the sealing element, and supplying a fine filter with a replaceable shell made of layers of glass paper provides extended service life and maintainability by periodically replacing a replacement filter. During operation of the filtering element, the interchangeable filter and the replaceable casing become clogged by the delayed particles, which leads to an increase in their hydraulic resistance. In this case, the operating parameters of the filter element are restored by replacing the replacement filter components. This allows you to increase the resource of the aerosol filter element several times, since with this design the fine filter and coalescing filter work in control mode and practically do not change their operating parameters, further increasing the reliability of the filter element.

The implementation of the material of the replaceable filter from glass paper, impregnated with a 30% suspension of fluoroplastic -4, increases the selectivity of the filter and gives it hydrophobic properties, which ensures a more complete capture of the oily substances contained in the cleaned air, which increases the efficiency and service life of the replaceable filter.

The implementation of the device for tightening the mesh shirt in the form of brackets provides ease of installation and dismantling of the mesh shirt when replacing a replacement filter that increases the service life of the filter element. To remove the mesh shirt, the staples are unbent using any means at hand, such as a screwdriver. The shirt is tightened by folding the staples.

The drawings show the design of the aerosol filter element:

figure 1 shows a General view of the aerosol filter element, figure 2 shows the same as in figure 1, a longitudinal section, figure 3 shows the design of the fine filter.

The list of items indicated in the drawings:

1. fine filter;

2. a branch pipe of the purified air;

3. hydrophilic filter;

4. perforated shell;

5. top cover;

6. bottom cover;

7. annular protrusion;

8. sealing element;

9. holes in the bottom;

10. coalescing shell;

11. net casing;

12. replaceable filter;

13. mesh shirt;

14. the bracket;

15. The bore is cylindrical;

16. annular chamber;

17. channel;

18. interchangeable shell.

The aerosol filter element contains a fine filter 1 with a pipe (adapter) for the removal of purified air 2, placed with a gap in the hydrophilic filter 3. The hydrophilic filter 3 contains a perforated shell 4, on the threaded ends of which there is a top cover 5 and a bottom cover 6. In the top cover 5, a central hole is made for the passage of the outlet pipe for cleaned air 2. An annular protrusion 7 with a groove for the sealing element 8 and holes 9 located in the central part are made on the bottom cover 6. On the outer surface of the perforated shell 4 there is a coalescing shell 10 enclosed in a mesh casing 11. As a material for the coalescing shell, glass paper such as BMDK or BMDF, or thin metal mesh can be used. On the outer surface of the mesh casing 11 there is installed a filter 12 made in the form of a multilayer shell and a mesh jacket 13 fixed to the filter 12 by brackets 14. A cylindrical bore 15 is made in the bottom cover 6, with an annular chamber 16 and channels 17 located at the bottom of the bore the outlet of which is located below the annular protrusion 7. As a 6 fine filter 1, a filter element of the FEN-S 254 / A3 type manufactured by OAO Ural Electrochemical Plant or another membrane micro-silt can be used and ultrafiltration element, to increase selectivity and increase resource, placed in a removable shell 18 of six layers of glass paper BMD-K.

Aerosol filter element operates as follows. The source air, passing through the mesh jacket 13, enters the outer surface of the first filter cartridge 12, and then the coalescing shell 10. The filter cartridge 12 and the coalescing shell 10 absorbs droplet moisture, coalesces aerosols and traps dust particles. The air cleaned from moisture and dust enters through the perforation of the shell 4 into the annular cavity formed by the inner surface of the perforated shell 4 and the outer surface of the fine filter 1 and bounded by caps 5 and 6 from the ends. Passing through the fine filter 1, i.e. layers of glass paper shell 8 and a fine filter 1, the air is subjected to fine cleaning from aerosols, including oil mist. The air cleaned from aerosols enters the internal cavity of the fine filter 1, from where it enters the intake through the outlet pipe of the purified air 2. The retained particles and droplet water through the openings 9 are removed into the atmosphere together with the discharged air, thereby eliminating their accumulation in the filter. With strong humidification of the cleaned air, trapped moisture flows into the lower part of the replaceable filter 12 and through the bore 15 enters the annular chamber 16, from where it is removed outside the filter element through channels 17.

When the filter is in the air purification mode from atmospheric moisture and dust, when the resistance increases by 40-50% higher than the initial filter operation, the filter is stopped and the replacement filter 12 is replaced with a new one from the spare parts kit. To replace the replacement filter 12, the brackets 14 are opened, the mesh shirt 13 is removed and the used replacement filter 12 is removed and a new one is installed in its place. To replace the glass paper of the shell 18, it is enough to remove the fine filter 1 from the hydrophilic filter 3, for which the upper cover 5 is unscrewed, the fine filter 1 with the layers of the glass paper of the shell 18 wound on it is removed. After that, the used glass paper is replaced with a new one and the filter is assembled item in reverse order. Such a replacement provides an increase in the resource of the filter element by at least 2–3 times, while increasing the service life up to 5 years while maintaining the selectivity for oil fog level of 99.999%. The performance of the filter element is confirmed experimentally.

The proposed device provides an increase in the service life of the filter element by ensuring its maintainability.

Claims (3)

1. An aerosol filter element containing a fine filter with a clean air outlet and a hydrophilic filter made in the form of a perforated shell, on the outer surface of which there is a coalescing shell enclosed in a mesh casing, fixed between the upper and lower covers, while the bottom cover is provided with an annular a protrusion with a sealing element and holes in the lower part for removing moisture and the ends of the perforated shell are made with a thread on which the upper and lower edges are mounted flanges, in the bores of which a hydrophobic fine filter is installed inside the shell, for example in the form of a membrane element, characterized in that on the surface of the mesh casing an additional filter is installed, enclosed in a mesh jacket equipped with a device for tightening it, in the bottom cover the bore is made with an annular a chamber equipped with channels, the outlet of which is located below the sealing element, and the fine filter is equipped with a removable shell of layers of glass paper. 2. The aerosol filter element according to claim 1, characterized in that the replaceable filter material is made of glass paper and is impregnated with a 30% fluoroplastic suspension -4. 3. The aerosol filter element according to claim 1, characterized in that the device for tightening the mesh shirt is made in the form of brackets.

Images