ITGO20100001A1 - AIR FILTRATION MODULE FOR AIR CLEANER WITH SEPARATE FILTERING CHAMBER - Google Patents

Description

Description of the Patent for Invention entitled: Air filtration module for purifier with separate filter chambers.

Air filtration module for purifier with separate filter chambers.

Field of application

The invention relates to a very high efficiency filtration module having two separate filtration chambers to be inserted in any air purifier.

State of the art

Currently, high efficiency filters are used to purify fine dusts. However, these filters are not very efficient in purifying ultra-thin powders smaller than 0.1 micron (MW 0.1), particles so small that they cross the alveolar barrier and enter directly into the bloodstream. Ultra-thin powders are concentrated in the internal organs where they become the main source of serious pathologies with the consequent high hospital and medicinal costs and constitute one of the primary causes of mortality.

To have high filtration of these killer particles it is necessary to use very high efficiency filters, such as ULPA filters for operating rooms. Their filter fabric is made up of extremely compact microfibres, with very small passages, so they quickly clog up if they do not have excellent pre-filtration achieved through a high-efficiency filter positioned before the filter itself. A very high efficiency filter has a very high pressure drop and by adding to this the loss of the high efficiency filter placed in series, one obtains such a high resistance to the passage of air as to require extremely powerful fans, which is not admissible. for small civil uses. Alternatively, the pressure drop can be reduced by using a very large filtration surface, also in this case not commercially feasible, both in terms of size and cost.

If you want to retain dust for at least Γ 85% of the maximum accumulation capacity, the final resistance value can increase up to four or five times the starting value which means, with the same fan power, an air flow reduced by 70 - 80. % of face value.

But already when the air flow is reduced by 30 - 40%, the dirty filter light comes on or when the filter is blackened with decreased air expulsion, the filter is usually replaced. A dirty filter has an excellent air filtration efficiency, but has an air flow rate that is too low, with a consequent lengthening of the times to filter all the air in the environment. not being able to spread throughout the environment, so overall purification is in any case insufficient.

For this reason, therefore, the filters are eliminated when they begin to have the maximum filtration efficiency of ultra-fine dust and long before reaching their maximum dust accumulation capacity, with economic and pollution damage due to their disposal.

SUMMARY

The main purpose of the invention in question is to solve the aforementioned problems by providing users with an air filtration module with a high air flow rate, capable of obtaining a significant purification of ultra-fine PM 0.1 powders.

This and other purposes are achieved by the air filtration module in question, which comprises a first filtration chamber, at least a second filtration chamber and a corridor.

Each filtration chamber houses, in sequence, a coarse filtration net, a thin mat for the filtration of coarse powders and a pre-filter for the filtration of medium-coarse powders.

The coarse, metal or plastic filter mesh with fine meshes, captures the larger parts such as visible dust, wads, etc. etc. This mesh, which clogs up in a very short time, is easily removable and washable. The coarse dust mat is flat and no more than ten millimeters thick, with very wide fibers to capture only coarse dust, in order to extend the life of the next filter. The mat can be thicker if used in very dusty environments. This filter can also be absent. The pre-filter for medium-coarse filtration can consist of an additional flat mat but with a greater density than the previous one or, preferably, a filter with a thin, high-density, pleated sawtooth mat.

At the bottom of the first filtration chamber there is a high efficiency filter for fine dust, inserted in a rigid perimeter frame. At the bottom of the second filtration chamber is placed a previously used high efficiency filter full of dust, with a very reduced passage of air coming from the second filtration chamber.

If a first filtration chamber housing the new high-efficiency filter and more filtration chambers housing the previously used high-efficiency filters is used, the third filtration chamber houses the previously used filter filled with dust from the second filtration chamber, and the fourth filtration chamber houses the previously used filter filled with dust from the third filtration chamber and so on.

Each dust filtration chamber consists of a polygonal truncated pyramid-shaped compartment, preferably with a quadrangular section, having the main base completely open and facing outwards (to insert all the filtering elements in sequence) and the smaller base facing inwards of the purifier and open almost completely except for a small perimeter frame. The two bases are parallel. The new or used high efficiency filter is placed on the perimeter frame of the smaller base. The side walls of each filtration chamber are linear or stepped to form one or more perimeter leaves against which the other filters will be placed.

To ensure the hermetic seal of the new and used high efficiency filters, a rubber gasket, foam rubber or other compressible material is used, positioned between the rigid frame surrounding the high efficiency filter and the perimeter frame surrounding the smaller base.

To avoid lateral movements of the new and used high efficiency filters and to fix them better, a second sealing gasket, made of flexible material, can be positioned along the peripheral edge of the rigid frame that surrounds the high efficiency filter.

The pre-filter for medium-large filtration also has a sealing gasket, made of flexible material, along its peripheral surface. The coarse filtration net and the thin mat for coarse dusts are instead without gaskets and simply placed on the pre-filter for medium-large filtration. The coarse filtering net can also be inserted in the front air intake grille.

The openings in the smaller bases of the chambers are connected with a corridor, which acts as a collector for all the filtration chambers. The corridor is delimited by side walls, at least one of which is opposed to the smaller bases of the filtration chambers, by two end walls and by the perimeter walls that surround the smaller bases of the chambers.The corridor conveys the outgoing air to the remaining part of the purifier by means of at least one opening made on a corridor wall or on one of its ends.

The filtration module in question has the following advantages:

- when the high efficiency filter becomes clogged up to significantly reduce the air flow rate, it is not eliminated but is reused in the second filtration chamber as a very high efficiency filter;

- with the two filters in parallel there are two different filtration efficiencies at the same time: the new filter will have a low PM 0.1 filtration but high air flow rates, while the recovered filter full of dust will have a reduced air flow , but still optimal for filtering ultra-fine PM 0.1 particles with very high efficiency;

- the very high efficiency filter thus obtained allows significant management savings and a reduction in pollution by having fewer filters to be disposed of in landfills;

- the two filters are parallel one next to the other, so the air flow is the sum of the two flow rates.

BRIEF DESCRIPTION OF THE DRAWINGS

The subject matter of the present patent is fully clarified in all its relevant features by the description of a particular embodiment, preferred but not exclusive, of the filtration module illustrated by way of indication but not of limitation, in the accompanying drawings, in which:

- Figure 1 shows a front view of the filtration module without the front panel and without filters, with a view of the air outlet holes from the corridor towards the fan;

Figure 2 shows a section along the plane A-A of Fig. 1 of the filtration module;

- Figure 3 shows a section along the B-B plane of the filtration module. DETAILED DESCRIPTION OF A FAVORITE EXAMPLE OF EXECUTION

More particularly and with reference to the attached drawings, the filtration module 1 in question comprises a first filtration chamber 1.1 and a second filtration chamber 1.2. The filtration chambers 1.1, 1.2 are separated from each other, but constrained by a 1.3 perimeter frame.

Each filtration chamber 1.1, 1.2 consists of a truncated pyramid-shaped compartment with a square base delimited by four side walls 1.4. The larger base is completely open and facing outwards and the smaller base is facing the inside of the purifier and open almost completely except for a small perimeter frame 1.5. The two bases are parallel.

The dust filtration zone 1 is closed at the front by a grid panel 1.6 which acts as an external covering.

Each filtration chamber 1.1, 1.2 houses in sequence, starting from the perimeter frame 1.3, a coarse filtration mesh 2.1, a thin mat 2.2 for the filtration of coarse powders and a pre-filter 2.3 for the filtration of medium-coarse powders.

At the bottom of the first filtration chamber 1.1 a high efficiency filter 2.4 is placed for fine dust inserted in a rigid perimeter frame At the bottom of the second filtration chamber 1.2 a high efficiency filter 2.5 is placed, already used previously and coming from the first filtration chamber 1.1. The truncated pyramid arrangement of the side walls 1.4 allows easy insertion and extraction of filters 2.4, 2.5 through the opening constituting the major base facing the outside of the purifier. The perimeter frame 1.5, very narrow, which surrounds the bottom of each filtration chamber 1.1, 1.2 serves as a sash to support the filters 2.4, 2.5.

A soft gasket 2.6 is placed between the rigid frame that surrounds each high efficiency filter 2.4, 2.5 and the perimeter frame 1.5 that surrounds the smaller base of each filter chamber 1.1, 1.2. The soft gasket 2.6 prevents the passage of air outside the rigid frame that surrounds each filter 2.4, 2.5. Furthermore, each rigid frame is surrounded along its peripheral edge by a second very soft gasket 2.7. It is compressed while the filter 2.4, 2.5 advances towards the bottom, adapting to the inclination of the side walls 1.4 and prevents the filter 2.4, 2.5 from moving. The 2.3 pre-filters also have a 2.8 perimeter seal with the same function. The coarse filtration mesh 2.1 and the thin mat 2.2 for coarse dusts are instead without gaskets and simply placed on the pre-filter 2.3 for medium-coarse filtration.

The openings in the minor bases of the rooms 1.1, 1.2 are connected with a corridor 1.7 delimited by a wall 1.8 opposed to the minor bases, by two side walls 1.9, 1.10, by two end walls 1.11, 1.12 and by the perimeter walls 1.5 which surround the minor bases of chambers 1.1, 1.2.

Corridor 1.7 acts as a collector for the outgoing air from both filtration chambers 1.1, 1.2 to the remaining part of the purifier through two openings 1.13, 1.14 made on wall 1.8 and on its end walls 1.11, 1.12 open. The filtration module thus conceived is susceptible of numerous further modifications and variations, all falling within the scope of the inventive concept. Furthermore, all the details can be replaced with other technically equivalent ones.

Claims (1)

CLAIMS 1 - Very high efficiency air filtration module, in which there is a coarse filtration net (2.1), a thin mat (2.2) for the filtration of coarse dust, a pre-filter (2.3) for the filtration of medium-large dust and a high efficiency filter (2.4, 2.5), characterized in that it comprises a first filtration chamber (1.1), at least a second filtration chamber (1.2) and a corridor (1.7); at the bottom of the first filtration chamber (1.1) there is a high efficiency filter (2.4) for fine dust, at the bottom of the second filtration chamber (1.2) there is a filter (2.5) already used previously and with a lot of dust coming from the first filtration chamber (1.1); preferably the high efficiency filter (2.4, 2.5) is inserted in a rigid perimeter frame; the openings present in the minor bases of the chambers (1.1, 1.2) are connected with the aforementioned corridor (1.7) delimited by the side walls (1.8, 1.9, 1.10), at least one of which is opposite the smaller bases of the filtration chambers (1.1 , 1.2), by two walls (1.11, 1.12) at the end of the corridor itself and by the perimeter frames (1.5) that surround the minor bases of the rooms (1.1, 1.2); said corridor (1.7) is connected to the remaining part of the purifier through at least one opening (1.13, 1.14) made on the side walls (1.8, 1.9, 1.10) or through its end walls (1.11, 1.12). 2 - Very high efficiency air filtration module, according to Claim 1, characterized by the fact that each dust filtration chamber (1.1, 1.2) consists of a polygonal truncated pyramid-shaped compartment delimited by side walls (1.4), preferably with a section quadrangular, having the main base completely open and facing outwards and the minor base facing the purifier's color and almost completely open except for a small perimeter frame (1.5); the two bases are parallel; the dust filtration area (1) is closed at the front by a grilled panel (1.6) which acts as an external cladding; the side walls (1.4) can be linear or stepped to form one or more perimeter leaves against which the other filters will be placed. 3 - Very high efficiency air filtration module, according to Claim 1, characterized in that each filtration chamber (1.1, 1.2) houses in sequence, starting from the perimeter frame (1.3), a coarse filtration net (2.1), a thin mat (2.2) for the filtration of coarse dusts, a pre-filter (2.3) for the filtration of medium-large dusts and, at the bottom of the first filtration chamber (1.1) the said high efficiency filter (2.4, 2.5) for fine dust; if a first filtration chamber (1.1) housing the new high-efficiency filter (2.4) and more previously used high-efficiency filter chambers (2.5) is used, the third filtration chamber houses the filter previously used and full of dust coming from the second filtration chamber, the fourth filtration chamber houses the filter previously used and full of dust from the third filtration chamber and so on. 4 - Very high efficiency air filtration module, according to claims 1 and 3, characterized by the fact that the coarse filtration net (2.1) or the thin mat (2.2) for the filtration of coarse dust or the pre-filter (2.3) for the filtration of medium-large dusts they may be absent. 5 - Very high efficiency air filtration module, according to claims 1 and 2, characterized by the fact that the high efficiency filters (2.4, 2.5) rest on the perimeter frame (1.5), which surrounds the smaller base of each filtration chamber (1.1, 1.2) a gasket (2.6) made of rubber, foam rubber or other compressible material, is positioned between the rigid frame surrounding each high efficiency filter (2.4, 2.5) and the corresponding perimeter frame (1.5) surrounding the smaller base of the filtration chamber (1.1, 1.2). 6 - Very high efficiency air filtration module, according to claims 1, 3 and 4, characterized in that the side walls (1.4) of each filtration chamber (1.1, 1.2) are linear or stepped to form one or more leaves the perimeter against which the coarse filtration mesh (2.1), the thin mat (2.2) for the filtration of coarse powders and the pre-filter (2.3) for the filtration of medium-coarse powders will be placed. 7 - Very high efficiency air filtration module, according to the preceding claims, all as previously described and illustrated in the attached drawings.