Filter assembly

Abstract

An improved filter assembly (1) is disclosed, particularly for electric cabinets, comprising a filter cloth (5), a conveying sump (7) and a fan (9), equipped with at least one thermal-resistive sensor (11) placed next to at least one hole (13) obtained in the conveying sump (7).

Description

technical field

[0001] The present invention relates to an improved filter assembly, particularly for electrical cabinets. Background technique

[0002] In the prior art, for cooling electrical dashboards, air filtration systems are used equipped with fans (axial, radial, etc. types) adapted to force air through filter cloths adapted to filter the air.

[0003] In this known system, the fan applied to the filter assembly must overcome the resistance to the air passing through the filter, which occurs due to load leakage, which increases the pressure that the fan must exceed, resulting in a performance deteriorates.

[0004] In particular, when filter clogging increases, further flow decay cannot be calculated by the user and often falls (even faster in very dirty gases) to the minimum value that guarantees adequate cooling of the device placed in the electrical control box the following.

[0005] In this case, one solution that has been adopted is to provide the box with ...

Examples

Embodiment Construction

[0026] Referring to Figure 1, a prior art filter assembly for an electrical cabinet can be noted. This filter assembly is inserted into the wall 3 of the electric control box, as is known, from the outside of the box to the inside of the box in the direction of air flow F, consisting of a filter cloth 5, a delivery box 7 and a fan 9; In construction, three pressure ranges are generally defined: external pressure P1, intermediate pressure P2 between filter cloth 5 and fan 9 (equal to P1 minus filter load leakage), and internal head pressure P3 (equal to p2 minus fan prevalence). As mentioned earlier, it is clear that the fan 9 has to exceed the air passage resistance of the filter cloth 7, which occurs with load leakage which increases the pressure the fan has to overcome, subsequently degrading the performance in terms of air flow.

[0027] In order to measure the flow of air, two different modes of operation can be referred to: in the first case the flow will be measured dir...

technical field

[0001] The present invention relates to an improved filter assembly, particularly for electrical cabinets. Background technique

[0002] In the prior art, for cooling electrical dashboards, air filtration systems are used equipped with fans (axial, radial, etc. types) adapted to force air through filter cloths adapted to filter the air.

[0003] In this known system, the fan applied to the filter assembly must overcome the resistance to the air passing through the filter, which occurs due to load leakage, which increases the pressure that the fan must exceed, resulting in a performance deteriorates.

[0004] In particular, when filter clogging increases, further flow decay cannot be calculated by the user and often falls (even faster in very dirty gases) to the minimum value that guarantees adequate cooling of the device placed in the electrical control box the following.

[0005] In this case, one solution that has been adopted is to provide the box with ...

Examples

Embodiment Construction

[0026] Referring to Figure 1, a prior art filter assembly for an electrical cabinet can be noted. This filter assembly is inserted into the wall 3 of the electric control box, as is known, from the outside of the box to the inside of the box in the direction of air flow F, consisting of a filter cloth 5, a delivery box 7 and a fan 9; In construction, three pressure ranges are generally defined: external pressure P1, intermediate pressure P2 between filter cloth 5 and fan 9 (equal to P1 minus filter load leakage), and internal head pressure P3 (equal to p2 minus fan prevalence). As mentioned earlier, it is clear that the fan 9 has to exceed the air passage resistance of the filter cloth 7, which occurs with load leakage which increases the pressure the fan has to overcome, subsequently degrading the performance in terms of air flow.

[0027] In order to measure the flow of air, two different modes of operation can be referred to: in the first case the flow will be measured dir...

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