CZ309991B6 - A tight air handling filter - Google Patents

Abstract

The tight air handling filter consisting of two or more longitudinal bellows and cross connectors, lies in the fact that the lower bellows (2) is hermetically attached to the perimeter frame (1) and the upper bellows consists of a system of pivoting segments (3) with joints (4), whereas a certain distances is between both bellows for the hermetical clamping of filtration fabric (5) wound on the system of cross connectors (6).

Description

Tight air filter

Field of technology

Find out about a tight air filter with replaceable filter media, intended primarily for air supply and exhaust air systems.

Current state of the art

At the present time, air conditioning systems mainly use cassette frame filters for filtering the supplied or extracted air, in which the filter medium is fixed (e.g. with steel mesh) against deformation, and the ends of the medium are covered with a sealant for hermetic sealing. The filter frames are made of plastic, possibly hardened paper or sheet metal.

The fundamental disadvantage of all these cassette filters is their high price and the impossibility of their regeneration, when after the exhaustion of their retention capacity or the expiration of the set period of operation, it is necessary to replace the entire expensive filter, including the frame, and install a new one.

These costs for the regular replacement of entire filters are today one of the essential cost items for the operation of the entire air conditioning system in case of air handling units. A non-negligible disadvantage of the current solution is also the environmental point of view, when today the entire filter is disposed of, because it forms one indestructible unit. Due to the tight connection of the individual parts, it is difficult, if not impossible, to separate the individual parts for their subsequent ecological recycling.

Woven skeleton filters with replaceable filter medium are also used exceptionally on the market. Assembly, and especially disassembly of these filters is very laborious and unhygienic, the fabric must be intricately woven into the frame of the filter. The filters are not suitable in terms of the required tightness, the assembly is very unintuitive and the resulting properties of the filter cannot be guaranteed.

The essence of the invention

The essence of a tight air filter is that it consists of a peripheral frame, two bellows and transverse couplings, where the lower bellows is hermetically attached to the peripheral frame and the upper pressure bellows consists of a system of rotating segments with joints, whereby there is a certain distance between the two bellows for hermetically sealing the filter fabric wound on a system of lateral couplings.

The tight air filter according to the invention enables very easy replacement even for non-professional operators, by simply inserting a strip of cheap filter media on the transverse couplings and wavy profiles of the lower bellows. By gradually winding the upper rotating bellows with transverse couplings, the filter medium is gradually pressed (link by link) between the two parts of the tight air filter. Completely simple assembly practically excludes incorrect installation of the filter media in the filter frame. It thus removes the fundamental disadvantages of frame cassette filters, which are their several times higher purchase price and the need to dispose of the entire filter.

At the same time, the leak-proof filter meets even the highest requirements for leak-proofness, which essentially eliminates the disadvantages of all woven skeleton filters used so far.

A tight air-technical filter also makes it possible to design substantially larger effective filter surfaces with high rigidity compared to non-rigid frame filters, with limited dimensions.

- 1 CZ 309991 B6

Clarification of the drawing

The attached drawing shows an example of a tight air filter, where: Fig. 1 shows a cross-section of the filter;

Fig. 2 shows in axonometry a section of the filter assembly with the indicated position of the filter fabric and the principle of gradual (link by link) pressing of the medium into the lower bellows; and Fig. 3 shows the principle of tight filter function.

Examples of implementation of the invention

Air-tight filter according to Fig. 1, 2 consists of a peripheral frame 1, a lower bellows 2, an upper high-pressure bellows consisting of a system of rotating segments 3 with joints 4 and a filter fabric 5 wound on a system of transverse couplings 6, which is terminated by a seal above the peripheral frame 1 7.

Claims (2)

1. A tight air filter, consisting of a peripheral frame, two or more longitudinal bellows and pnc couplings, characterized by the fact that the lower bellows (2) is hermetically attached to the 5 peripheral frame (1), and the upper bellows consists of a system of rotating segments (3) with joints (4), whereby there is a certain distance between the two bellows for the hermetic clamping of the filter fabric (5), wound on the system of lateral couplings (6). 2. Tight air filter according to claim 1, characterized by the fact that the system of lateral couplings (6) is terminated by a seal (7) above the peripheral frame (1).