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1. (WO2018162792) AN ELECTROSTATIC FILTER AND A RACK FOR FILTER PLATES OF AN ELECTROSTATIC FILTER
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Claims:

1 . A rack for supporting filter plates of a frameless filter and supplying electric voltage, wherein the rack (10) is an elongated member comprising a plurality of notches (1 1 ) on a longitudinal side of the rack (10) for supporting a plate arranged to a notch (1 1 ), and comprising a connecting structure (13) in both ends of the rack (10) for connecting the rack (10) to supporting structures of the frameless filter, and wherein the rack (10) further comprises a slot (12) for adhesive arranged to be used at least for attaching the plates to the rack (10), and which slot (12) is arranged on the opposite side of the rack (10) than notches (1 1 ).

2. A rack according to claim 1 , wherein the rack (10) is made of plastic.

3. A rack according to claim 1 or 2, wherein the rack (10) is made of electrically non-conductive material.

4. A rack according to claim 1 or 2, wherein the rack (10) is made of electrically conductive material.

5. A rack according to any of claim 1 to 4, wherein the filter plates are arranged to be attached to the rack (10) by adhesive in the slot (12).

6. A rack according to any of claim 1 to 5, wherein the rack (10) that is further arranged to act as an electric voltage supply rack for filter plates.

7. A rack according to claim 6, wherein the filter plates are arranged to be attached to the rack (10) by electrically conductive adhesive.

8. A rack according to any of claim 1 to 7, wherein the rack (10) further comprises at least one electrical connector.

9. A frameless electrostatic filter (20) comprising a plurality of racks (21 , 27) according to any of claims 1 to 8 and a plurality of electrically conductive filter plates (22, 23) arranged as a stack one on the other, and wherein a first part of the filter plates (22) are arranged into a first electric potential and a second part of the filter plates (23) are arranged into a second electric potential, and wherein a first part of the racks (21 ) are arranged to support only the first part of the filter plates (22) and a second part of the racks (27) are arranged to support only the second part of the filter plates (23) so that each rack (21 , 27) supports a plurality of filter plates (22, 23) and each plate (22, 23) is supported by a plurality of racks (21 , 27), and wherein every other filter plate (22) of the stack is arranged into the first electric potential and every other plate (23) into the second electric potential so that an electric field is formed between filter plates (22, 23), and wherein there is an opening (24) in the plates (22, 23) at that point where the plates (22, 23) are aligned with a rack (21 , 27) but are not arranged to be attached to that rack (21 , 27), and wherein at least one rack of the first part of the racks (21 ) is arranged to supply first electric voltage to the first part of the plates (22) and at least one rack of the second part of the racks (27) is arranged to supply second electric voltage to the second part of the plates (23), and wherein the electrostatic filter (20) comprises a supporting structure above and under the filter (20).

10. An electrostatic filter according to claim 9, wherein electrically conductive adhesive is used in a slot (26) of racks (21 , 27) arranged to provide electric voltage for plates.

1 1 . An electrostatic filter according to claim 9 or 10, wherein electrically non-conductive adhesive is used for attaching plates to a slot (26) of racks (21 , 27) arranged to support plates (22, 23).

12. An electrostatic filter according to any of claim 9 to 1 1 , wherein the filter (20) is connected to another electrostatic filter for forming a combined electrostatic filter.

13. An electrostatic filter according to claim 12, wherein the filter (20) is connected to another electrostatic filter so that a right-angle is formed so that both electrostatic filters form a half of the corner structure of the combined electrostatic filter.

14. An electrostatic filter according to claim 12 or 13, wherein racks (32a, 32b) arranged to provide electric voltage for plates (22, 23) are arranged inside the combined electrostatic filter.