EP1190757A1 - Electro-filter system - Google Patents

Abstract

The electrofilter system (1) comprises a filter unit (2), a prefilter unit (3) and at least one ventilator (5) for purifying an air stream. The filter unit has a filter cell (4) with a fine filter and the prefilter unit has a prefilter element (6) with a filter insert and a condensation chamber (7). The air stream is deviated once between the outlet from the condensation chamber and the inlet to the filter unit. Preferred Features: The air stream flows through the filter unit in the counter direction to the condensation chamber of the prefilter unit.

Description

The invention relates to an electrostatic filter system with a filter unit, a pre-filter unit and at least one fan for cleaning an air mass flow.

Air purification systems, especially electrostatic air filters, are from the The state of the art is widely known and found in practice primarily for air pollution control their application in operating rooms and production halls. Both known and working on the electrostatic principle air filters polluted air is sucked in and first passes z. B. a mechanical prefilter, in which the coarse dirt particles are removed. After that, in an electrostatic main filter removes the particles present in the intake air ionized by an ionizer so that the solid particles are charged on opposite poles Collector plates are deflected and stick to it. The liquid Particles (e.g. oil and emulsion) migrate from the collector plates into a housing base and flow via a return line into a tank, where it is disposed of can be. Unfortunately, such systems get dirty very quickly and then no longer work optimally. The known electrostatic air filters are therefore very maintenance-intensive and consequently also cost-intensive.

It is therefore the object of the invention to provide an electrostatic precipitator system which has an optimized efficiency over a long period of time is achieved and thus a long service life is granted without the electrostatic precipitator system requires a high level of maintenance.

The task is accomplished by an electrostatic precipitator system with the features according to claim 1 solved. Appropriate developments are in the dependent claims Are defined.

According to the invention, an electrostatic filter system has a filter unit, a pre-filter unit and at least one fan for cleaning an air mass flow. The Filter unit is provided with a filter cell with a fine filter and the pre-filter unit has a mechanical having at least one filter insert Pre-filter element and a condensation chamber. According to the invention the air mass flow between the outlet from the condensation space Pre-filter unit and the entry into the filter unit redirected at least once. By redirecting the direction of flow of the air mass flow is achieved that the particles condensing in the filter unit so automatically to the condensation chamber of the pre-filter unit, flow through it while cleaning at the same time. In addition, the pre-filter unit cooled by the already clearly cooled particles in the filter unit.

The direction of flow of the air mass flow is preferably in the filter unit essentially opposite to the direction of flow in the condensation space the prefilter unit. By redirecting the air mass flow around The maximum self-cleaning and cooling effect is achieved at 180 °.

In a further advantageous embodiment, the pre-filter unit becomes vertical is flowed through by the air mass flow. In yet another embodiment the pre-filter unit is at least partially vertically separated Flows through condensate. The vertical flow supports the self-cleaning effect the elements of the pre-filter unit because the condensed particles, For example, separated cooling lubricant during the draining one Most of the solid dirt particles are flushed out of the mechanical filters. About that In addition, the condensation space arranged in the pre-filter unit kept moist and cooled by the condensate separated in the filter unit. This optimizes the efficiency of the pre-filter unit.

In yet another advantageous embodiment, the filter unit and the pre-filter unit accommodated in respective housings. Preferably, the Housing at least partially arranged one above the other, so that in the filter unit separated condensate for cooling and cleaning at least one Part of the pre-filter unit recycled without additional feedback devices becomes. It is also advantageous that if the prefilter unit and filter unit in the Area of the condensation space of the pre-filter unit arranged exactly one above the other be, the electrostatic precipitator system only increases in height, with a Minimum footprint is used.

In an expedient development of the electrostatic filter system according to the invention the mechanical pre-filter element is variable with in the condensation space insertable filter inserts, the different filter inserts are interchangeable. The change of all inserts can be done manually without additional tools, so that advantageously no special devices are required. Can be used as filter inserts Expanded metal filters, swirl separators or agglomerators can be used. By using swirl separators, the maintenance cycle of the pre-filter elements and the fine filter can be increased. Through the specially designed Condensation space can particles that are already in the gas and Vapor phase, condense in the pre-filter unit and there be deposited. The condensation chamber is specially designed Provide baffle plates so that the air mass flow already has multiple deflections here learns what increases the condensation space or the separation path extended so that a high pre-separation is effected. At the same time due to this special design of the condensation chamber in the pre-filter unit the entire electrostatic precipitator system can still be kept compact.

The entire electrostatic filter system is preferably of modular construction. So can the filter unit can also be variably equipped, the fine filter either made at least one electrostatic filter cell or from a suspended matter filter cassette can exist. In addition, an electrostatic precipitator system can accommodate up to three Suction points are connected, the suction power at the respective Suction points can be set independently of one another. It is also possible that Supplement the electrostatic precipitator system with a post filter cell, the post filter cell in particular provided with an activated carbon filter for odor absorption can be. The modular structure of the electrostatic precipitator system makes it possible by combining specially suitable filter elements, the electrostatic precipitator system adapt to the most diverse requirements.

In yet another embodiment of the invention, as the Differential pressure due to increased deposition of foreign particles Fan speed control an electronic signal via an interface forwarded to the blower having an integrated speed control. This ensures a constant suction performance of the electrostatic filter system.

The fan is preferably connected downstream of the filter unit and also up different purposes interchangeable or replaceable. The integrated Speed control of the blower also allows the blower for the ideally set a special application and thereby the efficiency of the electrostatic precipitator system.

The invention is described below in an embodiment with reference to the accompanying Drawings explained.

Fig. 1

eine perspektivische Ansicht eines aus dem Stand der Technik bekannten Elektrofilter-Systems;

Fig. 2

eine Querschnittsansicht durch das erfindungsgemäße Elektrofilter-System;

Fig. 3

eine Draufsicht auf einen Filtereinschub;

Fig. 4

eine Querschnittsansicht durch den Kondensationsraum.

The drawings show:

Fig. 1

a perspective view of an electrostatic filter system known from the prior art;

Fig. 2

a cross-sectional view through the electrostatic filter system according to the invention;

Fig. 3

a plan view of a filter insert;

Fig. 4

a cross-sectional view through the condensation space.

In Fig. 1 is a perspective view of a known from the prior art Electro filter system 1 shown. The air mass flow L is without to experience a change of direction first through a pre-filter unit 3, then through an ionizer 13 and between the adjoining collector plates 14 passed through the filter unit 2 and finally passes a post-filter 15. The solid dirt particles remain in the filter unit 2 on the collector plates 14 stick and the liquid particles, such as oil and emulsion, migrate from the collector plates 14 in the housing bottom (not shown) and flow via a return line (not shown) back into a collecting tank (not shown). The filtered air is returned to the ambient air behind the post-filter unit 15 initiated.

2 is a cross-sectional view through the electrostatic filter system according to the invention 1 shown. The unfiltered air is fed through a suction nozzle to a suction point 12 introduced into the electrostatic precipitator system 1 and first passes through the Condensation chamber 7. Here the air mass flow L on in the condensation chamber 7 provided baffle plates 9 already deflected several times, which is cooling of the air mass flow L. In the pre-filter unit 3, which up to can hold five filter elements 6, three filter elements 6 are provided, which are equipped with mechanical filters. Between leaving the Pre-filter unit 3 and the entry into filter unit 2 becomes the air mass flow L deflected. The deflected air mass flow flows through at the inlet of the filter unit 2 L the filter unit 2 in the opposite direction to that in the condensation chamber 7. The filter cell 4 of the filter unit 2 is here as a single-stage filter provided and equipped with an electrostatic filter cell; in case of a two-stage filter, two electrostatic filter cells can also be provided become. The condensate separated and cooled in the filter cell 4 flows vertically downwards into the condensation space 7 of the pre-filter unit 3, whereby the condensation space 7 is cleaned and cooled. After flowing through the condensation chamber 7 of the pre-filter unit 3, the condensate in one Collection basin collected and removed. The filter unit 2 and the pre-filter unit 3 are one above the other in the area of the condensation space 7 of the prefilter unit 3 arranged in respective housings 10 and 11, whereby u. a. the compact structure of the electrostatic filter unit 1 is also given.

3 shows a plan view of a filter insert 8 in the form of a swirl separator, which can be inserted into the pre-filter elements 6 of the pre-filter unit 3. 4 is a schematic view of the air mass flow control in detail shown by the condensation space 7. The polluted air is over a Intake of a suction point 12 introduced into the condensation space 7. On two opposing boundary walls 17, 18 of the condensation space 7 baffle plates 9 are provided, which are offset from each other in mirror symmetry the boundary walls 17, 18 angularly in the direction of the condensation interior extend so that the flow path of the air mass flow L is not straight is, but undergoes a deflection on each baffle plate 9, so that the condensation path is extended.

LIST OF REFERENCE NUMBERS

1

Electrostatic filter system

2

filter unit

3

prefilter

4

Filter cell of the filter unit

5

fan

6

prefilter

7

condensation chamber

8th

filter slot

9

baffle

10

Filter unit housing

11

Pre-filter unit housing

12

extraction point

13

ionizer

14

collector plate

15

After-filter

16

condensate

17

boundary wall

18

boundary wall

Claims (10)

Electro filter system (1) with a filter unit (2), a pre-filter unit (3) and at least one blower (5) for cleaning an air mass flow, the filter unit (2) being a filter cell (4) with a fine filter and the pre-filter unit (3) has at least one filter insert (8) having mechanical prefilter element (6) and a condensation space (7) and the air mass flow between the outlet from the condensation chamber (7) of the pre-filter unit (3) and the inlet is deflected into the filter unit (2) at least once. The electrostatic precipitator system (1) according to claim 1, wherein the filter unit (2) substantially in the opposite direction to the condensation space (7) of the pre-filter unit (3) flows through the air mass flow becomes. The electrostatic precipitator system (1) according to claim 1, wherein the prefilter unit (3) through which the air mass flow flows vertically. Electrofilter system (1) according to one of claims 1 to 3, in which the pre-filter unit (3) is at least partially vertically separated Condensate (16) is flowed through. Electrofilter system (1) according to one of claims 1 to 4, wherein the Air mass flow within the condensation space (7) through special executed baffle plates (9) is deflected. Electrofilter system (1) according to one of claims 1 to 5, wherein the filter unit (2) in a housing (10) and the pre-filter unit (3) in one Housing (11) are included. The electrostatic precipitator system (1) according to claim 6, wherein the housing (10) Filter unit (2) and the housing (11) of the pre-filter unit (3) such that in particular at least partially one above the other, that the Condensate separated in the filter unit (2) for cooling and cleaning at least part of the prefilter unit (3) is used. Electro filter system according to one of claims 1 to 7, wherein the mechanical Pre-filter element (6) can be variably inserted into the pre-filter unit (3) Filter cartridges (8) can be equipped, and the different Filter inserts (8) are interchangeable. An electrostatic precipitator system according to any one of claims 1 to 8, in which the variable filter inserts (8) expanded metal filter, swirl separator or Are agglomerators. Electrofilter system according to one of claims 1 to 9, which increases the differential pressure due to increased deposition of foreign particles an electronic signal to control the speed of the fan (5) the fan (5) has an integrated speed control.

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