FI84233C - Point ventilation method and point ventilation device - Google Patents

Description

5,84233

Target ventilation method and target ventilation unit Punktventilationsförfarande och punktvencilacionsanordning

The invention relates to a target ventilation method and a target ventilation device.

10 Targeted methods for removing air pollutants are known, in which a separate suction is directed directly to the workplace-specific source of pollutants. The air of the impure device is then further treated and taken for either cleaning and / or heat recovery. Thus, workplace contaminants are adapted to move to separate treatment.

15

It is an object of the invention to provide a new type of target ventilation method in which air containing contaminants is adapted to move away from a work station so that it does not enter the breathing zone of a person working at the work station.

20

According to the invention, the pollutant air of the workstation is removed by a device comprising an airflow fan or the like, wherein the air or gas containing the impurities or the supernatant of the workstation is sucked out of the workstation by the fan and the air or gas is removed from the device. According to the invention, pollutant air is transferred to the collection zone by means of a target ventilation device, for example in the vicinity of the pollutant boundary layer near the roof of the room.

In another preferred embodiment of the invention, the air is transferred directly from the work station to another room by means of a target air exchange device.

The target ventilation method according to the invention is mainly characterized in that the method uses a target ventilation device 35 by means of which impure air and / or gas and / or superheat of the workstation are transferred from the room occupancy and / or respiration zone to the 2 84233, using displacement ventilation in which fresh air is brought into the room space in the living area of the room and air is removed from the pollutant air layer from the top of the room through a duct and / or opening, the duct also first being removed from the air source. is released near the impurity boundary layer.

The target ventilation device according to the invention is mainly characterized in that the target ventilation device comprises an exhaust duct 10 arranged so that the air or gas flowing through it is transferred to a contaminant collection zone from which .

15

The invention will now be described with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, to which, however, the invention is not intended to be exclusively limited.

Figure 1 schematically shows a first preferred embodiment of the method according to the invention.

Figure 2 shows another preferred embodiment of the method according to the invention.

25

Figure 3 shows a target ventilation device used in the method according to the invention.

Figure 4 schematically shows a third preferred embodiment of the method 30 according to the invention.

Figure 1 shows a first preferred embodiment of the method according to the invention. The room space H comprises a target ventilation device 10 at the workstation 18. The wide suction surface of the suction opening 12 of the target extraction device 10 is arranged to be located on the workbench 19 at the workstation 18 above the workstation, e.g. the soldering point of circuit boards. The intake opening 12 of the body 11 of the target ventilation device 3 84233 is located in front of the person P working at the work station so that contaminants pass directly from the work station to the suction opening 12 of the body of the target ventilation device 10 through the perforated plate 12 'perforation 12a or the like 5. In the method according to the invention, the target ventilation device 10 comprises an exhaust duct 13 connected to the body 11, which is rigidly connected to the body 11 and which exhaust duct 13 supports itself. The fan 14 is arranged either directly in the outlet duct 13 or in the body jacket 11.

The embodiment of Figure 1 involves displacement ventilation and fresh air is introduced into the room H to the breathing zone and preferably from the lower part of the room to feel the floor L via the inlet ducts 16a and / or 16b as shown by the arrows. In displacement ventilation, the air pollutants are not mixed with the room air, but have migrated to the roof K of the room H 15 and form a layer of pollutant air there. With the device 10 according to the invention, the air containing the impurities of the work station 18 is conveyed directly to the impurity boundary layer R by means of the air flow provided by the fan 10. At the end of the outlet duct 13 of the target ventilation device 10 there is a diffuser 15, the function of which is to distribute the air 20 evenly with a small impulse to the feel of the impurity boundary layer, preferably above it. The air discharged from the exhaust duct 13 is marked with an arrow L *. The aim is not to mix the impure air above the boundary layer R below the boundary layer R. Thus, the function of the diffuser is to distribute the air with a small impulse over a wide area 25 above the boundary layer R or slightly below the boundary layer, from where it moves above the boundary layer. Further, the air containing impurities and / or superheat of the work station 18 is removed from the room H via the duct 17 and / or for cleaning and / or heat recovery. The duct 17 is adapted to accommodate the feel-30 mass of the roof K of the room H. The air to be removed from the room is marked with an arrow C2.

Figure 2 shows another preferred embodiment of the method according to the invention. In the method according to the invention, the target ventilation device 10 is adapted to transfer the air 35 containing the impurities of the work station 18 directly from the room space Hx to the impurity collection point Hx as shown in the figure to the second room space H2. If exhaust air is used in room H2, i.e. fresh air is introduced into the lower part of the room through duct 16 and air is removed from the upper part of room H2 through duct 17, the pollutant air or gas above.

Figure 3 shows a third preferred embodiment of a target ventilation device according to the invention. The target ventilation device 10 comprises a body jacket 11 with a suction opening 10 12 directed towards the object of contamination. The suction opening 12 comprises a perforated plate 12 'with a plurality of slats and / or holes 12a and / or slits or the like through which air is sucked. The apparatus comprises an outlet duct 13, preferably a rigid metal tube, directly connected to the body jacket 11. A suction blower 14 is fitted in the tube 13.

15

An embodiment of the device according to the invention is also possible, in which the fan 14 is located directly inside the body shell 11.

As shown in Fig. 3, the upper end 3 'of the outlet duct 13 is arranged to be located in the vicinity of the pollutant boundary layer R of the room space. In the figure shown in Fig. 3, the end 13 'of the outlet channel 13 is located above the boundary layer R. The device is provided with a diffuser 15 shown in Fig. 3, the function of which is to distribute the air evenly with a small impulse over as wide an area as possible in the upper part of the room so that the impure air does not mix with the rest of the room air.

The outlet duct 13 supports itself, but an embodiment is also possible in which the outlet duct 13 is supported by separate support arrangements.

30

In a preferred embodiment of the invention, the diffuser 15 is formed of a bag of flexible material comprising a perforation 15 '. Through the perforation 15 ', air is discharged from the end 13' of the tube 13.

Figure 4 shows a third preferred embodiment of the cowardly method of the invention. As shown in Figures 4, the room H is provided with displacement ventilation, i.e. air is preferably introduced into the room from the duct 16 and dirty room H air is removed from the duct 17 from the top of the room above the impurity limit layer R. Without entering the room space is marked with arrow C: and without removing 5 from room room H is marked with arrow C2. The supply of air to the room is arranged to take place by its own fan and, correspondingly, the supply of impure air from the room is arranged to take place by means of a suction preferably provided by a fan placed in the duct 17. In the method shown in Fig. 4, the actual target suction is applied to the workplace impurity air or the impurity-10 gas or the workstation superheat via the actual target suction duct 20 by means of a fan 21 in the duct 20. Through this channel, the majority of workplace contaminants are removed. By means of additional object suction, which is provided e.g. by a device such as that shown in Fig. 3, the residual impurities of the workstation are removed. In the method shown in Fig. 4, with the additional suction and the actual target suction, the impurities and / or the superheat transferred from the work station are released to the same room H where the work station is located.

In the preferred embodiment of the invention shown in Fig. 4, workplace contaminants and / or superheat are conveyed and released by additional target suction via duct 13 in a room H with displacement ventilation or a corresponding room space H below the pollutant boundary layer R. 25 near the layer R and preferably above the impurity limit layer.

Fig. 4 shows in dashed lines an embodiment of the invention in which contaminants and / or superheat are transferred out of a room H with displacement ventilation and / or 30 via the actual target suction duct 22, for example for cleaning and additional target suction duct and suction or the residual excess heat is released near or above the impurity boundary layer R of the room H.

35

Claims (7)

6 84233 A target ventilation method, wherein the method sucks pollutant air and / or gas and / or superheat air out of the source of contamination of the workstation (18) so as not to spread into the breathing zone of a person working at the workstation, characterized in that the method uses a target ventilation device (10). by means of transferring the impure air and / or gas and / or superheat of the workstation above the living and / or breathing zone of the room to the pollutant layer 10 therein and releasing the pollutant from the target ventilation device (10) using the wherein fresh air is introduced into the room space (arrow Cx) in the living area of the room space and the air is removed from the pollutant air layer from the top of the room (arrow C2) through 15 ducts and / or openings (17), whereby air pollutants are also removed through said duct and / or opening (17). hteestä removed from the air, after it has been released epäpuhtausrajakerroksen (R) and close. Target ventilation method according to Claim 1, characterized in that the pollutant air and / or gas and / or the superheat are transferred from the room space (Hx) to another room space (H2) and transferred in the second room space (H2) close to the room space impurity boundary layer (R). Method according to one of the preceding claims 1 or 2, characterized in that the actual target suction and in addition the additional target suction are used, with which the impurities and / or superheat transferred from the work station are released to the same room (H) as the work station. 1 2 3 4 5 6 Method according to the preceding claim, characterized in that the additional target suction releases minor contaminants transferred from the work station and / or the superheated room 4 (H) equipped with displacement ventilation or the like and the actual target suction releases the contaminants and / or superheat and preferably above the impurity boundary layer. 7 84233 Method according to one of the preceding claims, characterized in that the actual target suction is used and in addition additional target suction and the actual target suction removes the higher impurity concentration and / or superheat from the workstation and transfers said impurity and / or superheat completely out of the room (H) and / or for further processing and additional target suction removes residual impurities and / or superheat from the workstation and releases them near or above the impurity limit layer (R) of the room (H). A target ventilation device comprising a body jacket (11) and having a suction opening (12) through which exhaust air can be directed directly to a source of contamination at a workstation (18) and comprising a suction fan (14) and an exhaust duct (13) connected to the body jacket (11), wherein the device sucks out dirt and / or over-15 heat so that it does not spread to the breathing zone of a person working at the workplace, characterized in that the target ventilation device comprises an exhaust duct (13) adapted to transfer air or gas to a collection zone from which said contaminant is sucked in for further treatment and / or to be discharged and that the target ventilation device comprises an exhaust duct (13) which opens in the vicinity of the contaminant boundary layer (R). Target ventilation device according to the preceding claim, characterized in that the device comprises a diffuser (14) at the end 25 (13 ') of the exhaust duct (13), by means of which the air is evenly distributed so as not to mix the air above the pollutant boundary layer (R) with other room air. 8 84233