FOCUSSED VENTILATION PROCEDURE AND FOCUSSED VENTILATION MEANS

Abstract: The present invention concerns a focussed ventilation procedure. In the procedure, impure air and/or gas, and/or excess heat is/are drawn off from the source of impurities of the work spot (18) so as not to enter the respiratory zone of the person working in the work spot. The impure air and/or gas, and/or excess heat is/are moved into the collection zone of the impure air and/or gas, and/or excess heat located in the room space, wherefrom said impure air and/or gas, and/or excess heat is/are drawn to be treated further and/or conducted off, and/or wherefrom it is/they are mixed with the rest of the air of the room space (H) for diluting said impurities and/or excessively hot air. The invention also concerns a focussed ventilation means.

Description: -| Focussed ventilation procedure and focussed ventilation means c The present invention concerns a focussed ventilation procedure and a focussed ventilation means. Focussed ventilation procedures of air impurities are known in the art in which separate suction is focussed directly on a work spot- Q specific source of impurities. The air of the impurities is thus treated further and drawn either into purification and/or heat recovery. Therefore, the impurities of the work spot have been ar¬ ranged to be moved into a separate treatment. The aim of the invention is a focussed ventilation procedure of a novel kind in which the air containing impurities is arranged to be moved off from the work spot so that it will not enter the respiratory zone of the person working in said work spot. As taught by the invention, the impure air of the work spot is moved off with a means comprising a blower or equivalent generating air flow, whereby the air or gas containing impurities, or the excess heat of said work spot is drawn off from the work spot by means of suction provided by the blower, and in which means the air or gas is removed from the adjacency of the means, being either treated or untreated. As taught by the invention, the impure air is moved with a focussed ventilation means into a collection zone, e.g. to the adjacency of the impurity limit in the adjacency of the ceiling of the room space, and/or is mixed with the room air in order to be diluted. In another advantageous embodiment of the invention the air is moved with a focussed ventilation means directly into another room space. The room ventilation means of the invention is mainly characterized in that in the procedure impure air and/or gas, and/or excess heat is/are drawn off from the source of impurities of the work spot in 1 that it will not spread into the respiratory zone of the person working in said work spot, and the impure air and/or gas, and/or ex¬ cess heat is/are moved to a collection zone of the impure air and/or gas, and/or excess heat located in said room space, from which zone 5 said impure air and/or gas, and/or excess heat is/are drawn to be further treated and/or lead away, and/or from where it is mixed with the rest of the air of the room space for diluting the impurities and/or the excess heat. -|Q The focussed ventilation means of the invention is mainly character¬ ized in that the focussed ventilation means comprises a body envelope and a suction aperture therein, wherethrough the vented suction can be focussed directly on the source of impurities of the work spot, and which means comprises a blower which provides suction, an outlet ■|5 duct connected to the body envelope, whereby impurities and/or excess heat are drawn with the means so that it/they will not spread into the respiratory zone of the person working at said work spot, and whereby the impure air and/or gas, and or excess heat is/are trans- mited into a collection zone of impurities, from which said impurities 20 are drawn to be treated further and/or conducted off and/or from where it is/they are diluted into the room space. The invention is described in the following referring to certain advantageous embodiments of the invention presented in the figures 5 of the drawing attached, but to which the invention is not intended to be exclusively confined. Fig. 1 presents schematically a first advantageous embodiment of the procedure of the invention. 0 Fig. 2 presents a second advantageous embodiment of the procedure of the invention. Fig. 3 presents the focussed ventilation, means used in the procedure 5 °f tl 16 invention. Fig. 4 presents schematically a third advantageous embodiment of the 1 procedure of the invention. Fig. 5 presents an embodiment of the procedure and the apparatus of the invention in which air is carried into the work spot and air from the work spot is removed from said work spot, and it is dis¬ charged into the same room space. In Fig. 1 is presented a first advantageous embodiment of the proce¬ dure of the invention. A room space H comprises a focussed ventilation ■JO means 10 at a work spot 18. The wide suction surface of a suction aperture 12 of the focussed ventilation means 10 has been disposed above a working table 19 located in the work spot 18, positioned above e.g. a soldering site of circuit boards in said work spot. The suction aperture 12 of the body envelope 11 of the focussed venti- ■|5 lation means 10 is positioned in front of the person working at said working spot so that from the work spot the impurities move directly into the suction aperture 12 of the body envelope of the focussed ventilation means 10 through the perforation 12a of a perforated plate or equivalent of the focussed ventilation means 10. In the 0 procedure of the invention, the focussed ventilation means 10 com¬ prises an outlet duct 13 connected to the body 11, being rigidly joined to said body 11, and said outlet duct 13 supporting itself. A blower 14 has been disposed either directly into the outlet duct 13 or into the body envelope 11. 5 The embodiment shown in Fig. 1 concerns a displacement ventilation, and fresh air is drawn into the room H into the respiratory zone and advantageously, from the adjacency of the floor L in the lower part of the room space through incoming ducts 16a and/or 16b as shown by 0 arrows C ] _. In displacement ventilation, the impurities of the air are not mixed with the room air but they have been transmitted into the adjacency of the ceiling K of the room H and provide a layer of impure air therein. With the means 10 of the invention the air con¬ taining impurities of the work spot is carried with an air flow pro- 5 duced by the blower 10 directly into the adjacency of the impurity limit layer R. At the end of the outlet duct 13 of the focussed ventilation means 10 is positioned a disperser 15, the function 1 thereof being to distribute the air uniformly with a small impulse into the adjacency of the impurity limit layer, advantageously there- above. The aim is that it will not mix the impure air above the limit layer R to below the limit layer R. Therefore, the function of 5 the disperser is to distribute the air with a small impulse into a wide area above the limit layer R, or slightly below said limit layer wherefrom it moves above said limit layer. Furthermore, the air of the work spot containing impurities and/or excess heat is removed from the room space H out through the duct 17 and/or to be ■JO purified and/or to heat recovery. The duct 17 has been disposed to be located in the adjacency of the ceiling K of the room space H. The air to be removed from the room is indicated by arrow C2. In Fig. 2 is presented a second advantageous embodiment of the 1 * 5 procedure of the invention. In the procedure of the invention, the focussed ventilation means 10 has been disposed to move the air of the work spot 18 containing impurities directly from the room space H_ into the collection point of impurities, being, as shown in the figure, located in another room space H£. If displacement ventilation 20 is used in the room space H2, that is, resh air is drawn into the lower part of the room space through a duct 16, and air is removed from the upper part of the room space H through a duct 17, the impure air or gas of the work spot of the room space H^ can be moved, as shown by arrow L2, directly into the adjacency of the impurity 5 limit layer R of the room space H2, and advantageously above the limit layer R. Such an embodiment is also feasible within the scope of the invention in which with the means 10 of the invention the air of the room 0 space H^ is removed into another room containing mixing ventilation. In Fig. 3 is presented a third advantageous embodiment of the focussed ventilation means of the invention. The focussed ventilation means 10 comprises a body envelope 11 provided with a suction aperture 12 5 which is focussable on the target of impurities. The suction aperture 12 comprises a perforated plate 12' provided with a plurality of slats and/or holes 12a and/or slots or equivalent through which the 1 air is drawn. The apparatus comprises an outlet duct 13, advan¬ tageously a pipe made of rigid metal, coupled directly to the body envelope 11. A blower 14 generating suction has been disposed into the pipe 13. 5 Also such embodiment of the means of the invention is feasible in which the blower 14 is located directly inside the body envelope 11. As shown in Fig. 3, the upper end 3' of the outlet duct 13 has been ■|0 disposed to be located in the adjacency of the impurity limit layer R of the room space. As shown in Fig. 3, the end 13' of the outlet duct 13 is located above the limit layer R. The means is provided with a disperser 15 shown in Fig. 3, its function being to distribute air uniformly by using a small impulse, into as wide area as possible •|5 in the impurity layer in the upper part of the room space so that said impure air will not be mixed with the rest of the air of the room space. The outlet duct 13 supports itself, though such an embodiment is 0 also feasible in which the outlet duct 13 has been supported with separate support systems. The disperser 15 is in one of the advantageous embodiments of the invention made of a bag of an elastic material provided with per- 5 foration 15' . Through the perforation 15' air is discharged from the end 13' of the pipe 13. In Fig. 4 is presented a third advantageous embodiment of the proce¬ dure of the invention. As shown in Fig. 4, the room space H has been 0 provided with displacement air, that is, air is drawn into the room space advantageously into the lower part of the room space through a duct 16, and impure air of the room space H is removed through a duct 17 from the upper part of the room space, from above the impurity limit layer R. Air transmission into the room space is indicated by 5 arrow C^ and air removal from the room space H is indicated by arrow C2. The entry of the air into the room space has been arranged to take place with a blower of its own, respectively the discharge of the 1 impure air from said room space has been arranged to take place advantageously by the aid of suction provided with the blower. In the procedure presented in Fig. 4, the actual focussed suction is focussed on the impure air or impure gas of the work spot, or at the 5 excess heat of said work spot through the actual focussed suction duct 20 with the aid of the blower 21 positioned in the duct 20. Through said duct, majority of the impurities are removed. With the aid of an additional focussed suction, this being provided e.g. with a means like the one presented in Fig. 3, the residual impurities of -JO the work spot are removed. In the procedure presented in Fig. 4, the impurities and/or excess heat moved off by means of additional suc¬ tion and actual focussed suction from the work spot are discharged into the same room space H in which the work spot is located. •J5 In the advantageous embodiment of the invention presented in Fig. 4 the impurities and/or excess heat of the work spot are moved and discharged by means of additional focussed suction through the duct 13 in the room H or equivalent provided with displacement ventilation to pass below the impurity limit layer R of the room space H, and 20 the. impurities and/or excess heat removed from the work spot through the duct 20 with the actual focussed suction are discharged into the adjacency of the impurity limit layer R of the room space and advan¬ tageously, above the impurity limit layer. 25 In Fig. 4 is presented an embodiment of the invention with a broken line in which the impurities and/or excess heat are transferred through the duct 22 of the actual focussed suction off from the room space H provided with displacement ventilation and/or said impurities and/or excess heat are transferred further into treatment, for 0 instance into purification, and the residual impurities and/or residual excess heat of the work spot drawn through the duct 13 of the additional focussed suction are discharged into the adjacency of the impurity limit layer R of the room space, or thereabove. 5 Fig. 5 presents in principle an embodiment of the procedure and the apparatus of the invention in which air is carried into the room space H, or respectively, as shown by arrow C^, through the duct 16, advantageously from the lower part of the room space H, and air is removed from the room space H, from above the impurity limit layer R, through a duct 17, as shown by arrow C2. In the room space is located a work spot T. In the figure is depicted a person working at the work spot T. The apparatus comprises an incoming air means, comprising a duct 23 opening into said room space, a blower 25 positioned in the duct 23 with which the air of the room space H is blown and flown from the room space into the duct 23, as shown by arrow L3, and furthermore into the incoming air terminal member 24 connected to the duct 23. As shown by arrow L4, the air is discharged from the terminal member 24 so that it is focussed on the source of impurity E of the work spot. The incoming air L directs impure air and/or excess heat of the focussed ventilation means towards the focussed suction 12 of the focussed ventilation means 10. The focussed ventilation means 10 may be similar to the one presented in Fig. 3. The means 10 comprises a body 11, a suction aperture 12, a duct 13 and a blower 14 therein. The duct 13 terminates in the room space H and it terminates in the adjacency of the limit layer R, advan¬ tageously thereabove. The discharging air of the room space H is in Fig. 5 indicated by arrow L5. Therefore, in the embodiment of Fig. 5 the air of the room space H is flown with the air flow generated by the blower 25 through the duct 23 into a terminal member 24, and furthermore, through the impurity source of the work spot into the discharge together with the impure air and/or excess heat. Through the means 10, said air is flown further back into the same room space and so that said impure air is discharged into the upper part of the room space, into the adjacency of the limit layer therein, or thereabove.

Claims: 1 Claims 1. A focussed ventilation procedure, characterized in that in the procedure impure air and/or gas, and/or excess heat is/are drawn off from the source of impurities of a work spot (18) so that it will not enter the respiratory zone of the person working at said work spot, and the impure air and/or gas, and/or excess heat is/are moved into the collection zone of the impure air and/or gas, and/or excess heat located in said room space from which said impure air and/or -JO gas and/or excess heat is/are drawn to be treated further and/or conducted off and/or from where it is mixed with the air present in said room space (H) for diluting the impurities and/or excessively hot air. ■ |5 2. Focussed ventilation procedure according to claim 1, characterized in that in the procedure is used a focussed ventilation means (10) by the aid of which the impure air and/or gas and/or excess heat is/are moved to be located above the staying zone and/or the respiratory zone of a work space of said room space, and/or into the 20 adjacency of the impurity limit layer (R) of the room space. 3. Focussed ventilation procedure according to claim 1 or 2, charac¬ terized in that in the procedure the impure air and/or gas and/or excess heat or the work spot is/are moved from a room space (H j _) 25 into another room space (H2) . 4. Focussed ventilation procedure according to the preceding claim, characterized in that in the procedure the impure air and/or gas and/or excess heat is/are moved into the adjacency of the impurity 0 limit layer (R) of the room space of another room space (H2) . 5. Focussed ventilation procedure according to any one of the preceding claims 1-4, characterized in that the impure air and/or gas and/or excess heat of a room space or equivalent is/are moved 5 into the adjacency of the impurity limit layer (R) in a room in which fresh air is moved (arrow C^) into the staying zone of the room space and the air is removed from the impurity layer located in the upper part of said room (arrow C2) through a duct and/or an aperture (17) . 6. Focussed ventilation procedure according to any one of the preceding claims 1-5, characterized in that the actual focussed suction and, in addition, an additional focussed suction are used with which the impurities and/ or excess heat moved from the work spot are discharged into the same room space (H) where the work spot is located. 7. Procedure according to the preceding claim, characterized in that with the additional focussed suction the impurities and/or excess heat of the work spot are moved below the impurity limit layer of the room (H) provided with displacement ventilation, or equivalent, and the impurities and/or excess heat removed with the actual focussed suction from the work spot are discharged into the adjacency of the impurity limit layer and advantageously, above the impurity limit layer. 8- Procedure according to any one of the preceding claims 1-5, characterized in that the actual focussed suction and moreover, an additional focussed suction is used, and by means of the actual focussed suction, the higher impurity content and/or excess heat is/are removed from the work spot, and said impurity and/or excess heat being completely moved off from the room space (H) , and/or to be treated further, and by means of the additional focussed suction, the residual impurities and/or excess heat of the work spot are removed and they are discharged into the adjacency of the impurity limit layer (R) of the room space (H) or above said impurity limit layer (R) . 9. Procedure according to claim 1, characterized in that in the procedure at least one incoming air means (25,23,24) is used through which the air of the room space (H) is flown and focussed through the respiratory zone of the person working in a work spot on the source of impurity and/or excess heat of the work spot, and that in the procedure, with the aid of the air flow (L4) flowing through the 1 incoming air means the impure and/or excess heat of the source of impurity (E) of the work spot is/are focussed on the suction aperture (12) of the focussed ventilation means (10) through which suction aperture the impure air and/or excess heat is/are drawn by means of suction provided by the blower (14) into a duct (13) , and said impure air and/or excess heat is discharged into the same room space (H) . 10. Procedure according to claim 9, characterized in that in the procedure fresh air is carried into the room space (H) to below the ■ JO impurity limit layer (R) of the room space, and from the room space impure air is removed from the upper part of the room space, from above the impurity limit layer (R) , and that in the procedure the im¬ pure air flown through the duct (13) is discharged into the adjacency of the impurity limit layer (R) of the room space, or thereabove. 15 11. A focussed ventilation means, characterized in that the focussed ventilation means comprises a body envelope (11) and a suction aperture (12) therein, wherethrough the discharge suction can be focussed directly on the source of impurities, said means comprising 0 a blower (14) to provide suction, a discharge duct (13) connected to the body envelope (11) , whereby with the means impurities and/or excess heat are drawn off so that it/they will not enter the respiratory zone of the person working in the work spot, and whereby the impure air and/or gas and/or excess heat is/are moved into the 5 collection zone of impurities, wherefrom said impurities are drawn off to be treated further, and/or conducted off. 12. Focussed ventilation means according to the preceding claim, characterized in that the means comprises a disperser (14) unit on 0 the end (13') of the discharge duct (13), with the aid of which the air is distributed uniformly so that it will not mix the impure air above the impurity limit layer (R) with the air of the rest of the room space. 5

Inventors: AALTO ERKKI, ELORANTA JOUKO, PELLINEN TEUVO, AALTO, ERKKI, ELORANTA, JOUKO, PELLINEN, TEUVO
Applicants: HALTON OY
Application year: 1989
Main classification: B08B15
IPC codes: B08B15