Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
  • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
  • F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
  • F24F3/163—Clean air work stations, i.e. selected areas within a space which filtered air is passed
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F9/00—Use of air currents for screening, e.g. air curtains

Definitions

• the invention relates to a method for separating at least two spatial areas and for reducing the transfer of airborne particles between the spatial areas to protect people and / or products from the airborne particles, the person being at least partially in the first spatial area is located and the products in the second, in which at least one flat air jet of purified air is used for the separation
• the invention further relates to devices for performing the method.
• Products in the sense of this application are all objects, intermediate products, intermediate products and end products that are handled, filled, sampled or changed in any way.
• Dispensing booths from Extract Technology Limited, Huddersfield, England Cleaned air is applied to the ceiling of the cabin in the form of a vertical, low-turbulence displacement flow and extracted in the floor area.
• the disadvantage of these devices is that the product can only be handled clearly below the head area of the personnel if the protection of the personnel from the product is to be ensured.
• Another disadvantage is that the product in these devices is not adequately protected from foreign particles caused by humans.
• This principle is used, for example, on the WIBOjekt ® work tables from GWE, Hude.
• the operating staff reaches through a support jet, which is placed in the front area of the work table via an ejector bar and creates an air curtain between the head area of the operator and the product area.
• the extraction system is located in the rear area of the work table.
• the air flow of the support jet is typically 1 to 10 liters per second per meter of cabin width.
• the disadvantage of these devices is the lack of product protection.
• This object is achieved according to the invention by a method of the type mentioned at the outset, which is characterized in that at least one low-turbulence displacement flow near the at least one air jet is generated with cleaned air in at least the second spatial region, the at least one displacement flow in predominantly the same direction is directed like the at least one air jet.
• the invention therefore relates to a method for separating at least two spatial areas and reducing the transfer of airborne particles between the spatial areas to protect people and / or products from the airborne particles, the person being at least partially in the first spatial area Area and the products in the second, where you have to separate at least one flat
• Air jet from cleaned air is used, characterized in that at least one low-turbulence displacement flow near the at least one air jet is generated with cleaned air in at least the second spatial area, the at least one displacement flow being directed in predominantly the same direction as the at least one air jet.
• a “low-turbulence displacement flow” in the sense of the invention is a flow in which a rectified air flow flows over the entire cross-section of a delimited area with a speed that is as uniform as possible and almost parallel flow lines (“laminar flow”).
• laminar flow This definition comes from the guidelines of the Association of German Engineers (VDI) No. 2083 of December 1976, which are hereby incorporated by reference as part of the description.
• the invention further relates to a device for carrying out this method, comprising one or more first means for generating one or more flat air jets, with which, in the intended use, at least one room is separated into at least a first and second spatial area by the or each flat air jet , wherein products can be arranged in the second spatial area, the device in the second spatial area having second means for generating a low-turbulence displacement flow.
• the invention further relates to the devices according to claims 19, 22 and 23. Particular embodiments or refinements are disclosed in the respective subclaims. Individual or several of the features disclosed in the subclaims in combination with the features of the main claims can also be inventive solutions to the problem on which the invention is based, and the features can also be combined as desired.
• a first preferred embodiment of the method according to the invention is characterized in that the displacement flow is guided at least partially at a distance of at most 0 to 50 cm from the at least one air jet.
• a displacement flow with an air velocity of 0.1 to 1.5 m / s, preferably 0.2 to 0.6 m / s, particularly preferably 0.3 to 0.45 m / s, and at least one air jet are generated with an air outlet speed of 2 to 30 m / s, preferably 3 to 10 m / s, particularly preferably 5 to 8 m / s.
• At least the second spatial area may not have zones through which the air flow flows.
• at least one of the spatial areas is sucked off at least the total amount of air of the at least one air jet and the at least one displacement flow. It is also advantageous to angle the or each air jet at a predetermined or selectable or adjustable angle from the range from -45 ° to + 45 °, preferably from -30 ° to _
• Preferred configurations of the device according to the invention for carrying out the method can also be constructed accordingly.
• a preferred embodiment of the device according to the invention is characterized in that the device has one or more suction devices which are dimensioned such that they can suck off at least the total amount of air from the air jets and the displacement flows.
• the or each suction device is preferred over the first means
• the invention also relates to a device for protecting people and / or products from airborne particles, comprising a partially open front side with a height of H [m] for engaging the device, two side walls, a rear wall, one or more means for blowing in filtered air, which are arranged on a side wall, and one or more suction devices, characterized in that the means for blowing in are designed and arranged for the first part in such a way that, from the region of a side wall near the front side, a flat air jet with an overall air output of more than 10 lj .N. per second and height H [m] to separate the interior of the
• the Device can be guided from the surrounding area to the other side wall and to a second part so that on the side of the air jet facing away from the front, a cleaned, low-turbulence displacement flow can be guided from one side wall to the other and that the suction devices at least partially in the area near the front of the
• the device is arranged and dimensioned such that, in its entirety, it can accommodate at least the total amount of air from the air jet and the displacement flow.
• the lateral suction extends over the entire height H [unit meter] of the engagement cross section of the device.
• the air jet predetermined or selectable or adjustable angle in the range from -45 ° to + 45 °, preferably from -30 ° to + 30 °, particularly preferably -15 ° to + 15 °, very particularly preferably from -5 ° to + 5 ° against the front of the displacement flow in relation to the direction of flow.
• a further embodiment is characterized in that the high air output of the support jet is achieved by combining a plurality of ejector strips connected in series, preferably by 2 parallel ejector strips. All ejector systems known to the person skilled in the art, such as e.g. Gap or hole nozzles are used.
• suction takes place through two parallel rows of holes (suction strip) in a side wall on the front boundary (front) of the device.
• Another special embodiment is characterized in that the air jet in a certain, predetermined or selectable or adjustable
• Air jet or a low-turbulence displacement flow with an air speed of 0.1 to 1.5 m / s, preferably 0.2 to 0.6 m / s, particularly preferably 0.3 to 0.45 m / s can be generated.
• a further special embodiment is characterized in that the ejectors are suitable for an air outlet speed of 2 to 30 m / s, preferably 3 to 10 m / s, particularly preferably 5 to 8 m / s.
• a further special embodiment is characterized in that the ejector strips are designed in such a way that, together with them, an air discharge rate of 10 to 300 liters per second per meter height of the part of the front side intended for the intervention, preferably 20 to 100 liters per second per meter height, particularly preferably 40 to 80 liters per second per meter height can be generated.
• This device according to the invention can in particular also be combined with individual or several features from the other configurations.
• the invention further relates to a device for protecting people and / or products from airborne particles, comprising a partially open front with a width of B [m] for engaging the device, a top, a bottom, a rear wall, one or more means for blowing in filtered air, which is arranged on the top, as well as one or more
• Suction devices characterized in that the blowing means for a first part (4, 5) are designed and arranged in such a way that a flat air jet (13) with a total air discharge capacity of more than 10 l i N from the area of the upper side near the front. per second and width B [m] for separating the interior (2) of the device from the surrounding area (1) and down to a second part (3) such that on the side of the air jet (13 ) a cleaned, low-turbulence displacement flow (14) can be guided downward and that the suction devices (6) are at least partially arranged in the area near the front of the device and are dimensioned such that in their entirety they cover at least the total amount of air of the air jet (13) and the Can accommodate displacement flow (14).
• suction on the floor extends over the entire width B [unit meter] of the engagement cross section of the device.
• the air jet and the displacement flow can also be directed against gravity from bottom to top.
• a corresponding device according to claim 23 is also the subject of the invention.
• the low-turbulence displacement flow is at an angle that is from -20 ° to 20 °, preferably from -10 ° to + 10 °, particularly preferably from -5 ° to 5 °
• a further embodiment is characterized in that the high air output of the support jet is achieved by combining a plurality of ejector strips connected in series, preferably by 2 parallel ejector strips. All ejector systems known to the person skilled in the art, such as e.g. Gap or
• Perforated nozzles are used.
• a further special embodiment is characterized in that the suction takes place through two parallel rows of holes (suction strip) in the floor area at the front boundary (front) of the device.
• the air jet is at a specific, predetermined angle in the range from -30 ° to + 30 °, preferably from -20 ° to + 20 °, particularly preferably from -10 ° to + 10 °, very particularly preferably from -5 ° to + 5 ° against the connecting plane between the ejector bar and the suction bar or against the vertical.
• Another special embodiment is characterized in that a low-turbulence displacement flow with an air speed of 0.1 to 1.5 m / s, preferably 0.2 to 0.6 m / s, particularly preferably 0.3 to 0.45 m / s s can be generated.
• a further special embodiment is characterized in that the ejectors are suitable for an air outlet speed of 2 to 30 m / s, preferably 3 to 10 m / s, particularly preferably 5 to 8 m / s.
• Another special embodiment is characterized in that the ejector strips are designed so that together with them an air discharge rate of at least 10 to 300 liters per second per meter width of the part of the front side intended for the intervention, preferably 20 to 100 liters per second per meter width, particularly preferably 40 to 80 liters per second per meter width, which also means areas from other combinations of the limits mentioned should be disclosed.
• an air discharge rate of at least 10 to 300 liters per second per meter width of the part of the front side intended for the intervention, preferably 20 to 100 liters per second per meter width, particularly preferably 40 to 80 liters per second per meter width, which also means areas from other combinations of the limits mentioned should be disclosed.
• the device according to the invention can also be combined as desired with individual or more features from the configurations.
• the invention is based on the surprising effect that the displacement flow stabilizes the flat air jet, so that the protective effect of the combination of the two is much better than expected.
• the front limiting disk of a horizontal flow laminar flow work zone which only allows limited access to the product space, can be replaced by a wide support jet with high air output if the suction is largely on the area of the device near the front is limited, and that both a high level of product protection and a high level of personal protection is then guaranteed despite the removal of the delimitation disk.
• Fig. 1 A schematic representation of the method according to the invention using a schematic device according to the invention in cross section; 2: schematic representation of a device and a method according to example 2; 3: schematic representation of a device and a method according to counterexample 1; Fig, 4a; Schematic representation of a first special embodiment of the
• FIG. 4b cross section of the device from FIG. 4a along the line A-B
• 4c cross section of the device from FIG. 4a along the line C-D
• Fig. 5 Schematic representation of a second special embodiment of the method and the device in lateral cross section.
• a LaminAir ⁇ workbench, type HL 2472, with a protected product area (corresponds to the second spatial area) 2 and surrounding personal area 1 (corresponds to the first spatial area) is equipped on the ceiling with second means for generating a low-turbulence displacement flow 14, in particular with two-layer laminarizers 3, which are sealed up to a workbench-wide 8 mm deep gap on a front pane 25 against the workbench walls.
• the schematically indicated disk 25 of the workbench is raised up to the lower edge of the laminarizers.
• first means 4, 5 for generating a flat air jet 13 are arranged from the outside directly on the raised workbench disk, namely a workbench-wide ejector bar 4 and a gap 5 with an air outlet gap downwards.
• the ejector 4 is equipped with a combination of perforated and split nozzles with an effective cross section of 0.9 mm.
• the resulting gap 5 between laminarizers 3 and the raised disk serves as an 8 mm thick ejector 5
• the bottom of the workbench is sealed except for the suction openings 6 on the open pane.
• the laminarators 3 are operated with an air outlet speed of approximately 0.45 m / s.
• Ejector 4 is operated in the example with an air outlet speed of 5 m / s.
• Ejector 5 is operated in the example with an air outlet speed of 7 m / s.
• the air distribution in the workbench is shown schematically in FIG.
• the protection factor is defined as the quotient of the dust content between the "raw” and "clean side” when a dust source is removed from the raw side.
• the clean side is the center of the workbench 5 cm in front of the workbench opening (personal area 1)
• the raw side is the inside of the workbench behind the suction (product area 2).
• product area 2 For the consideration of product protection, the raw and clean side are swapped accordingly.
• the protection factor for personal protection when the workbench is idle is 400,000 without operator intervention. With simulated work movements, i.e. when reaching in and out, as well as other movements of both arms in the cabin, a value of 750 for personal protection is achieved.
• the protection factor for product protection when the workbench is idle is 160 million without operator intervention. With simulated work movements, i.e. when reaching in and out, as well as other movements of both arms in the cabin, a value of 6,000 is achieved for product protection.
• a workbench is converted and operated as in Example 1. In contrast to Example 1, however, the gap between laminarizers 3 and the raised window is sealed, so that no air escapes from ejector 5.
• Ejector 4 is operated as in Example 1 with an air outlet speed of 5 m / s.
• the flat The air jet therefore has an air output of 6.3 r, .N. per second and meter width of the air jet.
• the air distribution in the workbench is shown schematically in cross section in FIG. 2 shown below.
• the protection factor for personal protection is now when the workbench is idle, i.e. without operator intervention 300. With simulated
• the protection factor for product protection is now when the workbench is idle, i.e. 50 million without operator intervention.
• a workbench is converted and operated as in Example 1. In contrast to
• Example 1 however, the gap between laminarizers 3 and the raised window is sealed, so that no air escapes from ejector 5. In addition, ejector 4 is not operated, so that no air escapes from it.
• the air distribution in the workbench is shown schematically in cross section in FIG. 3.
• the protection factor for personal protection is now the idle state
• the protection factor for product protection is now 6000 when the workbench is idle, ie without operator intervention. With simulated work movements, ie when reaching in and out, and other movements of both arms in the cabin, a value of 30 is achieved for product protection.
• a device for combined product and personal protection is constructed from an air application element 19 and an air suction element 20, as shown schematically in FIGS. 4a and 4b. Both elements are in a room (not shown) with a separate clean air supply system and an exhaust air system with an integrated one
• Air purification (not shown).
• the open and at the same time protected product area 2, in which dusting product can be handled openly, is located between the air supply element 19 and the air suction element 20, as shown in FIG. 4c.
• the protected personal area 1 is located in the entire spatial area which surrounds the protected product area 2.
• the air supply element 19 consists essentially of an air supply pipe 7, into which cleaned air from the supply air system is guided, a distributor 8, an air supply segment 22 angled obliquely downwards and a stand segment 9.
• the air supply segment 22 supplies the supply air supplied via the distributor one via a rectangular laminarizer 10 and the other via four ejector bars
• the air velocity of the air fed in with the laminarizer 10 is 0.45 m / s in the example.
• the air outlet speed from the ejector bars is 5 m / s in the example.
• the resulting air distribution at the air application element 19 is also shown schematically in FIGS. 4a and 4c.
• the air suction element 20 has two suction strips 12, via which 1.4 times the amount of air supplied with the air application element can be extracted and fed to the exhaust air system.
• a mobile device for the combined protection of persons and products 26 is shown schematically in cross section in FIG. 5.
• the device has a protected product area 2 that is open both laterally and in the upper front area.
• the protected person area 1 is formed by the surroundings of the device. Lateral openings can be used to supply the Product area with product containers are used, whereas the front opening of the person shown allows free access for the protected handling of product 26.
• the front ceiling area of the device there are two parallel ejector strips, via which a flat air jet 13 can be applied at an angle to the vertical front of the device of approximately 10 ° downwards. Behind it, there are laminarizers in the ceiling area, which can form a low-turbulence displacement flow 14 downwards.
• the air supplied is detected in the front area of the device via an exhaust air duct 18 provided with suction openings at the top and on the other hand in the lower rear area of the product space at the bottom of the device and fed to a filter 16 via a fan 15. Part of the cleaned air flowing out of the filter serves as supply air for the laminarizer and the ejector strips and is partly discharged as exhaust air 17.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Ventilation (AREA)
• Nozzles (AREA)
• Jet Pumps And Other Pumps (AREA)
• Central Air Conditioning (AREA)
• Delivering By Means Of Belts And Rollers (AREA)
• Separation Of Gases By Adsorption (AREA)
• Respiratory Apparatuses And Protective Means (AREA)

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• 1999
  • 1999-09-01 BR BR9913741-0A patent/BR9913741A/pt not_active IP Right Cessation
  • 1999-09-01 MX MXPA01002689A patent/MXPA01002689A/es not_active IP Right Cessation
  • 1999-09-01 CN CNB998108960A patent/CN1198090C/zh not_active Expired - Fee Related
  • 1999-09-01 WO PCT/EP1999/006418 patent/WO2000016017A1/de not_active Application Discontinuation
  • 1999-09-01 JP JP2000570509A patent/JP2002525545A/ja active Pending
  • 1999-09-01 EP EP99944574A patent/EP1114282A1/de not_active Ceased
  • 1999-09-01 HU HU0103486A patent/HU226145B1/hu not_active IP Right Cessation
  • 1999-09-01 PL PL99346624A patent/PL195743B1/pl not_active IP Right Cessation
  • 1999-09-01 CA CA002344066A patent/CA2344066C/en not_active Expired - Fee Related
  • 1999-09-01 KR KR1020017003290A patent/KR100709495B1/ko not_active IP Right Cessation
  • 1999-09-13 TW TW088115875A patent/TW399138B/zh not_active IP Right Cessation
  • 1999-09-13 AR ARP990104590A patent/AR021802A1/es active IP Right Grant
• 2002
  • 2002-03-01 HK HK02101579.5A patent/HK1040107B/zh not_active IP Right Cessation

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