• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to an apparatus and a method for venting a clean room working area with clean air. Furthermore, the invention relates to a workplace arrangement with the device. The device has an inlet region (10), an exhaust air opening (5), a blower (7) and a hood filter (9). From the inlet region (10), a first partial flow of clean air is introduced into the clean room working area (3). Through the exhaust port (5) through a second partial flow of clean air is completely discharged into the environment (4). It is essential to the invention that the hood filter (9) is set up to filter the air provided by the blower (7) for both partial flows of clean air. In this case, the exhaust air opening (5) is connected on the output side of the hood filter (9) to the lead-in area (10). As a result, it is possible to dispense with a separate exhaust air filter for the air to be discharged through the exhaust air opening (5) into the environment (4).
    公开号:CH713874A2
    申请号:CH00597/18
    申请日:2018-05-14
    公开日:2018-12-14
    发明作者:Meierose Nils
    申请人:Weiss Pharmatechnik GmbH；
    IPC主号:
    专利说明:

    Description: The invention relates to an apparatus and a method for ventilating a clean room working area with clean air. Furthermore, the invention relates to a workstation arrangement with the clean room working area and with the device according to the invention. The clean room work area is either firmly separated from the environment or partially fixed and partially separated from the environment by an air curtain. The air curtain is a generally substantially vertically from top to bottom directed air flow, which counteracts leakage of hazardous substances from the clean room working area. In the clean room work area, however, there is also a vertical air flow, which is designed in particular as a laminar air flow. Suspended hazardous substances are thereby directed downwards, where air is sucked out of the clean room working area by means of a blower. The extracted air also contains some air from the environment of the clean room working area, which is sucked in with. From the blower, the majority of the sucked air is discharged through a arranged above the clean room working area lead-in area in the clean room working area. A small portion of the intake air, however, is discharged through an exhaust port to the environment. This is necessary in order to extract more and more air from the clean room working area than to blow it in and thus counteract the escape of contaminated air from the clean room working area.
    Both the air discharged through the lead-in area into the clean room working area and the air discharged through the exhaust opening into the environment is clean air which has previously passed through a filter. For example, the air must pass through a hood filter on its way from the fan into the inlet area. Such a generic device is known from DE 19 620 252 A1. In this known device, an exhaust air filter is additionally provided, through which the air flowing to the exhaust air opening must flow.
    Such workplace arrangements are used for example in pharmacy and must meet certain requirements for the purity of the discharged into the clean room working area and especially in the environment of clean air. After a filter change, the workplace arrangement must therefore be qualified in a complex manner before re-commissioning with hazardous substances is possible. For this purpose, a trial operation is driven, in which the filter effect is determined by measurement. Each filter change is laborious and expensive.
    The invention has set itself the task of providing a generic workplace arrangement, which can be operated with lower operating costs.
    The invention solves this problem with a device according to claim 1, with a workstation arrangement according to claim 8 and with a method according to claim 9. Advantageous embodiments of the invention are specified in the dependent claims.
    In a device for ventilating a clean room working area with clean air, with at least one lead-in area from which a first partial flow of clean air can be introduced into the clean room working area, with at least one exhaust opening for draining a second partial flow of clean air through the exhaust opening completely into the environment, with at least one fan for extracting air from the clean room working area and for providing this extracted air for the formation of the partial streams of clean air and with at least one output side of the fan and input side of the lead-in hood filter arranged to filter the fan for at least the first Partial flow of air provided by clean air, is provided according to the invention, that the hood filter is adapted to filter the air provided by the fan for both partial flows of clean air, wherein the exhaust port on the output side of the hood filaments rs is connected to the lead-in area.
    In a method for ventilating a clean room working area with clean air, in particular by means of the device according to the invention, from a lead-in area a first partial stream of clean air is introduced into the clean room working area, wherein a second partial flow of clean air through the exhaust air opening completely into the Environment is derived, wherein a fan sucks air from the clean room working area and the extracted air for the formation of the partial flows of clean air and provides an output side of the fan and the input side of the lead-in hood filter arranged filters the air provided by the fan for at least the first partial flow of clean air According to the invention, it is provided that the hood filter filters the air provided by the fan for both partial flows of clean air and that the second partial stream of clean air is forwarded out of the inlet region to the exhaust air opening.
    The invention directs not only the air, which is intended to be introduced into the clean room working area, but also the air which is to be discharged through the exhaust port into the environment, through the hood filter, wherein the air leaves the hood filter as clean air. This makes the invention without the usual in the art additional exhaust filter. Thus, it is no longer necessary to replace the hood filter and a separate exhaust air filter otherwise customary in the prior art, but only the hood filter at specific time intervals. This reduces downtime of the workstation assembly with the device. In particular, therefore, no separate exhaust filter after installation in the workplace arrangement must be qualified, so be checked in elaborate measurement method then whether he reliably achieved the required filtering effect. This saves costs.
    The inventive workstation arrangement has a permanently separated from the environment or partially fixed and partially separated by an air curtain from the environment clean room working area and the inventive device for venting the clean room working area.
    In particular, for complete guidance of the air provided by the fan through the hood filter, the fan output side connected exclusively luftableitend with the hood filter. The air provided by the fan is thus completely passed through the hood filter and not usual as in the prior art, partially diverted and passed through a separate exhaust filter to the exhaust port. The division into two partial flows takes place in the prior art output side of the fan and before passing through the filter. By contrast, in the invention, the air is completely filtered in the hood filter and the air filtered by the hood filter is provided in a total flow of clean air. The total flow of clean air is divided in particular exclusively into the first partial flow of clean air and the second partial flow of clean air.
    Particularly preferred in the invention, a redundant filtering of the air is provided. For this purpose, the device has a rear wall filter arranged on the input side of the fan, through which the fan can suck the air sucked out of the clean room working area. The air sucked out of the clean-room working area is composed of clean air which has flowed through the introduction region into the clean-room working region and of air from the environment which is sucked in from the environment, in particular in the bottom region of the clean-room working region. This ensures that air with potentially hazardous particles or gases is reliably extracted. A user is protected from substances in the clean room work area and products in the cleanroom work area are protected from contamination from the environment.
    The device preferably has at least one layer of gauze arranged between the introduction region and the clean-room working region. Through the gauze, clean air from the first partial flow can flow from the inlet region into the cleanroom working region. The second partial stream of clean air is discharged between the hood filter and the layer of gauze in the direction of the exhaust opening.
    The layer of gauze ensures uniform distribution of the clean air into the clean-room working area over the area, so that a substantially laminar flow, which is directed substantially vertically from top to bottom, can form in the clean-room working area. For the formation of a most laminar flow, it is important to adjust the amount of clean air, which is introduced per unit time in the clean room working area, to the amount of air which is sucked out of the clean room working area per unit time. It can also be provided to change the flow velocity in the clean room working area as a whole. For this purpose, the air pressure in the lead-in area can be adjusted, since a comparatively higher air pressure leads to comparatively more clean air per unit time being introduced into the clean-room working area. According to a preferred embodiment, the device according to the invention has means for regulating the first partial flow flowing into the clean room working area by changing the air pressure in the inlet region as a function of a measured air pressure. Furthermore, the device in this case has means for measuring the output side of the hood filter prevailing air pressure of the clean air.
    To change the air pressure in the lead-in area various measures are conceivable, of which, however, two alternatively or cumulatively applicable measures are particularly preferred. A first measure is that the device for changing the air pressure in the lead-in region has a variable air guide of the second partial flow. If, for example, less clean air per unit of time is diverted to the exhaust air opening, the air pressure in the inlet region increases, so that subsequently correspondingly more clean air per unit time is introduced into the clean room working area. In a second measure, which is used in particular for changing the flow velocity in the clean room working area as a whole, it is provided that the device for changing the air pressure in the inlet region has a variable blower output of the blower. The blower power of the blower is thus reduced, for example, when less clean air is to be introduced into the clean air working area, wherein changing the blower power also causes the amount of air extracted per unit time from the clean room working area changed.
    Preferably, the device comprises a throttle device, by means of which the second partial flow can be throttled to change the air pressure in the lead-in, wherein the throttle means an adjustable, but otherwise static throttle element and / or a spring-mounted movable throttle element and / or a motor-adjustable throttle element having. The throttle elements control or regulate the air flow of the second partial flow. With the spring-mounted movable throttle element and the motorized throttle element is an automatic control of the second air flow and thereby also the first air flow possible.
    According to an advantageous embodiment, the device provides a gap with an adjustable gap width ready for guiding the second partial flow through this gap. By adjusting the gap width, the flow rate of the second partial flow can be adjusted. As a result, the ratio of clean air in the second partial flow to clean air in the first partial flow changes.
    In particular, the device has a gap on the one hand with its inner surface-limiting U-profile and the gap on the other hand, limiting edge. To adjust the gap width while the distance between the U-profile and the edge, in particular by means of a threaded adjusting screw, changeable. For automatic regulation of the air pressure of the clean air on the output side of the hood filter, however, a motor Einsteilbarkeit the gap width is preferably provided.
    Advantageously, the exhaust port is covered with a layer of gauze, through which the second partial flow of clean air into the environment of the device can be derived. The layer of gauze ensures a uniform and draft-free air outlet at the exhaust air opening. At the same time penetration of contaminants through the exhaust port in the lead-in area is counteracted even when ventilation is switched off.
    Further embodiments will become apparent from the claims, from the accompanying drawings and from the following description of an embodiment of the invention shown in the drawing.
    In the drawing, the sole figure (Fig. 1) shows a workplace arrangement 1 with a device 2 for venting a clean room space working area 3 with clean air according to an embodiment of the invention in a simplified side sectional view. The workplace arrangement 1 is used, for example, in pharmacy, in order to handle substances within the clean room working area 3 which are not intended to reach the environment 4 of the workplace arrangement 1 from the clean room working area 3. Air is therefore discharged from the device 2 after filtering as clean air through an exhaust port 5 into the environment 4. The exhaust port 5 is covered with a layer of gauze 6, through which the clean air can pass flat. The clean air is provided by air from a fan 7 is sucked through a rear wall filter 8 and subsequently completely flows through a hood filter 9. The hood filter 9 opens into an inlet region 10 which is separated from the clean room working area 3 by means of a layer of gauze 11. Further, in the region of the layer of gauze 11, a passage 12 is arranged in the form of a nozzle, through which clean air with a comparatively higher flow velocity prevails as an average in the clean-room working area 3 in order to provide an air curtain 13.
    In the lower region of the clean room working area 3, in addition to the air from the clean room working area, air from the environment 4 is sucked in, so that the air curtain 13 reliably provides a barrier against the escape of particles from the clean room working area 3 through the air curtain 13 into the environment 4 as well as against penetration of particles from the environment 4 through the air curtain 13 into the clean room working area 3 provides. Supportive and as protection of an operator, a protective disc, not shown in the drawing is preferably provided, which is arranged for example displaceable perpendicular to the cutting plane and hanging in front of the air curtain 13.
    The majority of clean air from the lead-in area 10 passes through the layer gauze 11 and the passage 12 as a first partial flow in the clean room working area 3. The remaining part of the clean air from the lead-in 10 is a second partial flow through a gap 14 and on through the exhaust port 5 is directed into the environment 4. The gap 14 has an adjustable gap width in order to adjust the air flow ratios between the second partial flow and the first partial flow can. The gap is given in the embodiment shown by the distance between an edge 15 and the inside of a U-profile 16, the distance to the edge 15 by means of a threaded adjusting screw 17 can be adjusted.
    Various alternative embodiments of the gap 14 are conceivable. Optionally and in deviation from the illustration in the drawing, an automatic regulation of the gap width of the gap 14 is provided in particular as a function of a measured air pressure in the lead-in region 10. For this purpose, the device 2 additionally comprises means for measuring the air pressure of the clean air prevailing on the outlet side of the hood filter and means for regulating the first partial flow flowing into the cleanroom working region 3 by changing the air pressure in the inlet region 10.
    All features mentioned in the preceding description and in the claims can be combined in any selection with the features of the independent claims. The disclosure of the invention is thus not limited to the described or claimed feature combinations. Rather, all in the context of the invention meaningful combinations of features are to be regarded as disclosed.
    权利要求:
    Claims (15)
    [1]
    claims
    1. A device for ventilating a clean room working area (3) with clean air, with at least one lead-in area (10) from which a first partial flow of clean air can be introduced into the clean room working area (3), with at least one exhaust opening (5) for discharging a second Partial flow of clean air through the exhaust port (5) completely into the environment (4) of the device, with at least one fan (7) for sucking air out of the clean room working area (3) and for providing this extracted air for the formation of the partial streams of Clean air and with at least one outlet side of the fan (7) and the inlet side of the lead-in (10) arranged hood filter (9) for filtering the fan (7) at least for the first partial flow of clean air provided air, characterized in that the hood filter (9) for filtering the air provided by the fan (7) for both partial flows of clean air, wherein the exhaust port (5) is connected on the output side of the hood filter (9) to the lead-in area (10).
    [2]
    2. Apparatus according to claim 1, characterized in that the device (2) has an input side of the fan (7) arranged rear wall filter (8) through which the fan (7) sucked out of the clean room working area (3) sucked air.
    [3]
    3. Device according to one of claims 1 and 2, characterized in that the device (2) has at least one between the inlet region (10) and the clean room working area (3) arranged layer of gauze (11) through which clean air from the first partial flow from the lead-in area (10) into the clean room working area (3) can flow.
    [4]
    4. Device according to one of the preceding claims, characterized in that the device (2) comprises means for measuring the output side of the hood filter (9) prevailing air pressure of the clean air and means for controlling the in the clean room working area (3) flowing first partial stream by changing the Air pressure in the inlet region (10) in dependence on the measured air pressure.
    [5]
    5. Device according to one of the preceding claims, characterized in that the device (2) comprises a throttle device, by means of which the second partial flow for varying the air pressure in the lead-in region (10) can be throttled, wherein the throttle device comprises: a) an adjustable, but otherwise static throttle element and / or b) a spring-mounted movable throttle element and / or c) a motor-adjustable throttle element.
    [6]
    6. Device according to one of the preceding claims, characterized in that the device (2) provides a gap (14) with an adjustable gap width for guiding the second partial flow through this gap (14) therethrough.
    [7]
    7. Device according to one of the preceding claims, characterized in that the exhaust port (5) is covered with a layer of gauze (6), through which the second partial flow of clean air into the environment (4) can be derived.
    [8]
    8. Workplace arrangement with a permanently separated from the environment or partially fixed and partially by an air curtain (13) from the environment (4) separated clean room working area (3) and with a device (2) for venting the clean room working area (3) according to one of the claims 1 to 7.
    [9]
    9. A method for ventilating a clean room working area (3) with clean air, in particular by means of a device (2) according to one of claims 1 to 7, wherein from a lead-in area (10) out a first partial flow of clean air in the clean room working area (3) is initiated wherein through a vent opening (5) through a second partial flow of clean air is completely discharged into the environment (4), wherein a fan (7) sucks air out of the clean room working area (3) and provides the extracted air for the formation of the partial flows of clean air and wherein an outlet side of the fan (7) and the input side of the lead-in area (10) arranged hood filter (9) from the fan (7) at least for the first partial flow of clean air provided air filters, characterized in that the hood filter (9) from the fan (7) filters air supplied to both partial flows of clean air and that the second partial flow of clean air from the inlet region (1 0) is forwarded out to the exhaust port (5).
    [10]
    10. The method according to claim 9, characterized in that the blower (7) sucked out of the clean room working area (3) sucked air through an input side of the blower (7) arranged rear wall filter (8).
    [11]
    11. The method according to any one of claims 9 and 10, characterized in that clean air from the first partial flow through at least one between the lead-in (10) and the clean room working area (3) arranged layer of gauze (11) from the lead-in area (10) in the clean room working area (3) flows.
    [12]
    12. The method according to any one of claims 9 to 11, characterized in that the output side of the hood filter (9) prevailing air pressure of the clean air measured and for regulating the clean room working area (3) flowing first partial flow, the air flow of the second partial flow in dependence on the measured air pressure is changed.
    [13]
    13. The method according to any one of claims 9 to 12, characterized in that a throttle device for changing the air pressure in the lead-in region (10) throttles the air flow of the second partial flow by adjusting an adjustable, but otherwise static throttle element and / or by movement of a spring-mounted movable throttle element and / or by adjusting a motor-adjustable throttle element.
    [14]
    14. The method according to any one of claims 9 to 13, characterized in that the second partial flow is passed through a gap (14) with adjustable gap width.
    [15]
    15. The method according to any one of the preceding claims, characterized in that the second partial stream of clean air through a layer of gauze (6), with which the exhaust port (5) is covered, is discharged into the environment (4).
    类似技术:
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    同族专利:
    公开号 | 公开日
    DE102017112346A1|2018-12-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE7025282U|1969-07-08|1971-01-21|Becton Dickinson Co|DEVICE FOR AIR PURIFICATION|
    GB1593597A|1978-05-23|1981-07-22|Howarth Air Eng Ltd|Work cabinet|
    US5665128A|1995-12-05|1997-09-09|Nuaire, Inc.|Clean air cabinet with valved exhaust|
    DE19620252C2|1996-03-19|1998-05-14|Schulz Lufttechnik Gmbh|Interchangeable filter element for safety cabinets in hospitals, pharmacies, research laboratories or the like.|
    MXPA01010895A|1999-04-28|2003-06-24|Stratotech Corp|Adjustable clean-air flow environment.|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102017112346.6A|DE102017112346A1|2017-06-06|2017-06-06|Device and method for venting a clean room working area with clean air and workplace arrangement with the device|
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