EP1935516B1 - Etabli de sécurité doté d'une cuve au sol à double paroi - Google Patents

Etabli de sécurité doté d'une cuve au sol à double paroi Download PDF

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Publication number
EP1935516B1
EP1935516B1 EP07021473A EP07021473A EP1935516B1 EP 1935516 B1 EP1935516 B1 EP 1935516B1 EP 07021473 A EP07021473 A EP 07021473A EP 07021473 A EP07021473 A EP 07021473A EP 1935516 B1 EP1935516 B1 EP 1935516B1
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EP
European Patent Office
Prior art keywords
safety
opening
safety workbench
workbench
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP07021473A
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German (de)
English (en)
Other versions
EP1935516A1 (fr
Inventor
Olaf Brömsen
Edmund Frickel
Christoph Noll
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thermo Electron LED GmbH
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Thermo Electron LED GmbH
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Publication date
Application filed by Thermo Electron LED GmbH filed Critical Thermo Electron LED GmbH
Publication of EP1935516A1 publication Critical patent/EP1935516A1/fr
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Publication of EP1935516B1 publication Critical patent/EP1935516B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area
    • B08B15/023—Fume cabinets or cupboards, e.g. for laboratories

Definitions

  • the invention relates to a safety workbench with a work space enclosed by a housing, the lower end of which is formed by a floor pan and which is accessible on a housing front side via a work opening which can be closed by means of an adjustable windshield.
  • Safety cabinets fulfill various functions. They are primarily intended to protect the operator from direct exposure to infectious aerosols, to protect the immediate laboratory environment from contamination by released aerosols (environmental and personal protection) and to protect the product and materials used from contamination by environmental microorganisms ,
  • the basic structure of safety workbenches comprises an interior space enclosed by a housing, which has a work opening on the front side of the housing which can be closed by an upwardly or downwardly adjustable, transparent front window.
  • the interior is referred to in the context of the invention as a working space or working space.
  • Such safety workbenches are already known in various embodiments from the prior art, for example from the DE 44 41 784 A1 , of the DE 102 17 903 C1 , of the DE 297 23 636 U1 and the DE 100 17 196 A1 ,
  • safety workbenches have a floor pan in the lower section of the working area.
  • Such floor trays close the working space down tightly, catch substances seeping through the worktop and prevent them from inadvertently escaping to the outside and contaminating the environment of the safety cabinet.
  • a floor pan of the prior art is for example in the DE 102 14 158 A1 described.
  • the floor pan is formed out of a one-piece metal sheet and correspondingly single-walled.
  • Safety workbenches in laboratories, especially those that are suitable for microbiological work, must therefore meet stringent safety requirements. They have blowers that generate directional air currents and pass them through special filters to remove particles or aerosols entrained in the air and to prevent them from reaching the operator or the safety cabinet.
  • blowers that generate directional air currents and pass them through special filters to remove particles or aerosols entrained in the air and to prevent them from reaching the operator or the safety cabinet.
  • Such a safety workbench is for example in the DE 10 2004 032 454 A1 described.
  • the so-called personal protection in safety workbenches is achieved by sucking in outside air through the working opening into the workspace of the safety workbench. As long as this outside air flow is not obstructed and sufficient air is sucked in, particles and aerosols can not escape from the interior of the safety cabinet to the outside. The sucked outside air thus forms an air curtain which flows through the working opening and which protects the person working at the safety workbench or the environment from contamination by the particles.
  • Within the working space of the safety cabinet prevails due to the flow control a relation to the pressure in the vicinity of the safety cabinet reduced pressure, hereinafter also referred to as negative pressure.
  • the negative pressure ends at the working space facing surface of the floor pan, which forms the lower end of the working space.
  • Object of the present invention is therefore to provide a safety workbench, in which the risk of leakage of contamination through a damaged floor pan in the environment of the safety cabinet compared to the prior art significantly reduced and excluded as possible.
  • the invention accordingly relates to a safety workbench with a work space enclosed by a housing, the lower end of which is formed by a floor pan and which is accessible on a housing front side via a work opening which can be closed by means of an adjustable windshield.
  • the floor pan is of double-walled construction and has an inner wall and an outer wall which enclose a vacuum which can be set under negative pressure, wherein at least one of the walls has at least one opening communicating with a means for generating the negative pressure.
  • the inner wall is received in the outer wall, that between the two walls a settable under negative pressure space is included.
  • at least one opening is provided which communicates with a means for generating the negative pressure. Apart from the at least one opening for applying the negative pressure, the inner and outer walls thus form a closed structure.
  • the space is, apart from the at least one opening, completely enclosed by the inner and outer walls. If the means for generating the negative pressure is put into operation, so forms a negative pressure in the intermediate space. If, as a result of damage to the floor pan but contaminants get into the space, their leakage from the space in the vicinity of the workbench is at least difficult and usually completely prevented.
  • the impurities may be withdrawn from the gap by the means for generating the negative pressure and supplied to a cleaning device which removes the impurities from the withdrawn air.
  • the means for generating the negative pressure is not particularly limited in principle.
  • it may be a pump or a fan.
  • the intermediate space of the floor pan could be connected via the at least one opening to an exhaust air system, which dissipates and cleans the room air at the site. If desired, between the opening of the floor pan and the exhaust system still be a filter between. It is particularly advantageous to use a blower already present in the safety workbench as the means for generating the negative pressure.
  • the at least one opening of the bottom pan when the at least one opening of the bottom pan, is applied to the vacuum, connected to one of the negative pressure areas of the ventilation system of the safety cabinet, in particular with the channel described above behind the working interior. Preference is therefore also the at least one opening of the bottom pan in the rear region - so facing away from the front side of the housing - arranged.
  • the position of the opening is not limited, and it may be provided both in the inner and in the outer wall. Due to the better accessibility, the at least one opening is usually present but preferably in the outer wall. For ease of connection, an intake manifold may be provided over the opening.
  • Shape, size, number and location of the opening are suitably chosen so that in the intermediate space, a sufficient negative pressure is achieved, which extends suitably in all areas of the gap.
  • a spatial distribution of the openings over the surface of the floor sump may be expedient. Otherwise, the properties mentioned are not subject to any particular restriction.
  • the bottom pan itself can - apart from the double-walled design and attaching the at least one opening to achieve a negative pressure in the space - in be formed in the usual way. It makes sense to form the bottom of at least the inner wall inclined, so that accumulated in the bottom tray liquid drains to a lowest point.
  • an outlet can be arranged in a known per se, through which the accumulated liquid can be discharged from the bottom tray.
  • the outlet is expediently guided downwardly through the inner and outer walls in such a way that no opening to the intermediate space is created in the floor pan, which jeopardizes the formation of the negative pressure.
  • a pipe is guided through the inner and outer walls, on the outer circumference of which the inner and outer walls join tightly.
  • the tube may be closed at its lower end with a tap, valve or the like.
  • the inventive design of the bottom tray is reliably prevents contaminants in this area unintentionally come to the outside and contaminate the environment of the safety cabinet. Even if the wall of the floor pan is damaged, the double-walled construction and the presence of a negative pressure on the gap prevent disadvantages for the user and the environment. It is particularly advantageous that according to the invention means can be provided to determine damage to the floor pan.
  • a measuring means may be provided which measures the negative pressure in the intermediate space.
  • This measuring means may consist of any conventional pressure gauge and be for example a pressure cell, which is arranged either in the intermediate space itself or in the vicinity of one of the vacuum openings of the bottom pan. If one of the walls of the floor pan is damaged, the pressure in the space increases. This is determined by the measuring device.
  • a comparison value can be stored, which defines a specific pressure in the intermediate space as the desired value. If a comparison unit in the safety monitoring device now detects a deviation from this setpoint, an alarm generator is triggered to output a visual and / or audible alarm.
  • the visual alarm can be issued not only by a flashing light or the like, but it can also be issued on a likewise usually existing display a corresponding warning message that indicates damage to the floor pan, so that it can be repaired.
  • a comparison value range can also be stored in order to allow certain harmless pressure fluctuations in the intermediate space.
  • FIG. 1 shows a safety cabinet 1, as it can be used for example in microbiological work.
  • the working space 3 of the safety cabinet 1 is enclosed by a housing 2.
  • a front window 5 is mounted, which can be adjusted so that work on samples in the working space 3 can be made.
  • the samples can be placed on a working level 7, which is provided with louvers 8.
  • Through air slots 8 through contaminated air is withdrawn from the working room 3, continued below the working level 7 towards the rear in the direction of a bottom-up running, separate from the working room channel 11 and finally sucked by the fan 12.
  • the contaminated air is passed through a filter, not shown here, to remove the impurities.
  • the safety cabinet leaving air is replaced by ambient air entering through the working port 6.
  • the incoming air flow prevents leakage of impurities.
  • a base tray 9 is arranged so that it closes the working space 3 from below against the environment of the safety cabinet. Damage to the floor pan carries the risk that contaminants will end up in the vicinity of the safety cabinet.
  • the bottom tray 9 is formed according to the invention double-walled. This is FIGS. 2 to 5 refer to.
  • the double-walled floor pan 9 consists of an inner wall 9a, which is inserted into a larger outer wall 9b. Both walls are circumferentially fixed together at their upper edges and form, except for an opening 10, a completely closed structure. Between the walls, a gap 17 is formed, which extends virtually over the entire surface of the floor pan.
  • the opening 10, which provides the only access to the intermediate space 17, is located in a rear region of the outer wall 9b facing away from the housing front side 4.
  • an intake manifold 18 is connected to the outer wall. If the fan 12 is operated, created by the air flow from bottom to top in the channel 11 and thus from the opening 10 away a negative pressure in the space 17. Should due to damage to the inner wall 9a material from the working interior 3 on the openings 8 in the working plane 7 and through the wall 9a pass through, the material does not equal unhindered in the environment of the safety cabinet 1 from. Rather, it is collected in the outer wall 9b, withdrawn from there from the intermediate space 17 and fed to the filtration devices of the safety workbench.
  • the negative pressure is suitably monitored.
  • the negative pressure is measured with a pressure gauge such as a pressure cell 13, which is arranged here directly at the outlet of the intake manifold 18.
  • the pressure readings which may be measured continuously or at predetermined intervals, are communicated to a safety monitoring system 19, as is commonly found in safety cabinets.
  • There the pressure measurement value is compared with a comparison value or comparison value range which defines the permissible pressure or pressure range in the intermediate space. If the measured value differs from the comparison value or comparison value range - for example because the pressure has increased as a result of damage to the floor pan - the safety monitoring system issues a visual and / or audible alarm. For example, a message can be issued on a display that the pressure in the floor pan is too high and the floor pan needs to be checked.
  • the shape of the floor pan corresponds largely and so far for floor pan of safety cabinets usual forms.
  • the inner wall 9a here has a rectangular bottom plate 16 and perpendicular to this projecting or outwardly inclined side walls 15.
  • the bottom plate 16 is inclined to the housing front side 4 down and to the left.
  • the opening for an outlet 14 is at the lowest point of the inner wall 9a.
  • the outer wall 9b corresponds in shape to the wall 9a, but is opposite to this increased.
  • the outlet 14 is formed by a cylindrical tube which penetrates the inner and outer walls 9a, 9b and projects downwardly on the underside of the wall 9b.
  • the pipe can be closed with a tap. For example, it leads to a collection system for the disposal of contaminated waste. So that the negative pressure in the intermediate space 17 is not canceled, the outer and inner walls are connected tightly to the outer circumference of the tube.
  • the bottom pan may be made of any material heretofore used for this purpose in the usual way, provided that they are suitable for producing the double-walled structure.
  • the bottom tray made of metal, particularly corrosion-resistant metal such as stainless steel in particular.
  • the bottom and side walls can be made of individual parts or by folding from larger sheets. The joints of the edges and corners of the floor pan panels are connected to each other, for example, by a soldering, welding or laser method.

Landscapes

  • Devices For Use In Laboratory Experiments (AREA)
  • Ventilation (AREA)
  • Workshop Equipment, Work Benches, Supports, Or Storage Means (AREA)

Claims (8)

  1. Établi de sécurité (1) avec un espace intérieur de travail (3) entouré par un capotage (2), dont la limite inférieure est formée par un bac de fond (9) et qui est accessible par une face avant (4) du capotage à travers une ouverture de travail (6) pouvant être fermée par une plaque de façade (5) déplaçable, caractérisé en ce que le bac de fond (9) est réalisé avec une double paroi et présente une paroi intérieure (9a) et une paroi extérieure (9b) qui délimitent entre elles un espace intermédiaire (17) pouvant être mis sous dépression, et en ce qu'au moins une des parois (9a, 9b) présente au moins une ouverture (10) qui communique avec un moyen (12) pour créer la dépression.
  2. Établi de sécurité (1) selon la revendication 1, caractérisé en ce que le moyen (12) pour créer la dépression est une soufflerie de l'établi de sécurité (1).
  3. Établi de sécurité (1) selon les revendications 1 et 2, caractérisé en ce que l'au moins une ouverture (10) est disposée dans la paroi extérieure (9b) du bac de fond (9).
  4. Établi de sécurité (1) selon l'une des revendications précédentes, caractérisé en ce que l'au moins une ouverture (10) est ménagée sur le côté du bac de fond (9) tourné à l'opposé de la face avant (4) du capotage.
  5. Établi de sécurité (1) selon l'une des revendications précédentes, caractérisé en ce qu'un raccord d'aspiration (18) est disposé sur l'au moins une ouverture (10) du bac de fond (9).
  6. Établi de sécurité (1) selon l'une des revendications précédentes, caractérisé en ce que le bac de fond (9) présente au moins une évacuation supplémentaire (14) pour évacuer le liquide accumulé sur la paroi intérieure (9a), qui traverse les parois intérieure et extérieure (9a, 9b) de telle manière que l'espace intermédiaire (17) ne soit pas ouvert vers l'extérieur.
  7. Établi de sécurité (1) selon l'une des revendications précédentes, caractérisé en ce qu'un moyen de mesure (13) est prévu pour déterminer la dépression dans l'espace intermédiaire (17).
  8. Établi de sécurité (1) selon la revendication 7, caractérisé en ce qu'il comporte un dispositif de surveillance de sécurité (19) comprenant un moyen qui compare la valeur de mesure de la pression transmise par le moyen de mesure (13) à une valeur de comparaison ou plage de valeurs de comparaison enregistrée et qui déclenche une alarme optique et/ou sonore en cas de divergence.
EP07021473A 2006-12-21 2007-11-05 Etabli de sécurité doté d'une cuve au sol à double paroi Active EP1935516B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006060712A DE102006060712B3 (de) 2006-12-21 2006-12-21 Sicherheitswerkbank mit doppelwandiger Bodenwanne

Publications (2)

Publication Number Publication Date
EP1935516A1 EP1935516A1 (fr) 2008-06-25
EP1935516B1 true EP1935516B1 (fr) 2012-08-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07021473A Active EP1935516B1 (fr) 2006-12-21 2007-11-05 Etabli de sécurité doté d'une cuve au sol à double paroi

Country Status (4)

Country Link
US (1) US7770617B2 (fr)
EP (1) EP1935516B1 (fr)
CN (1) CN101204710B (fr)
DE (1) DE102006060712B3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101862687A (zh) * 2010-05-19 2010-10-20 苏州市金净净化设备科技有限公司 一种生物安全柜传递窗
CN106426028A (zh) * 2016-11-02 2017-02-22 平湖市耀华金属制品有限公司 一种双面胶生产设备的工作台
CN109092838A (zh) * 2018-08-07 2018-12-28 山东沃柏斯实验室工程有限公司 一种洗涤台排气罩
CN111345601A (zh) * 2018-12-21 2020-06-30 青岛海尔洗衣机有限公司 用于储衣设备的储衣装置
CN111308036A (zh) * 2019-12-23 2020-06-19 张熙睿 一种用于污水酸碱度检测用操作台及使用方法
DE102021108910A1 (de) 2021-04-09 2022-10-13 Thermo Electron Led Gmbh Laborgerät

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Publication number Priority date Publication date Assignee Title
NL6601730A (fr) * 1966-02-10 1967-08-11
US4408642A (en) * 1981-06-01 1983-10-11 Jeruzal Thomas M Portable workbench
DE4441784C2 (de) * 1994-11-25 1997-05-28 Heraeus Instr Gmbh Sicherheitswerkbank
US5582225A (en) * 1995-05-22 1996-12-10 Schank; Earle Dust free work bench
US5733188A (en) * 1996-08-12 1998-03-31 Landis & Staefa, Inc. Speed of laboratory fume hood sash opening monitor and indicator
DE29723636U1 (de) * 1997-06-06 1999-01-07 KENDRO Laboratory Products GmbH, 63450 Hanau Laborwerkbank
DE10017196A1 (de) * 2000-04-07 2001-10-11 Kendro Lab Prod Gmbh Sicherheitswerkbank
US6557602B1 (en) * 2001-09-21 2003-05-06 Le Roy S. Sorensen Enclosed wet saw table
DE10214158B4 (de) * 2002-03-28 2008-04-10 Thermo Electron Led Gmbh Bodenwanne für eine Sicherheitswerkbank und Verfahren zu deren Herstellung
DE10217903C1 (de) * 2002-04-22 2003-10-02 Kendro Lab Prod Gmbh Sicherheitswerkbank mit vereinfachter Bedienbarkeit
TW517599U (en) * 2002-05-21 2003-01-11 San Ford Machinery Co Ltd Desk-top dust collector
US6966350B1 (en) * 2002-09-25 2005-11-22 Delta International Machinery Corp. Power tool supporting cabinet with a detachable dust bin
DE102004032454A1 (de) * 2004-06-24 2006-01-12 Kendro Laboratory Products Gmbh Sicherheitswerkbank

Also Published As

Publication number Publication date
CN101204710B (zh) 2012-02-15
CN101204710A (zh) 2008-06-25
EP1935516A1 (fr) 2008-06-25
US7770617B2 (en) 2010-08-10
US20080150405A1 (en) 2008-06-26
DE102006060712B3 (de) 2008-06-12

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