EP3562600A1 - Sorbonne de laboratoire à jets de paroi - Google Patents

Sorbonne de laboratoire à jets de paroi

Info

Publication number
EP3562600A1
EP3562600A1 EP17823174.2A EP17823174A EP3562600A1 EP 3562600 A1 EP3562600 A1 EP 3562600A1 EP 17823174 A EP17823174 A EP 17823174A EP 3562600 A1 EP3562600 A1 EP 3562600A1
Authority
EP
European Patent Office
Prior art keywords
trigger
working space
jets
wall
openings
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.)
Granted
Application number
EP17823174.2A
Other languages
German (de)
English (en)
Other versions
EP3562600B1 (fr
EP3562600B8 (fr
Inventor
Jürgen Liebsch
Christian Oliver Paschereit
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.)
Waldner Laboreinrichtungen Se & Co Kg
Original Assignee
Waldner Laboreinrichtungen GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Waldner Laboreinrichtungen GmbH and Co KG filed Critical Waldner Laboreinrichtungen GmbH and Co KG
Publication of EP3562600A1 publication Critical patent/EP3562600A1/fr
Publication of EP3562600B1 publication Critical patent/EP3562600B1/fr
Application granted granted Critical
Publication of EP3562600B8 publication Critical patent/EP3562600B8/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2215/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B2215/003—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area with the assistance of blowing nozzles

Definitions

  • the present invention is concerned with a fume hood, in particular with a flow-optimized and energy-efficient fume hood.
  • EP 0 486 971 A1 It has been proposed in EP 0 486 971 A1 to provide so-called "air foils" at the front edge of the side posts and the front edge of the worktop whose flow-optimized contour is intended to be achieved by the teachings of EP 0 486 971 A1 open sash to less detachment of the incoming room air at the leading surface of the baffles and thus less swirling, but remains behind these baffles, an area in which there may be turbulence, as the incoming air at the downstream end of the baffles can be detached. Reinforced this effect occurs when room air enters the hood at an angle to the side walls.
  • the retention capacity has been further improved by providing airfoil-shaped profiles at a distance from the front edge of the worktop and the side posts, so that room air can enter not only along the airfoil-shaped profiles in the draw-off interior, but also through the between Profiles and the front edge of the worktop on the one hand and the side post on the other hand existing, mostly funnel-shaped gap.
  • the room air is accelerated in the funnel-shaped gap, so that the velocity profile of the exhaust air in the area of the side walls and the worktop is increased.
  • the inventors of the present invention were able to observe, for the first time in fume hoods equipped with conventional support jet technology, that in contrast to previously made investigations with nebulae where no significant flow separation of the wall beams could be observed, the flow field of the wall beams was examined by means of PIV measurements (Particle Image Velocimetry "measurements) flow separation is already a relatively short distance behind the level of the sash and therefore dangerous backflow areas on the side walls can arise.
  • PIV measurements Particle Image Velocimetry "measurements
  • the main objective pursued by the present invention is primarily to further improve the break-out safety of a deduction equipped with a support jet technology while at the same time further reducing its energy consumption.
  • the invention provides on the one hand a deduction for a laboratory space available, which has a housing in which there is a working space which is bounded on the front side by a sash, bottom side of a bottom plate and laterally each of a side wall.
  • the trigger further comprises a first hollow profile disposed on a front end face of each side wall, each first hollow profile having a first pressure chamber fluidly connected to a plurality of first openings comprising air jets in the form of compressed air wall jets along the respective side wall the work space can be spent.
  • the trigger is characterized in that the size of the first openings and the prevailing in the intended use of the trigger in the first pressure chamber air pressure are selected so that the first pressure chamber can be fluidly connected to a building side installed compressed air system, without causing a flow separation of the Wall blasting from the side wall in an area from a front of the working space to at least 25% of the depth of the working space comes.
  • the invention provides a fume hood for a laboratory space having a housing in which a working space is located, the front of a sash, bottom side of a bottom plate and laterally each of a side wall is limited.
  • the trigger further comprises a second hollow profile disposed on a front end face of the bottom plate, the second hollow profile having a second pressure chamber fluidly connected to a plurality of second ports from which air jets in the form of compressed air ground jets along the bottom plate in the Work space can be spent.
  • the trigger is characterized in that the size of the second openings and the pressure prevailing in the intended use of the trigger in the second pressure chamber air pressure are selected so that the second pressure chamber can be fluidly connected to a building side installed compressed air system, without causing a flow separation of the Ground jets from the bottom plate in an area from a front of the working space to at least 25% of the depth of the working space comes.
  • the trigger has both a first hollow profile and a second hollow profile.
  • / is a first and / or a second pressure transducer is provided, which / are fluidly connected to the first and / or the second pressure chamber / is.
  • the first and / or the second pressure transducer comprises a first and / or a second pressure transducer arranged such that a pressure chamber side end of the first and / or the second pressure transducer line flush with an inner surface of the first and / or the second pressure chamber ends. It is also advantageous if a control device is provided which sets the pressure in the first and / or the second pressure chamber in the range of 50 Pa to 500 Pa, preferably in a range of 150 Pa to 200 Pa in the intended use of the trigger.
  • control device is electrically connected to the first and / or the second pressure accumulator.
  • control device is a pressure reducer or a mass flow controller, which is arranged upstream of the first and / or the second pressure chamber.
  • the pressure reducer or the mass flow controller is disposed within the housing.
  • a cross-sectional area seen perpendicular to the flow direction, at least one of the first and / or the second openings, preferably of all first and / or second openings, in a range of 1 mm 2 to 4 mm 2 .
  • a cross-sectional area seen perpendicular to the flow direction, at least one of the first and / or the second openings, preferably all first and / or second openings, in a range of 1.8 mm 2 to 3 mm 2 .
  • An advantageous embodiment of the trigger is when at least one of the first and / or the second openings, preferably all first and / or second openings, is / are such that the first and / or the second opening leaving compressed air jet as periodic oscillating wall jet (100) and / or output as a periodically oscillating ground beam (200) in the working space.
  • the periodicity is in a range of 1 Hz to 100 kHz, preferably 200 Hz to 300 Hz.
  • the periodic oscillation of the wall jet and / or the ground jet is merely non-movable Components of the first and / or the second hollow profile, which are preferably formed in one piece, generates.
  • the periodic oscillation of the wall jet and / or the ground jet is generated by self-excitation.
  • At least one first and / or one second fluidic oscillator is / is provided which comprises the first and / or second opening, preferably a multiplicity of first and / or second fluidic oscillators are provided, which respectively comprise a first and / or a second opening, and which generate / generate the periodic oscillation of the wall jet / wall jets and / or the periodic oscillation of the ground jet / ground jets.
  • first and / or second openings have a circular, round, oval, right-angled or polygonal shape.
  • An advantageous embodiment of the invention relates to a trigger, which is characterized in that at least a first and / or a second opening via a first and / or a second elongated channel with the first and / or the second pressure chamber is fluidly connected, and that the first and / or the second channel has a length L which is at least 3 times, preferably 4 times to 11 times the hydraulic diameter of a cross-sectional area, seen perpendicular to the flow direction, the associated opening.
  • Fig. 1 is a perspective view of a conventional fume hood
  • FIG. 2 is a cross-sectional view of the fume hood shown in FIG. 1 taken along the line A-A shown in FIG. 1;
  • Baseplate profile; 4 shows a cross-sectional view of a hollow profile according to the invention, which is arranged on the front-side end side of the side wall and / or the front-side end side of the bottom plate;
  • Fig. 6 shows the results of PIV measurements of the flow field of
  • FIG. 10 is a diagram showing the reduction of the volume flows of the wall jets at different nozzle geometries of the side post profiles.
  • the fume hood 1 shown in perspective in FIG. 1 corresponds approximately to the fume hood, which is sold by the applicant since about 2002, almost worldwide under the name Secuflow ®. Thanks to the support beam technology described above, this fume hood requires an exhaust air volume flow of only 270 m 3 / (h lfm). This deduction (Designation: Secuflow ® TA-1500) served as a reference for the operations carried out under the present invention, measurements which are described further below.
  • the trigger according to the invention differs in particular with regard to the nozzle geometry of the hollow sections 10, 20 and the way in which the compressed air jets 100, 200 output from the hollow sections 10, 20 are produced, from the conventional Secuflow ® trigger.
  • the fume hood 1 shown in Fig. 1 has a vent interior, the rear side preferably by a baffle 40, laterally by two side walls 36, bottom side by a bottom plate 34 or worktop, the front side by a closable sash 30 and ceiling side preferably limited by a ceiling panel 48 is.
  • the sash 30 is preferably designed in several parts such that a plurality of vertically displaceable window elements 30 extend in the same direction telescopically behind each other during opening and closing of the sash.
  • the window element arranged furthest down in the closed position of the sash 30 preferably has an aerodynamically optimized airfoil profile 32 (FIG. 2) on its front edge.
  • the sash 30 preferably has horizontally displaceable window elements which, even in the closed position of the sash 30, allow the laboratory personnel access to the withdrawal interior.
  • the sash 30 may also be formed as a two-part sliding window, the two parts can be moved in opposite directions in the vertical direction.
  • the opposing parts are coupled via ropes or belts and pulleys with the mass of the sash balancing weights.
  • a channel 63 which leads to a Abluftsammelkanal 50 on the top of the fume hood 1.
  • the exhaust air collection channel 50 is connected to a building side installed exhaust device.
  • Below the worktop 34 of the deduction interior furniture 38 is arranged, which serves as a storage space for different laboratory utensils. This For the purposes of the terminology used here, furniture is to be understood as part of the housing 60 of the fume hood 100.
  • hollow sections 10 are provided at the front end sides of the side walls 36 of the fume hood 1, which are also commonly referred to as side posts.
  • hollow sections 10 are provided at the front end sides of the side walls 36 of the fume hood 1, which are also commonly referred to as side posts.
  • a hollow profile 20 is provided on the front end side of the bottom plate 34.
  • the airfoil-shaped inflow side 10a of the hollow profile 10 or of the side mullion profile 10 is preferably aerodynamically optimized.
  • the wing-like profile geometry allows a low-turbulence, in the optimal case even a turbulence-free inflow of room air in the vent interior with partially or fully open sash 30th
  • support jets i.e. compressed air jets 100, 200 made of compressed air
  • These compressed air jets are conventionally generated by a fan 70 (FIG. 3) arranged below the work surface 34 and inside the housing 60.
  • a fan 70 FIG. 3
  • the hollow sections 10, 20 are preferably in front of the plane of the front sash member.
  • the compressed air jets 100, 200 therefore preferably reach the discharge interior only when the sash 30 is partially or fully opened.
  • the fume hood 1 shown in Fig. 1 is purely exemplary to see because the invention can be applied to different types of fume cupboards, for example, table deductions, low-capacity table deductions, drawdowns, walk-in prints or even mobile fume hoods.
  • these deductions fulfill the valid on the filing date of the present patent application European standard series DIN EN 14175.
  • the deductions can also meet other standards, such as the ASHRAE 110/1995, which is valid for the United States. If reference should be made to a standard in this description and the patent claims, the currently valid standard is always meant here. This is because, according to experience, the regulations specified in the standards are becoming ever stricter, and thus a trigger that meets the current standard also meets the requirements of an older standard.
  • FIG. 2 greatly simplifies the flow pattern of the compressed air jets 100, 200 emerging from the hollow sections 10, 20 within the withdrawal interior and the exhaust air in the channel 63 between the baffle 40 and the rear wall 62 for the exhaust collection channel 50.
  • the view in FIG. 2 corresponds a cross-sectional view along the line AA in Fig. 1st
  • the baffle 40 is preferably spaced on the bottom side of the work surface 34 and preferably from the rear wall 62 of the housing, whereby the exhaust duct 63 is formed.
  • the baffle 40 preferably has a multiplicity of elongate openings 42 (FIG. 1) through which the exhaust air or the air which is located in the withdrawal interior and possibly under toxic loading flows through and can enter the channel 63.
  • the baffle 40 may also preferably be spaced from the side walls 36 of the trigger housing 60. Through a gap formed in this way, exhaust air can additionally be introduced through it into the exhaust air duct 63.
  • a plurality of tripod holders 44 are preferably provided, can be releasably clamped in the rods, which serve as supports for experimental setups in the deduction interior.
  • the compressed air jets 100, 200 are generated by a fan 70 disposed below the bottom plate 34 and preferably within the housing 60.
  • the fan 70 used in the measurements made in the invention was one one-sided sucking centrifugal fan from ebm Papst with the designation G1G097-AA05- 01.
  • the compressed air generated by the fan 70 is first fed into the arranged in the region of the front end side of the bottom plate 34 hollow section 20.
  • the feeding of the fan pressure air into the hollow profile 20 preferably takes place at a location which is approximately in the middle of the longitudinal extension of the hollow profile 20 extending in the width direction of the trigger. In this way it is achieved that the pressure drop in the hollow profile 20 is approximately symmetrical relative to this point.
  • Fig. 3 it can also be seen that the hollow profiles 10, 20 fluidly connected to each other. As a result, a portion of the compressed air reaches the two side post profiles 10 and exits from the side post profiles 10 in the form of support beams 100 along the side walls 36 in the withdrawal interior.
  • FIG. 4 the structure and the geometry of a formed according to an embodiment of the invention hollow profile 10, 20 in cross-section, that is, shown perpendicular to the longitudinal extent of the Hohlpro fils 10, 20.
  • the outer inflow side 10a, 20a is aerodynamically optimized designed as a wing profile.
  • Inside the hollow profile 10, 20 is a pressure chamber 10b, 20b.
  • the compressed air generated by the fan 70 flows along the longitudinal extent of the hollow profile 10, 20.
  • Also along the longitudinal extent of the hollow profile 10, 20 are preferably a plurality of outlet openings 10d, 20d, escape through which the compressed air in the discharge interior can.
  • the multiplicity of spatially separated outlet openings 10d, 20d are arranged in the hollow profile 10, 20 corresponding to the respective point of use of the fume hood 1. They can be distributed irregularly over the length of the hollow profile 10, 20 or arranged according to a certain pattern or even equidistant and regular to each other.
  • the hollow profiles 10, 20 may preferably be formed integrally with the respective side wall 36 and / or the bottom plate 34, e.g. as extruded aluminum profile. Likewise, it is conceivable réellestecken and fix the hollow sections 10, 20 on the end face of the respective side wall 36 and / or the bottom plate 34, or otherwise secure it.
  • FIG. 4 The geometry shown in FIG. 4 is applicable both to the side post hollow profiles 10 and to the hollow profile 20 arranged on the front end side of the work plate or bottom plate 34.
  • the side post profile is referred to as the first hollow profile 10 and the bottom plate profile as the second hollow profile 20.
  • hydraulic diameter In order to be able to compare various fluid-dynamic channels with different cross-sectional shape, which are traversed by a fluid, the so-called hydraulic diameter is used.
  • hydraulic diameter is well known to the person skilled in the art and represents an arithmetic variable which indicates the diameter of a flow channel with an arbitrary cross-section, which has the same pressure loss at the same length and same average flow velocity as a flow tube with a circular cross-section and same diameter.
  • the longitudinal dimension of the outlet openings 10d, 20d ie, the extension of the outlet openings 10d, 20d perpendicular to the longitudinal direction of the hollow sections 10, 20 equal to 30 mm and the transverse dimension to equal to 2 mm.
  • the surface area of the outlet openings 10d, 20d is preferably only 1 mm 2 to 4 mm 2 , and more preferably 1.8 mm 2 to 3 mm 2 .
  • the outlet openings 10d, 20d may preferably have a circular, round, oval, rectangular or polygonal shape.
  • the longitudinal extent of the nearly rectangular outlet openings 10d, 20d is preferably 3 mm and the transverse dimension perpendicular thereto is preferably 1 mm. This results in a hydraulic diameter of 1.5 mm.
  • a hollow profile 10, 20 with outlet openings 10d, 20d formed in this way was also used in the measurement series carried out within the scope of the invention.
  • this hollow section 10, 20 is also referred to by the term "jet nozzles”.
  • At least one outlet opening 10d, 20d, preferably all outlet openings 10d, 20d provided in the hollow profile 10, 20 are fluidly connected to the pressure chamber 10b, 20b via a channel 10c, 20c having a length L (Fig. 4).
  • the length L of the channel is preferably 9 mm.
  • the ratio of the length L to the hydraulic diameter (1.5 mm) is thus equal to 6.
  • the channel 10c, 20c which is connected fluidly to preferably one outlet opening 10d, 20d, should have a length L which is at least 3 times, preferably 4 times to 11 times the hydraulic diameter of the outlet opening 10d, 20d is.
  • compressed air jets are issued into the deduction interior, which a direction "mittician" is given, which is much more pronounced than air jets that only have to go through a shorter channel Opening angle of the compressed air jets 100, 200 propagating in the drawing-off interior.
  • the compressed-air jets 100, 200 are directed so strongly already at the time of leaving the outlet openings 10d, 20d that they bear as close as possible to the side walls 36 and the bottom plate 34.
  • the angle ⁇ (FIG. 4), which the preferably rectilinearly extending channel 10c, 20c encloses relative to the side wall 36 and / or the bottom plate 34, is preferably in a range of 0 ° to 10 °. It should be noted at this point that an air jet passing through a channel that encloses an angle of 0 ° to the associated side wall or base plate will not propagate absolutely parallel to the side wall or base plate in the drawing room interior. This is due to the fact that the mean velocity vector will always occupy an angle of greater than 0 ° to the side wall 36 or the bottom plate 34 even with parallel purging.
  • an outlet geometry shown in Fig. 5 is provided, which is the blowing of a preferably periodically oscillating compressed air jet allows.
  • This nozzle geometry is also referred to below as OsciJet.
  • FIG. 5 corresponds approximately to the partial region indicated by dashed lines in FIG. 4, so that the remaining features of the hollow profiles 10, 20 which were explained in connection with FIG. 4 also on the hollow sections 10 ', 20' of Fig. 5 are transferable.
  • the periodic oscillation is preferably generated by self-excitation and preferably by means of non-movable components, which are preferably formed integrally with the hollow profile 10 ', 20'.
  • Fluidic oscillators are characterized by producing a self-excited vibration in the fluid passing therethrough. This vibration results from dividing the fluid stream into a skin stream and a partial stream. While the main flow is flowing through a main passage 10c ', 20c', the sub-flow flows alternately through one of the two sub-passages 10f, 20f (Fig. 5).
  • the partial stream again meets the main stream and deflects it alternately downwards or upwards, depending on which secondary channel 10f, 20f the partial stream had previously passed through. Due to the alternately changing pressure conditions in the secondary channels 10f, 20f, the partial flow in the next cycle flows through the respective other secondary channel 10f, 20f. This results in a deflection of the main and partial flow in the other direction in the region of the outlet opening 10d ', 20d'. Then the processes repeat themselves.
  • the outlet port 10d ', 20d' is fluidly connected to a pressure chamber 10b ', 20b' via a passage 10c ', 20c' (here, the main passage) having a length L.
  • the channel length L is at least 3 times, preferably 4 times to 11 times the hydraulic diameter of the outlet 10d ', 20d'.
  • the longitudinal extension of the substantially rectangular outlet opening 10d ', 20d' is equal to 1.8 mm and the extension perpendicular thereto equal to 1 mm. This results in a hydraulic diameter of 1.3 mm.
  • the channel length L is preferably 14 mm and thus about 11 times the hydraulic diameter.
  • nozzle geometries are also conceivable which generate a nonperiodic compressed air jet.
  • such nozzle geometries create a reciprocating, stochastically moving compressed air jet.
  • feedback-free fluidic components may be used.
  • Fig. 6 shows the result of PIV measurements of the flow field of the wall beams output from the side of the post section 10 by using the conventional nozzle geometry of Secuflow ® trigger (Fig. 6A) jet nozzle geometry (Fig. 6B) and the OsciJet nozzle geometry (Fig 6C).
  • the fan voltage was 9.85V in the measurements shown in FIG.
  • Fig. 6a can be clearly seen how the air flowing through the open sash room air despite blowing of support beams 100 from the hollow section 10 is detached after about 150 mm behind the front sash, which corresponds to the 0-position of the side wall. This detachment was not observed in previous fog examinations. Such a detachment can not be seen in FIGS. 6b and 6c.
  • FIG. 6 shows the result of PIV measurements of the flow field of the wall beams output from the side of the post section 10 by using the conventional nozzle geometry of Secuflow ® trigger (Fig. 6A) jet nozzle geometry (Fig. 6B) and the Os
  • the room air flows along the side wall without turbulences and the formation of backflow areas.
  • the field line density which indicates higher air velocities, is significantly higher in the region of the side wall in FIG. 6B and in FIG. 6C than in FIG. 6A. From this and the OsciJet nozzle geometry can be concluded that the ambient air in the case of jet nozzle geometry (Fig. 6B) (Fig. 6C) significantly faster flows toward the baffle wall of the hood inner space than in the case of the conventional nozzle geometry of Secuflow ® trigger (Fig. 6A). Likewise, it can be seen in FIG. 6B and FIG. 6C how the room air itself extends at a distance from the side-post profile 10, 10 '(y-axis) towards the side wall, while in FIG. 6A the room air tends to be more of the side wall flows away.
  • Jet and OsciJet Düsenauslassöff openings 10d, 20d and 10d ', 20d' provides a measurement of the air outlet velocity with the aid of a Hitzdrahtaneometers no reproducible results.
  • the hot-wire ananometer oscillates even with the periodically oscillating support beams.
  • a method for determining the minimum volume flows was then developed.
  • the associated experimental setup is shown in FIGS. 7 and 8 shown.
  • the determination of the volume flow of the wall beams takes place in two steps. As shown in Fig. 7, by means of a voltage regulator 72, the control voltage of the fan 70 is set to a value at which the flow field of the wall jets verified by means of PIV measurements shows almost no significant flow separations. At the measuring points 1, 2, 3, 4, 5 and 6, the static pressure within the hollow sections 10, 10 'and 20, 20' is subsequently determined.
  • a pressure transducer 80 is used which preferably measures the static pressure in the pressure chambers 10a, 10a 'and 20a, 20a' of the hollow profiles 10, 10 'and 20, 20' via respective pressure transducer lines 82.
  • the pressure transducer lines 82 are preferably arranged so that their pressure-chamber-side end surface flush on an inner surface of the respective pressure chamber 10a, 10a 'and 20a, 20a' ends.
  • a hollow profile 10 with jet nozzles is used by way of example on the left side post, and a hollow profile 10 'with OsciJet nozzles is used on the right side post.
  • a second measuring step as can be seen in FIG. 8, the fan 70 is replaced by a compressed air connection 74. Downstream of the compressed air port 74, a calibrated pressure reducer or mass flow controller 76 is placed.
  • the mass flow controller used here was from the company Teledyne Hastings Instruments, Series 201. After setting the static reference air pressure determined in the first measuring step in the Hollow profiles 10, 10 'and 20, 20' can be determined with the help of the mass flow controller of the associated mass flow. Taking into account the ambient pressure and the ambient temperature, the volumetric flow can be calculated from the respective mass flow.
  • FIG. 9 shows the measured static air pressures in the pressure chambers 10a, 10a 'of the hollow profiles 10, 10'.
  • the lowest solid line is presented merely for purposes of comparison and shows the static air pressure in the hollow profile of the series trigger Secuflow ®, namely at a fan voltage of 4.41 V.
  • the average static air pressure here is 12.5 Pa.
  • the dotted line indicates an average value of 65 Pa and was determined for the Jet and OsciJet nozzles at a fan voltage of 4.41V.
  • the top dashed line corresponds to an average air pressure of 197 Pa. This was determined at a fan voltage of 9.85 V using the Jet and OsciJet nozzles.
  • the series ® within the profile of the trigger Secuflow are not shown at a fan voltage of 9.85 V measured average static air pressures in Fig. 9.
  • the inventors have concluded that due to the greatly reduced volume flow rates it is now possible to provide a full fume hood, i. H. To operate a laboratory fume hood, which complies with the DIN EN 14175 series of standards, in accordance with the requirements of a building-standard compressed-air system.
  • the person skilled in the art is aware at this point that such compressed air systems installed on the building side can usually provide an air pressure in a range of 0 to 7 bar. A power-driven fan is unnecessary.
  • outlet openings 10d, 10d 'of the side-post profile 10, 10' and not all outlet openings 20d, 20d 'of the bottom plate profile 20, 20' which are intended for the output of wall jets 100 or ground jets 200 in the respective hollow profile 10, 20 According to the invention, they must have the nozzle geometry shown in FIG. 4 or FIG. 5 in order to realize the subject matter specified in the patent claims. It is therefore sufficient that at least one outlet opening 10d, 10d 'of the side-post profile 10, 10' and / or at least one outlet opening 20d, 20d 'of the bottom-plate profile 20, 20' is / are formed in this way. The same applies to the length L of the channel 10c, 10c 'and 20c, 20c', which is provided immediately upstream of the respective outlet opening 10d, 10d 'and 20d, 20d'.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Ventilation (AREA)

Abstract

L'invention concerne une sorbonne (1) de laboratoire comportant un premier profilé creux (10, 10') agencé sur un côté frontal avant de chaque paroi latérale (36) et présentant une première chambre de pression (10b, 10b') munie d'une pluralité de premières ouvertures (10d, 10d') par lesquelles des jets d'air sous forme de jets de paroi (100) composés d'air comprimé peuvent être diffusés dans l'espace de travail le long de la paroi latérale (36) concernée. La dimension des premières ouvertures (10d, 10d') et la pression de l'air régnant dans les premières chambres de pression (10b, 10b') sont choisies de telle manière que les premières chambres de pression (10b, 10b') peuvent être raccordées fluidiquement à un système d'air comprimé (74) installé côté bâtiment, sans provoquer un décollement de filets des jets de paroi (100) à partir de la paroi latérale (36) dans une zone du côté avant de l'espace de travail jusqu'à au moins 25 % de la profondeur de l'espace de travail. L'invention concerne par ailleurs une sorbonne sur laquelle un profilé creux de ce type (20, 20') est agencé sur un côté frontal avant de la plaque de base (34).
EP17823174.2A 2016-12-29 2017-12-28 Sorbonne de laboratoire à jets de paroi et/ou de fond Active EP3562600B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016125890.3A DE102016125890A1 (de) 2016-12-29 2016-12-29 Laborabzug mit Wandstrahlen
PCT/EP2017/084704 WO2018122302A1 (fr) 2016-12-29 2017-12-28 Sorbonne de laboratoire à jets de paroi

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JP (1) JP6669684B2 (fr)
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CN (1) CN110114153B (fr)
AU (1) AU2017387829A1 (fr)
CA (1) CA3048534A1 (fr)
DE (1) DE102016125890A1 (fr)
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CN110180855A (zh) * 2019-06-24 2019-08-30 北京成威博瑞实验室设备有限公司 一种实验室通风柜
DE102020132826B3 (de) 2020-12-09 2022-05-25 Waldner Laboreinrichtungen Gmbh & Co. Kg Laborabzug mit Strömungsgeräuschreduzierung
KR102500454B1 (ko) * 2021-04-26 2023-02-20 쏠코리아 주식회사 실험실 흄후드
CN113751452B (zh) * 2021-08-20 2023-04-07 哈工大泰州创新科技研究院有限公司 一种实验室通风柜

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TW201829084A (zh) 2018-08-16
KR20190103169A (ko) 2019-09-04
JP6669684B2 (ja) 2020-03-18
AU2017387829A1 (en) 2019-07-25
TWI678239B (zh) 2019-12-01
US20190351465A1 (en) 2019-11-21
CN110114153A (zh) 2019-08-09
CN110114153B (zh) 2022-06-10
EP3562600B1 (fr) 2022-08-10
WO2018122302A1 (fr) 2018-07-05
JP2018108568A (ja) 2018-07-12
DE102016125890A1 (de) 2018-07-05
EP3562600B8 (fr) 2022-12-28
CA3048534A1 (fr) 2018-07-05

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