EP1839766B1 - Extractor with front extractor aperture - Google Patents

Abstract

The cupboard (10) has an outlet chamber, side panels (11,12), an actuating opening, a bottom (16) and a cover. A discharge port sucks off exhaust air from the outlet chamber, where the discharge port is arranged in the range of the actuating opening cover. The guiding device is assigned to the discharge port having a guiding element for leading along the exhaust air current at the cover, where guiding element has a spoiler.

Description

The invention relates to a trigger with a trigger chamber having side walls, a closable actuating opening, a bottom and a cover, and having an exhaust port for sucking exhaust air from the discharge chamber, wherein the exhaust port is disposed adjacent to the cover of the actuating opening, and the Exhaust opening is assigned a facing away from the actuating opening directed guide element.

Such a deduction is from the US Pat. No. 2,819,666 known. Deductions of this kind are used in laboratories and for demonstration in schools or science, when the effect of harmful substances in gas or dust form on humans should be avoided in an experiment or a process step.

On the one hand, the operating opening must be accessible to an operator, so that experiments or process steps can be carried out in the drawing-off chamber. On the other hand, however, pollutants must be removed from the actuation opening as quickly as possible and be reliably sucked off, so that a load on the operator is avoided as far as possible. A disadvantage of the known prints is that in the interior of the discharge chamber generally forms a flow roll, so that on the one hand pollutants are quickly sucked from the region of the actuating opening into the interior of the drawing chamber. However, these pollutants are partially returned to the actuating opening by the roll flow under unfavorable conditions, so that an unwanted burden on the operator can occur due to this backflow. Various approaches to solving this problem go there, the formation of a roller flow in the interior Avoid the discharge chamber as much as possible so that backflow does not occur. However, it has been shown that this relatively large suction power is required to still remove pollutants from the area of the operating opening as quickly as possible.

The invention is based on the problem of specifying a deduction, with which can be removed quickly and reliably with low suction pollutants from the range of actuation opening, while a burden on an operator is avoided by possible from the interior of the discharge chamber to the actuating port pollutants.

The problem is solved in that in a trigger of the type mentioned, the guide element guide means for guiding the exhaust air flow along the cover along.

By means of the arranged in the front, upper region of the exhaust chamber exhaust port, the formation of a flow roll inside the exhaust chamber is not prevented, but just supported. As a result, pollutants from the area of the actuating opening in the form of the voluntarily forming roller flow are quickly sucked off into the interior of the drawing chamber and transported upwards on the rear wall with a relatively low suction power. A return flow of pollutants to the actuating opening is avoided, however, because in the upper front region after passing through a half-roller, the pollutants are extracted.

Further, the exhaust port is assigned a directed away from the actuating opening directed guide element. The guide element may be funnel-shaped. By means of this guide element can be a formation of a complete flow roll largely suppress and support a reliable suction of pollutants in the front upper portion of the discharge chamber. In addition, the guide element has guide means for guiding the exhaust air flow along the cover. In this way, the flow along the cover along can be largely accelerated, so that a good suction in the region of the actuation opening and at the same time a reliable removal of pollutants from the discharge chamber is effected. Advantageously, the guide means on a spoiler, with which the suction effect can be reliably concentrated approximately parallel to the cover.

A development of the invention is characterized in that the exhaust air opening is formed as an elongated exhaust air gap which extends over the width of the actuating opening. By means of this area suction through the elongated exhaust air gap high flow velocities in the gap achieved with which specifically from the flow roll, the pollutants can be extracted.

Another development of the invention is characterized by an exhaust air distributor in a region of the cover facing away from the exhaust air opening. By means of such an exhaust manifold, the exhaust air can be easily and reliably distributed to a lower exhaust port for sucking heavy pollutants and for starting the flow roll in the interior of the exhaust chamber and the front upper exhaust port. The exhaust manifold should be in fluid communication with the exhaust port to provide sufficient exhaust air. It is advantageous if the exhaust air manifold is arranged adjacent to a rear wall of the drawing-off chamber and has a cross-section that tapers toward the bottom. In this way, the exhaust manifold can assist in forming and guiding the flow roll.

In a modified embodiment Abluftleitmittel are provided for guiding the exhaust air flow to other exhaust ports. By means of these further exhaust vents, the triggering effect can be controlled and strengthened specifically. Preferably, the Abluftleitmittel are in fluid communication with the exhaust manifold so that a good trigger effect is achieved.

In a further development, the Abluftleitmittel on a Abluftleitplatte, which is arranged at a distance from the rear wall of the discharge chamber and forms with this a Abluftleitkanal. In this way, the exhaust air flow can be easily and suitably conducted to the other exhaust openings, so as to assist the exhaust effect advantageous. The Abluftleitplatte may have in their, the ground adjacent area the other exhaust ports. For example, the Abluftleitplatte to form the other exhaust openings from the bottom ends. It is also possible that the Abluftleitplatte has lateral recesses for forming the other exhaust ports. It is particularly advantageous if the further exhaust air openings are arranged in a U-shape. The thus formed further exhaust openings can be provided without great design effort, at the same time a particularly good removal of pollutants from the area of the actuating opening is achieved. If the Abluftleitkanal is divided into two lateral channel sections, so can achieve a particularly good and targeted Abluftleitwirkung to the other exhaust ports.

In an advantageous development of the invention, flow-guiding means are provided for guiding the flow of air in the draw-off chamber. The flow-guiding means can have flow-guiding elements in the rear region of the drawing-off chamber. In this way, the formation of the flow roller from the operating opening away and towards the exhaust port is supported particularly advantageous. It is also possible that the flow guiding elements form installation channels with the side walls and the rear wall. Because this installations can be performed and arranged in these installation channels, so a particularly large volume of the discharge chamber can be achieved with given external dimensions. If the installation channels have a triangular cross-section, such a flow line of the flow roll inside the withdrawal chamber is favorably influenced. The flow directors may also have supply ports for fluid media, electricity, and / or data lines. Especially when training as installation channels so results in a simple structure with good accessibility of the supply connections in the discharge chamber.

An advantageous embodiment also results from the fact that form the flow guide with the cover and the rear wall the exhaust manifold. This results in a simple structure with few components.

It is also advantageous if the flow guide elements have a spoiler in the region of the actuation opening for returning the air flow into the draw-off chamber. Such a return line into the discharge chamber, ie in the region of the flow roll in the interior, does not lead to suctioned pollutants away from the actuating opening and again to the exhaust port, so that a burden on an operator is avoided in front of the actuating opening. The spoiler may be disposed adjacent to the sidewall of the actuation opening so as to avoid backflow to the operator.

In another embodiment of the invention, a sash is provided for displacing the actuating opening. By means of such a sash, the operating opening can be closed so far that handling in the interior of the drawing chamber by an operator is just possible, but the remaining opening of the actuating opening is kept as small as possible. In this case, the spoiler can be arranged on the sash, so as to ensure even remaining residues of pollutants from the actuating opening and thus away from the operator back into the interior of the drawing chamber and thus into the flow roll back to the exhaust port. In an advantageous embodiment of the sash is formed in two parts and the spoiler arranged on the upper part. This is already happening early on the spoiler at the top of a backflow of possibly not extracted pollutants back into the flow roll and thus again guaranteed to the exhaust port. The remaining pollutant backflow to the actuation port is thus further reduced.

Another embodiment of the invention, which can also be used independently of the invention, is characterized by a fall protection for the sash. The fall arrester preferably has a gas pressure spring. But the fall protection can also have a pneumatic damper, which is adjustable in an advantageous development. Such a gas spring or such a pneumatic damper as fall protection can be easily arranged and easily accessible for maintenance. Preferably, the fall arrester may be disposed adjacent the cover and the sash. In this way, the fall arrest is easily accessible by means of a ladder from the top front.

Yet another embodiment of the invention is characterized by a guide profile for the sash. This development is also applicable regardless of the invention. In a further development, the guide profile has at least one guide groove and at least one further groove, wherein the further groove is closed to the outside with a low material thickness. Such a guide profile reduces the storage costs for the items of the trigger. In cases where the additional groove is not needed, the contamination of this additional groove is avoided by their closed design. For the cases in which the additional groove is to be used, the closure can be easily removed with a low material thickness. For example, this predetermined breaking points can be provided so that the material can be easily pushed out.

A particularly advantageous development of the invention, which can also be used independently of the invention, is characterized by a modular design. A further development is characterized by a Z-profile held by frames, in which module elements can be suspended. In this Z-profile, for example, a base cabinet, the bottom plate of the trigger chamber or other element of the trigger can be hung. As a result, on the one hand facilitates assembly and on the other hand ensures great flexibility in the production of the trigger.

Fig.1

eine schematische Vorderansicht eines Abzugs mit den Erfindungsmerkmalen,

Fig. 2

eine geschnittene Seitenansicht des Abzugs in schematischer Darstellung,

Fig.3

eine schematische Teildarstellung eines vorderen oberen Bereichs des Abzugs mit einer Abluftöffnung,

Fig. 4

eine Draufsicht auf den Abzug in schematischer Darstellung,

Fig.5

eine Schnittdarstellung des Abzugs in Draufsicht auf den Boden in schematischer Darstellung, und

Fig. 6

eine geschnittene Teildarstellung einer Seitenwand des Abzugs mit einem Führungsprofil.

An embodiment of the invention will be explained in more detail with reference to the drawings. Show it:

Fig.1

a schematic front view of a trigger with the invention features,

Fig. 2

a sectional side view of the trigger in a schematic representation,

Figure 3

a schematic partial view of a front upper portion of the trigger with an exhaust port,

Fig. 4

a top view of the trigger in a schematic representation,

Figure 5

a sectional view of the trigger in plan view of the ground in a schematic representation, and

Fig. 6

a sectional partial view of a side wall of the trigger with a guide profile.

Fig. 1 shows a front view of a trigger 10 with the features of the invention in a schematic representation. The trigger 10 has side walls 11, 12, between which an actuating opening for a trigger chamber in the interior of the trigger 10 is arranged. The actuating opening can be closed by means of a sash 13. In the figure, the sash 13 is shown in an upper end position. The sash 13 has two windows 14, 15 which can be moved horizontally in the embodiment shown, so that for operating a structure in the trigger chamber even with the sash closed 13 an operator after moving a window 14, 15 can reach into the trigger chamber.

As the figure can be further seen, the discharge chamber is bounded at the bottom by a plate 16 between the side walls 11, 12. The plate 16 may be formed as a suitable table top 16 of a resistant material. In the present case, the table top 16 consists of a chipboard with a resistant coating.

Downwardly adjacent to the table top 16, an installation panel 17 is arranged, which carries a plurality of fittings 18. In the figure, for better clarity, only one fitting 18 is provided with a reference numeral. Fittings 18 may be for example taps, gas taps or switches for the exhaust air control. Under the installation panel 17, a lower cabinet 19 is arranged in the embodiment shown.

In the withdrawal chamber are laterally, the side walls 11, 12 adjacent baffles 20, 21 are arranged. The baffles 20, 21 are plate-shaped and arranged obliquely in the drawing chamber. As a result, the cross section of the discharge chamber tapers in the rear region. The baffles 20, 21 also serve to receive sockets 22 and outlets 23. The outlets 23 serve to provide water and other fluid media, such as process gases.

On the back side, a guide plate 24 is arranged in the draw-off chamber, which adjoins the guide plates 20, 21 laterally. In its lower region, the guide plate 24 has recesses 25, 26, so that in the lower region gaps in the region of the recesses 25, 26 between the guide plate 24 and the baffles 20, 21 remain. The guide plate 24 also ends a distance from the table top 16 spaced so that a gap 27 remains between the table top 16 and the guide plate 24. Further, 24 stand rod holder 28 are arranged in the region of the guide plate. In the embodiment shown, six support rod holders 28 are provided. The support rod holders 28 serve in addition to the possibility of attachment for support rods also for fastening the guide plate 24 to a rear wall of the trigger 10, not shown in the figure.

Fig. 2 shows the section A - A of Fig. 1 , As can be seen from the figure, the trigger 10 has a take-off chamber 29. Also visible in the figure is a rear wall 30 arranged adjacently to the guide plate 24. Between the rear wall 30 and the guide plate 24 an exhaust air duct 31 is formed. In the upper region of the guide plate 24, a guide plate 32 is provided which forms an exhaust manifold 33 together with the rear wall 30. The exhaust manifold 33 communicates with an exhaust port 34, which is connectable to the top with an exhaust duct not shown in the figure. The exhaust air manifold 33 is in fluid communication with the Abluftleitkanal 31 and a discharge chamber 29 arranged on the Abluftleitkanal 35 in fluid communication.

The withdrawal chamber 29 is bounded at the top by a cover 46 arranged below the exhaust air duct 35. At the end remote from the exhaust manifold 33 Abluftleitkanales 31 adjacent to an exhaust duct 36 is disposed in the region of the cover 46 and the actuating opening, which is in communication with the Abluftleitkanal 35. The exhaust duct 36 has at its lower end a guide member 37 which leaves a funnel-like opening to the discharge chamber 29 opening of the exhaust duct 36. The guide member 37 is formed as an elongated metal plate, wherein at the discharge chamber 29 facing the end of the guide member 37, a guide panel 38 is provided.

Fig. 3 shows an enlarged partial view of the front upper portion of the trigger 10 with the exhaust duct 36, the guide member 37 and the guide panel 38. As can be seen from the figure, the guide member 37 and the guide panel 38 are integrally formed, wherein the guide panel 38 to the cover 46th is angled out.

How is the Fig. 2 can be seen, the sash 13 is formed in two parts in the illustrated embodiment. In detail, the sash 13 has an upper slide part 39 and a lower slide part with the windows 14, 15. At the lower end of the slide part 39, a spoiler 40 is arranged. Likewise, at the lower end of the slide member with the windows 14, 15 also a spoiler 41 is arranged. The spoiler 41 is directed inwardly into the discharge chamber 29 and has at its end facing away from the discharge chamber 29 end an inflow 42. The inflow 42 is associated with an inflow 43, which is formed on the front edge of the table top 16. The inflow profiles 42, 43 cause an acceleration of the air flow in the region of the actuation opening and thus a rapid removal of pollutants from the region of the actuation opening. As the figure can be further seen, the side walls 11, 12 each have a guide profile 47, wherein in the Fig. 2 only the guide profile 47 of the side wall 12 can be seen. Fig. 3 shows guide grooves 48, 49 in the region of the guide profile 47, in which the two parts of the sash 13 are guided displaceably.

How the next Fig. 2 can be seen, in the area of the table top 16, a spout 44 is arranged. An outlet of the spout 44 is not shown in the figure for clarity. Further to be seen in the figure is a Z-profile 45 which is fixed in the region of the side wall 12. This Z-profile 45 is used for suspending components of the trigger 10. Thus, in the figure, a support structure of the table top 16 is suspended in the Z-profile 45.

Fig. 4 shows a plan view of the trigger 10 in a schematic representation. As can be seen from the figure, a lamp 50 is arranged in the region of the cover 46. It can also be seen in the figure that two exhaust air ducts 35 are respectively arranged adjacent to the side walls 11, 12 and are in fluid communication with the exhaust air duct 36 and the exhaust air manifold 33, respectively.

In the figure can also be seen that the baffles 20, 21 with the side walls 11, 12 each installation channels 51, 52 form. In addition, in the figure, a damper 53 for a fall protection of the sash 13 is shown. The damper 53 is in the illustrated embodiment, an adjustable pneumatic damper, with which a drop of the sash 13 at a Accident by hanging not shown in the figure counterweights for the sash 13 or an upsetting of the sash 13 by bursting the discs 14, 15 prevent an explosion or deflagration.

Fig. 5 shows a sectional view of the trigger 10 with a plan view of the table top 16. As can be seen from the figure, a blocking element 54 is disposed in a central region between the guide plate 24 and the rear wall 30. As a result, two lateral Abluftleitkanäle 31 are arranged between the guide plate 24 and the rear wall 30, which are in fluid communication with the exhaust manifold 33 and the gaps between the guide plate 24 and the baffles 20, 21 and the table top 16. In addition, adjacent to the side walls 11, 12 of the actuating opening spoiler 59 are arranged. The spoilers 59 are shown in cross section in the figure and extend over the height of the actuating opening.

Fig. 6 shows an enlarged partial view of the guide profile 47. As can be seen from the figure, the guide profile 47 in addition to the grooves 48, 49 has a further groove 55 which is closed by a closure 56. The shutter 56 is made of the same material as the guide profile 47 and formed integrally therewith. In this case, the closure 56 has a lower material thickness than the guide profile 47. Laterally, the closure 56 adjacent to the edges of the groove 55 predetermined breaking points 57 on. In the state shown, the groove 55 is closed, so that contamination is reliably prevented here. However, if things are to be arranged in the groove 55, such as a third slide part, the shutter 56 can be easily removed by pushing. The material ruptures along the predetermined breaking points 57, so that the groove 55 is then opened.

In the Fig. 6 It can also be seen that the guide profile 47 has an inflow profile 58 on its front side. By means of this inflow profile 58, a good inflow behavior into the actuation opening of the trigger 10 is ensured.

• Wie sich beispielsweise der Fig. 2 entnehmen läßt, wird durch die Betätigungsöffnung in die Abzugkammer 29 hineinströmendes Gas zunächst entlang der Tischplatte 16 zu dem Spalt 27 und den Spalten im Bereich der Rücksprünge 25, 26 angesaugt. Dabei bewirkt das Sperrelement 54 eine gute Verteilung der Abluftwirkung zu dem Spalt 27 und den Spalten im Bereich der Rücksprünge 25, 26. Wie durch einen Pfeil angedeutet, strömt nicht abgesaugte Luft an der Leitplatte 24 aufwärts. Dabei wird durch die Leitbleche 20, 21 und die durch diese hervorgerufene Querschnittsreduzierung der Abzugkammer 29 im hinteren Bereich die Strömung beschleunigt und somit stabilisiert. Gegebenenfalls nach Art einer Nährströmung an den Seitenwänden 11, 12 zur Betätigungsöffnung zurückströmende Luft wird von den Spoilern 59 in Fig. 5 zurück ins Innere der Abzugkammer 29 gelenkt.

The operation of the trigger 10 is explained in more detail below with reference to the figures:

• How, for example, the Fig. 2 can be seen, is sucked through the actuating opening into the drawing chamber 29 gas flowing first along the table top 16 to the gap 27 and the gaps in the region of the recesses 25, 26. In this case, the blocking element 54 causes a good distribution of the exhaust effect to the gap 27 and the gaps in the region of the recesses 25, 26. As indicated by an arrow, not sucked flows Air on the guide plate 24 upwards. In this case, the flow is accelerated and thus stabilized by the baffles 20, 21 and caused by this cross-section reduction of the discharge chamber 29 in the rear area. Optionally, in the manner of a Nährströmung on the side walls 11, 12 back to the actuating opening air is from the spoilers 59 in Fig. 5 directed back into the interior of the drawing chamber 29.

In the upper area, the air flow is then, as also indicated by an arrow, deflected on the guide plate 32 and directed forward. The air flow in the interior of the discharge chamber 29 then sweeps along the cover 46 in the direction of the guide element 37. In this case, the guide diaphragm 38 causes a direction of the suction effect from the exhaust air duct 36 just opposite to the flow. The gases are then sucked through the exhaust air duct 36 and the Abluftleitkanal 35 into the exhaust manifold 33 and then transported out through the exhaust port 34 from the trigger 10. How is the Fig. 2 can further be seen, the flow is conducted in the interior of the discharge chamber 29 such that gas particles not passed into the exhaust duct 36 passed from the spoiler 40 back into the interior of the discharge chamber 29 and entrained again by the upward flowing gas to the guide member 37. Also, gas particles not diverted from the spoiler 40 then go down to the spoiler 41, which in turn deflects them back into the interior of the withdrawal chamber 29. Subsequent flow of air through the actuating opening leads these gas particles deflected so again upwards to the guide member 37 and the exhaust air duct 36. As is apparent from the above explanations, in the trigger 10, the formation of a flow roll in the interior of the discharge chamber 29 is just not suppressed. Rather, it is attempted by the measures described to stabilize the flow roll at least up to the guide member 37 and optionally not sucked pollutants again and again to lead back into this so stabilized flow roll. In this way results with low exhaust air flow a high flow rate with a safe removal of pollutants from the actuating opening.

LIST OF REFERENCE NUMBERS

10

deduction

11

Side wall

12

Side wall

13

sash

14

window

15

window

16

plate

17

installation panel

18

fitting

19

cabinet

20

baffle

21

baffle

22

sockets

23

outlets

24

baffle

25

return

26

return

27

gap

28

Stand rod holder

29

exhaust chamber

30

rear wall

31

Abluftleitkanal

32

baffle

33

exhaust manifold

34

exhaust port

35

Abluftleitkanal

36

exhaust duct

37

guide element

38

management panel

39

slide part

40

spoiler

41

spoiler

42

inflow profile

43

inflow profile

44

Spout

45

Z-profile

46

cover

47

guide profile

48

groove

49

groove

50

lamp

51

installation channel

52

installation channel

53

damper

54

blocking element

55

groove

56

shutter

57

Breaking point

58

inflow profile

59

spoiler

Claims (11)

1. Fume hood with an extraction chamber that includes side walls (11, 12), a closable access opening, a floor (16) and a cover (46), and with an extraction opening for drawing off exhaust air from the extraction chamber, wherein the extraction opening is located in the proximity of the cover (46) and in the proximity of the access opening, and a guide element (37) facing away from the access opening is attached to the extraction opening, characterised in that the guide element (37) has guiding means (38) for guiding the exhaust stream along the cover (46).
2. Fume hood according to Claim 1, characterised in that the exhaust opening is designed as an elongated exhaust slit that extends over the width of the access opening.
3. Fume hood according to Claim 1 or 2, characterised in that the guide element (37) is designed in the shape of a funnel, and the guiding means (38) advantageously possess a spoiler.
4. Fume hood according to one of the previous Claims, characterised by an exhaust distributor (33) in an area of the cover (46) facing away from the exhaust opening, said distributor being preferably in fluid contact with the exhaust opening, and/or is arranged in the proximity of a rear wall (30) of the exhaust chamber and which has a cross section that tapers towards the floor.
5. Fume hood according to one of the previous Claims, characterised by exhaust directing means (24) for directing the exhaust stream to additional exhaust openings (27), wherein the exhaust directing means (24) preferably stand in fluid contact with the exhaust distributor (33), and/or possess an exhaust directing plate (24) that is spaced apart from the rear wall (30) of the exhaust chamber, and forms, together with said wall, an exhaust channel (31) that is divided in particular in two lateral channel sections (31).
6. Fume hood according to Claim 5, characterised in that the exhaust directing plate (24) in its area close to the floor (16) possesses the additional exhaust openings (27), wherein the exhaust directing plate (24) preferably ends at a distance from the floor (16) in order to form the additional exhaust openings (27),the exhaust directing plate (24) in particular possesses lateral offsets (25, 26) in order to form the additional exhaust openings, and/or the additional exhaust openings (27) are U-shaped.
7. Fume hood according to one of the previous Claims, characterised by flow directing means (20, 21, 32) for directing the air stream in the exhaust chamber, wherein the flow directing means preferably have flow directing elements (20, 21, 32) in the rearward area of the exhaust chamber, the flow directing elements (20, 21) form, in particular with the lateral walls (11, 12) and the rear wall, installation channels (51, 52), wherein said installation channels (51, 52) advantageously have a triangular cross section.
8. Fume hood according to Claim 7, characterized in that the flow directing elements (20, 21) possess supply terminals (22, 23) for fluid media, electricity and/or data cables, and/or that the flow directing elements (32) along with the cover (46) and the rear wall (30) form the exhaust distributor (33), and/or that the flow directing elements possess a spoiler (40, 41) in the area of the access opening in order to return the air flow into the extraction chamber (29), wherein the spoiler (59) is preferably located on the side wall (11, 12) in proximity to the access opening.
9. Fume hood according to one of the previous Claims, characterised by a frontal sliding window (13) for closing the access opening, wherein the spoiler (40, 41) is preferably located on the frontal sliding window (13), said frontal sliding window (13) is in particular made of two parts, and said spoiler (40) is arranged on the upper part (39), and/or by a fall arrester (53) for the frontal sliding window (13), wherein the fall arrester preferably has a pressurised gas spring and/or a pneumatic damper (53) that in particular is adjustable.
10. Fume hood according to Claim 9, characterised in that the fall arrester is located in the proximity of the cover (46) and the frontal sliding window (13), and/or that a guide profile (47) is provided for the frontal sliding window (13), wherein the guide profile (47) preferably has at least one guide groove (48, 49) and at least one additional groove (55), and that said additional groove (55) is sealed towards the external side with a low material thickness.
11. Fume hood according to one of the previous Claims, characterised by a modular construction, preferably by a Z-profile (45) held by frame connectors (11, 12), into which the modular elements can be hooked.

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