CA1174105A - Method of controlling auxiliary air in horizontal sash fume hood - Google Patents
Method of controlling auxiliary air in horizontal sash fume hoodInfo
- Publication number
- CA1174105A CA1174105A CA000366648A CA366648A CA1174105A CA 1174105 A CA1174105 A CA 1174105A CA 000366648 A CA000366648 A CA 000366648A CA 366648 A CA366648 A CA 366648A CA 1174105 A CA1174105 A CA 1174105A
- Authority
- CA
- Canada
- Prior art keywords
- sash
- damper
- set forth
- fume hood
- auxiliary air
- 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.)
- Expired
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- Devices For Use In Laboratory Experiments (AREA)
Abstract
METHOD OF CONTROLLING AUXILIARY AIR IN HORIZONTAL SASH FUME HOOD
ABSTRACT OF THE DISCLOSURE
A method of controlling the flow of auxiliary air for dispensing into a room containing the fume hood or dispensing directly into the fume hood. By horizontally sliding a sash of the fume hood, a sash passage is altered inversely to a dispensing opening between the auxiliary air system and the fume hood.
ABSTRACT OF THE DISCLOSURE
A method of controlling the flow of auxiliary air for dispensing into a room containing the fume hood or dispensing directly into the fume hood. By horizontally sliding a sash of the fume hood, a sash passage is altered inversely to a dispensing opening between the auxiliary air system and the fume hood.
Description
BACKGROUN D
~ilany laboratory fume hoods use an auxiliary air source from outside the building in which the fume hood is located. This auxiliary air supply is directed either internally into the fume hood or externally into the room so that the auxiliary air can be swept into the fume hood along with other room air. Thepurpose of the auxiliary air supply is to reduce the amount of either heated or cooled room air being drawn into the fume hood and exhausted through the fume hood's exhaust system. An example of an auxiliary air type fume hood is described in the Turko et al Patent 3,747,504. In this patent, a vertically movable sash functions to open and close an internal dispensing opening between the auxiliary air supply and the fume hood. When the sash is up, auxiliary air is dispensed in the room, and conversely, when the sash is down, auxiliary air is dispensed directly into the fume hood.
The simple auxiliary air control system described in Turko et al works only for vertically movable sash type fume hoods. In horizontally movable sash type fume hood's control of auxiliary air flow is a much more difficult problem.The Nelson Patent 3,604,333 attempts to solve this problem by an elaborate duct work system that has dampers coupled to horizontally sliding sashes. These dampers (such as 26a, 26b, and 26c) open and close in passage between the auxiliary air distribution chamber and duct work leading to a room air dispensing.
Because the dampers moved in direct relationship to the sashes; i.e., the dampers opened as the sash is opened and closed as the sash is closed, elaborate duct work was required. This duct work was necessary to bring the auxiliary air in behind the dampers, control its flow direction out through the dampers (when open) directly above the sashes, and then direct the auxiliary air out through duct work into the room. When the horizontal sashes were closed, the auxiliary air behind the dampers passed through other bypass ports to a chamber in front of the dampers and is returned back through a port directly over the sashes. Essentially all of the complicated duct work above the fume hood was required for the
~ilany laboratory fume hoods use an auxiliary air source from outside the building in which the fume hood is located. This auxiliary air supply is directed either internally into the fume hood or externally into the room so that the auxiliary air can be swept into the fume hood along with other room air. Thepurpose of the auxiliary air supply is to reduce the amount of either heated or cooled room air being drawn into the fume hood and exhausted through the fume hood's exhaust system. An example of an auxiliary air type fume hood is described in the Turko et al Patent 3,747,504. In this patent, a vertically movable sash functions to open and close an internal dispensing opening between the auxiliary air supply and the fume hood. When the sash is up, auxiliary air is dispensed in the room, and conversely, when the sash is down, auxiliary air is dispensed directly into the fume hood.
The simple auxiliary air control system described in Turko et al works only for vertically movable sash type fume hoods. In horizontally movable sash type fume hood's control of auxiliary air flow is a much more difficult problem.The Nelson Patent 3,604,333 attempts to solve this problem by an elaborate duct work system that has dampers coupled to horizontally sliding sashes. These dampers (such as 26a, 26b, and 26c) open and close in passage between the auxiliary air distribution chamber and duct work leading to a room air dispensing.
Because the dampers moved in direct relationship to the sashes; i.e., the dampers opened as the sash is opened and closed as the sash is closed, elaborate duct work was required. This duct work was necessary to bring the auxiliary air in behind the dampers, control its flow direction out through the dampers (when open) directly above the sashes, and then direct the auxiliary air out through duct work into the room. When the horizontal sashes were closed, the auxiliary air behind the dampers passed through other bypass ports to a chamber in front of the dampers and is returned back through a port directly over the sashes. Essentially all of the complicated duct work above the fume hood was required for the
-2- ~
auxiliary air con~rol. This is substanti;llly different thall t:he simple duct wor~ at a frollt of the Tur~o et al .~uxilia~y air fume hood.
SUMMARY OF THE INV~NTION
The present invention overcomes the above problems with control-].ing auxiliary air in fume hoods with llorizontally slidable saslles. The fume ilood includes an auxiliary air supply with one dispensing opening directly into the fume hood and a room dispensing openirlg. The horizontal-ly sli.dable sash is coupled to a damper that opens and closes the dispensing opening between the auxiliary air supply and t}-le fume hood in an inverse manner to the closing and opening of the hori~ontal sash. Thus, as the sash opens, the damper closes and vice versa. This inverse rela-tionship permits very simple duct work without the need for complicated routing of the auxiliary air.
~EEAT~D APPLICATIONS
The following co-pending, co-owned applications are related.
"liorizontal Sash Fume Hood With Auxiliary ~ir Control", filed December 12, 1980, S N. 366~637, Zboralski; "Fume Hood With Dual Room Air Inlet Systems", filed Decernber 12. 1980, S.N. 366,6477 Zboralski; and "Method of Controlling Room Air Flow Into A Fume Hood", filed December 12~ 1980, S,N. 366,636 Zboralski.
THE DRAWINGS
Figure 1 is a front elevational view of a first ~mbodiment of the fume hood with auxiliary air supply system;
Figure 2 is a front elevational view of the fume hooù similar to Figure 1, but with the auxiliary air duct removed;
auxiliary air con~rol. This is substanti;llly different thall t:he simple duct wor~ at a frollt of the Tur~o et al .~uxilia~y air fume hood.
SUMMARY OF THE INV~NTION
The present invention overcomes the above problems with control-].ing auxiliary air in fume hoods with llorizontally slidable saslles. The fume ilood includes an auxiliary air supply with one dispensing opening directly into the fume hood and a room dispensing openirlg. The horizontal-ly sli.dable sash is coupled to a damper that opens and closes the dispensing opening between the auxiliary air supply and t}-le fume hood in an inverse manner to the closing and opening of the hori~ontal sash. Thus, as the sash opens, the damper closes and vice versa. This inverse rela-tionship permits very simple duct work without the need for complicated routing of the auxiliary air.
~EEAT~D APPLICATIONS
The following co-pending, co-owned applications are related.
"liorizontal Sash Fume Hood With Auxiliary ~ir Control", filed December 12, 1980, S N. 366~637, Zboralski; "Fume Hood With Dual Room Air Inlet Systems", filed Decernber 12. 1980, S.N. 366,6477 Zboralski; and "Method of Controlling Room Air Flow Into A Fume Hood", filed December 12~ 1980, S,N. 366,636 Zboralski.
THE DRAWINGS
Figure 1 is a front elevational view of a first ~mbodiment of the fume hood with auxiliary air supply system;
Figure 2 is a front elevational view of the fume hooù similar to Figure 1, but with the auxiliary air duct removed;
- 3 -i 1 ~ o ~
Figure 3 is a side elevational view of the fume hood schematically showing the auxiliary air path in the fume hood of Figure 2 with sashes closed;
Figu~e 4 is a front elevational view of the fume hood with right s&sh partially open;
5Figure 5 is a left end schematic view of the fume hood showing the auxiliary air path of the fume hood in Figure 4;
Pigure 6 is a front elevation view of the fume hood showing the right sash completely open;
Figure 7 is a front elevational view of the fume hood showing the left 10and right end sashes open;
Figure 8 is a side elevational schematic view of the fume hood showing the auxiliary air path of the fume hood of Figure 7;
Figure 9 is a front elevational view of the fume hood with left and right center panels open;
15Figure 10 is a front elevational view of the fume hood with left center and right end sash panels open;
Figure 11 is a front elevational view of the fume hood with only right center sash panel open;
Figure 12 is a front elevational view of a second embodiment of the 20fume hood with both sash panels closed; and Figure 13 is a front elevational view of the second embodiment of the fume hood with right sash panel open.
DETAILEl) DESCRIPTION
Figure 1 shows a laboratory fume hood with an auxiliary air source 1 that leads into a front duct 2 for distributing the auxiliary air across the width of the fume hood. The fume hood in the first embodiment shown in Figure 1 has horizontally slidable sashes 3, 4, 5, and 6. These sashes are preferably of glass and are transparent, but vertical dotted lines are used in the drawings to show that sash 4 and sash 6 are located in front of sash 3 and sash 5.
In Figure 2, the front duct 2 has been removed to expose the wall panel 7 shown partially cut away in Figure 3. Wall panel 7 segregates an auxiliary air chamber 8 at a front of the fume hood. It can readily be seen that the duct work for auxiliary air chamber 8 is extremely simple. The schematic showing of the fume hood in Figure 3 has a typical baffle system shown in dotted line at 9 and an exhaust duct 10.
With all sash panels closed as in Figure 2, sash 4 is shown with a connecting bar member 12, located against an abutment 13 on horizontal sliding damper 14. Because sash 4 is wider than damper 14, sash panel 4 can horizontallymove between abutment 13 and abutment 15 on damper panel 14 without moving the damper panel. When sash panel 4 is in the position shown in Figure 2, a dispensing opening 16 between the auxiliary air chamber 8 and an interior of thefume hood is open. Likewise, a dispensing opening 17 into the fume hood is also open. As can be seen, sash panel 6 has its own bar member which can laterally slide between abutment members on a damper 18. When the bar member contacts such abutment members, it thereafter slides the damper along with the sash panel.
In Figure 4, the right end panel 6 has been partially opened, which in turn partially closes the dispensing opening 17. Dispensing opening 16 remains open because sash panels 3 and 4 are in the positions shown in Figure 4. In Figure '5 5, the auxiliary air is directed through dispensing openings 16 and 17 directly into the fume hood's interior. There is also an external dispensing opening designated at 20, which is located outside the fume hood and through which auxiliary air can enter the room containing the fume hood. Thus, as the fume hood draws in room air, it will also draw in a portion of the auxiliary air to reduce the loss of heated or cooled room air. With the sash panel positions shown in Figure 6, it can be seen that the completely opening of sash panel 6 automatically causes damper panel 18to completely close off dispensing opening 17. Dispensing opening 16 above panel4 remains open.
When both left and right end sash panels are open as shown in Figure 7, sash panel 4 is directly in front of sash panel 3. Also, sash panel 6 is directly in front of sash panel S. Here sash panel 3 has a bar member 22 that engages an abutment member (not shown) on damper panel 23. Damper panel 23 is located behind wall panel 7 and slidingly moves with sash panel 3 in much the same way damper panel 14 moves with sash panel 4. As shown in Figures 7 and 8, with both dispensing openings 16 and 17 being fully closed, all auxiliary air dumps into the room containing the fume hood and is sucked into the open sashes.
When the two center sash panels are open as illustrated in Figure 9, damper panel 14 closes dispensing opening 16 and damper panel 25 is moved by a bar member 26 on sash panels 5 when sash panel 5 is movea to the right directly behind sash panel 6. Damper panel 25 has laterally spaced abutment members (not shown) projecting from its rear surface for contacting bar member 26. It should be recognized that damper panel 25 is behind wall panel 7.
In still another opening configuration of Figure 10, the left center and right end sash panels are opened. This causes damper panel 14 to close off dispensing passage 16 and damper panel 18 to close off dispensing opening 17.
Thus, all of the auxiliary air is dispensed into the room containing the fume hood.
Figure 11 shows an opening configuration in which the right center sash panel is open. ~lere damper panel 25, located behind wall panel 7, is movedby sash panel 5 to close off dispensing opening 17. Sash panel 5 is located directly behind sash panel 6. Dispensing opening 16 remains open so that the auxiliary air is proportioned between direct flow into the fume hood and dispenseà into the room containing the fume hood.
In the above Figures 1-11, a first embodiment of the fume hood has been illustrated which has four independently slidable horizontal sash panels. In Figures 12 and 13, a second embodiment of the invention is shown which has two independently slidable horizontal sash panels. In Figure 12, sash panels 40 and 41 are closed so that a damper panel 42 is moved to expose a dispensing opening 43 directly into the fume hood. In Figure 13, sash panel 41 is moved to the left and il3 in front of sash panel 40. This causes damper panel~t to move to the left and cover dispensing opening 43.
The sash panels and damper panels can slide along a track system shown generally as 45. Preferably, the sash panels are suspended from rollers that ride along track system 45 and damper panels, such as 42, have rollers at their base for riding in such track system.
In the foregoing description, specific examples have been used to describe the invention. However, it is understood by those skilled in the art that certain modifications can be made to these examples without departing from the spirit and scope of the invention.
Figure 3 is a side elevational view of the fume hood schematically showing the auxiliary air path in the fume hood of Figure 2 with sashes closed;
Figu~e 4 is a front elevational view of the fume hood with right s&sh partially open;
5Figure 5 is a left end schematic view of the fume hood showing the auxiliary air path of the fume hood in Figure 4;
Pigure 6 is a front elevation view of the fume hood showing the right sash completely open;
Figure 7 is a front elevational view of the fume hood showing the left 10and right end sashes open;
Figure 8 is a side elevational schematic view of the fume hood showing the auxiliary air path of the fume hood of Figure 7;
Figure 9 is a front elevational view of the fume hood with left and right center panels open;
15Figure 10 is a front elevational view of the fume hood with left center and right end sash panels open;
Figure 11 is a front elevational view of the fume hood with only right center sash panel open;
Figure 12 is a front elevational view of a second embodiment of the 20fume hood with both sash panels closed; and Figure 13 is a front elevational view of the second embodiment of the fume hood with right sash panel open.
DETAILEl) DESCRIPTION
Figure 1 shows a laboratory fume hood with an auxiliary air source 1 that leads into a front duct 2 for distributing the auxiliary air across the width of the fume hood. The fume hood in the first embodiment shown in Figure 1 has horizontally slidable sashes 3, 4, 5, and 6. These sashes are preferably of glass and are transparent, but vertical dotted lines are used in the drawings to show that sash 4 and sash 6 are located in front of sash 3 and sash 5.
In Figure 2, the front duct 2 has been removed to expose the wall panel 7 shown partially cut away in Figure 3. Wall panel 7 segregates an auxiliary air chamber 8 at a front of the fume hood. It can readily be seen that the duct work for auxiliary air chamber 8 is extremely simple. The schematic showing of the fume hood in Figure 3 has a typical baffle system shown in dotted line at 9 and an exhaust duct 10.
With all sash panels closed as in Figure 2, sash 4 is shown with a connecting bar member 12, located against an abutment 13 on horizontal sliding damper 14. Because sash 4 is wider than damper 14, sash panel 4 can horizontallymove between abutment 13 and abutment 15 on damper panel 14 without moving the damper panel. When sash panel 4 is in the position shown in Figure 2, a dispensing opening 16 between the auxiliary air chamber 8 and an interior of thefume hood is open. Likewise, a dispensing opening 17 into the fume hood is also open. As can be seen, sash panel 6 has its own bar member which can laterally slide between abutment members on a damper 18. When the bar member contacts such abutment members, it thereafter slides the damper along with the sash panel.
In Figure 4, the right end panel 6 has been partially opened, which in turn partially closes the dispensing opening 17. Dispensing opening 16 remains open because sash panels 3 and 4 are in the positions shown in Figure 4. In Figure '5 5, the auxiliary air is directed through dispensing openings 16 and 17 directly into the fume hood's interior. There is also an external dispensing opening designated at 20, which is located outside the fume hood and through which auxiliary air can enter the room containing the fume hood. Thus, as the fume hood draws in room air, it will also draw in a portion of the auxiliary air to reduce the loss of heated or cooled room air. With the sash panel positions shown in Figure 6, it can be seen that the completely opening of sash panel 6 automatically causes damper panel 18to completely close off dispensing opening 17. Dispensing opening 16 above panel4 remains open.
When both left and right end sash panels are open as shown in Figure 7, sash panel 4 is directly in front of sash panel 3. Also, sash panel 6 is directly in front of sash panel S. Here sash panel 3 has a bar member 22 that engages an abutment member (not shown) on damper panel 23. Damper panel 23 is located behind wall panel 7 and slidingly moves with sash panel 3 in much the same way damper panel 14 moves with sash panel 4. As shown in Figures 7 and 8, with both dispensing openings 16 and 17 being fully closed, all auxiliary air dumps into the room containing the fume hood and is sucked into the open sashes.
When the two center sash panels are open as illustrated in Figure 9, damper panel 14 closes dispensing opening 16 and damper panel 25 is moved by a bar member 26 on sash panels 5 when sash panel 5 is movea to the right directly behind sash panel 6. Damper panel 25 has laterally spaced abutment members (not shown) projecting from its rear surface for contacting bar member 26. It should be recognized that damper panel 25 is behind wall panel 7.
In still another opening configuration of Figure 10, the left center and right end sash panels are opened. This causes damper panel 14 to close off dispensing passage 16 and damper panel 18 to close off dispensing opening 17.
Thus, all of the auxiliary air is dispensed into the room containing the fume hood.
Figure 11 shows an opening configuration in which the right center sash panel is open. ~lere damper panel 25, located behind wall panel 7, is movedby sash panel 5 to close off dispensing opening 17. Sash panel 5 is located directly behind sash panel 6. Dispensing opening 16 remains open so that the auxiliary air is proportioned between direct flow into the fume hood and dispenseà into the room containing the fume hood.
In the above Figures 1-11, a first embodiment of the fume hood has been illustrated which has four independently slidable horizontal sash panels. In Figures 12 and 13, a second embodiment of the invention is shown which has two independently slidable horizontal sash panels. In Figure 12, sash panels 40 and 41 are closed so that a damper panel 42 is moved to expose a dispensing opening 43 directly into the fume hood. In Figure 13, sash panel 41 is moved to the left and il3 in front of sash panel 40. This causes damper panel~t to move to the left and cover dispensing opening 43.
The sash panels and damper panels can slide along a track system shown generally as 45. Preferably, the sash panels are suspended from rollers that ride along track system 45 and damper panels, such as 42, have rollers at their base for riding in such track system.
In the foregoing description, specific examples have been used to describe the invention. However, it is understood by those skilled in the art that certain modifications can be made to these examples without departing from the spirit and scope of the invention.
Claims (12)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of controlling air flow into a fume hood having a horizontally slidable sash, a damper, an auxiliary air system with an internal dispensing opening into the hood and an external dispensing opening outside the hood and a bar member on one of the sash or damper that moves between two laterally spaced abutment members on the other of the sash and damper comprising the steps of:
a) horizontally sliding the sash to change an air passage into the hood; and b) through such movement of the sash causing a damper to alter the size of the internal dispensing opening in an inverse manner to the change in the sash passage.
a) horizontally sliding the sash to change an air passage into the hood; and b) through such movement of the sash causing a damper to alter the size of the internal dispensing opening in an inverse manner to the change in the sash passage.
2. A method as set forth in Claim 1, wherein opening the sash causes the internal dispensing opening to close.
3. A method as set forth in Claim 1, wherein closing the sash causes the internal dispensing opening to open.
4. A method as set forth in Claim 1, wherein progressive opening and closing of the sash causes the damper to progressively close and open a dispensing opening.
5. A method as set forth in Claim 4, wherein the sash can travel a given horizontal distance before moving the damper, whereby the total travel of the sash is greater than the damper travel to accommodate a sash that is wider than the damper.
6. A method as set forth in Claim 1, wherein the bar member is on the sash and the abutment members are on the damper.
7. A method as set forth in Claim 1, wherein the damper moves laterally across the internal dispensing opening.
8. A method as set forth in Claim 7, wherein the damper moves in a horizontal path approximately parallel to the sash's travel.
9. A method as set forth in Claim 1, wherein there are a plurality of sashes, each coupled to and moving its own damper.
10. A method as set forth in Claim 1, wherein there are two sashes moving two dampers.
11. A method as set forth in Claim 9, wherein there are four sashes moving four dampers.
12. A method as set forth in Claim 1, wherein the auxiliary air system is located outside of the hood with auxiliary air flow entering the hood through the internal dispensing opening.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10366679A | 1979-12-14 | 1979-12-14 | |
| US103,666 | 1979-12-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1174105A true CA1174105A (en) | 1984-09-11 |
Family
ID=22296397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000366648A Expired CA1174105A (en) | 1979-12-14 | 1980-12-12 | Method of controlling auxiliary air in horizontal sash fume hood |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1174105A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5241788A (en) * | 1992-08-18 | 1993-09-07 | Kewaunee Scientific Corporation | Cable sash interlock |
-
1980
- 1980-12-12 CA CA000366648A patent/CA1174105A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5241788A (en) * | 1992-08-18 | 1993-09-07 | Kewaunee Scientific Corporation | Cable sash interlock |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |