[0001] The invention relates to a suspended ceiling structure and a method for flowing air
in connection with the suspended ceiling structure.
[0002] From an earlier FI publication print 84 096 by the applicant is known a suspended
ceiling structure, in which structure impurities produced in cooking objects are prevented
by means of a capture air jet from collecting in connection with a suspended ceiling
structure and said imputities are passed to an outlet air unit of the ceiling module.
In the structure, the suspended ceiling structure comprises such an inlet air unit
related to the suspended ceiling structure, via channel opening of which inlet air
unit a carrier air and capture air jet is produced toward grease filters of the outlet
air unit.
[0003] In this application, attempts have been made to improve said orientatation of the
capture air jet to the outlet air unit. It has been observed in the invention to use
such a carrier air jet, which has been flown along with the plane surface of the ceiling
module towards the outlet air unit. Thus, it has been realized in the invention to
use a so-called Coanda-effect, in which an air jet produced in connection with the
ceiling module surface flows, when adhered to the surface of the ceiling module, tightly
along with the surface towards the outlet air unit and flows along therewith impurities
and/or overheated air produced by lower cooking equipment. In accordance with the
invention, such a device producing a capture air jet is used, from which air is released
from the plane of the ceiling surface and flown thereafter in the direction of the
plane of the ceiling surface. According to the invention, the speed of the carrier
air jet directed towards the outlet air unit and the form of its distribution figure
may be adjusted by an adjusting device.
[0004] The inventive adjusting device comprises an air chamber, which is limited by curved
surfaces limited to the air chamber. The air is preferably brought to the air chamber
from an air chamber of the inlet air device, from which inlet air chamber the air
is flown also via a separate hole surface into the room space.
[0005] The air is flown from the air chamber of the adjusting device out from between the
curved air control surface and the curved air control surface of an adjusting piece
such that the curved surface of the chamber plate controls air to flow immediately
from the ceiling surface plane of the ceiling module in the direction of the ceiling-surface
plane towards the outlet air unit. In accordance with the invention, the adjusting
piece to be moved in the air chamber is comprised of a nose portion, the tip of which
is fitted to move along with the curved inner surface of the chamber plate limiting
the chamber. The tip of the nose portion comprises a curved air flowing surface. The
adjusting piece is fitted to be manually rotated on a rotational bearing around a
central point O of the bearing and the air chamber. The adjusting piece is fitted
to be located in a counterpiece of the rotational bearing such that it is located
in an area between the central point O of the rotational bearing and a surface bounded
to the chamber plate of the rotational bearing, as the nose portion of the adjusting
piece is tangent to the curved inner air control surface of the chamber plate.
[0006] The inventive suspended ceiling structure is mainly characterized in that the suspended
ceiling comprises such means producing a capture air jet, the air-flow outlet opening
of which means is essentially located directly in the vicinity of the surface plane
of the suspended-ceiling board and that the means produced by the capture air jet
comprise an air control surface, which directs the air jet such that it flows in the
direction of the suspended-ceiling board towards an outlet air chamber of the outlet
air device.
[0007] The inventive method for flowing air in connection with a suspended ceiling structure
is mainly characterized in that air is flown from a flowing gap placed in the vicinity
of the surface plane of the suspended ceiling board bounded to the room, which flowing
gap is located by its plane essentially in the direction of the board surface of the
suspended ceiling board, and in which method air is led, directed by the inner surface
of the curved chamber plate, to be discharged from the gap such that the air flow
is given the direction of the board plane of the suspended ceiling board already at
a step when air exits via the gap.
[0008] The invention is next described with reference to certain preferred embodiments of
the invention, to which the invention is not solely intended to be limited.
[0009] Fig. 1A shows a general represantation of the inventive method and the device solution.
[0010] Fig. 1B shows an adjusting device as a side view and as a cross-sectional view.
[0011] Fig. 2 shows the adjusting device as an axonometric view before the assembly of the
parts.
[0012] Fig. 3A shows the adjusting device when assembled, and in a certain embodiment of
the adjustment, Fig. 3B shows the carrier air jet figure related to the embodiment
of Fig. 3A.
[0013] Fig. 4A shows another adjusting position of the adjusting piece of the adjusting
device.
[0014] Fig. 4B shows a flow diagram of the carrier air jet related to the position of the
adjusting piece of Fig. 4A.
[0015] According to Fig. 1A, fresh inlet air L₁ is brought to a room space H via an inlet
air device 11. The air coming from an inlet air channel 12 is flown to an inlet air
chamber 13 of the inlet air unit 11, which inlet air chamber 13 is bounded by a box
body 14. Air is flown from the inlet air chamber 13 via a channel opening 15 as a
carrier air jet L
1a towards grease filters 21 of an outlet air device 18.
[0016] The outlet air unit 18 comprises an outlet air chamber 19, which is bounded by a
case 23 of the outlet air chamber. The case 23 comprises for an outlet air flow L₂
an opening 20, which opens into an internal outlet air chamber 19 of the case structure.
In connection with the opening 20 is located a grease filter 21. The outlet air opening
20 is located on a slanting surface 24 of the case 23. The air flow is further led,
according to the figure, to an outlet air chamber 22 of the case-like outlet air chamber.
The air flow is further led via the outlet air chamber 22 out of the connection of
the structure.
[0017] According to Fig. 1A, both the inlet air unit 11 and the outlet air unit 18 are supported
on the actual ceiling structure C. In an area L between the inlet air unit 11 and
the outlet air unit 18 is located below the actual ceiling structure C a suspended
ceiling board 25. The suspended ceiling board 25 rests on the inlet air unit 11 and
the outlet air unit 18. On top of the suspended ceiling board 25 are fitted devices
for other technical equipment, such as electrical lead-ins. The air flow as the carrier
air jet L
1a occurs in the vicinity of the suspended ceiling board 25. By means of the capture
air jet L
1a, the impurities risen from the cooking equipment of the kitchen are led directly
to the filters 21. The accumulation of the impurities is thus prevented by means of
the capture air jet L
1a in the area between the inlet air unit 11 and the outlet air unit 18 to the vicinity
of the suspended ceiling structure 25.
[0018] According to Fig. 1A, air is flown to a room space H via one channel opening 16 of
the inlet air unit 11 directly downwards, as shown by an arrow L
1b. By means of a perforated plate 17, a sufficiently low flow rate is achieved for
the air flow L
1b. In this way, the feeling of draught is prevented in the working zone of the kitchen
personnel working in the kitchen space H. From the kitchen space H, the outlet air
flow is removed via the outlet air channels 22 of the outlet air device 18, as shown
by the arrow L₂, which flow is formed of the carrier air jet L
1a as well as of an impure air flow L₃ drawn along therewith.
[0019] The inventive structure is modular comprising several constant widths for the suspended
ceiling board 25. Thus, a different suspended ceiling structure arrangement may be
formed according to the need of each space. Thereby, it is possible to select the
distance between the inlet air units and the outlet air units as desired and according
to the requirements of the space.
[0020] According to Fig. 1B, the equipment comprises an adjusting device 26, by means of
which the capture air jet L
1a may be adjusted. The adjusting device 26 is fitted to the inlet air chamber 13 of
the inlet air unit 11 such that the air flows from the inlet air chamber 13 to an
air chamber E of the adjusting device. The air chamber E is bounded by curved chamber
plates 27a and 27 b. An adjusting piece 28 is fitted to the air chamber E. It is fitted
to turn in the air chamber E to the desired position such that it is caused to enter
into different covering positions relative to a gap D. The adjusting piece 28 is moved
by means of bearing means 29 (Fig. 2). The adjusting piece is connected to the bearings
means 29 such that the adjusting piece 28 is located in the air distribution chamber
E eccentrically relative to a central point O of the chamber. The adjusting piece
28 is thus located in an area between the central point O of the chamber and a curved
inner surface F of the chamber plate 27a, 27b limiting the chamber E.
[0021] A nose portion 30 of the adjusting piece 28 is located in the vicinity of the inner
surface F of the chamber plate 27a, 27b.
[0022] A curved air-flow guiding surface 31 is connected to the nose portion 30, whereby
the air flow out from the chamber E occurs along with the curved guiding surface 31
of the air flow of the adjusting piece 28 as well as along with the curved inner surface
of the chamber plate 27a.
[0023] Between the chamber plate 27a and the chamber plate 27b there is an outflow gap D,
which is located on the plane T of the sucpended ceiling board 25. The air exits from
the chamber E along with a surface portion 27a' bounded to the gap D of the chamber
plate 27a and flows thus to the vicinity of a surface plane 25' of the suspended ceiling
board 25 and further in the direction of the plane T of the suspended ceiling board.
[0024] Fig. 2 shows the adjusting device 26 as a partial viwe, as an axonometric representation
and before the assembly of the parts related to the adjusting device 26. The adjusting
device 26 comprises an end piece 32, in which a counter-bearing 29a of the bearing
means is located. The counter-bearing part 29a is formed of a flange 33 extending
from a surface plane S of the part 32, which flange is preferably a circular flange.
Around a side surface G of the flange 33 is placed a counterbearing part 29b of the
bearing means 29. The counterbearing part 29a may be rotated, guided by the surface
G, around a central point O into a desired angular position. The centre of the bearing
is located in the point O (Fig. 1B). The counterbearing part 29b comprises a flange
portion 34 extending from a surface plane S', which is also preferably a circular
flange. Around the flange portion 34 is placed the adjusting piece 28 from its end.
The circular flange 34 comprises guiding slots P₁, P₂, P₃, into which guiding notches
P₁', P₂', P₃' of the adjusting piece 28 are placed and thus keep the adjusting piece
28 in an accurate position with respect to the counterbearing part 29b of the bearing
means 29.
[0025] In accordance with the figure, the adjusting device 26 additionally comprises the
curved chamber plates 27a, 27b, which may be fixed with screws R to a frame plate
35 of the counterbearing part 29a of the bearing means 29.
[0026] Fig. 2 shows only one end of the adjusting device 26. The other end of the adjusting
device 26 is mounted with corresponding means, and the adjusting piece 28 is fixed
by corresponding means to the bearing means 29 as the first end.
[0027] Thus, when controlling the capture air jet L
1a the adjusting piece 28, when fixing to the bearing portion 29b of the bearing means
29, may be rotated by rotating said bearing means (arrow N) to a desired position
in the air chamber E of the chamber plates 27a, 27b.
[0028] Fig. 3 shows the adjusting piece 28 in a position realizing the thin capture air
jet L
1a. The air comes according to arrows M to the inlet chamber E into a space between
the chamber plates 27a, 27b and flows further from a gap D' between the adjusting
piece 28 and the chamber plate 27a, guided by an end surface 27a' of the chamber plate
27a to a surface plane 25' of the suspended ceiling board 25, and flows in the direction
of the plane T of the suspended ceiling board 25 toward the outler air unit.
[0029] Fig. 3B shows a flowing figure of the capture air jet L
1a of Fig. 3A corresponding to the position of the adjusting piece 28. By means of the
adjusting device 26, it has been possible to achieve a thin air flow just to the vicinity
of the surface plane 25' of the suspended ceiling structure 25.
[0030] Fig. 4A shows another adjusting position of the adjusting piece 28, in which the
adjusting piece 28 has been turned according to the figure in a clockwise direction
and in which the flowing gap D' from between the air guiding surface of the adjusting
piece 28 and the inner surface of the chamber plate 27a is larger than in the adjusting
position of Fig. 4A. According to Fig. 4B, a thicker air flow jet is produced toward
the grease filters 21 of the outlet air device 18.
[0031] In the inventive method, the air is first flown into the space E between the chamber
plates 27a, 27b, and from said space E from the flow route D' between the curved guiding
surface 31 of the air of the adjusting piece 28 as well as the inner surface F of
the chamber plate 27a or 27b via the gap D to the vicinity of the surface plane 25'
of the suspended ceiling board 25 and further in the direction of the plane T of the
suspended ceiling board 25 toward the outlet air unit 18. The air thus flows smoothly
in the flowing route D' between the curved guiding surface 31 of the adjusting piece
28 and the curved guiding surface F of the chamber plate 27a or 27b. The air is directed
via the curved end portion 27a' of the chamber plate 27a into the gap D and further
to the vicinity of the surface plane 25' of the suspended ceiling board 25. The flow
opening of the gap D is located by its plane S essentially in the direction of the
plane T of the suspended ceiling board 25. In the inventive method, the flow of the
carrier air jet L
1a is controlled by adjusting the distance between the curved guiding surface 31 of
the adjusting piece 28 and the chamber plate 27a or 27b by rotating the adjusting
piece 28. The invention relates to a suspended ceiling structure (10) and a method
for flowing air in connection therewith. The suspended ceiling structure is especially
intended for large-scale kitchen spaces and is formed of modular units, which comprise
at least an inlet air unit (11) and an outlet air unit (18) and in an area therebetween
a suspended ceiling board (25). The suspended ceiling structure comprises means producing
a capture air jet (L
1a), whereby the air jet may be brought to flow in the direction of a plane (T) of the
suspended ceiling board (25) toward an outlet air opening (20) of the outlet air flow
(L₂), whereby the capture air flow (L
1a) draws an impure air and/or excess heat or excess moisture risen from the the impurity
source of the room space toward the outlet air unit (18). The suspended ceiling structre
(10) comprises such means producing the capture air jet (L
1a), the air-flow dischage opening (D) of which means is located essentially directly
in the vicinity of a surface plane (25') of the suspended ceiling board (25) and that
the means producing the capture air jet (L
1a) comprise an air guiding surface (27a'), which orientates the air jet such that it
flows in the direction of the plane (T) of the suspended ceiling board (25) toward
the outlet air chamber (19) of the outlet air unit (18).
1. A suspended ceiling structure (10), which is especially intended for large-scale kitchen
spaces and is formed of modular units, which comprise at least an inlet air unit (11)
and an outlet air unit (18) and in an area therebetween a suspended ceiling board
(25), and which suspended ceiling structure is formed below an actual ceiling structure
(C) of the room, whereby a free space (E) remains between the suspended ceiling structure
(10) and the actual ceiling (C) of the room, and which suspended ceiling structure
(10) comprises an inlet air chamber (12) for a fresh-air flow (L₁) to be brought to
the room, which inlet air chamber (12) is connected to a body frame (14) limiting
the inlet air chamber, from which inlet air chamber (11) opens at least one flow opening
for the air flow coming to the room, and which suspended ceiling structure comprises
an outlet air unit (18), which comprises a case-like frame (23), which limits inside
it an outlet air chamber (19), whereby an opening for the outlet air flow (L₂) opens
into the outlet air chamber (19) from the room space, which opening comprises in its
connection grease filters (21), and whereby the outlet air chamber (19) is fitted
to be located in the suspended ceiling structure above the cooking means located in
the room space, and which suspended ceiling structure (10) comprises a modularily
mountable suspended ceiling board (25), whereby at least one suspended ceiling board
(25) is fitted in an area between the inlet air unit (11) and the outlet air unit
(18), and that the suspended ceiling structure (10) comprises means producing a capture
air jet (L1a), whereby the air jet may be brought to flow in the direction of a plane (T) of the
suspended ceiling board (25) toward an outlet air opening (20) of the outler air flow
(L₂), whereby the capture air flow (L1a) draws an impure air and/or excess heat or excess moisture risen from the the impurity
source of the room space toward the outlet air unit (18), which prevents the accumulation
of the impurities and/or excess heat and/or excess moisture in an area between the
inlet air unit (11) and the outler air unit (18) in the vicinity of the suspended
ceiling board (25) of the suspended ceiling structure, characterized in that the suspended ceiling structure (10) comprises such means producing the capture
air jet (L1a), the air-flow dischage opening (D) of which means is located essentially directly
in the vicinity of a surface plane (25') of the suspended ceiling board (25) and that
the means producing the capture air jet (L1a) comprise an air guiding surface (27a'), which orientates the air jet such that it
flows in the direction of the plane (T) of the suspended ceiling board (25) toward
the outlet air chamber (19) of the outlet air unit (18).
2. A suspended ceiling structure according to Claim 1, characterized in that the surface portion (27a') directing the air flow relates to the curved chamber
plate (27a), which limits together with the adjusting piece (28) of the adjusting
device (28) therebetween a flow gap, from which the air flows to the vicinity of the
suspended ceiling board (25).
3. A suspended ceiling structure according to Claim 1 or 2, characterized in that there is an adjusting device (26), by means of which it is possible to adjust
the location of the adjusting piece (28) of the adjusting device in the air chamber
(E) limited by the curved chamber plates (27a, 27b), into which chamber (E) the air
is first flown and from which the air is further flown from between the adjusting
piece (28) and the curved chamber plate (27a or 27b) to the vicinity of the surface
plane (T) of the suspended ceiling board (25).
4. A suspended ceiling structure according to any of the preceding Claims, characterized in that the adjusting piece (28) comprises at its end bearing means (29), on which
the adjusting piece (28) may be turned into different adjusting positions for producing
a desired air flow profile (L1a) via the gap (D) below the suspended ceiling board (25).
5. A suspended ceiling structure according to any of the preceding Claims, characterized in that the adjusting piece (28) is fitted into the air chamber (E) into an an air
space (E) bounded by the chamber plates (27a, 27b) such that the adjusting piece (28)
is located in an area between the central point (O) of the chamber (E) and an inner
surface (F) of the the chamber plate (27a, 27b) and such that a nose portion (30)
of the adjusting piece (28) is located in the vicinity of the inner surface (F) of
the chamber plate (27a or 27b).
6. A suspended ceiling structure according to any of the preceding Claims, characterized in that the nose portion (30) of the adjusting device (26) comprises a curved air-flow
guiding surface (31), whereby the guiding surface (31) of the adjusting piece (28)
together with the curved inner surface of either of the chamber plates (27a or 27b)
forms therebetween an air flow route (D'), via which the air is flown from the gap
(D) to the vicinity of the surface plane 25') of the suspended ceiling board (25)
and flown in the direction of the plane (T) of the suspended ceiling board (25).
7. A suspended ceiling structure according to any of the preceding Claims, characterized in that the adjusting device (26) comprises an end piece (32), in which a counterbearing
part (29a) of the bearing means (29) is located, which counterbearing part (29a) is
formed of a circular flange (33) extending from the surface plane (S) of the part
(32), around a side surface (G) of which circular flange (33) is placed a counterbearing
part (29b) of the bearing means (29), which will be located around the side surface
(G) of the flange (33).
8. A suspended ceiling structure according to the preceding Claim, characterized in that the counter-bearing part (29b) may be turned, guided by the side surface
(G) of the flange (33), around the central point (O) of the chamber and the bearing
into a desired angular position, whereby the adjusting piece (28) fixed to the counter-bearing
part (29a) obtains the desired adjusting positions.
9. A suspended ceiling structure according to the preceding Claim, characterized in that the counter-bearing part (29a) comprises a flange portion (34) extending
from the surface plane (S), which flange portion (34) is preferably a circular flange,
and around the flange portion (34) is placed from its end the adjusting piece (28).
10. A suspended ceiling structure according to any of the preceding Claims, characterized in that the chamber plates (27a, 27b) open from their both ends, whereby the adjusting
device (26) is placed in the inlet air unit (11) such that the air chamber (E) of
the adjusting device opens into the inlet air chamber (13) of the inlet air unit (11),
whereby via the inlet air unit (11) are produced both the capture air jet (L1a) and the normal fresh-air inlet air jet (L1b), preferably via a perforated surface.
11. A method for flowing air in connection with a suspended ceiling structure (10) comprises
an inlet air unit (11) and an outlet air unit (18) as well as a suspended ceiling
board (25) therebetween, and which units (11, 18) are mounted below the actual ceiling
(C) of the room space, whereby a free space (E) remains between the suspended ceiling
structure (10) and the actual ceiling (C) of the room space, and which suspended ceiling
structure (10) is supported on the actual ceiling (C) of the room space, and in which
method air is flown via the inlet air unit (11) to the room space (H) such that it
is directed from the inlet air unit (11) at a fairly high speed in the direction of
the plate plane (T) of the suspended sealing board (25), characterized in that the air flown to the vicinity of the surface plane limiting to the room of
the suspended ceiling board (25) from the flowing gap (D), which is located by its
plane essentially in the direction of the plate plane (T) of the suspended ceiling
board (25) and in which method the air is guided, directed by the inner surface (F)
of the curved chamber plate (27a or 27b), from the gap (D) such that an orientation
of the plate plane (T) of the suspended ceiling board (25) is given to the air flow
already at a step when the air exits via the gap (D).
12. A method according to the preceding Claim, characterized in that air is flown form between the curved air guiding surface (31) of the adjusting
piece (28) and the curved inner surface (F) of the chamber plate (27a or 27b) via
the gap (D) to the room space (H).
13. A method according to Claim 11 or 12, characterized in that the flow of the carrier air jet is controlled by adjusting the distance between
the inner surface (F) of the chamber plate (27a, 27b) and the air guiding surface
(31) of the adjusting piece (28).
14. A method according to any the preceding Claims 11-13, characterized in that the distance between the inner surface (F) of the chamber plate (27a or 27b)
and the adjusting piece (28) is changed by turning the adjusting piece (28) on the
bearing means (29).
15. A method according to any the preceding Claims 11-14, characterized in that the air is flown (arrow M) first to a space (E) between the chamber plates
(27a, 27b) and from the space (E) via the gap (D) to the vicinity of the inner surface
of the suspended ceiling board and to flow in the direction of the plane (T) of the
suspended ceiling board (25) toward the outlet.