FI91672C - Method and apparatus for airflow distribution - Google Patents

Description

91672

Method and apparatus for airflow splitting Forfarande och anordning for att fordela en luftstrøm 5

The invention relates to a method and a device for dividing the air flow.

There have been difficulties in controlling prior art air distribution terminals with a large air discharge surface. Without a steady discharge into the room space 10 from the exhaust chamber of the air distribution terminal, it has not been possible to implement it satisfactorily. This application presents a completely new type of method and apparatus solution which is able to distribute the air flow evenly in the deaeration chamber of the terminal device and thus to adjust the amount of air flow from the low-speed device so that it is uniform over the entire air discharge surface. According to the invention, 15 variable length as well as bendable bellows are used, inside the bellows of which the air flow is first directed. Inside the bellows, the air flow is directed to the deaeration chamber of the main unit through the air flow openings at the junction of the bellows walls. From the internal deaeration chamber of the low-speed device, the air flow is further directed to the room space, for example via the perforated surface of the device.

When using the device solution according to the invention, its connection possibilities in all directions up, down, back and to the side are good. The bellows structure can be used in all types of airflow terminals. The bellows structure is quickly and easily attached to the mouth of the channel with a collar. The bellows can be removed, thus enabling the connection channel 25 to be cleaned. The bellows structure can be, for example, aluminum, in which case it is fireproof. The bellows is also unobstructed compared to, for example, filter structures known from the prior art.

The method for distributing the air flow according to the invention is mainly characterized in that the air flow is directed inside the bellows and through the air flow openings in the walls of the bellows to the exhaust chamber of the air flow device and further out of the exhaust chamber through the air distribution surface.

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The device for distributing the air flow according to the invention is mainly characterized in that the exhaust chamber of the air flow main device acts as a pressure equalizing element on the bellows, through the air flow openings of which the air flow is evenly distributed to the exhaust chamber of the air distributor and further out of the chamber.

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By means of the bellows structure, the air is evenly distributed in the exhaust chamber of the end member and the bellows thus acts as a pressure equalizer. When using the device according to the invention, the pressure level of the entire actuator can then be adjusted by changing the bellows of the inner part or by changing the flow resistance of the bellows by adjusting the length of the bellows. As the length of the bellows increases, the flow cross-sectional area of its airflow openings increases and the flow resistance of the bellows to the airflow decreases. As the bellows length is reduced, the flow resistance is increased.

The advantage of bellows can also be considered to be that the same inner part structure can be used in several different types of devices. Because the length of the bellows is adjustable, Kay 15 the same bellows section for devices of different lengths and sizes.

The invention will now be described with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, to which, however, the invention is not intended to be exclusively limited.

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Figure 1A shows an air flow terminal in which the bellows according to the invention is arranged inside the discharge chamber.

Fig. 1B is an axonometric partial cross-sectional view of the air distribution terminal of Fig. 1 25.

Figure 2 shows the connection of the bellows to the air inlet duct. The representation is a section I-I of Figure IB.

Figure 3 shows a side view of the bellows structure according to the invention in a separate view.

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Figure 4 shows the area A of Figure 3 on an enlarged scale.

Figure 5A is a section II-II of Figure 3.

Figure 5B shows another preferred embodiment of the cross-section of the bellows.

Figures 1A and IB show a preferred embodiment of a bellows drive according to the invention. The bellows 10 is arranged in the air exhaust chamber of the air distribution main device 11, i.e. in the equalization chamber 12. The function of the bellows 10 is to act as a pressure equalizer. Its function 10 is to distribute the air flow evenly in the exhaust chamber 12 so that the air also flows as evenly as possible at low speed through the perforated surface 14 into the room H. The bellows 10 is fitted with the air inlet 15 of the main unit 11 and attached to the bottom plate F.

Figure 2 shows a section I-I of Figure IB. The bellows 10 is deformable, and thus the end of the bellows can be easily inserted into the connection 15 on the side of the air distribution main device 10 and connected to it, for example, with a collar 13.

Air is introduced into the space D in the bellows 10 as shown by the arrow L} in Fig. 2 and is evenly distributed from the inside space D of the bellows 10 through the air flow openings 16al516a2 at the junction wall sections 10aj, 10a2 ... without a discharge surface 14, preferably through a perforated surface. In the bellows structure, the adjacent walls 10aj, 10a2; 10a2,10a3; The connection points P1, P2 ... between 10a3,10a4 are articulated points and the length of the bellows 25 can be changed. As the length of the bellows is increased, the adjacent walls 10a2,10a3 on each side of the hinge point Pj are positioned so that their walls separate from each other and, when the structure is shortened, the walls are placed against each other in the outer position. In this case, the air flow restrictor is at its maximum (Figures 3 and 4).

Figure 3 shows the bellows structure from the side. As shown in the figure, air is introduced into the space D by the arrow Lj and distributed through the wall structure of the bellows 10 and the air flow openings 16ai, 16a2 ... at the outer joints 4 91672 to the air outlet chamber 12 of the air distribution device 11 and further out of the outlet chamber 12.

5 In obtaining the air flow rate, the bellows 10 is stretched, whereby the flow cross-sectional area of the air flow openings 16a1 (16a2 ... in the bellows 10 is reduced. ... at the outermost rainfall points of the so-called corrugation at those points of the bellows 10 10 which are furthest from the longitudinal central axis X of the bellows The air flow is directed to the side by a jet of air.The bellows 10 encloses the end wall M, so the space D inside the bellows

Figure 4 shows the area A of Figure 3 on an enlarged scale. The air is distributed to the air outlet chamber 12 of the main device 11 and further out to the room H through the flow opening 16a „at the junction of the adjacent walls lOa ^.

Figure 5A shows a cross-section II-II of Figure 3. The cross-section 20 of the bellows 10 in the embodiment of the figure is a circle. The air flow openings I0a1,10a2 ... are evenly distributed in the circular cross-sections of the bellows 10 and along the entire length of the bellows 10.

Figure 5B shows a bellows structure 10 with a rectangular cross section, preferably a square. The bellows 10 is suitable for connection to rectangular cross-sectional ducts.

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Claims (8)

91672 Patent claims A method for distributing an air flow, characterized in that the air flow is directed inside the bellows (10) and through the air flow openings 5 (16aj, 16a2 ··.) In the bellows walls to the exhaust chamber (12) of the air flow main device (11) and further out of the exhaust chamber (12) through the discharge surface (14). Method according to Claim 1, characterized in that the amount of air flow is adjusted by changing the length of the bellows (10). 10 Method according to Claim 1 or 2, characterized in that the method uses a bellows structure in which air flow openings (16a |, 16a2 ...) are formed at the junctions of the bellows walls at the outermost edges of the bellows cross-section. (163 ^ 1632- ..) the flow cross-section and the flow restrictor, juxtaposing the adjacent walls (10a1,10a2 ...) and reducing the flow cross-sectional area of the air flow openings (16a1? 16a2 ...). An airflow distribution device, characterized in that the outlet chamber (12) of the airflow main device 20 comprises a bellows (10) as a pressure equalizing member, through which airflow openings (16aj, 16a2 ...) the airflow is evenly distributed to the outlet chamber (12) of the air distributor and further out (H) or the like. Device according to Claim 4, characterized in that the air flow openings 25 (16ai, 16a2. ··) are formed at the joints and joints (P1, P2 ...) of the bellows wall sections (10a1,10a2 ...) and at those joints which located on the outermost axis of the bellows (X). Device according to the preceding claim, characterized in that the cross section of the bellows (10) 30 is an annular wheel. 91672 Device according to one of the preceding claims, characterized in that the cross section of the bellows (10) is rectangular, preferably square. Device according to one of the preceding claims, characterized in that the bellows (10) is connected at one end to a connection (15) connected to the discharge chamber (12) of the air distribution terminal (11), for example by a collar (13) or the like. • '«t II 91672