FI20175375A1 - Valve for an exhaust duct - Google Patents

Abstract

A new type of valve (100) in the exhaust air pipe (200) aims at laminar flow characteristics. The shell (10) of the valve (100) has an inside diameter (X2) and 5 vent holes (20). An opening horn (40) is arranged inside the housing (10), which is adapted to be connected in a flowing connection with the outer end of the exhaust air pipe (200) and to conduct air in the flow direction (Y) towards the ventilation outlet (20). At least in part 10, the insert (30) disposed within the housing (10) and in the flow direction (Y) at a distance (Y1) from the outer end of the exhaust air conduit (200) comprises a meeting face (31) broadening in the flow direction (Y) and tapering face (32).

Description

EXHAUST PIPE VALVE

20175375 prh 27-04-2017

TECHNICAL FIELD The present invention relates to building technology. In particular, the invention relates to ventilation technology. More particularly, the invention relates to an exhaust air valve according to the preamble of claim 15 for providing a substantially laminar exhaust air flow.

PRIOR ART [0002] In particular, ventilation ducts for buildings with mechanical ventilation are typically designed with as few as 10 laminar airflows to minimize air resistance or pressure losses. As part of the quest for laminar airflow, sharp bends are avoided in the design of ventilation ducts. The same applies to a valve installed at the end of an exhaust duct which opens outside the building and serves to discharge the exhaust air from the building and prevent rain, snow, debris, small animals and other external factors from entering the ventilation duct. There are known valves, or "hats", that use exhaust hoods that extend towards the exhaust air and extend in the direction of the exhaust, with an insert above it that spreads rainwater past the horn and towards the drainage opening of the valve housing. One such valve is the VILPE® Hat-160, which provides reliable protection of the exhaust duct without compromising the flow characteristics of the ventilation duct 20. However, it would be advantageous to further reduce the pressure drop in the ventilation duct so that the ventilation machines can be driven at a lower power to improve energy efficiency.

SUMMARY One solution is a novel valve having optimized flow characteristics. An opening horn is provided inside the valve housing and provided with an air outlet, which is adapted to be coupled to a filing connection with the outer end of the exhaust air pipe and to conduct air downstream to the air outlet of the housing. At least partially inside the shell and downstream

20175375 prh 27-04-2017 The insert located at the outer end of the exhaust air pipe comprises a flow-widening contact surface and a tapered discharge surface.

More particularly, the invention is characterized by what is stated in the characterizing part of claim 1.

A new type of exhaust air valve achieves less pressure loss without compromising the protection of the pipe, which has a beneficial effect on the energy efficiency of the ventilation system. Because the ventilation unit can be run at lower power, the additional benefit is the reduced noise in the ventilation system.

BRIEF DESCRIPTION OF THE DRAWINGS In the following, some exemplary embodiments of the invention will be discussed in more detail with reference to the accompanying drawings, in which:

Figure 1 is a lateral cross-sectional view of an exhaust air valve according to one embodiment, Figure 2 is a side cross-sectional view of the exhaust air valve of Figure 1 and Figure 3 is a perspective cross-sectional view of Figure 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

DESCRIPTION As shown in Figures 1-3, the valve 100 of the exhaust air pipe 200 is intended to be installed at the outside end of the exhaust air pipe 200 outside the building. The valve 100 has a housing 10 which is adapted to engage the outer end of the exhaust air pipe 200. The shell 10 may be made of one or more parts. In the example of Figure 1, the shell 10 comprises two interlocking portions 11, 12 for ease of installation. Alternatively, the members 11, 12 may also be joined to each other by, for example, gluing, screwing, riveting or other connection. Where technically possible, a one-piece valve may also be used (not shown). The seat portion 11 engages the outer end of the exhaust air pipe 200 with a form screw or other connection and may comprise a cover 14 extending around the exhaust air pipe 200.

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At its lower end, the seat portion 11 comprises a plurality of drainage openings 50 configured to allow rainwater to enter the shell 10 out of the shell 10 without collecting water into the shell. In particular, the underside of the seat portion 11 is made from the centerline of the valve 100 for outwardly deflection to direct rainwater out of the valve housing 10. In the example of FIG.

The seat portion 11 also comprises a horn 40 disposed within the housing 10 and adapted to be coupled to a filing connection with the outer end of the exhaust air tube 200.

In the embodiment shown in Figs. 1-3, the horn 40 is a separate component coupled to the chuck member 11 by a form connection. Alternatively, the horn 40 could be shaped or otherwise joined to the cover 14 or the seam between the seat portion 11 and the cover 14, or the horn 40 could be integrated into the seat portion 11 or cover 14. The horn 40 is shaped to open downstream. Thus, the free upper end of the horn 40 is wider than the lower end connected to its exhaust air pipe 200. In this context, the flow direction is determined by the normal opening of the opening connecting to the exhaust air duct 200 of the horn 40, which in the embodiments shown in the drawings is a vertical direction. Due to installation tolerances, the flow direction Y may deviate from the vertical direction.

The mantle portion 12, coupled to the seat portion 11 of the shell 10, is designed to protect the horn 40 from environmental factors such as rain, debris and small animals. The jacket member 12 encloses a horn 40 and comprises an insert 30 disposed above the horn 40.

The insert 30 may be entirely within the housing 10 as shown in Figs. 1-3, or may extend above the housing 10 to effect an air flow (not shown). The insert 30 is designed to protect the horn 40 from environmental factors and to promote laminar flow 25 on the one hand. Thus, the insert 30 comprises a collision surface 31 that expands in the direction of flow Y and receives the air from the exhaust air pipe 200 and transmitted by the horn 40. According to one embodiment, the encounter surface 31 is convex in the flow direction Y, such as spherical or may have a variable radius shape (not shown). In other words, the lower part of the insert 30 is convex. The encounter surface 31 distributes the incoming airflow towards the shell portion 12 of the shell 10.

Specifically, the face 31 is shaped to direct the exhaust air flow transverse to the direction of flow Y toward the gap between the inner surface of the shell 10 and the insert 30 having a width X3 in the direction transverse to the direction of flow Y.

20175375 prh 27-04-2017

The insert 30, on the other hand, has a tapering face 32 in the direction of flow Y, that is, the insert 30 has a tapered top. According to the embodiment shown in the figures, the leaving surface 32 is a rounded cone at its end, but other tapered shapes, such as domes, may also be contemplated. The meeting and leaving surfaces 31, 32 meet at the circumferential outer edge of the insert 5. The outer edge is preferably shaped as a serrated drip edge 33, sharp edges separating the flowing water mass into controlled drip currents, which avoids curving the water flow toward the center line of the valve 10 and thus toward the horn 40. In other words, the drip edge 33

The upper end of the shell 10 is shaped such that an air outlet 20 is formed between the shell portion 12 and the insert 30. The air outlet 20 is thus located downstream of the outer end of the shell 10. In other words, the shell 10 is open at the top. The vent 20 is circumferential to prevent rainwater from entering the horn 40. The housing 10 also encloses a guide 13 which surrounds the leaving surface 32 of the insert 30 between the insert 30 and the shell 10. The guide 13 is a cylinder 13 according to the embodiment shown in the figures, which extends and narrows in the downstream direction Y. The guide 13 is relatively short and positioned to surround the insert 30 above it, causing minimal pressure loss. Controller 13 helps to direct rainwater away from horn 40.

In particular, the design of the valve 100 takes into account the behavior of the compressible 20 and the fluid in the duct. Thus, the mutual dimensions of the valve 100 have been developed to minimize turbulence without compromising the protection of the horn 40. According to one embodiment, for example, the ratio Y1 between the insert 10 and the outer end of the exhaust air pipe 200 to the inside diameter X2 of the casing is 0.4 or more. For example, when valve 100 is dimensioned for a 125 mm exhaust air pipe 200 having an X4 of 25 125 mm, the ratio Y1 / X2 is of the order 0.6. When valve 100 is dimensioned for a 160 mm exhaust air pipe 200 having an X4 of 160 mm, the ratio Y1 / X2 is of the order 0.5. As the ratio increases, the distance of the insert 30 from the exhaust pipe 200 becomes long, whereby the exhaust air flow in the valve 100 can only proceed gently by rotating the insert 30. For the same purpose, according to one embodiment, the insert 30 is disposed in the flow direction Y at a distance Y2 from the horn 40 such that the ratio Y2 between the insert 30 and the horn 40 to the inside diameter X2 of the housing 10 is 0.1 or more, preferably 0.2 or more. For example, when valve 100 is dimensioned for a 125mm exhaust air pipe 200 having an X4 of 125mm, the ratio Y2 / X2 is of the order of 0.2. When

20175375 prh 27-04-2017 Valve 100 is dimensioned for a 160 mm exhaust air pipe 200 having an X4 of 160 mm and a ratio of Y2 / X2 of the order of 0.13. Consequently, the flow remains smooth. It is to be understood that the dimensions of actual pieces may differ from the nominal dimensions mentioned above.

On the other hand, it is advantageous to take into account the protective properties of the insert. Thus, the outside diameter X1 of the insert 30, in particular the largest outside diameter at the drop edge 32, is remarkable with respect to the inside diameter X5 of the horn 40. In one embodiment, the ratio X 1 / X 5 is 1 or more, preferably 1.2 or more. For example, when valve 100 is dimensioned for a 125 mm exhaust air pipe 200 having an X4 of 125 mm or a 160 mm exhaust air pipe 200 having an X4 of 160 mm, the ratio X1 / X5 is of the order of 1.2.

Thus, the insert 30 is wide enough with respect to the size of the horn 40. As noted in the examples above, the insert 30 need not be significantly wider than the inside diameter X5 of the horn 40.

It is also advantageous to provide a sufficiently wide gap between the insert 30 and the inner surface of the housing. According to one embodiment, the ratio X3 of the gap X3 between the insert 30 and the inner surface of the housing 10 to the inside diameter X4 of the exhaust air pipe 200 is 0.1 or more, preferably 0.2 or more. On the other hand, the ratio X3 of the gap X3 between the insert 30 and the inside surface of the shell 10 to the inside diameter X2 of the shell 10 is 0.05 or more, preferably 0.1 or more.

INDUSTRIAL USEFUL The conventional valve was compared to a valve implemented in one embodiment in a flow simulation in which the flow characteristics of a conventional valve and one embodiment of the valve designed for a 125 mm exhaust air pipe are shown in

Parameter Conventional valve Valve according to one embodiment Y2 / X1 [mm] - 0.2 Y 2 / X 2 - 0.13 Y2 / Y1 - 0.3 Y1 / X2 - 0.5

X3 / X4 0.3 0.2 X3 / X2 0.15 0.1 X1 / X5 1.44 1.5 pressure drop [Pa] 14.3 10.1

The parameters Y2 / X1, Y2 / X2, Y2 / Y1 and Y1 / X2 are missing in the table column Conventional valve because it lacks an insert with a convex contact surface. However, the insert had a downwardly tapering outlet face, as in the valve of reference embodiment 5. As can be seen from the table above, a new type of valve can achieve almost 30% less pressure drop than a conventional valve.

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LIST OF REFERENCE NUMBERS

10 shell 11 seating portion 12 a sheath 13 guide 20 air outlet 30 insert 31 interface for a 32 trailing 33 the drip edge 40 horn 50 water outlet 100 valve 200 exhaust pipe XI the outer diameter of the insert X2 the inside diameter of the shell X3 the width of the gap between the inner surface of the shell and the insert X4 the inside diameter of the exhaust air pipe X5 the inside diameter of the outer end of the horn Y flow direction Y1 distance between the insert and the outer end of the exhaust pipe Y2 distance between insert and horn

Claims (12)

An exhaust air pipe valve (100) adapted to engage the outer end of an exhaust air pipe (200), comprising: a casing (10) having an inside diameter (X 2) and a vent (20), - an opening horn (40) disposed within the housing (10) and adapted to be engageable with the outer end of the exhaust air tube (200) and to conduct air in a flow direction (Y) towards the outlet (20) of the housing (10), and an insert (30) disposed at least partially within the housing (10) and in a flow direction (Y) at a distance (Y1) from the outer end of the exhaust air pipe (200), characterized in that the insert (30) comprises: an interface (31) extending in the direction of flow (Y), and - a downstream (Y) tapering surface (32), An exhaust valve (100) according to claim 1, wherein the ratio of the distance (Y1) between the insert (10) and the outer end of the exhaust pipe (200) to the inside diameter (X2) of the housing is 0.4 or more, preferably 0.5 or more. Exhaust air valve (100) according to claim 1 or 2, wherein the housing (10) is open at the top. An exhaust air valve (100) according to claim 1, 2 or 3, wherein 20175375 prh 27-04-2017 The interface (31) is convex in the flow direction (Y). The exhaust air valve (100) according to any one of the preceding claims, wherein the insert (30) is disposed in the flow direction (Y) at a distance (Y2) from the horn (40), wherein the ratio (Y2) of the insert (30) to The inner diameter (X2) of the 25 (10) is 0.1 or more, preferably 0.2 or more. The exhaust air valve (100) according to any one of the preceding claims, wherein the insert (30) has an outer diameter (X1) transverse to the flow direction, wherein the ratio of the outer diameter (X1) of the insert (30) to the inner diameter (X5) of the horn (40) especially 1.2 or more. The exhaust air valve (100) according to any one of the preceding claims, wherein the maximum outside diameter (X1) of the insert (30) is greater than the diameter of the mouth of the horn to prevent rainwater from passing to the horn. An exhaust air valve (100) according to any one of the preceding claims, Wherein the contact surface (31) is configured to direct the exhaust air flow transverse to the flow direction toward the gap between the inner surface of the shell (10) and the insert (30) having a width (X3) transverse to the flow direction (Y). An exhaust air valve (100) according to any one of the preceding claims, Wherein the ratio of the gap width (X3) to the inside diameter (X4) of the exhaust air pipe (200) is 0.1 or more, preferably 0.2 or more. The exhaust air valve (100) according to any one of the preceding claims, wherein the ratio of the slot width (X3) to the inside diameter (X2) of the housing (10) is 0.05 or more, preferably 0.1 or more. 15 The exhaust air valve (100) according to any one of the preceding claims, wherein the insert (30) comprises a serrated drop edge (33) in the flow direction (Y) between the contact surface (31) and the outlet surface (32). The exhaust air valve (100) according to any one of the preceding claims, wherein the flow direction (Y) in the installed configuration is vertical or substantially vertical.