DE202016002566U1 - Ring-shaped exhaust air inlet - Google Patents

Abstract

Ringfömige inflow opening in a tubular exhaust duct in ventilation systems. The cross-sectional area is perpendicular to the flow direction in the tube. Thus waiving structural cross-sectional widening (diameter change) of the small and the large pipe in front of and behind the RABLE.

Description

1. Short description

This annular exhaust air inlet (called RABLE) is used in exhaust air ducts of ventilation systems and is designed for so-called spiral ducts with diameters according to standard numbers.

The installation is intended for the current exhaust air line. Essentially, this air inlet consists of two coaxial, rotationally symmetrical pipe sections, which are held by means of webs at a distance. The conception thus provides for a diameter jump. The annular opening lies around the smaller pipe section and widens in a funnel shape towards the surrounding space. The inflow funnel serves to gradually accelerate the exhaust air to the annular opening. The air flow adjustment is made by simply shaped pieces of foam, which are attached to the webs. The air velocities in the annular opening, in the small pipe in front of the RABLE and in the large pipe behind are approximately the same size. Thus, there is little or no pressure loss due to acceleration or deceleration of the air.

2. Structural details

2.1. material

• Galvanized sheet steel of different thickness depending on the size

2.2. ingredients

The small (pos. 1 in drawing 1) and the large piece of pipe (pos. 2 ) have standard numbers as inner diameter. The small pipe section is slightly longer due to the mounting and protrudes against the flow direction over the front edge of the inflow funnel (pos. 4 ). They are by means of webs (pos. 3 ) held at a coaxial distance. Depending on the size of the four to ten bars. The sheet thickness of the tubes and the webs is at least as large as that of the connected spiral ducts, so that forces of its own weight and possible tension can be absorbed by the suspension, without leading to changes in shape. The length of the webs is at least half the diameter of the large pipe section.

The exhaust opening itself has no own Aufhängemöglichkeit as tabs or angles. Probably an enclosing pipe clamp can be attached to the large pipe section.

The curved inflow funnel (pos. 4 ) describes in profile an arc of 60 ° to 90 ° with a radius R of 0.3 to 0.5 times the diameter of the large length of pipe. Thus, a guided, accelerated air movement to the pipe is possible. For manufacturing reasons, alternatively to the curvature with a fixed radius of the inflow funnel can be designed two or three times beveled.

The inflow funnel and the fittings (pos. 5 and 6 ) are attached to the inside of the pipe sections, so that the connected spiral ducts can be pushed; as is common with pipe connectors. The thickness of the positions 4 to 6 may be lower. The connected spiral ducts are pushed up to the stop of the pipe sections. The attachment usually takes place by means of tapping screws or rivets during assembly on the construction site. Separate fasteners are not necessary.

The sheet metal parts of the RABLE (pos. 1 to 6 ) are connected to each other at the factory by means of spot welding.

2.3. Air flow adjustment

The Luftmengneinstellung, if ever necessary, can be done via vertically slotted foam cuboid. Thus, the opening area is reduced. These cuboids are unloaded about twenty percent higher than the ring opening so that it clamps, and is pressed to secure the position with the slot in front of a bridge. Thus, as required, a cuboid can be set in front of each bar. The width of the cuboid is equal to the height. The material corresponds to the quality of flame retardant B1 after DIN 4202 T1 ,

3. Size graduation

The size scale depends on the standard numbers DIN 323 , With the basic series R10, a step change in the nominal widths of the small pipe section is sufficient; For the basic series R20, three increments can be used. Ratio of large pipe circuit area to small pipe circuit area: A _gr / A _kl .
R10; 1 increment A _gr / A _kl = 1.58
R20; 1 increment A _gr / A _kl = 1.26
R20; 2 increments A _gr / A _kl = 1.58
R20; 3 increments A _gr / A _kl = 2.00

Thus, the ring opening is 26%, 58% or 100% as large as the cross-sectional area of the small pipe section.

4. Special feature / novelty

• • Simple design made from material commonly used in ventilation technology
• • Low pressure loss due to first generously sized inlet funnel and secondly no further air deflection in and behind the RABLE
• • structurally related integrated diameter transition
• • easy air flow adjustment by inserting foam pieces
• • easy cleaning without removal of the RABLE possible

drawing explanations

Drawing 1 Example for 200-250 RABLE without scale lower part in side view, above the symmetry line in section

Legend

• D:

  Diameter of large pipe section (tolerance standard number minus two millimeters)

  d:

  Diameter of the small blank (tolerance standard number minus two millimeters)

  l _S:

  Length of the bars

  l _gR :

  Length of the large piece of pipe

  l _kR :

  Length of the small pipe section

Dimensions d = 200 mm, D = 250 mm l _S = ½D = 125 mm also larger size possible l _gR = 170 mm also larger size possible l _kR = 270 mm also larger size possible R = 0.4D = 100 mm also larger size possible Drawing 2 Side view to drawing 1 without scale Drawing 3 Front view to drawing 1 without scale Drawing 4 spatial sketch without scale

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• DIN 4202 T1 [0008]
• DIN 323 [0009]

Claims (2)

Ringfömige inflow opening in a tubular exhaust duct in ventilation systems. The cross-sectional area is perpendicular to the flow direction in the tube. Thus waiving structural cross-sectional widening (diameter change) of the small and the large pipe in front of and behind the RABLE. Slotted foam cuboid for air volume reduction for insertion in the annular opening in front of the webs.

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