Pipe Bend for an Exhaust Air Duct of a Fume Extraction Hood

Abstract

A pipe bend for an exhaust air duct of a fume extraction hood, the pipe bend having at least one multi-part and curved air guide element which extends in the interior of the pipe bend, characterized in that a first and a second part element of the air guide element have a spacing (d) from one another in a radial direction of their curvature.

Claims

1. A pipe bend for an exhaust air duct of a fume extraction hood, comprising: the pipe bend having at least one multi-part and curved air guide element which extends in the interior of the pipe bend, wherein a first and a second part element of the air guide element are at a distance (d) from one another in a radial direction of their curvature.

2. The pipe bend according to claim 1, wherein the partial elements overlap with each other in an overlapping area of facing ends of the partial elements.

3. The pipe bend according to claim 2, in which the two partial elements are spaced apart from one another in the overlap region by the distance (d).

4. The pipe bend according to claim 1, wherein the partial elements are aligned with their end faces of facing ends of the partial elements.

5. The pipe bend according to claim 4, in which the partial elements are aligned with their end faces in the radial direction of their curvature.

6. The pipe bend according to claim 1, wherein the at least one air guide element with the first partial element extends up to a first of two opposite connection cross-sections of the pipe bend, and wherein the at least one air guide element with the second partial element extends up to a second of two opposite connection cross-sections of the pipe bend.

7. The pipe bend according to claim 1, in which at least one of the two part elements has a varying radius of curvature along its direction of extension towards the other part element, preferably a radius of curvature which increases monotonically at least in sections or decreases monotonically at least in sections.

8. The pipe bend according to claim 7, in which the two partial elements have the same radius of curvature at their ends facing away from each other.

9. The pipe bend according to claim 7, wherein the radius of curvature of a first one of the two partial elements in the flow direction through the pipe bend increases in the flow direction and the radius of curvature of a second one of the two partial elements in the flow direction through the pipe bend decreases in the flow direction.

10. The pipe bend according to claim 9, in which the two radii of curvature change identically in amount or percentage.

11. The pipe bend according to claim 1, wherein the air guide element is in two parts, the first and second part elements having the distance at a vertex of the air guide element.

12. The pipe bend according to claim 1, wherein the pipe bend comprises a first and second guide element.

13. The pipe bend according to claim 12, wherein the first air guide element has a larger mean radius than the second air guide element.

14. The pipe bend according to claim 12, wherein the first air guide element bisects a connecting cross-section of the pipe bend into a half facing a pipe bend inner wall of the pipe bend and a half facing a pipe bend outer wall of the pipe bend, wherein the second air guide element bisects the half facing the pipe bend inner wall of the pipe bend into a half facing the first air guide element and into a half facing the pipe bend inner wall of the pipe bend.

15. The pipe bend according to claim 1, which is formed as a flat duct bend or as a transition bend from a rectangular flat duct connection to a round duct connection, or vice versa.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Further details of the invention are explained with reference to the figures below. Thereby:

[0020] FIG. 1 shows in perspective and semi-transparent view a pipe bend in the form of a flat duct according to one embodiment of the invention; and

[0021] FIG. 2 is a detailed view of the pipe bend according to FIG. 1 in the adjoining area of opposite partial elements.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] The embodiment of a pipe bend 1 according to the invention shown in FIGS. 1 and 2 is designed as a flat duct and accordingly has a substantially rectangular cross-section with rounded corners. Consequently, the pipe bend 1 is particularly suitable for exhaust air ducts which have a corresponding rectangular cross-section, as is known in principle from the prior art, in order to provide, in particular in a space-saving manner, for example in the base of a kitchen cabinet or in the ceiling area of a room, an exhaust air duct for connecting, for example, an fume extraction hood to a wall box for the discharge of vapors.

[0023] The pipe bend 1 according to the invention has two two-part and curved air guide elements 3, which each have a first and a second part element 4, 5. According to the invention, the first and the second partial element 4, 5 of the air guide element 3 have a distance d from each other in the radial direction R of the curvature of the air guide element 3.

[0024] As can be seen, the partial elements 4, 5 of the air guide element 3 facing the pipe bend outer wall 9 overlap in an overlap area 6 of the facing ends 2 of the partial elements 4, 5. Deviating from this, the two partial elements 4, 5 of the air guide element facing the pipe bend inner wall 8 of the pipe bend 1 do not have an overlap area. It is true that the two opposite ends 2 of the partial elements 4, 5 have the distance d from one another in the radial direction R according to the invention. On the other hand, however, they stand straight in the radial direction R with their opposite end faces in alignment with the radial direction R.

[0025] The distance d between the two sub-elements 4, 5 can be provided precisely by the fact that, in the flow direction x of the air through the pipe bend 1, the two first sub-elements 4 have a continuous increase in their radius of curvature, while the radius of curvature of the second sub-elements 5 arranged in the flow direction x through the pipe bend decreases in the flow direction x.

[0026] The features of the invention disclosed in the foregoing description, in the drawings as well as in the claims may be essential to the realization of the invention both individually and in any combination.