Bend pipe for exhaust duct of range hood

Abstract

The invention relates to a pipe bend (1) for an exhaust duct of a range hood, wherein the pipe bend (1) has at least one multi-part, curved air guide element (3) which extends inside the pipe bend (1), characterized in that a first sub-element and a second sub-element (4, 5) of the air guide element (3) have a spacing (d) from one another in the radial direction (R) of their curvature.

Description

Technical Field

[0001] The present invention relates to an elbow for the exhaust duct of a range hood, wherein the elbow comprises at least one multi-part, curved air-guiding element extending within the elbow. Such an elbow is known from JP 2002-266815 A. EP 1 923 576 B1 shows a similar elbow having a single-part air-guiding element. Background Art

[0002] In such bends in exhaust ducts for range hoods and the like, it is generally desirable to keep the pressure loss in the duct as low as possible. It is known that in the area where the duct changes direction, that is, in particular in the area of ​​the bend, the expected pressure loss is particularly high. This is because, due to the deflection of the air flow in the bend, at least partially non-laminar airflow occurs in the bend due to air separation and the resulting eddies. Air separation and eddies not only lead to pressure loss but also to noise generation, which is generally undesirable and should be minimized. A first approach to addressing these issues is to use air-guiding elements, but further improvements are still desired in terms of noise generation and pressure loss reduction. Summary of the Invention

[0003] The object of the present invention is therefore to further develop a pipe bend of the type described in the introduction so that it causes the lowest possible noise generation and, moreover, has the lowest possible pressure loss for the fluids flowing through it, in particular air and smoke.

[0004] Therefore, in a pipe bend of the type described in the introduction, provision is made for the first subelement and the second subelement of the air guiding element to be spaced apart from one another in the radial direction of their curvature.

[0005] The curved air-guiding element can be constructed in two parts. Alternatively, however, the air-guiding element can also be constructed in three parts or even more parts. In a two-part embodiment, the air-guiding element is preferably divided into half lengths in the extension direction between the opposite connecting cross sections of the curved pipe, for example at the apex of the air-guiding element.

[0006] In one embodiment, the subelements can overlap each other in the overlapping region of the ends of the subelements facing each other. It can be provided that the two subelements are spaced apart from each other in the overlapping region by exactly this distance. In the overlapping region, the subelements can preferably extend parallel to each other.

[0007] In an alternative embodiment, the partial elements can be aligned with the end faces of the ends of the partial elements facing each other. Here, preferably, they do not have to be completely opposite. Instead, it can only be provided that the partial elements are aligned with their end faces in the radial direction of their curved portion.

[0008] If the elbow has a plurality of curved air-guiding elements, provision can be made for the first curved air-guiding element to have overlapping sub-elements of the type described above in the overlapping region, while the second curved air-guiding element has sub-elements whose end faces face one another and are aligned with their end faces in the radial direction of the bend. For example, the curved air-guiding element with the overlapping sub-elements can be an outer curved air-guiding element, while the curved air-guiding element with the aligned end faces can be an inner curved air-guiding element, which is arranged closer to the inner radius of the elbow than the outer curved air-guiding element and therefore has a smaller radius of curvature than the outer air-guiding element.

[0009] At least one air guiding element can extend with a first subelement to a first of two opposite connecting cross sections of the elbow. Similarly, at least one air guiding element can extend with a second subelement to a second of two opposite connecting cross sections of the elbow.

[0010] At least one of the two subelements of the curved air guiding element can have a varying radius of curvature along its extension direction toward the other subelement. Preferably, the subelement can have a radius of curvature that increases monotonically at least in sections or decreases monotonically at least in sections. Provision can be made for the two subelements to have the same radius of curvature at their ends facing away from each other. In particular, provision can be made for the two subelements to be oriented perpendicularly to the respective connecting cross section of the elbow at their ends facing away from each other.

[0011] The radius of curvature of the first of the two subelements that passes through the bend in the flow direction can increase in the flow direction, and the radius of curvature of the second of the two subelements that passes through the bend in the flow direction can decrease in the flow direction. This makes it possible, for example, for the two subelements of the air guiding element to be spaced apart in the radial direction of their curvature in the region of the opposite ends (at which the subelements are most closely spaced) despite the subelements being perpendicular to their respective connecting cross sections at one of their two ends.

[0012] It can be provided that the two radii of curvature of the first subelement and the second subelement vary identically in value or percentage in order to provide the spacing according to the invention between the subelement components.

[0013] If the air-guiding element is designed in two parts, it can be provided in particular that the first subelement and the second subelement are spaced apart from one another at the vertex of the air-guiding element.

[0014] The elbow can have at least or exactly two air-guiding elements, wherein the first air-guiding element is an air-guiding element having overlapping sub-elements, and the second air-guiding element is an air-guiding element in which the sub-elements are aligned with their end faces in the radial direction of their curvature. The first air-guiding element can have a larger average radius than the second air-guiding element. Thus, the first air-guiding element can be spaced further from the inner radius of the elbow than the second air-guiding element, which is arranged closer to the inner radius of the elbow.

[0015] The first air guiding element can divide the connection cross section of the elbow into a half facing the elbow inner wall and a half facing the elbow outer wall. Here, the second air guiding element can divide the half facing the elbow inner wall into a half facing the first air guiding element and a half facing the elbow inner wall.

[0016] The pipe bend can be designed, in particular, as a flat channel bend or as a transition bend from a rectangular flat channel connection to a round channel connection or vice versa.

[0017] It has been shown that spacing the partial elements apart in the radial direction of the bend of the air-guiding element reduces flow separation in the bend and thus suppresses the formation of turbulence in the bend, which ultimately leads to a reduction in pressure loss and noise generation in the bend compared to bends known from the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Further details of the present invention are explained with reference to the following drawings, which show:

[0019] Figure 1 A perspective and partially transparent view shows a pipe bend configured as a flat channel according to an embodiment of the present invention; and

[0020] Figure 2 Shown according to Figure 1 Detail of the elbow in the adjoining area of ​​the opposing partial elements. DETAILED DESCRIPTION

[0021] exist Figure 1 and Figure 2The embodiment of the elbow 1 according to the invention shown in FIG is designed as a flat channel and therefore has a substantially rectangular cross-section with rounded corners. The elbow 1 is therefore particularly suitable for exhaust ducts with a corresponding rectangular cross-section, as is generally known from the prior art, in order to provide an exhaust duct in a particularly space-saving manner, for example in the base of a kitchen cabinet or in the ceiling area of ​​a room, for connecting, for example, a range hood and a wall box for removing the fumes.

[0022] The elbow 1 according to the invention has two two-part, curved air-guiding elements 3, each comprising a first and a second sub-element 4, 5. According to the invention, the first and second sub-element 4, 5 of the air-guiding element 3 are spaced apart from one another in the radial direction R of the curvature of the air-guiding element 3 at a distance d from one another.

[0023] As can be seen, the subelements 4, 5 of the air guiding element 3 facing the outer wall 9 of the elbow overlap in the overlapping region 6 of the mutually facing ends 2 of the subelements 4, 5. In contrast, the two subelements 4, 5 of the air guiding element facing the inner wall 8 of the elbow 1 do not have an overlapping region. Rather, the two opposite ends 2 of the subelements 4, 5 are spaced apart in the radial direction R by the distance d according to the present invention. On the other hand, however, the subelements are aligned in the radial direction R with their opposite end faces.

[0024] The spacing d between the two partial elements 4 and 5 can be provided in such a way that, in the flow direction x of the air through the elbow 1, the curvature radius of the two first partial elements 4 increases continuously, while the curvature radius of the second partial element 5 arranged to pass through the elbow in the flow direction x decreases in the flow direction x.

[0025] The features of the invention disclosed in the above description, the drawings and the claims may be essential for the realization of the invention individually or in any combination.

[0026] Reference Signs List

[0027] 1 elbow

[0028] 2 ends

[0029] 3 Air guide elements

[0030] 4. Part I components

[0031] 5. Second Part Components

[0032] 6 Overlapping Area

[0033] 7 Connection cross section

[0034] 8 Inner wall of elbow

[0035] 9 Outer wall of elbow

[0036] R radial direction

[0037] x flow direction

Claims

1. A bend pipe (1) for an exhaust duct of a range hood, wherein: The curved pipe (1) has at least one multi-part and curved air-guiding element (3), which extends inside the curved pipe (1), characterized in that a first subelement (4) and a second subelement (5) of the air-guiding element (3) are spaced apart (d) from one another in a radial direction (R) of their curvature; The first partial element (4) and the second partial element (5) are aligned with their end faces (2) facing each other; The first sub-element (4) and the second sub-element (5) are aligned with their end faces in the radial direction (R) of their curvature.

2. The elbow (1) according to claim 1, wherein: At least one air guiding element (3) extends with a first subelement (4) to a first connecting cross section of two opposite connecting cross sections (7) of the elbow (1), and at least one air guiding element (3) extends with a second subelement (5) to a second connecting cross section of the two opposite connecting cross sections (7) of the elbow (1).

3. The elbow (1) according to claim 1 or 2, wherein: At least one of the first sub-element (4) and the second sub-element (5) has a changing radius of curvature along its extension direction toward the other.

4. The elbow (1) according to claim 3, wherein: The changing radius of curvature is a radius of curvature that increases monotonically at least in sections or decreases monotonically at least in sections.

5. The elbow (1) according to claim 3, wherein: The first sub-element (4) and the second sub-element (5) have the same radius of curvature at their ends facing away from each other.

6. The elbow (1) according to claim 3, wherein: The curvature radius of the first sub-element (4) of the first sub-element (4) and the second sub-element (5) passing through the bend (1) in the flow direction (x) increases in the flow direction (x), and the curvature radius of the second sub-element (5) of the first sub-element (4) and the second sub-element (5) passing through the bend (1) in the flow direction (x) decreases in the flow direction (x).

7. The elbow (1) according to claim 6, wherein: The two radii of curvature vary identically in value or percentage.

8. The elbow (1) according to claim 1, wherein The air guiding element (3) is of two parts, wherein the first sub-element (4) and the second sub-element (5) are spaced apart at the apex of the air guiding element (3).

9. The elbow (1) according to claim 1, wherein The curved pipe (1) has at least or exactly two air guiding elements, wherein a multi-piece and curved first air guiding element extends inside the curved pipe (1), the first air guiding element having a first sub-element (4) and a second sub-element (5), the first sub-element (4) and the second sub-element (5) of the first air guiding element having a distance (d) from each other in the radial direction (R) of their curved portion, the first sub-element (4) and the second sub-element (5) of the first air guiding element overlapping each other in an overlapping region (6) of their ends (2) facing each other and being spaced apart from each other by the distance (d) in the overlapping region, the second air guiding element being defined by the at least one multi-piece and curved air guiding element (3), the first sub-element (4) and the second sub-element (5) of the second air guiding element having end faces of their ends (2) facing each other aligned and their end faces aligned in the radial direction (R) of their curved portion.

10. The elbow (1) according to claim 9, wherein: The first air-guiding element has a larger average radius than the second air-guiding element.

11. The elbow (1) according to claim 9 or 10, wherein: The first air guiding element divides the connecting cross section (7) of the elbow (1) into a half of the elbow inner wall (8) facing the elbow (1) and a half of the elbow outer wall (9) facing the elbow (1), The second air guiding element divides the half of the inner wall of the curved pipe facing the curved pipe (1) into the half facing the first air guiding element and the half facing the inner wall of the curved pipe (1).

12. The elbow (1) according to any one of claims 1, 2, 8, 9, and 10, wherein the elbow is constructed as a flat channel bend or as a transition bend from a rectangular flat channel connection to a circular channel connection or from a circular channel connection to a rectangular flat channel connection.

Images