Fan inlet nozzle

Abstract

The inlet nozzle for the fan has a fixed portion (1) and an annular wall (3) connected thereto, on which at least one protruding pressure connection portion (18) is installed. To provide the pressure connection portion (18) in a simpler, more reliable, and lower-cost manner, it is formed integrally with the inlet nozzle. In this way, additional assembly steps for installing the pressure connection portion (18) can be avoided. The pressure connection portion (18) is provided directly during the manufacture of the inlet nozzle. This avoids potential rejections due to manufacturing and assembly costs and assembly processes. No assembly equipment is required that could increase the manufacturing cost of the inlet nozzle. If the pressure connection portion (18) is part of the inlet nozzle, there is no need to provide an additional storage space for the pressure connection portion (18).

Description

Technical Field

[0001] The present invention relates to an inlet nozzle (injection nozzle) for a fan according to the preamble part of claim 1.

Background Art

[0002] Often, it is necessary to measure the pressure inside an inlet nozzle for a fan. For this purpose, the medium flowing through the inlet nozzle, typically air, is sucked in over a certain profile / angle. At least one pressure port (pressure connection) that forms a kind of valve for grasping the pressure of the medium flowing through the inlet nozzle is provided for this purpose. The flow rate of the medium can be calculated using the pressure. A blind rivet nut with a hose connector is riveted to the annular wall of the inlet nozzle as the pressure port. In a further known embodiment, a straight screw-in connector is screwed into a blind rivet nut with a round handle. In both cases, an additional installation process is required during the manufacture of the inlet nozzle to fix the pressure port to the annular wall. The installation of the pressure port is not a reliable process because riveting causes multiple problems. For example, cracks can form in the inlet nozzle in the region of the pressure port. Those cracks are due to the material of the inlet nozzle being deformed, resulting in a strong force that causes crack formation in the inlet nozzle in the hole region where the pressure port is fixed. In addition, since the inlet nozzle is usually curved, the pressure port often does not fully abut against the profile of the inlet nozzle. The additional installation process and hole drilling for inserting the pressure port cause a considerable additional cost. In addition, this complicates the installation and makes errors likely to occur.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The present invention is based on the purpose of designing an inlet nozzle according to the present invention such that the pressure port can be installed simply, reliably and cost-effectively.

Means for Solving the Problems

[0004] In the case of an overall inlet nozzle, this objective is achieved by the present invention having the feature portion of claim 1.

[0005] In the inlet nozzle according to the present invention, the pressure port is integrally constructed (made as one piece) with the inlet nozzle. As a result, no additional installation steps are required to fix the pressure port. The pressure port is provided directly during the manufacture of the inlet nozzle. As a result, manufacturing and installation costs and potential rejections due to the installation method are avoided. There is no need for installation equipment that could make the manufacture of the inlet nozzle more expensive. Since the pressure port is part of the inlet nozzle, there is no need to reserve additional storage space for the pressure port.

[0006] Advantageously, the inlet nozzle with the pressure port is manufactured as a single, integrated injection-molded part. Therefore, the inlet nozzle can be manufactured very simply and cost-effectively using a suitable plastic in the injection molding process.

[0007] In another advantageous embodiment, the inlet nozzle, which includes a pressure port, is manufactured as a single die-cast component. For example, aluminum may be used as the material for the inlet nozzle.

[0008] Both injection-molded and die-cast parts have the advantage that the inlet nozzle can be manufactured together with the pressure port in a single process or in one go. After the inlet nozzle is removed from the corresponding mold, it is ready for use and does not require the pressure port to be installed later.

[0009] Advantageously, the pressure port has a passage that widens toward the outlet or inlet opening. Due to the arc shape of the passage, easy removal from each mold is ensured.

[0010] For this purpose, it is advantageous for the pressure port to have an outer surface that tapers conically towards the outlet opening.

[0011] Advantageously, the outer surface of a pressure port may have two outer surface sections with different outer diameters. Ultimately, on the one hand, it is possible to make the pressure port very robust at the transition to the annular wall of the inlet nozzle. On the other hand, the outer diameter of the pressure port can be selected so that a standardized pressure measuring hose can be attached to the pressure port. The section with the smaller outer diameter extends from the outlet opening of the pressure port toward its inlet opening.

[0012] Advantageously, the outer sections transition to one another via radially extending shoulders (radially circumferential shoulders). When a pressure measuring hose is attached, these shoulders act as stoppers, allowing the hose to be pushed into the pressure port up to that point.

[0013] The transition region from the pressure port to the annular wall of the inlet nozzle is advantageously biomechanically designed using the tension triangle method. Ultimately, high strength can be achieved in the transition region from the pressure port to the annular wall of the inlet nozzle.

[0014] The subject matter of this application is evident not only from the subject matter of each claim but also from all the details and features disclosed in the drawings and specification. These details and features, even if they are not the subject matter of the claims, are claimed to be essential to the invention, either individually or in combination, insofar as they are novel beyond the prior art.

[0015] Further features of the present invention are evident from the other claims, specification and drawings.

[0016] The present invention will be described in more detail in relation to the exemplary embodiments shown in the figures. [Brief explanation of the drawing]

[0017] [Figure 1] This is a perspective view of an inlet nozzle according to the present invention. [Figure 2] Figure 1 shows an inlet nozzle according to the present invention, partially in a side view and partially in an axial cross-section. [Figure 3]An enlarged perspective view of a part of an inlet nozzle according to the present invention having a pressure port. [Figure 4] A cross-sectional view taken through the pressure port according to FIG. 3 in the enlarged view.

Mode for Carrying Out the Invention

[0018] The inlet nozzle is provided for a fan, preferably a radial fan.

[0019] The inlet nozzle has a fixed flange 1 that is circular in the exemplary embodiment. Depending on the intended use and design of the fan, the fixed flange 1 may further have another outer shape, such as an elliptical outer shape or an angular outer shape. For example, a plurality of fixing openings 2 for screws or the like that can fix the inlet nozzle to a wall are advantageously provided uniformly distributed around the outer periphery of the fixed flange 1.

[0020] The fixed flange 1 advantageously surrounds an annular wall 3 that is formed integrally (in one piece) with the fixed flange 1.

[0021] The fixed flange 1 in the radial plane surrounds an inlet opening 4 (FIG. 2), through which the impeller of the fan sucks air. This air flows through the inlet nozzle and reaches the impeller of the fan via an outlet opening 5 in a known manner.

[0022] The inlet opening 4 is bounded by a conical annular wall 6 that tapers towards the outlet opening 5. The wall 6 connects the fixed flange 1 to an annular intermediate wall 7 that is adjacent to the conical wall 6 at an obtuse angle (FIG. 2).

[0023] The conical wall 6 is adjacent to the fixed flange 1 at an obtuse angle larger than that of the intermediate wall 7 (FIG. 2). In the axial direction, the conical wall 6 is advantageously smaller than the intermediate wall 7, and its axial width 8 is, for example, 2 to 5 times wider than the axial width 9 of the conical wall 6.

[0024] The intermediate wall 7 transitions to the transition wall 10 adjacent to the end wall 11 at an obtuse angle. The transition wall 10 is conical in design and has an obtuse angle larger than that of the intermediate wall 7 with respect to the fixed flange 1. As can be seen in the axial cross-section, the end wall 11 is cylindrical and is thus perpendicular to the transition wall 10.

[0025] The walls 6, 7, and 10 each have conical inner surfaces 12 - 14. The end wall 11 has a cylindrical inner surface 15, the inner diameter of which widens near the outlet opening 5, preferably continuously (Figure 4). The outer surface 16 of the end wall 11 extends cylindrically over the overall axial width 17.

[0026] Due to the above-described design, the wall thickness of the end wall 11 decreases towards the outlet opening 5. Advantageously, the wall thickness decreases over the axial width 17a. The axial width 17a is advantageously smaller than half of the axial width 17 of the end wall 11.

[0027] At least one pressure port 18 is provided on the annular wall 3, which is provided on the outer surface of the annular wall 3 and extends outward. As shown in Figure 1, two or more pressure ports 18 may be provided on the annular wall 3.

[0028] The pressure port 18 is used to determine the amount of the medium flowing through the inlet nozzle to the fan. Using the pressure port 18, the pressure of the medium flowing through the inlet nozzle can be determined in a known manner, and the flow rate can then be calculated therefrom.

[0029] The pressure port 18 is formed integrally with the annular wall 3. Ultimately, there is no need for an additional installation process for the pressure port 18. <000​​​​​​​​​​The opening 19 has a conical design, so that the cross-section of the opening 19 extends continuously from the inlet opening 20 on the inner surface 13 of the intermediate wall 7 to the outlet opening 21 of the pressure port 18. Therefore, the inner wall 22 of the opening 19 is on a conical surface and is free from obstructions.

[0033] The outer surface 23 of the pressure port 18 also has a conical design, and the outer diameter of the outer surface 23 increases from the outlet opening 21.

[0034] In an exemplary embodiment, the pressure port 18 has two outer surface sections 23a and 23b of different diameters. The two outer surface sections 23a and 23b transition to each other via a surrounding shoulder surface 24. Each outer surface section 23a and 23b is conical on its outer surface, and the outer diameters of both outer surface sections 23a and 23b increase toward the intermediate wall 7. The outer surface section 23b, which has the smaller outer diameter, extends outward from the outlet opening 21. At approximately half the length of the pressure port 18, the outer surface section 23b transitions to the outer surface section 23a, which has the larger diameter, via the shoulder surface 24.

[0035] To ensure that the pressure port 18 has sufficient strength at the transition to the annular wall 3, the transition section 25 of the intermediate wall 7 and the transition wall 10 of the annular wall 3 are given a biomechanically engineered (very tough) radius. This radius can be created by known methods, for example, by assembly using tension triangles / tensile triangles. Using tension triangles, the notch shape can be optimized in known ways, thereby reducing stress concentration therein and avoiding excessively high notch stress that would damage the pressure port 18.

[0036] The transition region 25 is designed such that the material thickness at the transition from the annular wall 3 to the pressure port 18 is sufficiently large.

[0037] During pressure measurement, the hose is pushed into the pressure port 18. If the pressure port 18 has a shoulder surface 24 as described above and as in the illustrated exemplary embodiment, the hose is pushed until it rests on this shoulder surface 24.

[0038] The inlet nozzle, including the pressure port 18, is manufactured integrally from a suitable plastic using an injection molding die. Since the pressure port 18 has a conical outer surface 23 and a conical opening 19, easy demolding from the injection molding die is ensured. Materials considered for use for the inlet nozzle include, for example, plastics such as PA and ABS, and aluminum.

[0039] In principle, the inlet nozzle can also be manufactured integrally from aluminum during the die-casting process. In this case as well, the molding of the pressure port 18 described above allows for easy release of the inlet nozzle from the die-casting mold.

[0040] Therefore, the inlet nozzle can be manufactured completely in one go.

[0041] No subsequent installation measures are required to create the pressure port 18. The pressure port 18 is integrated with the inlet nozzle, meaning that a complete inlet nozzle can be easily manufactured and then installed. In particular, no installation equipment is required to install the pressure port into the inlet nozzle. Therefore, no storage space is required at all, which is necessary for known pressure ports for various components of the pressure port. [Explanation of Symbols]

[0042] 1. Fixing flange (fixing part) 3. Ring Wall 18 pressure ports 19 Opening (passage) 20 Entrance opening 21 Exit opening 23a, 23b Exterior sections 24 Shoulder side (shoulder) 25 Transition Area

Claims

1. In a fan inlet nozzle having a fixed portion (1) and an annular wall (3) connected thereto, the annular wall (3) having at least one protruding pressure port (18), An inlet nozzle characterized in that the pressure port (18) is integrally formed with the inlet nozzle.

2. The inlet nozzle according to claim 1, characterized in that the inlet nozzle having a pressure port (18) is manufactured as an integrally structured injection-molded part.

3. The inlet nozzle according to claim 1, characterized in that the inlet nozzle having a pressure port (18) is made as a die-cast part with an integrated structure.

4. The inlet nozzle according to any one of claims 1 to 3, characterized in that the pressure port (18) has a passage (19) that extends in the direction of the outlet opening (21) or the inlet opening (20).

5. The inlet nozzle according to any one of claims 1 to 4, characterized in that the pressure port (18) has an outer surface (23) that preferably tapers in a conical shape in the direction of the outlet opening (21).

6. The inlet nozzle according to claim 5, characterized in that the outer surface (23) has two outer surface sections (23a, 23b) having different outer diameters.

7. The inlet nozzle according to claim 6, characterized in that the outer sections (23a, 23b) transition to each other via a radially extending and surrounding shoulder (24).

8. The inlet nozzle according to any one of claims 1 to 7, characterized in that the transition region (25) in the annular wall (3) is biomechanically designed using the tension triangle method.

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