Inlet nozzle for fans

Abstract

The inlet nozzle for fans has a securing part (1) and an annular wall (3) connected to it, on which at least one protruding pressure connection (18) is provided. In order to be able to provide the pressure connection (18) in a more simple and reliable manner and at low cost, it is formed as a single piece with the inlet nozzle. In this way, additional assembly steps for attaching the pressure connection (18) can be avoided. The pressure connection (18) is provided directly during the manufacturing of the inlet nozzle. This avoids manufacturing and assembly costs as well as possible rejects due to the assembly process. No assembly devices are required, which would lead to increased costs of manufacturing the inlet nozzle. Given that the pressure connection (18) is part of the inlet nozzle, no additional storage locations need to be provided for the pressure connections (18).

Description

[0001] Inlet nozzle for fans

[0002] The invention relates to an inlet nozzle for fans according to the preamble of claim 1.

[0003] Fan inlet nozzles often require pressure tapping. For this purpose, the medium flowing through the inlet nozzle, usually air, is drawn in over a certain contour / angle. For this purpose, at least one pressure connection is provided, which acts as a type of valve through which the pressure of the medium flowing through the inlet nozzle is recorded. The flow volume of the medium can be calculated from the pressure. A blind rivet nut with a hose nozzle is riveted to the annular wall of the inlet nozzle as the pressure connection. In another known design, a straight screw-in nozzle is screwed into a blind rivet nut with a round shank. In both cases, an additional assembly process is required during manufacture of the inlet nozzle to attach the pressure connection to the annular wall. The assembly of the pressure connection is not reliable because the riveting can lead to problems. Cracks can form on the inlet nozzle in the area of ​​the pressure connection.These problems arise from the deformation of the inlet nozzle material and the strong forces that occur in the hole area where the pressure connection is attached, leading to cracks in the inlet nozzle. Furthermore, the pressure connection often does not fit neatly against the contour of the inlet nozzle, as this is usually curved. The additional assembly process, including drilling the hole for inserting the pressure connection, results in considerable additional costs. Furthermore, this makes installation complicated and prone to failure.

[0004] The invention is based on the object of designing the inlet nozzle according to the invention in such a way that the pressure connection can be provided in a simple, reliable, and cost-effective manner. This object is achieved in the generic inlet nozzle according to the invention with the characterizing features of claim 1.

[0005] In the inlet nozzle according to the invention, the pressure connection is formed integrally with the inlet nozzle. This eliminates the need for additional assembly steps for attaching the pressure connection. The pressure connection is provided directly during the manufacture of the inlet nozzle. This eliminates manufacturing and assembly costs, as well as potential scrap due to the assembly process. No assembly fixtures are required, which would increase the cost of manufacturing the inlet nozzle. Since the pressure connection is part of the inlet nozzle, no additional storage space is required for the pressure connections.

[0006] The inlet nozzle with pressure connection is advantageously designed as a one-piece injection-molded part. This allows the inlet nozzle to be manufactured very easily and cost-effectively using suitable plastics by injection molding.

[0007] In another advantageous embodiment, the inlet nozzle with pressure connection is designed as a one-piece die-cast part. Aluminum, for example, can be used as the material for the inlet nozzle.

[0008] Both injection-molded and die-cast parts have the advantage that the inlet nozzle and pressure connection can be manufactured in a single process or in a single shot. Once the inlet nozzle is removed from the corresponding mold, the inlet nozzle is already finished and does not need to be subsequently fitted with the pressure connection.

[0009] Advantageously, the pressure port has a passage that widens toward the outlet or inlet opening. This shape of the passage ensures easy demolding from the respective mold.

[0010] This is advantageously achieved if the pressure connection has an outer side that preferably tapers conically in the direction of the outlet opening.

[0011] Advantageously, the outer side of the pressure connection can have two outer sections with different outer diameters. This makes it possible, on the one hand, to achieve a high degree of rigidity of the pressure connection at the transition to the annular wall of the inlet nozzle. On the other hand, the outer diameter of the pressure connection can be selected so that standardized pressure extraction hoses can be attached to the pressure connection. The section with the smaller outer diameter extends from the outlet opening of the pressure connection toward its inlet opening.

[0012] Advantageously, the outer sections merge into one another via a radial, circumferential shoulder. This shoulder can then serve as a stop when attaching the pressure tapping hose, allowing the pressure tapping hose to be pushed onto the pressure connection.

[0013] The transition area from the pressure port to the annular wall of the inlet nozzle is advantageously designed using a triangular tension method. This allows for high strength at the transition area between the pressure port and the annular wall of the inlet nozzle.

[0014] The subject matter of the application arises not only from the subject matter of the individual patent claims, but also from all information and features disclosed in the drawings and the description. Even if they are not the subject matter of the claims, they are claimed as essential to the invention insofar as they are novel, individually or in combination, over the prior art. Further features of the invention emerge from the further claims, the description, and the drawings.

[0015] The invention will be explained in more detail with reference to an embodiment shown in the drawings.

[0016] Fig. 1 shows a perspective view of an inlet nozzle according to the invention,

[0017] Fig. 2 partly in side view and partly in axial section the inlet nozzle according to the invention according to Fig. 1 ,

[0018] Fig. 3 shows an enlarged and perspective view of part of the inlet nozzle according to the invention with a pressure connection,

[0019] Fig. 4 shows a section through the pressure connection according to Fig. 3 in an enlarged view.

[0020] The inlet nozzle is intended for a fan, preferably a radial fan.

[0021] The inlet nozzle has a mounting flange 1, which is circular in the illustrated embodiment. Depending on the application and the design of the fan, the mounting flange 1 can also have a different shape, for example, an oval or square. Mounting openings 2 for screws and the like are advantageously evenly distributed around the circumference of the mounting flange 1, with which the inlet nozzle can be attached, for example, to a wall.

[0022] The mounting flange 1 surrounds an annular wall 3, which is advantageously formed integrally with the mounting flange 1. The mounting flange 1, located in a radial plane, surrounds an inlet opening 4 (Fig. 2), through which the fan impeller draws in air. This air flows through the inlet nozzle and reaches the fan impeller via an outlet opening 5 in a known manner.

[0023] The inlet opening 4 is defined by a conical annular wall 6, which tapers towards the outlet opening 5. The wall 6 connects the mounting flange 1 to an annular intermediate wall 7, which adjoins the conical wall 6 at an obtuse angle (Fig. 2).

[0024] The conical wall 6 adjoins the mounting flange 1 at a larger obtuse angle than the intermediate wall 7 (Fig. 2). In the axial direction, the conical wall 6 is advantageously smaller than the intermediate wall 7, whose axial width 8 is, for example, two to five times wider than the axial width 9 of the conical wall 6.

[0025] The intermediate wall 7 merges at an obtuse angle into a transition wall 10, which is adjoined by an end wall 11. The transition wall 10 is conical and forms a larger obtuse angle to the mounting flange 1 than the intermediate wall 7. The end wall 11 is cylindrical and thus, viewed in axial section, is perpendicular to the mounting flange 1.

[0026] The walls 6, 7, and 10 each have conical inner sides 12 to 14. The end wall 11 has a cylindrical inner side 15, whose inner diameter widens, preferably continuously, near the outlet opening 5 (Fig. 4). The outer side 16 of the end wall 11 is cylindrical over the entire axial width 17.

[0027] Due to the described design, the wall thickness of the end wall 11 decreases in the direction toward the outlet opening 5. Advantageously, the wall thickness decreases over an axial width 17a, which is advantageously smaller than half the axial width 17 of the end wall 11. At least one pressure connection 18 is provided on the annular wall 3, which is located on the outside of the annular wall 3 and extends outward. As shown in Fig. 1, two or more pressure connections 18 can be provided on the annular wall 3.

[0028] The pressure connection 18 serves to measure the amount of medium flowing through the inlet nozzle to the fan. Using the pressure connection 18, the pressure of the medium flowing through the inlet nozzle is measured in a known manner, and the flow volume is calculated from this.

[0029] The pressure connection 18 is formed integrally with the annular wall 3. Therefore, an additional assembly process for the pressure connection 18 is not required.

[0030] The pressure connection 18 is provided, for example, at the transition from the intermediate wall 7 to the transition wall 10 (Fig. 4). The pressure connection 18 is designed as a nozzle with a circular outline.

[0031] The pressure connection 18 has a through opening 19 which opens into the inner side 13 of the intermediate wall 7.

[0032] The opening 19 has a conical shape such that the cross-section of the opening 19 expands continuously from the inlet opening 20 in the inner side 13 of the intermediate wall 7 to the outlet opening 21 of the pressure connection 18. The inner wall 22 of the opening 19 thus lies on a conical surface and has no interruptions.

[0033] The outer side 23 of the pressure connection 18 is also conical, with the outer diameter of the outer side 23 increasing from the outlet opening 21. In the exemplary embodiment, the pressure connection 18 has two outer side sections 23a and 23b with different diameters. The two outer side sections 23a, 23b merge into one another via a circumferential shoulder surface 24. Each outer side section 23a, 23b is conical on the outside, with the outer diameter of both outer side sections 23a, 23b increasing towards the intermediate wall 7. The outer side section 23b, which has a smaller outer diameter, extends from the outlet opening 21. Approximately halfway along the length of the pressure connection 18, the outer side section 23b merges via the shoulder surface 24 into the outer side section 23a with a larger diameter.

[0034] To ensure that the pressure connection 18 has sufficient strength at the transition to the annular wall 3, the transition 25 to the intermediate wall 7 and the transition wall 10 of the annular wall 3 is provided with a bionic radius. This can be created in a known manner, for example, by constructing it using tension triangles. With the help of the tension triangles, the shape of the notches can be optimized in a known manner so that the stress concentrations there are reduced to such an extent that excessive notch stresses, which would otherwise lead to damage to the pressure connection 18, are avoided.

[0035] The transition area 25 is designed such that the material thickness at the transition from the ring wall 3 to the pressure connection 18 has a sufficiently thick wall thickness.

[0036] When tapping the pressure, a hose is pushed onto the pressure port 18. If the pressure port 18 has the shoulder surface 24, as in the illustrated and described embodiment, the hose is pushed on until it rests against this shoulder surface 24.

[0037] The inlet nozzle, including the pressure connection 18, is manufactured in one piece in an injection mold from a suitable plastic. Since the pressure connection 18 has the conical outer surface 23 and the conical opening 19, easy demolding from the injection mold is ensured. Possible materials for the inlet nozzle include plastics such as PA, ABS, or similar materials, or aluminum.

[0038] In principle, the inlet nozzle can also be manufactured in one piece from aluminum using a die-casting process. In this case, too, the described shape of the pressure connection 18 allows the inlet nozzle to be easily removed from the die-casting tool.

[0039] The inlet nozzle can therefore be manufactured completely in one shot.

[0040] No subsequent assembly work is required to create the pressure connection 18. The pressure connection 18 is integrated into the inlet nozzle, allowing the complete inlet nozzle to be easily manufactured and subsequently assembled. In particular, no assembly fixtures are required to mount the pressure connection to the inlet nozzle. Accordingly, no storage space is required, as is required for the various parts of the pressure connection in conventional pressure connections.

Claims

Claims 1 . Inlet nozzle for fans, with a fastening part (1) and an annular wall (3) connected to it, on which at least one protruding pressure connection (18) is provided, characterized in that the pressure connection (18) is formed integrally with the inlet nozzle.

2. Inlet nozzle according to claim 1, characterized in that the inlet nozzle with pressure connection (18) is designed as a one-piece injection-molded part.

3. Inlet nozzle according to claim 1, characterized in that the inlet nozzle with pressure connection (18) is designed as a one-piece die-cast part.

4. Inlet nozzle according to one of claims 1 to 3, characterized in that the pressure connection (18) has a passage (19) which widens in the direction of an outlet opening (21) or an inlet opening (20).

5. Inlet nozzle according to one of claims 1 to 4, characterized in that the pressure connection (18) has an outer side (23) which preferably tapers conically in the direction of the outlet opening (21).

6. Inlet nozzle according to claim 5, characterized in that the outer side (23) has two outer side sections (23a, 23b) with different outer diameters.

7. Inlet nozzle according to claim 6, characterized in that the outer side sections (23a, 23b) merge into one another via a radial circumferential shoulder (24).

8. Inlet nozzle according to one of claims 1 to 7, characterized in that the transition region (25) into the annular wall (3) is designed bionic with the aid of a tension triangle process.

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