CN211082411U

CN211082411U - Protective grille and fan designed to prevent interference

Info

Publication number: CN211082411U
Application number: CN201921444511.7U
Authority: CN
Inventors: H·阿勒斯托弗
Original assignee: Ebien Peter Mulfingen GmbH
Current assignee: Ebien Peter Mulfingen GmbH; Ebm Papst Mulfingen GmbH and Co KG
Priority date: 2019-07-19
Filing date: 2019-09-02
Publication date: 2020-07-24
Anticipated expiration: 2029-09-02
Also published as: DE102019119625A1; EP3918205A1; WO2021013496A1

Abstract

The invention relates to a protective grid and a fan designed to prevent interference, the protective grid (1) having a planar-extending perforated plate (2) in which a central ring (3) is arranged and which forms a piercing opening for a part of the fan, wherein the perforated plate (2) comprises a plurality of perforations (4) distributed over its entire surface, which are arranged next to one another in a honeycomb structure. According to the utility model discloses a protection grid makes simple, compact structure, and reduces the fan and send the noise during the fan operation.

Description

Protective grille and fan designed to prevent interference

Technical Field

The utility model relates to a design is for preventing the protection grid of interference and a fan that has corresponding protection grid.

Background

In the prior art, annular protective grids for fans are known, the spacing of the coaxial rings forming such annular protective grids being chosen small enough so that the user does not touch the area where the impeller of the fan rotates.

Any protective grilles in the fan flowpath can emit noise and reduce efficiency. Furthermore, the annular protective grids are generally welded, so that their manufacture is complicated.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is an object of the present invention to provide a protective grille of simple manufacture which ensures a compact structure and reduces the noise emitted by the fan during its operation.

According to the invention, this object is achieved by: a protective grid designed to be interference-proof is provided for fastening to a fan, characterized in that it has a plane-extending perforated plate in which a central ring is arranged and which forms a piercing socket for a part of the fan, wherein the perforated plate comprises a plurality of holes distributed over its entire surface arranged next to one another in a honeycomb structure.

Preferably, the ring comprises a fastening mechanism for securing the protective grid to the fan.

Preferably, the protective grid has a coaxial ring extending along a radially outer edge of the orifice plate, the coaxial ring configured to secure the protective grid to a portion of the fan.

Preferably, a plurality of ribs extend radially outwardly from the ring in a star shape.

Preferably, the reinforcing bars have a U-shaped or rectangular cross-section.

Preferably, the cells arranged in a honeycomb structure define a vent area that is at least 70% of the total area of the orifice plate.

Preferably, the vent area is at least 80% of the total area of the orifice plate.

Preferably, the honeycomb structure is formed of a plurality of hexagonal cells.

According to the invention, this object is also achieved by: a fan is provided, which is characterized in that the fan is provided with the protective grid.

Preferably, at least a portion of the motor of the fan is disposed through the pass-through socket.

Preferably, the fan comprises an impeller and a casing ring radially surrounding the impeller, wherein the protective grating abuts against an axial end face of the casing ring.

According to the utility model discloses, a design is for preventing the protection grid of interfering for fixing to fan is proposed, and it has the orifice plate that the plane extends, has arranged the central ring piece in this orifice plate and has formed the socket that wears that is used for a part of fan. In this case, the orifice plate comprises a plurality of orifices distributed over its entire surface, arranged next to one another in a honeycomb structure.

The cells in the honeycomb structure are matched with respect to their respective flow cross-sectional areas to a number of influencing factors, such as the flow cross-sectional area of each cell or their sum, the safety distance to the moving parts, the penetration size, etc. Due to the large number of cells in the honeycomb structure, a relatively large total cross-sectional flow area is formed. The preferred shape of the aperture is an equilateral hexagon.

The perforated plate is preferably a flat plate, the material of which is formed solely by the webs separating the perforations.

In the case of the protective grid, it is further advantageously provided that the ring comprises a fastening mechanism for fixing the protective grid to the fan. The fastening means may for example be provided as screws or rivets. Also, the protective grill may be positioned on a pin provided at the fan.

In addition to the ring, a development of the protective grid provides that the protective grid has a coaxial ring extending along the radially outer edge of the perforated plate, which coaxial ring is configured to fix the protective grid to a part of the fan. The coaxial ring forms a radial end of the protective grid with the perforated plate and serves in particular to fix the protective grid to a fan casing ring surrounding the fan wheel. In a variant embodiment, the coaxial ring is formed integrally with the orifice plate.

A further development of the protective grid is characterized in that a plurality of reinforcing ribs extend outwardly in a star-shaped manner in the radial direction from the ring. The ribs preferably have a U-shaped or rectangular cross-section and extend uninterrupted from the ring to the coaxial rings. In addition, the reinforcing ribs are formed integrally with the orifice plate.

The construction of such a protective grid is aerodynamically advantageous: the cells arranged in the honeycomb structure determine an aggregate ventilation area which amounts to at least 70%, in particular at least 80%, of the total area of the perforated plate.

The utility model discloses still include a fan that has above-mentioned protection grid. In this case, the compact design is facilitated in that at least a part of the electric motor of the fan is arranged to extend through the insertion opening. For example, a shield of the motor may be used as this part of the motor.

The fan includes an impeller and, in one embodiment, a casing ring radially surrounds the impeller. The protective grid is then preferably arranged against an axial end face of the housing ring. The ring may also be arranged at least partially on both axial sides.

According to the utility model discloses a protection grid makes simple, compact structure, and reduces the fan and send the noise during the fan operation.

Drawings

Further advantageous developments of the invention are explained in more detail below with reference to the drawings and the description of preferred embodiments of the invention. In the figure:

FIG. 1 shows an axial top view of a protective grid;

FIG. 2 shows a side view of the protective grid of FIG. 1;

fig. 3 shows a perspective view of a fan with the protective grille of fig. 1.

Detailed Description

Fig. 1 and 2 show an exemplary embodiment of a protective grille 1 for fastening to a fan and designed to be interference-proof. The protective grid 1 has a planar, flat-running perforated plate 2, on substantially the entire surface of which perforations 4 are distributed, which are arranged next to one another in a honeycomb structure. The perforations 4 are hexagonal in cross-section and directly adjoin one another so that the total cross-sectional flow area is maximized as much as possible. The protective grid 1 comprises, in the axial center, a ring 3 which, in the embodiment shown, extends on both axial sides of the perforated plate 2. But the ring 3 may also be arranged on only one axial side. Six continuous ribs 9, which are formed by the perforated plate 2 and each have a U-shaped cross section, extend in a star-shaped manner from the ring 3, see also fig. 3. In its region, the perforated plate 2 is correspondingly configured with a U-shaped projection. The number of ribs 9 can be adjusted as desired, but should be at least three.

The ring 3 has a plurality of openings 7 as fastening means for fastening the protective grid 1 to the fan. For example, a fastening pin may be inserted through the opening 7. The ring 3 also defines an insertion opening 8 for a portion of the fan.

A coaxial ring 5, which is not provided with an eyelet 4, is coaxial with the ring 3 and is integral with the orifice plate 2 at the radially outer edge of the protective grid 1. In an alternative embodiment, the coaxial ring 5 is arranged as an additional component on the axial side of the perforated plate 2.

Referring to fig. 3, a fan 100 having the protective grill 1 of fig. 1 and 2 is shown. The fan 100 includes a motor 101 and an impeller radially surrounded by a casing 102. The shield grid 1 is placed on the axial end face of the shell ring 102. The electric motor 101 extends partially axially through the through-socket 8 and projects axially with respect to the axial plane defined by the protective grid 1. This enables the electric connection end of the electric motor to be guided axially outside the protective grid.

Claims

1. A protective grid designed to be interference-proof, the protective grid (1) being intended to be fixed to a fan, characterized in that it has a plane-extending perforated plate (2) in which a central ring (3) is arranged and which forms a through-going socket (8) for a part of the fan, wherein the perforated plate (2) comprises a plurality of perforations (4) distributed over its entire surface arranged next to each other in a honeycomb structure.

2. The protective grid designed to prevent interference according to claim 1, characterized in that said ring (3) comprises fastening means for fixing said protective grid (1) to said fan.

3. The protective grid designed to prevent interference according to claim 1 or 2, characterized in that said protective grid (1) has a coaxial ring (5) extending along the radial outer edge of said perforated plate (2), said coaxial ring being configured to fix said protective grid (1) to a portion of said fan.

4. The protective grid designed to prevent interference according to claim 1 or 2, characterized in that a plurality of reinforcing ribs (9) extend outwardly in a star shape in a radial direction from the ring (3).

5. The protective grid designed to prevent interference according to claim 4, characterized in that said reinforcing bars (9) have a U-shaped or rectangular cross section.

6. The protective grid designed to prevent interference according to claim 1 or 2, characterized in that the perforations (4) arranged in a honeycomb structure define a ventilation area which is at least 70% of the total area of the perforated plates (2).

7. The protective grid designed to prevent interference according to claim 6, characterized in that the ventilation area is at least 80% of the total area of the perforated plate (2).

8. The protective grid designed to prevent interference according to claim 1 or 2, characterized in that said honeycomb structure is formed by a plurality of hexagonal said cells (4).

9. A fan, characterized in that the fan (100) has a protective grille (1) designed to be interference-proof according to any one of claims 1 to 8.

10. The fan according to claim 9, characterized in that at least a part of the motor of the fan is arranged through the through-going socket (8).

11. The fan according to claim 9 or 10, characterized in that the fan (100) comprises an impeller and a shell ring (102) radially surrounding the impeller, wherein the protective grid (1) abuts against an axial end face of the shell ring (102).