EP3253969A1

EP3253969A1 - Fan having outer electronics

Info

Publication number: EP3253969A1
Application number: EP16739481.6A
Authority: EP
Inventors: Malte Pils; Thomas Heli; Peter Riegler; Jörg GÜNTHER
Original assignee: Ebm Papst Mulfingen GmbH and Co KG
Current assignee: Ebm Papst Mulfingen GmbH and Co KG
Priority date: 2015-07-24
Filing date: 2016-07-18
Publication date: 2017-12-13
Also published as: CN205078469U; US10570918B2; US20180128285A1; WO2017016912A1; DE102015112106A1

Abstract

The invention relates to a fan, comprising a fan housing and a motor accommodated therein, which has a stator and a rotor, which is connected to a fan wheel, wherein the fan housing consists of at least a housing upper part and a housing lower part and the housing upper part has an axial opening, on the axial inner face of which facing the housing lower part the stator is arranged and on the axial outer face of which at least electronics are arranged.

Description

Fan with external electronics

Description:

The invention relates to a fan and a motor accommodated therein with a stator and a rotor which is connected to a fan wheel, wherein the fan housing is formed from at least one upper housing part and a lower housing part.

For blowers driven by electronically commutated motors, a motor with integrated motor control electronics is usually used. The engine control electronics are regularly housed in an electronics housing, which connects directly to the engine body. It is disadvantageous that an exchange of engine control electronics in case of service due to their inaccessibility is not possible or only with great installation effort.

The electronics housing is formed sealed at a direct connection between the engine and motor control electronics, since it is located within the funded by the fan medium. The possibility of cooling the engine control electronics is thus severely limited. Furthermore, a construction of the motor with motor control electronics connected thereto and accommodated in an electronics housing leads to an increased axial space requirement within the fan housing.

Also, the manufacturability of a favorable for this use plastic-pressed stator is limited to small sizes with relatively small diameter, whereby the size of the circuit board for the electronics and the predictable number of electronic components is limited.

From the patent application DE 10 2010 012 392 A1, for example, a fan representing the state of the art is known.

The invention is therefore an object of the invention to provide a fan for the integration of engine and engine electronics in the

Fan housing has a smaller axial space requirement and provides accessibility to replace the electronics in the service needs.

These objects are achieved by a feature combination according to claim 1. According to the invention, a fan is proposed for this purpose, which is formed from at least one upper housing part and a lower housing part

Fan housing and a motor accommodated therein with a stator and a rotor which is connected to a fan wheel comprises. The

Housing upper part further has an axial opening, at the to the

Housing lower part facing axial inside of the stator and at the axial outer side at least one electronics is arranged. The axial direction is defined as an extension parallel to the motor axis or fan wheel axis. The motor is in particular an electronically commutated external rotor motor with a plastic-pressed stator located in the interior of the

Fan housing is located within the medium to be pumped and the fan wheel drives. The electronics are preferably applied to a printed circuit board which extends perpendicular to the axial direction.

According to the invention, the stator and the electronics are connected to the

Housing upper part of two axial sides attached, the electronics from the axial outside, the stator from the axial inside, to the

Housing bottom has. Although the wall of the upper housing part separates the electronics from the stator, it is in the

Housing top provided an immediate connection to the stator. By placing the electronics outside of the housing top, i. outside the fan housing and thus outside of the medium to be conveyed by the fan eliminates the need to use a sealed electronics housing. In addition, the electronics are accessible from the outside of the fan housing and interchangeable, without the fan would have to be dismantled.

In an advantageous embodiment, it is further provided that the electronics is a motor control electronics for electronically commutated drive of the motor or a unit of motor control electronics with adjacently arranged electronics for supplying external consumers. The electronics for supplying external consumers includes functions for operating an external consumer, in particular an output for supplying power to an external consumer and an input for communication with the external consumer. The possibility of connecting the electronics to supply other external consumers is made possible by attaching the electronics axially on the outside of the housing upper part and the associated accessibility from the outside.

In the embodiment according to the invention is also favorable that the Housing upper part forms a part of the electronics housing and thus can be dispensed with an additionally provided electronics housing. The axial space requirement for the electronics housing is saved, since it is partially provided by the upper housing part itself. In addition, can be increased by the use of the upper housing part as electronics housing, the diameter of the electronics or the circuit board and a flatter axial structure of the electronics can be realized.

Further, an embodiment is advantageous in which the motor control electronics contacted by the axial opening of the upper housing part without a lead to the stator and is detachably connected to the stator. The direct and, for example via contact pins conduction-free contacting of the motor control electronics to the stator has the advantage that the winding heating can be detected directly on sensors on the electronics and the Entstörungsaufwand is reduced, since no additional connecting lines are required.

In an advantageous embodiment variant, the stator has a connecting ring, by means of which it can be fastened axially and / or radially against a peripheral edge of the axial opening. The contacting between the stator arranged on the inside to the housing upper part and the electronics arranged on the outside to the housing upper part can thus take place via the axial opening, while the stator is mounted on the peripheral edge of the axial opening via the connecting ring.

Also favorable is an embodiment of the fan in which the connecting ring has a peripheral step, which constitutes an axial abutment surface and a radial abutment surface for abutment with the edge of the axial opening. Furthermore, a bearing surface is formed parallel to the radial extent of the axial opening, on which the electronics can be fastened directly. The support surface extends on the connecting ring, preferably radially inwardly to the stage. The support surface is conveniently flat, so that the electronics applied to the printed circuit board can be arranged in parallel. In addition, the study Fe preferably formed such that the bearing surface of the connecting ring is flush with a radially adjoining surface of the upper housing part. The axial and radial contact surfaces of the connection ring offer the possibility of attaching the connection ring to the peripheral edge of the axial opening, so that the axial contact surface lies axially on the inside of the wall of the upper housing part and the radial contact surface on the inside of the wall of the axial opening of the upper housing part. The connecting ring with the stator connected thereto projects in this embodiment in sections into the axial opening. The invention is in a further advantageous embodiment, characterized in that the housing upper part has a cup-like in the axial direction inwardly recessed central portion, within which the axial opening provided and the electronics is arranged. The countersunk central portion is provided substantially centrally in the upper housing part, wherein the shape of the fan housing in the radially adjoining outer peripheral region can be arbitrarily adapted to the fluidic requirements, for example spirally. In a favorable embodiment, the electronics are received in the axial and radial direction completely in the recessed central portion, so that the upper housing part form both the bottom surface and the side walls of the electronics housing. This protects the electronics and does not protrude axially from the fan housing.

To cover the electronics, a plate is preferably arranged on the upper housing part, which is dimensioned such that it covers at least the recessed central portion. The plate forms as a kind of cover together with the upper housing part of the electronics completely enclosing electronics housing.

For improved dissipation of the heat generated by the electronics, the plate has an at least partially axially in the direction of the electronics. has embossed contour, which is thermally coupled to the electronics. For this purpose, in addition to improving the heat conduction at the embossed contour of the plate or the spatially subsequent electronics mounted heat conducting pads are provided. Furthermore, it is favorable if the electronics are not completely sealed off from the environment and air circulation on the electronic components or along the circuit board is made possible. Therefore, it is provided in one embodiment that the plate has ventilation openings. The ventilation openings are preferably distributed in the circumferential direction provided on the outer edge of the plate.

In order to maximize the amount of heat dissipated by the electronics, a preferred size ratio of the diameter B of the plate to the diameter D of the circuit board is set to B / D> 1.5. The plate preferably extends in the radial direction beyond the recessed central portion.

To reduce the radio interference and improve the electromagnetic protection (EMC protection), the plate is preferably formed of metal. The fan housing is for example made of die-cast or plastic. In the case of the fan, it is further provided in a further development that a seal is arranged between the stator and the housing upper part, which sealingly seals the electronics with respect to a medium conveyed within the ventilator housing. The electronics thus has no contact with the pumped medium of the fan. It is also advantageous if the upper housing part is integrally formed and

Upper housing part and lower housing part can be fastened to one another via a tongue and groove connection. Also between the upper housing part and

Housing base is preferably in the region of the tongue and groove connection Seal provided.

With respect to the design is also advantageous if the maximum diameter D of the circuit board is greater than the maximum diameter d of the connection ring, so that sufficient space for the plurality of electronic component is made available. This is made possible by the arrangement of the electronics outside of the housing upper part and thus outside of the entire

Fan housing.

Other advantageous developments of the invention are characterized in the subclaims or are shown in more detail below together with the description of the preferred embodiment of the invention with reference to FIGS. Show it:

1 is a side sectional view of a fan according to the invention,

Fig. 2 is a side exploded view of the fan of Fig. 1; Fig. 3 is an exploded perspective view of the fan

Fig. 1;

Fig. 4 is a further exploded perspective view of the fan of Fig. 1;

Fig. 5 is an enlarged view of the connection ring. Like reference numerals designate like parts throughout the views.

1 shows an embodiment of a fan 1 according to the invention is shown in a side sectional view. Figures 2 to 4 show the same embodiment in exploded views from different angles. The following description applies to all figures.

The embodiment shown in Figures 1 - 4 shows a fan 1 with a fan housing 2 formed from a one-piece housing upper part 7 and a one-piece housing lower part 8 and a motor 3 received therein with a stator 4 and a rotor 5 which is connected to the fan wheel 6. The upper housing part 7 has an axial opening 9, at the axial inner side facing the lower housing part 8, the stator 4 and at its axial outer side at least one mounted on a circuit board 22 unit 20 of motor control electronics with adjacently arranged electronics for supplying one or more external consumers is arranged. The

Housing upper part 7 is built on both axial sides, on the one hand with the stator 4, on the other hand with the circuit board 22. The fan housing 2 is spiral-shaped and forms the pressure space around the inside of the fan housing

2 centrally located engine 3.

The motor 3 is an external rotor synchronous motor with a plastic-pressed stator 4, which is embraced by the rotor 5 on the outside. On the rotor 5, the fan wheel 6 is arranged and is driven by the motor 3. The motor 3 extends in the axial direction substantially over the entire axial length of the fan housing 2 in the direction of a suction region of the fan 1.

The commutation of the motor 3 via the motor control electronics on the circuit board 22. Additional external consumers are not shown.

The motor control electronics is contacted by the axial opening 9 of the upper housing part 7 without wires to the stator 4 via contact pins 30 and is detachably connected to the stator 4, so that the circuit board 22 is interchangeable.

On the stator 4, a connection ring 1 1 is provided, via which the stator 4 is axially and radially attached to the peripheral edge 10 of the axial opening 9 fitting. As illustrated in FIG. 5, the connecting ring 11 has a step 12 radially on the outside of the stator 4, so that the connecting ring 11 has an axial abutment surface 13 for axial abutment with the edge 10 of the stator

Housing upper part 7 and a Radialanlagefläche 14 for radial contact with the Edge 10 of the upper housing part 7 forms. Further, the connecting ring 1 1 comprises a bearing surface 15 parallel to the axial opening 9 and flush with the axially adjacent to the axial opening 9 portion of the upper housing part 7, on which the circuit board 22 is fastened by means of screws. Around its axial center, the upper housing part 7, the pot-like in the axial direction inwardly, ie in the direction of the lower housing part 8 depressed central portion 16. In the bottom region of the cup-like depression, the axial opening 9 is centrally provided. In the recessed central portion 16, the circuit board 22 is inserted with the unit 20 arranged thereon of a plurality of electronics, so that it is completely enclosed by the depressed central portion 16 in the axial and radial directions. The bottom and the walls of the recessed central portion 16 form part of the electronics housing for receiving the printed circuit board 22 with the unit 20 of the electronics. The electronics housing is closed with the metallic plate 17 which is fastened to the housing upper part 7 by means of screws and completely covers the countersunk central section 16 and consequently the electronics. Integrally formed on the plate 17 is an axially impressed contour 22 in the direction of the printed circuit board 22, which is thermally coupled to the unit 20 of the electronics in order to dissipate heat. The contour 18 has a substantially elliptical cross-section on the plate 17 and extends conically in the axial direction from two sides, so that its cross-sectional area in the direction of the printed circuit board 22 is reduced. Distributed in the circumferential direction at the peripheral edge of the plate 17 ventilation openings 19 are provided to allow air circulation along the unit 20 of the electronics and air exchange with ambient air. The ventilation openings 19 may alternatively be provided distributed on the plate 17.

The upper housing part 7 is fixed directly and sealed by a sealing ring on the lower housing part 8. Between the stator 4 and the

Housing top 7 is also a seal 21 arranged so that the unit 20 of the electronics with respect to the inside of the fan housing. 2 funded medium is separated.

The size ratio shown in the embodiment of the diameter B of the plate 17 relative to the diameter D of the printed circuit board 22 amounts to a value of 1, 9. The diameter D of the circuit board 22 is also greater by a factor of 1, 1 than the maximum diameter d of the connection ring 1 first

The invention is not limited in its execution to the above-mentioned preferred embodiments. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use. For example, a plurality of axially inwardly extending contours can be provided on the plate. Also, other forms of fan housing than the spiral shape shown are possible.

Claims

claims

A fan comprising a fan housing (2) and a motor (3) housed therein with a stator (4) and a rotor (5) connected to a fan wheel (6), said fan housing (2) comprising at least one housing top (7) and a lower housing part

(8) is formed, and the upper housing part (7) has an axial opening (9), at the housing lower part (8) facing axial inside of the stator (4) and at its axial outer side at least one electronics is arranged.

2. Fan according to claim 1, characterized in that the electronics is a motor control electronics or a unit (20) of motor control electronics with adjacently arranged electronics for supplying external consumers.

3. Fan according to claim 1 or 2, characterized in that the housing upper part (7) forms part of an electronics housing.

4. Fan according to one of claims 2 to 3, characterized in that the motor control electronics through the axial opening (9) of the

Housing upper part (7) directly without line contacted with the stator (4) and releasably connected to the stator (4).

5. Fan according to at least one of the preceding claims, characterized in that the stator (4) has a connection ring (1 1) via which the stator (4) axially and / or radially on a peripheral edge (10) of the axial opening (9 ) is attachable fitting.

6. Fan according to at least the previous claim, characterized marked, that the connecting ring (1 1) has at least one peripheral step (12) and thereby an axial abutment surface (13) and a Radialanlagefläche (14) on the edge (10) of the axial opening (9) and a support surface che (15) parallel to the radial extent of the axial opening (9), on which the electronics is directly attached.

7. Fan according to at least one of the preceding claims, characterized in that the housing upper part (7) has a cup-like in the axial direction inwardly recessed central portion (16), within which the axial opening (9) and the electronics is arranged.

8. Fan according to at least the preceding claim, characterized in that the electronics in the axial and radial direction is completely accommodated in the recessed central portion (16).

9. Fan according to the preceding claims 7 to 8, characterized in that on the upper housing part (7) a plate (17) is arranged, which covers at least the recessed central portion (16) and together with the upper housing part (7) at least the electronics enclosing electronics housing forms.

10. Fan according to the previous claim, characterized in that the plate (17) has an at least partially axially impressed in the direction of the electronics contour (18), which is thermally coupled to the electronics.

1 1 .Ventilator according to one of the preceding claims 9 to 1 1, characterized in that the plate (17) is formed of metal.

12. A fan according to at least one of the preceding claims, characterized in that between the stator (4) and the upper housing part (7), a seal (21) is arranged, which seals the electronics relative to a within the fan housing (2) conveyed medium.

13. Fan according to at least one of the preceding claims, characterized indicates that the upper housing part (7) is integrally formed.

14. Fan according to at least one of the preceding claims 9 to 14, characterized in that the electronics arranged on a printed circuit board (22) and a size ratio of a diameter B of the plate (17) against a diameter D of the printed circuit board (22) on B / D > 1, 5 is set.

15. Fan according to at least the preceding claim, characterized in that a size ratio of a diameter d of the connecting ring (1 1) relative to the diameter D of the printed circuit board (22) is set to D> d.