EP3252315B1 - Side channel blower, in particular for a vehicle heating device - Google Patents

Description

The present invention relates to a side channel blower according to the preamble of claim 1, which can be used, for example, to promote in a vehicle heater the air required for combustion with fuel toward a combustion chamber.

Such from the DE 40 29 041 A1 Known side channel blower is basically constructed such that a ring-like air delivery channel is provided on a bottom wall of a blower housing, which is interrupted in a peripheral region of a breaker area.
On both sides of the interrupter region are a conveying medium inlet opening, via which the medium to be conveyed, for example air, enters the air conveying channel, and a conveying medium outlet opening is provided, via which the medium to be conveyed leaves the conveying channel. The delivery channel is covered by a driven on a rotor shaft of a blower motor and driven by the fan motor for rotation conveyor wheel. The delivery wheel has a ring-shaped delivery region adapted to the annular shape of the delivery channel, in which a plurality of delivery blades are provided sequentially in the circumferential direction. In the conveying mode, ie during rotation of the feed wheel, the feed vanes cover the breaker area, thus also the area in which the feed medium inlet opening is provided. The resulting noise can propagate through a channel, via which the medium flowing in the direction of the air delivery channel is supplied, and thus reach the outside. To dampen these noises, it is generally necessary to attach an external silencer to this channel, which carries the fluid to the fluid inlet port. In this known side channel blower, the first flow chamber and the second flow chamber are separated by a surrounding a motor housing of the blower motor surrounding arranged air-flow filter.

The DE 43 41 266 C1 discloses a side channel compressor in which the air to be delivered is introduced via a nozzle provided on a housing. Attachments such as silencers, filters or safety valves can be connected to these nozzles.

It is the object of the present invention to provide a side channel blower, in particular for a vehicle heater, in which, in a structurally simple embodiment, the transport of noise generated in the conveying operation is suppressed to the outside.

According to the invention this object is achieved by a side channel blower, in particular for a vehicle heater, according to claim 1. This comprises a fan housing with a bottom wall, wherein on the bottom wall an open to an outside of the blower housing, ring-like conveying channel is provided, and having a peripheral wall, wherein the Bottom wall and the peripheral wall enclose a housing interior, wherein in the housing interior, a first flow chamber is provided, with a Fördermediumeintritt is open to the medium to be pumped into the housing interior to the first flow chamber, wherein in the housing interior, a second flow chamber is provided, wherein a Fördermediumaustritt for Outlet of medium to be conveyed from the housing interior to the air conveying channel to the second flow chamber is open, wherein the first flow chamber by means of at least one for medium to be conveyed permeable Kammentrennelem ents is separated from the second flow chamber.

In the case of a side-channel blower constructed according to the invention, provision of a plurality of flow chambers to be flowed through by the medium to be conveyed ensures that noises arising in the area of the conveying channel are effectively damped by reflection or absorption of sound in the flow chambers to be flowed through by the conveying medium and thus in the Essentially, they can not escape to the outside via the fluid inlet.

In order to further enhance the effect of sound absorption by reflection or absorption in flow chambers to be flowed through in series, it is proposed that at least a third flow chamber is provided between the first flow chamber and the second flow chamber, the first flow chamber being separated from a third by a chamber separation element Flow chamber is separated, and wherein the second flow chamber is separated by a chamber separating element of a third flow chamber.

A limitation of the flow chambers radially inward relative to a housing longitudinal axis is achieved in that on the bottom wall extending into the housing interior fan motor is supported, wherein the first flow chamber and the second flow chamber, possibly also at least a third flow chamber through the peripheral wall and a Motor housing of the fan motor is limited.

In order to achieve an effective separation of the flow chambers from each other, extends at least one, preferably each chamber separation element between the peripheral wall and the motor housing. In particular, it can be provided that at least one, preferably each chamber separation element adjoins the peripheral wall and the bottom wall and the motor housing, preferably it rests.

In order to be able to use the effect of the sound absorption by absorption efficiently, it is proposed that at least one chamber separation element, preferably each chamber separation element, is constructed with flexible material, preferably foam material.

A flowability of the flow chambers with simultaneous introduction of an increased sound attenuation by reflection can be ensured that at least one chamber separation element, preferably each chamber separation element, at least one conveying medium passage opening, preferably at least one conveying medium passage opening to one Has housing longitudinal axis or an axis parallel to the housing longitudinal axis not orthogonally oriented opening longitudinal axis.

According to a further advantageous aspect, in a side channel blower according to the invention, a delivery medium channel opening into the first flow chamber at the delivery medium inlet may be provided, wherein preferably the delivery medium channel in the region of the confluence into the first flow chamber does not parallel, preferably substantially parallel, to a housing longitudinal axis or to an axis parallel to the housing longitudinal axis orthogonal channel longitudinal axis, wherein more preferably the conveying medium channel in an area upstream of the junction curved into the first flow chamber or is bent. This also contributes to increased sound attenuation by reflection.

The delivery medium inlet is preferably provided on the peripheral wall. The delivery medium outlet can be provided, for example, on the bottom wall. If the delivery medium inlet and the delivery medium outlet are arranged in this manner, then an offset thereof is provided in the direction of a housing longitudinal axis, which contributes to noise damping due to the flow deflection forced thereby.

In order to complete the interior of the housing at the axial side remote from the bottom wall and thus provide a defined volume over which the fluid flows to the conveyor channel, it is proposed that the interior of the housing be provided at an end region of the circumferential wall facing away from the bottom wall by a further bottom wall on a port / controller enclosure. At least one chamber separating element, preferably each chamber separating element, can also be connected to this further bottom wall, in order to separate the flow chambers from one another in this region as well.

For coupling a fan motor with a driven by this for rotation and the conveyor channel covering conveyor wheel is proposed that a rotor shaft of the fan motor passes through an opening in the bottom wall, wherein on the rotor shaft, the air conveyor channel covering the conveyor wheel is supported. Furthermore, it may be provided for a structurally simple integration of the fan motor in the fan housing that a motor housing of a fan motor is fixed to the bottom wall or formed integrally with the bottom wall.

The invention further relates to a vehicle heater having a combustion chamber assembly and a side channel blower according to the invention for conveying combustion air to a combustion chamber of the combustion chamber assembly.

Fig. 1

ein Seitenkanalgebläse bei entferntem Förderrad und teilweise im Schnitt dargestelltem Gebläsegehäuse in perspektivischer Ansicht;

Fig. 2

eine der Figur 1 entsprechende Ansicht, betrachtet von einer anderen Seite;

Fig. 3

ein Gebläsegehäuse des Seitenkanalgebläses der Fig. 1 in perspektivischer Ansicht;

Fig. 4

ein Kammertrennelement des Seitenkanalgebläses der Fig. 1 in perspektivischer Ansicht;

Fig. 5

das Kammertrennelement der Fig. 4, geschnitten längs einer Linie V-V in Fig. 4.

The present invention will be described below in detail with reference to the accompanying drawings. It shows:

Fig. 1

a side channel blower with the conveyor wheel removed and fan housing partly shown in section in a perspective view;

Fig. 2

one of the FIG. 1 corresponding view, viewed from another side;

Fig. 3

a blower housing of the side channel blower of Fig. 1 in perspective view;

Fig. 4

a chamber separating element of the side channel blower of Fig. 1 in perspective view;

Fig. 5

the chamber separating element of Fig. 4 , cut along a line VV in Fig. 4 ,

The Fig. 1-3 The blower housing 12 is basically elongated in the direction of a housing longitudinal axis L and has a bottom wall 14 oriented substantially orthogonal to the housing longitudinal axis L and a peripheral wall 14 adjacent to the outer peripheral area and in the direction of the housing longitudinal axis L extending peripheral wall 16. The bottom wall 14 and the peripheral wall 16 formed with a substantially rectangular contour define a housing interior 18 of the blower housing 12.

On the bottom wall 14, a ring-like conveying channel 22 which is open in the direction of the housing longitudinal axis L is provided on an outer side 20 facing away from the housing interior 18. By a breaker area 24 of the delivery channel 22 is interrupted in the circumferential direction. In the circumferential direction on one side of the breaker area 24 is one in the delivery channel 22 leading Delivery medium inlet opening 26 is formed. At the other circumferential end region of the interrupting region 24, a conveying medium outlet opening 28 leading from the conveying channel 22 is provided.

In the housing interior 18, a blower motor 30 is arranged. A motor housing 32 of the blower motor 30 may be integrally formed with or attached to the bottom wall 14, e.g. be determined by screwing. Inside the motor housing 32, a stator windings comprehensive stator and provided in magnetic force interaction with the stator rotor are provided. A rotor shaft 34 of the blower motor 30 passes through an opening 36 in the bottom wall 14 and thus protrudes beyond the outside 20 of the bottom wall 14. In this region of the rotor shaft 34, a not shown in the figures conveyor wheel with the rotor shaft 34 are rotatably coupled, so that it rotates in the rotary operation of the fan motor 30, for example, to the housing longitudinal axis L. The conveyor wheel generally has a conveyor belt 22 covering the annular conveying area with a plurality of circumferentially around the housing longitudinal axis L successive conveyor blades.

In embodiment of the motor housing 32 as an integral part of the bottom wall 14 and thus of the blower housing 12, the blower housing 12 can be prepared in a simple manner as a plastic injection molded part. In this case, in a peripheral region, the motor housing 32 extend with respect to the housing longitudinal axis L and its otherwise substantially circular cylindrical circumferential contour radially outwardly projecting separation area 38 zoom up to the peripheral wall 16, connect with an integral design of these materially. By the separation region 38 provided in the housing interior 18 first flow chamber 40 and also provided in the housing interior 18 second flow chamber 42 are preferably completely separated from each other.

A delivery medium channel 44 provided for supplying the medium to be conveyed, for example air, is provided in a tubular extension 46, which is also formed integrally with the blower housing 12, for example. In the area its mouth 48 in the first flow chamber 40, the delivery medium channel 44 extends with its channel longitudinal axis K substantially orthogonal to the housing longitudinal axis L or a parallel axis and flows through a fluid inlet 50, for example, at least one inlet opening into the first flow chamber 40 a. Upstream of the junction 48 of the conveying medium channel 44 is bent substantially at right angles and extends in the direction of the junction 48 away, for example, substantially parallel to the housing longitudinal axis L.

The second flow chamber 42 is in the region of a formed in the bottom wall 14, with respect to the conveying medium inlet 50 axially offset in the direction of the housing longitudinal conveying medium outlet 52 and the Fördermediumaustritt 52 substantially providing the conveying medium inlet opening 26 to the annular channel 22 open. The second flow chamber 42 is bounded in an axial direction by the bottom wall 14 and is bounded in an opposite axial direction by a further bottom wall 54 which is provided on a connected to the fan housing 12 in the peripheral wall 16 of the same connection / controller housing 56 , A plug connection region 58 can be provided on the connection / control device housing 56 in order to be able to couple the blower motor 30 with an on-board voltage system for the purpose of energy supply. Furthermore, a control device assigned to the side channel blower 10 or the blower motor 30 may be provided in the connection / control device housing 56 in order to be able to suitably control the blower motor 30 for carrying out the conveying operation. In the circumferential direction, the second flow chamber 42 by the peripheral wall 16, the motor housing 32, in particular the separation region 38 thereof, and a below explained in more detail Kammertrennelement 60 is limited.

The first flow chamber 40 is limited in the two axial directions with respect to the housing longitudinal axis L by the bottom wall 14 on the one hand and the other bottom wall 54 of the terminal / controller housing 56 on the other. In the circumferential direction, the first flow chamber 40 through the peripheral wall 16, the motor housing 32, in particular the separation region 38 thereof, and another chamber separating element 62 limited.

The two chamber separating elements 60, 62 are arranged in the circumferential direction with respect to the housing longitudinal axis L at a distance from each other, for example with an angular distance of about 90 °. Between the two chamber separation elements 60, 62, a third flow chamber 64 is formed. The third flow chamber 64 is thus limited in both axial directions with respect to the housing longitudinal axis L between the bottom walls 14, 54 and in the circumferential direction by the two chamber separating elements 60, 62, the peripheral wall 16 of the fan housing 12 and the motor housing 32.

The 4 and 5 By way of example, the chamber separating element 60 shows the structure of both chamber separating elements 60, 62. The chamber separating element 60 is of essentially parallelepiped-like construction and made, for example, of flexible, sound-absorbing material, for example foam material. Due to its flexibility, the chamber separation element 60 between the peripheral wall 16 and the motor housing 32 and the two bottom walls 14, 54 respectively disposed under pressure, so that it bears against the respective walls under pressure and thus is kept stable on the one hand, on the other hand in this Connection area to the various walls prevents the flow of medium to be pumped. In order to achieve in each case an areal investment in these areas, the chamber separation element 60 in its adaptation to the contour of the two bottom walls 14, 54 is substantially flat at its two end faces 66, 68 formed. Also provided for abutment with the peripheral wall 16 peripheral side 70 is formed substantially flat according to the substantially planar shape of the peripheral wall 16 in this investment area. The peripheral side 72 provided for abutment with the motor housing 32 is designed in adaptation to the substantially circular peripheral contour of the motor housing 32 with a substantially circular concave shape.

In order to allow the passage of the pumped medium, the chamber separation element 60 has a plurality of conveying medium through openings 74, which in the chamber separation element 60 between the two of the second flow chamber 42 and the third flow chamber 64 facing peripheral sides 76, 78, for example, substantially straight along a respective opening longitudinal axis O extend. For example, the conveying medium through openings 74 extend substantially parallel to one another and with respect to the housing longitudinal axis L or an axis parallel thereto, not orthogonal and not parallel, ie at an angle other than 90 ° or 180 °.

The conveyed through the side channel blower 10 medium is sucked in the rotary operation of the feed wheel via the conveying medium channel 44 and thus passes through the medium inlet 50 into the first flow chamber 40. From the first flow chamber 40, the medium to be conveyed flows through the chamber separation element 62 and the formed therein Fördermediumdurchtrittsöffnungen From the third flow chamber 64, the medium to be conveyed passes through the conveying medium passage openings 74 of the chamber separating element 60 into the second flow chamber 42. Via the conveying medium outlet 52 or the conveying medium inlet opening 26, the medium to be conveyed flows near the interrupting region 24 in the delivery channel 22nd

On the flow path from the conveying medium channel 44 to the annular channel 22 thus the medium to be conveyed is deflected several times in its flow direction. Such a flow deflection takes place prior to entry into the first flow chamber 40, takes place upon entry into the conveying medium through openings 74 of the chamber separating element 62 or at the exit from these, continues to occur when entering the conveying medium through openings 74 of the chamber separation element 60 and at the exit of these and Finally, at the exit from the second flow chamber 42 in the conveying channel 22. Due to this multiple deflection of the flow of the medium to be conveyed on the flow path to the annular channel 22 is a direct exit of the in the region of the breaker area 24th generated sound over the flow path of the medium to be delivered not possible. Due to the multiple reflection occurring in the flow path to the various flow chambers limiting walls and also due to the absorption, in particular at the chamber separation elements 60, 62 an efficient noise attenuation is achieved so that a propagation of the rotating operation of the feed wheel in particular in the area of the breaker area 24 resulting noise on the Flow path of the medium to be conveyed to the annular channel 22 is largely prevented out.

It should be pointed out that this damping achieved according to the invention by noise generated during the conveying operation of the side channel blower 10 can also be achieved with a modification of the side channel blower 10 shown in the figures, while maintaining the principles of the present invention. For example, it may be possible to dispense with the provision of the third flow chamber, so that only the first flow chamber 40 and the second flow chamber 42 or a chamber separation element which separates them directly from one another and also the separation region 38 are provided. Also, in series, a plurality of third flow chambers 64 could be provided between the first flow chamber 40 and the second flow chamber 42. The chamber separating elements 60, 62 could be used to reinforce the deflection effect in the fan housing 12, that the therein respectively provided conveying medium passage openings 74 are angled opposite to the housing longitudinal axis L. While the design of the chamber separating elements 60,62 as separate components and thus of a material which may differ from the material of the blower housing 12 to the increased absorption damping effect is particularly advantageous, could basically the chamber separation elements with the blower housing 12 to the peripheral wall 16 and The motor housing 32 as well as the bottom wall 14 material integrally then be integrally formed. To further enhance the sound attenuation effect, the inner surface of the fan housing could be structured, for example, roughened, formed, or it could be on the inner surface of the fan housing pads sound-absorbing material, such as foam material may be provided.

Claims (11)

1. Side channel blower, especially for a vehicle heater, comprising a blower housing (12) with a bottom wall (14), wherein a ring-shaped delivery duct (22) open towards an outer side (20) of the blower housing (12) is provided at the bottom wall (14), and with a circumferential wall (16), wherein the bottom wall (14) and the circumferential wall (16) enclose a housing interior (18), wherein a first flow chamber (40) is provided in the housing interior (18), wherein a flow medium inlet (50) is open for the entry of medium being delivered into the housing interior (18) to the first flow chamber (40), wherein a second flow chamber (42) is provided in the housing interior (18), wherein a flow medium outlet (52) is open for the discharge of medium being delivered from the housing interior (18) to the air delivery duct (22) to the second flow channel (42), and wherein the first flow channel (40) is separated from the second flow channel (42) by means of at least one chamber separation element (60, 62) permeable to medium being delivered, wherein a blower motor (30) extending into the housing interior (18) is carried at the bottom wall (14), characterized in that the first flow chamber (40) and the second flow chamber (42) are defined by the circumferential wall (16) and a motor housing (32) of the blower motor (30), and in that at least one chamber separation element (60, 62) extends between the circumferential wall (16) and the motor housing (32).
2. Side channel blower in accordance with claim 1, characterized in that at least one third flow chamber (64) is provided between the first flow chamber (40) and the second flow chamber (42), wherein the first flow chamber (40) is separated by a chamber separation element (62) from a third flow chamber (64), and wherein the second flow chamber (42) is separated by a chamber separation element (60) from a third flow chamber (64).
3. Side channel blower in accordance with claim 1 or 2, characterized in that each chamber separation element (60, 62) extends between the circumferential wall (16) and the motor housing (32).
4. Side channel blower in accordance with one of the above claims, characterized in that at least one chamber separation element (60, 62) and preferably each chamber separation element (60, 62) adjoins the circumferential wall (16) and the bottom wall (14) and preferably is in contact with them.
5. Side channel blower in accordance with one of the above claims, characterized in that at least one chamber separation element (60, 62) and preferably each chamber separation element (60, 62) is made from a flexible material, preferably foam material.
6. Side channel blower in accordance with one of the above claims, characterized in that at least one chamber separation element (60, 62) and preferably each chamber separation element (60, 62) has at least one flow medium passage opening (74), wherein preferably at least one flow medium passage opening (74) has an opening longitudinal axis (O) not oriented at right angles to a housing longitudinal axis (L) or to an axis that is parallel to the housing longitudinal axis (L).
7. Side channel blower in accordance with one of the above claims, characterized in that a flow medium duct (44) opening into the first flow chamber (40) leads to the flow medium inlet (50), wherein the flow medium duct (44) preferably has a duct longitudinal axis (K), which preferably extends essentially at right angles and is not parallel to a housing longitudinal axis (L) or to an axis that is parallel to the housing longitudinal axis, wherein the flow medium duct (44) is further preferably curved or kinked in an area located upstream of the opening (58) into the first flow chamber (40).
8. Side channel blower in accordance with one of the above claims, characterized in that the flow medium inlet (50) is provided at the circumferential wall (16), or/and that the flow medium outlet (52) is provided at the bottom wall (14).
9. Side channel blower in accordance with one of the above claims, characterized in that the housing interior (18) is closed by an additional bottom wall (54), preferably provided at a connection/control device housing (56), at an end area of the circumferential wall (16) facing away from the bottom wall (14), wherein preferably a chamber separation element (60, 62), preferably each chamber separation element (60, 62) adjoins the additional circumferential wall (54).
10. Side channel blower in accordance with one of the above claims, characterized in that a rotor shaft (34) of a blower motor (30) passes through an opening (36) in the bottom wall (14), wherein a delivery wheel covering the air delivery duct (22) is carried on the rotor shaft (34), or/and that a motor housing (32) of a blower motor (30) is secured on the bottom wall (14) or is made integrally with the bottom wall (14).
11. Vehicle heater with a combustion chamber assembly unit and with a side channel blower (10) in accordance with one of the above claims for delivering combustion air to a combustion chamber of the combustion chamber assembly unit.

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