Patent Application
20170342859
This application claims the benefit of priority under 35 U.S.C. §119 of German Application DE 10 2016 109 994.5 filed May 31, 2016, the entire contents of which are incorporated herein by reference.
The present invention pertains to a side channel blower, which may be used, for example, to deliver the air necessary for the combustion with fuel in a vehicle heater in the direction of a combustion chamber.
Such a side channel blower is configured basically such that a ring-shaped air delivery duct, which is interrupted in a circumferential area by an interrupter area, is provided at a bottom wall of a blower housing. A flow medium inlet opening, via which the medium being delivered, i.e., for example, air, enters the air delivery duct, and a flow medium outlet opening, via which the medium being delivered leaves the delivery duct, are provided on both sides of the interrupter area. The delivery duct is covered by a delivery wheel, which is carried on a rotor shaft of a blower motor and can be driven by the blower motor for rotation. The delivery wheel has a ring-shaped delivery area, which is adapted to the ring-shaped form of the delivery duct and in which a plurality of delivery blades are provided following one another in the circumferential direction. In the delivery operation, i.e., during rotation of the delivery wheel, the delivery wheels sweep over the interrupter area, i.e., also the area in which the flow medium inlet opening is provided. The noises generated in the process can propagate over a duct, via which the flow medium flowing in the direction of the air delivery duct is being fed, and thus reach the outside area. To muffle these noises, its is generally necessary to arrange an external sound absorber at this duct guiding the flow medium to the flow medium inlet opening.
An object of the present invention is to provide a side channel blower, especially for a vehicle heater, in which the transportation of noises generated during the delivery operation to the outside is suppressed with a simple configuration.
This object is accomplished according to the present invention by a side channel blower, especially for a vehicle heater, comprising a blower housing with a bottom wall, wherein a ring-shaped delivery duct open towards an outer side of the blower housing is provided at the bottom wall, and with a circumferential wall, wherein the bottom wall and the circumferential wall enclose a housing interior, wherein a first flow chamber is provided in the housing interior, wherein a flow medium inlet for the entry of medium being delivered into the housing interior is open towards the first flow chamber, wherein a second flow chamber is provided in the housing interior, wherein a flow medium outlet for the discharge of medium being delivered from the housing interior to the air delivery duct is open towards the second flow chamber, wherein the first flow chamber is separated from the second flow chamber by means of at least one chamber separation element that is permeable to the medium being delivered.
By providing a plurality of flow chambers through which the medium being delivered flows, it is ensured in a side channel blower configured according to the present invention that noises generated in the area of the delivery duct are effectively muffled by reflection or absorption of sound in the area of the flow chambers through which the flow medium is to flow and thus these cannot essentially reach the outside via the flow medium inlet.
To intensify the effect of sound absorption by reflection or absorption even more in flow chambers through which flow is to take place serially, it is proposed that at least one third flow chamber be provided between the first flow chamber and the second flow chamber, wherein the first flow chamber is separated from a third flow chamber by a chamber separation element, and wherein the second flow chamber is separated from a third flow chamber by a chamber separation element.
A definition of the flow chambers radially inwardly in relation to a housing longitudinal axis can be achieved, for example, by a blower motor extending into the housing interior being carried at the bottom wall, wherein the first flow chamber or/and the second flow chamber, optionally also at least one third flow chamber, is defined by the circumferential wall and a motor housing of the blower motor.
To achieve an effective separation of the flow chambers from one another, it is proposed that at least one and preferably each chamber separation element extend between the circumferential wall and the motor housing. Provisions may be made in this connection, in particular, for at least one and preferably each chamber to adjoin the circumferential wall and the bottom wall and the motor housing and to preferably be in contact with it.
To make it possible to efficiently use the effect of the sound absorption, it is proposed that at least one chamber separation element and preferably each chamber separation element be made with flexible material, preferably foam material.
The possibility of flow through the flow chambers with simultaneous introduction of intensified sound absorption by reflection can be guaranteed by at least one chamber separation element and preferably each chamber separation element having at least one flow medium passage opening, wherein at least one flow medium passage opening preferably has an opening longitudinal axis not oriented at right angles to a housing longitudinal axis or to an axis that is parallel to the housing longitudinal axis.
According to another advantageous aspect, a flow medium duct opening into the first flow chamber at the flow medium inlet may be provided in a side channel blower according to the present invention, wherein the flow medium duct preferably has a duct longitudinal axis that is preferably essentially at right angles and not parallel to a housing longitudinal axis or to an axis extending parallel to the housing longitudinal axis in the area of the opening into the first flow chamber, and wherein the flow medium duct is, furthermore, preferably curved or kinked in an area located upstream of the opening into the first flow chamber. This also contributes to an intensified sound absorption by reflection.
The flow medium inlet is preferably provided at the circumferential wall. The flow medium outlet may be provided, for example, at the bottom wall. If the flow medium inlet and the flow medium outlet are arranged in this manner, an offset of said inlet and outlet in the direction of a housing longitudinal axis is provided, which contributes to the noise absorption based on the flow deflection imposed thereby.
To also close the housing interior on the axial side at a distance from the bottom wall and thus to provide a defined volume, via which the flow medium flows to the delivery duct, it is proposed that the housing interior be closed at an end area of the circumferential wall, facing away from the bottom wall, by an additional bottom wall, preferably provided at a connection/control device housing. This additional bottom wall may also be joined by at least one chamber separation element, preferably each chamber separation element, in order to separate the flow chambers in this area as well.
To couple a blower motor with a delivery wheel, which is to be driven by this for rotation and covers the delivery duct, it is proposed that a rotor shaft of the blower motor pass through an opening in the bottom wall, wherein the delivery wheel covering the air delivery duct is carried at the rotor shaft. Further, provisions may be made, for a constructively simple integration of the blower motor in the blower housing, for a motor housing of a blower motor to be fixed at the bottom wall or to be made integrally in one piece with the bottom wall.
The present invention further pertains to a vehicle heater with a combustion chamber assembly unit and with a side channel blower according to the present invention for delivering combustion air to a combustion chamber of the combustion chamber assembly unit.
The present invention will be described in detail below with reference to the attached figures. The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which preferred embodiments of the invention are illustrated.
In the drawings:
Referring to the drawings,
A ring-shaped delivery duct 22 open in the direction of the housing longitudinal axis L is provided at the bottom wall 14 on an outer side 20 facing away from the housing interior 18. The delivery duct 22 is interrupted in the circumferential direction by an interrupter area 24. A flow medium inlet opening 26 leading into the delivery duct 22 is formed in the circumferential direction on a side of the interrupter area 24. A flow medium outlet opening 28 leading out of the delivery duct 22 is provided at the other circumferential end area of the interrupter area 24.
A blower motor 30 is arranged in the housing interior 18. A motor housing 32 of the blower motor 30 may be made integrally in one piece with the bottom wall 14 or fixed thereon, e.g., by screw connection. A stator comprising stator windings as well as a rotor interacting with the stator by magnetic force are provided in the interior of the motor housing 32. A rotor shaft 34 of the blower motor 30 passes through an opening 36 in the bottom wall 14 and thus projects over the outer side 20 of the bottom wall 14. A delivery wheel W, may be coupled with the rotor shaft 34 nonrotatingly in this area of the rotor shaft 34, so that this delivery wheel W rotates, for example, about the housing longitudinal axis L during the rotation operation of the blower motor 30. The delivery wheel W has, in general, a ring-shaped delivery area covering the delivery duct 22 with a plurality of delivery wheels following one another in the circumferential direction about the housing longitudinal axis L.
If the motor housing 32 is configured as an integral part of the bottom wall 14 and hence of blower housing 12, the blower housing 12 may be manufactured in a simple manner as a plastic injection molded part. In a circumferential area, the motor housing 32 may have now a separation area 38, which projects radially outwardly in relation to the housing longitudinal axis L and its otherwise essentially regular cylindrical circumferential contour and extend up to the circumferential wall 16, and adjoin the latter wall by connection in substance in case of integral configuration. A first flow chamber 40 provided in the housing interior 18 and a second flow chamber 42 likewise provided in the housing interior 18 are separated from one another preferably completely by the separation area 38.
A flow medium duct 44 provided for feeding the medium to be delivered, for example, air, is provided in a tubular extension 46, which is formed, for example, likewise integrally with the blower housing 12. In the area in which it has its opening 48 into the first flow chamber 40, the flow medium duct 44 extends with its duct longitudinal axis K essentially at right angles to the housing longitudinal axis L or to an axis which is parallel thereto and opens via a flow medium inlet 50, for example, at least one inlet opening, into the first flow chamber 40. The flow medium duct 44 is kinked essentially at right angles upstream of the opening 48 and extends in the direction away from the opening 48, for example, essentially parallel to the housing longitudinal axis L.
The second flow chamber 42 or the flow medium inlet opening 26 essentially providing the flow medium outlet 52 is open towards the ring-shaped duct 22 in the area of said flow medium outlet 52, which is formed in the bottom wall 14 and is axially offset in relation to the flow medium inlet 50 in the direction of the housing longitudinal axis. The second flow chamber 42 is defined in an axial direction by the bottom wall 14 and is defined in an opposite axial direction by an additional bottom wall 54, which is provided at a connection/control device housing 56 connected to the blower housing 12 in the area of the circumferential wall 16 of said blower housing. A plug connection area 58 may be provided at the connection/control device housing 56 in order to make it possible to couple the blower motor 30 to a vehicle electrical system for energy supply. Further, a control device associated with the side channel blower 10 or the blower motor 30 may be provided in the connection/control device housing 56 in order to make it possible to actuate the blower motor 30 in a suitable manner for carrying out the delivery operation. The second flow chamber 42 is defined in the circumferential direction by the circumferential wall 16, the motor housing 32, especially the separation area 38 thereof, and a chamber separation element 60 yet to be explained in detail below.
The first flow chamber 40 is also defined in the two axial directions in relation to the housing longitudinal axis L by the bottom wall 14, on the one hand, and the additional bottom wall 54 of the connection/control device housing 56, on the other hand. The first flow chamber 40 is defined in the circumferential direction by the circumferential wall 16, the motor housing 32, especially the separation area 38 thereof, and an additional chamber separation element 62.
The two chamber separation elements 60, 62 are arranged at spaced locations from one another, for example, at an angular distance of about 90°, in the circumferential direction in relation to the housing longitudinal axis L. A third flow chamber 64 is formed between the two chamber separation elements 60, 62. The third flow chamber 64 is thus defined in both axial directions between the bottom walls 14, 54 in relation to the housing longitudinal axis L and by the two chamber separation elements 60, 62, the circumferential wall 16 of the blower housing 12 and the motor housing the circumferential direction.
To make possible the passage of the flow medium, the chamber separation element 60 has a plurality of flow medium passage openings 74, which extend in the chamber separation element 60 between the two circumferential sides 76, 78 facing the second flow chamber 42 and the third flow chamber 64, for example, essentially a straight line along a respective opening longitudinal axis O. For example, the flow medium passage openings 74 extend essentially parallel to one another not at right angles in relation to the housing longitudinal axis L or an axis parallel thereto and also not parallel, i.e., at an angle different from 90° or 180°.
The medium being delivered through the side channel blower 10 is drawn in during the rotation operation of the delivery wheel W via the flow medium duct 44 and thus it reaches the first flow chamber 40 via the flow medium inlet 50. The medium to be delivered flows from the first flow chamber 40 through the chamber separation element 62 and the flow medium passage openings 74 formed therein into the third flow chamber 64. The medium to be delivered enters the second flow chamber 42 from the third flow chamber 64 through the flow medium passage openings 74 of the chamber separation element 60. The medium to be delivered flows via the flow medium outlet 52 or the flow medium inlet opening 26 into the delivery duct 22 close to the interrupter area 24.
The medium to be delivered is thus deflected multiple times in its flow direction over its flow path from the flow medium duct 44 to the ring-shaped duct 22. Such a flow deflection takes place already before the entry into the first flow channel 40, it takes place at the time of entry into the flow medium passage openings 74 of the chamber separation element 62 and also at the time of discharge from these; it takes place, furthermore, at the time of entry into the flow medium passage openings 74 of the chamber separation element 60 and at the time of discharge from these, and it takes place finally at the time of discharge from the second flow chamber 42 into the delivery duct 22. Based on this multiple deflection of the flow of the medium being delivered over its flow path to the ring-shaped duct 22, direct exit of the sound generated in the area of the interrupter area 24 over the flow path of the medium being delivered is not possible. Based on the multiple reflections to the walls defining different flow chambers, which occur in the flow path, and also based on the absorption especially on the chamber separation elements 60, 62, efficient noise muffling is achieved, so that propagation of the noises generated especially in the area of the interrupter area 24 during the rotation operation of the delivery wheel W over the flow path of the medium being delivered to the ring-shaped duct 22 is extensively prevented.
It should be noted that this muffling of noises generated during the variation of the side channel blower 10, which is achieved according to the present invention, can also be achieved in a variant of the side channel blower 10 shown in the figures, while the principles of the present invention are maintained. For example, it may be possible not to provide the third flow chamber, so that only the first flow chamber 40 and the second flow chamber 42 and a chamber separation element directly separating these two from one another as well as also the separation area 38 are provided. It would also be possible to provide a plurality of third flow chambers 64 following each other in series between the first flow chamber 40 and the second flow chamber 42. The chamber separation elements 60, 62 could be inserted into the blower housing 12 to intensify the deflection effect such that the respective flow medium passage openings 74 being provided therein are bent opposite in relation to the housing longitudinal axis L. While the configuration of the chamber separation elements 60, 62 as separate components and thus making them from a material that may differ from the material of the blower housing 12 for an intensified absorption and muffling effect are especially advantageous, it would also be possible, in principle, to make the chamber separation elements integrally in one piece with the lower housing by connection in substance in contact with the circumferential wall 16 and the motor housing 32 as well as the bottom wall 14. To intensify the sound absorption effect even more, the inner surface of the blower housing could be structured, for example, roughened, or layers made of sound-absorbing material, for example, foam material, could be provided on the inner surface of the blower housing.
While specific embodiments of the invention have been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2016 109 994.5 | May 2016 | DE | national |
