RESONATOR

Abstract

A resonator (1, 1′, 1″) for reducing airborne noise has at least one first ring-shaped chamber (2, 2′, 2″) arranged between an inlet piece (6, 6′) and an outlet piece (7, 7′). An inner tube (3) or inner tube pieces (4, 4″, 5) are arranged between the inlet piece (6, 6′) and outlet piece (7, 7′) and have wall apertures (18, 19, 28, 28″, 29, 29″, 30, 30″) as a connection to the adjacent ring-shaped chamber (2, 2′, 2″). The first ring-shaped chamber (2, 2′, 2″) is divided by at least one radially encircling dividing rib (13, 13′, 13″) into at least two sub-chambers (14, 14′, 14″, 15, 15′, 15″). The dividing rib (13, 13′, 13″) has a free end that, relative to the wall that is adjacent in a radial direction, forms an encircling annular space (16) for receiving an air layer that co-resonates in steady-state.

Claims

1. A resonator (1, 1′, 1″) for reducing airborne noise, having at least one first ring-shaped chamber (2, 2′, 2″) arranged between an inlet piece (6, 6′) and an outlet piece (7, 7′), and having an inner tube (3) or inner tube pieces (4, 4″, 5) arranged between the inlet piece (6, 6′) and outlet piece (7, 7′), with wall apertures (18, 19, 28, 28″, 29, 29″, 30, 30″) serving as a connection to the adjacent ring-shaped chamber (2, 2′, 2″), the first ring-shaped chamber (2, 2′, 2″) being divided by at least one radially encircling dividing rib (13, 13′, 13″) into at least two sub-chambers (14, 14′, 14″, 15, 15′, 15″), the dividing rib (13, 13′, 13″) having a free end which, relative to the wall that is adjacent in a radial direction, forms an encircling annular space (16) for receiving an air layer that co-resonates in steady-state fashion in the radial direction, the height (24) of the annular space between the free end of the dividing rib (13, 13′, 13″) and the adjacent wall is between 0.3 and 2 mm, the dividing rib (13, 13′, 13″) being a circumferential double rib that delimits a circumferential gap (17), the gap (17) being open in a direction of the circumferential annular space (16), the inner tube (3) or inner tube piece (4, 4″) that delimits the sub-chambers (14, 14′, 14″, 15, 15′, 15″) having wall apertures (18, 19, 28, 28″, 29, 29″, 30, 30″) forming a connection to the adjacent sub-chamber (14, 14′, 14′″, 15, 15′, 15″).

2-3. (canceled)

4. The resonator of claim 1, wherein at least one of the sub-chambers (14, 14″, 15, 15′) has at least one circumferential control fin (20, 21, 22, 22′, 22″, 23, 23′, 23″).

5. The resonator of claim 4, wherein in the radial direction, the control fin (20, 21, 22, 22′, 22″, 23, 23′, 23″) is of the same height as or lower than the dividing rib (13, 13′, 13″).

6. The resonator of claim 1, wherein, in the radial direction, the height (24) of the annular space between the free end of the dividing rib (13, 13′, 13″) and the adjacent wall is between 0.3 and 2 mm.

7. The resonator of claim 6, wherein the height (24) of the annular space is between 0.5 and 1.5 mm.

8. The resonator of claim 7, wherein the height (24) of the annular space is 1 mm.

9. The resonator of claim 1, wherein the dividing rib (13, 13′, 13″) is arranged on the inner tube (3) or the inner tube piece (4, 4″), and the wall adjacent to the free end of the dividing rib (13, 13′, 13″) is formed by the outer wall (10, 10′, 10″) of the first ring-shaped chamber (2, 2′, 2″), said outer wall facing away from the inner tube (3) or inner tube piece (4, 4″).

10. The resonator of claim 1, wherein the inlet piece (6, 6′) is attached to a first jacket-sheath (9, 9′), the cylindrical wall of which forms the outer wall (10, 10′, 10″) of the first ring-shaped chamber (2, 2′, 2″) and the ring-shaped lateral wall of which (11, 11′), that serves as a connection to the inlet piece (6, 6′), simultaneously forms the lateral delimitation of the first ring-shaped chamber (2, 2′, 2″) in the direction of the inlet piece (6, 6′).

11. The resonator of claim 10, wherein the outlet piece (7) is formed by an extension of the inner tube (3), and, in the direction of the inlet piece (6), the outlet piece (7) has a ring-shaped lateral wall (12) that forms the lateral delimitation of the first ring-shaped chamber (2) in the direction of the outlet piece (7).

12. The resonator according to of claim 10, wherein at its end facing away from the inlet piece (6′), the first inner tube piece (4, 4″) has a ring-shaped lateral wall (12′, 12″) that forms the lateral delimitation of the first ring-shaped chamber (2′, 2″) towards the outlet piece (7′) and by means of which the inner tube piece (4, 4″) is attached to the first jacket-sheath (9′).

13. The resonator of claim 12, wherein the outlet piece (7′) transitions into the second inner tube piece (5), and the outlet piece (7′) penetrates the base (25) of a pot-shaped second jacket-sheath (26), the cylindrical wall of which is connected, at its end facing toward the first jacket-sheath (9′), to the ring-shaped lateral wall (12′, 12″), which also forms a first lateral wall for a second ring-shaped chamber (27), the second lateral wall of which is formed by the base (25) of the second jacket-sheath (26).

Description

BRIEF DESCRIPTION OF DRAWINGS

[0018] FIG. 1 a lateral cross-sectional view of a resonator with a ring-shaped chamber divided into two sub-chambers.

[0019] FIG. 2 an enlarged depiction of detail II of FIG. 1.

[0020] FIG. 3 a lateral cross-sectional view of another resonator with a first ring-shaped chamber divided into two sub-chambers, and a second ring-shaped chamber.

[0021] FIG. 4 A lateral view of the resonator from FIG. 3 as viewed from Direction IV.

[0022] FIG. 5 a lateral cross-sectional view of another resonator with a first ring-shaped chamber divided into two sub-chambers, and a second ring-shaped chamber.

DETAILED DESCRIPTION

[0023] A resonator 1 to reduce airborne noise essentially consists of a first ring-shaped chamber 2, an inner tube 3 or inner tube pieces 4, 5.

[0024] The first ring-shaped chamber 2 is arranged between an inlet piece 6 and an outlet piece 7. As seen in FIG. 1, the first ring-shaped chamber 2 is delimited inwardly towards the longitudinal axis 8 by the inner tube 3. The inlet piece 6 is attached to a pot-like first jacket-sheath 9, the cylindrical wall of which forms the outer wall 10 of the first ring-shaped chamber 2, and the ring-shaped lateral wall 11 of which, serving as a connection to the inlet piece 6, simultaneously forms the lateral delimitation of the first ring-shaped chamber 2 in the direction of the inlet piece 6.

[0025] In the exemplary embodiment seen in FIG. 1, the outlet piece 7 is formed by an extension of the inner tube 3. The outlet piece 7, in the direction of the inlet piece 6, has a ring-shaped lateral wall 12 that forms the lateral delimitation of the first ring-shaped chamber 2 in the direction of the outlet piece 7.

[0026] In the exemplary embodiment seen in FIG. 1, the first ring-shaped chamber 2 is subdivided, by a dividing rib 13, which radially encircles the inner tube 3, into a first sub-chamber 14 and a second sub-chamber 15. In the radial direction toward the adjacent wall, which in the exemplary embodiment is the outer wall 10 of the first ring-shaped chamber 2, the dividing rib 13 has a circumferential annular space 16 to accommodate a layer of air co-resonating in steady-state fashion (not shown).

[0027] The dividing rib 13 is designed as a circumferential double rib that delimits a circumferential gap 17. The gap 17 is open in the radial direction toward the annular space 16. The inner tube 3 that delimits the sub-chambers 14, 15 has wall apertures 18 forming a connection to the first sub-chamber 14 and wall apertures 19 forming a connection to the second sub-chamber 15. In the exemplary embodiment shown in FIG. 1, the first sub-chamber 14 has two circumferential control fins, 20, 21. Similarly, the second sub-chamber 15 has two control fins 22, 23. The wall apertures 18 are arranged between the control fins 20, 21, and the wall apertures 19 are arranged between the control fins 22, 23. As shown in FIGS. 1 and 2, the annular space 16 has a height 24 of 1 mm.

[0028] According to the exemplary embodiment shown in FIG. 3, the dividing rib 13′ is arranged on the first inner tube piece 4 of the resonator 1′. At its end facing away from the inlet piece 6′, the first inner tube piece 4 has a ring-shaped lateral wall 12′, which forms the lateral delimitation of the first ring-shaped chamber 2′ in the direction of the outlet piece 7′ and is connected by means of the first inner tube piece 4 to the pot-like first jacket-sheath 9′, which opposite the dividing rib 13′ forms the outer wall 10′ of the first ring-shaped chamber 2′.

[0029] As shown in the exemplary embodiment depicted in FIG. 3, the outlet piece T transitions into the second inner tube piece 5. By means of the inner tube piece 5, the outlet piece 7′ penetrates the base 25 of a pot-shaped second jacket-sheath 26, the cylindrical wall of which is connected, at its end facing the first pot-shaped jacket sheath 9′, to the ring-shaped lateral wall 12′, which also forms a first lateral wall for a second ring-shaped chamber 27, the second lateral wall of which is formed by the base 25 of the second jacket-sheath 26.

[0030] As shown in the exemplary embodiment in FIG. 3, the first sub-chamber 14′ has no control fins. The second sub-chamber 15′ has two control fins 22′, 23′.

[0031] The first sub-chamber 14′ has wall apertures 28 in the first inner tube piece. The second sub-chamber 15′ has wall apertures 29 between the control fins 22′ and 23′ and has wall apertures 30 between the control fin 23′ and the lateral wall 12′.

[0032] The resonator 1″ in the exemplary embodiment shown in FIG. 5 has jacket-sheaths 9′, 26 corresponding to the exemplary embodiment of FIG. 3, with the inlet piece 6′ being connected to the first jacket-sheath 9′ and the outlet piece 7′ being connected to the second jacket-sheath 26. As per the exemplary embodiment in FIG. 5, the dividing rib 13″ is arranged on the first inner tube piece 4″ of the resonator 1″. At its end facing away from the inlet piece 6′, the first inner tube piece 4″ has a ring-shaped lateral wall 12″, which forms the lateral delimitation of the first ring-shaped chamber 2″ in the direction of the outlet piece 7′ and by means of which the first inner tube piece 4″ is connected to the pot-like first jacket-sheath 9′.

[0033] As shown in the exemplary embodiment in FIG. 5, the first sub-chamber 14″ has two control fins 22″, 23″ while the second sub-chamber 15″ has no control fins. The first sub-chamber 14″ has wall apertures 29″ between the control fins 22″ and 23″ and has wall apertures 30 between the control fin 23″ and the lateral wall 11′. The pot-like first jacket-sheath 9′ forms the outer wall 10″ of the first ring-shaped chamber 2″ opposite the dividing wall 13″. The second sub-chamber 15″ has wall apertures 28″ in the first inner tube piece 4″ between the dividing rib 13″ and the lateral wall 12″.

[0034] The embodiments discussed in the specific description and shown in the figures obviously represent merely illustrative embodiments of the present invention. For example, the inlet and outlet, i.e. the flow direction, can be reversed. In addition to being applied to cylindrical cross-sections, the functional principle can also be used in connection with other cross-sectional shapes. In the light of the present disclosure a person skilled in the art has a broad spectrum of optional variations available.

LIST OF REFERENCE NUMBERS

[0035] 1, 1′, 1″ resonator [0036] 2, 2′, 2″ first ring-shaped chamber [0037] 3 inner tube [0038] 4, 4″ first inner tube piece [0039] 5 second inner tube piece [0040] 6, 6′ inlet piece [0041] 7, 7′ outlet piece [0042] 8 longitudinal axis [0043] 9, 9′ first jacket-sheath [0044] 10, 10′, 10″ outer wall of 2 [0045] 11, 11′ lateral wall of 9 [0046] 12, 12′, 12″ lateral wall of 4 [0047] 13, 13′, 13″ dividing rib [0048] 14, 14′, 14″ first sub-chamber of 2 [0049] 15, 15′, 15″ second sub-chamber of 2 [0050] 16 annular space [0051] 17 gap of 13 [0052] 18 wall aperture of 3 [0053] 19 wall aperture of 3 [0054] 20 control fin of 14 [0055] 21 control fin of 14 [0056] 22, 22′, 22″ control fin of 15 [0057] 23, 23′. 23″ control fin of 15 [0058] 24 height of annular space 16 [0059] 25 base [0060] 26 second jacket-sheath [0061] 27 second ring-shaped chamber [0062] 28, 28″ wall aperture of 4 [0063] 29, 29″ wall aperture of 4 [0064] 30, 30″ wall aperture of 4