当前申请(专利权)人地址：
Tetbury Hill, Malmesbury, Wiltshire, SN16 0RP, United Kingdom
摘要：
A noise attenuator 220, such as a noise damping resonator for a vacuum cleaner, comprises an inner element having an axially extending inner wall 222 that encloses a hollow interior, at least a portion of the inner wall being perforated. An outer wall extends around the inner wall to enclose the perforated portion and to define a cavity 238 there around. A set of partition walls 240, 242 extend within the cavity from the inner wall to the outer wall to partition the cavity into sub-cavities 244, the set of partition walls comprising at least one circumferential partition wall 240 that extends circumferentially around the inner wall. At least one circumferential partition wall may be orthogonal to, or inclined to a radial plane intersecting, a central axis 224 of the inner element. The set of partition walls may comprise at least one axial partition wall 242 extending parallel to the central axis. The inner element may be open at each axial end or may comprise an end wall that closes an axial end thereof.
权利要求：
Claims
1. A noise attenuator, comprising:
an inner element that comprises an axially-extending inner wall that
encloses a hollow interior, at least a portion of the inner wall being perforated;
an outer wall extending around the inner wall to enclose the perforated
portion of the inner wall and to define a cavity surrounding the perforated portion
of the inner wall: and
a set of partition walls extending within the cavity from the inner wall to the
outer wall to partition the cavity into sub-cavities, the set of partition walls
comprising at least one circumferential partition wall that extends circumferentially
around the inner wall.
2. The noise attenuator of claim 1, wherein the set of partition walls comprises
multiple circumferential partition walls.
3. The noise attenuator of claim 2, wherein at least two circumferential partition walls
of the set extend in respective parallel planes.
4. The noise attenuator of claim 2 or claim 3, wherein the circumferential partition
walls are regularly spaced axially along the inner wall.
5. The noise attenuator of any preceding claim, wherein at least one circumferential
partition wall of the set extends substantially orthogonally to a central axis of the
inner element.
6. The noise attenuator of any preceding claim, wherein at least one circumferential
partition wall of the set is inclined relative to a radial plane intersecting a central
axis of the inner element.
/. The noise attenuator of any preceding claim, wherein at least one circumferential
partition wall of the set is annular.
8. The noise attenuator of any preceding claim, wherein the sub-cavities are mutually
isolated.
9. The noise attenuator of any preceding claim, wherein the set of partition walls
comprises at least one axial partition wall that extends axially along the inner wall.
10. The noise attenuator of claim 9, wherein the at least one axial partition wall
extends parallel to a central axis of the inner element.
11. The noise attenuator of claim 9 or claim 10, comprising multiple axial partition walls
that are angularly spaced around the inner wall.
12. The noise attenuator of claim 11, wherein the axial partition walls are regularly
spaced around a central axis of the inner element.
13. The noise attenuator of any preceding claim, wherein the or each partition wall
extends orthogonally to the inner wall.
14. The noise attenuator of any preceding claim, wherein each sub-cavity extends
continuously from the inner wall to the outer wall.
15. The noise attenuator of any preceding claim, comprising a plane of symmetry that
is orthogonal to a central axis of the inner element.
16. The noise attenuator of claim 15, wherein the plane of symmetry intersects an
axial midpoint of the inner element.
17. The noise attenuator of any preceding claim, wherein the outer wall connects to
the inner wall through axially-spaced end walls that extend transversely between
the inner wall and the outer wall.
18. The noise attenuator of claim 17, wherein the outer wall and the end walls
collectively define an impermeable outer shell that encloses the cavity.
19. The noise attenuator of any of claims 1 to 16, wherein the outer wall connects
directly to the inner wall to define an impermeable outer shell that encloses the
cavity.
20. The noise attenuator of any preceding claim, wherein the inner wall is tubular.
21. The noise attenuator of any preceding claim, wherein the outer wall has circular
symmetry around a central axis of the inner element.
22. The noise attenuator of any preceding claim, wherein the inner element is
arranged concentrically with the outer wall.
23. The noise attenuator of any preceding claim, wherein the inner element is open at
each axial end.
24. The noise attenuator of any of claims 1 to 22, wherein the inner element comprises
an end wall that closes an axial end of the inner element.
25. The noise attenuator of any preceding claim, wherein the cavity and perforations
of the perforated portion of the inner wall together define a noise-damping
resonator.
26. The noise attenuator of any preceding claim, wherein the perforated portion of the
inner wall comprises no perforations having a width of more than 1mm.
27. The noise attenuator of any preceding claim, wherein the perforated portion of the
inner wall comprises no perforations having a width of less than 0.5mm.
28. The noise attenuator of any preceding claim, wherein the perforated portion of the
inner wall has a perforation ratio of between 1% and 5%.
29. The noise attenuator of any preceding claim, wherein a transverse v
outer wall varies axially.
30. A device comprising the noise attenuator of any preceding claim.