Silencer device

• US 4,127,183 A
• Filed: 02/17/1978
• Issued: 11/28/1978
• Est. Priority Date: 02/17/1978
• Status: Expired due to Term

• Current Assignee: AAF-McQuay Incorporated (Daikin Industries Ltd)
• Original Assignee: American Air Filter Co., Inc. (Daikin Industries Ltd)
• Inventors: McLarty, Tom E.
• Primary Examiner(s): Hix, L. T.
• Assistant Examiner(s): Fuller, Benjamin R.
• Application Number:
  US05/878,818
• Time in Patent Office: 284 Days
• Field of Search: 181/218, 181/220, 181/222, 181/224, 181/284, 181/293
• US Class Current: 181/224
• CPC Class Codes: F01N 1/10 in combination with sound-absorbing materials F01N1/125 takes precedence
• CPC Class Codes: F01N 13/18 Construction facilitating manufacture, assembly, or disassembly
• CPC Class Codes: F01N 13/1844 Mechanical joints
• CPC Class Codes: F01N 2450/24 by bolts, screws, rivets or the like
• CPC Class Codes: F01N 2470/10 Tubes having non-circular cross section
• CPC Class Codes: F16L 55/02763 using an element with multiple tubes

Abstract

A silencer device for attenuating fluid borne noise has a flow through housing with an open upstream end for the entrance of a fluid into the housing and a coaxial open downstream end for exhausting the fluid from the housing. An entrance header formed of a plurality of spaced apart intersecting elongated members defining a plurality of rectangular entrance apertures, each elongated member having a V-shaped transverse cross-section shape and oriented with its apex pointed in an upstream direction, is coextensively disposed over the upstream open end. An exhaust header also formed of a plurality of spaced apart intersecting elongated members defining a plurality of rectangular exhaust apertures, each elongated member having a V-shaped transverse cross-section shape and oriented with its apex pointed in a downstream direction, is coextensively disposed over the downstream open end. A plurality of open ended fluid flow tubes having perforated longitudinal walls extends between the entrance header and exhaust header. Each flow tube has one of its open ends in registration with a different one of the rectangular entrance apertures of the entrance header. Likewise, the opposite open end of each flow tube is in registration with a different one of the rectangular exhaust apertures of the exhaust header. The interior of the housing is packed with a sound absorbing material to surround the perforated longitudinal walls of the flow tubes.

Claims

1. A silencer device for attenuating fluid borne noises, comprising:

(a) a flow through housing having an open upstream end for the entrance of a fluid into the silencer device and an open downstream end for the exhausting of the fluid from the silencer device coaxial with the open upstream end;

(b) a fluid entrance header disposed coextensively across the open upstream end of the housing and connected to the housing, the fluid entrance header comprising;

a plurality of parallel spaced apart first elongated members, each first elongated member having a V-shaped transverse cross-section; and

,

a plurality of parallel spaced apart second elongated members normally disposed to and intersecting the plurality of first elongated members, each of the second elongated members having a V-shaped transverse cross-section with an included angle generally equal to the included angle of the V-shaped cross-section of the first elongated members, each of the second elongated members having formed therein a plurality of pairs of transversely aligned V-shaped notches longitudinally spaced apart along its length, the configuration of each pair of notches conforming to the V-shaped cross-section of the first elongated member nestingly receives a different one of the first elongated members;

the first elongated members and second elongated members of the entrance header cooperate to define a plurality of generally rectangular entrance apertures.

3. The silencer device of claim 1, wherein the entrance header further comprises:

(a) each end of each first elongated member being chamfered with a slope substantially equal to one half of the included angle of the V-shaped cross-section of the first elongated member;

(b) each end of each second elongated member being chamfered with a slope substantially equal to one half of the included angle of the V-shaped cross-section of the second elongated member;

(c) a peripheral frame comprising;

a first pair of parallel spaced apart elongated generally planar members, each generally planar member of the first pair being disposed parallel to the second elongated members, one plate member being attached to one of the chamfered ends of each of the first elongated members, and the other plate member of the first pair of elongated members being attached to the other one of the chamfered ends of each of the first elongated members; and

,

a second pair of parallel spaced apart elongated flat plate members, each plate member of the second pair being disposed parallel to the first elongated members, one plate member being attached to one of the chamfered ends of the second elongated members, and the other plate member of the second pair being disposed parallel to the first elongated members and attached to the other chamfered ends of the second elongated members.

8. The silencer device of claim 3, further comprising:

a plurality of parallel elongated open ended fluid flow tubes interconnecting the entrance header with the outlet header to provide fluid flow paths through the housing, each of the fluid flow tubes being of generally rectangular cross-sectional shape and having foraminous longitudinal walls, one end of each of the flow tubes being open and in registration with a different one of the rectangular entrance apertures of the entrance header, and the other end of each of the flow tubes being open and in registration with a different one of the rectangular exhaust apertures of the exhaust header.

2. A fluid exhaust header disposed coextensively across the open downstream end of the housing and connected to the housing, the fluid exhaust header comprising:

a plurality of parallel spaced apart first elongated members, each first elongated member having a V-shaped transverse cross-section; and

,

a plurality of parallel spaced apart second elongated members normally disposed to and intersecting the plurality of first elongated members, each of the second elongated members having a V-shaped transverse cross-section with an included angle substantially equal to the included angle of the V-shaped cross-section of the first elongated members, each of the second elongated members having formed therein a plurality of pairs of aligned V-shaped notches longitudinally spaced apart along its length, the configuration of each pair of notches conforming to the V-shaped cross-section of the first elongated members, each pair of V-shaped notches in each second elongated member nestingly receives a different one of the first elongated members;

the first elongated members and second elongated members of the exit header cooperate to define a plurality of generally rectangular exit apertures.

4. The silencer device of claim 2, wherein the exhaust header comprises:

(a) each end of each first elongated member being chamfered with a slope substantially equal to one half of the included angle of the V-shaped cross-section of the first elongated member;

(b) each end of each second elongated member being chamfered with a slope substantially equal to one half of the included angle of the V-shaped cross-section of the second elongated member;

(c) a peripheral frame comprising;

a first pair of parallel spaced apart elongated flat plate members, each plate member of the first pair being disposed parallel to the second elongated members, one plate member being attached to one of the chamfered ends of the first elongated members, and the other plate of the first pair being attached to the other chamfered ends of the first elongated members; and

,

a second pair of parallel spaced apart elongated flat plate members, each plate member of the second pair being disposed parallel to the first elongated members, one plate member being attached to one of the chamfered ends of the first elongated members, and the other plate member of the second pair being attached to the other chamfered ends of the first elongated members.

5. The silencer device of claim 4 wherein:

each second elongated member of the entrance header further comprises a mounting flange extending from between adjacent longitudinally spaced apart notches of each longitudinally spaced apart pair of V-shaped notches in a direction axially of the housing toward the downstream end of the housing; and

,

each second elongated member of the exhaust header further comprises a mounting flange extending from between adjacent longitudinally spaced apart notches of each longitudinally spaced apart pair of V-shaped notches in a direction axially of the housing toward the upstream end of the housing.

6. The silencer device of claim 4 wherein:

each chamfered end of each first elongated member of the entrance header has two oppositely extending attaching flange projecting generally transversely of the longitudinal axis of the first elongated member in a direction generally outwardly from the first elongated member for attaching each of the opposite chamfered ends of the first elongated member to a different one of the first pair of elongated flat plate members;

each chamfered end of each second elongated member of the entrance header has two oppositely extending attaching flanges projecting generally transversely of the longitudinal axis of the second elongated member in a direction generally outwardly from the second elongated member for attaching each of the opposite chamfered ends of the second elongated member to a different one of the second pair of elongated flat plates;

each chamfered end of each first elongated member of the exhaust header has two oppositely extending attaching flanges projecting generally transversely of the longitudinal axis of the first elongated member in a direction generally outwardly from the first elongated member for attaching each of the opposite chamfered ends of the first elongated member to a different one of the first pair of elongated flat plate members; and

,

each chamfered end of each second elongated member of the exhaust header has two oppositely extending attaching flanges projecting generally transversely of the longitudinal axis of the second elongated member in a direction generally outwardly from the second elongated member for attaching each of the opposite chamfered ends of the second elongated member to a different one of the second pair of elongated flat plate members.

7. The silencer device of claim 6 wherein:

each end of each one of the second elongated flat plate members of the entrance header is chamfered with a slope substantially equal to the slope of the chamfered ends of the first pair of elongated members;

each chamfered end of each of the second elongated flat plate members of the entrance header has an attaching flange extending generally transversely to the longitudinal axis of the second elongated plate member for attaching each end of each second elongated flat plate member to the adjacently disposed one of the pair of first elongated flat plate members,

each end of each one of the second elongated flat plate members of the exhaust header is chamfered with a slope substantially equal to the slope of the chamfered ends of the first pair of elongated members; and

,

each chamfered end of each of the second elongated flat plate members of the exhaust header has an attaching flange extending generally transversely from the longitudinal axis of the second elongated plate member for attaching each end of each second elongated flat plate member to the adjacently disposed one of the pair of first elongated flat plate members.

9. The silencer device of claim 6, further comprising:

a plurality of parallel elongated open ended fluid flow tubes interconnecting the entrance header with the outlet header to provide fluid flow paths through the housing, each of the fluid flow tubes being of generally rectangular cross-sectional shape and having foraminous longitudinal walls, one end of each of the flow tubes being open and in registration with a different one of the rectangular entrance apertures and mounted to the mounting flanges extending from the second elongated members bordering the entrance aperture in which that open end of that flow tube is in registration and the other end of each of the flow tubes being open and in registration with a different one of the rectangular exhaust apertures and mounted to the mounting flanges extending from the second elongated members bordering the exhaust aperture in which the open end of that flow tube is in registration.