US4296780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus including throttling device for use in ventilation duct
Assignee: Carl Munters AB
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Filing: 1980-02-28
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Granted: 1981-10-27
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Expires: 2000-02-28
Abstract
Abstract An air jet cleaning apparatus for use with throttling devices mounted in ventilation ducts in which the throttling device includes a body having opposite air inlet and outlet sides and a plurality of fine through passages for conveying air flowing from the inlet to the outlet sides thereof. The apparatus includes a deflector shield mounted adjacent the inlet side of the body to allow for relative movement between the deflector and the body. The shield has an opening facing the inlet side of the body which is caused to sweep over the inlet side during relative movement between the shield and body. A duct provides communication between the shield and the outlet side of the throttling device whereby the drop of pressure across the throttling device diverts a partial air flow through the shield in another direction than the main air flow into the body of the throttling device in order to clean the surface of the inlet side of the body.
Inventors
- 👤 Per Norbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:23
CPC Classifications
F; F24; F24F; F24F13/00; F24F2221/00; F24F2221/22
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
222 words
An apparatus for use in ventilation ducts comprising a throttling device including a body having opposite air inlet and outlet sides and a plurality of fine elongated through passages extending therebetween and producing a pressure drop for conveying air flowing from said inlet through said elongated passages to said outlet side thereof, and deflector shield means mounted adjacent said inlet side of said body to allow relative movement of said body with respect thereto while cleaning the surface of said inlet side of the body, said apparatus including means for rotating one of said body and said deflector shield means relative to the other, said shield means having an opening facing said inlet side of the body which is caused to sweep over said inlet side of the body during such relative movement and means for providing flow communication between said shield means and the lower air pressure on the outlet side of the throttling device whereby the drop of pressure across the throttling device diverts a partial air flow through said shield means in another direction than the main air flow into the body of the throttling device in order to clean the surface of said inlet side of the body and then discharges said partial air flow downstream of the body in the same direction as the main air flow.
Claim 2
Independent Claim
222 words
An apparatus for use in ventilation ducts comprising a throttling device including a body having opposite air inlet and outlet sides and a plurality of fine elongated through passages extending therebetween and producing a pressure drop for conveying air flowing from said inlet through said elongated passages to said outlet side thereof, and deflector shield means mounted adjacent said inlet side of said body to allow relative movement of said body with respect thereto while cleaning the surface of said inlet side of the body, said apparatus including means for rotating one of said body and said deflector shield means relative to the other, said shield means having an opening facing said inlet side of the body which is caused to sweep over said inlet side of the body during such relative movement and means for providing flow communication between said shield means and the lower air pressure on the outlet side of the throttling device whereby the drop of pressure across the throttling device diverts a partial air flow through said shield means in another direction than the main air flow into the body of the throttling device in order to clean the surface of said inlet side of the body and then discharges said partial air flow downstream of the body in the same direction as the main air flow.
Claim 3
Dependent Claim
71 words
Apparatus as defined in claim 1, wherein said deflector shield means comprises a pair of deflector shields respectively mounted for relative movement with respect to said inlet and outlet sides of said throttling device, one of said shields including means for diverting air flow through the passages of the throttling device in a direction opposite to that of the main air flow through the throttling device, thereby to clean said passages.
Claim 4
Dependent Claim
115 words
Apparatus as defined in claim 2, wherein said means for providing communication comprises a hollow tubular shaft rotatably mounted centrally within said throttling device, a separator wall in said tube dividing the tubular shaft into two vertical air passages, respectively communicating with said shields whereby air flows through one of said tube passages to the deflector shield adjacent said outlet side of the throttling device and is deflected back through the throttling device in a direction opposite to the main flow to the other deflector shield adjacent the inlet side of the throttling device in which the air is deflected and returned back through the other tubular passage in the direction of the main flow.
Claim 5
Dependent Claim
17 words
Apparatus as defined in claim 3, wherein said shields are mounted to rotate with the tubular shaft.
Claim 6
Dependent Claim
44 words
Apparatus as defined in claim 4, wherein said means for rotating includes an air deflector vane rigidly mounted on one of said shields in the path of the flow of air entering the throttling device, for causing rotation of the shields and tubular member.
Claim 7
Dependent Claim
77 words
Apparatus as defined in claim 1, wherein said communication means includes a duct through which air may flow from said inlet to said outlet side thereof, said shield means communicating with said duct whereby as a result of the pressure drop across the throttling device said partial air flow passes into the shield means through the passages of the throttling device whereby the shield means, through said duct, communicates with the outlet side of the throttling device.
Claim 8
Dependent Claim
92 words
Apparatus as defined in claim 1, wherein said communication means includes a duct through which air may flow from said inlet to said outlet side thereof, said shield means communicating with said duct and being slightly spaced above said inlet side of the throttling device whereby, as a result of the pressure drop across the throttling device, said partial air flow passes into the shield means through the space between the shield means and the throttling device whereby the shield means, through the duct, communicates with the outside of the throttling device.
Claim 9
Dependent Claim
57 words
Apparatus, as defined in any of of claims 1 to 7, wherein said throttling device comprises a plurality of corruguated abutting sheets wherein the corrugations in adjacent sheets cross each other at an angle whereby the partial air flow passes to the interior of the deflector shield via the passages of the body of the throttling device.
Claim 10
Dependent Claim
32 words
Apparatus as defined in claim 1 wherein said means for rotating comprises a shaft rotatably mounted to the throttling device; said deflector shield means being secured to said shaft for rotation therewith.
Claim 11
Dependent Claim
48 words
Apparatus as defined in any of claims 1, 3, 6, 7 or 9 wherein said rotating means includes a deflector vane located on the inlet side of said throttling device to deflect a portion of the main air flow into a rotating flow pattern for rotating said shield.
Claim 12
Dependent Claim
217 words
The combination comprising a ventilation duct and a throttling device rotatably mounted in said duct including a body having opposite air inlet and outlet sides and a plurality of fine elongated through passages extending therebetween and producing a pressure drop for conveying air flowing from said inlet through said elongaged passages to said outlet side thereof, and deflector shield means fixed in said duct adjacent said inlet side of said body to allow relative movment of said body with respect thereto while cleaning the surface of said inlet side of the body, and means for rotating said body, said shield means having an opening facing said inlet side of the body which is caused to sweep over said inlet side of the body during rotation of the body and means for providing flow communication between said shield means and the lower air pressure on the outlet side of the throttling device whereby the drop of pressure across the throttling device diverts a partial air flow through said shield means in another direction than the main air flow into the body of the throttling device in order to clean the surface of said inlet side of the body and then discharges said partial air flow downstream of the body in the same direction as the main air flow.
Claim 13
Dependent Claim
217 words
The combination comprising a ventilation duct and a throttling device rotatably mounted in said duct including a body having opposite air inlet and outlet sides and a plurality of fine elongated through passages extending therebetween and producing a pressure drop for conveying air flowing from said inlet through said elongaged passages to said outlet side thereof, and deflector shield means fixed in said duct adjacent said inlet side of said body to allow relative movment of said body with respect thereto while cleaning the surface of said inlet side of the body, and means for rotating said body, said shield means having an opening facing said inlet side of the body which is caused to sweep over said inlet side of the body during rotation of the body and means for providing flow communication between said shield means and the lower air pressure on the outlet side of the throttling device whereby the drop of pressure across the throttling device diverts a partial air flow through said shield means in another direction than the main air flow into the body of the throttling device in order to clean the surface of said inlet side of the body and then discharges said partial air flow downstream of the body in the same direction as the main air flow.
Claim 14
Dependent Claim
48 words
Apparatus as defined in claim 11 wherein said rotating means includes guiding means on the inlet side of the throttling device in the ventilation duct for imparting a rotational movement to the main air flow, which movement is transferred to the throttling device to rotate the throttling device.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |