US4090434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable induction apparatus with a primary fluid flow controlled induction damper
Assignee: Pure Air Inc
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Filing: 1977-03-07
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Granted: 1978-05-23
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Expires: 1997-03-07
Abstract
Abstract A primary fluid nozzle induces secondary fluid flow through an induction port opening. A damper valve element is provided at the induction port and is constantly biased open. A variable flow fluid inlet is positioned to one side of the nozzle orifice and arranged to direct fluid against the induction port damper tending to close the damper depending upon the flow of fluid through the variable flow fluid inlet. Thus, when primary fluid flow increases through the variable flow inlet, the secondary fluid damper tends to be closed, reducing secondary fluid flow.
Inventors
- 👤 Michael L. Krisko
- 👤 Donald R. Pare
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:09
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/26; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F11/75; F24F2221/00; F24F2221/14; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87571; Y10T137/87587; Y10T137/87603; Y10T137/87643
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
334 words
An induction apparatus for a compressible fluid such as air as used in an air conditioning system and for mixing, by induced flow, primary fluid which may be conditioned with secondary fluid which may be unconditioned, comprising a housing having walls defining a compressible fluid inlet chamber and a separate compressible fluid outlet chamber and having a partition means between said chambers, said housing including means to connect said inlet chamber to a source of conditioned fluid and said housing also including an outlet to release fluid from said outlet chamber, said partition means including at least one constricted nozzle orifice for admitting compressible fluid from said inlet chamber to said outlet chamber, said partition means also including a variable flow fluid inlet positioned to one side of said nozzle orifice and adjacent to one outside wall of said housing, controllable means associated with said variable flow inlet for controllably varying the flow of primary fluid therethrough from said inlet chamber to said outlet chamber, an induction port opening in said wall of said housing in the portion thereof defining said outlet chamber, said induction port opening being arranged for communication with a source of secondary fluid, a damper valve element mounted within said induction port for closing said port and pivotally mounted to swing about an axis substantially perpendicular to the flow of fluid through said variable flow inlet, means for constantly biasing said induction port damper towards the open position, the pivotal mounting of said induction port damper being positioned so that the opening rotation of said induction port damper swings the downstream end of said damper into said outlet chamber of said housing and into the path of fluid from said variable flow inlet so that the flow of fluid from said variable flow inlet tends to close said damper, the opening and closing of said damper thus being controllable by the flow of fluid passing through said variable flow inlet to thereby control the volume of induced secondary fluid flow.
Claim 2
Dependent Claim
334 words
An induction apparatus for a compressible fluid such as air as used in an air conditioning system and for mixing, by induced flow, primary fluid which may be conditioned with secondary fluid which may be unconditioned, comprising a housing having walls defining a compressible fluid inlet chamber and a separate compressible fluid outlet chamber and having a partition means between said chambers, said housing including means to connect said inlet chamber to a source of conditioned fluid and said housing also including an outlet to release fluid from said outlet chamber, said partition means including at least one constricted nozzle orifice for admitting compressible fluid from said inlet chamber to said outlet chamber, said partition means also including a variable flow fluid inlet positioned to one side of said nozzle orifice and adjacent to one outside wall of said housing, controllable means associated with said variable flow inlet for controllably varying the flow of primary fluid therethrough from said inlet chamber to said outlet chamber, an induction port opening in said wall of said housing in the portion thereof defining said outlet chamber, said induction port opening being arranged for communication with a source of secondary fluid, a damper valve element mounted within said induction port for closing said port and pivotally mounted to swing about an axis substantially perpendicular to the flow of fluid through said variable flow inlet, means for constantly biasing said induction port damper towards the open position, the pivotal mounting of said induction port damper being positioned so that the opening rotation of said induction port damper swings the downstream end of said damper into said outlet chamber of said housing and into the path of fluid from said variable flow inlet so that the flow of fluid from said variable flow inlet tends to close said damper, the opening and closing of said damper thus being controllable by the flow of fluid passing through said variable flow inlet to thereby control the volume of induced secondary fluid flow.
Claim 3
Dependent Claim
64 words
Apparatus as claimed in claim 1 wherein said variable flow inlet and said controllable means associated with said variable flow inlet and said induction port damper are positioned and arranged to provide for a direct flow of primary air from said variable flow inlet along the inside surface of said induction port damper whenever said variable flow inlet is opened by said controllable means.
Claim 4
Dependent Claim
44 words
Apparatus as claimed in claim 1 wherein said housing includes a constriction downstream from said induction port damper within said outlet chamber to provide a venturi action in entraining secondary fluid in the flow of primary fluid in order to enhance the induction effect.
Claim 5
Dependent Claim
45 words
Apparatus as claimed in claim 3 wherein said downstream constriction within said outlet chamber and said outlet to release fluid from said outlet chamber are combined to form in combination in said housing a diffuser structure for diffusing the released fluid into the conditioned space.
Claim 6
Dependent Claim
74 words
Apparatus as claimed in claim 4 wherein said housing and said inlet and outlet chambers and said variable flow inlet and said controllable means for controllably varying the flow of primary fluid through said variable flow inlet and said induction port and said damper valve element are all elongated in a dimension transverse to the general direction of fluid flow to thus provide a substantially long narrow apparatus with a long narrow diffuser outlet.
Claim 7
Dependent Claim
35 words
Apparatus as claimed in claim 4 wherein two separate downstream constrictions are provided within said outlet chamber for diffusing the released fluid into the conditioned space in at least two different directions for greater diffusion.
Claim 8
Dependent Claim
46 words
Apparatus as claimed in claim 1 wherein said controllable means associated with said variable flow inlet for controllably varying the flow of primary fluid therethrough from said inlet chamber to said outlet chamber comprises a pneumatically expansible oval casing device arranged within said variable flow inlet.
Claim 9
Dependent Claim
89 words
Apparatus as claimed in claim 1 wherein a plurality of variable flow fluid inlets are provided within said partition means between said inlet and outlet chambers each adjacent to one outside wall of said housing, and wherein separate controllable means are associated with each of said variable flow inlets, and wherein there is further provided an induction port opening and a damper valve element associated with each of said variable flow inlets and respectively controllable by said respective variable flow inlets by variation of the primary fluid flow therethrough.
Claim 10
Dependent Claim
94 words
Apparatus as claimed in claim 1 wherein said induction port damper valve element comprises a substantially rectangular structure elongated parallel to the pivot axis and wherein the pivot axis is substantially centered within said damper valve element so that part of said damper valve element swings into said housing and part of said damper valve element swings out of said housing during an opening movement thereof, the part of said damper valve element swinging into said housing comprising the downstream end of said damper valve element with respect to the flow of primary fluid.
Claim 11
Dependent Claim
91 words
Apparatus as claimed in claim 9 wherein said induction port is in a substantially vertical wall of said housing and said damper valve element is vertically arranged in the closed position, and wherein said means for constantly biasing said induction port damper towards the open position is combined in the structure of said damper valve element in the provision that the pivotal mounting of said damper valve element is horizontally offset towards the interior of said housing from the center of gravity of the main body of said damper valve element.
Claim 12
Dependent Claim
30 words
Apparatus as claimed in claim 9 wherein said induction port damper valve element has a cross section perpendicular to said pivot axis which is substantially shaped like a letter S.
Claim 13
Dependent Claim
53 words
Apparatus as claimed in claim 9 wherein said means for constantly biasing said induction port damper towards the open position comprises an offset of the pivotal mounting of said induction port damper with respect to the center of gravity of said damper to thereby provide a natural gravity bias towards the opening direction.
Claim 14
Dependent Claim
50 words
Apparatus as claimed in claim 1 wherein said means for constantly biasing said induction port damper towards the open position comprises a substantially horizontally extending arm attached to said damper valve element and including a weight adjustably positionable upon said arm for providing a gravity force bias upon said damper.
Claim 15
Dependent Claim
27 words
Apparatus as claimed in claim 1 wherein said means for constantly biasing said induction port damper comprises a spring device connected between said damper and said housing.
Claim 16
Dependent Claim
41 words
Apparatus as claimed in claim 1 wherein there is provided an adjustable stop member in the wall of said housing adjacent to said damper valve element for adjustably maintaining said damper valve element partially open when in the maximum closed position.
Claim 17
Dependent Claim
51 words
Apparatus as claimed in claim 1 wherein said damper valve element is pivotally mounted to said housing at the upstream edge thereof with respect to the normal direction of flow of primary fluid, and wherein said damper valve element is arranged to swing inwardly into said housing during opening movement thereof.
Claim 18
Dependent Claim
62 words
Apparatus as claimed in claim 16 wherein said induction port is positioned in an upper horizontal wall of said housing and wherein said means for constantly biasing said induction port damper towards the open position is provided by the weight of said damper valve element which tends to cause said damper valve element to drop by gravity force into the open position.
Claim 19
Dependent Claim
50 words
Apparatus as claimed in claim 16 wherein said means for constantly biasing said induction port damper towards the open position comprises a substantially horizontally extending arm attached to said damper valve element and including a wieght adjustably positionable upon said arm for providing a gravity force bias upon said damper.
Claim 20
Dependent Claim
27 words
Apparatus as claimed in claim 16 wherein said means for constantly biasing said induction port damper comprises a spring device connected between said damper and said housing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |