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Publication numberUS3792593 A
Publication typeGrant
Publication dateFeb 19, 1974
Filing dateAug 10, 1972
Priority dateAug 10, 1972
Publication numberUS 3792593 A, US 3792593A, US-A-3792593, US3792593 A, US3792593A
InventorsLoos J, Wark E
Original AssigneeGen Motors Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fresh air damper arrangement for room air conditioner
US 3792593 A
Abstract
An air conditioning unit having a louvered fresh air opening located in an evaporator blower scroll housing side wall in the vertical exhaust air passageway such that recirculated room air from the blower wheel is passed over a plurality of angularly disposed horizontally extending louvers cooperating with the upward flow of air in the scroll housing thereover present Venturi creating deflectors which draw outside fresh or make-up air into the scroll housing to be mixed with the recirculated conditioned room air. A damper door and overlying three-sided channel duct are positioned on the condenser compartment side of the louvers such that when the door is opened it forms an elbow duct scoop-like air intake conduit directing a portion of the outside air flow through the louvered scroll housing opening and when the door is closed the open-sided channel duct presents minimal interference with the outside air being drawn into the condenser compartment by fan means for cooling the condenser.
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Description  (OCR text may contain errors)

ited States atent 1191 Loos et al.

[ 1 Feb. 19., 1974 [75] Inventors: John H. Loos, Dayton; Emerson L.

Wark, Vandalia, both of Ohio General Motors Corporation, Detroit, Mich.

Aug. 10, 1972 [73] Assignee:

[51] Int. Cl. lF25d 23/12 [58] Field of Search 62/427, 428, 429, 262

Primary Examiner-William J. Wye Attorney, Agent, or Firm-Edward P. Barthel References Cited UNITED STATES PATENTS Cohler 62/262 62/262 62/427 Webster 62/427 5 7] ABSTRACT An air conditioning unit having a louvered fresh air opening located in an evaporator blower scroll housing side wall in the vertical exhaust air passageway such that recirculated room air from the blower wheel is passed over a plurality of angularly disposed hori zontally extending louvers cooperating with the upward flow of air in the scroll housing thereover present Venturi creating deflectors which draw outside fresh or make-up air into the scroll housing to be mixed with the recirculated conditioned room air. A damper door and overlying three'sided channel duct are positioned on the condenser compartment side of the louvers such that when the door is opened it forms an elbow duct scoop-like air intake conduit directing a portion of the outside air flow through the louvered scroll housing opening and when the door is closed the open-sided channel duct presents minimal interference with the outside air being drawn into the condenser compartment by fan means for cooling the condenser.

3 Claims, 5 Drawing [Figures FRESII AIR DAMPER ARRANGEMENT FOR ROOM AIR CONDITIONER This invention relates to a fresh air damper assembly for a room air conditioning unit and in particlar to an improved damper door and baftle apparatus for controlling the admittance of fresh or make-up air into the evaporator blower scroll housing of the unit.

Air conditioner units employ many methods of bringing in and controlling the flow of fresh air for mixture with the recirculated room air to dissipate smoke, cooking and other foul odors which may accumulate in the conditioned area. For example, US. Pat. No. 3,305,162, issued Feb. 21, 1967 to W. B. Hall, Jr. discloses a damper door which in one position is projected into a room air discharge chamber as an air deflector to create a zone of low pressure by a Venturi action or suction which acts to draw outside fresh air into the chamber for mixture with the air stream discharged from the evaporator blower into the room being conditioned. The prior art, however, fails to teach a satisfactory damper arrangement for drawing fresh air directly into the evaporator blower scroll casing for mixture with the recirculated air therein prior to its exhaust into duct means for subsequent discharge into the room.

It is therefore an object of this invention to provide a simple, efficient damper arrangement for the evaporator blower scroll housing of a room air conditioning unit allowing the blower wheel to draw in fresh or make-up air through a first opening in the weather casing and thence into a second louvered opening in the blower scroll side opening located in the wall of the widening spiral passageway in combination with a damper door and cooperating channel-shaped duct such that when opened the door closes one end of the channel-shaped duct forming a scoop-like dihedral conduit directing outside air through the louvered second opening into the scroll widening spiral passageway and upon closure of the door the channel-shaped duct presents minimal obstruction turbulence to the flow of outside air being drawn into the condenser chamber by the condenser fan.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings wherein a preferred embodiment of the present invention is clearly shown.

IN THE DRAWINGS FIG. I is a top plan view of a room air conditioner having an arrangement according to the invention;

FIG. 2 is an enlarged fragmentary horizontal section taken along the line 2-2 of FIG. 3;

FIG. 3 is an enlarged fragmentary elevational plan view taken along the lines 3-3 of FIG. 1;

FIG. 4 is a vertical sectional view taken along the lines 4-4 of FIG. 3;

FIG. 5 is an enlarged perspective view of the door hinge clip.

Referring now to the drawings and more particularly to FIG. I, there is shown a window air conditioner unit having a weather casing enclosing a sealed motor compressor unit 22, a support bracket 24 for a fan motor 25, having a propeller fan 26 mounted on one end of motor shaft 27 which draws in outside air via suitable side louvers 28 and 29 through a condenser 30 and discharge through louvers 31 at the back of the casing 20 to the outside air. A suitable condenser shroud 35 is provided with a beIlmouth propeller fan orifice 32 to define a condenser air chamber 33.

A transverse upright bulkhead partition 34 extends across the casing 20 to divide the interior of the air conditioning unit into an inner evaporator compartment 36 and the outer compartment 33 exposed to the outside air. The bulkhead partition 34 includes vertical wall sections 39 and 40 and top wall section 411. Spaced below the top wall 411 is a horizontal shelf, partially indicated at 42 in FIG. 3, which together with the end walls 43 and 44 define an upper room air discharge chamber 46 having a conditioned air outlet 48 extending across the front of the air conditioning unit.

An evaporator 56 is located in front of a centrifugal blower, including a blower wheel. SI mounted on the other end of the electric motor shaft 27 within a blower scroll housing 52 which is generally spiral in cross section. For further details of a typical scroll housing structure reference should be had to aforementioned Hall US. Pat. No. 3,305,162, the disclosure of which is incorporated by reference herein. The room air enters the scroll housing through a bellmouth inlet orifice 53 in its inner sidewall 54 and is directed into a generally vertical exhaust passageway 49 having a widening spiral form leading to scroll air outlet opening 56 defined by skewed curled edge cutoff 57 at the throat section of the scroll housing. The scroll housing outer side wall is formed by partition wall section 40 which has an opening through which the fan motor shaft 27 extends so as to position the blower wheel 51 asymmetrically within the scroll housing 52 parallel to the spiral wall 55, with the blower wheel 54 having forwardly curved blades 59 for producing the maximum high velocity discharge when driven in a counterclockwise direction (FIG. 3) by the motor 25. The sealed motor compressor unit 22, the condenser 30 and the evaporator 50 are connected together in an operative refrigerant circuit such as may be similar to that shown in the Gould et al US. Pat. No. 2,945,362, issued July 19, 1960.

The scroll housing outer side wall 40 has a generally rectangular fresh air intake opening 60 located in the widening spiral form exhaust passageway of the scroll housing 52. A louvered insert member 61 which in the form shown is integrally molded of plastic material is suitably secured in the opening 60 such as by cementing material and has a plurality of upwardly and inwardly directed horizontally disposed louvers 62. By virtue of the blower wheel 51 directing air upwardly over the louvers in the passageway 49 a zone of low pressure is created by a venturi action which will draw in outside air through a first opening in the form of casing side louvers 29 and a second opening 60 into the outflowing air stream forced through the scroll housing outlet 56 into discharge chamber 46.

As best shown in FIG. 2, a closure member or damper door is provided for the louvered opening 66 located on the outer compartment 38 side of the wall 40 and may be selectively opened and closed for alternatively mixing fresh or outside makeup with recirculated room air either with or without cooling circulated by the blower 34.

In the preferred embodiment the door 76 is formed from a sheet metal blank having a base panel 63 the marginal edges of which have inturned right-angled side flange 64, obtuse angled side flange 65, and rightangled end flanges 66 defining a pan-like member into which is received a conforming rectangular sheet of sponge-like foam sealing material such as polyurethane foam 67 of sufficient thickness, about one-quarter inch in the disclosed form, having a pressure sensitive adhesive removable backing for securing to the inner surface of the base panel 63 to effectively seal the outer edge of a substantially rectangular frame portion 68 integrally molded on the outer side of the louvered insert member 61. If desired a screening 71 can be inserted in the frame 68 to prevent the entrance of bugs or other foreign matter within the scroll casing.

As best seen in FIGS. 2, and 6, a pair of hinge fasteners 72 and 73 are used in the disclosed embodiment to hingedly connect the door 70 to the outer wall 40. The hinge fasteners 72 comprise a U-shaped resilient clip portion 74 which snaps over integrally molded upper and lower rib members 75 and '76 on the outer wall 40 and are securely retained on the ribs by lanced inwardly directed pairs of barbs 77 and 78 struck from the clip adjacent its open end. Each hinge fastener 72 and 73 has an elongate outwardly extending integral arm 80 disposed at right angles to the U-shaped clip 74 with the outer end of the arm being bent to provide an inwardly curved finger 82 having a hook-like end thereon for extending into elongated apertures 84 located along the obtuse angled side flange 65 of the door. The side flange 65 is formed at an obtuse angle to allow for clearance with the frame 68 when the door is moved to its open position. Narrow tabs 86 are lanced and bent outwardly from the arms 80 to provide stop means to limit the amount of insertion of the hooklike fingers 82 into the elongated door apertures 84.

Fresh air duct means in the form of an inverted openended three-sided box-shaped channel duct 90, preferably formed of sheet metal, has an outwardly spaced vertical back wall 92 overlying the intake louvered opening 61 and inwardly extending upper and lower walls 94 and 96 each having an outwardly directed mounting foot flange shown at 98 and 100 in FIG. 4. The back wall or baffle plate 92 is of sufficient dimension so as to span the louvered insert opening 61 in a lengthwise direction and is positioned in a plane substantially parallel to the plane of door 70 when in its closed position. The foot flanges 98 and 100 have vertically offset holes formed therein for the reception of screws 102 for securing the channel-shaped duct member 90 to the wall 40. lt'will be noted in FIG. 2 that the baffle plate 92 is provided with an outwardly directed right-angled air divider flange 104 substantially parallel with the sides of the casing 20. The air divider flange 104 is positioned to be substantially co-planar with the free edge side flange 64 of the door when in its closed position with free edge flange 64 contacting the back wall 92 at an angle A of about 45 degrees, as shown in phantom lines in FIG. 2, to form a scoop-like elbow duct air intake for capturing a portion of the outside air entering through the first air opening 29 of the air conditioner casing 20.

The air divider flange 104 serves as a cut-off to separate the air stream entering through first intake opening 29 and assists in preventing the negative pressure in compartment 38 from drawing the bulk of the incoming fresh air away from the entrance 106 of channel duct 90 for passage through condenser fan orifice 32. It will be noted in FIG. 4 that the channel duct 90 has a vertical dimension to provide a clearance space 108 between its horizontal walls 94, 96 and the door end flanges 66 to insure against vibrational contact therebetween and thereby eliminate a possible source of noise.

The louvers 62 comprise a series of horizontally extending upwardly and inwardly directed baffles which divide the entering air path through second air opening 60 into a plurality of vertical portions so that the fresh make-up air is directed toward the upper scroll outlet 56. With a louvered arrangement of this type, wherein the louvers are separated, negative pressures created in the blower scroll housing 52 are equalized over the inner face of the opening 61) so as to spread the air evenly across the entire height thereof so that fresh air is drawn into the scroll housing for blending with the recirculated room air with a minimum of turbulence.

A fresh air push-pull control slide 1 16 with flange tab 1 17 is provided on the face of the unit to permit control of the fresh air damper assembly through means of a stiff wire 1 18 which has a sheathed portion 128 extending through a suitable opening in the casing 20, wall 54 and elongated opening 124 in wall 411 with the wire 118 having a hooked-end 126 (FlG. 2) for insertion through a door opening 122 adjacent the side flange 64. Thus, as shown in FIG. 2 the door is closed by moving tab 117 to the left causing a pull-force on the wire 1 18 and when it is desired to open the door the tab 117 is moved to the left causing a push-force on the wire to move the door to its open phantom line position in FIG. 2. An outwardly directed protrusion 129 is formed in the baffle plate 92' to allow the hooked end 126 to be received in the protrusion permitting the door 70 to be opened to its maximum extent as shown in FIG. 2. In addition inwardly grooved gussets 130 and outwardly grooved gussets 131 are formed at the corner juncture of the channel-shaped baffle duct to impart rigidity thereto.

in the exemplified embodiment the blower wheel 51 is arranged in the scroll housing and by means of spokes 132 and centered hub 133 the shaft 27 is driven in a counterclockwise direction (FIG. 3) as indicated by the arrow 134. The forwardly curved blower wheel blades 59 cause routing of the high velocity air flowing in passageway 49 to be directed upwardly over the horizontal angularly disposed louvers 62 to provide a series of Venturi creating deflectors for drawing in fresh air through second fresh air intake opening in the form of louvered insert 61. The decrease in air pressure relative to the air pressure of the fresh air being directed through the scoop-like elbow duct 90 arrangement creates a negative air differential which assists in drawing secondary or fresh air through the louvered insert opening 61 for mixture with primary room air being routed over the louvers 62 for subsequent discharge through the scroll exhaust outlet 56.

One of the principal features of the applicants invention results from the fact that when the door 78 is in its closed position the open-ended channel-shaped duct member 90 provides a minimum of obstruction or turbulence to outside air being drawn into the outer chamber 38 by the condenser fan 26 for movement through the bell-shaped orifice 32.

It will be noted that the upstream edges of the upper, lower and back walls 94, 96 and 92, respectively, are positioned in close proximity to the first louvered air intake opening 29 so as to envelop a portion thereof to enable the channel duct 90 to direct a substantial quantity of fresh air into the scroll housing when the door 70 is opened with its vertical free flanged edge contacting the back wall 92 approximately midway between its upstream edge, in the form of flange 1G4, and its downstream edge terminating a short distance outboard of the door hinge apertures 84.

While the embodiment of the present invention as herein disclosed constitutes a preferred form, it is to be understood that other forms might be adopted.

We claim:

1. In a room air conditioning unit, the combination comprising: a casing enclosing a condenser compartment and an evaporator compartment separated by a transverse partition, a first intake opening in a side wall of said casing and positioned for delivery of outside fresh air into said condenser compartment, said partition forming the outer vertical side wall of a centrifugal impeller scroll housing, said scroll housing having an inner side wall spaced therefrom including an air intake orifice therein for receiving a stream of recirculated room air drawn through said evaporator compart ment for subsequent discharge via the scroll housing exhaust passage into the room, a second rectangular fresh air intake opening in said scroll housing outer side wall having a plurality of inwardly and upwardly in clined horizontally disposed louvers extending into said scroll housing air exhaust passage, a rectangular damper door pivotally disposed on the condenser compartment side of said scroll housing outer side wall closing said second fresh air intake opening, selective actuator means for moving said door between its closed position and an open position inclined outwardly into the path of the inward flow of fresh air flow through said first intake opening, duct means supported on said partition in the form of a three-sided box-like channel having horizontal upper and lower walls and a vertical back wall overlying said second intake opening, said channel back wall spaced rearwardly of said second intake opening so as to be located in a plane parallel to the plane of said door in its closed position; said upper, lower and back walls of said channel duct presenting a minimum of obstruction to the incoming flow of condenser cooling outside air when said door is in its closed position, said door when in its opened position having its free vertical edge positioned contacting said channel duct back wall so as to form with said upper and lower walls a scoop-like elbow duct to direct a portion of the fresh air entering through said first intake opening to flow through said second opening, said louvers cooperating with the upward flow of recirculated air in said scroll-housing exhaust passage thereover presenting Venturi creating deflectors whereby fresh air is drawn into said blower scroll housing for mixture with the flow of recirculated room air.

2. In a room air conditioning unit, the combination comprising: a casing enclosing a condenser compartment and an evaporator compartment separated by a transverse partition, a first intake opening in a side wall of said casing and positioned for delivery of outside fresh air into said condenser compartment, said partition forming the outer vertical side wall of a centrifugal impeller scroll housing, said scroll housing having an inner side wall spaced therefrom including an air intake orifice therein for receiving a stream of recirculated room air drawn through said evaporator compartment for subsequent discharge from said scroll housing into the room, said centrifugal impeller comprising a blower wheel having its center of rotation eccentrically arranged within said scroll housing defining a vertical air exhaust passageway of widening spiral form, a second rectangular fresh air intake opening in said scroll housing outer side wall having a plurality of inwardly and upwardly inclined horizontally disposed louvers extending into said scroll housing air exhaust passage, a rectangular damper door pivotally disposed on the con denser compartment side of said scroll housing outer side wall closing said second fresh air intake opening, selective actuator means for moving said door between its closed position and an open position inclined outwardly at an angle of approximately 45 into the path of the inward flow of fresh air flow through said first intake opening, duct means supported on said partition in the form of an open-ended box-like channel having horizontal upper and lower walls and a vertical back wall overlying said second intake opening, said channel back wall spaced rearwardly of said second intake opening so as to be located in a plane parallel to the plane of said door in its closed position; the upstream edges of said upper, lower and back walls of said channel duct located in close proximity to said casing side wall so as to envelop a portion of said first intake opening, said door when in its opened position having its free vertical edge positioned contacting said channel duct back wall so as to form with said upper and lower walls a scoop-like elbow duct to direct a portion of the fresh air entering through said first intake opening to flow through said second opening, said upstream edge of said channel back wall having an outwardly directed air divider flange formed therein substantially parallel to said casing side wall to increase the amount of air flow into said channel duct when said door is in its opened position, said louvers cooperating with the upward flow of recirculated air in said scroll-housing exhaust passage thereover presenting Venturi creating deflectors whereby fresh air is drawn into said blower scroll housing for mixture with the flow of recirculated room air.

3. in a room air conditioning unit, the combination comprising: a casing enclosing a condenser compartment and an evaporator compartment separated by a transverse partition, 21 first fresh air intake opening in said casing positioned for delivery of outside air into said condenser compartment, a centrifugal impeller scroll housing in said evaporator compartment includ ing inner and outer side walls and including a vertically disposed air exhaust passage, an air inlet orifice in said scroll housing inner side wall concentric with said blower wheel communicating with said evaporator compartment for receiving a stream of recirculated air withdrawn from the room into said evaporator compartment for subsequent discharge into the room, a second rectangular fresh air intake opening in said scroll housing outer side wall communicating with said condenser compartment, said second intake opening having a plurality of horizontally extending parallel louvers angularly disposed directing the flow of fresh air upwardly into said blower scroll air exhaust passage, a rectangular damper door, means for pivotally support ing said door on said scroll housing outer side wall covering said second fresh air intake opening including a plurality of hinge fasteners comprising a U-shaped resilient clip portion which snaps over integrally molded rib members on said scroll housing outer side wall, each said hinge fastener having an elongate integral arm disposed at right angles to said clip, the outer end of said arm being bent to provide an inwardly curved finger extending into an elongated aperture in said door, said clip arm having a lanced tab bent outwardly therefrom providing stop means to limit the amount of insertion of said finger in said door aperture, selective actuator means for moving said door between its closed position and an open position inclined outwardly at an angle of approximately 45 into said condenser compartment in the path of the inward flow of fresh air through said first fresh air intake opening, duct means supported on said blower scroll outer side wall in the form of a threesided box-like channel having horizontal upper and lower walls and a vertical back wall overlying said second intake opening, said channel back wall spaced rearwardly of said second intake opening so as to be located in a plane parallel to the plane of said door in its closed position, the upstream edges of said upper, lower and back walls of said channel duct located in close proximity to said casing side wall presenting a minimum of obstruction to the incoming fresh air flow through said first intake opening when said door is in its closed position, said door when in its opened position having its vertical free edge contacting said channel back wall approximately midway between its upstream and downstream vertical edges so as to form with said upper and lower channel walls a scoop-like elbow duct causing a portion of the fresh air entering through said first intake opening to flow through said second opening into said scroll housing.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2472792 *Sep 17, 1945Jun 14, 1949Mitchell Mfg CompanyAir conditioning unit for mounting in windows
US2711088 *May 3, 1954Jun 21, 1955Servel IncAir conditioner
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3992897 *Sep 2, 1975Nov 23, 1976General Motors CorporationRoom air conditioner grounding clip
US4111000 *Jan 14, 1977Sep 5, 1978Hitachi, Ltd.Room air conditioner
US4129996 *Sep 19, 1977Dec 19, 1978General Electric CompanyVent system for a self-contained air conditioner
US4553405 *Dec 9, 1983Nov 19, 1985Carrier CorporationVent assembly for use with an air conditioning unit
US5295531 *Sep 2, 1992Mar 22, 1994Sanyo Electric Co., Ltd.Air conditioner with outside air introduction path
US5372189 *Jun 14, 1993Dec 13, 1994Sanyo Electric Co., Ltd.Air conditioner
US6276157 *Sep 16, 1998Aug 21, 2001Carrier CorporationAir exhaust actuator for an air conditioner
US6378320 *Apr 10, 2000Apr 30, 2002International Comfort Products, CorporationCondenser unit for air conditioner or heat pump
US7028506 *Oct 15, 2001Apr 18, 2006Lg Electronics Inc.Indoor unit of packaged air conditioner
US20110226443 *Mar 16, 2010Sep 22, 2011Moshe Michael SiegelFresh air ventilation package
EP0738857A2 *Feb 15, 1996Oct 23, 1996Fujitsu General LimitedAir conditioner
Classifications
U.S. Classification62/262, 62/427, 62/408
International ClassificationF24F1/02
Cooperative ClassificationF24F1/027
European ClassificationF24F1/02B3