초록 ▼

An independent mixing valve sub-assembly which includes a casing defining a cold bias inlet, a hot bias inlet and a second zone inlet and a mechanism for mechanically attaching the casing to the housing of a HVAC module with the cold bias inlet, the hot bias inlet and the second zone inlet of the mi

An independent mixing valve sub-assembly which includes a casing defining a cold bias inlet, a hot bias inlet and a second zone inlet and a mechanism for mechanically attaching the casing to the housing of a HVAC module with the cold bias inlet, the hot bias inlet and the second zone inlet of the mixing valve sub-assembly in sealing engagement with a cold bias outlet, a hot bias outlet, and a second zone outlet of a HVAC module, respectively. The mixing valve sub-assembly may provide one or more streams of temperature-controlled air. Accordingly, different mixing valve sub-assemblies may be attached to one universal HVAC module to provide varying numbers of temperature zones.

대표청구항 ▼

What is claimed is: 1. An HVAC unit comprising; a housing defining a primary inlet, a mixing chamber, a first zone outlet, and a second zone outlet, wherein said housing conveys airflow from said primary inlet to said first and second zone outlets, an evaporator supported by said housing downstream

What is claimed is: 1. An HVAC unit comprising; a housing defining a primary inlet, a mixing chamber, a first zone outlet, and a second zone outlet, wherein said housing conveys airflow from said primary inlet to said first and second zone outlets, an evaporator supported by said housing downstream of said primary inlet for cooling air being from said primary inlet, a heater core supported by said housing in said heater air path downstream of said evaporator for heating cool air delivered from said evaporator, a zone valve for apportioning airflow from said mixing chamber between said first zone outlet and said second zone outlet, said housing defining a cold bias outlet downstream of said evaporator for bleeding cool air from said evaporator, said housing defining a hot bias outlet downstream of said heater core for bleeding hot air from said heater core, and a mixing valve sub-assembly comprising a casing defining: (i) a cold bias inlet and a hot bias inlet and a second zone inlet, and means for attaching said casing with said cold bias inlet in sealing engagement with said cold bias outlet and with said hot bias inlet in sealing engagement with said hot bias outlet and with said second zone inlet in sealing engagement with said second zone outlet, (ii) a proportioning chamber having a cylindrical wall and circular end walls downstream of said cold bias inlet and said hot bias inlet and said second zone inlet for receiving and mixing air from said cold bias inlet and said hot bias inlet and said second zone inlet and producing a stream of mixed air having a predetermined temperature independent of the temperature of the air exiting said first zone outlet, (iii) a third zone aperture in said cylindrical wall for directing mixed air out of said casing, and (iv) a cold bias conduit for conveying air from said cold bias inlet to said proportioning chamber and a hot bias conduit for conveying air from said hot bias inlet to said proportioning chamber and a second zone conduit for conveying air from said second zone inlet to said proportioning chamber, wherein said hot bias conduit terminates in a hot bias aperture in said cylindrical wall, said cold bias conduit is forked to extend around said hot bias conduit and terminates in a cold bias aperture in each of said circular end walls, and said second zone conduit terminates in a second zone aperture in said cylindrical wall, and wherein said hot bias aperture is substantially diametrically opposite to said third zone aperture and said second zone aperture is disposed substantially at a right angle to said diametrically opposite hot bias and third zone aperture; and a mixing valve disposed in said proportioning chamber for producing said stream of mixed air. 2. An assembly as set forth in claim 1 wherein said mixing valve includes a hub rotatably supported by and centrally of each of said circular end walls. 3. An assembly as set forth in claim 2 wherein said mixing valve includes a sector plate adjacent each circular end wall and extends between radial edges from said hub to a circular outer periphery extending between said radial edges for rotation between a closed position covering said respective cold bias apertures and an open position opening said respective cold bias apertures. 4. An assembly as set forth in claim 3 wherein said mixing valve includes a first curved plate concentric with said cylindrical wall and extending circumferentially from one of said radial edges of said sector plates for controlling flow through said hot bias aperture. 5. An assembly as set forth in claim 4 wherein said mixing valve includes a second curved plate concentric with said cylindrical wall and extending circumferentially along said outer peripheries of said sector plates for controlling flow out of said third zone aperture. 6. An assembly as set forth in claim 5 including an actuator connected to said hub for rotating said hub and said sector plate and said first curved plate and said second curved plate for controlling flow into and out of said proportioning chamber. 7. An independent mixing valve sub-assembly for attachment to an HVAC housing that defines a cold bias outlet and a hot bias outlet and a first zone outlet and a second zone outlet, said sub-assembly comprising; a casing defining: (i) a cold bias inlet and a hot bias inlet and a second zone inlet, (ii) a proportioning chamber downstream of said cold bias inlet and said hot bias inlet and said second zone inlet for receiving and mixing air from said cold bias inlet and said hot bias inlet and said second zone inlet and producing a stream of mixed air having a predetermined temperature independent of the temperature of the air exiting the first zone outlet, (iii) a cold bias conduit for conveying air from said cold bias inlet to said proportioning chamber and a hot bias conduit for conveying air from said hot bias inlet to said proportioning chamber and a second zone conduit for conveying air from said second zone inlet to said proportioning chamber; and (iii) a mechanism for mechanically attaching said casing with said cold bias inlet in sealing engagement with the cold bias outlet and with said hot bias inlet in sealing engagement with the hot bias outlet and with said second zone inlet in sealing engagement with the second zone outlet; and a mixing valve disposed in said proportioning chamber for producing said stream of mixed air having a predetermined temperature independent of the temperature of the air exiting the first zone outlet; wherein said proportioning chamber is defined by a cylindrical wall and circular end walls and said hot bias conduit terminates in a hot bias aperture in said cylindrical wall, and wherein said cold bias conduit is forked to extend around said hot bias conduit and terminates in a cold bias aperture in each of said circular end walls. 8. An assembly as set forth in claim 7 wherein said second zone conduit terminates in a second zone aperture in said cylindrical wall. 9. An assembly as set forth in claim 8 wherein said casing defines a third zone aperture in said cylindrical wall for directing mixed air out of said casing. 10. An assembly as set forth in claim 9 wherein said hot bias aperture is substantially diametrically opposite to said third zone aperture and said second zone aperture is disposed substantially at a right angle to said diametrically opposite hot bias aperture and third zone aperture. 11. An assembly as set forth in claim 10 wherein said mixing valve includes a hub rotatably supported by and centrally of each of said circular end walls. 12. An assembly as set forth in claim 11 wherein said mixing valve includes a sector plate adjacent each circular end wall and extends between radial edges from said hub to a circular outer periphery extending between said radial edges for rotation between a closed position covering said respective cold bias apertures and an open position opening said respective cold bias apertures. 13. An assembly as set forth in claim 12 wherein said mixing valve includes a first curved plate concentric with said cylindrical wall and extending circumferentially from one of said radial edges of said sector plates for controlling flow through said hot bias aperture. 14. An assembly as set forth in claim 13 wherein said mixing valve includes a second curved plate concentric with said cylindrical wall and extending circumferentially along said outer peripheries of said sector plates for controlling flow out of said third zone aperture. 15. An assembly as set forth in claim 14 including an actuator connected to said hub for rotating said hub and said sector plate and said first curved plate and said second curved plate for controlling flow into and out of said proportioning chamber. 16. A mixing valve sub-assembly adapted to engage an HVAC housing that has a cold bias outlet, a hot bias outlet, a first zone outlet, and a second zone outlet, wherein said mixing valve sub-assembly comprises: a casing defining: a cold bias inlet, a hot bias inlet, and a second zone inlet adapted to sealingly engaged to said cold bias outlet, hot bias outlet, and said second zone outlet of said HVAC housing, respectively; a proportioning chamber having a cylindrical wall and circular end walls; a cold bias conduit for conveying air from said cold bias inlet to said proportioning chamber; a hot bias conduit for conveying air from said hot bias inlet to said proportioning chamber; and a second zone conduit for conveying air from said second zone inlet to said proportioning chamber; wherein said hot bias conduit terminates in a hot bias aperture in said cylindrical wall, said cold bias conduit is forked to extend around said hot bias conduit and terminates in a cold bias aperture in each of said circular end walls, said second zone conduit terminates in a second zone aperture in said cylindrical wall said, wherein said casing further defines a third zone aperture in said cylindrical wall for directing mixed air out of said casing, said hot bias aperture is substantially diametrically opposite to said third zone aperture and said second zone aperture is disposed substantially at a right angle to said diametrically opposite hot bias aperture and third zone aperture; and a mixing valve disposed in said proportioning chamber for producing said stream of mixed air having a predetermined temperature independent of the temperature of the air exiting the first zone outlet. 17. An mixing valve sub-assembly of claim 16 wherein said mixing valve comprises: a hub rotatably supported by and centrally of each of said circular end walls; a sector plate adjacent each circular end wall and extends between radial edges from said hub to a circular outer periphery extending between said radial edges for rotation between a closed position covering said respective cold bias apertures and an open position opening said respective cold bias apertures; and a first curved plate concentric with said cylindrical wall and extending circumferentially from one of said radial edges of said sector plates for controlling flow through said hot bias aperture. 18. An independent mixing valve sub-assembly of claim 17 wherein said mixing valve includes a second curved plate concentric with said cylindrical wall and extending circumferentially along said outer peripheries of said sector plates for controlling flow out of said third zone aperture. 19. An independent mixing valve sub-assembly of claim 18 including an actuator connected to said hub for rotating said hub and said sector plate and said first curved plate and said second curved plate for controlling flow into and out of said proportioning chamber.