Bus rooftop condenser fan
A module is provided for attachment to the roof of a bus and includes all of the necessary components for conditioning the return air from the passenger compartment and delivering conditioned air thereto. Each module may include an evaporator section, a condenser section and a power section including a compressor and an inverter. The condenser section includes a condenser coil and a transverse fan with its axes disposed horizontally so as to draw air through a fresh air intake opening, through the coil and out a condenser discharge opening. The drain pan is shaped so as to form an air guiding wall around the fan, and a vortex wall is attached to the condenser coil support structure to separate low and high pressure sides of the fan. A rear wall and the fins of a discharge grill are angled with respect to the vertical plane so as to thereby prevent a recirculation of hot discharged air back into the air intake opening.
1. A bus rooftop air conditioner module comprising:
a housing;
an evaporator section disposed in said housing and having a fan for circulating return air from the passenger compartment of a bus, through an evaporator coil to a supply air duct and to the passenger compartment; and
a condenser section disposed in said housing and having a condenser coil with a fan for drawing outside air into an inlet opening on one side of a vertical plane and through said condenser coil and discharging it from a discharge opening on the other side of the vertical plane wherein said condenser fan is a tangential fan with its axis disposed horizontally and including a drain pan disposed below said condenser coil and said condenser fan, said drain pan being generally planer in form, but having a portion which is disposed under said fan and is curvilinear in form to act as an air guiding wall for the fan.
2. A bus rooftop air conditioner module as set forth in claim 1 and including a back wall that defines an outer boundary of the air flow stream from the high pressure side of the fan, said back wall being angled away from the vertical plane.
3. A bus rooftop air conditioner module as set forth in claim 1 and including a grill in the condenser discharge opening, said grill having a plurality of fins that are angled away from the vertical plane.
4. A bus rooftop air conditioner module as set forth in claim 1 and including a refrigeration circuit that includes said condensing coil and said evaporator coil, a compressor and an expansion valve.
5. A bus rooftop air conditioner module as set forth in claim 4 and including an inverter electrically connected to said compressor and to drive motors for said condenser and evaporator fans.
6. A bus rooftop air conditioner module as set forth in claim 1 wherein said module is adaptable to be mounted in tandem on the bustop with an identical module, with each extending transversely from a point near a longitudinal centerline of the bus to a point near its outer side.
7. An air conditioning module for installation on a bus having a supply air duct for conducting the flow of conditioned air to a passenger compartment and for conducting the flow of stale air from the passenger compartment, comprising:
a housing for selective placement on the bus and having a supply air outlet opening being disposed adjacent the supply air duct and a return air intake opening disposed adjacent the return air duct;
an evaporator coil disposed in said housing and having an associated fan for circulating return air from said return air intake opening, through said evaporator coil and outside supply air duct; and
a condenser coil disposed in said housing and having an associated fan for circulating fresh air from a condenser fresh air intake opening in said housing, through said condenser coil and out a condenser outlet air opening; wherein said associated fan is a transverse fan positioned adjacent said condenser air outlet opening including a drain pan located below said condenser coil and fan, said drain pan being substantially planer in form but having a curvilinear portion disposed under the fan to act as a guiding wall for the air flowing through said fan.
8. An air conditioning module as set forth in claim 7 wherein said condenser fresh air intake opening is adjacent said condenser outlet air opening with said openings being separated by a vertical plane therebetween and further wherein said housing includes a wall on a downstream side of said fan, with said wall being disposed at an angle from the vertical plane so as to facilitate the discharge flow at an angle from said vertical plane.
9. An air conditioning module as set forth in claim 8 and including a grill disposed in said condenser outlet air opening, said grill having a plurality of fins which are disposed at an angle with respect to a vertical plane to thereby facilitate the discharge of flow at an angle from the vertical plane.