# US 6,718,786 B1 · Coil housing design for a bus air conditioning unit

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- Number: US 6,718,786 B1
- Document ID: US6718786B1
- Status: Granted
- Kind: B1
- Application number: 10/429,454
- Filed: 2003-05-05
- Granted: 2004-04-13
- Earliest claimed: 2003-05-05
- Assignees: Carrier Corporation
- Inventors: Andreas Hille; Robert C. Reimann; Belin Czechowicz
- Web page: https://patentgrep.com/patent/US6718786B1

## CPC

- B60H 1/3233: {characterised by condensed liquid drainage means}
- B60H 1/00371: {for vehicles carrying large numbers of passengers, e.g. buses}
- B60H 1/3226: {Self-contained devices, i.e. including own drive motor}
- B60H 1/32331: {comprising means for the use of condensed liquid, e.g. for humidification or for improving condenser performance}
- B60H 2001/00235: {Devices in the roof area of the passenger compartment}
- F25D 21/14: Collecting or removing condensed and defrost water; Drip trays
- B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- F25D: REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR (refrigerated showcases A47F3/04; thermally-insulated vessels for domestic use A47J41/00; refrigerated vehicles, see the appropriate subclasses of classes B60 - B64; containers with thermal insulation in general B65D81/38; heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion C09K5/00; thermally-insulated vessels for liquefied or solidified gases F17C; air-conditioning or air-humidification F24F; refrigeration machines, plants, or systems F25B; cooling of instruments or comparable apparatus without refrigeration G12B)

## Abstract

A compact rooftop air conditioning unit for a vehicle, said unit having an evaporator coil located in front of a condenser coil. At least one cylindrical blower is mounted adjacent the evaporator coil and is arranged to provide conditioned the blower and a condensate pump is secured to the shaft for pumping condensate generated by the evaporator coil back over the condenser coil. An electrically driven compressor is housed within the unit and is arranged so that no refrigerant lines pass outside of the unit. An inverter is also housed within the unit and provides a regulated input to the compressor and the blower drive motor. The heat exchanger coils are mounted in the form of two tube sheets take over the function of a housing, with the drip pan closing the bottom and the unit lid closing the top to form the completed unit.

## Claims

### Claim 1

A compact roof top air conditioning unit for a vehicle, said unit having an evaporator coil mounted in front of a condenser coil integral with and in the form of two tube sheets which function in place of a housing side wall, wherein said unit further includes:
at least one cylindrical blower mounted upon a horizontally disposed shaft for moving return air from a conditioned region inside said vehicle over the evaporate coil;
an electrical drive motor for turning said shaft;
a pump means secured to said shaft for pumping condensate generated by the evaporator coil over the surface of the condenser coil; and
a drip pan mounted beneath the evaporator coil which closes said unit from the bottom, said drip pan having a trough for conducing condensate away from the evaporator coil; and a unit lid which closes said unit from the top.

### Claim 2

A compact rooftop air conditioning unit for a vehicle, said unit having an evaporator coil mounted in front of a condenser coil in the form of two tubes sheets which function in place of a housing side wall, wherein said unit further includes:
an electrical compressor for moving refrigerant between said coils;
at least one cylindrical blower mounted upon a horizontally disposed shaft for moving return air from inside the vehicle through the evaporator coil;
an electrical drive means for turning said shaft;
an inverter for controlling the electrical input to said compressor and said drive means;
a pump means secured to said shaft for pumping condensate generated by the evaporator coil over the surface of the condenser coil;
a drip pan mounted beneath the evaporator coil which closes said unit from the bottom; and
a unit lid which closes said unit from the top.