Climate control unit

Details Climate control unit Climate control unit

1998-10-06

2001-04-17

Joyce, Harold (Department: 3744)

Ventilation

Vehicle

Having inlet airway

C055S467000, C055S467100, C055S471000, C454S139000, C454S161000

Reexamination Certificate

active

06217439

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a vehicle climate control unit comprising a fan arranged in a first opening in an operator cab wall of the vehicle, at least one main filter arranged to cover the first opening, and a first cover arranged over the at least one main filter and the first opening.
BACKGROUND OF THE INVENTION
Excavation vehicles, such as wheel loaders and dumpers often operate in dusty environments containing particles and substances which are harmful if inhaled. In order to prevent the dust from reaching the operator of the vehicle, the operator cab is provided with a dust filter through which ventilation air to the operator cab passes and is thus filtered.
For filtering out fine dust, a filter is required with a high degree of separation, which means that the filter structure will be close. Since the total amount of dust generated by the excavator is often great, the problem of the filter becoming quickly clogged will arise.
Filters used in excavators are therefore dimensioned with large surfaces to extend the time before the filter becomes clogged.
In order to prevent dust from penetrating through leaks into the cab, an overpressure is created therein. However, dust clings to the operator and accompanies him as he enters the cab. The dust which the operator brings with him will circulate inside the cab when the air in the cab is recirculated and cooled by an air conditioning system in the cab therein.
SUMMARY OF THE INVENTION
It is the purpose of the present invention to achieve a climate control unit of the type described by way of introduction which permits the total filter surface to be made smaller while retaining a long service interval between filter replacements.
Another purpose is to achieve a climate control unit where the amount of recirculated air and outside air can be regulated at the same time as both the recirculated air and the outside air are filtered.
An additional purpose is to achieve a service-friendly climate control unit.
Still another purpose is to achieve a climate control unit which permits rapid cooling and simultaneous filtering of the air in the cab.
Still another purpose is to achieve an air purification function to obtain a higher degree of particle separation at the breathing zone of the operator than the rated degree of separation of the filter.
This is achieved with the climate control unit according to the invention by virtue of the fact that the first cover comprises a first inlet opening, in which a prefilter is arranged.
Such a climate control unit allows the total filter surface to be reduced at the same time as the service intervals for replacement or cleaning of the filters are maintained. Inspection and service will be simplified due to the placement of the climate control unit on the outside of the cab.


REFERENCES:
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patent: 3722182 (1973-03-01), Gilbertson
patent: 4629479 (1986-12-01), Cantoni
patent: 5050487 (1991-09-01), Arold et al.
patent: 5119718 (1992-06-01), Wagner et al.
patent: 5342238 (1994-08-01), Segerpalm et al.
patent: 6110036 (2000-08-01), Queinnec
patent: 1 354 277 (1974-05-01), None
patent: 1 504 385 (1978-03-01), None
patent: 2 020 006 (1979-11-01), None
patent: 56-79011 (1981-06-01), None
patent: 56-79010 (1981-06-01), None

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