Ventilation – Vehicle – Having forced recirculation
Patent
1994-03-07
1995-12-26
Look, Edward K.
Ventilation
Vehicle
Having forced recirculation
415 95, 415102, 415131, 415150, 415157, 416178, 416184, 416186A, 416187, B60H 126
Patent
active
054782759
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a radial fan, especially a fan which is used in cars for suction of fresh air and possibly at the same time recirculation and mixing of air being present in the car. It can also be used for the choice of or mixing of gas streams in other connections, for example in the ventilation system in buildings.
PRIOR ART
In all cars manufactured during the later decades there is an input opening for fresh air and a fan in connection therewith. The input openings of fresh air can be of different constructions and they can be located at different places in the car but it is at present usual that they consist of a bar protected opening in the plate in front of the front wind screen. This opening can at some older models be closed by means of a shutter which is operated from the inside of the car, the shutter in the open position acting as an air scope for the air. It is however usual that the air intake can not be closed in this way and the air channels are usually closed further in the car by means of valves or the like.
When a car having a bar protected fresh air intake of said kind is moved forward at different speeds the air pressure against the bar protected opening will change in dependence of the speed of the car and as a consequence thereof the amount of fresh air flowing into the car. The air stream is therefore as said above controlled by means of valves. At low speeds however the air stream will be too small which is the reason why a fan for suction of fresh air is necessary in the air intake system. This fan is also necessary because a part of the air which already is in the car shall be recirculated and optionally heated together with the newly supplied fresh air.
The same circumstances can also be present at buildings where the ventilation system can be influenced by different wind speeds and wind directions.
Different types of fans and valves for this purpose are known earlier. They may be simple or very complicated but a common feature with all these is that the air streams are controlled by means of different valve arrangements. The fan arrangement can also be moveable to bring about certain streaming effects. See for instance the Japanese patent application 58-168906.
TECHNICAL PROBLEM
The above mentioned fresh air arrangements for example cars can in many ways be regarded satisfactory but they have all the disadvantage that they are sensible to the speed with which the vehicle is driven forward in that the air pressure against the air intake is changed so that the streaming conditions in the whole fresh air system is influenced. This has the consequence that one must move the valves to different positions depending on the speed with which one drives the vehicle. This can also lead to the circulating air streaming in wrong direction. The valves are usually controlled from the driver position by means of moveable handles or at some more sophisticated arrangements in electronic ways.
It has therefore always been a desire that in a simple and cheap way be able to control the amount of fresh air streaming in and to bring about the correct mixing ratio between this and the air circulating in the car or in a building independent of the speed of the car or the wind and in such a way that any flow in wrong direction will not occur.
According to the present invention one has been able to solve the problems connected with earlier known arrangements and satisfy the wishes according to the above by bringing about a radial fan for for example cars comprising radially arranged fan plates having an axial extension for axial suction and radial blowing of a medium such as air which radial fan is characterized by the shaft arranged axially moveable and adaptable radially directed partition wall which extends outwardly at least to the plates and suction openings at either side of the partition wall.
It is according to the invention further suitable that the partition wall is slidably mounted on a shaft in the shape of an axially slotted pipe and that it via a proje
REFERENCES:
patent: 2537805 (1951-01-01), Wilken
patent: 2542121 (1951-02-01), Earl
patent: 2714485 (1955-08-01), Goettl
patent: 4244685 (1981-01-01), Lahtinen
patent: 4779672 (1988-10-01), Seikou et al.
patent: 4808068 (1989-02-01), Asbjornson et al.
patent: 5207557 (1993-05-01), Smiley, III et al.
AB Volvo
Look Edward K.
Verdier Christopher
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